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      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 
     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 
     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 
     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 
     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 
    102 ParseInfo::~ParseInfo() {}
    103 
    104 DeclarationScope* ParseInfo::scope() const { return literal()->scope(); }
    105 
    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 
    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 
    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 
    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 
    174 void ParseInfo::AllocateSourceRangeMap() {
    175   DCHECK(block_coverage_enabled());
    176   set_source_range_map(new (zone()) SourceRangeMap(zone()));
    177 }
    178 
    179 void ParseInfo::ResetCharacterStream() { character_stream_.reset(); }
    180 
    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 
    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 
    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