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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/JumpList.h"
#include "mozilla/Assertions.h" // MOZ_ASSERT
#include <stddef.h> // ptrdiff_t
#include "vm/BytecodeUtil.h" // GET_JUMP_OFFSET, SET_JUMP_OFFSET, IsJumpOpcode
using namespace js;
using namespace js::frontend;
void JumpList::push(jsbytecode* code, BytecodeOffset jumpOffset) {
if (!offset.valid()) {
SET_JUMP_OFFSET(&code[jumpOffset.value()], END_OF_LIST_DELTA);
} else {
SET_JUMP_OFFSET(&code[jumpOffset.value()], (offset - jumpOffset).value());
}
offset = jumpOffset;
}
void JumpList::patchAll(jsbytecode* code, JumpTarget target) {
if (!offset.valid()) {
// This list is not used. Nothing to do.
return;
}
BytecodeOffsetDiff delta;
BytecodeOffset jumpOffset = offset;
while (true) {
jsbytecode* pc = &code[jumpOffset.value()];
MOZ_ASSERT(IsJumpOpcode(JSOp(*pc)));
delta = BytecodeOffsetDiff(GET_JUMP_OFFSET(pc));
MOZ_ASSERT(delta.value() == END_OF_LIST_DELTA || delta.value() < 0);
BytecodeOffsetDiff span = target.offset - jumpOffset;
SET_JUMP_OFFSET(pc, span.value());
if (delta.value() == END_OF_LIST_DELTA) {
break;
}
jumpOffset += delta;
}
}
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