mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
523 lines
16 KiB
C++
523 lines
16 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/Scoped.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 <stdio.h>
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#include <execinfo.h>
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#endif
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#include "jstypes.h"
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#include "js/TemplateLib.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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* Pattern used to overwrite freed memory. If you are accessing an object with
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* this pattern, you probably have a dangling pointer.
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*/
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#define JS_FREE_PATTERN 0xDA
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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_ALWAYS_TRUE(expr) MOZ_ALWAYS_TRUE(expr)
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#define JS_ALWAYS_FALSE(expr) MOZ_ALWAYS_FALSE(expr)
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#ifdef DEBUG
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# ifdef JS_THREADSAFE
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# define JS_THREADSAFE_ASSERT(expr) JS_ASSERT(expr)
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# else
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# define JS_THREADSAFE_ASSERT(expr) ((void) 0)
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# endif
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#else
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# define JS_THREADSAFE_ASSERT(expr) ((void) 0)
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#endif
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#if defined(DEBUG)
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# define JS_DIAGNOSTICS_ASSERT(expr) MOZ_ASSERT(expr)
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#elif defined(JS_CRASH_DIAGNOSTICS)
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# define JS_DIAGNOSTICS_ASSERT(expr) do { if (!(expr)) MOZ_CRASH(); } while(0)
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#else
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# define JS_DIAGNOSTICS_ASSERT(expr) ((void) 0)
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#endif
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#define JS_STATIC_ASSERT(cond) MOZ_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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# ifdef DEBUG
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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 builtins/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_DO_BACKTRACES
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#define JS_OOM_BACKTRACE_SIZE 32
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static JS_ALWAYS_INLINE void
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PrintBacktrace()
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{
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void* OOM_trace[JS_OOM_BACKTRACE_SIZE];
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char** OOM_traceSymbols = NULL;
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int32_t OOM_traceSize = 0;
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int32_t OOM_traceIdx = 0;
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OOM_traceSize = backtrace(OOM_trace, JS_OOM_BACKTRACE_SIZE);
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OOM_traceSymbols = backtrace_symbols(OOM_trace, OOM_traceSize);
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if (!OOM_traceSymbols)
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return;
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for (OOM_traceIdx = 0; OOM_traceIdx < OOM_traceSize; ++OOM_traceIdx) {
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fprintf(stderr, "#%d %s\n", OOM_traceIdx, OOM_traceSymbols[OOM_traceIdx]);
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}
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free(OOM_traceSymbols);
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}
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#define JS_OOM_EMIT_BACKTRACE() \
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do {\
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fprintf(stderr, "Forcing artificial memory allocation function failure:\n");\
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PrintBacktrace();\
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} while (0)
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# else
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# define JS_OOM_EMIT_BACKTRACE() do {} while(0)
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#endif /* JS_OOM_DO_BACKTRACES */
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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_EMIT_BACKTRACE();\
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return NULL; \
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} \
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} while (0)
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# define JS_OOM_POSSIBLY_FAIL_REPORT(cx) \
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do \
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{ \
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if (++OOM_counter > OOM_maxAllocations) { \
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JS_OOM_EMIT_BACKTRACE();\
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js_ReportOutOfMemory(cx);\
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return NULL; \
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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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# define JS_OOM_POSSIBLY_FAIL_REPORT(cx) do {} while(0)
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# endif /* DEBUG */
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static JS_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 JS_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 JS_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 JS_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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/*
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* JS_ROTATE_LEFT32
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*
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* There is no rotate operation in the C Language so the construct (a << 4) |
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* (a >> 28) is used instead. Most compilers convert this to a rotate
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* instruction but some versions of MSVC don't without a little help. To get
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* MSVC to generate a rotate instruction, we have to use the _rotl intrinsic
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* and use a pragma to make _rotl inline.
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*
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* MSVC in VS2005 will do an inline rotate instruction on the above construct.
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*/
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#if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_AMD64) || \
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defined(_M_X64))
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#include <stdlib.h>
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#pragma intrinsic(_rotl)
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#define JS_ROTATE_LEFT32(a, bits) _rotl(a, bits)
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#else
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#define JS_ROTATE_LEFT32(a, bits) (((a) << (bits)) | ((a) >> (32 - (bits))))
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#endif
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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 : NULL;
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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() {\
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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) {\
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JS_NEW_BODY(ALLOCATOR, T, (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) {\
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JS_NEW_BODY(ALLOCATOR, T, (p1, 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) {\
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JS_NEW_BODY(ALLOCATOR, T, (p1, p2, 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) {\
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JS_NEW_BODY(ALLOCATOR, T, (p1, p2, p3, 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) {\
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JS_NEW_BODY(ALLOCATOR, T, (p1, p2, p3, p4, 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) {\
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JS_NEW_BODY(ALLOCATOR, T, (p1, p2, p3, p4, p5, 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) {\
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JS_NEW_BODY(ALLOCATOR, T, (p1, p2, p3, p4, p5, p6, 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) {\
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JS_NEW_BODY(ALLOCATOR, T, (p1, p2, p3, p4, p5, p6, p7, 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) {\
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JS_NEW_BODY(ALLOCATOR, T, (p1, p2, p3, p4, p5, p6, p7, p8, 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) {\
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JS_NEW_BODY(ALLOCATOR, T, (p1, p2, p3, p4, p5, p6, p7, p8, p9, 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) {\
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JS_NEW_BODY(ALLOCATOR, T, (p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, 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) {\
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JS_NEW_BODY(ALLOCATOR, T, (p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12))\
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}\
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JS_DECLARE_NEW_METHODS(js_new, js_malloc, static JS_ALWAYS_INLINE)
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template <class T>
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static JS_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 JS_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 JS_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 JS_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 JS_ALWAYS_INLINE T *
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js_pod_malloc(size_t numElems)
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{
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if (numElems & js::tl::MulOverflowMask<sizeof(T)>::result)
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return NULL;
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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 JS_ALWAYS_INLINE T *
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js_pod_calloc(size_t numElems)
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{
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if (numElems & js::tl::MulOverflowMask<sizeof(T)>::result)
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return NULL;
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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 NULL; }
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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
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* expansion of the golden ratio, which starts 1.9E3779B9....
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* This value is especially good if values with consecutive hash codes
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* are stored in a hash table; see Knuth for details.
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*/
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static const HashNumber goldenRatio = 0x9E3779B9U;
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return h * goldenRatio;
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}
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} /* namespace detail */
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} /* namespace js */
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namespace JS {
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/*
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* Methods for poisoning GC heap pointer words and checking for poisoned words.
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* These are in this file for use in Value methods and so forth.
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*
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* If the moving GC hazard analysis is in use and detects a non-rooted stack
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* pointer to a GC thing, one byte of that pointer is poisoned to refer to an
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* invalid location. For both 32 bit and 64 bit systems, the fourth byte of the
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* 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(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(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 */
|