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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef frontend_ParseContext_inl_h
#define frontend_ParseContext_inl_h
#include "frontend/ParseContext.h"
#include "mozilla/ResultVariant.h"
#include "frontend/Parser.h"
#include "vm/JSContext.h"
namespace js {
namespace frontend {
template <>
inline bool ParseContext::Statement::is<ParseContext::LabelStatement>() const {
return kind_ == StatementKind::Label;
}
template <>
inline bool ParseContext::Statement::is<ParseContext::ClassStatement>() const {
return kind_ == StatementKind::Class;
}
template <typename T>
inline T& ParseContext::Statement::as() {
MOZ_ASSERT(is<T>());
return static_cast<T&>(*this);
}
inline ParseContext::Scope::BindingIter ParseContext::Scope::bindings(
ParseContext* pc) {
// In function scopes with parameter expressions, function special names
// (like '.this') are declared as vars in the function scope, despite its
// not being the var scope.
return BindingIter(*this, pc->varScope_ == this ||
pc->functionScope_.ptrOr(nullptr) == this);
}
inline ParseContext::Scope::Scope(ParserBase* parser)
: Nestable<Scope>(&parser->pc_->innermostScope_),
declared_(parser->cx_->frontendCollectionPool()),
possibleAnnexBFunctionBoxes_(parser->cx_->frontendCollectionPool()),
id_(parser->usedNames_.nextScopeId()) {}
inline ParseContext::Scope::Scope(JSContext* cx, ParseContext* pc,
UsedNameTracker& usedNames)
: Nestable<Scope>(&pc->innermostScope_),
declared_(cx->frontendCollectionPool()),
possibleAnnexBFunctionBoxes_(cx->frontendCollectionPool()),
id_(usedNames.nextScopeId()) {}
inline ParseContext::VarScope::VarScope(ParserBase* parser) : Scope(parser) {
useAsVarScope(parser->pc_);
}
inline ParseContext::VarScope::VarScope(JSContext* cx, ParseContext* pc,
UsedNameTracker& usedNames)
: Scope(cx, pc, usedNames) {
useAsVarScope(pc);
}
inline JS::Result<Ok, ParseContext::BreakStatementError>
ParseContext::checkBreakStatement(const ParserName* label) {
// Labeled 'break' statements target the nearest labeled statements (could
// be any kind) with the same label. Unlabeled 'break' statements target
// the innermost loop or switch statement.
if (label) {
auto hasSameLabel = [&label](ParseContext::LabelStatement* stmt) {
MOZ_ASSERT(stmt);
return stmt->label() == label;
};
if (!findInnermostStatement<ParseContext::LabelStatement>(hasSameLabel)) {
return mozilla::Err(ParseContext::BreakStatementError::LabelNotFound);
}
} else {
auto isBreakTarget = [](ParseContext::Statement* stmt) {
return StatementKindIsUnlabeledBreakTarget(stmt->kind());
};
if (!findInnermostStatement(isBreakTarget)) {
return mozilla::Err(ParseContext::BreakStatementError::ToughBreak);
}
}
return Ok();
}
inline JS::Result<Ok, ParseContext::ContinueStatementError>
ParseContext::checkContinueStatement(const ParserName* label) {
// Labeled 'continue' statements target the nearest labeled loop
// statements with the same label. Unlabeled 'continue' statements target
// the innermost loop statement.
auto isLoop = [](ParseContext::Statement* stmt) {
MOZ_ASSERT(stmt);
return StatementKindIsLoop(stmt->kind());
};
if (!label) {
// Unlabeled statement: we target the innermost loop, so make sure that
// there is an innermost loop.
if (!findInnermostStatement(isLoop)) {
return mozilla::Err(ParseContext::ContinueStatementError::NotInALoop);
}
return Ok();
}
// Labeled statement: targest the nearest labeled loop with the same label.
ParseContext::Statement* stmt = innermostStatement();
bool foundLoop = false; // True if we have encountered at least one loop.
for (;;) {
stmt = ParseContext::Statement::findNearest(stmt, isLoop);
if (!stmt) {
return foundLoop
? mozilla::Err(
ParseContext::ContinueStatementError::LabelNotFound)
: mozilla::Err(
ParseContext::ContinueStatementError::NotInALoop);
}
foundLoop = true;
// Is it labeled by our label?
stmt = stmt->enclosing();
while (stmt && stmt->is<ParseContext::LabelStatement>()) {
if (stmt->as<ParseContext::LabelStatement>().label() == label) {
return Ok();
}
stmt = stmt->enclosing();
}
}
}
template <typename DeclaredNamePtrT>
inline void RedeclareVar(DeclaredNamePtrT ptr, DeclarationKind kind) {
#ifdef DEBUG
DeclarationKind declaredKind = ptr->value()->kind();
MOZ_ASSERT(DeclarationKindIsVar(declaredKind));
#endif
// Any vars that are redeclared as body-level functions must
// be recorded as body-level functions.
//
// In the case of global and eval scripts, GlobalDeclaration-
// Instantiation [1] and EvalDeclarationInstantiation [2]
// check for the declarability of global var and function
// bindings via CanDeclareVar [3] and CanDeclareGlobal-
// Function [4]. CanDeclareGlobalFunction is strictly more
// restrictive than CanDeclareGlobalVar, so record the more
// restrictive kind. These semantics are implemented in
// CheckCanDeclareGlobalBinding.
//
// VarForAnnexBLexicalFunction declarations are declared when
// the var scope exits. It is not possible for a var to be
// previously declared as VarForAnnexBLexicalFunction and
// checked for redeclaration.
//
// [1] ES 15.1.11
// [2] ES 18.2.1.3
// [3] ES 8.1.1.4.15
// [4] ES 8.1.1.4.16
if (kind == DeclarationKind::BodyLevelFunction) {
MOZ_ASSERT(declaredKind != DeclarationKind::VarForAnnexBLexicalFunction);
ptr->value()->alterKind(kind);
}
}
} // namespace frontend
} // namespace js
#endif // frontend_ParseContext_inl_h
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