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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/. */
#include "jit/JitContext.h"
#include "mozilla/Assertions.h"
#include "mozilla/ThreadLocal.h"
#include <stdlib.h>
#include "jit/CacheIRSpewer.h"
#include "jit/CompileWrappers.h"
#include "jit/JitCode.h"
#include "jit/JitOptions.h"
#include "jit/JitSpewer.h"
#include "jit/MacroAssembler.h"
#include "jit/PerfSpewer.h"
#include "js/HeapAPI.h"
#include "vm/JSContext.h"
#if defined(ANDROID)
# include <sys/system_properties.h>
#endif
using namespace js;
using namespace js::jit;
namespace js::jit {
class TempAllocator;
}
// Assert that JitCode is gc::Cell aligned.
static_assert(sizeof(JitCode) % gc::CellAlignBytes == 0);
static MOZ_THREAD_LOCAL(JitContext*) TlsJitContext;
static JitContext* CurrentJitContext() {
if (!TlsJitContext.init()) {
return nullptr;
}
return TlsJitContext.get();
}
void jit::SetJitContext(JitContext* ctx) { TlsJitContext.set(ctx); }
JitContext* jit::GetJitContext() {
MOZ_ASSERT(CurrentJitContext());
return CurrentJitContext();
}
JitContext* jit::MaybeGetJitContext() { return CurrentJitContext(); }
JitContext::JitContext(CompileRuntime* rt, CompileRealm* realm,
TempAllocator* temp)
: prev_(CurrentJitContext()), realm_(realm), temp(temp), runtime(rt) {
MOZ_ASSERT(rt);
MOZ_ASSERT(realm);
MOZ_ASSERT(temp);
SetJitContext(this);
}
JitContext::JitContext(JSContext* cx, TempAllocator* temp)
: prev_(CurrentJitContext()),
realm_(CompileRealm::get(cx->realm())),
cx(cx),
temp(temp),
runtime(CompileRuntime::get(cx->runtime())) {
SetJitContext(this);
}
JitContext::JitContext(TempAllocator* temp)
: prev_(CurrentJitContext()), temp(temp) {
#ifdef DEBUG
isCompilingWasm_ = true;
#endif
SetJitContext(this);
}
JitContext::JitContext() : JitContext(nullptr) {}
JitContext::~JitContext() { SetJitContext(prev_); }
bool jit::InitializeJit() {
if (!TlsJitContext.init()) {
return false;
}
CheckLogging();
#ifdef JS_CACHEIR_SPEW
const char* env = getenv("CACHEIR_LOGS");
if (env && env[0] && env[0] != '0') {
CacheIRSpewer::singleton().init(env);
}
#endif
#if defined(JS_CODEGEN_ARM)
InitARMFlags();
#endif
// Note: jit flags need to be initialized after the InitARMFlags call above.
ComputeJitSupportFlags();
CheckPerf();
return true;
}
void jit::ComputeJitSupportFlags() {
JitOptions.supportsFloatingPoint = MacroAssembler::SupportsFloatingPoint();
JitOptions.supportsUnalignedAccesses =
MacroAssembler::SupportsUnalignedAccesses();
}
bool jit::JitSupportsWasmSimd() {
#if defined(ENABLE_WASM_SIMD)
return js::jit::MacroAssembler::SupportsWasmSimd();
#else
MOZ_CRASH("Do not call");
#endif
}
bool jit::JitSupportsAtomics() {
#if defined(JS_CODEGEN_ARM)
// Bug 1146902, bug 1077318: Enable Ion inlining of Atomics
// operations on ARM only when the CPU has byte, halfword, and
// doubleword load-exclusive and store-exclusive instructions,
// until we can add support for systems that don't have those.
return js::jit::HasLDSTREXBHD();
#else
return true;
#endif
}
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