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Unified Diff: src/parser.cc

Issue 894683003: Introduce LanguageMode, drop StrictMode. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: rebased (w/ conflicts) Created 5 years, 10 months ago
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Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 1817944f0d82c3044b4536d2041a43f43df9059f..0dbfe5d18522d4799207318a42f22f879fd08f35 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -288,7 +288,8 @@ FunctionLiteral* Parser::DefaultConstructor(bool call_super, Scope* scope,
Scope* function_scope =
NewScope(scope, FUNCTION_SCOPE, FunctionKind::kDefaultConstructor);
- function_scope->SetStrictMode(STRICT);
+ function_scope->SetLanguageMode(
+ static_cast<LanguageMode>(scope->language_mode() | STRICT));
// Set start and end position to the same value
function_scope->set_start_position(pos);
function_scope->set_end_position(pos);
@@ -924,7 +925,7 @@ FunctionLiteral* Parser::DoParseProgram(CompilationInfo* info, Scope** scope,
}
original_scope_ = *scope;
if (info->is_eval()) {
- if (!(*scope)->is_script_scope() || info->strict_mode() == STRICT) {
+ if (!(*scope)->is_script_scope() || is_strict(info->language_mode())) {
*scope = NewScope(*scope, EVAL_SCOPE);
}
} else if (info->is_global()) {
@@ -946,7 +947,7 @@ FunctionLiteral* Parser::DoParseProgram(CompilationInfo* info, Scope** scope,
FunctionState function_state(&function_state_, &scope_, *scope,
&function_factory);
- scope_->SetStrictMode(info->strict_mode());
+ scope_->SetLanguageMode(info->language_mode());
ZoneList<Statement*>* body = new(zone()) ZoneList<Statement*>(16, zone());
bool ok = true;
int beg_pos = scanner()->location().beg_pos;
@@ -962,11 +963,11 @@ FunctionLiteral* Parser::DoParseProgram(CompilationInfo* info, Scope** scope,
ParseStatementList(body, Token::EOS, info->is_eval(), eval_scope, &ok);
}
- if (ok && strict_mode() == STRICT) {
+ if (ok && is_strict(language_mode())) {
CheckStrictOctalLiteral(beg_pos, scanner()->location().end_pos, &ok);
}
- if (ok && allow_harmony_scoping() && strict_mode() == STRICT) {
+ if (ok && allow_harmony_scoping() && is_strict(language_mode())) {
CheckConflictingVarDeclarations(scope_, &ok);
}
@@ -1065,9 +1066,10 @@ FunctionLiteral* Parser::ParseLazy(Utf16CharacterStream* source) {
AstNodeFactory function_factory(ast_value_factory());
FunctionState function_state(&function_state_, &scope_, scope,
&function_factory);
- DCHECK(scope->strict_mode() == SLOPPY || info()->strict_mode() == STRICT);
- DCHECK(info()->strict_mode() == shared_info->strict_mode());
- scope->SetStrictMode(shared_info->strict_mode());
+ DCHECK(is_sloppy(scope->language_mode()) ||
+ is_strict(info()->language_mode()));
+ DCHECK(info()->language_mode() == shared_info->language_mode());
+ scope->SetLanguageMode(shared_info->language_mode());
FunctionLiteral::FunctionType function_type = shared_info->is_expression()
? (shared_info->is_anonymous()
? FunctionLiteral::ANONYMOUS_EXPRESSION
@@ -1145,7 +1147,7 @@ void* Parser::ParseStatementList(ZoneList<Statement*>* body, int end_token,
literal->raw_value()->IsString()) {
// Check "use strict" directive (ES5 14.1) and "use asm" directive. Only
// one can be present.
- if (strict_mode() == SLOPPY &&
+ if (is_sloppy(language_mode()) &&
literal->raw_value()->AsString() ==
ast_value_factory()->use_strict_string() &&
token_loc.end_pos - token_loc.beg_pos ==
@@ -1167,7 +1169,8 @@ void* Parser::ParseStatementList(ZoneList<Statement*>* body, int end_token,
}
mode_ = PARSE_EAGERLY;
}
- scope_->SetStrictMode(STRICT);
+ scope_->SetLanguageMode(
+ static_cast<LanguageMode>(scope_->language_mode() | STRICT));
// "use strict" is the only directive for now.
directive_prologue = false;
} else if (literal->raw_value()->AsString() ==
@@ -1208,7 +1211,7 @@ Statement* Parser::ParseStatementListItem(bool* ok) {
return ParseVariableStatement(kStatementListItem, NULL, ok);
case Token::LET:
DCHECK(allow_harmony_scoping());
- if (strict_mode() == STRICT) {
+ if (is_strict(language_mode())) {
return ParseVariableStatement(kStatementListItem, NULL, ok);
}
// Fall through.
@@ -1253,7 +1256,8 @@ Module* Parser::ParseModule(bool* ok) {
Scope* scope = NewScope(scope_, MODULE_SCOPE);
scope->set_start_position(scanner()->location().beg_pos);
- scope->SetStrictMode(STRICT);
+ scope->SetLanguageMode(
+ static_cast<LanguageMode>(scope->language_mode() | STRICT));
{
BlockState block_state(&scope_, scope);
@@ -1734,7 +1738,7 @@ Statement* Parser::ParseStatement(ZoneList<const AstRawString*>* labels,
// In Harmony mode, this case also handles the extension:
// Statement:
// GeneratorDeclaration
- if (strict_mode() == STRICT) {
+ if (is_strict(language_mode())) {
ReportMessageAt(scanner()->peek_location(), "strict_function");
*ok = false;
return NULL;
@@ -1752,7 +1756,7 @@ Statement* Parser::ParseStatement(ZoneList<const AstRawString*>* labels,
// In ES6 CONST is not allowed as a Statement, only as a
// LexicalDeclaration, however we continue to allow it in sloppy mode for
// backwards compatibility.
- if (strict_mode() == SLOPPY) {
+ if (is_sloppy(language_mode())) {
return ParseVariableStatement(kStatement, NULL, ok);
}
@@ -1820,7 +1824,7 @@ void Parser::Declare(Declaration* declaration, bool resolve, bool* ok) {
// because the var declaration is hoisted to the function scope where 'x'
// is already bound.
DCHECK(IsDeclaredVariableMode(var->mode()));
- if (allow_harmony_scoping() && strict_mode() == STRICT) {
+ if (allow_harmony_scoping() && is_strict(language_mode())) {
// In harmony we treat re-declarations as early errors. See
// ES5 16 for a definition of early errors.
ParserTraits::ReportMessage("var_redeclaration", name);
@@ -1861,7 +1865,7 @@ void Parser::Declare(Declaration* declaration, bool resolve, bool* ok) {
Variable(declaration_scope, name, mode, true, kind,
kNeedsInitialization, kNotAssigned, proxy->interface());
} else if (declaration_scope->is_eval_scope() &&
- declaration_scope->strict_mode() == SLOPPY) {
+ is_sloppy(declaration_scope->language_mode())) {
// For variable declarations in a sloppy eval scope the proxy is bound
// to a lookup variable to force a dynamic declaration using the
// DeclareLookupSlot runtime function.
@@ -1995,9 +1999,11 @@ Statement* Parser::ParseFunctionDeclaration(
// In ES6, a function behaves as a lexical binding, except in
// a script scope, or the initial scope of eval or another function.
VariableMode mode =
- allow_harmony_scoping() && strict_mode() == STRICT &&
- !(scope_->is_script_scope() || scope_->is_eval_scope() ||
- scope_->is_function_scope()) ? LET : VAR;
+ allow_harmony_scoping() && is_strict(language_mode()) &&
+ !(scope_->is_script_scope() || scope_->is_eval_scope() ||
+ scope_->is_function_scope())
+ ? LET
+ : VAR;
VariableProxy* proxy = NewUnresolved(name, mode, Interface::NewValue());
Declaration* declaration =
factory()->NewFunctionDeclaration(proxy, mode, fun, scope_, pos);
@@ -2023,7 +2029,7 @@ Statement* Parser::ParseClassDeclaration(ZoneList<const AstRawString*>* names,
// so rewrite it as such.
Expect(Token::CLASS, CHECK_OK);
- if (!allow_harmony_sloppy() && strict_mode() == SLOPPY) {
+ if (!allow_harmony_sloppy() && is_sloppy(language_mode())) {
ReportMessage("sloppy_lexical");
*ok = false;
return NULL;
@@ -2052,7 +2058,7 @@ Statement* Parser::ParseClassDeclaration(ZoneList<const AstRawString*>* names,
Block* Parser::ParseBlock(ZoneList<const AstRawString*>* labels, bool* ok) {
- if (allow_harmony_scoping() && strict_mode() == STRICT) {
+ if (allow_harmony_scoping() && is_strict(language_mode())) {
return ParseScopedBlock(labels, ok);
}
@@ -2163,25 +2169,23 @@ Block* Parser::ParseVariableDeclarations(
Consume(Token::VAR);
} else if (peek() == Token::CONST) {
Consume(Token::CONST);
- switch (strict_mode()) {
- case SLOPPY:
- mode = CONST_LEGACY;
- init_op = Token::INIT_CONST_LEGACY;
- break;
- case STRICT:
- DCHECK(var_context != kStatement);
- // In ES5 const is not allowed in strict mode.
- if (!allow_harmony_scoping()) {
- ReportMessage("strict_const");
- *ok = false;
- return NULL;
- }
- mode = CONST;
- init_op = Token::INIT_CONST;
+ if (is_sloppy(language_mode())) {
+ mode = CONST_LEGACY;
+ init_op = Token::INIT_CONST_LEGACY;
+ } else {
+ DCHECK(var_context != kStatement);
+ // In ES5 const is not allowed in strict mode.
+ if (!allow_harmony_scoping()) {
+ ReportMessage("strict_const");
+ *ok = false;
+ return NULL;
+ }
+ mode = CONST;
+ init_op = Token::INIT_CONST;
}
is_const = true;
needs_init = true;
- } else if (peek() == Token::LET && strict_mode() == STRICT) {
+ } else if (peek() == Token::LET && is_strict(language_mode())) {
DCHECK(allow_harmony_scoping());
Consume(Token::LET);
DCHECK(var_context != kStatement);
@@ -2352,10 +2356,10 @@ Block* Parser::ParseVariableDeclarations(
Runtime::FunctionForId(Runtime::kInitializeConstGlobal), arguments,
pos);
} else {
- // Add strict mode.
+ // Add language mode.
// We may want to pass singleton to avoid Literal allocations.
- StrictMode strict_mode = initialization_scope->strict_mode();
- arguments->Add(factory()->NewNumberLiteral(strict_mode, pos), zone());
+ LanguageMode language_mode = initialization_scope->language_mode();
+ arguments->Add(factory()->NewNumberLiteral(language_mode, pos), zone());
// Be careful not to assign a value to the global variable if
// we're in a with. The initialization value should not
@@ -2664,7 +2668,7 @@ Statement* Parser::ParseWithStatement(ZoneList<const AstRawString*>* labels,
Expect(Token::WITH, CHECK_OK);
int pos = position();
- if (strict_mode() == STRICT) {
+ if (is_strict(language_mode())) {
ReportMessage("strict_mode_with");
*ok = false;
return NULL;
@@ -3234,7 +3238,7 @@ Statement* Parser::ParseForStatement(ZoneList<const AstRawString*>* labels,
bool is_let_identifier_expression = false;
if (peek() != Token::SEMICOLON) {
if (peek() == Token::VAR ||
- (peek() == Token::CONST && strict_mode() == SLOPPY)) {
+ (peek() == Token::CONST && is_sloppy(language_mode()))) {
bool is_const = peek() == Token::CONST;
const AstRawString* name = NULL;
VariableDeclarationProperties decl_props = kHasNoInitializers;
@@ -3273,7 +3277,7 @@ Statement* Parser::ParseForStatement(ZoneList<const AstRawString*>* labels,
init = variable_statement;
}
} else if ((peek() == Token::LET || peek() == Token::CONST) &&
- strict_mode() == STRICT) {
+ is_strict(language_mode())) {
bool is_const = peek() == Token::CONST;
const AstRawString* name = NULL;
VariableDeclarationProperties decl_props = kHasNoInitializers;
@@ -3380,7 +3384,7 @@ Statement* Parser::ParseForStatement(ZoneList<const AstRawString*>* labels,
// Parsed initializer at this point.
// Detect attempts at 'let' declarations in sloppy mode.
- if (peek() == Token::IDENTIFIER && strict_mode() == SLOPPY &&
+ if (peek() == Token::IDENTIFIER && is_sloppy(language_mode()) &&
is_let_identifier_expression) {
ReportMessage("sloppy_lexical", NULL);
*ok = false;
@@ -3635,7 +3639,7 @@ FunctionLiteral* Parser::ParseFunctionLiteral(
Scope* original_declaration_scope = original_scope_->DeclarationScope();
Scope* scope =
function_type == FunctionLiteral::DECLARATION &&
- (!allow_harmony_scoping() || strict_mode() == SLOPPY) &&
+ (!allow_harmony_scoping() || is_sloppy(language_mode())) &&
(original_scope_ == original_declaration_scope ||
declaration_scope != original_declaration_scope)
? NewScope(declaration_scope, FUNCTION_SCOPE, kind)
@@ -3709,7 +3713,7 @@ FunctionLiteral* Parser::ParseFunctionLiteral(
}
Variable* var = scope_->DeclareParameter(param_name, VAR, is_rest);
- if (scope->strict_mode() == SLOPPY) {
+ if (is_sloppy(scope->language_mode())) {
// TODO(sigurds) Mark every parameter as maybe assigned. This is a
// conservative approximation necessary to account for parameters
// that are assigned via the arguments array.
@@ -3746,12 +3750,12 @@ FunctionLiteral* Parser::ParseFunctionLiteral(
Variable* fvar = NULL;
Token::Value fvar_init_op = Token::INIT_CONST_LEGACY;
if (function_type == FunctionLiteral::NAMED_EXPRESSION) {
- if (allow_harmony_scoping() && strict_mode() == STRICT) {
+ if (allow_harmony_scoping() && is_strict(language_mode())) {
fvar_init_op = Token::INIT_CONST;
}
VariableMode fvar_mode =
- allow_harmony_scoping() && strict_mode() == STRICT
- ? CONST : CONST_LEGACY;
+ allow_harmony_scoping() && is_strict(language_mode()) ? CONST
+ : CONST_LEGACY;
DCHECK(function_name != NULL);
fvar = new (zone())
Variable(scope_, function_name, fvar_mode, true /* is valid LHS */,
@@ -3816,7 +3820,7 @@ FunctionLiteral* Parser::ParseFunctionLiteral(
// Concise methods use StrictFormalParameters.
// Functions for which IsSimpleParameterList() returns false use
// StrictFormalParameters.
- if (strict_mode() == STRICT || IsConciseMethod(kind) || is_rest) {
+ if (is_strict(language_mode()) || IsConciseMethod(kind) || is_rest) {
CheckStrictFunctionNameAndParameters(function_name,
name_is_strict_reserved,
function_name_location,
@@ -3825,11 +3829,11 @@ FunctionLiteral* Parser::ParseFunctionLiteral(
reserved_loc,
CHECK_OK);
}
- if (strict_mode() == STRICT) {
+ if (is_strict(language_mode())) {
CheckStrictOctalLiteral(scope->start_position(), scope->end_position(),
CHECK_OK);
}
- if (allow_harmony_scoping() && strict_mode() == STRICT) {
+ if (allow_harmony_scoping() && is_strict(language_mode())) {
CheckConflictingVarDeclarations(scope, CHECK_OK);
}
}
@@ -3872,7 +3876,7 @@ void Parser::SkipLazyFunctionBody(const AstRawString* function_name,
total_preparse_skipped_ += scope_->end_position() - function_block_pos;
*materialized_literal_count = entry.literal_count();
*expected_property_count = entry.property_count();
- scope_->SetStrictMode(entry.strict_mode());
+ scope_->SetLanguageMode(entry.language_mode());
return;
}
cached_parse_data_->Reject();
@@ -3903,13 +3907,13 @@ void Parser::SkipLazyFunctionBody(const AstRawString* function_name,
total_preparse_skipped_ += scope_->end_position() - function_block_pos;
*materialized_literal_count = logger.literals();
*expected_property_count = logger.properties();
- scope_->SetStrictMode(logger.strict_mode());
+ scope_->SetLanguageMode(logger.language_mode());
if (produce_cached_parse_data()) {
DCHECK(log_);
// Position right after terminal '}'.
int body_end = scanner()->location().end_pos;
log_->LogFunction(function_block_pos, body_end, *materialized_literal_count,
- *expected_property_count, scope_->strict_mode());
+ *expected_property_count, scope_->language_mode());
}
}
@@ -4004,10 +4008,8 @@ PreParser::PreParseResult Parser::ParseLazyFunctionBodyWithPreParser(
reusable_preparser_->set_allow_harmony_rest_params(
allow_harmony_rest_params());
}
- PreParser::PreParseResult result =
- reusable_preparser_->PreParseLazyFunction(strict_mode(),
- is_generator(),
- logger);
+ PreParser::PreParseResult result = reusable_preparser_->PreParseLazyFunction(
+ language_mode(), is_generator(), logger);
if (pre_parse_timer_ != NULL) {
pre_parse_timer_->Stop();
}
@@ -4033,7 +4035,8 @@ ClassLiteral* Parser::ParseClassLiteral(const AstRawString* name,
Scope* block_scope = NewScope(scope_, BLOCK_SCOPE);
BlockState block_state(&scope_, block_scope);
- scope_->SetStrictMode(STRICT);
+ scope_->SetLanguageMode(
+ static_cast<LanguageMode>(scope_->language_mode() | STRICT));
scope_->SetScopeName(name);
VariableProxy* proxy = NULL;
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