mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
540 lines
19 KiB
C++
540 lines
19 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef js_Utility_h
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#define js_Utility_h
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#include "mozilla/Assertions.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/Compiler.h"
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#include "mozilla/Move.h"
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#include "mozilla/NullPtr.h"
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#include "mozilla/Scoped.h"
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#include "mozilla/TemplateLib.h"
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#include <stdlib.h>
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#include <string.h>
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#ifdef JS_OOM_DO_BACKTRACES
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#include <execinfo.h>
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#include <stdio.h>
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#endif
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#include "jstypes.h"
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/* The public JS engine namespace. */
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namespace JS {}
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/* The mozilla-shared reusable template/utility namespace. */
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namespace mozilla {}
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/* The private JS engine namespace. */
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namespace js {}
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/*
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* Patterns used by SpiderMonkey to overwrite unused memory. If you are
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* accessing an object with one of these pattern, you probably have a dangling
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* pointer.
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*/
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#define JS_FRESH_NURSERY_PATTERN 0x2F
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#define JS_SWEPT_NURSERY_PATTERN 0x2B
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#define JS_ALLOCATED_NURSERY_PATTERN 0x2D
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#define JS_FRESH_TENURED_PATTERN 0x4F
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#define JS_SWEPT_TENURED_PATTERN 0x4B
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#define JS_ALLOCATED_TENURED_PATTERN 0x4D
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#define JS_SWEPT_CODE_PATTERN 0x3b
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#define JS_SWEPT_FRAME_PATTERN 0x5b
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#define JS_ASSERT(expr) MOZ_ASSERT(expr)
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#define JS_ASSERT_IF(cond, expr) MOZ_ASSERT_IF(cond, expr)
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#define JS_STATIC_ASSERT(cond) static_assert(cond, "JS_STATIC_ASSERT")
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#define JS_STATIC_ASSERT_IF(cond, expr) MOZ_STATIC_ASSERT_IF(cond, expr, "JS_STATIC_ASSERT_IF")
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extern MOZ_NORETURN JS_PUBLIC_API(void)
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JS_Assert(const char *s, const char *file, int ln);
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/*
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* Abort the process in a non-graceful manner. This will cause a core file,
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* call to the debugger or other moral equivalent as well as causing the
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* entire process to stop.
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*/
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extern JS_PUBLIC_API(void) JS_Abort(void);
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/*
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* Custom allocator support for SpiderMonkey
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*/
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#if defined JS_USE_CUSTOM_ALLOCATOR
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# include "jscustomallocator.h"
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#else
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# if defined(DEBUG) || defined(JS_OOM_BREAKPOINT)
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/*
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* In order to test OOM conditions, when the testing function
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* oomAfterAllocations COUNT is passed, we fail continuously after the NUM'th
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* allocation from now.
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*/
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extern JS_PUBLIC_DATA(uint32_t) OOM_maxAllocations; /* set in builtin/TestingFunctions.cpp */
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extern JS_PUBLIC_DATA(uint32_t) OOM_counter; /* data race, who cares. */
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#ifdef JS_OOM_BREAKPOINT
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static MOZ_NEVER_INLINE void js_failedAllocBreakpoint() { asm(""); }
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#define JS_OOM_CALL_BP_FUNC() js_failedAllocBreakpoint()
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#else
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#define JS_OOM_CALL_BP_FUNC() do {} while(0)
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#endif
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# define JS_OOM_POSSIBLY_FAIL() \
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do \
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{ \
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if (++OOM_counter > OOM_maxAllocations) { \
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JS_OOM_CALL_BP_FUNC();\
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return nullptr; \
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} \
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} while (0)
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# else
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# define JS_OOM_POSSIBLY_FAIL() do {} while(0)
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# endif /* DEBUG || JS_OOM_BREAKPOINT */
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static inline void* js_malloc(size_t bytes)
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{
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JS_OOM_POSSIBLY_FAIL();
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return malloc(bytes);
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}
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static inline void* js_calloc(size_t bytes)
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{
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JS_OOM_POSSIBLY_FAIL();
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return calloc(bytes, 1);
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}
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static inline void* js_calloc(size_t nmemb, size_t size)
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{
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JS_OOM_POSSIBLY_FAIL();
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return calloc(nmemb, size);
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}
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static inline void* js_realloc(void* p, size_t bytes)
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{
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JS_OOM_POSSIBLY_FAIL();
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return realloc(p, bytes);
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}
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static inline void js_free(void* p)
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{
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free(p);
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}
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#endif/* JS_USE_CUSTOM_ALLOCATOR */
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#include <new>
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/*
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* Low-level memory management in SpiderMonkey:
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*
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* ** Do not use the standard malloc/free/realloc: SpiderMonkey allows these
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* to be redefined (via JS_USE_CUSTOM_ALLOCATOR) and Gecko even #define's
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* these symbols.
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*
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* ** Do not use the builtin C++ operator new and delete: these throw on
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* error and we cannot override them not to.
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*
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* Allocation:
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*
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* - If the lifetime of the allocation is tied to the lifetime of a GC-thing
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* (that is, finalizing the GC-thing will free the allocation), call one of
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* the following functions:
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*
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* JSContext::{malloc_,realloc_,calloc_,new_}
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* JSRuntime::{malloc_,realloc_,calloc_,new_}
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*
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* These functions accumulate the number of bytes allocated which is used as
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* part of the GC-triggering heuristic.
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*
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* The difference between the JSContext and JSRuntime versions is that the
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* cx version reports an out-of-memory error on OOM. (This follows from the
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* general SpiderMonkey idiom that a JSContext-taking function reports its
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* own errors.)
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*
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* - Otherwise, use js_malloc/js_realloc/js_calloc/js_free/js_new
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*
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* Deallocation:
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*
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* - Ordinarily, use js_free/js_delete.
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*
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* - For deallocations during GC finalization, use one of the following
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* operations on the FreeOp provided to the finalizer:
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*
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* FreeOp::{free_,delete_}
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*
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* The advantage of these operations is that the memory is batched and freed
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* on another thread.
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*/
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#define JS_NEW_BODY(allocator, t, parms) \
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void *memory = allocator(sizeof(t)); \
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return memory ? new(memory) t parms : nullptr;
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/*
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* Given a class which should provide 'new' methods, add
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* JS_DECLARE_NEW_METHODS (see JSContext for a usage example). This
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* adds news with up to 12 parameters. Add more versions of new below if
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* you need more than 12 parameters.
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*
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* Note: Do not add a ; at the end of a use of JS_DECLARE_NEW_METHODS,
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* or the build will break.
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*/
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#define JS_DECLARE_NEW_METHODS(NEWNAME, ALLOCATOR, QUALIFIERS)\
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template <class T>\
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QUALIFIERS T *NEWNAME() MOZ_HEAP_ALLOCATOR {\
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JS_NEW_BODY(ALLOCATOR, T, ())\
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}\
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\
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template <class T, class P1>\
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QUALIFIERS T *NEWNAME(P1 &&p1) MOZ_HEAP_ALLOCATOR {\
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JS_NEW_BODY(ALLOCATOR, T,\
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(mozilla::Forward<P1>(p1)))\
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}\
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\
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template <class T, class P1, class P2>\
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QUALIFIERS T *NEWNAME(P1 &&p1, P2 &&p2) MOZ_HEAP_ALLOCATOR {\
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JS_NEW_BODY(ALLOCATOR, T,\
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(mozilla::Forward<P1>(p1),\
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mozilla::Forward<P2>(p2)))\
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}\
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\
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template <class T, class P1, class P2, class P3>\
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QUALIFIERS T *NEWNAME(P1 &&p1, P2 &&p2, P3 &&p3) MOZ_HEAP_ALLOCATOR {\
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JS_NEW_BODY(ALLOCATOR, T,\
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(mozilla::Forward<P1>(p1),\
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mozilla::Forward<P2>(p2),\
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mozilla::Forward<P3>(p3)))\
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}\
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\
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template <class T, class P1, class P2, class P3, class P4>\
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QUALIFIERS T *NEWNAME(P1 &&p1, P2 &&p2, P3 &&p3, P4 &&p4) MOZ_HEAP_ALLOCATOR {\
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JS_NEW_BODY(ALLOCATOR, T,\
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(mozilla::Forward<P1>(p1),\
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mozilla::Forward<P2>(p2),\
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mozilla::Forward<P3>(p3),\
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mozilla::Forward<P4>(p4)))\
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}\
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\
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template <class T, class P1, class P2, class P3, class P4, class P5>\
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QUALIFIERS T *NEWNAME(P1 &&p1, P2 &&p2, P3 &&p3, P4 &&p4, P5 &&p5) MOZ_HEAP_ALLOCATOR {\
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JS_NEW_BODY(ALLOCATOR, T,\
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(mozilla::Forward<P1>(p1),\
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mozilla::Forward<P2>(p2),\
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mozilla::Forward<P3>(p3),\
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mozilla::Forward<P4>(p4),\
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mozilla::Forward<P5>(p5)))\
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}\
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\
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template <class T, class P1, class P2, class P3, class P4, class P5, class P6>\
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QUALIFIERS T *NEWNAME(P1 &&p1, P2 &&p2, P3 &&p3, P4 &&p4, P5 &&p5, P6 &&p6) MOZ_HEAP_ALLOCATOR {\
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JS_NEW_BODY(ALLOCATOR, T,\
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(mozilla::Forward<P1>(p1),\
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mozilla::Forward<P2>(p2),\
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mozilla::Forward<P3>(p3),\
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mozilla::Forward<P4>(p4),\
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mozilla::Forward<P5>(p5),\
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mozilla::Forward<P6>(p6)))\
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}\
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\
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template <class T, class P1, class P2, class P3, class P4, class P5, class P6, class P7>\
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QUALIFIERS T *NEWNAME(P1 &&p1, P2 &&p2, P3 &&p3, P4 &&p4, P5 &&p5, P6 &&p6, P7 &&p7) MOZ_HEAP_ALLOCATOR {\
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JS_NEW_BODY(ALLOCATOR, T,\
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(mozilla::Forward<P1>(p1),\
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mozilla::Forward<P2>(p2),\
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mozilla::Forward<P3>(p3),\
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mozilla::Forward<P4>(p4),\
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mozilla::Forward<P5>(p5),\
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mozilla::Forward<P6>(p6),\
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mozilla::Forward<P7>(p7)))\
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}\
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\
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template <class T, class P1, class P2, class P3, class P4, class P5, class P6, class P7, class P8>\
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QUALIFIERS T *NEWNAME(P1 &&p1, P2 &&p2, P3 &&p3, P4 &&p4, P5 &&p5, P6 &&p6, P7 &&p7, P8 &&p8) MOZ_HEAP_ALLOCATOR {\
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JS_NEW_BODY(ALLOCATOR, T,\
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(mozilla::Forward<P1>(p1),\
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mozilla::Forward<P2>(p2),\
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mozilla::Forward<P3>(p3),\
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mozilla::Forward<P4>(p4),\
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mozilla::Forward<P5>(p5),\
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mozilla::Forward<P6>(p6),\
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mozilla::Forward<P7>(p7),\
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mozilla::Forward<P8>(p8)))\
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}\
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\
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template <class T, class P1, class P2, class P3, class P4, class P5, class P6, class P7, class P8, class P9>\
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QUALIFIERS T *NEWNAME(P1 &&p1, P2 &&p2, P3 &&p3, P4 &&p4, P5 &&p5, P6 &&p6, P7 &&p7, P8 &&p8, P9 &&p9) MOZ_HEAP_ALLOCATOR {\
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JS_NEW_BODY(ALLOCATOR, T,\
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(mozilla::Forward<P1>(p1),\
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mozilla::Forward<P2>(p2),\
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mozilla::Forward<P3>(p3),\
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mozilla::Forward<P4>(p4),\
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mozilla::Forward<P5>(p5),\
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mozilla::Forward<P6>(p6),\
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mozilla::Forward<P7>(p7),\
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mozilla::Forward<P8>(p8),\
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mozilla::Forward<P9>(p9)))\
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}\
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\
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template <class T, class P1, class P2, class P3, class P4, class P5, class P6, class P7, class P8, class P9, class P10>\
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QUALIFIERS T *NEWNAME(P1 &&p1, P2 &&p2, P3 &&p3, P4 &&p4, P5 &&p5, P6 &&p6, P7 &&p7, P8 &&p8, P9 &&p9, P10 &&p10) MOZ_HEAP_ALLOCATOR {\
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JS_NEW_BODY(ALLOCATOR, T,\
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(mozilla::Forward<P1>(p1),\
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mozilla::Forward<P2>(p2),\
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mozilla::Forward<P3>(p3),\
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mozilla::Forward<P4>(p4),\
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mozilla::Forward<P5>(p5),\
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mozilla::Forward<P6>(p6),\
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mozilla::Forward<P7>(p7),\
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mozilla::Forward<P8>(p8),\
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mozilla::Forward<P9>(p9),\
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mozilla::Forward<P10>(p10)))\
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}\
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\
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template <class T, class P1, class P2, class P3, class P4, class P5, class P6, class P7, class P8, class P9, class P10, class P11>\
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QUALIFIERS T *NEWNAME(P1 &&p1, P2 &&p2, P3 &&p3, P4 &&p4, P5 &&p5, P6 &&p6, P7 &&p7, P8 &&p8, P9 &&p9, P10 &&p10, P11 &&p11) MOZ_HEAP_ALLOCATOR {\
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JS_NEW_BODY(ALLOCATOR, T,\
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(mozilla::Forward<P1>(p1),\
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mozilla::Forward<P2>(p2),\
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mozilla::Forward<P3>(p3),\
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mozilla::Forward<P4>(p4),\
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mozilla::Forward<P5>(p5),\
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mozilla::Forward<P6>(p6),\
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mozilla::Forward<P7>(p7),\
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mozilla::Forward<P8>(p8),\
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mozilla::Forward<P9>(p9),\
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mozilla::Forward<P10>(p10),\
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mozilla::Forward<P11>(p11)))\
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}\
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\
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template <class T, class P1, class P2, class P3, class P4, class P5, class P6, class P7, class P8, class P9, class P10, class P11, class P12>\
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QUALIFIERS T *NEWNAME(P1 &&p1, P2 &&p2, P3 &&p3, P4 &&p4, P5 &&p5, P6 &&p6, P7 &&p7, P8 &&p8, P9 &&p9, P10 &&p10, P11 &&p11, P12 &&p12) MOZ_HEAP_ALLOCATOR {\
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JS_NEW_BODY(ALLOCATOR, T,\
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(mozilla::Forward<P1>(p1),\
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mozilla::Forward<P2>(p2),\
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mozilla::Forward<P3>(p3),\
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mozilla::Forward<P4>(p4),\
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mozilla::Forward<P5>(p5),\
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mozilla::Forward<P6>(p6),\
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mozilla::Forward<P7>(p7),\
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mozilla::Forward<P8>(p8),\
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mozilla::Forward<P9>(p9),\
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mozilla::Forward<P10>(p10),\
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mozilla::Forward<P11>(p11),\
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mozilla::Forward<P12>(p12)))\
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}\
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JS_DECLARE_NEW_METHODS(js_new, js_malloc, static MOZ_ALWAYS_INLINE)
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template <class T>
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static MOZ_ALWAYS_INLINE void
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js_delete(T *p)
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{
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if (p) {
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p->~T();
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js_free(p);
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}
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}
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template<class T>
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static MOZ_ALWAYS_INLINE void
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js_delete_poison(T *p)
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{
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if (p) {
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p->~T();
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memset(p, 0x3B, sizeof(T));
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js_free(p);
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}
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}
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template <class T>
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static MOZ_ALWAYS_INLINE T *
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js_pod_malloc()
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{
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return (T *)js_malloc(sizeof(T));
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}
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template <class T>
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static MOZ_ALWAYS_INLINE T *
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js_pod_calloc()
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{
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return (T *)js_calloc(sizeof(T));
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}
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template <class T>
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static MOZ_ALWAYS_INLINE T *
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js_pod_malloc(size_t numElems)
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{
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if (numElems & mozilla::tl::MulOverflowMask<sizeof(T)>::value)
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return nullptr;
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return (T *)js_malloc(numElems * sizeof(T));
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}
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template <class T>
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static MOZ_ALWAYS_INLINE T *
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js_pod_calloc(size_t numElems)
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{
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if (numElems & mozilla::tl::MulOverflowMask<sizeof(T)>::value)
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return nullptr;
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return (T *)js_calloc(numElems * sizeof(T));
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}
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namespace js {
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template<typename T>
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struct ScopedFreePtrTraits
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{
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typedef T* type;
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static T* empty() { return nullptr; }
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static void release(T* ptr) { js_free(ptr); }
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};
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SCOPED_TEMPLATE(ScopedJSFreePtr, ScopedFreePtrTraits)
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template <typename T>
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struct ScopedDeletePtrTraits : public ScopedFreePtrTraits<T>
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{
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static void release(T *ptr) { js_delete(ptr); }
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};
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SCOPED_TEMPLATE(ScopedJSDeletePtr, ScopedDeletePtrTraits)
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template <typename T>
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struct ScopedReleasePtrTraits : public ScopedFreePtrTraits<T>
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{
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static void release(T *ptr) { if (ptr) ptr->release(); }
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};
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SCOPED_TEMPLATE(ScopedReleasePtr, ScopedReleasePtrTraits)
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} /* namespace js */
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namespace js {
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/* Integral types for all hash functions. */
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typedef uint32_t HashNumber;
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const unsigned HashNumberSizeBits = 32;
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namespace detail {
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/*
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* Given a raw hash code, h, return a number that can be used to select a hash
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* bucket.
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*
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* This function aims to produce as uniform an output distribution as possible,
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* especially in the most significant (leftmost) bits, even though the input
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* distribution may be highly nonrandom, given the constraints that this must
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* be deterministic and quick to compute.
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*
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* Since the leftmost bits of the result are best, the hash bucket index is
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* computed by doing ScrambleHashCode(h) / (2^32/N) or the equivalent
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* right-shift, not ScrambleHashCode(h) % N or the equivalent bit-mask.
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*
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* FIXME: OrderedHashTable uses a bit-mask; see bug 775896.
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*/
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inline HashNumber
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ScrambleHashCode(HashNumber h)
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{
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/*
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* Simply returning h would not cause any hash tables to produce wrong
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* answers. But it can produce pathologically bad performance: The caller
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* right-shifts the result, keeping only the highest bits. The high bits of
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* hash codes are very often completely entropy-free. (So are the lowest
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* bits.)
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*
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* So we use Fibonacci hashing, as described in Knuth, The Art of Computer
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* Programming, 6.4. This mixes all the bits of the input hash code h.
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*
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* The value of goldenRatio is taken from the hex
|
|
* expansion of the golden ratio, which starts 1.9E3779B9....
|
|
* This value is especially good if values with consecutive hash codes
|
|
* are stored in a hash table; see Knuth for details.
|
|
*/
|
|
static const HashNumber goldenRatio = 0x9E3779B9U;
|
|
return h * goldenRatio;
|
|
}
|
|
|
|
} /* namespace detail */
|
|
|
|
} /* namespace js */
|
|
|
|
namespace JS {
|
|
|
|
/*
|
|
* Methods for poisoning GC heap pointer words and checking for poisoned words.
|
|
* These are in this file for use in Value methods and so forth.
|
|
*
|
|
* If the moving GC hazard analysis is in use and detects a non-rooted stack
|
|
* pointer to a GC thing, one byte of that pointer is poisoned to refer to an
|
|
* invalid location. For both 32 bit and 64 bit systems, the fourth byte of the
|
|
* pointer is overwritten, to reduce the likelihood of accidentally changing
|
|
* a live integer value.
|
|
*/
|
|
|
|
inline void PoisonPtr(void *v)
|
|
{
|
|
#if defined(JSGC_ROOT_ANALYSIS) && defined(JS_DEBUG)
|
|
uint8_t *ptr = (uint8_t *) v + 3;
|
|
*ptr = JS_FREE_PATTERN;
|
|
#endif
|
|
}
|
|
|
|
template <typename T>
|
|
inline bool IsPoisonedPtr(T *v)
|
|
{
|
|
#if defined(JSGC_ROOT_ANALYSIS) && defined(JS_DEBUG)
|
|
uint32_t mask = uintptr_t(v) & 0xff000000;
|
|
return mask == uint32_t(JS_FREE_PATTERN << 24);
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
}
|
|
|
|
/* sixgill annotation defines */
|
|
#ifndef HAVE_STATIC_ANNOTATIONS
|
|
# define HAVE_STATIC_ANNOTATIONS
|
|
# ifdef XGILL_PLUGIN
|
|
# define STATIC_PRECONDITION(COND) __attribute__((precondition(#COND)))
|
|
# define STATIC_PRECONDITION_ASSUME(COND) __attribute__((precondition_assume(#COND)))
|
|
# define STATIC_POSTCONDITION(COND) __attribute__((postcondition(#COND)))
|
|
# define STATIC_POSTCONDITION_ASSUME(COND) __attribute__((postcondition_assume(#COND)))
|
|
# define STATIC_INVARIANT(COND) __attribute__((invariant(#COND)))
|
|
# define STATIC_INVARIANT_ASSUME(COND) __attribute__((invariant_assume(#COND)))
|
|
# define STATIC_PASTE2(X,Y) X ## Y
|
|
# define STATIC_PASTE1(X,Y) STATIC_PASTE2(X,Y)
|
|
# define STATIC_ASSERT(COND) \
|
|
JS_BEGIN_MACRO \
|
|
__attribute__((assert_static(#COND), unused)) \
|
|
int STATIC_PASTE1(assert_static_, __COUNTER__); \
|
|
JS_END_MACRO
|
|
# define STATIC_ASSUME(COND) \
|
|
JS_BEGIN_MACRO \
|
|
__attribute__((assume_static(#COND), unused)) \
|
|
int STATIC_PASTE1(assume_static_, __COUNTER__); \
|
|
JS_END_MACRO
|
|
# define STATIC_ASSERT_RUNTIME(COND) \
|
|
JS_BEGIN_MACRO \
|
|
__attribute__((assert_static_runtime(#COND), unused)) \
|
|
int STATIC_PASTE1(assert_static_runtime_, __COUNTER__); \
|
|
JS_END_MACRO
|
|
# else /* XGILL_PLUGIN */
|
|
# define STATIC_PRECONDITION(COND) /* nothing */
|
|
# define STATIC_PRECONDITION_ASSUME(COND) /* nothing */
|
|
# define STATIC_POSTCONDITION(COND) /* nothing */
|
|
# define STATIC_POSTCONDITION_ASSUME(COND) /* nothing */
|
|
# define STATIC_INVARIANT(COND) /* nothing */
|
|
# define STATIC_INVARIANT_ASSUME(COND) /* nothing */
|
|
# define STATIC_ASSERT(COND) JS_BEGIN_MACRO /* nothing */ JS_END_MACRO
|
|
# define STATIC_ASSUME(COND) JS_BEGIN_MACRO /* nothing */ JS_END_MACRO
|
|
# define STATIC_ASSERT_RUNTIME(COND) JS_BEGIN_MACRO /* nothing */ JS_END_MACRO
|
|
# endif /* XGILL_PLUGIN */
|
|
# define STATIC_SKIP_INFERENCE STATIC_INVARIANT(skip_inference())
|
|
#endif /* HAVE_STATIC_ANNOTATIONS */
|
|
|
|
#endif /* js_Utility_h */
|