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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/DoWhileEmitter.h"
#include "frontend/BytecodeEmitter.h"
#include "frontend/SourceNotes.h"
#include "vm/Opcodes.h"
#include "vm/StencilEnums.h" // TryNoteKind
using namespace js;
using namespace js::frontend;
using mozilla::Maybe;
using mozilla::Nothing;
DoWhileEmitter::DoWhileEmitter(BytecodeEmitter* bce) : bce_(bce) {}
bool DoWhileEmitter::emitBody(const Maybe<uint32_t>& doPos,
const Maybe<uint32_t>& bodyPos) {
MOZ_ASSERT(state_ == State::Start);
// Ensure that the column of the 'do' is set properly.
if (doPos) {
if (!bce_->updateSourceCoordNotes(*doPos)) {
return false;
}
}
// We need a nop here to make it possible to set a breakpoint on `do`.
if (!bce_->emit1(JSOp::Nop)) {
return false;
}
loopInfo_.emplace(bce_, StatementKind::DoLoop);
if (!loopInfo_->emitLoopHead(bce_, bodyPos)) {
return false;
}
#ifdef DEBUG
state_ = State::Body;
#endif
return true;
}
bool DoWhileEmitter::emitCond() {
MOZ_ASSERT(state_ == State::Body);
if (!loopInfo_->emitContinueTarget(bce_)) {
return false;
}
#ifdef DEBUG
state_ = State::Cond;
#endif
return true;
}
bool DoWhileEmitter::emitEnd() {
MOZ_ASSERT(state_ == State::Cond);
if (!loopInfo_->emitLoopEnd(bce_, JSOp::IfNe, TryNoteKind::Loop)) {
return false;
}
loopInfo_.reset();
#ifdef DEBUG
state_ = State::End;
#endif
return true;
}
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