blob: b8f52307d76cfa60602a80da4536e048fd91a7ea (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
/* -*- 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/Ion.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"
#ifdef JS_CODEGEN_ARM64
# include "jit/arm64/vixl/Cpu-vixl.h"
#endif
#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) {
MOZ_ASSERT(!TlsJitContext.get());
TlsJitContext.set(ctx);
}
JitContext* jit::GetJitContext() {
MOZ_ASSERT(CurrentJitContext());
return CurrentJitContext();
}
JitContext* jit::MaybeGetJitContext() { return CurrentJitContext(); }
JitContext::JitContext(CompileRuntime* rt) : runtime(rt) {
MOZ_ASSERT(rt);
SetJitContext(this);
}
JitContext::JitContext(JSContext* cx)
: cx(cx), runtime(CompileRuntime::get(cx->runtime())) {
SetJitContext(this);
}
JitContext::JitContext() {
#ifdef DEBUG
isCompilingWasm_ = true;
#endif
SetJitContext(this);
}
JitContext::~JitContext() {
MOZ_ASSERT(TlsJitContext.get() == this);
TlsJitContext.set(nullptr);
}
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_X86) || defined(JS_CODEGEN_X64)
// Compute flags.
js::jit::CPUInfo::ComputeFlags();
#endif
#if defined(JS_CODEGEN_ARM)
InitARMFlags();
#endif
#ifdef JS_CODEGEN_ARM64
// Initialize instruction cache flushing.
vixl::CPU::SetUp();
#endif
#ifndef JS_CODEGEN_NONE
MOZ_ASSERT(js::jit::CPUFlagsHaveBeenComputed());
#endif
// Note: jit flags need to be initialized after the InitARMFlags call above.
// This is the final point where we can set disableJitBackend = true, before
// we use this flag below with the HasJitBackend call.
if (!MacroAssembler::SupportsFloatingPoint()) {
JitOptions.disableJitBackend = true;
}
JitOptions.supportsUnalignedAccesses =
MacroAssembler::SupportsUnalignedAccesses();
if (HasJitBackend()) {
if (!InitProcessExecutableMemory()) {
return false;
}
}
PerfSpewer::Init();
return true;
}
void jit::ShutdownJit() {
if (HasJitBackend() && !JSRuntime::hasLiveRuntimes()) {
ReleaseProcessExecutableMemory();
}
}
bool jit::JitSupportsWasmSimd() {
#if defined(ENABLE_WASM_SIMD)
return js::jit::MacroAssembler::SupportsWasmSimd();
#else
return false;
#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
}
|
