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Bug 807168 - Move rarely used code in GCMarker out of the header; r=jonco

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--HG--
extra : rebase_source : f8895a2a2a00f31a45900cdbc718a19aed6262d9
This commit is contained in:
Terrence Cole 2014-04-16 16:36:44 -07:00
parent ebba5aaeaf
commit e1e896bdf7
2 changed files with 148 additions and 119 deletions
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99
js/src/gc/Tracer.cpp
View File

@ -13,6 +13,7 @@
#include "jsgc.h"
#include "jsprf.h"
#include "jsscript.h"
#include "jsutil.h"
#include "NamespaceImports.h"
#include "gc/GCInternals.h"
@ -333,6 +334,100 @@ JSTracer::tracingLocation(void **thingp)
}
#endif
bool
MarkStack::init(JSGCMode gcMode)
{
setBaseCapacity(gcMode);
JS_ASSERT(!stack_);
uintptr_t *newStack = js_pod_malloc<uintptr_t>(baseCapacity_);
if (!newStack)
return false;
setStack(newStack, 0, baseCapacity_);
return true;
}
void
MarkStack::setBaseCapacity(JSGCMode mode)
{
switch (mode) {
case JSGC_MODE_GLOBAL:
case JSGC_MODE_COMPARTMENT:
baseCapacity_ = NON_INCREMENTAL_MARK_STACK_BASE_CAPACITY;
break;
case JSGC_MODE_INCREMENTAL:
baseCapacity_ = INCREMENTAL_MARK_STACK_BASE_CAPACITY;
break;
default:
MOZ_ASSUME_UNREACHABLE("bad gc mode");
}
if (baseCapacity_ > maxCapacity_)
baseCapacity_ = maxCapacity_;
}
void
MarkStack::setMaxCapacity(size_t maxCapacity)
{
JS_ASSERT(isEmpty());
maxCapacity_ = maxCapacity;
if (baseCapacity_ > maxCapacity_)
baseCapacity_ = maxCapacity_;
reset();
}
void
MarkStack::reset()
{
if (capacity() == baseCapacity_) {
// No size change; keep the current stack.
setStack(stack_, 0, baseCapacity_);
return;
}
uintptr_t *newStack = (uintptr_t *)js_realloc(stack_, sizeof(uintptr_t) * baseCapacity_);
if (!newStack) {
// If the realloc fails, just keep using the existing stack; it's
// not ideal but better than failing.
newStack = stack_;
baseCapacity_ = capacity();
}
setStack(newStack, 0, baseCapacity_);
}
bool
MarkStack::enlarge(unsigned count)
{
size_t newCapacity = Min(maxCapacity_, capacity() * 2);
if (newCapacity < capacity() + count)
return false;
size_t tosIndex = position();
uintptr_t *newStack = (uintptr_t *)js_realloc(stack_, sizeof(uintptr_t) * newCapacity);
if (!newStack)
return false;
setStack(newStack, tosIndex, newCapacity);
return true;
}
void
MarkStack::setGCMode(JSGCMode gcMode)
{
// The mark stack won't be resized until the next call to reset(), but
// that will happen at the end of the next GC.
setBaseCapacity(gcMode);
}
size_t
MarkStack::sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const
{
return mallocSizeOf(stack_);
}
/*
* DoNotTraceWeakMaps: the GC is recomputing the liveness of WeakMap entries,
* so we delay visting entries.
@ -341,10 +436,10 @@ GCMarker::GCMarker(JSRuntime *rt)
: JSTracer(rt, nullptr, DoNotTraceWeakMaps),
stack(size_t(-1)),
color(BLACK),
started(false),
unmarkedArenaStackTop(nullptr),
markLaterArenas(0),
grayBufferState(GRAY_BUFFER_UNUSED)
grayBufferState(GRAY_BUFFER_UNUSED),
started(false)
{
}

168
js/src/gc/Tracer.h
View File

@ -9,13 +9,12 @@
#include "mozilla/DebugOnly.h"
#include "jsutil.h"
#include "js/GCAPI.h"
#include "js/SliceBudget.h"
#include "js/TracingAPI.h"
namespace js {
class GCMarker;
class ObjectImpl;
namespace gc {
class ArenaHeader;
@ -42,16 +41,19 @@ static const size_t INCREMENTAL_MARK_STACK_BASE_CAPACITY = 32768;
* GCMarker::delayMarkingChildren adds arenas to the stack as necessary while
* markDelayedChildren pops the arenas from the stack until it empties.
*/
template<class T>
struct MarkStack {
T *stack_;
T *tos_;
T *end_;
class MarkStack
{
friend class GCMarker;
uintptr_t *stack_;
uintptr_t *tos_;
uintptr_t *end_;
// The capacity we start with and reset() to.
size_t baseCapacity_;
size_t maxCapacity_;
public:
MarkStack(size_t maxCapacity)
: stack_(nullptr),
tos_(nullptr),
@ -68,51 +70,19 @@ struct MarkStack {
ptrdiff_t position() const { return tos_ - stack_; }
void setStack(T *stack, size_t tosIndex, size_t capacity) {
void setStack(uintptr_t *stack, size_t tosIndex, size_t capacity) {
stack_ = stack;
tos_ = stack + tosIndex;
end_ = stack + capacity;
}
void setBaseCapacity(JSGCMode mode) {
switch (mode) {
case JSGC_MODE_GLOBAL:
case JSGC_MODE_COMPARTMENT:
baseCapacity_ = NON_INCREMENTAL_MARK_STACK_BASE_CAPACITY;
break;
case JSGC_MODE_INCREMENTAL:
baseCapacity_ = INCREMENTAL_MARK_STACK_BASE_CAPACITY;
break;
default:
MOZ_ASSUME_UNREACHABLE("bad gc mode");
}
bool init(JSGCMode gcMode);
if (baseCapacity_ > maxCapacity_)
baseCapacity_ = maxCapacity_;
}
void setBaseCapacity(JSGCMode mode);
size_t maxCapacity() const { return maxCapacity_; }
void setMaxCapacity(size_t maxCapacity);
bool init(JSGCMode gcMode) {
setBaseCapacity(gcMode);
JS_ASSERT(!stack_);
T *newStack = js_pod_malloc<T>(baseCapacity_);
if (!newStack)
return false;
setStack(newStack, 0, baseCapacity_);
return true;
}
void setMaxCapacity(size_t maxCapacity) {
JS_ASSERT(isEmpty());
maxCapacity_ = maxCapacity;
if (baseCapacity_ > maxCapacity_)
baseCapacity_ = maxCapacity_;
reset();
}
bool push(T item) {
bool push(uintptr_t item) {
if (tos_ == end_) {
if (!enlarge(1))
return false;
@ -122,8 +92,8 @@ struct MarkStack {
return true;
}
bool push(T item1, T item2, T item3) {
T *nextTos = tos_ + 3;
bool push(uintptr_t item1, uintptr_t item2, uintptr_t item3) {
uintptr_t *nextTos = tos_ + 3;
if (nextTos > end_) {
if (!enlarge(3))
return false;
@ -141,85 +111,29 @@ struct MarkStack {
return tos_ == stack_;
}
T pop() {
uintptr_t pop() {
JS_ASSERT(!isEmpty());
return *--tos_;
}
void reset() {
if (capacity() == baseCapacity_) {
// No size change; keep the current stack.
setStack(stack_, 0, baseCapacity_);
return;
}
T *newStack = (T *)js_realloc(stack_, sizeof(T) * baseCapacity_);
if (!newStack) {
// If the realloc fails, just keep using the existing stack; it's
// not ideal but better than failing.
newStack = stack_;
baseCapacity_ = capacity();
}
setStack(newStack, 0, baseCapacity_);
}
void reset();
/* Grow the stack, ensuring there is space for at least count elements. */
bool enlarge(unsigned count) {
size_t newCapacity = Min(maxCapacity_, capacity() * 2);
if (newCapacity < capacity() + count)
return false;
bool enlarge(unsigned count);
size_t tosIndex = position();
void setGCMode(JSGCMode gcMode);
T *newStack = (T *)js_realloc(stack_, sizeof(T) * newCapacity);
if (!newStack)
return false;
setStack(newStack, tosIndex, newCapacity);
return true;
}
void setGCMode(JSGCMode gcMode) {
// The mark stack won't be resized until the next call to reset(), but
// that will happen at the end of the next GC.
setBaseCapacity(gcMode);
}
size_t sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const {
return mallocSizeOf(stack_);
}
size_t sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
};
struct GCMarker : public JSTracer {
private:
/*
* We use a common mark stack to mark GC things of different types and use
* the explicit tags to distinguish them when it cannot be deduced from
* the context of push or pop operation.
*/
enum StackTag {
ValueArrayTag,
ObjectTag,
TypeTag,
XmlTag,
SavedValueArrayTag,
JitCodeTag,
LastTag = JitCodeTag
};
static const uintptr_t StackTagMask = 7;
static void staticAsserts() {
JS_STATIC_ASSERT(StackTagMask >= uintptr_t(LastTag));
JS_STATIC_ASSERT(StackTagMask <= gc::CellMask);
}
class GCMarker : public JSTracer
{
public:
explicit GCMarker(JSRuntime *rt);
bool init(JSGCMode gcMode);
void setMaxCapacity(size_t maxCap) { stack.setMaxCapacity(maxCap); }
size_t maxCapacity() const { return stack.maxCapacity_; }
size_t maxCapacity() const { return stack.maxCapacity(); }
void start();
void stop();
@ -295,7 +209,8 @@ struct GCMarker : public JSTracer {
size_t sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
MarkStack<uintptr_t> stack;
/* This is public exclusively for ScanRope. */
MarkStack stack;
private:
#ifdef DEBUG
@ -304,6 +219,25 @@ struct GCMarker : public JSTracer {
void checkZone(void *p) {}
#endif
/*
* We use a common mark stack to mark GC things of different types and use
* the explicit tags to distinguish them when it cannot be deduced from
* the context of push or pop operation.
*/
enum StackTag {
ValueArrayTag,
ObjectTag,
TypeTag,
XmlTag,
SavedValueArrayTag,
JitCodeTag,
LastTag = JitCodeTag
};
static const uintptr_t StackTagMask = 7;
static_assert(StackTagMask >= uintptr_t(LastTag), "The tag mask must subsume the tags.");
static_assert(StackTagMask <= gc::CellMask, "The tag mask must be embeddable in a Cell*.");
void pushTaggedPtr(StackTag tag, void *ptr) {
checkZone(ptr);
uintptr_t addr = reinterpret_cast<uintptr_t>(ptr);
@ -342,21 +276,21 @@ struct GCMarker : public JSTracer {
/* The color is only applied to objects and functions. */
uint32_t color;
mozilla::DebugOnly<bool> started;
/* Pointer to the top of the stack of arenas we are delaying marking on. */
js::gc::ArenaHeader *unmarkedArenaStackTop;
/* Count of arenas that are currently in the stack. */
mozilla::DebugOnly<size_t> markLaterArenas;
enum GrayBufferState
{
enum GrayBufferState {
GRAY_BUFFER_UNUSED,
GRAY_BUFFER_OK,
GRAY_BUFFER_FAILED
};
GrayBufferState grayBufferState;
/* Assert that start and stop are called with correct ordering. */
mozilla::DebugOnly<bool> started;
};
void