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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/. */
#include "frontend/ExpressionStatementEmitter.h"
#include "frontend/BytecodeEmitter.h"
#include "vm/Opcodes.h"
using namespace js;
using namespace js::frontend;
using mozilla::Maybe;
ExpressionStatementEmitter::ExpressionStatementEmitter(BytecodeEmitter* bce,
ValueUsage valueUsage)
: bce_(bce), valueUsage_(valueUsage) {}
bool ExpressionStatementEmitter::prepareForExpr(
const Maybe<uint32_t>& beginPos) {
MOZ_ASSERT(state_ == State::Start);
if (beginPos) {
if (!bce_->updateSourceCoordNotes(*beginPos)) {
return false;
}
}
#ifdef DEBUG
depth_ = bce_->bytecodeSection().stackDepth();
state_ = State::Expr;
#endif
return true;
}
bool ExpressionStatementEmitter::emitEnd() {
MOZ_ASSERT(state_ == State::Expr);
MOZ_ASSERT(bce_->bytecodeSection().stackDepth() == depth_ + 1);
// [stack] VAL
JSOp op = valueUsage_ == ValueUsage::WantValue ? JSOp::SetRval : JSOp::Pop;
if (!bce_->emit1(op)) {
// [stack] # if WantValue
// [stack] VAL
// [stack] # otherwise
// [stack]
return false;
}
#ifdef DEBUG
state_ = State::End;
#endif
return true;
}
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