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
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
|
// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/wasm/function-compiler.h"
#include "src/codegen/compiler.h"
#include "src/codegen/macro-assembler-inl.h"
#include "src/codegen/optimized-compilation-info.h"
#include "src/compiler/wasm-compiler.h"
#include "src/diagnostics/code-tracer.h"
#include "src/logging/counters.h"
#include "src/logging/log.h"
#include "src/utils/ostreams.h"
#include "src/wasm/baseline/liftoff-compiler.h"
#include "src/wasm/wasm-code-manager.h"
namespace v8 {
namespace internal {
namespace wasm {
namespace {
class WasmInstructionBufferImpl {
public:
class View : public AssemblerBuffer {
public:
View(Vector<uint8_t> buffer, WasmInstructionBufferImpl* holder)
: buffer_(buffer), holder_(holder) {}
~View() override {
if (buffer_.begin() == holder_->old_buffer_.start()) {
DCHECK_EQ(buffer_.size(), holder_->old_buffer_.size());
holder_->old_buffer_ = {};
}
}
byte* start() const override { return buffer_.begin(); }
int size() const override { return static_cast<int>(buffer_.size()); }
std::unique_ptr<AssemblerBuffer> Grow(int new_size) override {
// If we grow, we must be the current buffer of {holder_}.
DCHECK_EQ(buffer_.begin(), holder_->buffer_.start());
DCHECK_EQ(buffer_.size(), holder_->buffer_.size());
DCHECK_NULL(holder_->old_buffer_);
DCHECK_LT(size(), new_size);
holder_->old_buffer_ = std::move(holder_->buffer_);
holder_->buffer_ = OwnedVector<uint8_t>::New(new_size);
return std::make_unique<View>(holder_->buffer_.as_vector(), holder_);
}
private:
const Vector<uint8_t> buffer_;
WasmInstructionBufferImpl* const holder_;
};
explicit WasmInstructionBufferImpl(size_t size)
: buffer_(OwnedVector<uint8_t>::New(size)) {}
std::unique_ptr<AssemblerBuffer> CreateView() {
DCHECK_NOT_NULL(buffer_);
return std::make_unique<View>(buffer_.as_vector(), this);
}
std::unique_ptr<uint8_t[]> ReleaseBuffer() {
DCHECK_NULL(old_buffer_);
DCHECK_NOT_NULL(buffer_);
return buffer_.ReleaseData();
}
bool released() const { return buffer_ == nullptr; }
private:
// The current buffer used to emit code.
OwnedVector<uint8_t> buffer_;
// While the buffer is grown, we need to temporarily also keep the old buffer
// alive.
OwnedVector<uint8_t> old_buffer_;
};
WasmInstructionBufferImpl* Impl(WasmInstructionBuffer* buf) {
return reinterpret_cast<WasmInstructionBufferImpl*>(buf);
}
} // namespace
// PIMPL interface WasmInstructionBuffer for WasmInstBufferImpl
WasmInstructionBuffer::~WasmInstructionBuffer() {
Impl(this)->~WasmInstructionBufferImpl();
}
std::unique_ptr<AssemblerBuffer> WasmInstructionBuffer::CreateView() {
return Impl(this)->CreateView();
}
std::unique_ptr<uint8_t[]> WasmInstructionBuffer::ReleaseBuffer() {
return Impl(this)->ReleaseBuffer();
}
// static
std::unique_ptr<WasmInstructionBuffer> WasmInstructionBuffer::New(size_t size) {
return std::unique_ptr<WasmInstructionBuffer>{
reinterpret_cast<WasmInstructionBuffer*>(new WasmInstructionBufferImpl(
std::max(size_t{AssemblerBase::kMinimalBufferSize}, size)))};
}
// End of PIMPL interface WasmInstructionBuffer for WasmInstBufferImpl
// static
ExecutionTier WasmCompilationUnit::GetBaselineExecutionTier(
const WasmModule* module) {
// Liftoff does not support the special asm.js opcodes, thus always compile
// asm.js modules with TurboFan.
if (is_asmjs_module(module)) return ExecutionTier::kTurbofan;
if (FLAG_wasm_interpret_all) return ExecutionTier::kInterpreter;
return FLAG_liftoff ? ExecutionTier::kLiftoff : ExecutionTier::kTurbofan;
}
WasmCompilationResult WasmCompilationUnit::ExecuteCompilation(
WasmEngine* engine, CompilationEnv* env,
const std::shared_ptr<WireBytesStorage>& wire_bytes_storage,
Counters* counters, WasmFeatures* detected) {
WasmCompilationResult result;
if (func_index_ < static_cast<int>(env->module->num_imported_functions)) {
result = ExecuteImportWrapperCompilation(engine, env);
} else {
result = ExecuteFunctionCompilation(engine, env, wire_bytes_storage,
counters, detected);
}
if (result.succeeded()) {
counters->wasm_generated_code_size()->Increment(
result.code_desc.instr_size);
counters->wasm_reloc_size()->Increment(result.code_desc.reloc_size);
}
result.func_index = func_index_;
result.requested_tier = tier_;
return result;
}
WasmCompilationResult WasmCompilationUnit::ExecuteImportWrapperCompilation(
WasmEngine* engine, CompilationEnv* env) {
const FunctionSig* sig = env->module->functions[func_index_].sig;
// Assume the wrapper is going to be a JS function with matching arity at
// instantiation time.
auto kind = compiler::kDefaultImportCallKind;
bool source_positions = is_asmjs_module(env->module);
WasmCompilationResult result = compiler::CompileWasmImportCallWrapper(
engine, env, kind, sig, source_positions);
return result;
}
WasmCompilationResult WasmCompilationUnit::ExecuteFunctionCompilation(
WasmEngine* wasm_engine, CompilationEnv* env,
const std::shared_ptr<WireBytesStorage>& wire_bytes_storage,
Counters* counters, WasmFeatures* detected) {
auto* func = &env->module->functions[func_index_];
Vector<const uint8_t> code = wire_bytes_storage->GetCode(func->code);
wasm::FunctionBody func_body{func->sig, func->code.offset(), code.begin(),
code.end()};
auto size_histogram = SELECT_WASM_COUNTER(counters, env->module->origin, wasm,
function_size_bytes);
size_histogram->AddSample(static_cast<int>(func_body.end - func_body.start));
auto timed_histogram = SELECT_WASM_COUNTER(counters, env->module->origin,
wasm_compile, function_time);
TimedHistogramScope wasm_compile_function_time_scope(timed_histogram);
if (FLAG_trace_wasm_compiler) {
PrintF("Compiling wasm function %d with %s\n", func_index_,
ExecutionTierToString(tier_));
}
WasmCompilationResult result;
switch (tier_) {
case ExecutionTier::kNone:
UNREACHABLE();
case ExecutionTier::kLiftoff:
// The --wasm-tier-mask-for-testing flag can force functions to be
// compiled with TurboFan, see documentation.
if (V8_LIKELY(FLAG_wasm_tier_mask_for_testing == 0) ||
func_index_ >= 32 ||
((FLAG_wasm_tier_mask_for_testing & (1 << func_index_)) == 0)) {
result =
ExecuteLiftoffCompilation(wasm_engine->allocator(), env, func_body,
func_index_, counters, detected);
if (result.succeeded()) break;
}
// If Liftoff failed, fall back to turbofan.
// TODO(wasm): We could actually stop or remove the tiering unit for this
// function to avoid compiling it twice with TurboFan.
V8_FALLTHROUGH;
case ExecutionTier::kTurbofan:
result = compiler::ExecuteTurbofanWasmCompilation(
wasm_engine, env, func_body, func_index_, counters, detected);
break;
case ExecutionTier::kInterpreter:
result = compiler::ExecuteInterpreterEntryCompilation(
wasm_engine, env, func_body, func_index_, counters, detected);
break;
}
return result;
}
namespace {
bool must_record_function_compilation(Isolate* isolate) {
return isolate->logger()->is_listening_to_code_events() ||
isolate->is_profiling();
}
PRINTF_FORMAT(3, 4)
void RecordWasmHeapStubCompilation(Isolate* isolate, Handle<Code> code,
const char* format, ...) {
DCHECK(must_record_function_compilation(isolate));
ScopedVector<char> buffer(128);
va_list arguments;
va_start(arguments, format);
int len = VSNPrintF(buffer, format, arguments);
CHECK_LT(0, len);
va_end(arguments);
Handle<String> name_str =
isolate->factory()->NewStringFromAsciiChecked(buffer.begin());
PROFILE(isolate, CodeCreateEvent(CodeEventListener::STUB_TAG,
Handle<AbstractCode>::cast(code), name_str));
}
} // namespace
// static
void WasmCompilationUnit::CompileWasmFunction(Isolate* isolate,
NativeModule* native_module,
WasmFeatures* detected,
const WasmFunction* function,
ExecutionTier tier) {
ModuleWireBytes wire_bytes(native_module->wire_bytes());
FunctionBody function_body{function->sig, function->code.offset(),
wire_bytes.start() + function->code.offset(),
wire_bytes.start() + function->code.end_offset()};
DCHECK_LE(native_module->num_imported_functions(), function->func_index);
DCHECK_LT(function->func_index, native_module->num_functions());
WasmCompilationUnit unit(function->func_index, tier);
CompilationEnv env = native_module->CreateCompilationEnv();
WasmCompilationResult result = unit.ExecuteCompilation(
isolate->wasm_engine(), &env,
native_module->compilation_state()->GetWireBytesStorage(),
isolate->counters(), detected);
if (result.succeeded()) {
WasmCodeRefScope code_ref_scope;
native_module->AddCompiledCode(std::move(result));
} else {
native_module->compilation_state()->SetError();
}
}
JSToWasmWrapperCompilationUnit::JSToWasmWrapperCompilationUnit(
Isolate* isolate, WasmEngine* wasm_engine, const FunctionSig* sig,
bool is_import, const WasmFeatures& enabled_features)
: is_import_(is_import),
sig_(sig),
job_(compiler::NewJSToWasmCompilationJob(isolate, wasm_engine, sig,
is_import, enabled_features)) {}
JSToWasmWrapperCompilationUnit::~JSToWasmWrapperCompilationUnit() = default;
void JSToWasmWrapperCompilationUnit::Execute() {
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.wasm"), "CompileJSToWasmWrapper");
CompilationJob::Status status = job_->ExecuteJob(nullptr);
CHECK_EQ(status, CompilationJob::SUCCEEDED);
}
Handle<Code> JSToWasmWrapperCompilationUnit::Finalize(Isolate* isolate) {
CompilationJob::Status status = job_->FinalizeJob(isolate);
CHECK_EQ(status, CompilationJob::SUCCEEDED);
Handle<Code> code = job_->compilation_info()->code();
if (must_record_function_compilation(isolate)) {
RecordWasmHeapStubCompilation(
isolate, code, "%s", job_->compilation_info()->GetDebugName().get());
}
return code;
}
// static
Handle<Code> JSToWasmWrapperCompilationUnit::CompileJSToWasmWrapper(
Isolate* isolate, const FunctionSig* sig, bool is_import) {
// Run the compilation unit synchronously.
WasmFeatures enabled_features = WasmFeatures::FromIsolate(isolate);
JSToWasmWrapperCompilationUnit unit(isolate, isolate->wasm_engine(), sig,
is_import, enabled_features);
unit.Execute();
return unit.Finalize(isolate);
}
} // namespace wasm
} // namespace internal
} // namespace v8
|