1 // Copyright 2016 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "src/parsing/parse-info.h"
6
7 #include "src/ast/ast-source-ranges.h"
8 #include "src/ast/ast-value-factory.h"
9 #include "src/ast/ast.h"
10 #include "src/base/template-utils.h"
11 #include "src/heap/heap-inl.h"
12 #include "src/objects-inl.h"
13 #include "src/objects/scope-info.h"
14 #include "src/zone/zone.h"
15
16 namespace v8 {
17 namespace internal {
18
ParseInfo(Isolate * isolate,AccountingAllocator * zone_allocator)19 ParseInfo::ParseInfo(Isolate* isolate, AccountingAllocator* zone_allocator)
20 : zone_(base::make_unique<Zone>(zone_allocator, ZONE_NAME)),
21 flags_(0),
22 extension_(nullptr),
23 script_scope_(nullptr),
24 unicode_cache_(nullptr),
25 stack_limit_(0),
26 hash_seed_(0),
27 function_kind_(FunctionKind::kNormalFunction),
28 script_id_(-1),
29 start_position_(0),
30 end_position_(0),
31 parameters_end_pos_(kNoSourcePosition),
32 function_literal_id_(FunctionLiteral::kIdTypeInvalid),
33 max_function_literal_id_(FunctionLiteral::kIdTypeInvalid),
34 character_stream_(nullptr),
35 ast_value_factory_(nullptr),
36 ast_string_constants_(nullptr),
37 function_name_(nullptr),
38 runtime_call_stats_(nullptr),
39 source_range_map_(nullptr),
40 literal_(nullptr) {
41 set_hash_seed(isolate->heap()->HashSeed());
42 set_stack_limit(isolate->stack_guard()->real_climit());
43 set_unicode_cache(isolate->unicode_cache());
44 set_runtime_call_stats(isolate->counters()->runtime_call_stats());
45 set_logger(isolate->logger());
46 set_ast_string_constants(isolate->ast_string_constants());
47 if (isolate->is_block_code_coverage()) set_block_coverage_enabled();
48 if (isolate->is_collecting_type_profile()) set_collect_type_profile();
49 }
50
ParseInfo(Isolate * isolate)51 ParseInfo::ParseInfo(Isolate* isolate)
52 : ParseInfo(isolate, isolate->allocator()) {
53 script_id_ = isolate->heap()->NextScriptId();
54 LOG(isolate, ScriptEvent(Logger::ScriptEventType::kReserveId, script_id_));
55 }
56
ParseInfo(Isolate * isolate,Handle<SharedFunctionInfo> shared)57 ParseInfo::ParseInfo(Isolate* isolate, Handle<SharedFunctionInfo> shared)
58 : ParseInfo(isolate, isolate->allocator()) {
59 // Do not support re-parsing top-level function of a wrapped script.
60 // TODO(yangguo): consider whether we need a top-level function in a
61 // wrapped script at all.
62 DCHECK_IMPLIES(is_toplevel(), !Script::cast(shared->script())->is_wrapped());
63
64 set_toplevel(shared->is_toplevel());
65 set_wrapped_as_function(shared->is_wrapped());
66 set_allow_lazy_parsing(FLAG_lazy_inner_functions);
67 set_is_named_expression(shared->is_named_expression());
68 set_start_position(shared->StartPosition());
69 set_end_position(shared->EndPosition());
70 function_literal_id_ = shared->FunctionLiteralId(isolate);
71 set_language_mode(shared->language_mode());
72 set_function_kind(shared->kind());
73 set_declaration(shared->is_declaration());
74 set_requires_instance_fields_initializer(
75 shared->requires_instance_fields_initializer());
76 set_asm_wasm_broken(shared->is_asm_wasm_broken());
77
78 Handle<Script> script(Script::cast(shared->script()), isolate);
79 set_script(script);
80
81 if (shared->HasOuterScopeInfo()) {
82 set_outer_scope_info(handle(shared->GetOuterScopeInfo(), isolate));
83 }
84
85 // CollectTypeProfile uses its own feedback slots. If we have existing
86 // FeedbackMetadata, we can only collect type profile if the feedback vector
87 // has the appropriate slots.
88 set_collect_type_profile(
89 isolate->is_collecting_type_profile() &&
90 (shared->HasFeedbackMetadata()
91 ? shared->feedback_metadata()->HasTypeProfileSlot()
92 : script->IsUserJavaScript()));
93 }
94
ParseInfo(Isolate * isolate,Handle<Script> script)95 ParseInfo::ParseInfo(Isolate* isolate, Handle<Script> script)
96 : ParseInfo(isolate, isolate->allocator()) {
97 SetScriptForToplevelCompile(isolate, script);
98 set_collect_type_profile(isolate->is_collecting_type_profile() &&
99 script->IsUserJavaScript());
100 }
101
~ParseInfo()102 ParseInfo::~ParseInfo() {}
103
scope() const104 DeclarationScope* ParseInfo::scope() const { return literal()->scope(); }
105
EmitBackgroundParseStatisticsOnBackgroundThread()106 void ParseInfo::EmitBackgroundParseStatisticsOnBackgroundThread() {
107 // If runtime call stats was enabled by tracing, emit a trace event at the
108 // end of background parsing on the background thread.
109 if (runtime_call_stats_ &&
110 (FLAG_runtime_stats &
111 v8::tracing::TracingCategoryObserver::ENABLED_BY_TRACING)) {
112 auto value = v8::tracing::TracedValue::Create();
113 runtime_call_stats_->Dump(value.get());
114 TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("v8.runtime_stats"),
115 "V8.RuntimeStats", TRACE_EVENT_SCOPE_THREAD,
116 "runtime-call-stats", std::move(value));
117 }
118 }
119
UpdateBackgroundParseStatisticsOnMainThread(Isolate * isolate)120 void ParseInfo::UpdateBackgroundParseStatisticsOnMainThread(Isolate* isolate) {
121 // Copy over the counters from the background thread to the main counters on
122 // the isolate.
123 RuntimeCallStats* main_call_stats = isolate->counters()->runtime_call_stats();
124 if (FLAG_runtime_stats ==
125 v8::tracing::TracingCategoryObserver::ENABLED_BY_NATIVE) {
126 DCHECK_NE(main_call_stats, runtime_call_stats());
127 DCHECK_NOT_NULL(main_call_stats);
128 DCHECK_NOT_NULL(runtime_call_stats());
129 main_call_stats->Add(runtime_call_stats());
130 }
131 set_runtime_call_stats(main_call_stats);
132 }
133
CreateScript(Isolate * isolate,Handle<String> source,ScriptOriginOptions origin_options,NativesFlag natives)134 Handle<Script> ParseInfo::CreateScript(Isolate* isolate, Handle<String> source,
135 ScriptOriginOptions origin_options,
136 NativesFlag natives) {
137 // Create a script object describing the script to be compiled.
138 Handle<Script> script;
139 if (script_id_ == -1) {
140 script = isolate->factory()->NewScript(source);
141 } else {
142 script = isolate->factory()->NewScriptWithId(source, script_id_);
143 }
144 if (isolate->NeedsSourcePositionsForProfiling()) {
145 Script::InitLineEnds(script);
146 }
147 switch (natives) {
148 case NATIVES_CODE:
149 script->set_type(Script::TYPE_NATIVE);
150 break;
151 case EXTENSION_CODE:
152 script->set_type(Script::TYPE_EXTENSION);
153 break;
154 case INSPECTOR_CODE:
155 script->set_type(Script::TYPE_INSPECTOR);
156 break;
157 case NOT_NATIVES_CODE:
158 break;
159 }
160 script->set_origin_options(origin_options);
161
162 SetScriptForToplevelCompile(isolate, script);
163 return script;
164 }
165
GetOrCreateAstValueFactory()166 AstValueFactory* ParseInfo::GetOrCreateAstValueFactory() {
167 if (!ast_value_factory_.get()) {
168 ast_value_factory_.reset(
169 new AstValueFactory(zone(), ast_string_constants(), hash_seed()));
170 }
171 return ast_value_factory();
172 }
173
AllocateSourceRangeMap()174 void ParseInfo::AllocateSourceRangeMap() {
175 DCHECK(block_coverage_enabled());
176 set_source_range_map(new (zone()) SourceRangeMap(zone()));
177 }
178
ResetCharacterStream()179 void ParseInfo::ResetCharacterStream() { character_stream_.reset(); }
180
set_character_stream(std::unique_ptr<Utf16CharacterStream> character_stream)181 void ParseInfo::set_character_stream(
182 std::unique_ptr<Utf16CharacterStream> character_stream) {
183 DCHECK_NULL(character_stream_);
184 character_stream_.swap(character_stream);
185 }
186
SetScriptForToplevelCompile(Isolate * isolate,Handle<Script> script)187 void ParseInfo::SetScriptForToplevelCompile(Isolate* isolate,
188 Handle<Script> script) {
189 set_script(script);
190 set_allow_lazy_parsing();
191 set_toplevel();
192 set_collect_type_profile(isolate->is_collecting_type_profile() &&
193 script->IsUserJavaScript());
194 set_wrapped_as_function(script->is_wrapped());
195 }
196
set_script(Handle<Script> script)197 void ParseInfo::set_script(Handle<Script> script) {
198 script_ = script;
199 DCHECK(script_id_ == -1 || script_id_ == script->id());
200 script_id_ = script->id();
201
202 set_native(script->type() == Script::TYPE_NATIVE);
203 set_eval(script->compilation_type() == Script::COMPILATION_TYPE_EVAL);
204 set_module(script->origin_options().IsModule());
205 DCHECK(!(is_eval() && is_module()));
206
207 if (block_coverage_enabled() && script->IsUserJavaScript()) {
208 AllocateSourceRangeMap();
209 }
210 }
211
212 } // namespace internal
213 } // namespace v8
214