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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* 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/. */
/* Various JS utility functions. */
#include "js/Utility.h"
#include "mozilla/Assertions.h"
#include "mozilla/Atomics.h"
#include "mozilla/Maybe.h"
#include "mozilla/ThreadLocal.h"
#include <stdio.h>
#include "jstypes.h"
#include "util/Poison.h"
#include "util/WindowsWrapper.h"
#include "vm/HelperThreads.h"
using namespace js;
using mozilla::Maybe;
#if defined(DEBUG) || defined(JS_OOM_BREAKPOINT)
/* For OOM testing functionality in Utility.h. */
namespace js {
mozilla::Atomic<AutoEnterOOMUnsafeRegion*> AutoEnterOOMUnsafeRegion::owner_;
namespace oom {
JS_PUBLIC_DATA FailureSimulator simulator;
static MOZ_THREAD_LOCAL(uint32_t) threadType;
bool InitThreadType() { return threadType.init(); }
void SetThreadType(ThreadType type) { threadType.set(type); }
uint32_t GetThreadType(void) { return threadType.get(); }
static inline bool IsHelperThreadType(uint32_t thread) {
return thread != THREAD_TYPE_NONE && thread != THREAD_TYPE_MAIN;
}
void FailureSimulator::simulateFailureAfter(Kind kind, uint64_t checks,
uint32_t thread, bool always) {
Maybe<AutoLockHelperThreadState> lock;
if (IsHelperThreadType(targetThread_) || IsHelperThreadType(thread)) {
lock.emplace();
WaitForAllHelperThreads(lock.ref());
}
MOZ_ASSERT(counter_ + checks > counter_);
MOZ_ASSERT(thread > js::THREAD_TYPE_NONE && thread < js::THREAD_TYPE_MAX);
targetThread_ = thread;
maxChecks_ = counter_ + checks;
failAlways_ = always;
kind_ = kind;
}
void FailureSimulator::reset() {
Maybe<AutoLockHelperThreadState> lock;
if (IsHelperThreadType(targetThread_)) {
lock.emplace();
WaitForAllHelperThreads(lock.ref());
}
targetThread_ = THREAD_TYPE_NONE;
maxChecks_ = UINT64_MAX;
failAlways_ = false;
kind_ = Kind::Nothing;
}
} // namespace oom
} // namespace js
#endif // defined(DEBUG) || defined(JS_OOM_BREAKPOINT)
#if defined(FUZZING)
namespace js {
namespace oom {
JS_PUBLIC_DATA size_t largeAllocLimit = 0;
void InitLargeAllocLimit() {
char* limitStr = getenv("MOZ_FUZZ_LARGE_ALLOC_LIMIT");
if (limitStr) {
largeAllocLimit = atoll(limitStr);
}
}
} // namespace oom
} // namespace js
#endif
#if defined(JS_GC_ALLOW_EXTRA_POISONING)
# if defined(DEBUG)
bool js::gExtraPoisoningEnabled = true;
# else
bool js::gExtraPoisoningEnabled = false;
# endif
#endif
JS_PUBLIC_DATA arena_id_t js::MallocArena;
JS_PUBLIC_DATA arena_id_t js::ArrayBufferContentsArena;
JS_PUBLIC_DATA arena_id_t js::StringBufferArena;
void js::InitMallocAllocator() {
MallocArena = moz_create_arena();
arena_params_t params;
params.mFlags |= ARENA_FLAG_RANDOMIZE_SMALL_ENABLED;
ArrayBufferContentsArena = moz_create_arena_with_params(&params);
StringBufferArena = moz_create_arena_with_params(&params);
}
void js::ShutDownMallocAllocator() {
// Until Bug 1364359 is fixed it is unsafe to call moz_dispose_arena.
// moz_dispose_arena(MallocArena);
// moz_dispose_arena(ArrayBufferContentsArena);
}
extern void js::AssertJSStringBufferInCorrectArena(const void* ptr) {
// `jemalloc_ptr_info()` only exists if MOZ_MEMORY is defined, and it only
// returns an arenaId if MOZ_DEBUG is defined. Otherwise, this function is
// a no-op.
#if defined(MOZ_MEMORY) && defined(MOZ_DEBUG)
if (ptr) {
jemalloc_ptr_info_t ptrInfo{};
jemalloc_ptr_info(ptr, &ptrInfo);
MOZ_ASSERT(ptrInfo.tag != TagUnknown);
MOZ_ASSERT(ptrInfo.arenaId == js::StringBufferArena);
}
#endif
}
JS_PUBLIC_API void JS_Assert(const char* s, const char* file, int ln) {
MOZ_ReportAssertionFailure(s, file, ln);
MOZ_CRASH();
}
#ifdef __linux__
# include <malloc.h>
# include <stdlib.h>
namespace js {
// This function calls all the vanilla heap allocation functions. It is never
// called, and exists purely to help config/check_vanilla_allocations.py. See
// that script for more details.
extern MOZ_COLD void AllTheNonBasicVanillaNewAllocations() {
// posix_memalign and aligned_alloc aren't available on all Linux
// configurations.
// valloc was deprecated in Android 5.0
// char* q;
// posix_memalign((void**)&q, 16, 16);
intptr_t p = intptr_t(malloc(16)) + intptr_t(calloc(1, 16)) +
intptr_t(realloc(nullptr, 16)) + intptr_t(new char) +
intptr_t(new char) + intptr_t(new char) +
intptr_t(new char[16]) + intptr_t(memalign(16, 16)) +
// intptr_t(q) +
// intptr_t(aligned_alloc(16, 16)) +
// intptr_t(valloc(4096)) +
intptr_t(strdup("dummy"));
printf("%u\n", uint32_t(p)); // make sure |p| is not optimized away
free((int*)p); // this would crash if ever actually called
MOZ_CRASH();
}
} // namespace js
#endif // __linux__