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// Copyright 2016 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/parsing/parsing.h"
#include <memory>
#include "src/ast/ast.h"
#include "src/base/v8-fallthrough.h"
#include "src/execution/vm-state-inl.h"
#include "src/handles/maybe-handles.h"
#include "src/objects/objects-inl.h"
#include "src/parsing/parse-info.h"
#include "src/parsing/parser.h"
#include "src/parsing/rewriter.h"
#include "src/parsing/scanner-character-streams.h"
#include "src/zone/zone-list-inl.h" // crbug.com/v8/8816
namespace v8 {
namespace internal {
namespace parsing {
namespace {
void MaybeReportStatistics(ParseInfo* info, Handle<Script> script,
Isolate* isolate, Parser* parser,
ReportStatisticsMode mode) {
switch (mode) {
case ReportStatisticsMode::kYes:
parser->UpdateStatistics(isolate, script);
break;
case ReportStatisticsMode::kNo:
break;
}
}
} // namespace
bool ParseProgram(ParseInfo* info, Handle<Script> script,
MaybeHandle<ScopeInfo> maybe_outer_scope_info,
Isolate* isolate, ReportStatisticsMode mode) {
DCHECK(info->flags().is_toplevel());
DCHECK_NULL(info->literal());
VMState<PARSER> state(isolate);
// Create a character stream for the parser.
Handle<String> source(String::cast(script->source()), isolate);
isolate->counters()->total_parse_size()->Increment(source->length());
std::unique_ptr<Utf16CharacterStream> stream(
ScannerStream::For(isolate, source));
info->set_character_stream(std::move(stream));
Parser parser(isolate->main_thread_local_isolate(), info, script);
// Ok to use Isolate here; this function is only called in the main thread.
DCHECK(parser.parsing_on_main_thread_);
parser.ParseProgram(isolate, script, info, maybe_outer_scope_info);
MaybeReportStatistics(info, script, isolate, &parser, mode);
return info->literal() != nullptr;
}
bool ParseProgram(ParseInfo* info, Handle<Script> script, Isolate* isolate,
ReportStatisticsMode mode) {
return ParseProgram(info, script, kNullMaybeHandle, isolate, mode);
}
bool ParseFunction(ParseInfo* info, Handle<SharedFunctionInfo> shared_info,
Isolate* isolate, ReportStatisticsMode mode) {
DCHECK(!info->flags().is_toplevel());
DCHECK(!shared_info.is_null());
DCHECK_NULL(info->literal());
VMState<PARSER> state(isolate);
// Create a character stream for the parser.
Handle<Script> script(Script::cast(shared_info->script()), isolate);
Handle<String> source(String::cast(script->source()), isolate);
isolate->counters()->total_parse_size()->Increment(source->length());
std::unique_ptr<Utf16CharacterStream> stream(
ScannerStream::For(isolate, source, shared_info->StartPosition(),
shared_info->EndPosition()));
info->set_character_stream(std::move(stream));
Parser parser(isolate->main_thread_local_isolate(), info, script);
// Ok to use Isolate here; this function is only called in the main thread.
DCHECK(parser.parsing_on_main_thread_);
parser.ParseFunction(isolate, info, shared_info);
MaybeReportStatistics(info, script, isolate, &parser, mode);
return info->literal() != nullptr;
}
bool ParseAny(ParseInfo* info, Handle<SharedFunctionInfo> shared_info,
Isolate* isolate, ReportStatisticsMode mode) {
DCHECK(!shared_info.is_null());
if (info->flags().is_toplevel()) {
MaybeHandle<ScopeInfo> maybe_outer_scope_info;
if (shared_info->HasOuterScopeInfo()) {
maybe_outer_scope_info =
handle(shared_info->GetOuterScopeInfo(), isolate);
}
return ParseProgram(info,
handle(Script::cast(shared_info->script()), isolate),
maybe_outer_scope_info, isolate, mode);
}
return ParseFunction(info, shared_info, isolate, mode);
}
} // namespace parsing
} // namespace internal
} // namespace v8
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