1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/jit/RematerializedFrame.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,165 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef jit_RematerializedFrame_h
1.11 +#define jit_RematerializedFrame_h
1.12 +
1.13 +#ifdef JS_ION
1.14 +
1.15 +#include "jsfun.h"
1.16 +
1.17 +#include "jit/JitFrameIterator.h"
1.18 +
1.19 +#include "vm/Stack.h"
1.20 +
1.21 +namespace js {
1.22 +namespace jit {
1.23 +
1.24 +//
1.25 +// An optimized frame that has been rematerialized with values read out of
1.26 +// Snapshots.
1.27 +//
1.28 +class RematerializedFrame
1.29 +{
1.30 + // See DebugScopes::updateLiveScopes.
1.31 + bool prevUpToDate_;
1.32 +
1.33 + // The fp of the top frame associated with this possibly inlined frame.
1.34 + uint8_t *top_;
1.35 +
1.36 + size_t frameNo_;
1.37 + unsigned numActualArgs_;
1.38 +
1.39 + JSScript *script_;
1.40 + JSObject *scopeChain_;
1.41 + ArgumentsObject *argsObj_;
1.42 +
1.43 + Value returnValue_;
1.44 + Value thisValue_;
1.45 + Value slots_[1];
1.46 +
1.47 + RematerializedFrame(JSContext *cx, uint8_t *top, InlineFrameIterator &iter);
1.48 +
1.49 + public:
1.50 + static RematerializedFrame *New(JSContext *cx, uint8_t *top, InlineFrameIterator &iter);
1.51 +
1.52 + bool prevUpToDate() const {
1.53 + return prevUpToDate_;
1.54 + }
1.55 + void setPrevUpToDate() {
1.56 + prevUpToDate_ = true;
1.57 + }
1.58 +
1.59 + uint8_t *top() const {
1.60 + return top_;
1.61 + }
1.62 + size_t frameNo() const {
1.63 + return frameNo_;
1.64 + }
1.65 + bool inlined() const {
1.66 + return frameNo_ > 0;
1.67 + }
1.68 +
1.69 + JSObject *scopeChain() const {
1.70 + return scopeChain_;
1.71 + }
1.72 + bool hasCallObj() const {
1.73 + return maybeFun() && fun()->isHeavyweight();
1.74 + }
1.75 + CallObject &callObj() const;
1.76 +
1.77 + bool hasArgsObj() const {
1.78 + return !!argsObj_;
1.79 + }
1.80 + ArgumentsObject &argsObj() const {
1.81 + MOZ_ASSERT(hasArgsObj());
1.82 + MOZ_ASSERT(script()->needsArgsObj());
1.83 + return *argsObj_;
1.84 + }
1.85 +
1.86 + bool isFunctionFrame() const {
1.87 + return !!script_->functionNonDelazifying();
1.88 + }
1.89 + bool isGlobalFrame() const {
1.90 + return !isFunctionFrame();
1.91 + }
1.92 + bool isNonEvalFunctionFrame() const {
1.93 + // Ion doesn't support eval frames.
1.94 + return isFunctionFrame();
1.95 + }
1.96 +
1.97 + JSScript *script() const {
1.98 + return script_;
1.99 + }
1.100 + JSFunction *fun() const {
1.101 + MOZ_ASSERT(isFunctionFrame());
1.102 + return script_->functionNonDelazifying();
1.103 + }
1.104 + JSFunction *maybeFun() const {
1.105 + return isFunctionFrame() ? fun() : nullptr;
1.106 + }
1.107 + JSFunction *callee() const {
1.108 + return fun();
1.109 + }
1.110 + Value calleev() const {
1.111 + return ObjectValue(*fun());
1.112 + }
1.113 + Value &thisValue() {
1.114 + return thisValue_;
1.115 + }
1.116 +
1.117 + unsigned numFormalArgs() const {
1.118 + return maybeFun() ? fun()->nargs() : 0;
1.119 + }
1.120 + unsigned numActualArgs() const {
1.121 + return numActualArgs_;
1.122 + }
1.123 +
1.124 + Value *argv() {
1.125 + return slots_;
1.126 + }
1.127 + Value *locals() {
1.128 + return slots_ + numActualArgs_;
1.129 + }
1.130 +
1.131 + Value &unaliasedVar(unsigned i, MaybeCheckAliasing checkAliasing = CHECK_ALIASING) {
1.132 + JS_ASSERT_IF(checkAliasing, !script()->varIsAliased(i));
1.133 + JS_ASSERT(i < script()->nfixed());
1.134 + return locals()[i];
1.135 + }
1.136 + Value &unaliasedLocal(unsigned i, MaybeCheckAliasing checkAliasing = CHECK_ALIASING) {
1.137 + JS_ASSERT(i < script()->nfixed());
1.138 +#ifdef DEBUG
1.139 + CheckLocalUnaliased(checkAliasing, script(), i);
1.140 +#endif
1.141 + return locals()[i];
1.142 + }
1.143 + Value &unaliasedFormal(unsigned i, MaybeCheckAliasing checkAliasing = CHECK_ALIASING) {
1.144 + JS_ASSERT(i < numFormalArgs());
1.145 + JS_ASSERT_IF(checkAliasing, !script()->argsObjAliasesFormals() &&
1.146 + !script()->formalIsAliased(i));
1.147 + return argv()[i];
1.148 + }
1.149 + Value &unaliasedActual(unsigned i, MaybeCheckAliasing checkAliasing = CHECK_ALIASING) {
1.150 + JS_ASSERT(i < numActualArgs());
1.151 + JS_ASSERT_IF(checkAliasing, !script()->argsObjAliasesFormals());
1.152 + JS_ASSERT_IF(checkAliasing && i < numFormalArgs(), !script()->formalIsAliased(i));
1.153 + return argv()[i];
1.154 + }
1.155 +
1.156 + Value returnValue() const {
1.157 + return returnValue_;
1.158 + }
1.159 +
1.160 + void mark(JSTracer *trc);
1.161 + void dump();
1.162 +};
1.163 +
1.164 +} // namespace jit
1.165 +} // namespace js
1.166 +
1.167 +#endif // JS_ION
1.168 +#endif // jit_RematerializedFrame_h
