mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
4616 lines
150 KiB
C++
4616 lines
150 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
|
|
* vim: set ts=8 sts=4 et sw=4 tw=99:
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/*
|
|
* JS script operations.
|
|
*/
|
|
|
|
#include "jsscriptinlines.h"
|
|
|
|
#include "mozilla/DebugOnly.h"
|
|
#include "mozilla/MathAlgorithms.h"
|
|
#include "mozilla/MemoryReporting.h"
|
|
#include "mozilla/PodOperations.h"
|
|
#include "mozilla/ScopeExit.h"
|
|
#include "mozilla/Vector.h"
|
|
|
|
#include <algorithm>
|
|
#include <string.h>
|
|
|
|
#include "jsapi.h"
|
|
#include "jsatom.h"
|
|
#include "jscntxt.h"
|
|
#include "jsfun.h"
|
|
#include "jsgc.h"
|
|
#include "jsobj.h"
|
|
#include "jsopcode.h"
|
|
#include "jsprf.h"
|
|
#include "jstypes.h"
|
|
#include "jsutil.h"
|
|
#include "jswrapper.h"
|
|
|
|
#include "frontend/BytecodeCompiler.h"
|
|
#include "frontend/BytecodeEmitter.h"
|
|
#include "frontend/SharedContext.h"
|
|
#include "gc/Marking.h"
|
|
#include "jit/BaselineJIT.h"
|
|
#include "jit/Ion.h"
|
|
#include "jit/IonCode.h"
|
|
#include "js/MemoryMetrics.h"
|
|
#include "js/Utility.h"
|
|
#include "vm/ArgumentsObject.h"
|
|
#include "vm/Compression.h"
|
|
#include "vm/Debugger.h"
|
|
#include "vm/Opcodes.h"
|
|
#include "vm/SelfHosting.h"
|
|
#include "vm/Shape.h"
|
|
#include "vm/Xdr.h"
|
|
|
|
#include "jsfuninlines.h"
|
|
#include "jsobjinlines.h"
|
|
|
|
#include "vm/ScopeObject-inl.h"
|
|
#include "vm/Stack-inl.h"
|
|
|
|
using namespace js;
|
|
using namespace js::gc;
|
|
using namespace js::frontend;
|
|
|
|
using mozilla::PodCopy;
|
|
using mozilla::PodZero;
|
|
using mozilla::RotateLeft;
|
|
|
|
static BindingIter
|
|
GetBinding(HandleScript script, HandlePropertyName name)
|
|
{
|
|
BindingIter bi(script);
|
|
while (bi->name() != name)
|
|
bi++;
|
|
return bi;
|
|
}
|
|
|
|
/* static */ BindingIter
|
|
Bindings::argumentsBinding(ExclusiveContext* cx, HandleScript script)
|
|
{
|
|
return GetBinding(script, cx->names().arguments);
|
|
}
|
|
|
|
/* static */ BindingIter
|
|
Bindings::thisBinding(ExclusiveContext* cx, HandleScript script)
|
|
{
|
|
return GetBinding(script, cx->names().dotThis);
|
|
}
|
|
|
|
bool
|
|
Bindings::initWithTemporaryStorage(ExclusiveContext* cx, MutableHandle<Bindings> self,
|
|
uint32_t numArgs, uint32_t numVars,
|
|
uint32_t numBodyLevelLexicals, uint32_t numBlockScoped,
|
|
uint32_t numUnaliasedVars, uint32_t numUnaliasedBodyLevelLexicals,
|
|
const Binding* bindingArray, bool isModule /* = false */)
|
|
{
|
|
MOZ_ASSERT(!self.callObjShape());
|
|
MOZ_ASSERT(self.bindingArrayUsingTemporaryStorage());
|
|
MOZ_ASSERT(!self.bindingArray());
|
|
MOZ_ASSERT(!(uintptr_t(bindingArray) & TEMPORARY_STORAGE_BIT));
|
|
MOZ_ASSERT(numArgs <= ARGC_LIMIT);
|
|
MOZ_ASSERT(numVars <= LOCALNO_LIMIT);
|
|
MOZ_ASSERT(numBlockScoped <= LOCALNO_LIMIT);
|
|
MOZ_ASSERT(numBodyLevelLexicals <= LOCALNO_LIMIT);
|
|
mozilla::DebugOnly<uint64_t> totalSlots = uint64_t(numVars) +
|
|
uint64_t(numBodyLevelLexicals) +
|
|
uint64_t(numBlockScoped);
|
|
MOZ_ASSERT(totalSlots <= LOCALNO_LIMIT);
|
|
MOZ_ASSERT(UINT32_MAX - numArgs >= totalSlots);
|
|
|
|
MOZ_ASSERT(numUnaliasedVars <= numVars);
|
|
MOZ_ASSERT(numUnaliasedBodyLevelLexicals <= numBodyLevelLexicals);
|
|
|
|
self.setBindingArray(bindingArray, TEMPORARY_STORAGE_BIT);
|
|
self.setNumArgs(numArgs);
|
|
self.setNumVars(numVars);
|
|
self.setNumBodyLevelLexicals(numBodyLevelLexicals);
|
|
self.setNumBlockScoped(numBlockScoped);
|
|
self.setNumUnaliasedVars(numUnaliasedVars);
|
|
self.setNumUnaliasedBodyLevelLexicals(numUnaliasedBodyLevelLexicals);
|
|
|
|
// Get the initial shape to use when creating CallObjects for this script.
|
|
// After creation, a CallObject's shape may change completely (via direct eval() or
|
|
// other operations that mutate the lexical scope). However, since the
|
|
// lexical bindings added to the initial shape are permanent and the
|
|
// allocKind/nfixed of a CallObject cannot change, one may assume that the
|
|
// slot location (whether in the fixed or dynamic slots) of a variable is
|
|
// the same as in the initial shape. (This is assumed by the interpreter and
|
|
// JITs when interpreting/compiling aliasedvar ops.)
|
|
|
|
// Since unaliased variables are, by definition, only accessed by local
|
|
// operations and never through the scope chain, only give shapes to
|
|
// aliased variables. While the debugger may observe any scope object at
|
|
// any time, such accesses are mediated by DebugScopeProxy (see
|
|
// DebugScopeProxy::handleUnaliasedAccess).
|
|
uint32_t nslots = CallObject::RESERVED_SLOTS;
|
|
uint32_t aliasedBodyLevelLexicalBegin = UINT16_MAX;
|
|
for (BindingIter bi(self); bi; bi++) {
|
|
if (bi->aliased()) {
|
|
// Per ES6, lexical bindings cannot be accessed until
|
|
// initialized. Remember the first aliased slot that is a
|
|
// body-level lexical, so that they may be initialized to sentinel
|
|
// magic values.
|
|
if (numBodyLevelLexicals > 0 &&
|
|
nslots < aliasedBodyLevelLexicalBegin &&
|
|
bi.isBodyLevelLexical() &&
|
|
bi.localIndex() >= numVars)
|
|
{
|
|
aliasedBodyLevelLexicalBegin = nslots;
|
|
}
|
|
|
|
nslots++;
|
|
}
|
|
}
|
|
self.setAliasedBodyLevelLexicalBegin(aliasedBodyLevelLexicalBegin);
|
|
|
|
// Put as many of nslots inline into the object header as possible.
|
|
uint32_t nfixed = gc::GetGCKindSlots(gc::GetGCObjectKind(nslots));
|
|
|
|
// Start with the empty shape and then append one shape per aliased binding.
|
|
const Class* cls = isModule ? &ModuleEnvironmentObject::class_ : &CallObject::class_;
|
|
uint32_t baseShapeFlags = BaseShape::QUALIFIED_VAROBJ | BaseShape::DELEGATE;
|
|
if (isModule)
|
|
baseShapeFlags |= BaseShape::NOT_EXTENSIBLE; // Module code is always strict.
|
|
RootedShape shape(cx,
|
|
EmptyShape::getInitialShape(cx, cls, TaggedProto(nullptr), nfixed, baseShapeFlags));
|
|
if (!shape)
|
|
return false;
|
|
|
|
#ifdef DEBUG
|
|
HashSet<PropertyName*> added(cx);
|
|
if (!added.init()) {
|
|
ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
uint32_t slot = CallObject::RESERVED_SLOTS;
|
|
for (BindingIter bi(self); bi; bi++) {
|
|
if (!bi->aliased())
|
|
continue;
|
|
|
|
#ifdef DEBUG
|
|
// The caller ensures no duplicate aliased names.
|
|
MOZ_ASSERT(!added.has(bi->name()));
|
|
if (!added.put(bi->name())) {
|
|
ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
StackBaseShape stackBase(cx, cls, baseShapeFlags);
|
|
UnownedBaseShape* base = BaseShape::getUnowned(cx, stackBase);
|
|
if (!base)
|
|
return false;
|
|
|
|
unsigned attrs = JSPROP_PERMANENT |
|
|
JSPROP_ENUMERATE |
|
|
(bi->kind() == Binding::CONSTANT ? JSPROP_READONLY : 0);
|
|
Rooted<StackShape> child(cx, StackShape(base, NameToId(bi->name()), slot, attrs, 0));
|
|
|
|
shape = cx->compartment()->propertyTree.getChild(cx, shape, child);
|
|
if (!shape)
|
|
return false;
|
|
|
|
MOZ_ASSERT(slot < nslots);
|
|
slot++;
|
|
}
|
|
MOZ_ASSERT(slot == nslots);
|
|
|
|
MOZ_ASSERT(!shape->inDictionary());
|
|
self.setCallObjShape(shape);
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
Bindings::initTrivial(ExclusiveContext* cx)
|
|
{
|
|
Shape* shape = EmptyShape::getInitialShape(cx, &CallObject::class_, TaggedProto(nullptr),
|
|
CallObject::RESERVED_SLOTS,
|
|
BaseShape::QUALIFIED_VAROBJ | BaseShape::DELEGATE);
|
|
if (!shape)
|
|
return false;
|
|
callObjShape_.init(shape);
|
|
return true;
|
|
}
|
|
|
|
uint8_t*
|
|
Bindings::switchToScriptStorage(Binding* newBindingArray)
|
|
{
|
|
MOZ_ASSERT(bindingArrayUsingTemporaryStorage());
|
|
MOZ_ASSERT(!(uintptr_t(newBindingArray) & TEMPORARY_STORAGE_BIT));
|
|
|
|
if (count() > 0)
|
|
PodCopy(newBindingArray, bindingArray(), count());
|
|
bindingArrayAndFlag_ = uintptr_t(newBindingArray);
|
|
return reinterpret_cast<uint8_t*>(newBindingArray + count());
|
|
}
|
|
|
|
/* static */ bool
|
|
Bindings::clone(JSContext* cx, MutableHandle<Bindings> self,
|
|
uint8_t* dstScriptData, HandleScript srcScript)
|
|
{
|
|
/* The clone has the same bindingArray_ offset as 'src'. */
|
|
Handle<Bindings> src = Handle<Bindings>::fromMarkedLocation(&srcScript->bindings);
|
|
ptrdiff_t off = (uint8_t*)src.bindingArray() - srcScript->data;
|
|
MOZ_ASSERT(off >= 0);
|
|
MOZ_ASSERT(size_t(off) <= srcScript->dataSize());
|
|
Binding* dstPackedBindings = (Binding*)(dstScriptData + off);
|
|
|
|
/*
|
|
* Since atoms are shareable throughout the runtime, we can simply copy
|
|
* the source's bindingArray directly.
|
|
*/
|
|
if (!initWithTemporaryStorage(cx, self, src.numArgs(), src.numVars(),
|
|
src.numBodyLevelLexicals(),
|
|
src.numBlockScoped(),
|
|
src.numUnaliasedVars(),
|
|
src.numUnaliasedBodyLevelLexicals(),
|
|
src.bindingArray()))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
self.switchToScriptStorage(dstPackedBindings);
|
|
return true;
|
|
}
|
|
|
|
template<XDRMode mode>
|
|
static bool
|
|
XDRScriptBindings(XDRState<mode>* xdr, LifoAllocScope& las, uint16_t numArgs, uint32_t numVars,
|
|
uint16_t numBodyLevelLexicals, uint16_t numBlockScoped,
|
|
uint32_t numUnaliasedVars, uint16_t numUnaliasedBodyLevelLexicals,
|
|
HandleScript script)
|
|
{
|
|
JSContext* cx = xdr->cx();
|
|
|
|
if (mode == XDR_ENCODE) {
|
|
for (BindingIter bi(script); bi; bi++) {
|
|
RootedAtom atom(cx, bi->name());
|
|
if (!XDRAtom(xdr, &atom))
|
|
return false;
|
|
}
|
|
|
|
for (BindingIter bi(script); bi; bi++) {
|
|
uint8_t u8 = (uint8_t(bi->kind()) << 1) | uint8_t(bi->aliased());
|
|
if (!xdr->codeUint8(&u8))
|
|
return false;
|
|
}
|
|
} else {
|
|
uint32_t nameCount = numArgs + numVars + numBodyLevelLexicals;
|
|
|
|
AutoValueVector atoms(cx);
|
|
if (!atoms.resize(nameCount))
|
|
return false;
|
|
for (uint32_t i = 0; i < nameCount; i++) {
|
|
RootedAtom atom(cx);
|
|
if (!XDRAtom(xdr, &atom))
|
|
return false;
|
|
atoms[i].setString(atom);
|
|
}
|
|
|
|
Binding* bindingArray = las.alloc().newArrayUninitialized<Binding>(nameCount);
|
|
if (!bindingArray)
|
|
return false;
|
|
for (uint32_t i = 0; i < nameCount; i++) {
|
|
uint8_t u8;
|
|
if (!xdr->codeUint8(&u8))
|
|
return false;
|
|
|
|
PropertyName* name = atoms[i].toString()->asAtom().asPropertyName();
|
|
Binding::Kind kind = Binding::Kind(u8 >> 1);
|
|
bool aliased = bool(u8 & 1);
|
|
|
|
bindingArray[i] = Binding(name, kind, aliased);
|
|
}
|
|
|
|
Rooted<Bindings> bindings(cx, script->bindings);
|
|
if (!Bindings::initWithTemporaryStorage(cx, &bindings, numArgs, numVars,
|
|
numBodyLevelLexicals, numBlockScoped,
|
|
numUnaliasedVars, numUnaliasedBodyLevelLexicals,
|
|
bindingArray))
|
|
{
|
|
return false;
|
|
}
|
|
script->bindings = bindings;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
Bindings::bindingIsAliased(uint32_t bindingIndex)
|
|
{
|
|
MOZ_ASSERT(bindingIndex < count());
|
|
return bindingArray()[bindingIndex].aliased();
|
|
}
|
|
|
|
void
|
|
Binding::trace(JSTracer* trc)
|
|
{
|
|
PropertyName* name = this->name();
|
|
TraceManuallyBarrieredEdge(trc, &name, "binding");
|
|
}
|
|
|
|
void
|
|
Bindings::trace(JSTracer* trc)
|
|
{
|
|
if (callObjShape_)
|
|
TraceEdge(trc, &callObjShape_, "callObjShape");
|
|
|
|
/*
|
|
* As the comment in Bindings explains, bindingsArray may point into freed
|
|
* storage when bindingArrayUsingTemporaryStorage so we don't mark it.
|
|
* Note: during compilation, atoms are already kept alive by gcKeepAtoms.
|
|
*/
|
|
if (bindingArrayUsingTemporaryStorage())
|
|
return;
|
|
|
|
for (Binding& b : *this)
|
|
b.trace(trc);
|
|
}
|
|
|
|
template<XDRMode mode>
|
|
bool
|
|
js::XDRScriptConst(XDRState<mode>* xdr, MutableHandleValue vp)
|
|
{
|
|
JSContext* cx = xdr->cx();
|
|
|
|
/*
|
|
* A script constant can be an arbitrary primitive value as they are used
|
|
* to implement JSOP_LOOKUPSWITCH. But they cannot be objects, see
|
|
* bug 407186.
|
|
*/
|
|
enum ConstTag {
|
|
SCRIPT_INT = 0,
|
|
SCRIPT_DOUBLE = 1,
|
|
SCRIPT_ATOM = 2,
|
|
SCRIPT_TRUE = 3,
|
|
SCRIPT_FALSE = 4,
|
|
SCRIPT_NULL = 5,
|
|
SCRIPT_OBJECT = 6,
|
|
SCRIPT_VOID = 7,
|
|
SCRIPT_HOLE = 8
|
|
};
|
|
|
|
uint32_t tag;
|
|
if (mode == XDR_ENCODE) {
|
|
if (vp.isInt32()) {
|
|
tag = SCRIPT_INT;
|
|
} else if (vp.isDouble()) {
|
|
tag = SCRIPT_DOUBLE;
|
|
} else if (vp.isString()) {
|
|
tag = SCRIPT_ATOM;
|
|
} else if (vp.isTrue()) {
|
|
tag = SCRIPT_TRUE;
|
|
} else if (vp.isFalse()) {
|
|
tag = SCRIPT_FALSE;
|
|
} else if (vp.isNull()) {
|
|
tag = SCRIPT_NULL;
|
|
} else if (vp.isObject()) {
|
|
tag = SCRIPT_OBJECT;
|
|
} else if (vp.isMagic(JS_ELEMENTS_HOLE)) {
|
|
tag = SCRIPT_HOLE;
|
|
} else {
|
|
MOZ_ASSERT(vp.isUndefined());
|
|
tag = SCRIPT_VOID;
|
|
}
|
|
}
|
|
|
|
if (!xdr->codeUint32(&tag))
|
|
return false;
|
|
|
|
switch (tag) {
|
|
case SCRIPT_INT: {
|
|
uint32_t i;
|
|
if (mode == XDR_ENCODE)
|
|
i = uint32_t(vp.toInt32());
|
|
if (!xdr->codeUint32(&i))
|
|
return false;
|
|
if (mode == XDR_DECODE)
|
|
vp.set(Int32Value(int32_t(i)));
|
|
break;
|
|
}
|
|
case SCRIPT_DOUBLE: {
|
|
double d;
|
|
if (mode == XDR_ENCODE)
|
|
d = vp.toDouble();
|
|
if (!xdr->codeDouble(&d))
|
|
return false;
|
|
if (mode == XDR_DECODE)
|
|
vp.set(DoubleValue(d));
|
|
break;
|
|
}
|
|
case SCRIPT_ATOM: {
|
|
RootedAtom atom(cx);
|
|
if (mode == XDR_ENCODE)
|
|
atom = &vp.toString()->asAtom();
|
|
if (!XDRAtom(xdr, &atom))
|
|
return false;
|
|
if (mode == XDR_DECODE)
|
|
vp.set(StringValue(atom));
|
|
break;
|
|
}
|
|
case SCRIPT_TRUE:
|
|
if (mode == XDR_DECODE)
|
|
vp.set(BooleanValue(true));
|
|
break;
|
|
case SCRIPT_FALSE:
|
|
if (mode == XDR_DECODE)
|
|
vp.set(BooleanValue(false));
|
|
break;
|
|
case SCRIPT_NULL:
|
|
if (mode == XDR_DECODE)
|
|
vp.set(NullValue());
|
|
break;
|
|
case SCRIPT_OBJECT: {
|
|
RootedObject obj(cx);
|
|
if (mode == XDR_ENCODE)
|
|
obj = &vp.toObject();
|
|
|
|
if (!XDRObjectLiteral(xdr, &obj))
|
|
return false;
|
|
|
|
if (mode == XDR_DECODE)
|
|
vp.setObject(*obj);
|
|
break;
|
|
}
|
|
case SCRIPT_VOID:
|
|
if (mode == XDR_DECODE)
|
|
vp.set(UndefinedValue());
|
|
break;
|
|
case SCRIPT_HOLE:
|
|
if (mode == XDR_DECODE)
|
|
vp.setMagic(JS_ELEMENTS_HOLE);
|
|
break;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
template bool
|
|
js::XDRScriptConst(XDRState<XDR_ENCODE>*, MutableHandleValue);
|
|
|
|
template bool
|
|
js::XDRScriptConst(XDRState<XDR_DECODE>*, MutableHandleValue);
|
|
|
|
// Code LazyScript's free variables.
|
|
template<XDRMode mode>
|
|
static bool
|
|
XDRLazyFreeVariables(XDRState<mode>* xdr, MutableHandle<LazyScript*> lazy)
|
|
{
|
|
JSContext* cx = xdr->cx();
|
|
RootedAtom atom(cx);
|
|
uint8_t isHoistedUse;
|
|
LazyScript::FreeVariable* freeVariables = lazy->freeVariables();
|
|
size_t numFreeVariables = lazy->numFreeVariables();
|
|
for (size_t i = 0; i < numFreeVariables; i++) {
|
|
if (mode == XDR_ENCODE) {
|
|
atom = freeVariables[i].atom();
|
|
isHoistedUse = freeVariables[i].isHoistedUse();
|
|
}
|
|
|
|
if (!XDRAtom(xdr, &atom))
|
|
return false;
|
|
if (!xdr->codeUint8(&isHoistedUse))
|
|
return false;
|
|
|
|
if (mode == XDR_DECODE) {
|
|
freeVariables[i] = LazyScript::FreeVariable(atom);
|
|
if (isHoistedUse)
|
|
freeVariables[i].setIsHoistedUse();
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// Code the missing part needed to re-create a LazyScript from a JSScript.
|
|
template<XDRMode mode>
|
|
static bool
|
|
XDRRelazificationInfo(XDRState<mode>* xdr, HandleFunction fun, HandleScript script,
|
|
HandleObject enclosingScope, MutableHandle<LazyScript*> lazy)
|
|
{
|
|
MOZ_ASSERT_IF(mode == XDR_ENCODE, script->isRelazifiable() && script->maybeLazyScript());
|
|
MOZ_ASSERT_IF(mode == XDR_ENCODE, !lazy->numInnerFunctions());
|
|
|
|
JSContext* cx = xdr->cx();
|
|
|
|
uint64_t packedFields;
|
|
{
|
|
uint32_t begin = script->sourceStart();
|
|
uint32_t end = script->sourceEnd();
|
|
uint32_t lineno = script->lineno();
|
|
uint32_t column = script->column();
|
|
|
|
if (mode == XDR_ENCODE) {
|
|
packedFields = lazy->packedFields();
|
|
MOZ_ASSERT(begin == lazy->begin());
|
|
MOZ_ASSERT(end == lazy->end());
|
|
MOZ_ASSERT(lineno == lazy->lineno());
|
|
MOZ_ASSERT(column == lazy->column());
|
|
// We can assert we have no inner functions because we don't
|
|
// relazify scripts with inner functions. See
|
|
// JSFunction::createScriptForLazilyInterpretedFunction.
|
|
MOZ_ASSERT(lazy->numInnerFunctions() == 0);
|
|
}
|
|
|
|
if (!xdr->codeUint64(&packedFields))
|
|
return false;
|
|
|
|
if (mode == XDR_DECODE) {
|
|
lazy.set(LazyScript::Create(cx, fun, script, enclosingScope, script,
|
|
packedFields, begin, end, lineno, column));
|
|
|
|
// As opposed to XDRLazyScript, we need to restore the runtime bits
|
|
// of the script, as we are trying to match the fact this function
|
|
// has already been parsed and that it would need to be re-lazified.
|
|
lazy->initRuntimeFields(packedFields);
|
|
}
|
|
}
|
|
|
|
// Code free variables.
|
|
if (!XDRLazyFreeVariables(xdr, lazy))
|
|
return false;
|
|
|
|
// No need to do anything with inner functions, since we asserted we don't
|
|
// have any.
|
|
|
|
return true;
|
|
}
|
|
|
|
static inline uint32_t
|
|
FindScopeObjectIndex(JSScript* script, NestedStaticScope& scope)
|
|
{
|
|
ObjectArray* objects = script->objects();
|
|
HeapPtrObject* vector = objects->vector;
|
|
unsigned length = objects->length;
|
|
for (unsigned i = 0; i < length; ++i) {
|
|
if (vector[i] == &scope)
|
|
return i;
|
|
}
|
|
|
|
MOZ_CRASH("Scope not found");
|
|
}
|
|
|
|
static bool
|
|
SaveSharedScriptData(ExclusiveContext*, Handle<JSScript*>, SharedScriptData*, uint32_t);
|
|
|
|
enum XDRClassKind {
|
|
CK_BlockObject = 0,
|
|
CK_WithObject = 1,
|
|
CK_JSFunction = 2,
|
|
CK_JSObject = 3
|
|
};
|
|
|
|
template<XDRMode mode>
|
|
bool
|
|
js::XDRScript(XDRState<mode>* xdr, HandleObject enclosingScopeArg, HandleScript enclosingScript,
|
|
HandleFunction fun, MutableHandleScript scriptp)
|
|
{
|
|
/* NB: Keep this in sync with CopyScript. */
|
|
|
|
MOZ_ASSERT(enclosingScopeArg);
|
|
|
|
enum ScriptBits {
|
|
NoScriptRval,
|
|
SavedCallerFun,
|
|
Strict,
|
|
ContainsDynamicNameAccess,
|
|
FunHasExtensibleScope,
|
|
FunNeedsDeclEnvObject,
|
|
FunHasAnyAliasedFormal,
|
|
ArgumentsHasVarBinding,
|
|
NeedsArgsObj,
|
|
HasMappedArgsObj,
|
|
FunctionHasThisBinding,
|
|
IsGeneratorExp,
|
|
IsLegacyGenerator,
|
|
IsStarGenerator,
|
|
OwnSource,
|
|
ExplicitUseStrict,
|
|
SelfHosted,
|
|
HasSingleton,
|
|
TreatAsRunOnce,
|
|
HasLazyScript,
|
|
HasNonSyntacticScope,
|
|
HasInnerFunctions,
|
|
NeedsHomeObject,
|
|
IsDerivedClassConstructor,
|
|
IsDefaultClassConstructor,
|
|
};
|
|
|
|
uint32_t length, lineno, column, nslots;
|
|
uint32_t natoms, nsrcnotes, i;
|
|
uint32_t nconsts, nobjects, nregexps, ntrynotes, nblockscopes, nyieldoffsets;
|
|
uint32_t prologueLength, version;
|
|
uint32_t funLength = 0;
|
|
uint32_t nTypeSets = 0;
|
|
uint32_t scriptBits = 0;
|
|
|
|
JSContext* cx = xdr->cx();
|
|
RootedScript script(cx);
|
|
RootedObject enclosingScope(cx, enclosingScopeArg);
|
|
natoms = nsrcnotes = 0;
|
|
nconsts = nobjects = nregexps = ntrynotes = nblockscopes = nyieldoffsets = 0;
|
|
|
|
/* XDR arguments and vars. */
|
|
uint16_t nargs = 0;
|
|
uint16_t nblocklocals = 0;
|
|
uint16_t nbodylevellexicals = 0;
|
|
uint32_t nvars = 0;
|
|
uint32_t nunaliasedvars = 0;
|
|
uint16_t nunaliasedbodylevellexicals = 0;
|
|
if (mode == XDR_ENCODE) {
|
|
script = scriptp.get();
|
|
MOZ_ASSERT_IF(enclosingScript, enclosingScript->compartment() == script->compartment());
|
|
MOZ_ASSERT(script->functionNonDelazifying() == fun);
|
|
|
|
if (!fun && script->treatAsRunOnce()) {
|
|
// This is a toplevel or eval script that's runOnce. We want to
|
|
// make sure that we're not XDR-saving an object we emitted for
|
|
// JSOP_OBJECT that then got modified. So throw if we're not
|
|
// cloning in JSOP_OBJECT or if we ever didn't clone in it in the
|
|
// past.
|
|
JSCompartment* comp = cx->compartment();
|
|
if (!comp->creationOptions().cloneSingletons() ||
|
|
!comp->behaviors().getSingletonsAsTemplates())
|
|
{
|
|
JS_ReportError(cx,
|
|
"Can't serialize a run-once non-function script "
|
|
"when we're not doing singleton cloning");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
nargs = script->bindings.numArgs();
|
|
nblocklocals = script->bindings.numBlockScoped();
|
|
nbodylevellexicals = script->bindings.numBodyLevelLexicals();
|
|
nvars = script->bindings.numVars();
|
|
nunaliasedvars = script->bindings.numUnaliasedVars();
|
|
nunaliasedbodylevellexicals = script->bindings.numUnaliasedBodyLevelLexicals();
|
|
}
|
|
if (!xdr->codeUint16(&nargs))
|
|
return false;
|
|
if (!xdr->codeUint16(&nblocklocals))
|
|
return false;
|
|
if (!xdr->codeUint16(&nbodylevellexicals))
|
|
return false;
|
|
if (!xdr->codeUint32(&nvars))
|
|
return false;
|
|
if (!xdr->codeUint32(&nunaliasedvars))
|
|
return false;
|
|
if (!xdr->codeUint16(&nunaliasedbodylevellexicals))
|
|
return false;
|
|
|
|
if (mode == XDR_ENCODE)
|
|
length = script->length();
|
|
if (!xdr->codeUint32(&length))
|
|
return false;
|
|
|
|
if (mode == XDR_ENCODE) {
|
|
prologueLength = script->mainOffset();
|
|
MOZ_ASSERT(script->getVersion() != JSVERSION_UNKNOWN);
|
|
version = script->getVersion();
|
|
lineno = script->lineno();
|
|
column = script->column();
|
|
nslots = script->nslots();
|
|
natoms = script->natoms();
|
|
|
|
nsrcnotes = script->numNotes();
|
|
|
|
if (script->hasConsts())
|
|
nconsts = script->consts()->length;
|
|
if (script->hasObjects())
|
|
nobjects = script->objects()->length;
|
|
if (script->hasRegexps())
|
|
nregexps = script->regexps()->length;
|
|
if (script->hasTrynotes())
|
|
ntrynotes = script->trynotes()->length;
|
|
if (script->hasBlockScopes())
|
|
nblockscopes = script->blockScopes()->length;
|
|
if (script->hasYieldOffsets())
|
|
nyieldoffsets = script->yieldOffsets().length();
|
|
|
|
nTypeSets = script->nTypeSets();
|
|
funLength = script->funLength();
|
|
|
|
if (script->noScriptRval())
|
|
scriptBits |= (1 << NoScriptRval);
|
|
if (script->savedCallerFun())
|
|
scriptBits |= (1 << SavedCallerFun);
|
|
if (script->strict())
|
|
scriptBits |= (1 << Strict);
|
|
if (script->explicitUseStrict())
|
|
scriptBits |= (1 << ExplicitUseStrict);
|
|
if (script->selfHosted())
|
|
scriptBits |= (1 << SelfHosted);
|
|
if (script->bindingsAccessedDynamically())
|
|
scriptBits |= (1 << ContainsDynamicNameAccess);
|
|
if (script->funHasExtensibleScope())
|
|
scriptBits |= (1 << FunHasExtensibleScope);
|
|
if (script->funNeedsDeclEnvObject())
|
|
scriptBits |= (1 << FunNeedsDeclEnvObject);
|
|
if (script->funHasAnyAliasedFormal())
|
|
scriptBits |= (1 << FunHasAnyAliasedFormal);
|
|
if (script->argumentsHasVarBinding())
|
|
scriptBits |= (1 << ArgumentsHasVarBinding);
|
|
if (script->analyzedArgsUsage() && script->needsArgsObj())
|
|
scriptBits |= (1 << NeedsArgsObj);
|
|
if (script->hasMappedArgsObj())
|
|
scriptBits |= (1 << HasMappedArgsObj);
|
|
if (script->functionHasThisBinding())
|
|
scriptBits |= (1 << FunctionHasThisBinding);
|
|
if (!enclosingScript || enclosingScript->scriptSource() != script->scriptSource())
|
|
scriptBits |= (1 << OwnSource);
|
|
if (script->isGeneratorExp())
|
|
scriptBits |= (1 << IsGeneratorExp);
|
|
if (script->isLegacyGenerator())
|
|
scriptBits |= (1 << IsLegacyGenerator);
|
|
if (script->isStarGenerator())
|
|
scriptBits |= (1 << IsStarGenerator);
|
|
if (script->hasSingletons())
|
|
scriptBits |= (1 << HasSingleton);
|
|
if (script->treatAsRunOnce())
|
|
scriptBits |= (1 << TreatAsRunOnce);
|
|
if (script->isRelazifiable())
|
|
scriptBits |= (1 << HasLazyScript);
|
|
if (script->hasNonSyntacticScope())
|
|
scriptBits |= (1 << HasNonSyntacticScope);
|
|
if (script->hasInnerFunctions())
|
|
scriptBits |= (1 << HasInnerFunctions);
|
|
if (script->needsHomeObject())
|
|
scriptBits |= (1 << NeedsHomeObject);
|
|
if (script->isDerivedClassConstructor())
|
|
scriptBits |= (1 << IsDerivedClassConstructor);
|
|
if (script->isDefaultClassConstructor())
|
|
scriptBits |= (1 << IsDefaultClassConstructor);
|
|
}
|
|
|
|
if (!xdr->codeUint32(&prologueLength))
|
|
return false;
|
|
if (!xdr->codeUint32(&version))
|
|
return false;
|
|
|
|
// To fuse allocations, we need lengths of all embedded arrays early.
|
|
if (!xdr->codeUint32(&natoms))
|
|
return false;
|
|
if (!xdr->codeUint32(&nsrcnotes))
|
|
return false;
|
|
if (!xdr->codeUint32(&nconsts))
|
|
return false;
|
|
if (!xdr->codeUint32(&nobjects))
|
|
return false;
|
|
if (!xdr->codeUint32(&nregexps))
|
|
return false;
|
|
if (!xdr->codeUint32(&ntrynotes))
|
|
return false;
|
|
if (!xdr->codeUint32(&nblockscopes))
|
|
return false;
|
|
if (!xdr->codeUint32(&nyieldoffsets))
|
|
return false;
|
|
if (!xdr->codeUint32(&nTypeSets))
|
|
return false;
|
|
if (!xdr->codeUint32(&funLength))
|
|
return false;
|
|
if (!xdr->codeUint32(&scriptBits))
|
|
return false;
|
|
|
|
if (mode == XDR_DECODE) {
|
|
JSVersion version_ = JSVersion(version);
|
|
MOZ_ASSERT((version_ & VersionFlags::MASK) == unsigned(version_));
|
|
|
|
CompileOptions options(cx);
|
|
options.setVersion(version_)
|
|
.setNoScriptRval(!!(scriptBits & (1 << NoScriptRval)))
|
|
.setSelfHostingMode(!!(scriptBits & (1 << SelfHosted)));
|
|
RootedScriptSource sourceObject(cx);
|
|
if (scriptBits & (1 << OwnSource)) {
|
|
ScriptSource* ss = cx->new_<ScriptSource>();
|
|
if (!ss)
|
|
return false;
|
|
ScriptSourceHolder ssHolder(ss);
|
|
|
|
/*
|
|
* We use this CompileOptions only to initialize the
|
|
* ScriptSourceObject. Most CompileOptions fields aren't used by
|
|
* ScriptSourceObject, and those that are (element; elementAttributeName)
|
|
* aren't preserved by XDR. So this can be simple.
|
|
*/
|
|
CompileOptions options(cx);
|
|
ss->initFromOptions(cx, options);
|
|
sourceObject = ScriptSourceObject::create(cx, ss);
|
|
if (!sourceObject ||
|
|
!ScriptSourceObject::initFromOptions(cx, sourceObject, options))
|
|
return false;
|
|
} else {
|
|
MOZ_ASSERT(enclosingScript);
|
|
// When decoding, all the scripts and the script source object
|
|
// are in the same compartment, so the script's source object
|
|
// should never be a cross-compartment wrapper.
|
|
MOZ_ASSERT(enclosingScript->sourceObject()->is<ScriptSourceObject>());
|
|
sourceObject = &enclosingScript->sourceObject()->as<ScriptSourceObject>();
|
|
}
|
|
|
|
// If the outermost script has a non-syntactic scope, reflect that on
|
|
// the static scope chain.
|
|
if (scriptBits & (1 << HasNonSyntacticScope) &&
|
|
IsStaticGlobalLexicalScope(enclosingScope))
|
|
{
|
|
enclosingScope = StaticNonSyntacticScope::create(cx, enclosingScope);
|
|
if (!enclosingScope)
|
|
return false;
|
|
}
|
|
|
|
script = JSScript::Create(cx, enclosingScope, !!(scriptBits & (1 << SavedCallerFun)),
|
|
options, sourceObject, 0, 0);
|
|
if (!script)
|
|
return false;
|
|
|
|
// Set the script in its function now so that inner scripts to be
|
|
// decoded may iterate the static scope chain.
|
|
if (fun) {
|
|
fun->initScript(script);
|
|
script->setFunction(fun);
|
|
}
|
|
}
|
|
|
|
/* JSScript::partiallyInit assumes script->bindings is fully initialized. */
|
|
LifoAllocScope las(&cx->tempLifoAlloc());
|
|
if (!XDRScriptBindings(xdr, las, nargs, nvars, nbodylevellexicals, nblocklocals,
|
|
nunaliasedvars, nunaliasedbodylevellexicals, script))
|
|
return false;
|
|
|
|
if (mode == XDR_DECODE) {
|
|
if (!JSScript::partiallyInit(cx, script, nconsts, nobjects, nregexps, ntrynotes,
|
|
nblockscopes, nyieldoffsets, nTypeSets))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
MOZ_ASSERT(!script->mainOffset());
|
|
script->mainOffset_ = prologueLength;
|
|
script->setLength(length);
|
|
script->funLength_ = funLength;
|
|
|
|
scriptp.set(script);
|
|
|
|
if (scriptBits & (1 << Strict))
|
|
script->strict_ = true;
|
|
if (scriptBits & (1 << ExplicitUseStrict))
|
|
script->explicitUseStrict_ = true;
|
|
if (scriptBits & (1 << ContainsDynamicNameAccess))
|
|
script->bindingsAccessedDynamically_ = true;
|
|
if (scriptBits & (1 << FunHasExtensibleScope))
|
|
script->funHasExtensibleScope_ = true;
|
|
if (scriptBits & (1 << FunNeedsDeclEnvObject))
|
|
script->funNeedsDeclEnvObject_ = true;
|
|
if (scriptBits & (1 << FunHasAnyAliasedFormal))
|
|
script->funHasAnyAliasedFormal_ = true;
|
|
if (scriptBits & (1 << ArgumentsHasVarBinding))
|
|
script->setArgumentsHasVarBinding();
|
|
if (scriptBits & (1 << NeedsArgsObj))
|
|
script->setNeedsArgsObj(true);
|
|
if (scriptBits & (1 << HasMappedArgsObj))
|
|
script->hasMappedArgsObj_ = true;
|
|
if (scriptBits & (1 << FunctionHasThisBinding))
|
|
script->functionHasThisBinding_ = true;
|
|
if (scriptBits & (1 << IsGeneratorExp))
|
|
script->isGeneratorExp_ = true;
|
|
if (scriptBits & (1 << HasSingleton))
|
|
script->hasSingletons_ = true;
|
|
if (scriptBits & (1 << TreatAsRunOnce))
|
|
script->treatAsRunOnce_ = true;
|
|
if (scriptBits & (1 << HasNonSyntacticScope))
|
|
script->hasNonSyntacticScope_ = true;
|
|
if (scriptBits & (1 << HasInnerFunctions))
|
|
script->hasInnerFunctions_ = true;
|
|
if (scriptBits & (1 << NeedsHomeObject))
|
|
script->needsHomeObject_ = true;
|
|
if (scriptBits & (1 << IsDerivedClassConstructor))
|
|
script->isDerivedClassConstructor_ = true;
|
|
if (scriptBits & (1 << IsDefaultClassConstructor))
|
|
script->isDefaultClassConstructor_ = true;
|
|
|
|
if (scriptBits & (1 << IsLegacyGenerator)) {
|
|
MOZ_ASSERT(!(scriptBits & (1 << IsStarGenerator)));
|
|
script->setGeneratorKind(LegacyGenerator);
|
|
} else if (scriptBits & (1 << IsStarGenerator))
|
|
script->setGeneratorKind(StarGenerator);
|
|
}
|
|
|
|
JS_STATIC_ASSERT(sizeof(jsbytecode) == 1);
|
|
JS_STATIC_ASSERT(sizeof(jssrcnote) == 1);
|
|
|
|
if (scriptBits & (1 << OwnSource)) {
|
|
if (!script->scriptSource()->performXDR<mode>(xdr))
|
|
return false;
|
|
}
|
|
if (!xdr->codeUint32(&script->sourceStart_))
|
|
return false;
|
|
if (!xdr->codeUint32(&script->sourceEnd_))
|
|
return false;
|
|
|
|
if (!xdr->codeUint32(&lineno) ||
|
|
!xdr->codeUint32(&column) ||
|
|
!xdr->codeUint32(&nslots))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (mode == XDR_DECODE) {
|
|
script->lineno_ = lineno;
|
|
script->column_ = column;
|
|
script->nslots_ = nslots;
|
|
}
|
|
|
|
jsbytecode* code = script->code();
|
|
SharedScriptData* ssd;
|
|
if (mode == XDR_DECODE) {
|
|
ssd = SharedScriptData::new_(cx, length, nsrcnotes, natoms);
|
|
if (!ssd)
|
|
return false;
|
|
code = ssd->data;
|
|
if (natoms != 0) {
|
|
script->natoms_ = natoms;
|
|
script->atoms = ssd->atoms();
|
|
}
|
|
}
|
|
|
|
if (!xdr->codeBytes(code, length) || !xdr->codeBytes(code + length, nsrcnotes)) {
|
|
if (mode == XDR_DECODE)
|
|
js_free(ssd);
|
|
return false;
|
|
}
|
|
|
|
for (i = 0; i != natoms; ++i) {
|
|
if (mode == XDR_DECODE) {
|
|
RootedAtom tmp(cx);
|
|
if (!XDRAtom(xdr, &tmp))
|
|
return false;
|
|
script->atoms[i].init(tmp);
|
|
} else {
|
|
RootedAtom tmp(cx, script->atoms[i]);
|
|
if (!XDRAtom(xdr, &tmp))
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (mode == XDR_DECODE) {
|
|
if (!SaveSharedScriptData(cx, script, ssd, nsrcnotes))
|
|
return false;
|
|
}
|
|
|
|
if (nconsts) {
|
|
HeapValue* vector = script->consts()->vector;
|
|
RootedValue val(cx);
|
|
for (i = 0; i != nconsts; ++i) {
|
|
if (mode == XDR_ENCODE)
|
|
val = vector[i];
|
|
if (!XDRScriptConst(xdr, &val))
|
|
return false;
|
|
if (mode == XDR_DECODE)
|
|
vector[i].init(val);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Here looping from 0-to-length to xdr objects is essential to ensure that
|
|
* all references to enclosing blocks (via FindScopeObjectIndex below) happen
|
|
* after the enclosing block has been XDR'd.
|
|
*/
|
|
for (i = 0; i != nobjects; ++i) {
|
|
HeapPtrObject* objp = &script->objects()->vector[i];
|
|
XDRClassKind classk;
|
|
|
|
if (mode == XDR_ENCODE) {
|
|
JSObject* obj = *objp;
|
|
if (obj->is<StaticBlockScope>())
|
|
classk = CK_BlockObject;
|
|
else if (obj->is<StaticWithScope>())
|
|
classk = CK_WithObject;
|
|
else if (obj->is<JSFunction>())
|
|
classk = CK_JSFunction;
|
|
else if (obj->is<PlainObject>() || obj->is<ArrayObject>())
|
|
classk = CK_JSObject;
|
|
else
|
|
MOZ_CRASH("Cannot encode this class of object.");
|
|
}
|
|
|
|
if (!xdr->codeEnum32(&classk))
|
|
return false;
|
|
|
|
switch (classk) {
|
|
case CK_BlockObject:
|
|
case CK_WithObject: {
|
|
/* Code the nested block's enclosing scope. */
|
|
uint32_t enclosingStaticScopeIndex = 0;
|
|
if (mode == XDR_ENCODE) {
|
|
NestedStaticScope& scope = (*objp)->as<NestedStaticScope>();
|
|
if (NestedStaticScope* enclosing = scope.enclosingNestedScope()) {
|
|
if (IsStaticGlobalLexicalScope(enclosing))
|
|
enclosingStaticScopeIndex = UINT32_MAX;
|
|
else
|
|
enclosingStaticScopeIndex = FindScopeObjectIndex(script, *enclosing);
|
|
} else {
|
|
enclosingStaticScopeIndex = UINT32_MAX;
|
|
}
|
|
}
|
|
if (!xdr->codeUint32(&enclosingStaticScopeIndex))
|
|
return false;
|
|
Rooted<JSObject*> enclosingStaticScope(cx);
|
|
if (mode == XDR_DECODE) {
|
|
if (enclosingStaticScopeIndex != UINT32_MAX) {
|
|
MOZ_ASSERT(enclosingStaticScopeIndex < i);
|
|
enclosingStaticScope = script->objects()->vector[enclosingStaticScopeIndex];
|
|
} else {
|
|
// This is not ternary because MSVC can't typecheck the
|
|
// ternary.
|
|
if (fun)
|
|
enclosingStaticScope = fun;
|
|
else
|
|
enclosingStaticScope = enclosingScope;
|
|
}
|
|
}
|
|
|
|
if (classk == CK_BlockObject) {
|
|
Rooted<StaticBlockScope*> tmp(cx, static_cast<StaticBlockScope*>(objp->get()));
|
|
if (!XDRStaticBlockScope(xdr, enclosingStaticScope, &tmp))
|
|
return false;
|
|
*objp = tmp;
|
|
} else {
|
|
Rooted<StaticWithScope*> tmp(cx, static_cast<StaticWithScope*>(objp->get()));
|
|
if (!XDRStaticWithScope(xdr, enclosingStaticScope, &tmp))
|
|
return false;
|
|
*objp = tmp;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case CK_JSFunction: {
|
|
/* Code the nested function's enclosing scope. */
|
|
uint32_t funEnclosingScopeIndex = 0;
|
|
RootedObject funEnclosingScope(cx);
|
|
if (mode == XDR_ENCODE) {
|
|
RootedFunction function(cx, &(*objp)->as<JSFunction>());
|
|
|
|
if (function->isInterpretedLazy())
|
|
funEnclosingScope = function->lazyScript()->enclosingScope();
|
|
else if (function->isInterpreted())
|
|
funEnclosingScope = function->nonLazyScript()->enclosingStaticScope();
|
|
else {
|
|
MOZ_ASSERT(function->isAsmJSNative());
|
|
JS_ReportError(cx, "AsmJS modules are not yet supported in XDR serialization.");
|
|
return false;
|
|
}
|
|
|
|
StaticScopeIter<NoGC> ssi(funEnclosingScope);
|
|
|
|
// Starting from a nested function, hitting a non-syntactic
|
|
// scope on the static scope chain means that its enclosing
|
|
// function has a non-syntactic scope. Nested functions
|
|
// themselves never have non-syntactic scope chains.
|
|
if (ssi.done() ||
|
|
ssi.type() == StaticScopeIter<NoGC>::NonSyntactic ||
|
|
ssi.type() == StaticScopeIter<NoGC>::Function)
|
|
{
|
|
MOZ_ASSERT_IF(ssi.done() || ssi.type() != StaticScopeIter<NoGC>::Function, !fun);
|
|
funEnclosingScopeIndex = UINT32_MAX;
|
|
} else if (ssi.type() == StaticScopeIter<NoGC>::Block) {
|
|
if (ssi.block().isGlobal()) {
|
|
funEnclosingScopeIndex = UINT32_MAX;
|
|
} else {
|
|
funEnclosingScopeIndex = FindScopeObjectIndex(script, ssi.block());
|
|
MOZ_ASSERT(funEnclosingScopeIndex < i);
|
|
}
|
|
} else {
|
|
funEnclosingScopeIndex = FindScopeObjectIndex(script, ssi.staticWith());
|
|
MOZ_ASSERT(funEnclosingScopeIndex < i);
|
|
}
|
|
}
|
|
|
|
if (!xdr->codeUint32(&funEnclosingScopeIndex))
|
|
return false;
|
|
|
|
if (mode == XDR_DECODE) {
|
|
if (funEnclosingScopeIndex == UINT32_MAX) {
|
|
// This is not ternary because MSVC can't typecheck the
|
|
// ternary.
|
|
if (fun)
|
|
funEnclosingScope = fun;
|
|
else
|
|
funEnclosingScope = enclosingScope;
|
|
} else {
|
|
MOZ_ASSERT(funEnclosingScopeIndex < i);
|
|
funEnclosingScope = script->objects()->vector[funEnclosingScopeIndex];
|
|
}
|
|
}
|
|
|
|
// Code nested function and script.
|
|
RootedFunction tmp(cx);
|
|
if (mode == XDR_ENCODE)
|
|
tmp = &(*objp)->as<JSFunction>();
|
|
if (!XDRInterpretedFunction(xdr, funEnclosingScope, script, &tmp))
|
|
return false;
|
|
*objp = tmp;
|
|
break;
|
|
}
|
|
|
|
case CK_JSObject: {
|
|
/* Code object literal. */
|
|
RootedObject tmp(cx, *objp);
|
|
if (!XDRObjectLiteral(xdr, &tmp))
|
|
return false;
|
|
*objp = tmp;
|
|
break;
|
|
}
|
|
|
|
default: {
|
|
MOZ_ASSERT(false, "Unknown class kind.");
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (i = 0; i != nregexps; ++i) {
|
|
Rooted<RegExpObject*> regexp(cx);
|
|
if (mode == XDR_ENCODE)
|
|
regexp = &script->regexps()->vector[i]->as<RegExpObject>();
|
|
if (!XDRScriptRegExpObject(xdr, ®exp))
|
|
return false;
|
|
if (mode == XDR_DECODE)
|
|
script->regexps()->vector[i] = regexp;
|
|
}
|
|
|
|
if (ntrynotes != 0) {
|
|
JSTryNote* tnfirst = script->trynotes()->vector;
|
|
MOZ_ASSERT(script->trynotes()->length == ntrynotes);
|
|
JSTryNote* tn = tnfirst + ntrynotes;
|
|
do {
|
|
--tn;
|
|
if (!xdr->codeUint8(&tn->kind) ||
|
|
!xdr->codeUint32(&tn->stackDepth) ||
|
|
!xdr->codeUint32(&tn->start) ||
|
|
!xdr->codeUint32(&tn->length)) {
|
|
return false;
|
|
}
|
|
} while (tn != tnfirst);
|
|
}
|
|
|
|
for (i = 0; i < nblockscopes; ++i) {
|
|
BlockScopeNote* note = &script->blockScopes()->vector[i];
|
|
if (!xdr->codeUint32(¬e->index) ||
|
|
!xdr->codeUint32(¬e->start) ||
|
|
!xdr->codeUint32(¬e->length) ||
|
|
!xdr->codeUint32(¬e->parent))
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < nyieldoffsets; ++i) {
|
|
uint32_t* offset = &script->yieldOffsets()[i];
|
|
if (!xdr->codeUint32(offset))
|
|
return false;
|
|
}
|
|
|
|
if (scriptBits & (1 << HasLazyScript)) {
|
|
Rooted<LazyScript*> lazy(cx);
|
|
if (mode == XDR_ENCODE)
|
|
lazy = script->maybeLazyScript();
|
|
|
|
if (!XDRRelazificationInfo(xdr, fun, script, enclosingScope, &lazy))
|
|
return false;
|
|
|
|
if (mode == XDR_DECODE)
|
|
script->setLazyScript(lazy);
|
|
}
|
|
|
|
if (mode == XDR_DECODE) {
|
|
scriptp.set(script);
|
|
|
|
/* see BytecodeEmitter::tellDebuggerAboutCompiledScript */
|
|
if (!fun)
|
|
Debugger::onNewScript(cx, script);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
template bool
|
|
js::XDRScript(XDRState<XDR_ENCODE>*, HandleObject, HandleScript, HandleFunction,
|
|
MutableHandleScript);
|
|
|
|
template bool
|
|
js::XDRScript(XDRState<XDR_DECODE>*, HandleObject, HandleScript, HandleFunction,
|
|
MutableHandleScript);
|
|
|
|
template<XDRMode mode>
|
|
bool
|
|
js::XDRLazyScript(XDRState<mode>* xdr, HandleObject enclosingScope, HandleScript enclosingScript,
|
|
HandleFunction fun, MutableHandle<LazyScript*> lazy)
|
|
{
|
|
JSContext* cx = xdr->cx();
|
|
|
|
{
|
|
uint32_t begin;
|
|
uint32_t end;
|
|
uint32_t lineno;
|
|
uint32_t column;
|
|
uint64_t packedFields;
|
|
|
|
if (mode == XDR_ENCODE) {
|
|
// Note: it's possible the LazyScript has a non-null script_ pointer
|
|
// to a JSScript. We don't encode it: we can just delazify the
|
|
// lazy script.
|
|
|
|
MOZ_ASSERT(fun == lazy->functionNonDelazifying());
|
|
|
|
begin = lazy->begin();
|
|
end = lazy->end();
|
|
lineno = lazy->lineno();
|
|
column = lazy->column();
|
|
packedFields = lazy->packedFields();
|
|
}
|
|
|
|
if (!xdr->codeUint32(&begin) || !xdr->codeUint32(&end) ||
|
|
!xdr->codeUint32(&lineno) || !xdr->codeUint32(&column) ||
|
|
!xdr->codeUint64(&packedFields))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (mode == XDR_DECODE) {
|
|
lazy.set(LazyScript::Create(cx, fun, nullptr, enclosingScope, enclosingScript,
|
|
packedFields, begin, end, lineno, column));
|
|
if (!lazy)
|
|
return false;
|
|
fun->initLazyScript(lazy);
|
|
}
|
|
}
|
|
|
|
// Code free variables.
|
|
if (!XDRLazyFreeVariables(xdr, lazy))
|
|
return false;
|
|
|
|
// Code inner functions.
|
|
{
|
|
RootedFunction func(cx);
|
|
HeapPtrFunction* innerFunctions = lazy->innerFunctions();
|
|
size_t numInnerFunctions = lazy->numInnerFunctions();
|
|
for (size_t i = 0; i < numInnerFunctions; i++) {
|
|
if (mode == XDR_ENCODE)
|
|
func = innerFunctions[i];
|
|
|
|
if (!XDRInterpretedFunction(xdr, fun, enclosingScript, &func))
|
|
return false;
|
|
|
|
if (mode == XDR_DECODE)
|
|
innerFunctions[i] = func;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
template bool
|
|
js::XDRLazyScript(XDRState<XDR_ENCODE>*, HandleObject, HandleScript,
|
|
HandleFunction, MutableHandle<LazyScript*>);
|
|
|
|
template bool
|
|
js::XDRLazyScript(XDRState<XDR_DECODE>*, HandleObject, HandleScript,
|
|
HandleFunction, MutableHandle<LazyScript*>);
|
|
|
|
void
|
|
JSScript::setSourceObject(JSObject* object)
|
|
{
|
|
MOZ_ASSERT(compartment() == object->compartment());
|
|
sourceObject_ = object;
|
|
}
|
|
|
|
js::ScriptSourceObject&
|
|
JSScript::scriptSourceUnwrap() const {
|
|
return UncheckedUnwrap(sourceObject())->as<ScriptSourceObject>();
|
|
}
|
|
|
|
js::ScriptSource*
|
|
JSScript::scriptSource() const {
|
|
return scriptSourceUnwrap().source();
|
|
}
|
|
|
|
js::ScriptSource*
|
|
JSScript::maybeForwardedScriptSource() const {
|
|
return UncheckedUnwrap(MaybeForwarded(sourceObject()))->as<ScriptSourceObject>().source();
|
|
}
|
|
|
|
bool
|
|
JSScript::initScriptCounts(JSContext* cx)
|
|
{
|
|
MOZ_ASSERT(!hasScriptCounts());
|
|
|
|
// Record all pc which are the first instruction of a basic block.
|
|
mozilla::Vector<jsbytecode*, 16, SystemAllocPolicy> jumpTargets;
|
|
jsbytecode* end = codeEnd();
|
|
jsbytecode* mainEntry = main();
|
|
for (jsbytecode* pc = code(); pc != end; pc = GetNextPc(pc)) {
|
|
if (pc == mainEntry) {
|
|
if (!jumpTargets.append(pc)) {
|
|
ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool jump = IsJumpOpcode(JSOp(*pc));
|
|
if (jump) {
|
|
jsbytecode* target = pc + GET_JUMP_OFFSET(pc);
|
|
if (!jumpTargets.append(target)) {
|
|
ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
|
|
if (BytecodeFallsThrough(JSOp(*pc))) {
|
|
jsbytecode* fallthrough = GetNextPc(pc);
|
|
if (!jumpTargets.append(fallthrough)) {
|
|
ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (JSOp(*pc) == JSOP_TABLESWITCH) {
|
|
jsbytecode* pc2 = pc;
|
|
int32_t len = GET_JUMP_OFFSET(pc2);
|
|
|
|
// Default target.
|
|
if (!jumpTargets.append(pc + len)) {
|
|
ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
|
|
pc2 += JUMP_OFFSET_LEN;
|
|
int32_t low = GET_JUMP_OFFSET(pc2);
|
|
pc2 += JUMP_OFFSET_LEN;
|
|
int32_t high = GET_JUMP_OFFSET(pc2);
|
|
|
|
for (int i = 0; i < high-low+1; i++) {
|
|
pc2 += JUMP_OFFSET_LEN;
|
|
int32_t off = (int32_t) GET_JUMP_OFFSET(pc2);
|
|
if (off) {
|
|
// Case (i + low)
|
|
if (!jumpTargets.append(pc + off)) {
|
|
ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Mark catch/finally blocks as being jump targets.
|
|
if (hasTrynotes()) {
|
|
JSTryNote* tn = trynotes()->vector;
|
|
JSTryNote* tnlimit = tn + trynotes()->length;
|
|
for (; tn < tnlimit; tn++) {
|
|
jsbytecode* tryStart = mainEntry + tn->start;
|
|
jsbytecode* tryPc = tryStart - 1;
|
|
if (JSOp(*tryPc) != JSOP_TRY)
|
|
continue;
|
|
|
|
jsbytecode* tryTarget = tryStart + tn->length;
|
|
if (!jumpTargets.append(tryTarget)) {
|
|
ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Sort all pc, and remove duplicates.
|
|
std::sort(jumpTargets.begin(), jumpTargets.end());
|
|
auto last = std::unique(jumpTargets.begin(), jumpTargets.end());
|
|
jumpTargets.erase(last, jumpTargets.end());
|
|
|
|
// Initialize all PCCounts counters to 0.
|
|
ScriptCounts::PCCountsVector base;
|
|
if (!base.reserve(jumpTargets.length())) {
|
|
ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
|
|
for (size_t i = 0; i < jumpTargets.length(); i++)
|
|
base.infallibleEmplaceBack(pcToOffset(jumpTargets[i]));
|
|
|
|
// Create compartment's scriptCountsMap if necessary.
|
|
ScriptCountsMap* map = compartment()->scriptCountsMap;
|
|
if (!map) {
|
|
map = cx->new_<ScriptCountsMap>();
|
|
if (!map) {
|
|
ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
|
|
if (!map->init()) {
|
|
js_delete(map);
|
|
ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
|
|
compartment()->scriptCountsMap = map;
|
|
}
|
|
|
|
// Allocate the ScriptCounts.
|
|
ScriptCounts* sc = cx->new_<ScriptCounts>(Move(base));
|
|
if (!sc) {
|
|
ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
auto guardScriptCounts = mozilla::MakeScopeExit([&] () {
|
|
js_delete(sc);
|
|
});
|
|
|
|
// Register the current ScriptCounts in the compartment's map.
|
|
if (!map->putNew(this, sc)) {
|
|
ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
|
|
// safe to set this; we can't fail after this point.
|
|
hasScriptCounts_ = true;
|
|
guardScriptCounts.release();
|
|
|
|
// Enable interrupts in any interpreter frames running on this script. This
|
|
// is used to let the interpreter increment the PCCounts, if present.
|
|
for (ActivationIterator iter(cx->runtime()); !iter.done(); ++iter) {
|
|
if (iter->isInterpreter())
|
|
iter->asInterpreter()->enableInterruptsIfRunning(this);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static inline ScriptCountsMap::Ptr GetScriptCountsMapEntry(JSScript* script)
|
|
{
|
|
MOZ_ASSERT(script->hasScriptCounts());
|
|
ScriptCountsMap* map = script->compartment()->scriptCountsMap;
|
|
ScriptCountsMap::Ptr p = map->lookup(script);
|
|
MOZ_ASSERT(p);
|
|
return p;
|
|
}
|
|
|
|
ScriptCounts&
|
|
JSScript::getScriptCounts()
|
|
{
|
|
ScriptCountsMap::Ptr p = GetScriptCountsMapEntry(this);
|
|
return *p->value();
|
|
}
|
|
|
|
js::PCCounts*
|
|
ScriptCounts::maybeGetPCCounts(size_t offset) {
|
|
PCCounts searched = PCCounts(offset);
|
|
PCCounts* elem = std::lower_bound(pcCounts_.begin(), pcCounts_.end(), searched);
|
|
if (elem == pcCounts_.end() || elem->pcOffset() != offset)
|
|
return nullptr;
|
|
return elem;
|
|
}
|
|
|
|
const js::PCCounts*
|
|
ScriptCounts::maybeGetPCCounts(size_t offset) const {
|
|
PCCounts searched = PCCounts(offset);
|
|
const PCCounts* elem = std::lower_bound(pcCounts_.begin(), pcCounts_.end(), searched);
|
|
if (elem == pcCounts_.end() || elem->pcOffset() != offset)
|
|
return nullptr;
|
|
return elem;
|
|
}
|
|
|
|
js::PCCounts*
|
|
ScriptCounts::getImmediatePrecedingPCCounts(size_t offset)
|
|
{
|
|
PCCounts searched = PCCounts(offset);
|
|
PCCounts* elem = std::lower_bound(pcCounts_.begin(), pcCounts_.end(), searched);
|
|
if (elem == pcCounts_.end())
|
|
return &pcCounts_.back();
|
|
if (elem->pcOffset() == offset)
|
|
return elem;
|
|
if (elem != pcCounts_.begin())
|
|
return elem - 1;
|
|
return nullptr;
|
|
}
|
|
|
|
const js::PCCounts*
|
|
ScriptCounts::maybeGetThrowCounts(size_t offset) const {
|
|
PCCounts searched = PCCounts(offset);
|
|
const PCCounts* elem = std::lower_bound(throwCounts_.begin(), throwCounts_.end(), searched);
|
|
if (elem == throwCounts_.end() || elem->pcOffset() != offset)
|
|
return nullptr;
|
|
return elem;
|
|
}
|
|
|
|
const js::PCCounts*
|
|
ScriptCounts::getImmediatePrecedingThrowCounts(size_t offset) const
|
|
{
|
|
PCCounts searched = PCCounts(offset);
|
|
const PCCounts* elem = std::lower_bound(throwCounts_.begin(), throwCounts_.end(), searched);
|
|
if (elem == throwCounts_.end()) {
|
|
if (throwCounts_.begin() == throwCounts_.end())
|
|
return nullptr;
|
|
return &throwCounts_.back();
|
|
}
|
|
if (elem->pcOffset() == offset)
|
|
return elem;
|
|
if (elem != throwCounts_.begin())
|
|
return elem - 1;
|
|
return nullptr;
|
|
}
|
|
|
|
js::PCCounts*
|
|
ScriptCounts::getThrowCounts(size_t offset) {
|
|
PCCounts searched = PCCounts(offset);
|
|
PCCounts* elem = std::lower_bound(throwCounts_.begin(), throwCounts_.end(), searched);
|
|
if (elem == throwCounts_.end() || elem->pcOffset() != offset)
|
|
elem = throwCounts_.insert(elem, searched);
|
|
return elem;
|
|
}
|
|
|
|
void
|
|
JSScript::setIonScript(JSContext* maybecx, js::jit::IonScript* ionScript)
|
|
{
|
|
MOZ_ASSERT_IF(ionScript != ION_DISABLED_SCRIPT, !baselineScript()->hasPendingIonBuilder());
|
|
if (hasIonScript())
|
|
js::jit::IonScript::writeBarrierPre(zone(), ion);
|
|
ion = ionScript;
|
|
MOZ_ASSERT_IF(hasIonScript(), hasBaselineScript());
|
|
updateBaselineOrIonRaw(maybecx);
|
|
}
|
|
|
|
js::PCCounts*
|
|
JSScript::maybeGetPCCounts(jsbytecode* pc) {
|
|
MOZ_ASSERT(containsPC(pc));
|
|
return getScriptCounts().maybeGetPCCounts(pcToOffset(pc));
|
|
}
|
|
|
|
const js::PCCounts*
|
|
JSScript::maybeGetThrowCounts(jsbytecode* pc) {
|
|
MOZ_ASSERT(containsPC(pc));
|
|
return getScriptCounts().maybeGetThrowCounts(pcToOffset(pc));
|
|
}
|
|
|
|
js::PCCounts*
|
|
JSScript::getThrowCounts(jsbytecode* pc) {
|
|
MOZ_ASSERT(containsPC(pc));
|
|
return getScriptCounts().getThrowCounts(pcToOffset(pc));
|
|
}
|
|
|
|
uint64_t
|
|
JSScript::getHitCount(jsbytecode* pc)
|
|
{
|
|
MOZ_ASSERT(containsPC(pc));
|
|
if (pc < main())
|
|
pc = main();
|
|
|
|
ScriptCounts& sc = getScriptCounts();
|
|
size_t targetOffset = pcToOffset(pc);
|
|
const js::PCCounts* baseCount = sc.getImmediatePrecedingPCCounts(targetOffset);
|
|
if (!baseCount)
|
|
return 0;
|
|
if (baseCount->pcOffset() == targetOffset)
|
|
return baseCount->numExec();
|
|
MOZ_ASSERT(baseCount->pcOffset() < targetOffset);
|
|
uint64_t count = baseCount->numExec();
|
|
do {
|
|
const js::PCCounts* throwCount = sc.getImmediatePrecedingThrowCounts(targetOffset);
|
|
if (!throwCount)
|
|
return count;
|
|
if (throwCount->pcOffset() <= baseCount->pcOffset())
|
|
return count;
|
|
count -= throwCount->numExec();
|
|
targetOffset = throwCount->pcOffset() - 1;
|
|
} while (true);
|
|
}
|
|
|
|
void
|
|
JSScript::incHitCount(jsbytecode* pc)
|
|
{
|
|
MOZ_ASSERT(containsPC(pc));
|
|
if (pc < main())
|
|
pc = main();
|
|
|
|
ScriptCounts& sc = getScriptCounts();
|
|
js::PCCounts* baseCount = sc.getImmediatePrecedingPCCounts(pcToOffset(pc));
|
|
if (!baseCount)
|
|
return;
|
|
baseCount->numExec()++;
|
|
}
|
|
|
|
void
|
|
JSScript::addIonCounts(jit::IonScriptCounts* ionCounts)
|
|
{
|
|
ScriptCounts& sc = getScriptCounts();
|
|
if (sc.ionCounts_)
|
|
ionCounts->setPrevious(sc.ionCounts_);
|
|
sc.ionCounts_ = ionCounts;
|
|
}
|
|
|
|
jit::IonScriptCounts*
|
|
JSScript::getIonCounts()
|
|
{
|
|
return getScriptCounts().ionCounts_;
|
|
}
|
|
|
|
void
|
|
JSScript::takeOverScriptCountsMapEntry(ScriptCounts* entryValue)
|
|
{
|
|
#ifdef DEBUG
|
|
ScriptCountsMap::Ptr p = GetScriptCountsMapEntry(this);
|
|
MOZ_ASSERT(entryValue == p->value());
|
|
#endif
|
|
hasScriptCounts_ = false;
|
|
}
|
|
|
|
void
|
|
JSScript::releaseScriptCounts(ScriptCounts* counts)
|
|
{
|
|
ScriptCountsMap::Ptr p = GetScriptCountsMapEntry(this);
|
|
*counts = Move(*p->value());
|
|
js_delete(p->value());
|
|
compartment()->scriptCountsMap->remove(p);
|
|
hasScriptCounts_ = false;
|
|
}
|
|
|
|
void
|
|
JSScript::destroyScriptCounts(FreeOp* fop)
|
|
{
|
|
if (hasScriptCounts()) {
|
|
ScriptCounts scriptCounts;
|
|
releaseScriptCounts(&scriptCounts);
|
|
}
|
|
}
|
|
|
|
void
|
|
ScriptSourceObject::trace(JSTracer* trc, JSObject* obj)
|
|
{
|
|
ScriptSourceObject* sso = static_cast<ScriptSourceObject*>(obj);
|
|
|
|
// Don't trip over the poison 'not yet initialized' values.
|
|
if (!sso->getReservedSlot(INTRODUCTION_SCRIPT_SLOT).isMagic(JS_GENERIC_MAGIC)) {
|
|
JSScript* script = sso->introductionScript();
|
|
if (script) {
|
|
TraceManuallyBarrieredEdge(trc, &script, "ScriptSourceObject introductionScript");
|
|
sso->setReservedSlot(INTRODUCTION_SCRIPT_SLOT, PrivateValue(script));
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
ScriptSourceObject::finalize(FreeOp* fop, JSObject* obj)
|
|
{
|
|
ScriptSourceObject* sso = &obj->as<ScriptSourceObject>();
|
|
|
|
// If code coverage is enabled, record the filename associated with this
|
|
// source object.
|
|
if (fop->runtime()->lcovOutput.isEnabled())
|
|
sso->compartment()->lcovOutput.collectSourceFile(sso->compartment(), sso);
|
|
|
|
sso->source()->decref();
|
|
sso->setReservedSlot(SOURCE_SLOT, PrivateValue(nullptr));
|
|
}
|
|
|
|
const Class ScriptSourceObject::class_ = {
|
|
"ScriptSource",
|
|
JSCLASS_HAS_RESERVED_SLOTS(RESERVED_SLOTS) |
|
|
JSCLASS_IS_ANONYMOUS,
|
|
nullptr, /* addProperty */
|
|
nullptr, /* delProperty */
|
|
nullptr, /* getProperty */
|
|
nullptr, /* setProperty */
|
|
nullptr, /* enumerate */
|
|
nullptr, /* resolve */
|
|
nullptr, /* mayResolve */
|
|
finalize,
|
|
nullptr, /* call */
|
|
nullptr, /* hasInstance */
|
|
nullptr, /* construct */
|
|
trace
|
|
};
|
|
|
|
ScriptSourceObject*
|
|
ScriptSourceObject::create(ExclusiveContext* cx, ScriptSource* source)
|
|
{
|
|
RootedObject object(cx, NewObjectWithGivenProto(cx, &class_, nullptr));
|
|
if (!object)
|
|
return nullptr;
|
|
RootedScriptSource sourceObject(cx, &object->as<ScriptSourceObject>());
|
|
|
|
source->incref(); // The matching decref is in ScriptSourceObject::finalize.
|
|
sourceObject->initReservedSlot(SOURCE_SLOT, PrivateValue(source));
|
|
|
|
// The remaining slots should eventually be populated by a call to
|
|
// initFromOptions. Poison them until that point.
|
|
sourceObject->initReservedSlot(ELEMENT_SLOT, MagicValue(JS_GENERIC_MAGIC));
|
|
sourceObject->initReservedSlot(ELEMENT_PROPERTY_SLOT, MagicValue(JS_GENERIC_MAGIC));
|
|
sourceObject->initReservedSlot(INTRODUCTION_SCRIPT_SLOT, MagicValue(JS_GENERIC_MAGIC));
|
|
|
|
return sourceObject;
|
|
}
|
|
|
|
/* static */ bool
|
|
ScriptSourceObject::initFromOptions(JSContext* cx, HandleScriptSource source,
|
|
const ReadOnlyCompileOptions& options)
|
|
{
|
|
assertSameCompartment(cx, source);
|
|
MOZ_ASSERT(source->getReservedSlot(ELEMENT_SLOT).isMagic(JS_GENERIC_MAGIC));
|
|
MOZ_ASSERT(source->getReservedSlot(ELEMENT_PROPERTY_SLOT).isMagic(JS_GENERIC_MAGIC));
|
|
MOZ_ASSERT(source->getReservedSlot(INTRODUCTION_SCRIPT_SLOT).isMagic(JS_GENERIC_MAGIC));
|
|
|
|
RootedValue element(cx, ObjectOrNullValue(options.element()));
|
|
if (!cx->compartment()->wrap(cx, &element))
|
|
return false;
|
|
source->setReservedSlot(ELEMENT_SLOT, element);
|
|
|
|
RootedValue elementAttributeName(cx);
|
|
if (options.elementAttributeName())
|
|
elementAttributeName = StringValue(options.elementAttributeName());
|
|
else
|
|
elementAttributeName = UndefinedValue();
|
|
if (!cx->compartment()->wrap(cx, &elementAttributeName))
|
|
return false;
|
|
source->setReservedSlot(ELEMENT_PROPERTY_SLOT, elementAttributeName);
|
|
|
|
// There is no equivalent of cross-compartment wrappers for scripts. If the
|
|
// introduction script and ScriptSourceObject are in different compartments,
|
|
// we would be creating a cross-compartment script reference, which is
|
|
// forbidden. In that case, simply don't bother to retain the introduction
|
|
// script.
|
|
if (options.introductionScript() &&
|
|
options.introductionScript()->compartment() == cx->compartment())
|
|
{
|
|
source->setReservedSlot(INTRODUCTION_SCRIPT_SLOT, PrivateValue(options.introductionScript()));
|
|
} else {
|
|
source->setReservedSlot(INTRODUCTION_SCRIPT_SLOT, UndefinedValue());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/* static */ bool
|
|
JSScript::loadSource(JSContext* cx, ScriptSource* ss, bool* worked)
|
|
{
|
|
MOZ_ASSERT(!ss->hasSourceData());
|
|
*worked = false;
|
|
if (!cx->runtime()->sourceHook || !ss->sourceRetrievable())
|
|
return true;
|
|
char16_t* src = nullptr;
|
|
size_t length;
|
|
if (!cx->runtime()->sourceHook->load(cx, ss->filename(), &src, &length))
|
|
return false;
|
|
if (!src)
|
|
return true;
|
|
ss->setSource(src, length);
|
|
*worked = true;
|
|
return true;
|
|
}
|
|
|
|
JSFlatString*
|
|
JSScript::sourceData(JSContext* cx)
|
|
{
|
|
MOZ_ASSERT(scriptSource()->hasSourceData());
|
|
return scriptSource()->substring(cx, sourceStart(), sourceEnd());
|
|
}
|
|
|
|
UncompressedSourceCache::AutoHoldEntry::AutoHoldEntry()
|
|
: cache_(nullptr), source_(nullptr), charsToFree_(nullptr)
|
|
{
|
|
}
|
|
|
|
void
|
|
UncompressedSourceCache::AutoHoldEntry::holdEntry(UncompressedSourceCache* cache, ScriptSource* source)
|
|
{
|
|
// Initialise the holder for a specific cache and script source. This will
|
|
// hold on to the cached source chars in the event that the cache is purged.
|
|
MOZ_ASSERT(!cache_ && !source_ && !charsToFree_);
|
|
cache_ = cache;
|
|
source_ = source;
|
|
}
|
|
|
|
void
|
|
UncompressedSourceCache::AutoHoldEntry::deferDelete(const char16_t* chars)
|
|
{
|
|
// Take ownership of source chars now the cache is being purged. Remove our
|
|
// reference to the ScriptSource which might soon be destroyed.
|
|
MOZ_ASSERT(cache_ && source_ && !charsToFree_);
|
|
cache_ = nullptr;
|
|
source_ = nullptr;
|
|
charsToFree_ = chars;
|
|
}
|
|
|
|
UncompressedSourceCache::AutoHoldEntry::~AutoHoldEntry()
|
|
{
|
|
// The holder is going out of scope. If it has taken ownership of cached
|
|
// chars then delete them, otherwise unregister ourself with the cache.
|
|
if (charsToFree_) {
|
|
MOZ_ASSERT(!cache_ && !source_);
|
|
js_free(const_cast<char16_t*>(charsToFree_));
|
|
} else if (cache_) {
|
|
MOZ_ASSERT(source_);
|
|
cache_->releaseEntry(*this);
|
|
}
|
|
}
|
|
|
|
void
|
|
UncompressedSourceCache::holdEntry(AutoHoldEntry& holder, ScriptSource* ss)
|
|
{
|
|
MOZ_ASSERT(!holder_);
|
|
holder.holdEntry(this, ss);
|
|
holder_ = &holder;
|
|
}
|
|
|
|
void
|
|
UncompressedSourceCache::releaseEntry(AutoHoldEntry& holder)
|
|
{
|
|
MOZ_ASSERT(holder_ == &holder);
|
|
holder_ = nullptr;
|
|
}
|
|
|
|
const char16_t*
|
|
UncompressedSourceCache::lookup(ScriptSource* ss, AutoHoldEntry& holder)
|
|
{
|
|
MOZ_ASSERT(!holder_);
|
|
if (!map_)
|
|
return nullptr;
|
|
if (Map::Ptr p = map_->lookup(ss)) {
|
|
holdEntry(holder, ss);
|
|
return p->value();
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
bool
|
|
UncompressedSourceCache::put(ScriptSource* ss, const char16_t* str, AutoHoldEntry& holder)
|
|
{
|
|
MOZ_ASSERT(!holder_);
|
|
|
|
if (!map_) {
|
|
map_ = js_new<Map>();
|
|
if (!map_)
|
|
return false;
|
|
|
|
if (!map_->init()) {
|
|
js_delete(map_);
|
|
map_ = nullptr;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (!map_->put(ss, str))
|
|
return false;
|
|
|
|
holdEntry(holder, ss);
|
|
return true;
|
|
}
|
|
|
|
void
|
|
UncompressedSourceCache::purge()
|
|
{
|
|
if (!map_)
|
|
return;
|
|
|
|
for (Map::Range r = map_->all(); !r.empty(); r.popFront()) {
|
|
const char16_t* chars = r.front().value();
|
|
if (holder_ && r.front().key() == holder_->source()) {
|
|
holder_->deferDelete(chars);
|
|
holder_ = nullptr;
|
|
} else {
|
|
js_free(const_cast<char16_t*>(chars));
|
|
}
|
|
}
|
|
|
|
js_delete(map_);
|
|
map_ = nullptr;
|
|
}
|
|
|
|
size_t
|
|
UncompressedSourceCache::sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf)
|
|
{
|
|
size_t n = 0;
|
|
if (map_ && !map_->empty()) {
|
|
n += map_->sizeOfIncludingThis(mallocSizeOf);
|
|
for (Map::Range r = map_->all(); !r.empty(); r.popFront()) {
|
|
const char16_t* v = r.front().value();
|
|
n += mallocSizeOf(v);
|
|
}
|
|
}
|
|
return n;
|
|
}
|
|
|
|
const char16_t*
|
|
ScriptSource::chars(JSContext* cx, UncompressedSourceCache::AutoHoldEntry& holder)
|
|
{
|
|
switch (dataType) {
|
|
case DataUncompressed:
|
|
return uncompressedChars();
|
|
|
|
case DataCompressed: {
|
|
if (const char16_t* decompressed = cx->runtime()->uncompressedSourceCache.lookup(this, holder))
|
|
return decompressed;
|
|
|
|
const size_t nbytes = sizeof(char16_t) * (length_ + 1);
|
|
char16_t* decompressed = static_cast<char16_t*>(js_malloc(nbytes));
|
|
if (!decompressed) {
|
|
JS_ReportOutOfMemory(cx);
|
|
return nullptr;
|
|
}
|
|
|
|
if (!DecompressString((const unsigned char*) compressedData(), compressedBytes(),
|
|
reinterpret_cast<unsigned char*>(decompressed), nbytes)) {
|
|
JS_ReportOutOfMemory(cx);
|
|
js_free(decompressed);
|
|
return nullptr;
|
|
}
|
|
|
|
decompressed[length_] = 0;
|
|
|
|
if (!cx->runtime()->uncompressedSourceCache.put(this, decompressed, holder)) {
|
|
JS_ReportOutOfMemory(cx);
|
|
js_free(decompressed);
|
|
return nullptr;
|
|
}
|
|
|
|
return decompressed;
|
|
}
|
|
|
|
case DataParent:
|
|
return parent()->chars(cx, holder);
|
|
|
|
default:
|
|
MOZ_CRASH();
|
|
}
|
|
}
|
|
|
|
JSFlatString*
|
|
ScriptSource::substring(JSContext* cx, uint32_t start, uint32_t stop)
|
|
{
|
|
MOZ_ASSERT(start <= stop);
|
|
UncompressedSourceCache::AutoHoldEntry holder;
|
|
const char16_t* chars = this->chars(cx, holder);
|
|
if (!chars)
|
|
return nullptr;
|
|
return NewStringCopyN<CanGC>(cx, chars + start, stop - start);
|
|
}
|
|
|
|
JSFlatString*
|
|
ScriptSource::substringDontDeflate(JSContext* cx, uint32_t start, uint32_t stop)
|
|
{
|
|
MOZ_ASSERT(start <= stop);
|
|
UncompressedSourceCache::AutoHoldEntry holder;
|
|
const char16_t* chars = this->chars(cx, holder);
|
|
if (!chars)
|
|
return nullptr;
|
|
return NewStringCopyNDontDeflate<CanGC>(cx, chars + start, stop - start);
|
|
}
|
|
|
|
void
|
|
ScriptSource::setSource(const char16_t* chars, size_t length, bool ownsChars /* = true */)
|
|
{
|
|
MOZ_ASSERT(dataType == DataMissing);
|
|
|
|
dataType = DataUncompressed;
|
|
data.uncompressed.chars = chars;
|
|
data.uncompressed.ownsChars = ownsChars;
|
|
|
|
length_ = length;
|
|
}
|
|
|
|
void
|
|
ScriptSource::setCompressedSource(JSRuntime* maybert, void* raw, size_t nbytes, HashNumber hash)
|
|
{
|
|
MOZ_ASSERT(dataType == DataMissing || dataType == DataUncompressed);
|
|
if (dataType == DataUncompressed && ownsUncompressedChars())
|
|
js_free(const_cast<char16_t*>(uncompressedChars()));
|
|
|
|
dataType = DataCompressed;
|
|
data.compressed.raw = raw;
|
|
data.compressed.nbytes = nbytes;
|
|
data.compressed.hash = hash;
|
|
|
|
if (maybert)
|
|
updateCompressedSourceSet(maybert);
|
|
}
|
|
|
|
void
|
|
ScriptSource::updateCompressedSourceSet(JSRuntime* rt)
|
|
{
|
|
MOZ_ASSERT(dataType == DataCompressed);
|
|
MOZ_ASSERT(!inCompressedSourceSet);
|
|
|
|
CompressedSourceSet::AddPtr p = rt->compressedSourceSet.lookupForAdd(this);
|
|
if (p) {
|
|
// There is another ScriptSource with the same compressed data.
|
|
// Mark that ScriptSource as the parent and use it for all attempts to
|
|
// get the source for this ScriptSource.
|
|
ScriptSource* parent = *p;
|
|
parent->incref();
|
|
|
|
js_free(compressedData());
|
|
dataType = DataParent;
|
|
data.parent = parent;
|
|
} else {
|
|
if (rt->compressedSourceSet.add(p, this))
|
|
inCompressedSourceSet = true;
|
|
}
|
|
}
|
|
|
|
bool
|
|
ScriptSource::ensureOwnsSource(ExclusiveContext* cx)
|
|
{
|
|
MOZ_ASSERT(dataType == DataUncompressed);
|
|
if (ownsUncompressedChars())
|
|
return true;
|
|
|
|
char16_t* uncompressed = cx->zone()->pod_malloc<char16_t>(Max<size_t>(length_, 1));
|
|
if (!uncompressed) {
|
|
ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
PodCopy(uncompressed, uncompressedChars(), length_);
|
|
|
|
data.uncompressed.chars = uncompressed;
|
|
data.uncompressed.ownsChars = true;
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
ScriptSource::setSourceCopy(ExclusiveContext* cx, SourceBufferHolder& srcBuf,
|
|
bool argumentsNotIncluded, SourceCompressionTask* task)
|
|
{
|
|
MOZ_ASSERT(!hasSourceData());
|
|
argumentsNotIncluded_ = argumentsNotIncluded;
|
|
|
|
bool owns = srcBuf.ownsChars();
|
|
setSource(owns ? srcBuf.take() : srcBuf.get(), srcBuf.length(), owns);
|
|
|
|
// There are several cases where source compression is not a good idea:
|
|
// - If the script is tiny, then compression will save little or no space.
|
|
// - If the script is enormous, then decompression can take seconds. With
|
|
// lazy parsing, decompression is not uncommon, so this can significantly
|
|
// increase latency.
|
|
// - If there is only one core, then compression will contend with JS
|
|
// execution (which hurts benchmarketing).
|
|
// - If the source contains a giant string, then parsing will finish much
|
|
// faster than compression which increases latency (this case is handled
|
|
// in Parser::stringLiteral).
|
|
//
|
|
// Lastly, since the parsing thread will eventually perform a blocking wait
|
|
// on the compression task's thread, require that there are at least 2
|
|
// helper threads:
|
|
// - If we are on a helper thread, there must be another helper thread to
|
|
// execute our compression task.
|
|
// - If we are on the main thread, there must be at least two helper
|
|
// threads since at most one helper thread can be blocking on the main
|
|
// thread (see HelperThreadState::canStartParseTask) which would cause a
|
|
// deadlock if there wasn't a second helper thread that could make
|
|
// progress on our compression task.
|
|
bool canCompressOffThread =
|
|
HelperThreadState().cpuCount > 1 &&
|
|
HelperThreadState().threadCount >= 2 &&
|
|
CanUseExtraThreads();
|
|
const size_t TINY_SCRIPT = 256;
|
|
const size_t HUGE_SCRIPT = 5 * 1024 * 1024;
|
|
if (TINY_SCRIPT <= srcBuf.length() && srcBuf.length() < HUGE_SCRIPT && canCompressOffThread) {
|
|
task->ss = this;
|
|
if (!StartOffThreadCompression(cx, task))
|
|
return false;
|
|
} else if (!ensureOwnsSource(cx)) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
SourceCompressionTask::ResultType
|
|
SourceCompressionTask::work()
|
|
{
|
|
// Try to keep the maximum memory usage down by only allocating half the
|
|
// size of the string, first.
|
|
size_t inputBytes = ss->length() * sizeof(char16_t);
|
|
size_t firstSize = inputBytes / 2;
|
|
compressed = js_malloc(firstSize);
|
|
if (!compressed)
|
|
return OOM;
|
|
|
|
Compressor comp(reinterpret_cast<const unsigned char*>(ss->uncompressedChars()), inputBytes);
|
|
if (!comp.init())
|
|
return OOM;
|
|
|
|
comp.setOutput((unsigned char*) compressed, firstSize);
|
|
bool cont = true;
|
|
while (cont) {
|
|
if (abort_)
|
|
return Aborted;
|
|
|
|
switch (comp.compressMore()) {
|
|
case Compressor::CONTINUE:
|
|
break;
|
|
case Compressor::MOREOUTPUT: {
|
|
if (comp.outWritten() == inputBytes) {
|
|
// The compressed string is longer than the original string.
|
|
return Aborted;
|
|
}
|
|
|
|
// The compressed output is greater than half the size of the
|
|
// original string. Reallocate to the full size.
|
|
compressed = js_realloc(compressed, inputBytes);
|
|
if (!compressed)
|
|
return OOM;
|
|
|
|
comp.setOutput((unsigned char*) compressed, inputBytes);
|
|
break;
|
|
}
|
|
case Compressor::DONE:
|
|
cont = false;
|
|
break;
|
|
case Compressor::OOM:
|
|
return OOM;
|
|
}
|
|
}
|
|
compressedBytes = comp.outWritten();
|
|
compressedHash = CompressedSourceHasher::computeHash(compressed, compressedBytes);
|
|
|
|
// Shrink the buffer to the size of the compressed data.
|
|
if (void* newCompressed = js_realloc(compressed, compressedBytes))
|
|
compressed = newCompressed;
|
|
|
|
return Success;
|
|
}
|
|
|
|
ScriptSource::~ScriptSource()
|
|
{
|
|
MOZ_ASSERT_IF(inCompressedSourceSet, dataType == DataCompressed);
|
|
|
|
switch (dataType) {
|
|
case DataUncompressed:
|
|
if (ownsUncompressedChars())
|
|
js_free(const_cast<char16_t*>(uncompressedChars()));
|
|
break;
|
|
|
|
case DataCompressed:
|
|
// Script source references are only manipulated on the main thread,
|
|
// except during off thread parsing when the source may be created
|
|
// and used exclusively by the thread doing the parse. In this case the
|
|
// ScriptSource might be destroyed while off the main thread, but it
|
|
// will not have been added to the runtime's compressed source set
|
|
// until the parse is finished on the main thread.
|
|
if (inCompressedSourceSet)
|
|
TlsPerThreadData.get()->runtimeFromMainThread()->compressedSourceSet.remove(this);
|
|
js_free(compressedData());
|
|
break;
|
|
|
|
case DataParent:
|
|
parent()->decref();
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
ScriptSource::addSizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf,
|
|
JS::ScriptSourceInfo* info) const
|
|
{
|
|
if (dataType == DataUncompressed && ownsUncompressedChars())
|
|
info->uncompressed += mallocSizeOf(uncompressedChars());
|
|
else if (dataType == DataCompressed)
|
|
info->compressed += mallocSizeOf(compressedData());
|
|
info->misc += mallocSizeOf(this) +
|
|
mallocSizeOf(filename_.get()) +
|
|
mallocSizeOf(introducerFilename_.get());
|
|
info->numScripts++;
|
|
}
|
|
|
|
template<XDRMode mode>
|
|
bool
|
|
ScriptSource::performXDR(XDRState<mode>* xdr)
|
|
{
|
|
uint8_t hasSource = hasSourceData();
|
|
if (!xdr->codeUint8(&hasSource))
|
|
return false;
|
|
|
|
uint8_t retrievable = sourceRetrievable_;
|
|
if (!xdr->codeUint8(&retrievable))
|
|
return false;
|
|
sourceRetrievable_ = retrievable;
|
|
|
|
if (hasSource && !sourceRetrievable_) {
|
|
if (!xdr->codeUint32(&length_))
|
|
return false;
|
|
|
|
uint32_t compressedLength;
|
|
if (mode == XDR_ENCODE) {
|
|
switch (dataType) {
|
|
case DataUncompressed:
|
|
compressedLength = 0;
|
|
break;
|
|
case DataCompressed:
|
|
compressedLength = compressedBytes();
|
|
break;
|
|
case DataParent:
|
|
compressedLength = parent()->compressedBytes();
|
|
break;
|
|
default:
|
|
MOZ_CRASH();
|
|
}
|
|
}
|
|
if (!xdr->codeUint32(&compressedLength))
|
|
return false;
|
|
|
|
{
|
|
uint8_t argumentsNotIncluded;
|
|
if (mode == XDR_ENCODE)
|
|
argumentsNotIncluded = argumentsNotIncluded_;
|
|
if (!xdr->codeUint8(&argumentsNotIncluded))
|
|
return false;
|
|
if (mode == XDR_DECODE)
|
|
argumentsNotIncluded_ = argumentsNotIncluded;
|
|
}
|
|
|
|
size_t byteLen = compressedLength ? compressedLength : (length_ * sizeof(char16_t));
|
|
if (mode == XDR_DECODE) {
|
|
uint8_t* p = xdr->cx()->template pod_malloc<uint8_t>(Max<size_t>(byteLen, 1));
|
|
if (!p || !xdr->codeBytes(p, byteLen)) {
|
|
js_free(p);
|
|
return false;
|
|
}
|
|
|
|
if (compressedLength)
|
|
setCompressedSource(xdr->cx()->runtime(), p, compressedLength,
|
|
CompressedSourceHasher::computeHash(p, compressedLength));
|
|
else
|
|
setSource((const char16_t*) p, length_);
|
|
} else {
|
|
void* p;
|
|
switch (dataType) {
|
|
case DataUncompressed:
|
|
p = (void*) uncompressedChars();
|
|
break;
|
|
case DataCompressed:
|
|
p = compressedData();
|
|
break;
|
|
case DataParent:
|
|
p = parent()->compressedData();
|
|
break;
|
|
default:
|
|
MOZ_CRASH();
|
|
}
|
|
if (!xdr->codeBytes(p, byteLen))
|
|
return false;
|
|
}
|
|
}
|
|
|
|
uint8_t haveSourceMap = hasSourceMapURL();
|
|
if (!xdr->codeUint8(&haveSourceMap))
|
|
return false;
|
|
|
|
if (haveSourceMap) {
|
|
uint32_t sourceMapURLLen = (mode == XDR_DECODE) ? 0 : js_strlen(sourceMapURL_.get());
|
|
if (!xdr->codeUint32(&sourceMapURLLen))
|
|
return false;
|
|
|
|
if (mode == XDR_DECODE) {
|
|
sourceMapURL_ = xdr->cx()->template make_pod_array<char16_t>(sourceMapURLLen + 1);
|
|
if (!sourceMapURL_)
|
|
return false;
|
|
}
|
|
if (!xdr->codeChars(sourceMapURL_.get(), sourceMapURLLen)) {
|
|
if (mode == XDR_DECODE)
|
|
sourceMapURL_ = nullptr;
|
|
return false;
|
|
}
|
|
sourceMapURL_[sourceMapURLLen] = '\0';
|
|
}
|
|
|
|
uint8_t haveDisplayURL = hasDisplayURL();
|
|
if (!xdr->codeUint8(&haveDisplayURL))
|
|
return false;
|
|
|
|
if (haveDisplayURL) {
|
|
uint32_t displayURLLen = (mode == XDR_DECODE) ? 0 : js_strlen(displayURL_.get());
|
|
if (!xdr->codeUint32(&displayURLLen))
|
|
return false;
|
|
|
|
if (mode == XDR_DECODE) {
|
|
displayURL_ = xdr->cx()->template make_pod_array<char16_t>(displayURLLen + 1);
|
|
if (!displayURL_)
|
|
return false;
|
|
}
|
|
if (!xdr->codeChars(displayURL_.get(), displayURLLen)) {
|
|
if (mode == XDR_DECODE)
|
|
displayURL_ = nullptr;
|
|
return false;
|
|
}
|
|
displayURL_[displayURLLen] = '\0';
|
|
}
|
|
|
|
uint8_t haveFilename = !!filename_;
|
|
if (!xdr->codeUint8(&haveFilename))
|
|
return false;
|
|
|
|
if (haveFilename) {
|
|
const char* fn = filename();
|
|
if (!xdr->codeCString(&fn))
|
|
return false;
|
|
if (mode == XDR_DECODE && !setFilename(xdr->cx(), fn))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// Format and return a cx->zone()->pod_malloc'ed URL for a generated script like:
|
|
// {filename} line {lineno} > {introducer}
|
|
// For example:
|
|
// foo.js line 7 > eval
|
|
// indicating code compiled by the call to 'eval' on line 7 of foo.js.
|
|
static char*
|
|
FormatIntroducedFilename(ExclusiveContext* cx, const char* filename, unsigned lineno,
|
|
const char* introducer)
|
|
{
|
|
// Compute the length of the string in advance, so we can allocate a
|
|
// buffer of the right size on the first shot.
|
|
//
|
|
// (JS_smprintf would be perfect, as that allocates the result
|
|
// dynamically as it formats the string, but it won't allocate from cx,
|
|
// and wants us to use a special free function.)
|
|
char linenoBuf[15];
|
|
size_t filenameLen = strlen(filename);
|
|
size_t linenoLen = JS_snprintf(linenoBuf, 15, "%u", lineno);
|
|
size_t introducerLen = strlen(introducer);
|
|
size_t len = filenameLen +
|
|
6 /* == strlen(" line ") */ +
|
|
linenoLen +
|
|
3 /* == strlen(" > ") */ +
|
|
introducerLen +
|
|
1 /* \0 */;
|
|
char* formatted = cx->zone()->pod_malloc<char>(len);
|
|
if (!formatted) {
|
|
ReportOutOfMemory(cx);
|
|
return nullptr;
|
|
}
|
|
mozilla::DebugOnly<size_t> checkLen = JS_snprintf(formatted, len, "%s line %s > %s",
|
|
filename, linenoBuf, introducer);
|
|
MOZ_ASSERT(checkLen == len - 1);
|
|
|
|
return formatted;
|
|
}
|
|
|
|
bool
|
|
ScriptSource::initFromOptions(ExclusiveContext* cx, const ReadOnlyCompileOptions& options)
|
|
{
|
|
MOZ_ASSERT(!filename_);
|
|
MOZ_ASSERT(!introducerFilename_);
|
|
|
|
mutedErrors_ = options.mutedErrors();
|
|
|
|
introductionType_ = options.introductionType;
|
|
setIntroductionOffset(options.introductionOffset);
|
|
|
|
if (options.hasIntroductionInfo) {
|
|
MOZ_ASSERT(options.introductionType != nullptr);
|
|
const char* filename = options.filename() ? options.filename() : "<unknown>";
|
|
char* formatted = FormatIntroducedFilename(cx, filename, options.introductionLineno,
|
|
options.introductionType);
|
|
if (!formatted)
|
|
return false;
|
|
filename_.reset(formatted);
|
|
} else if (options.filename()) {
|
|
if (!setFilename(cx, options.filename()))
|
|
return false;
|
|
}
|
|
|
|
if (options.introducerFilename()) {
|
|
introducerFilename_ = DuplicateString(cx, options.introducerFilename());
|
|
if (!introducerFilename_)
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
ScriptSource::setFilename(ExclusiveContext* cx, const char* filename)
|
|
{
|
|
MOZ_ASSERT(!filename_);
|
|
filename_ = DuplicateString(cx, filename);
|
|
return filename_ != nullptr;
|
|
}
|
|
|
|
bool
|
|
ScriptSource::setDisplayURL(ExclusiveContext* cx, const char16_t* displayURL)
|
|
{
|
|
MOZ_ASSERT(displayURL);
|
|
if (hasDisplayURL()) {
|
|
if (cx->isJSContext() &&
|
|
!JS_ReportErrorFlagsAndNumber(cx->asJSContext(), JSREPORT_WARNING,
|
|
GetErrorMessage, nullptr,
|
|
JSMSG_ALREADY_HAS_PRAGMA, filename_.get(),
|
|
"//# sourceURL"))
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
size_t len = js_strlen(displayURL) + 1;
|
|
if (len == 1)
|
|
return true;
|
|
|
|
displayURL_ = DuplicateString(cx, displayURL);
|
|
return displayURL_ != nullptr;
|
|
}
|
|
|
|
bool
|
|
ScriptSource::setSourceMapURL(ExclusiveContext* cx, const char16_t* sourceMapURL)
|
|
{
|
|
MOZ_ASSERT(sourceMapURL);
|
|
|
|
size_t len = js_strlen(sourceMapURL) + 1;
|
|
if (len == 1)
|
|
return true;
|
|
|
|
sourceMapURL_ = DuplicateString(cx, sourceMapURL);
|
|
return sourceMapURL_ != nullptr;
|
|
}
|
|
|
|
size_t
|
|
ScriptSource::computedSizeOfData() const
|
|
{
|
|
if (dataType == DataUncompressed && ownsUncompressedChars())
|
|
return sizeof(char16_t) * length_;
|
|
if (dataType == DataCompressed)
|
|
return compressedBytes();
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Shared script data management.
|
|
*/
|
|
|
|
SharedScriptData*
|
|
js::SharedScriptData::new_(ExclusiveContext* cx, uint32_t codeLength,
|
|
uint32_t srcnotesLength, uint32_t natoms)
|
|
{
|
|
/*
|
|
* Ensure the atoms are aligned, as some architectures don't allow unaligned
|
|
* access.
|
|
*/
|
|
const uint32_t pointerSize = sizeof(JSAtom*);
|
|
const uint32_t pointerMask = pointerSize - 1;
|
|
const uint32_t dataOffset = offsetof(SharedScriptData, data);
|
|
uint32_t baseLength = codeLength + srcnotesLength;
|
|
uint32_t padding = (pointerSize - ((baseLength + dataOffset) & pointerMask)) & pointerMask;
|
|
uint32_t length = baseLength + padding + pointerSize * natoms;
|
|
|
|
SharedScriptData* entry = reinterpret_cast<SharedScriptData*>(
|
|
cx->zone()->pod_malloc<uint8_t>(length + dataOffset));
|
|
if (!entry) {
|
|
ReportOutOfMemory(cx);
|
|
return nullptr;
|
|
}
|
|
|
|
entry->length = length;
|
|
entry->natoms = natoms;
|
|
entry->marked = false;
|
|
memset(entry->data + baseLength, 0, padding);
|
|
|
|
/*
|
|
* Call constructors to initialize the storage that will be accessed as a
|
|
* HeapPtrAtom array via atoms().
|
|
*/
|
|
HeapPtrAtom* atoms = entry->atoms();
|
|
MOZ_ASSERT(reinterpret_cast<uintptr_t>(atoms) % sizeof(JSAtom*) == 0);
|
|
for (unsigned i = 0; i < natoms; ++i)
|
|
new (&atoms[i]) HeapPtrAtom();
|
|
|
|
return entry;
|
|
}
|
|
|
|
/*
|
|
* Takes ownership of its *ssd parameter and either adds it into the runtime's
|
|
* ScriptDataTable or frees it if a matching entry already exists.
|
|
*
|
|
* Sets the |code| and |atoms| fields on the given JSScript.
|
|
*/
|
|
static bool
|
|
SaveSharedScriptData(ExclusiveContext* cx, Handle<JSScript*> script, SharedScriptData* ssd,
|
|
uint32_t nsrcnotes)
|
|
{
|
|
MOZ_ASSERT(script != nullptr);
|
|
MOZ_ASSERT(ssd != nullptr);
|
|
|
|
AutoLockForExclusiveAccess lock(cx);
|
|
|
|
ScriptBytecodeHasher::Lookup l(ssd);
|
|
|
|
ScriptDataTable::AddPtr p = cx->scriptDataTable().lookupForAdd(l);
|
|
if (p) {
|
|
js_free(ssd);
|
|
ssd = *p;
|
|
} else {
|
|
if (!cx->scriptDataTable().add(p, ssd)) {
|
|
script->setCode(nullptr);
|
|
script->atoms = nullptr;
|
|
js_free(ssd);
|
|
ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* During the IGC we need to ensure that bytecode is marked whenever it is
|
|
* accessed even if the bytecode was already in the table: at this point
|
|
* old scripts or exceptions pointing to the bytecode may no longer be
|
|
* reachable. This is effectively a read barrier.
|
|
*/
|
|
if (cx->isJSContext()) {
|
|
JSRuntime* rt = cx->asJSContext()->runtime();
|
|
if (JS::IsIncrementalGCInProgress(rt) && rt->gc.isFullGc())
|
|
ssd->marked = true;
|
|
}
|
|
|
|
script->setCode(ssd->data);
|
|
script->atoms = ssd->atoms();
|
|
return true;
|
|
}
|
|
|
|
static inline void
|
|
MarkScriptData(JSRuntime* rt, const jsbytecode* bytecode)
|
|
{
|
|
/*
|
|
* As an invariant, a ScriptBytecodeEntry should not be 'marked' outside of
|
|
* a GC. Since SweepScriptBytecodes is only called during a full gc,
|
|
* to preserve this invariant, only mark during a full gc.
|
|
*/
|
|
if (rt->gc.isFullGc())
|
|
SharedScriptData::fromBytecode(bytecode)->marked = true;
|
|
}
|
|
|
|
void
|
|
js::UnmarkScriptData(JSRuntime* rt)
|
|
{
|
|
MOZ_ASSERT(rt->gc.isFullGc());
|
|
ScriptDataTable& table = rt->scriptDataTable();
|
|
for (ScriptDataTable::Enum e(table); !e.empty(); e.popFront()) {
|
|
SharedScriptData* entry = e.front();
|
|
entry->marked = false;
|
|
}
|
|
}
|
|
|
|
void
|
|
js::SweepScriptData(JSRuntime* rt)
|
|
{
|
|
MOZ_ASSERT(rt->gc.isFullGc());
|
|
ScriptDataTable& table = rt->scriptDataTable();
|
|
|
|
if (rt->keepAtoms())
|
|
return;
|
|
|
|
for (ScriptDataTable::Enum e(table); !e.empty(); e.popFront()) {
|
|
SharedScriptData* entry = e.front();
|
|
if (!entry->marked) {
|
|
js_free(entry);
|
|
e.removeFront();
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
js::FreeScriptData(JSRuntime* rt)
|
|
{
|
|
ScriptDataTable& table = rt->scriptDataTable();
|
|
if (!table.initialized())
|
|
return;
|
|
|
|
for (ScriptDataTable::Enum e(table); !e.empty(); e.popFront())
|
|
js_free(e.front());
|
|
|
|
table.clear();
|
|
}
|
|
|
|
/*
|
|
* JSScript::data and SharedScriptData::data have complex,
|
|
* manually-controlled, memory layouts.
|
|
*
|
|
* JSScript::data begins with some optional array headers. They are optional
|
|
* because they often aren't needed, i.e. the corresponding arrays often have
|
|
* zero elements. Each header has a bit in JSScript::hasArrayBits that
|
|
* indicates if it's present within |data|; from this the offset of each
|
|
* present array header can be computed. Each header has an accessor function
|
|
* in JSScript that encapsulates this offset computation.
|
|
*
|
|
* Array type Array elements Accessor
|
|
* ---------- -------------- --------
|
|
* ConstArray Consts consts()
|
|
* ObjectArray Objects objects()
|
|
* ObjectArray Regexps regexps()
|
|
* TryNoteArray Try notes trynotes()
|
|
* BlockScopeArray Scope notes blockScopes()
|
|
*
|
|
* Then are the elements of several arrays.
|
|
* - Most of these arrays have headers listed above (if present). For each of
|
|
* these, the array pointer and the array length is stored in the header.
|
|
* - The remaining arrays have pointers and lengths that are stored directly in
|
|
* JSScript. This is because, unlike the others, they are nearly always
|
|
* non-zero length and so the optional-header space optimization isn't
|
|
* worthwhile.
|
|
*
|
|
* Array elements Pointed to by Length
|
|
* -------------- ------------- ------
|
|
* Consts consts()->vector consts()->length
|
|
* Objects objects()->vector objects()->length
|
|
* Regexps regexps()->vector regexps()->length
|
|
* Try notes trynotes()->vector trynotes()->length
|
|
* Scope notes blockScopes()->vector blockScopes()->length
|
|
*
|
|
* IMPORTANT: This layout has two key properties.
|
|
* - It ensures that everything has sufficient alignment; in particular, the
|
|
* consts() elements need Value alignment.
|
|
* - It ensures there are no gaps between elements, which saves space and makes
|
|
* manual layout easy. In particular, in the second part, arrays with larger
|
|
* elements precede arrays with smaller elements.
|
|
*
|
|
* SharedScriptData::data contains data that can be shared within a
|
|
* runtime. These items' layout is manually controlled to make it easier to
|
|
* manage both during (temporary) allocation and during matching against
|
|
* existing entries in the runtime. As the jsbytecode has to come first to
|
|
* enable lookup by bytecode identity, SharedScriptData::data, the atoms part
|
|
* has to manually be aligned sufficiently by adding padding after the notes
|
|
* part.
|
|
*
|
|
* Array elements Pointed to by Length
|
|
* -------------- ------------- ------
|
|
* jsbytecode code length
|
|
* jsscrnote notes() numNotes()
|
|
* Atoms atoms natoms
|
|
*
|
|
* The following static assertions check JSScript::data's alignment properties.
|
|
*/
|
|
|
|
#define KEEPS_JSVAL_ALIGNMENT(T) \
|
|
(JS_ALIGNMENT_OF(JS::Value) % JS_ALIGNMENT_OF(T) == 0 && \
|
|
sizeof(T) % sizeof(JS::Value) == 0)
|
|
|
|
#define HAS_JSVAL_ALIGNMENT(T) \
|
|
(JS_ALIGNMENT_OF(JS::Value) == JS_ALIGNMENT_OF(T) && \
|
|
sizeof(T) == sizeof(JS::Value))
|
|
|
|
#define NO_PADDING_BETWEEN_ENTRIES(T1, T2) \
|
|
(JS_ALIGNMENT_OF(T1) % JS_ALIGNMENT_OF(T2) == 0)
|
|
|
|
/*
|
|
* These assertions ensure that there is no padding between the array headers,
|
|
* and also that the consts() elements (which follow immediately afterward) are
|
|
* Value-aligned. (There is an assumption that |data| itself is Value-aligned;
|
|
* we check this below).
|
|
*/
|
|
JS_STATIC_ASSERT(KEEPS_JSVAL_ALIGNMENT(ConstArray));
|
|
JS_STATIC_ASSERT(KEEPS_JSVAL_ALIGNMENT(ObjectArray)); /* there are two of these */
|
|
JS_STATIC_ASSERT(KEEPS_JSVAL_ALIGNMENT(TryNoteArray));
|
|
JS_STATIC_ASSERT(KEEPS_JSVAL_ALIGNMENT(BlockScopeArray));
|
|
|
|
/* These assertions ensure there is no padding required between array elements. */
|
|
JS_STATIC_ASSERT(HAS_JSVAL_ALIGNMENT(HeapValue));
|
|
JS_STATIC_ASSERT(NO_PADDING_BETWEEN_ENTRIES(HeapValue, HeapPtrObject));
|
|
JS_STATIC_ASSERT(NO_PADDING_BETWEEN_ENTRIES(HeapPtrObject, HeapPtrObject));
|
|
JS_STATIC_ASSERT(NO_PADDING_BETWEEN_ENTRIES(HeapPtrObject, JSTryNote));
|
|
JS_STATIC_ASSERT(NO_PADDING_BETWEEN_ENTRIES(JSTryNote, uint32_t));
|
|
JS_STATIC_ASSERT(NO_PADDING_BETWEEN_ENTRIES(uint32_t, uint32_t));
|
|
|
|
JS_STATIC_ASSERT(NO_PADDING_BETWEEN_ENTRIES(HeapValue, BlockScopeNote));
|
|
JS_STATIC_ASSERT(NO_PADDING_BETWEEN_ENTRIES(BlockScopeNote, BlockScopeNote));
|
|
JS_STATIC_ASSERT(NO_PADDING_BETWEEN_ENTRIES(JSTryNote, BlockScopeNote));
|
|
JS_STATIC_ASSERT(NO_PADDING_BETWEEN_ENTRIES(HeapPtrObject, BlockScopeNote));
|
|
JS_STATIC_ASSERT(NO_PADDING_BETWEEN_ENTRIES(BlockScopeNote, uint32_t));
|
|
|
|
static inline size_t
|
|
ScriptDataSize(uint32_t nbindings, uint32_t nconsts, uint32_t nobjects, uint32_t nregexps,
|
|
uint32_t ntrynotes, uint32_t nblockscopes, uint32_t nyieldoffsets)
|
|
{
|
|
size_t size = 0;
|
|
|
|
if (nconsts != 0)
|
|
size += sizeof(ConstArray) + nconsts * sizeof(Value);
|
|
if (nobjects != 0)
|
|
size += sizeof(ObjectArray) + nobjects * sizeof(NativeObject*);
|
|
if (nregexps != 0)
|
|
size += sizeof(ObjectArray) + nregexps * sizeof(NativeObject*);
|
|
if (ntrynotes != 0)
|
|
size += sizeof(TryNoteArray) + ntrynotes * sizeof(JSTryNote);
|
|
if (nblockscopes != 0)
|
|
size += sizeof(BlockScopeArray) + nblockscopes * sizeof(BlockScopeNote);
|
|
if (nyieldoffsets != 0)
|
|
size += sizeof(YieldOffsetArray) + nyieldoffsets * sizeof(uint32_t);
|
|
|
|
if (nbindings != 0) {
|
|
// Make sure bindings are sufficiently aligned.
|
|
size = JS_ROUNDUP(size, JS_ALIGNMENT_OF(Binding)) + nbindings * sizeof(Binding);
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
void
|
|
JSScript::initCompartment(ExclusiveContext* cx)
|
|
{
|
|
compartment_ = cx->compartment_;
|
|
}
|
|
|
|
/* static */ JSScript*
|
|
JSScript::Create(ExclusiveContext* cx, HandleObject enclosingScope, bool savedCallerFun,
|
|
const ReadOnlyCompileOptions& options, HandleObject sourceObject,
|
|
uint32_t bufStart, uint32_t bufEnd)
|
|
{
|
|
MOZ_ASSERT(bufStart <= bufEnd);
|
|
|
|
RootedScript script(cx, Allocate<JSScript>(cx));
|
|
if (!script)
|
|
return nullptr;
|
|
|
|
PodZero(script.get());
|
|
new (&script->bindings) Bindings;
|
|
|
|
script->enclosingStaticScope_ = enclosingScope;
|
|
script->savedCallerFun_ = savedCallerFun;
|
|
script->initCompartment(cx);
|
|
|
|
script->selfHosted_ = options.selfHostingMode;
|
|
script->noScriptRval_ = options.noScriptRval;
|
|
script->treatAsRunOnce_ = options.isRunOnce;
|
|
|
|
// Compute whether this script is under a non-syntactic scope. We don't
|
|
// need to walk the entire static scope chain if the script is nested in a
|
|
// function. In that case, we can propagate the cached value from the
|
|
// outer script.
|
|
script->hasNonSyntacticScope_ = HasNonSyntacticStaticScopeChain(enclosingScope);
|
|
|
|
script->version = options.version;
|
|
MOZ_ASSERT(script->getVersion() == options.version); // assert that no overflow occurred
|
|
|
|
script->setSourceObject(sourceObject);
|
|
script->sourceStart_ = bufStart;
|
|
script->sourceEnd_ = bufEnd;
|
|
|
|
return script;
|
|
}
|
|
|
|
static inline uint8_t*
|
|
AllocScriptData(JS::Zone* zone, size_t size)
|
|
{
|
|
if (!size)
|
|
return nullptr;
|
|
|
|
uint8_t* data = zone->pod_calloc<uint8_t>(JS_ROUNDUP(size, sizeof(Value)));
|
|
if (!data)
|
|
return nullptr;
|
|
MOZ_ASSERT(size_t(data) % sizeof(Value) == 0);
|
|
return data;
|
|
}
|
|
|
|
/* static */ bool
|
|
JSScript::partiallyInit(ExclusiveContext* cx, HandleScript script, uint32_t nconsts,
|
|
uint32_t nobjects, uint32_t nregexps, uint32_t ntrynotes,
|
|
uint32_t nblockscopes, uint32_t nyieldoffsets, uint32_t nTypeSets)
|
|
{
|
|
size_t size = ScriptDataSize(script->bindings.count(), nconsts, nobjects, nregexps, ntrynotes,
|
|
nblockscopes, nyieldoffsets);
|
|
script->data = AllocScriptData(script->zone(), size);
|
|
if (size && !script->data) {
|
|
ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
script->dataSize_ = size;
|
|
|
|
MOZ_ASSERT(nTypeSets <= UINT16_MAX);
|
|
script->nTypeSets_ = uint16_t(nTypeSets);
|
|
|
|
uint8_t* cursor = script->data;
|
|
if (nconsts != 0) {
|
|
script->setHasArray(CONSTS);
|
|
cursor += sizeof(ConstArray);
|
|
}
|
|
if (nobjects != 0) {
|
|
script->setHasArray(OBJECTS);
|
|
cursor += sizeof(ObjectArray);
|
|
}
|
|
if (nregexps != 0) {
|
|
script->setHasArray(REGEXPS);
|
|
cursor += sizeof(ObjectArray);
|
|
}
|
|
if (ntrynotes != 0) {
|
|
script->setHasArray(TRYNOTES);
|
|
cursor += sizeof(TryNoteArray);
|
|
}
|
|
if (nblockscopes != 0) {
|
|
script->setHasArray(BLOCK_SCOPES);
|
|
cursor += sizeof(BlockScopeArray);
|
|
}
|
|
|
|
YieldOffsetArray* yieldOffsets = nullptr;
|
|
if (nyieldoffsets != 0) {
|
|
yieldOffsets = reinterpret_cast<YieldOffsetArray*>(cursor);
|
|
cursor += sizeof(YieldOffsetArray);
|
|
}
|
|
|
|
if (nconsts != 0) {
|
|
MOZ_ASSERT(reinterpret_cast<uintptr_t>(cursor) % sizeof(JS::Value) == 0);
|
|
script->consts()->length = nconsts;
|
|
script->consts()->vector = (HeapValue*)cursor;
|
|
cursor += nconsts * sizeof(script->consts()->vector[0]);
|
|
}
|
|
|
|
if (nobjects != 0) {
|
|
script->objects()->length = nobjects;
|
|
script->objects()->vector = (HeapPtrObject*)cursor;
|
|
cursor += nobjects * sizeof(script->objects()->vector[0]);
|
|
}
|
|
|
|
if (nregexps != 0) {
|
|
script->regexps()->length = nregexps;
|
|
script->regexps()->vector = (HeapPtrObject*)cursor;
|
|
cursor += nregexps * sizeof(script->regexps()->vector[0]);
|
|
}
|
|
|
|
if (ntrynotes != 0) {
|
|
script->trynotes()->length = ntrynotes;
|
|
script->trynotes()->vector = reinterpret_cast<JSTryNote*>(cursor);
|
|
size_t vectorSize = ntrynotes * sizeof(script->trynotes()->vector[0]);
|
|
#ifdef DEBUG
|
|
memset(cursor, 0, vectorSize);
|
|
#endif
|
|
cursor += vectorSize;
|
|
}
|
|
|
|
if (nblockscopes != 0) {
|
|
script->blockScopes()->length = nblockscopes;
|
|
script->blockScopes()->vector = reinterpret_cast<BlockScopeNote*>(cursor);
|
|
size_t vectorSize = nblockscopes * sizeof(script->blockScopes()->vector[0]);
|
|
#ifdef DEBUG
|
|
memset(cursor, 0, vectorSize);
|
|
#endif
|
|
cursor += vectorSize;
|
|
}
|
|
|
|
if (nyieldoffsets != 0) {
|
|
yieldOffsets->init(reinterpret_cast<uint32_t*>(cursor), nyieldoffsets);
|
|
size_t vectorSize = nyieldoffsets * sizeof(script->yieldOffsets()[0]);
|
|
#ifdef DEBUG
|
|
memset(cursor, 0, vectorSize);
|
|
#endif
|
|
cursor += vectorSize;
|
|
}
|
|
|
|
if (script->bindings.count() != 0) {
|
|
// Make sure bindings are sufficiently aligned.
|
|
cursor = reinterpret_cast<uint8_t*>
|
|
(JS_ROUNDUP(reinterpret_cast<uintptr_t>(cursor), JS_ALIGNMENT_OF(Binding)));
|
|
}
|
|
cursor = script->bindings.switchToScriptStorage(reinterpret_cast<Binding*>(cursor));
|
|
|
|
MOZ_ASSERT(cursor == script->data + size);
|
|
return true;
|
|
}
|
|
|
|
/* static */ bool
|
|
JSScript::fullyInitTrivial(ExclusiveContext* cx, Handle<JSScript*> script)
|
|
{
|
|
if (!script->bindings.initTrivial(cx))
|
|
return false;
|
|
|
|
if (!partiallyInit(cx, script, 0, 0, 0, 0, 0, 0, 0))
|
|
return false;
|
|
|
|
SharedScriptData* ssd = SharedScriptData::new_(cx, 1, 1, 0);
|
|
if (!ssd)
|
|
return false;
|
|
|
|
ssd->data[0] = JSOP_RETRVAL;
|
|
ssd->data[1] = SRC_NULL;
|
|
script->setLength(1);
|
|
return SaveSharedScriptData(cx, script, ssd, 1);
|
|
}
|
|
|
|
/* static */ void
|
|
JSScript::linkToFunctionFromEmitter(js::ExclusiveContext* cx, JS::Handle<JSScript*> script,
|
|
js::frontend::FunctionBox* funbox)
|
|
{
|
|
script->funHasExtensibleScope_ = funbox->hasExtensibleScope();
|
|
script->funNeedsDeclEnvObject_ = funbox->needsDeclEnvObject();
|
|
script->needsHomeObject_ = funbox->needsHomeObject();
|
|
script->isDerivedClassConstructor_ = funbox->isDerivedClassConstructor();
|
|
|
|
if (funbox->argumentsHasLocalBinding()) {
|
|
script->setArgumentsHasVarBinding();
|
|
if (funbox->definitelyNeedsArgsObj())
|
|
script->setNeedsArgsObj(true);
|
|
} else {
|
|
MOZ_ASSERT(!funbox->definitelyNeedsArgsObj());
|
|
}
|
|
script->hasMappedArgsObj_ = funbox->hasMappedArgsObj();
|
|
|
|
script->functionHasThisBinding_ = funbox->hasThisBinding();
|
|
|
|
script->funLength_ = funbox->length;
|
|
|
|
script->isGeneratorExp_ = funbox->inGenexpLambda;
|
|
script->setGeneratorKind(funbox->generatorKind());
|
|
|
|
// Link the function and the script to each other, so that StaticScopeIter
|
|
// may walk the scope chain of currently compiling scripts.
|
|
RootedFunction fun(cx, funbox->function());
|
|
MOZ_ASSERT(fun->isInterpreted());
|
|
|
|
script->setFunction(fun);
|
|
|
|
if (fun->isInterpretedLazy())
|
|
fun->setUnlazifiedScript(script);
|
|
else
|
|
fun->setScript(script);
|
|
}
|
|
|
|
/* static */ void
|
|
JSScript::linkToModuleFromEmitter(js::ExclusiveContext* cx, JS::Handle<JSScript*> script,
|
|
js::frontend::ModuleBox* modulebox)
|
|
{
|
|
script->funHasExtensibleScope_ = false;
|
|
script->funNeedsDeclEnvObject_ = false;
|
|
script->needsHomeObject_ = false;
|
|
script->isDerivedClassConstructor_ = false;
|
|
script->funLength_ = 0;
|
|
|
|
script->isGeneratorExp_ = false;
|
|
script->setGeneratorKind(NotGenerator);
|
|
|
|
// Link the module and the script to each other, so that StaticScopeIter
|
|
// may walk the scope chain of currently compiling scripts.
|
|
RootedModuleObject module(cx, modulebox->module());
|
|
script->setModule(module);
|
|
}
|
|
|
|
/* static */ bool
|
|
JSScript::fullyInitFromEmitter(ExclusiveContext* cx, HandleScript script, BytecodeEmitter* bce)
|
|
{
|
|
/* The counts of indexed things must be checked during code generation. */
|
|
MOZ_ASSERT(bce->atomIndices->count() <= INDEX_LIMIT);
|
|
MOZ_ASSERT(bce->objectList.length <= INDEX_LIMIT);
|
|
MOZ_ASSERT(bce->regexpList.length <= INDEX_LIMIT);
|
|
|
|
uint32_t mainLength = bce->offset();
|
|
uint32_t prologueLength = bce->prologueOffset();
|
|
uint32_t nsrcnotes;
|
|
if (!bce->finishTakingSrcNotes(&nsrcnotes))
|
|
return false;
|
|
uint32_t natoms = bce->atomIndices->count();
|
|
if (!partiallyInit(cx, script,
|
|
bce->constList.length(), bce->objectList.length, bce->regexpList.length,
|
|
bce->tryNoteList.length(), bce->blockScopeList.length(),
|
|
bce->yieldOffsetList.length(), bce->typesetCount))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
MOZ_ASSERT(script->mainOffset() == 0);
|
|
script->mainOffset_ = prologueLength;
|
|
|
|
script->lineno_ = bce->firstLine;
|
|
|
|
script->setLength(prologueLength + mainLength);
|
|
script->natoms_ = natoms;
|
|
SharedScriptData* ssd = SharedScriptData::new_(cx, script->length(), nsrcnotes, natoms);
|
|
if (!ssd)
|
|
return false;
|
|
|
|
jsbytecode* code = ssd->data;
|
|
PodCopy<jsbytecode>(code, bce->prologue.code.begin(), prologueLength);
|
|
PodCopy<jsbytecode>(code + prologueLength, bce->code().begin(), mainLength);
|
|
bce->copySrcNotes((jssrcnote*)(code + script->length()), nsrcnotes);
|
|
InitAtomMap(bce->atomIndices.getMap(), ssd->atoms());
|
|
|
|
if (!SaveSharedScriptData(cx, script, ssd, nsrcnotes))
|
|
return false;
|
|
|
|
#ifdef DEBUG
|
|
FunctionBox* funbox = bce->sc->isFunctionBox() ? bce->sc->asFunctionBox() : nullptr;
|
|
|
|
// Assert that the properties set by linkToFunctionFromEmitter are
|
|
// correct.
|
|
if (funbox) {
|
|
MOZ_ASSERT(script->funHasExtensibleScope_ == funbox->hasExtensibleScope());
|
|
MOZ_ASSERT(script->funNeedsDeclEnvObject_ == funbox->needsDeclEnvObject());
|
|
MOZ_ASSERT(script->needsHomeObject_ == funbox->needsHomeObject());
|
|
MOZ_ASSERT(script->isDerivedClassConstructor_ == funbox->isDerivedClassConstructor());
|
|
MOZ_ASSERT(script->argumentsHasVarBinding() == funbox->argumentsHasLocalBinding());
|
|
MOZ_ASSERT(script->hasMappedArgsObj() == funbox->hasMappedArgsObj());
|
|
MOZ_ASSERT(script->functionHasThisBinding() == funbox->hasThisBinding());
|
|
MOZ_ASSERT(script->functionNonDelazifying() == funbox->function());
|
|
MOZ_ASSERT(script->isGeneratorExp_ == funbox->inGenexpLambda);
|
|
MOZ_ASSERT(script->generatorKind() == funbox->generatorKind());
|
|
} else {
|
|
MOZ_ASSERT(!script->funHasExtensibleScope_);
|
|
MOZ_ASSERT(!script->funNeedsDeclEnvObject_);
|
|
MOZ_ASSERT(!script->needsHomeObject_);
|
|
MOZ_ASSERT(!script->isDerivedClassConstructor_);
|
|
MOZ_ASSERT(!script->argumentsHasVarBinding());
|
|
MOZ_ASSERT(!script->hasMappedArgsObj());
|
|
MOZ_ASSERT(!script->isGeneratorExp_);
|
|
MOZ_ASSERT(script->generatorKind() == NotGenerator);
|
|
}
|
|
#endif
|
|
|
|
if (bce->constList.length() != 0)
|
|
bce->constList.finish(script->consts());
|
|
if (bce->objectList.length != 0)
|
|
bce->objectList.finish(script->objects());
|
|
if (bce->regexpList.length != 0)
|
|
bce->regexpList.finish(script->regexps());
|
|
if (bce->tryNoteList.length() != 0)
|
|
bce->tryNoteList.finish(script->trynotes());
|
|
if (bce->blockScopeList.length() != 0)
|
|
bce->blockScopeList.finish(script->blockScopes(), prologueLength);
|
|
script->strict_ = bce->sc->strict();
|
|
script->explicitUseStrict_ = bce->sc->hasExplicitUseStrict();
|
|
script->bindingsAccessedDynamically_ = bce->sc->bindingsAccessedDynamically();
|
|
script->hasSingletons_ = bce->hasSingletons;
|
|
|
|
if (bce->yieldOffsetList.length() != 0)
|
|
bce->yieldOffsetList.finish(script->yieldOffsets(), prologueLength);
|
|
|
|
// The call to nfixed() depends on the above setFunction() call.
|
|
if (UINT32_MAX - script->nfixed() < bce->maxStackDepth) {
|
|
bce->reportError(nullptr, JSMSG_NEED_DIET, "script");
|
|
return false;
|
|
}
|
|
script->nslots_ = script->nfixed() + bce->maxStackDepth;
|
|
|
|
for (unsigned i = 0, n = script->bindings.numArgs(); i < n; ++i) {
|
|
if (script->formalIsAliased(i)) {
|
|
script->funHasAnyAliasedFormal_ = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
size_t
|
|
JSScript::computedSizeOfData() const
|
|
{
|
|
return dataSize();
|
|
}
|
|
|
|
size_t
|
|
JSScript::sizeOfData(mozilla::MallocSizeOf mallocSizeOf) const
|
|
{
|
|
return mallocSizeOf(data);
|
|
}
|
|
|
|
size_t
|
|
JSScript::sizeOfTypeScript(mozilla::MallocSizeOf mallocSizeOf) const
|
|
{
|
|
return types_->sizeOfIncludingThis(mallocSizeOf);
|
|
}
|
|
|
|
/*
|
|
* Nb: srcnotes are variable-length. This function computes the number of
|
|
* srcnote *slots*, which may be greater than the number of srcnotes.
|
|
*/
|
|
uint32_t
|
|
JSScript::numNotes()
|
|
{
|
|
jssrcnote* sn;
|
|
jssrcnote* notes_ = notes();
|
|
for (sn = notes_; !SN_IS_TERMINATOR(sn); sn = SN_NEXT(sn))
|
|
continue;
|
|
return sn - notes_ + 1; /* +1 for the terminator */
|
|
}
|
|
|
|
js::GlobalObject&
|
|
JSScript::uninlinedGlobal() const
|
|
{
|
|
return global();
|
|
}
|
|
|
|
void
|
|
JSScript::fixEnclosingStaticGlobalLexicalScope()
|
|
{
|
|
MOZ_ASSERT(IsStaticGlobalLexicalScope(enclosingStaticScope_));
|
|
enclosingStaticScope_ = &global().lexicalScope().staticBlock();
|
|
}
|
|
|
|
void
|
|
LazyScript::fixEnclosingStaticGlobalLexicalScope()
|
|
{
|
|
MOZ_ASSERT(IsStaticGlobalLexicalScope(enclosingScope_));
|
|
enclosingScope_ = &function_->global().lexicalScope().staticBlock();
|
|
}
|
|
|
|
void
|
|
JSScript::finalize(FreeOp* fop)
|
|
{
|
|
// NOTE: this JSScript may be partially initialized at this point. E.g. we
|
|
// may have created it and partially initialized it with
|
|
// JSScript::Create(), but not yet finished initializing it with
|
|
// fullyInitFromEmitter() or fullyInitTrivial().
|
|
|
|
// Collect code coverage information for this script and all its inner
|
|
// scripts, and store the aggregated information on the compartment.
|
|
if (fop->runtime()->lcovOutput.isEnabled())
|
|
compartment()->lcovOutput.collectCodeCoverageInfo(compartment(), sourceObject(), this);
|
|
|
|
fop->runtime()->spsProfiler.onScriptFinalized(this);
|
|
|
|
if (types_)
|
|
types_->destroy();
|
|
|
|
jit::DestroyJitScripts(fop, this);
|
|
|
|
destroyScriptCounts(fop);
|
|
destroyDebugScript(fop);
|
|
|
|
if (data) {
|
|
JS_POISON(data, 0xdb, computedSizeOfData());
|
|
fop->free_(data);
|
|
}
|
|
|
|
fop->runtime()->lazyScriptCache.remove(this);
|
|
|
|
// In most cases, our LazyScript's script pointer will reference this
|
|
// script, and thus be nulled out by normal weakref processing. However, if
|
|
// we unlazified the LazyScript during incremental sweeping, it will have a
|
|
// completely different JSScript.
|
|
MOZ_ASSERT_IF(lazyScript && !IsAboutToBeFinalizedUnbarriered(&lazyScript),
|
|
!lazyScript->hasScript() || lazyScript->maybeScriptUnbarriered() != this);
|
|
}
|
|
|
|
static const uint32_t GSN_CACHE_THRESHOLD = 100;
|
|
|
|
void
|
|
GSNCache::purge()
|
|
{
|
|
code = nullptr;
|
|
if (map.initialized())
|
|
map.finish();
|
|
}
|
|
|
|
jssrcnote*
|
|
js::GetSrcNote(GSNCache& cache, JSScript* script, jsbytecode* pc)
|
|
{
|
|
size_t target = pc - script->code();
|
|
if (target >= script->length())
|
|
return nullptr;
|
|
|
|
if (cache.code == script->code()) {
|
|
MOZ_ASSERT(cache.map.initialized());
|
|
GSNCache::Map::Ptr p = cache.map.lookup(pc);
|
|
return p ? p->value() : nullptr;
|
|
}
|
|
|
|
size_t offset = 0;
|
|
jssrcnote* result;
|
|
for (jssrcnote* sn = script->notes(); ; sn = SN_NEXT(sn)) {
|
|
if (SN_IS_TERMINATOR(sn)) {
|
|
result = nullptr;
|
|
break;
|
|
}
|
|
offset += SN_DELTA(sn);
|
|
if (offset == target && SN_IS_GETTABLE(sn)) {
|
|
result = sn;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (cache.code != script->code() && script->length() >= GSN_CACHE_THRESHOLD) {
|
|
unsigned nsrcnotes = 0;
|
|
for (jssrcnote* sn = script->notes(); !SN_IS_TERMINATOR(sn);
|
|
sn = SN_NEXT(sn))
|
|
{
|
|
if (SN_IS_GETTABLE(sn))
|
|
++nsrcnotes;
|
|
}
|
|
if (cache.code) {
|
|
MOZ_ASSERT(cache.map.initialized());
|
|
cache.map.finish();
|
|
cache.code = nullptr;
|
|
}
|
|
if (cache.map.init(nsrcnotes)) {
|
|
pc = script->code();
|
|
for (jssrcnote* sn = script->notes(); !SN_IS_TERMINATOR(sn);
|
|
sn = SN_NEXT(sn))
|
|
{
|
|
pc += SN_DELTA(sn);
|
|
if (SN_IS_GETTABLE(sn))
|
|
cache.map.putNewInfallible(pc, sn);
|
|
}
|
|
cache.code = script->code();
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
jssrcnote*
|
|
js::GetSrcNote(JSContext* cx, JSScript* script, jsbytecode* pc)
|
|
{
|
|
return GetSrcNote(cx->runtime()->gsnCache, script, pc);
|
|
}
|
|
|
|
unsigned
|
|
js::PCToLineNumber(unsigned startLine, jssrcnote* notes, jsbytecode* code, jsbytecode* pc,
|
|
unsigned* columnp)
|
|
{
|
|
unsigned lineno = startLine;
|
|
unsigned column = 0;
|
|
|
|
/*
|
|
* Walk through source notes accumulating their deltas, keeping track of
|
|
* line-number notes, until we pass the note for pc's offset within
|
|
* script->code.
|
|
*/
|
|
ptrdiff_t offset = 0;
|
|
ptrdiff_t target = pc - code;
|
|
for (jssrcnote* sn = notes; !SN_IS_TERMINATOR(sn); sn = SN_NEXT(sn)) {
|
|
offset += SN_DELTA(sn);
|
|
if (offset > target)
|
|
break;
|
|
|
|
SrcNoteType type = (SrcNoteType) SN_TYPE(sn);
|
|
if (type == SRC_SETLINE) {
|
|
lineno = unsigned(GetSrcNoteOffset(sn, 0));
|
|
column = 0;
|
|
} else if (type == SRC_NEWLINE) {
|
|
lineno++;
|
|
column = 0;
|
|
} else if (type == SRC_COLSPAN) {
|
|
ptrdiff_t colspan = SN_OFFSET_TO_COLSPAN(GetSrcNoteOffset(sn, 0));
|
|
MOZ_ASSERT(ptrdiff_t(column) + colspan >= 0);
|
|
column += colspan;
|
|
}
|
|
}
|
|
|
|
if (columnp)
|
|
*columnp = column;
|
|
|
|
return lineno;
|
|
}
|
|
|
|
unsigned
|
|
js::PCToLineNumber(JSScript* script, jsbytecode* pc, unsigned* columnp)
|
|
{
|
|
/* Cope with InterpreterFrame.pc value prior to entering Interpret. */
|
|
if (!pc)
|
|
return 0;
|
|
|
|
return PCToLineNumber(script->lineno(), script->notes(), script->code(), pc, columnp);
|
|
}
|
|
|
|
jsbytecode*
|
|
js::LineNumberToPC(JSScript* script, unsigned target)
|
|
{
|
|
ptrdiff_t offset = 0;
|
|
ptrdiff_t best = -1;
|
|
unsigned lineno = script->lineno();
|
|
unsigned bestdiff = SN_MAX_OFFSET;
|
|
for (jssrcnote* sn = script->notes(); !SN_IS_TERMINATOR(sn); sn = SN_NEXT(sn)) {
|
|
/*
|
|
* Exact-match only if offset is not in the prologue; otherwise use
|
|
* nearest greater-or-equal line number match.
|
|
*/
|
|
if (lineno == target && offset >= ptrdiff_t(script->mainOffset()))
|
|
goto out;
|
|
if (lineno >= target) {
|
|
unsigned diff = lineno - target;
|
|
if (diff < bestdiff) {
|
|
bestdiff = diff;
|
|
best = offset;
|
|
}
|
|
}
|
|
offset += SN_DELTA(sn);
|
|
SrcNoteType type = (SrcNoteType) SN_TYPE(sn);
|
|
if (type == SRC_SETLINE) {
|
|
lineno = unsigned(GetSrcNoteOffset(sn, 0));
|
|
} else if (type == SRC_NEWLINE) {
|
|
lineno++;
|
|
}
|
|
}
|
|
if (best >= 0)
|
|
offset = best;
|
|
out:
|
|
return script->offsetToPC(offset);
|
|
}
|
|
|
|
JS_FRIEND_API(unsigned)
|
|
js::GetScriptLineExtent(JSScript* script)
|
|
{
|
|
unsigned lineno = script->lineno();
|
|
unsigned maxLineNo = lineno;
|
|
for (jssrcnote* sn = script->notes(); !SN_IS_TERMINATOR(sn); sn = SN_NEXT(sn)) {
|
|
SrcNoteType type = (SrcNoteType) SN_TYPE(sn);
|
|
if (type == SRC_SETLINE)
|
|
lineno = unsigned(GetSrcNoteOffset(sn, 0));
|
|
else if (type == SRC_NEWLINE)
|
|
lineno++;
|
|
|
|
if (maxLineNo < lineno)
|
|
maxLineNo = lineno;
|
|
}
|
|
|
|
return 1 + maxLineNo - script->lineno();
|
|
}
|
|
|
|
void
|
|
js::DescribeScriptedCallerForCompilation(JSContext* cx, MutableHandleScript maybeScript,
|
|
const char** file, unsigned* linenop,
|
|
uint32_t* pcOffset, bool* mutedErrors,
|
|
LineOption opt)
|
|
{
|
|
if (opt == CALLED_FROM_JSOP_EVAL) {
|
|
jsbytecode* pc = nullptr;
|
|
maybeScript.set(cx->currentScript(&pc));
|
|
static_assert(JSOP_SPREADEVAL_LENGTH == JSOP_STRICTSPREADEVAL_LENGTH,
|
|
"next op after a spread must be at consistent offset");
|
|
static_assert(JSOP_EVAL_LENGTH == JSOP_STRICTEVAL_LENGTH,
|
|
"next op after a direct eval must be at consistent offset");
|
|
MOZ_ASSERT(JSOp(*pc) == JSOP_EVAL || JSOp(*pc) == JSOP_STRICTEVAL ||
|
|
JSOp(*pc) == JSOP_SPREADEVAL || JSOp(*pc) == JSOP_STRICTSPREADEVAL);
|
|
|
|
bool isSpread = JSOp(*pc) == JSOP_SPREADEVAL || JSOp(*pc) == JSOP_STRICTSPREADEVAL;
|
|
jsbytecode* nextpc = pc + (isSpread ? JSOP_SPREADEVAL_LENGTH : JSOP_EVAL_LENGTH);
|
|
MOZ_ASSERT(*nextpc == JSOP_LINENO);
|
|
|
|
*file = maybeScript->filename();
|
|
*linenop = GET_UINT32(nextpc);
|
|
*pcOffset = pc - maybeScript->code();
|
|
*mutedErrors = maybeScript->mutedErrors();
|
|
return;
|
|
}
|
|
|
|
NonBuiltinFrameIter iter(cx);
|
|
|
|
if (iter.done()) {
|
|
maybeScript.set(nullptr);
|
|
*file = nullptr;
|
|
*linenop = 0;
|
|
*pcOffset = 0;
|
|
*mutedErrors = false;
|
|
return;
|
|
}
|
|
|
|
*file = iter.filename();
|
|
*linenop = iter.computeLine();
|
|
*mutedErrors = iter.mutedErrors();
|
|
|
|
// These values are only used for introducer fields which are debugging
|
|
// information and can be safely left null for asm.js frames.
|
|
if (iter.hasScript()) {
|
|
maybeScript.set(iter.script());
|
|
*pcOffset = iter.pc() - maybeScript->code();
|
|
} else {
|
|
maybeScript.set(nullptr);
|
|
*pcOffset = 0;
|
|
}
|
|
}
|
|
|
|
template <class T>
|
|
static inline T*
|
|
Rebase(JSScript* dst, JSScript* src, T* srcp)
|
|
{
|
|
size_t off = reinterpret_cast<uint8_t*>(srcp) - src->data;
|
|
return reinterpret_cast<T*>(dst->data + off);
|
|
}
|
|
|
|
static JSObject*
|
|
CloneInnerInterpretedFunction(JSContext* cx, HandleObject enclosingScope, HandleFunction srcFun)
|
|
{
|
|
/* NB: Keep this in sync with XDRInterpretedFunction. */
|
|
RootedObject cloneProto(cx);
|
|
if (srcFun->isStarGenerator()) {
|
|
cloneProto = GlobalObject::getOrCreateStarGeneratorFunctionPrototype(cx, cx->global());
|
|
if (!cloneProto)
|
|
return nullptr;
|
|
}
|
|
|
|
gc::AllocKind allocKind = srcFun->getAllocKind();
|
|
uint16_t flags = srcFun->flags();
|
|
if (srcFun->isSelfHostedBuiltin()) {
|
|
// Functions in the self-hosting compartment are only extended in
|
|
// debug mode. For top-level functions, FUNCTION_EXTENDED gets used by
|
|
// the cloning algorithm. Do the same for inner functions here.
|
|
allocKind = gc::AllocKind::FUNCTION_EXTENDED;
|
|
flags |= JSFunction::Flags::EXTENDED;
|
|
}
|
|
RootedAtom atom(cx, srcFun->displayAtom());
|
|
RootedFunction clone(cx, NewFunctionWithProto(cx, nullptr, srcFun->nargs(),
|
|
JSFunction::Flags(flags), nullptr, atom,
|
|
cloneProto, allocKind, TenuredObject));
|
|
if (!clone)
|
|
return nullptr;
|
|
|
|
JSScript::AutoDelazify srcScript(cx, srcFun);
|
|
if (!srcScript)
|
|
return nullptr;
|
|
JSScript* cloneScript = CloneScriptIntoFunction(cx, enclosingScope, clone, srcScript);
|
|
if (!cloneScript)
|
|
return nullptr;
|
|
|
|
if (!JSFunction::setTypeForScriptedFunction(cx, clone))
|
|
return nullptr;
|
|
|
|
return clone;
|
|
}
|
|
|
|
bool
|
|
js::detail::CopyScript(JSContext* cx, HandleObject scriptStaticScope, HandleScript src,
|
|
HandleScript dst)
|
|
{
|
|
if (src->treatAsRunOnce() && !src->functionNonDelazifying()) {
|
|
// Toplevel run-once scripts may not be cloned.
|
|
JS_ReportError(cx, "No cloning toplevel run-once scripts");
|
|
return false;
|
|
}
|
|
|
|
/* NB: Keep this in sync with XDRScript. */
|
|
|
|
/* Some embeddings are not careful to use ExposeObjectToActiveJS as needed. */
|
|
MOZ_ASSERT(!src->sourceObject()->asTenured().isMarked(gc::GRAY));
|
|
|
|
uint32_t nconsts = src->hasConsts() ? src->consts()->length : 0;
|
|
uint32_t nobjects = src->hasObjects() ? src->objects()->length : 0;
|
|
uint32_t nregexps = src->hasRegexps() ? src->regexps()->length : 0;
|
|
uint32_t ntrynotes = src->hasTrynotes() ? src->trynotes()->length : 0;
|
|
uint32_t nblockscopes = src->hasBlockScopes() ? src->blockScopes()->length : 0;
|
|
uint32_t nyieldoffsets = src->hasYieldOffsets() ? src->yieldOffsets().length() : 0;
|
|
|
|
/* Script data */
|
|
|
|
size_t size = src->dataSize();
|
|
ScopedJSFreePtr<uint8_t> data(AllocScriptData(cx->zone(), size));
|
|
if (size && !data) {
|
|
ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
|
|
/* Bindings */
|
|
|
|
Rooted<Bindings> bindings(cx);
|
|
if (!Bindings::clone(cx, &bindings, data, src))
|
|
return false;
|
|
|
|
/* Objects */
|
|
|
|
AutoObjectVector objects(cx);
|
|
if (nobjects != 0) {
|
|
HeapPtrObject* vector = src->objects()->vector;
|
|
for (unsigned i = 0; i < nobjects; i++) {
|
|
RootedObject obj(cx, vector[i]);
|
|
RootedObject clone(cx);
|
|
if (obj->is<NestedStaticScope>()) {
|
|
Rooted<NestedStaticScope*> innerBlock(cx, &obj->as<NestedStaticScope>());
|
|
|
|
RootedObject enclosingScope(cx);
|
|
if (NestedStaticScope* enclosingBlock = innerBlock->enclosingNestedScope()) {
|
|
if (IsStaticGlobalLexicalScope(enclosingBlock)) {
|
|
MOZ_ASSERT(IsStaticGlobalLexicalScope(scriptStaticScope) ||
|
|
scriptStaticScope->is<StaticNonSyntacticScope>());
|
|
enclosingScope = scriptStaticScope;
|
|
} else {
|
|
enclosingScope = objects[FindScopeObjectIndex(src, *enclosingBlock)];
|
|
}
|
|
} else {
|
|
enclosingScope = scriptStaticScope;
|
|
}
|
|
|
|
clone = CloneNestedScopeObject(cx, enclosingScope, innerBlock);
|
|
} else if (obj->is<JSFunction>()) {
|
|
RootedFunction innerFun(cx, &obj->as<JSFunction>());
|
|
if (innerFun->isNative()) {
|
|
if (cx->compartment() != innerFun->compartment()) {
|
|
MOZ_ASSERT(innerFun->isAsmJSNative());
|
|
JS_ReportError(cx, "AsmJS modules do not yet support cloning.");
|
|
return false;
|
|
}
|
|
clone = innerFun;
|
|
} else {
|
|
if (innerFun->isInterpretedLazy()) {
|
|
AutoCompartment ac(cx, innerFun);
|
|
if (!innerFun->getOrCreateScript(cx))
|
|
return false;
|
|
}
|
|
RootedObject staticScope(cx, innerFun->nonLazyScript()->enclosingStaticScope());
|
|
StaticScopeIter<CanGC> ssi(cx, staticScope);
|
|
RootedObject enclosingScope(cx);
|
|
if (ssi.done() || ssi.type() == StaticScopeIter<CanGC>::NonSyntactic) {
|
|
enclosingScope = scriptStaticScope;
|
|
} else if (ssi.type() == StaticScopeIter<CanGC>::Function) {
|
|
MOZ_ASSERT(scriptStaticScope->is<JSFunction>());
|
|
enclosingScope = scriptStaticScope;
|
|
} else if (ssi.type() == StaticScopeIter<CanGC>::Block) {
|
|
if (ssi.block().isGlobal()) {
|
|
MOZ_ASSERT(IsStaticGlobalLexicalScope(scriptStaticScope) ||
|
|
scriptStaticScope->is<StaticNonSyntacticScope>());
|
|
enclosingScope = scriptStaticScope;
|
|
} else {
|
|
enclosingScope = objects[FindScopeObjectIndex(src, ssi.block())];
|
|
}
|
|
} else {
|
|
enclosingScope = objects[FindScopeObjectIndex(src, ssi.staticWith())];
|
|
}
|
|
|
|
clone = CloneInnerInterpretedFunction(cx, enclosingScope, innerFun);
|
|
}
|
|
} else {
|
|
clone = DeepCloneObjectLiteral(cx, obj, TenuredObject);
|
|
}
|
|
if (!clone || !objects.append(clone))
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/* RegExps */
|
|
|
|
AutoObjectVector regexps(cx);
|
|
for (unsigned i = 0; i < nregexps; i++) {
|
|
HeapPtrObject* vector = src->regexps()->vector;
|
|
for (unsigned i = 0; i < nregexps; i++) {
|
|
JSObject* clone = CloneScriptRegExpObject(cx, vector[i]->as<RegExpObject>());
|
|
if (!clone || !regexps.append(clone))
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/* Now that all fallible allocation is complete, do the copying. */
|
|
|
|
dst->bindings = bindings;
|
|
|
|
/* This assignment must occur before all the Rebase calls. */
|
|
dst->data = data.forget();
|
|
dst->dataSize_ = size;
|
|
memcpy(dst->data, src->data, size);
|
|
|
|
/* Script filenames, bytecodes and atoms are runtime-wide. */
|
|
dst->setCode(src->code());
|
|
dst->atoms = src->atoms;
|
|
|
|
dst->setLength(src->length());
|
|
dst->lineno_ = src->lineno();
|
|
dst->mainOffset_ = src->mainOffset();
|
|
dst->natoms_ = src->natoms();
|
|
dst->funLength_ = src->funLength();
|
|
dst->nTypeSets_ = src->nTypeSets();
|
|
dst->nslots_ = src->nslots();
|
|
if (src->argumentsHasVarBinding()) {
|
|
dst->setArgumentsHasVarBinding();
|
|
if (src->analyzedArgsUsage())
|
|
dst->setNeedsArgsObj(src->needsArgsObj());
|
|
}
|
|
dst->hasMappedArgsObj_ = src->hasMappedArgsObj();
|
|
dst->functionHasThisBinding_ = src->functionHasThisBinding();
|
|
dst->cloneHasArray(src);
|
|
dst->strict_ = src->strict();
|
|
dst->explicitUseStrict_ = src->explicitUseStrict();
|
|
dst->bindingsAccessedDynamically_ = src->bindingsAccessedDynamically();
|
|
dst->funHasExtensibleScope_ = src->funHasExtensibleScope();
|
|
dst->funNeedsDeclEnvObject_ = src->funNeedsDeclEnvObject();
|
|
dst->funHasAnyAliasedFormal_ = src->funHasAnyAliasedFormal();
|
|
dst->hasSingletons_ = src->hasSingletons();
|
|
dst->treatAsRunOnce_ = src->treatAsRunOnce();
|
|
dst->hasInnerFunctions_ = src->hasInnerFunctions();
|
|
dst->isGeneratorExp_ = src->isGeneratorExp();
|
|
dst->setGeneratorKind(src->generatorKind());
|
|
dst->isDerivedClassConstructor_ = src->isDerivedClassConstructor();
|
|
dst->needsHomeObject_ = src->needsHomeObject();
|
|
dst->isDefaultClassConstructor_ = src->isDefaultClassConstructor();
|
|
|
|
if (nconsts != 0) {
|
|
HeapValue* vector = Rebase<HeapValue>(dst, src, src->consts()->vector);
|
|
dst->consts()->vector = vector;
|
|
for (unsigned i = 0; i < nconsts; ++i)
|
|
MOZ_ASSERT_IF(vector[i].isMarkable(), vector[i].toString()->isAtom());
|
|
}
|
|
if (nobjects != 0) {
|
|
HeapPtrObject* vector = Rebase<HeapPtrObject>(dst, src, src->objects()->vector);
|
|
dst->objects()->vector = vector;
|
|
for (unsigned i = 0; i < nobjects; ++i)
|
|
vector[i].init(&objects[i]->as<NativeObject>());
|
|
}
|
|
if (nregexps != 0) {
|
|
HeapPtrObject* vector = Rebase<HeapPtrObject>(dst, src, src->regexps()->vector);
|
|
dst->regexps()->vector = vector;
|
|
for (unsigned i = 0; i < nregexps; ++i)
|
|
vector[i].init(®exps[i]->as<NativeObject>());
|
|
}
|
|
if (ntrynotes != 0)
|
|
dst->trynotes()->vector = Rebase<JSTryNote>(dst, src, src->trynotes()->vector);
|
|
if (nblockscopes != 0)
|
|
dst->blockScopes()->vector = Rebase<BlockScopeNote>(dst, src, src->blockScopes()->vector);
|
|
if (nyieldoffsets != 0)
|
|
dst->yieldOffsets().vector_ = Rebase<uint32_t>(dst, src, src->yieldOffsets().vector_);
|
|
|
|
/*
|
|
* Function delazification assumes that their script does not have a
|
|
* non-syntactic global scope. We ensure that as follows:
|
|
*
|
|
* 1) Initial parsing only creates lazy functions if
|
|
* !hasNonSyntacticScope.
|
|
* 2) Cloning a lazy function into a non-global scope will always require
|
|
* that its script be cloned. See comments in
|
|
* CloneFunctionObjectUseSameScript.
|
|
* 3) Cloning a script never sets a lazyScript on the clone, so the function
|
|
* cannot be relazified.
|
|
*
|
|
* If you decide that lazy functions should be supported with a
|
|
* non-syntactic global scope, make sure delazification can deal.
|
|
*/
|
|
MOZ_ASSERT_IF(dst->hasNonSyntacticScope(), !dst->maybeLazyScript());
|
|
MOZ_ASSERT_IF(dst->hasNonSyntacticScope(), !dst->isRelazifiable());
|
|
return true;
|
|
}
|
|
|
|
static JSScript*
|
|
CreateEmptyScriptForClone(JSContext* cx, HandleObject enclosingScope, HandleScript src)
|
|
{
|
|
/*
|
|
* Wrap the script source object as needed. Self-hosted scripts may be
|
|
* in another runtime, so lazily create a new script source object to
|
|
* use for them.
|
|
*/
|
|
RootedObject sourceObject(cx);
|
|
if (cx->runtime()->isSelfHostingCompartment(src->compartment())) {
|
|
if (!cx->compartment()->selfHostingScriptSource) {
|
|
CompileOptions options(cx);
|
|
FillSelfHostingCompileOptions(options);
|
|
|
|
ScriptSourceObject* obj = frontend::CreateScriptSourceObject(cx, options);
|
|
if (!obj)
|
|
return nullptr;
|
|
cx->compartment()->selfHostingScriptSource.set(obj);
|
|
}
|
|
sourceObject = cx->compartment()->selfHostingScriptSource;
|
|
} else {
|
|
sourceObject = src->sourceObject();
|
|
if (!cx->compartment()->wrap(cx, &sourceObject))
|
|
return nullptr;
|
|
}
|
|
|
|
CompileOptions options(cx);
|
|
options.setMutedErrors(src->mutedErrors())
|
|
.setSelfHostingMode(src->selfHosted())
|
|
.setNoScriptRval(src->noScriptRval())
|
|
.setVersion(src->getVersion());
|
|
|
|
return JSScript::Create(cx, enclosingScope, src->savedCallerFun(),
|
|
options, sourceObject, src->sourceStart(), src->sourceEnd());
|
|
}
|
|
|
|
JSScript*
|
|
js::CloneGlobalScript(JSContext* cx, Handle<StaticScope*> enclosingScope, HandleScript src)
|
|
{
|
|
MOZ_ASSERT(IsStaticGlobalLexicalScope(enclosingScope) ||
|
|
enclosingScope->is<StaticNonSyntacticScope>());
|
|
|
|
RootedScript dst(cx, CreateEmptyScriptForClone(cx, enclosingScope, src));
|
|
if (!dst)
|
|
return nullptr;
|
|
|
|
if (!detail::CopyScript(cx, enclosingScope, src, dst))
|
|
return nullptr;
|
|
|
|
return dst;
|
|
}
|
|
|
|
JSScript*
|
|
js::CloneScriptIntoFunction(JSContext* cx, HandleObject enclosingScope, HandleFunction fun,
|
|
HandleScript src)
|
|
{
|
|
MOZ_ASSERT(fun->isInterpreted());
|
|
|
|
// Allocate the destination script up front and set it as the script of
|
|
// |fun|, which is to be its container.
|
|
//
|
|
// This is so that when cloning nested functions, they can walk the static
|
|
// scope chain via fun and correctly compute the presence of a
|
|
// non-syntactic global.
|
|
RootedScript dst(cx, CreateEmptyScriptForClone(cx, enclosingScope, src));
|
|
if (!dst)
|
|
return nullptr;
|
|
|
|
// Save flags in case we need to undo the early mutations.
|
|
const int preservedFlags = fun->flags();
|
|
|
|
dst->setFunction(fun);
|
|
Rooted<LazyScript*> lazy(cx);
|
|
if (fun->isInterpretedLazy()) {
|
|
lazy = fun->lazyScriptOrNull();
|
|
fun->setUnlazifiedScript(dst);
|
|
} else {
|
|
fun->initScript(dst);
|
|
}
|
|
|
|
if (!detail::CopyScript(cx, fun, src, dst)) {
|
|
if (lazy)
|
|
fun->initLazyScript(lazy);
|
|
else
|
|
fun->setScript(nullptr);
|
|
fun->setFlags(preservedFlags);
|
|
return nullptr;
|
|
}
|
|
|
|
return dst;
|
|
}
|
|
|
|
DebugScript*
|
|
JSScript::debugScript()
|
|
{
|
|
MOZ_ASSERT(hasDebugScript_);
|
|
DebugScriptMap* map = compartment()->debugScriptMap;
|
|
MOZ_ASSERT(map);
|
|
DebugScriptMap::Ptr p = map->lookup(this);
|
|
MOZ_ASSERT(p);
|
|
return p->value();
|
|
}
|
|
|
|
DebugScript*
|
|
JSScript::releaseDebugScript()
|
|
{
|
|
MOZ_ASSERT(hasDebugScript_);
|
|
DebugScriptMap* map = compartment()->debugScriptMap;
|
|
MOZ_ASSERT(map);
|
|
DebugScriptMap::Ptr p = map->lookup(this);
|
|
MOZ_ASSERT(p);
|
|
DebugScript* debug = p->value();
|
|
map->remove(p);
|
|
hasDebugScript_ = false;
|
|
return debug;
|
|
}
|
|
|
|
void
|
|
JSScript::destroyDebugScript(FreeOp* fop)
|
|
{
|
|
if (hasDebugScript_) {
|
|
#ifdef DEBUG
|
|
for (jsbytecode* pc = code(); pc < codeEnd(); pc++) {
|
|
if (BreakpointSite* site = getBreakpointSite(pc)) {
|
|
/* Breakpoints are swept before finalization. */
|
|
MOZ_ASSERT(site->firstBreakpoint() == nullptr);
|
|
MOZ_ASSERT(getBreakpointSite(pc) == nullptr);
|
|
}
|
|
}
|
|
#endif
|
|
fop->free_(releaseDebugScript());
|
|
}
|
|
}
|
|
|
|
bool
|
|
JSScript::ensureHasDebugScript(JSContext* cx)
|
|
{
|
|
if (hasDebugScript_)
|
|
return true;
|
|
|
|
size_t nbytes = offsetof(DebugScript, breakpoints) + length() * sizeof(BreakpointSite*);
|
|
DebugScript* debug = (DebugScript*) zone()->pod_calloc<uint8_t>(nbytes);
|
|
if (!debug)
|
|
return false;
|
|
|
|
/* Create compartment's debugScriptMap if necessary. */
|
|
DebugScriptMap* map = compartment()->debugScriptMap;
|
|
if (!map) {
|
|
map = cx->new_<DebugScriptMap>();
|
|
if (!map || !map->init()) {
|
|
js_free(debug);
|
|
js_delete(map);
|
|
return false;
|
|
}
|
|
compartment()->debugScriptMap = map;
|
|
}
|
|
|
|
if (!map->putNew(this, debug)) {
|
|
js_free(debug);
|
|
return false;
|
|
}
|
|
hasDebugScript_ = true; // safe to set this; we can't fail after this point
|
|
|
|
/*
|
|
* Ensure that any Interpret() instances running on this script have
|
|
* interrupts enabled. The interrupts must stay enabled until the
|
|
* debug state is destroyed.
|
|
*/
|
|
for (ActivationIterator iter(cx->runtime()); !iter.done(); ++iter) {
|
|
if (iter->isInterpreter())
|
|
iter->asInterpreter()->enableInterruptsIfRunning(this);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void
|
|
JSScript::setNewStepMode(FreeOp* fop, uint32_t newValue)
|
|
{
|
|
DebugScript* debug = debugScript();
|
|
uint32_t prior = debug->stepMode;
|
|
debug->stepMode = newValue;
|
|
|
|
if (!prior != !newValue) {
|
|
if (hasBaselineScript())
|
|
baseline->toggleDebugTraps(this, nullptr);
|
|
|
|
if (!stepModeEnabled() && !debug->numSites)
|
|
fop->free_(releaseDebugScript());
|
|
}
|
|
}
|
|
|
|
bool
|
|
JSScript::incrementStepModeCount(JSContext* cx)
|
|
{
|
|
assertSameCompartment(cx, this);
|
|
MOZ_ASSERT(cx->compartment()->isDebuggee());
|
|
|
|
if (!ensureHasDebugScript(cx))
|
|
return false;
|
|
|
|
DebugScript* debug = debugScript();
|
|
uint32_t count = debug->stepMode;
|
|
setNewStepMode(cx->runtime()->defaultFreeOp(), count + 1);
|
|
return true;
|
|
}
|
|
|
|
void
|
|
JSScript::decrementStepModeCount(FreeOp* fop)
|
|
{
|
|
DebugScript* debug = debugScript();
|
|
uint32_t count = debug->stepMode;
|
|
MOZ_ASSERT(count > 0);
|
|
setNewStepMode(fop, count - 1);
|
|
}
|
|
|
|
BreakpointSite*
|
|
JSScript::getOrCreateBreakpointSite(JSContext* cx, jsbytecode* pc)
|
|
{
|
|
if (!ensureHasDebugScript(cx))
|
|
return nullptr;
|
|
|
|
DebugScript* debug = debugScript();
|
|
BreakpointSite*& site = debug->breakpoints[pcToOffset(pc)];
|
|
|
|
if (!site) {
|
|
site = cx->runtime()->new_<BreakpointSite>(this, pc);
|
|
if (!site) {
|
|
ReportOutOfMemory(cx);
|
|
return nullptr;
|
|
}
|
|
debug->numSites++;
|
|
}
|
|
|
|
return site;
|
|
}
|
|
|
|
void
|
|
JSScript::destroyBreakpointSite(FreeOp* fop, jsbytecode* pc)
|
|
{
|
|
DebugScript* debug = debugScript();
|
|
BreakpointSite*& site = debug->breakpoints[pcToOffset(pc)];
|
|
MOZ_ASSERT(site);
|
|
|
|
fop->delete_(site);
|
|
site = nullptr;
|
|
|
|
if (--debug->numSites == 0 && !stepModeEnabled())
|
|
fop->free_(releaseDebugScript());
|
|
}
|
|
|
|
void
|
|
JSScript::clearBreakpointsIn(FreeOp* fop, js::Debugger* dbg, JSObject* handler)
|
|
{
|
|
if (!hasAnyBreakpointsOrStepMode())
|
|
return;
|
|
|
|
for (jsbytecode* pc = code(); pc < codeEnd(); pc++) {
|
|
BreakpointSite* site = getBreakpointSite(pc);
|
|
if (site) {
|
|
Breakpoint* nextbp;
|
|
for (Breakpoint* bp = site->firstBreakpoint(); bp; bp = nextbp) {
|
|
nextbp = bp->nextInSite();
|
|
if ((!dbg || bp->debugger == dbg) && (!handler || bp->getHandler() == handler))
|
|
bp->destroy(fop);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
bool
|
|
JSScript::hasBreakpointsAt(jsbytecode* pc)
|
|
{
|
|
BreakpointSite* site = getBreakpointSite(pc);
|
|
if (!site)
|
|
return false;
|
|
|
|
return site->enabledCount > 0;
|
|
}
|
|
|
|
void
|
|
JSScript::traceChildren(JSTracer* trc)
|
|
{
|
|
// NOTE: this JSScript may be partially initialized at this point. E.g. we
|
|
// may have created it and partially initialized it with
|
|
// JSScript::Create(), but not yet finished initializing it with
|
|
// fullyInitFromEmitter() or fullyInitTrivial().
|
|
|
|
MOZ_ASSERT_IF(trc->isMarkingTracer() &&
|
|
static_cast<GCMarker*>(trc)->shouldCheckCompartments(),
|
|
zone()->isCollecting());
|
|
|
|
if (atoms) {
|
|
for (uint32_t i = 0; i < natoms(); ++i) {
|
|
if (atoms[i])
|
|
TraceEdge(trc, &atoms[i], "atom");
|
|
}
|
|
}
|
|
|
|
if (hasObjects()) {
|
|
ObjectArray* objarray = objects();
|
|
TraceRange(trc, objarray->length, objarray->vector, "objects");
|
|
}
|
|
|
|
if (hasRegexps()) {
|
|
ObjectArray* objarray = regexps();
|
|
TraceRange(trc, objarray->length, objarray->vector, "regexps");
|
|
}
|
|
|
|
if (hasConsts()) {
|
|
ConstArray* constarray = consts();
|
|
TraceRange(trc, constarray->length, constarray->vector, "consts");
|
|
}
|
|
|
|
if (sourceObject()) {
|
|
MOZ_ASSERT(MaybeForwarded(sourceObject())->compartment() == compartment());
|
|
TraceEdge(trc, &sourceObject_, "sourceObject");
|
|
}
|
|
|
|
if (functionNonDelazifying())
|
|
TraceEdge(trc, &function_, "function");
|
|
|
|
if (module_)
|
|
TraceEdge(trc, &module_, "module");
|
|
|
|
if (enclosingStaticScope_)
|
|
TraceEdge(trc, &enclosingStaticScope_, "enclosingStaticScope");
|
|
|
|
if (maybeLazyScript())
|
|
TraceManuallyBarrieredEdge(trc, &lazyScript, "lazyScript");
|
|
|
|
if (trc->isMarkingTracer()) {
|
|
compartment()->mark();
|
|
|
|
if (code())
|
|
MarkScriptData(trc->runtime(), code());
|
|
}
|
|
|
|
bindings.trace(trc);
|
|
|
|
jit::TraceJitScripts(trc, this);
|
|
}
|
|
|
|
void
|
|
LazyScript::finalize(FreeOp* fop)
|
|
{
|
|
fop->free_(table_);
|
|
}
|
|
|
|
size_t
|
|
JSScript::calculateLiveFixed(jsbytecode* pc)
|
|
{
|
|
size_t nlivefixed = nbodyfixed();
|
|
|
|
if (nfixed() != nlivefixed) {
|
|
NestedStaticScope* staticScope = getStaticBlockScope(pc);
|
|
if (staticScope)
|
|
staticScope = MaybeForwarded(staticScope);
|
|
while (staticScope && !staticScope->is<StaticBlockScope>()) {
|
|
staticScope = staticScope->enclosingNestedScope();
|
|
if (staticScope)
|
|
staticScope = MaybeForwarded(staticScope);
|
|
}
|
|
|
|
if (staticScope && !IsStaticGlobalLexicalScope(staticScope)) {
|
|
StaticBlockScope& blockScope = staticScope->as<StaticBlockScope>();
|
|
nlivefixed = blockScope.localOffset() + blockScope.numVariables();
|
|
}
|
|
}
|
|
|
|
MOZ_ASSERT(nlivefixed <= nfixed());
|
|
MOZ_ASSERT(nlivefixed >= nbodyfixed());
|
|
|
|
return nlivefixed;
|
|
}
|
|
|
|
NestedStaticScope*
|
|
JSScript::getStaticBlockScope(jsbytecode* pc)
|
|
{
|
|
MOZ_ASSERT(containsPC(pc));
|
|
|
|
if (!hasBlockScopes())
|
|
return nullptr;
|
|
|
|
size_t offset = pc - code();
|
|
|
|
BlockScopeArray* scopes = blockScopes();
|
|
NestedStaticScope* blockChain = nullptr;
|
|
|
|
// Find the innermost block chain using a binary search.
|
|
size_t bottom = 0;
|
|
size_t top = scopes->length;
|
|
|
|
while (bottom < top) {
|
|
size_t mid = bottom + (top - bottom) / 2;
|
|
const BlockScopeNote* note = &scopes->vector[mid];
|
|
if (note->start <= offset) {
|
|
// Block scopes are ordered in the list by their starting offset, and since
|
|
// blocks form a tree ones earlier in the list may cover the pc even if
|
|
// later blocks end before the pc. This only happens when the earlier block
|
|
// is a parent of the later block, so we need to check parents of |mid| in
|
|
// the searched range for coverage.
|
|
size_t check = mid;
|
|
while (check >= bottom) {
|
|
const BlockScopeNote* checkNote = &scopes->vector[check];
|
|
MOZ_ASSERT(checkNote->start <= offset);
|
|
if (offset < checkNote->start + checkNote->length) {
|
|
// We found a matching block chain but there may be inner ones
|
|
// at a higher block chain index than mid. Continue the binary search.
|
|
if (checkNote->index == BlockScopeNote::NoBlockScopeIndex)
|
|
blockChain = nullptr;
|
|
else
|
|
blockChain = &getObject(checkNote->index)->as<NestedStaticScope>();
|
|
break;
|
|
}
|
|
if (checkNote->parent == UINT32_MAX)
|
|
break;
|
|
check = checkNote->parent;
|
|
}
|
|
bottom = mid + 1;
|
|
} else {
|
|
top = mid;
|
|
}
|
|
}
|
|
|
|
return blockChain;
|
|
}
|
|
|
|
JSObject*
|
|
JSScript::innermostStaticScopeInScript(jsbytecode* pc)
|
|
{
|
|
if (JSObject* scope = getStaticBlockScope(pc))
|
|
return scope;
|
|
if (module())
|
|
return module();
|
|
return functionNonDelazifying();
|
|
}
|
|
|
|
JSObject*
|
|
JSScript::innermostStaticScope(jsbytecode* pc)
|
|
{
|
|
if (JSObject* scope = innermostStaticScopeInScript(pc))
|
|
return scope;
|
|
return enclosingStaticScope();
|
|
}
|
|
|
|
void
|
|
JSScript::setArgumentsHasVarBinding()
|
|
{
|
|
argsHasVarBinding_ = true;
|
|
needsArgsAnalysis_ = true;
|
|
}
|
|
|
|
void
|
|
JSScript::setNeedsArgsObj(bool needsArgsObj)
|
|
{
|
|
MOZ_ASSERT_IF(needsArgsObj, argumentsHasVarBinding());
|
|
needsArgsAnalysis_ = false;
|
|
needsArgsObj_ = needsArgsObj;
|
|
}
|
|
|
|
void
|
|
js::SetFrameArgumentsObject(JSContext* cx, AbstractFramePtr frame,
|
|
HandleScript script, JSObject* argsobj)
|
|
{
|
|
/*
|
|
* Replace any optimized arguments in the frame with an explicit arguments
|
|
* object. Note that 'arguments' may have already been overwritten.
|
|
*/
|
|
|
|
BindingIter bi = Bindings::argumentsBinding(cx, script);
|
|
|
|
if (script->bindingIsAliased(bi)) {
|
|
/*
|
|
* Scan the script to find the slot in the call object that 'arguments'
|
|
* is assigned to.
|
|
*/
|
|
jsbytecode* pc = script->code();
|
|
while (*pc != JSOP_ARGUMENTS)
|
|
pc += GetBytecodeLength(pc);
|
|
pc += JSOP_ARGUMENTS_LENGTH;
|
|
MOZ_ASSERT(*pc == JSOP_SETALIASEDVAR);
|
|
|
|
// Note that here and below, it is insufficient to only check for
|
|
// JS_OPTIMIZED_ARGUMENTS, as Ion could have optimized out the
|
|
// arguments slot.
|
|
if (IsOptimizedPlaceholderMagicValue(frame.callObj().as<ScopeObject>().aliasedVar(ScopeCoordinate(pc))))
|
|
frame.callObj().as<ScopeObject>().setAliasedVar(cx, ScopeCoordinate(pc), cx->names().arguments, ObjectValue(*argsobj));
|
|
} else {
|
|
if (IsOptimizedPlaceholderMagicValue(frame.unaliasedLocal(bi.frameIndex())))
|
|
frame.unaliasedLocal(bi.frameIndex()) = ObjectValue(*argsobj);
|
|
}
|
|
}
|
|
|
|
/* static */ bool
|
|
JSScript::argumentsOptimizationFailed(JSContext* cx, HandleScript script)
|
|
{
|
|
MOZ_ASSERT(script->functionNonDelazifying());
|
|
MOZ_ASSERT(script->analyzedArgsUsage());
|
|
MOZ_ASSERT(script->argumentsHasVarBinding());
|
|
|
|
/*
|
|
* It is possible that the arguments optimization has already failed,
|
|
* everything has been fixed up, but there was an outstanding magic value
|
|
* on the stack that has just now flowed into an apply. In this case, there
|
|
* is nothing to do; GuardFunApplySpeculation will patch in the real
|
|
* argsobj.
|
|
*/
|
|
if (script->needsArgsObj())
|
|
return true;
|
|
|
|
MOZ_ASSERT(!script->isGenerator());
|
|
|
|
script->needsArgsObj_ = true;
|
|
|
|
/*
|
|
* Since we can't invalidate baseline scripts, set a flag that's checked from
|
|
* JIT code to indicate the arguments optimization failed and JSOP_ARGUMENTS
|
|
* should create an arguments object next time.
|
|
*/
|
|
if (script->hasBaselineScript())
|
|
script->baselineScript()->setNeedsArgsObj();
|
|
|
|
/*
|
|
* By design, the arguments optimization is only made when there are no
|
|
* outstanding cases of MagicValue(JS_OPTIMIZED_ARGUMENTS) at any points
|
|
* where the optimization could fail, other than an active invocation of
|
|
* 'f.apply(x, arguments)'. Thus, there are no outstanding values of
|
|
* MagicValue(JS_OPTIMIZED_ARGUMENTS) on the stack. However, there are
|
|
* three things that need fixup:
|
|
* - there may be any number of activations of this script that don't have
|
|
* an argsObj that now need one.
|
|
* - jit code compiled (and possible active on the stack) with the static
|
|
* assumption of !script->needsArgsObj();
|
|
* - type inference data for the script assuming script->needsArgsObj
|
|
*/
|
|
for (AllFramesIter i(cx); !i.done(); ++i) {
|
|
/*
|
|
* We cannot reliably create an arguments object for Ion activations of
|
|
* this script. To maintain the invariant that "script->needsArgsObj
|
|
* implies fp->hasArgsObj", the Ion bail mechanism will create an
|
|
* arguments object right after restoring the BaselineFrame and before
|
|
* entering Baseline code (in jit::FinishBailoutToBaseline).
|
|
*/
|
|
if (i.isIon())
|
|
continue;
|
|
AbstractFramePtr frame = i.abstractFramePtr();
|
|
if (frame.isFunctionFrame() && frame.script() == script) {
|
|
/* We crash on OOM since cleaning up here would be complicated. */
|
|
AutoEnterOOMUnsafeRegion oomUnsafe;
|
|
ArgumentsObject* argsobj = ArgumentsObject::createExpected(cx, frame);
|
|
if (!argsobj)
|
|
oomUnsafe.crash("JSScript::argumentsOptimizationFailed");
|
|
SetFrameArgumentsObject(cx, frame, script, argsobj);
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
JSScript::bindingIsAliased(const BindingIter& bi)
|
|
{
|
|
return bindings.bindingIsAliased(bi.i_);
|
|
}
|
|
|
|
bool
|
|
JSScript::formalIsAliased(unsigned argSlot)
|
|
{
|
|
MOZ_ASSERT(argSlot < bindings.numArgs());
|
|
return bindings.bindingIsAliased(argSlot);
|
|
}
|
|
|
|
bool
|
|
JSScript::localIsAliased(unsigned localSlot)
|
|
{
|
|
return bindings.bindingIsAliased(bindings.numArgs() + localSlot);
|
|
}
|
|
|
|
bool
|
|
JSScript::formalLivesInArgumentsObject(unsigned argSlot)
|
|
{
|
|
return argsObjAliasesFormals() && !formalIsAliased(argSlot);
|
|
}
|
|
|
|
LazyScript::LazyScript(JSFunction* fun, void* table, uint64_t packedFields, uint32_t begin, uint32_t end, uint32_t lineno, uint32_t column)
|
|
: script_(nullptr),
|
|
function_(fun),
|
|
enclosingScope_(nullptr),
|
|
sourceObject_(nullptr),
|
|
table_(table),
|
|
packedFields_(packedFields),
|
|
begin_(begin),
|
|
end_(end),
|
|
lineno_(lineno),
|
|
column_(column)
|
|
{
|
|
MOZ_ASSERT(begin <= end);
|
|
}
|
|
|
|
void
|
|
LazyScript::initScript(JSScript* script)
|
|
{
|
|
MOZ_ASSERT(script);
|
|
MOZ_ASSERT(!script_.unbarrieredGet());
|
|
script_.set(script);
|
|
}
|
|
|
|
void
|
|
LazyScript::resetScript()
|
|
{
|
|
MOZ_ASSERT(script_.unbarrieredGet());
|
|
script_.set(nullptr);
|
|
}
|
|
|
|
void
|
|
LazyScript::setParent(JSObject* enclosingScope, ScriptSourceObject* sourceObject)
|
|
{
|
|
MOZ_ASSERT(!sourceObject_ && !enclosingScope_);
|
|
MOZ_ASSERT_IF(enclosingScope, function_->compartment() == enclosingScope->compartment());
|
|
MOZ_ASSERT(function_->compartment() == sourceObject->compartment());
|
|
|
|
enclosingScope_ = enclosingScope;
|
|
sourceObject_ = sourceObject;
|
|
}
|
|
|
|
ScriptSourceObject*
|
|
LazyScript::sourceObject() const
|
|
{
|
|
return sourceObject_ ? &sourceObject_->as<ScriptSourceObject>() : nullptr;
|
|
}
|
|
|
|
ScriptSource*
|
|
LazyScript::maybeForwardedScriptSource() const
|
|
{
|
|
return UncheckedUnwrap(MaybeForwarded(sourceObject()))->as<ScriptSourceObject>().source();
|
|
}
|
|
|
|
/* static */ LazyScript*
|
|
LazyScript::CreateRaw(ExclusiveContext* cx, HandleFunction fun,
|
|
uint64_t packedFields, uint32_t begin, uint32_t end,
|
|
uint32_t lineno, uint32_t column)
|
|
{
|
|
union {
|
|
PackedView p;
|
|
uint64_t packed;
|
|
};
|
|
|
|
packed = packedFields;
|
|
|
|
// Reset runtime flags to obtain a fresh LazyScript.
|
|
p.hasBeenCloned = false;
|
|
p.treatAsRunOnce = false;
|
|
|
|
size_t bytes = (p.numFreeVariables * sizeof(FreeVariable))
|
|
+ (p.numInnerFunctions * sizeof(HeapPtrFunction));
|
|
|
|
ScopedJSFreePtr<uint8_t> table(bytes ? fun->zone()->pod_malloc<uint8_t>(bytes) : nullptr);
|
|
if (bytes && !table) {
|
|
ReportOutOfMemory(cx);
|
|
return nullptr;
|
|
}
|
|
|
|
LazyScript* res = Allocate<LazyScript>(cx);
|
|
if (!res)
|
|
return nullptr;
|
|
|
|
cx->compartment()->scheduleDelazificationForDebugger();
|
|
|
|
return new (res) LazyScript(fun, table.forget(), packed, begin, end, lineno, column);
|
|
}
|
|
|
|
/* static */ LazyScript*
|
|
LazyScript::CreateRaw(ExclusiveContext* cx, HandleFunction fun,
|
|
uint32_t numFreeVariables, uint32_t numInnerFunctions, JSVersion version,
|
|
uint32_t begin, uint32_t end, uint32_t lineno, uint32_t column)
|
|
{
|
|
union {
|
|
PackedView p;
|
|
uint64_t packedFields;
|
|
};
|
|
|
|
p.version = version;
|
|
p.numFreeVariables = numFreeVariables;
|
|
p.numInnerFunctions = numInnerFunctions;
|
|
p.generatorKindBits = GeneratorKindAsBits(NotGenerator);
|
|
p.strict = false;
|
|
p.bindingsAccessedDynamically = false;
|
|
p.hasDebuggerStatement = false;
|
|
p.hasDirectEval = false;
|
|
p.usesArgumentsApplyAndThis = false;
|
|
p.isDerivedClassConstructor = false;
|
|
p.needsHomeObject = false;
|
|
|
|
LazyScript* res = LazyScript::CreateRaw(cx, fun, packedFields, begin, end, lineno, column);
|
|
MOZ_ASSERT_IF(res, res->version() == version);
|
|
return res;
|
|
}
|
|
|
|
/* static */ LazyScript*
|
|
LazyScript::Create(ExclusiveContext* cx, HandleFunction fun,
|
|
HandleScript script, HandleObject enclosingScope,
|
|
HandleScript sourceObjectScript,
|
|
uint64_t packedFields, uint32_t begin, uint32_t end,
|
|
uint32_t lineno, uint32_t column)
|
|
{
|
|
// Dummy atom which is not a valid property name.
|
|
RootedAtom dummyAtom(cx, cx->names().comma);
|
|
|
|
// Dummy function which is not a valid function as this is the one which is
|
|
// holding this lazy script.
|
|
HandleFunction dummyFun = fun;
|
|
|
|
LazyScript* res = LazyScript::CreateRaw(cx, fun, packedFields, begin, end, lineno, column);
|
|
if (!res)
|
|
return nullptr;
|
|
|
|
// Fill with dummies, to be GC-safe after the initialization of the free
|
|
// variables and inner functions.
|
|
size_t i, num;
|
|
FreeVariable* variables = res->freeVariables();
|
|
for (i = 0, num = res->numFreeVariables(); i < num; i++)
|
|
variables[i] = FreeVariable(dummyAtom);
|
|
|
|
HeapPtrFunction* functions = res->innerFunctions();
|
|
for (i = 0, num = res->numInnerFunctions(); i < num; i++)
|
|
functions[i].init(dummyFun);
|
|
|
|
// Set the enclosing scope of the lazy function, this would later be
|
|
// used to define the environment when the function would be used.
|
|
MOZ_ASSERT(!res->sourceObject());
|
|
res->setParent(enclosingScope, &sourceObjectScript->scriptSourceUnwrap());
|
|
|
|
MOZ_ASSERT(!res->hasScript());
|
|
if (script)
|
|
res->initScript(script);
|
|
|
|
return res;
|
|
}
|
|
|
|
void
|
|
LazyScript::initRuntimeFields(uint64_t packedFields)
|
|
{
|
|
union {
|
|
PackedView p;
|
|
uint64_t packed;
|
|
};
|
|
|
|
packed = packedFields;
|
|
p_.hasBeenCloned = p.hasBeenCloned;
|
|
p_.treatAsRunOnce = p.treatAsRunOnce;
|
|
}
|
|
|
|
bool
|
|
LazyScript::hasUncompiledEnclosingScript() const
|
|
{
|
|
// It can happen that we created lazy scripts while compiling an enclosing
|
|
// script, but we errored out while compiling that script. When we iterate
|
|
// over lazy script in a compartment, we might see lazy scripts that never
|
|
// escaped to script and should be ignored.
|
|
//
|
|
// If the enclosing scope is a function with a null script or has a script
|
|
// without code, it was not successfully compiled.
|
|
|
|
if (!enclosingScope() || !enclosingScope()->is<JSFunction>())
|
|
return false;
|
|
|
|
JSFunction& fun = enclosingScope()->as<JSFunction>();
|
|
return !fun.hasScript() || fun.hasUncompiledScript() || !fun.nonLazyScript()->code();
|
|
}
|
|
|
|
void
|
|
JSScript::updateBaselineOrIonRaw(JSContext* maybecx)
|
|
{
|
|
if (hasBaselineScript() && baseline->hasPendingIonBuilder()) {
|
|
MOZ_ASSERT(maybecx);
|
|
MOZ_ASSERT(!isIonCompilingOffThread());
|
|
baselineOrIonRaw = maybecx->runtime()->jitRuntime()->lazyLinkStub()->raw();
|
|
baselineOrIonSkipArgCheck = maybecx->runtime()->jitRuntime()->lazyLinkStub()->raw();
|
|
} else if (hasIonScript()) {
|
|
baselineOrIonRaw = ion->method()->raw();
|
|
baselineOrIonSkipArgCheck = ion->method()->raw() + ion->getSkipArgCheckEntryOffset();
|
|
} else if (hasBaselineScript()) {
|
|
baselineOrIonRaw = baseline->method()->raw();
|
|
baselineOrIonSkipArgCheck = baseline->method()->raw();
|
|
} else {
|
|
baselineOrIonRaw = nullptr;
|
|
baselineOrIonSkipArgCheck = nullptr;
|
|
}
|
|
}
|
|
|
|
bool
|
|
JSScript::hasLoops()
|
|
{
|
|
if (!hasTrynotes())
|
|
return false;
|
|
JSTryNote* tn = trynotes()->vector;
|
|
JSTryNote* tnlimit = tn + trynotes()->length;
|
|
for (; tn < tnlimit; tn++) {
|
|
if (tn->kind == JSTRY_FOR_IN || tn->kind == JSTRY_LOOP)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
JSScript::mayReadFrameArgsDirectly()
|
|
{
|
|
return argumentsHasVarBinding() || (function_ && function_->hasRest());
|
|
}
|
|
|
|
static inline void
|
|
LazyScriptHash(uint32_t lineno, uint32_t column, uint32_t begin, uint32_t end,
|
|
HashNumber hashes[3])
|
|
{
|
|
HashNumber hash = lineno;
|
|
hash = RotateLeft(hash, 4) ^ column;
|
|
hash = RotateLeft(hash, 4) ^ begin;
|
|
hash = RotateLeft(hash, 4) ^ end;
|
|
|
|
hashes[0] = hash;
|
|
hashes[1] = RotateLeft(hashes[0], 4) ^ begin;
|
|
hashes[2] = RotateLeft(hashes[1], 4) ^ end;
|
|
}
|
|
|
|
void
|
|
LazyScriptHashPolicy::hash(const Lookup& lookup, HashNumber hashes[3])
|
|
{
|
|
LazyScript* lazy = lookup.lazy;
|
|
LazyScriptHash(lazy->lineno(), lazy->column(), lazy->begin(), lazy->end(), hashes);
|
|
}
|
|
|
|
void
|
|
LazyScriptHashPolicy::hash(JSScript* script, HashNumber hashes[3])
|
|
{
|
|
LazyScriptHash(script->lineno(), script->column(), script->sourceStart(), script->sourceEnd(), hashes);
|
|
}
|
|
|
|
bool
|
|
LazyScriptHashPolicy::match(JSScript* script, const Lookup& lookup)
|
|
{
|
|
JSContext* cx = lookup.cx;
|
|
LazyScript* lazy = lookup.lazy;
|
|
|
|
// To be a match, the script and lazy script need to have the same line
|
|
// and column and to be at the same position within their respective
|
|
// source blobs, and to have the same source contents and version.
|
|
//
|
|
// While the surrounding code in the source may differ, this is
|
|
// sufficient to ensure that compiling the lazy script will yield an
|
|
// identical result to compiling the original script.
|
|
//
|
|
// Note that the filenames and origin principals of the lazy script and
|
|
// original script can differ. If there is a match, these will be fixed
|
|
// up in the resulting clone by the caller.
|
|
|
|
if (script->lineno() != lazy->lineno() ||
|
|
script->column() != lazy->column() ||
|
|
script->getVersion() != lazy->version() ||
|
|
script->sourceStart() != lazy->begin() ||
|
|
script->sourceEnd() != lazy->end())
|
|
{
|
|
return false;
|
|
}
|
|
|
|
UncompressedSourceCache::AutoHoldEntry holder;
|
|
|
|
const char16_t* scriptChars = script->scriptSource()->chars(cx, holder);
|
|
if (!scriptChars)
|
|
return false;
|
|
|
|
const char16_t* lazyChars = lazy->scriptSource()->chars(cx, holder);
|
|
if (!lazyChars)
|
|
return false;
|
|
|
|
size_t begin = script->sourceStart();
|
|
size_t length = script->sourceEnd() - begin;
|
|
return !memcmp(scriptChars + begin, lazyChars + begin, length);
|
|
}
|
|
|
|
void
|
|
JSScript::AutoDelazify::holdScript(JS::HandleFunction fun)
|
|
{
|
|
if (fun) {
|
|
if (fun->compartment()->isSelfHosting) {
|
|
// The self-hosting compartment is shared across runtimes, so we
|
|
// can't use JSAutoCompartment: it could cause races. Functions in
|
|
// the self-hosting compartment will never be lazy, so we can safely
|
|
// assume we don't have to delazify.
|
|
script_ = fun->nonLazyScript();
|
|
} else {
|
|
JSAutoCompartment ac(cx_, fun);
|
|
script_ = fun->getOrCreateScript(cx_);
|
|
if (script_) {
|
|
oldDoNotRelazify_ = script_->doNotRelazify_;
|
|
script_->setDoNotRelazify(true);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
JSScript::AutoDelazify::dropScript()
|
|
{
|
|
// Don't touch script_ if it's in the self-hosting compartment, see the
|
|
// comment in holdScript.
|
|
if (script_ && !script_->compartment()->isSelfHosting)
|
|
script_->setDoNotRelazify(oldDoNotRelazify_);
|
|
script_ = nullptr;
|
|
}
|
|
|
|
JS::ubi::Node::Size
|
|
JS::ubi::Concrete<JSScript>::size(mozilla::MallocSizeOf mallocSizeOf) const
|
|
{
|
|
Size size = Arena::thingSize(get().asTenured().getAllocKind());
|
|
|
|
size += get().sizeOfData(mallocSizeOf);
|
|
size += get().sizeOfTypeScript(mallocSizeOf);
|
|
|
|
size_t baselineSize = 0;
|
|
size_t baselineStubsSize = 0;
|
|
jit::AddSizeOfBaselineData(&get(), mallocSizeOf, &baselineSize, &baselineStubsSize);
|
|
size += baselineSize;
|
|
size += baselineStubsSize;
|
|
|
|
size += jit::SizeOfIonData(&get(), mallocSizeOf);
|
|
|
|
MOZ_ASSERT(size > 0);
|
|
return size;
|
|
}
|
|
|
|
const char*
|
|
JS::ubi::Concrete<JSScript>::scriptFilename() const
|
|
{
|
|
return get().filename();
|
|
}
|
|
|
|
JS::ubi::Node::Size
|
|
JS::ubi::Concrete<js::LazyScript>::size(mozilla::MallocSizeOf mallocSizeOf) const
|
|
{
|
|
Size size = js::gc::Arena::thingSize(get().asTenured().getAllocKind());
|
|
size += get().sizeOfExcludingThis(mallocSizeOf);
|
|
return size;
|
|
}
|
|
|
|
const char*
|
|
JS::ubi::Concrete<js::LazyScript>::scriptFilename() const
|
|
{
|
|
auto sourceObject = get().sourceObject();
|
|
if (!sourceObject)
|
|
return nullptr;
|
|
|
|
auto source = sourceObject->source();
|
|
if (!source)
|
|
return nullptr;
|
|
|
|
return source->filename();
|
|
}
|