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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* 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 "jit/RematerializedFrame.h"
#include "mozilla/SizePrintfMacros.h"
#include "jit/JitFrames.h"
#include "vm/ArgumentsObject.h"
#include "vm/Debugger.h"
#include "jsscriptinlines.h"
#include "jit/JitFrames-inl.h"
#include "vm/EnvironmentObject-inl.h"
using namespace js;
using namespace jit;
struct CopyValueToRematerializedFrame
{
Value* slots;
explicit CopyValueToRematerializedFrame(Value* slots)
: slots(slots)
{ }
void operator()(const Value& v) {
*slots++ = v;
}
};
RematerializedFrame::RematerializedFrame(JSContext* cx, uint8_t* top, unsigned numActualArgs,
InlineFrameIterator& iter, MaybeReadFallback& fallback)
: prevUpToDate_(false),
isDebuggee_(iter.script()->isDebuggee()),
isConstructing_(iter.isConstructing()),
hasCachedSavedFrame_(false),
top_(top),
pc_(iter.pc()),
frameNo_(iter.frameNo()),
numActualArgs_(numActualArgs),
script_(iter.script())
{
if (iter.isFunctionFrame())
callee_ = iter.callee(fallback);
else
callee_ = nullptr;
CopyValueToRematerializedFrame op(slots_);
iter.readFrameArgsAndLocals(cx, op, op, &envChain_, &hasInitialEnv_, &returnValue_,
&argsObj_, &thisArgument_, &newTarget_, ReadFrame_Actuals,
fallback);
}
/* static */ RematerializedFrame*
RematerializedFrame::New(JSContext* cx, uint8_t* top, InlineFrameIterator& iter,
MaybeReadFallback& fallback)
{
unsigned numFormals = iter.isFunctionFrame() ? iter.calleeTemplate()->nargs() : 0;
unsigned argSlots = Max(numFormals, iter.numActualArgs());
unsigned extraSlots = argSlots + iter.script()->nfixed();
// One Value slot is included in sizeof(RematerializedFrame), so we can
// reduce the extra slot count by one. However, if there are zero slot
// allocations total, then reducing the slots by one will lead to
// the memory allocation being smaller than sizeof(RematerializedFrame).
if (extraSlots > 0)
extraSlots -= 1;
size_t numBytes = sizeof(RematerializedFrame) + (extraSlots * sizeof(Value));
MOZ_ASSERT(numBytes >= sizeof(RematerializedFrame));
void* buf = cx->pod_calloc<uint8_t>(numBytes);
if (!buf)
return nullptr;
return new (buf) RematerializedFrame(cx, top, iter.numActualArgs(), iter, fallback);
}
/* static */ bool
RematerializedFrame::RematerializeInlineFrames(JSContext* cx, uint8_t* top,
InlineFrameIterator& iter,
MaybeReadFallback& fallback,
GCVector<RematerializedFrame*>& frames)
{
Rooted<GCVector<RematerializedFrame*>> tempFrames(cx, GCVector<RematerializedFrame*>(cx));
if (!tempFrames.resize(iter.frameCount()))
return false;
while (true) {
size_t frameNo = iter.frameNo();
tempFrames[frameNo].set(RematerializedFrame::New(cx, top, iter, fallback));
if (!tempFrames[frameNo])
return false;
if (tempFrames[frameNo]->environmentChain()) {
if (!EnsureHasEnvironmentObjects(cx, tempFrames[frameNo].get()))
return false;
}
if (!iter.more())
break;
++iter;
}
frames = Move(tempFrames.get());
return true;
}
/* static */ void
RematerializedFrame::FreeInVector(GCVector<RematerializedFrame*>& frames)
{
for (size_t i = 0; i < frames.length(); i++) {
RematerializedFrame* f = frames[i];
MOZ_ASSERT(!Debugger::inFrameMaps(f));
f->RematerializedFrame::~RematerializedFrame();
js_free(f);
}
frames.clear();
}
CallObject&
RematerializedFrame::callObj() const
{
MOZ_ASSERT(hasInitialEnvironment());
JSObject* env = environmentChain();
while (!env->is<CallObject>())
env = env->enclosingEnvironment();
return env->as<CallObject>();
}
bool
RematerializedFrame::initFunctionEnvironmentObjects(JSContext* cx)
{
return js::InitFunctionEnvironmentObjects(cx, this);
}
bool
RematerializedFrame::pushVarEnvironment(JSContext* cx, HandleScope scope)
{
return js::PushVarEnvironmentObject(cx, scope, this);
}
void
RematerializedFrame::trace(JSTracer* trc)
{
TraceRoot(trc, &script_, "remat ion frame script");
TraceRoot(trc, &envChain_, "remat ion frame env chain");
if (callee_)
TraceRoot(trc, &callee_, "remat ion frame callee");
if (argsObj_)
TraceRoot(trc, &argsObj_, "remat ion frame argsobj");
TraceRoot(trc, &returnValue_, "remat ion frame return value");
TraceRoot(trc, &thisArgument_, "remat ion frame this");
TraceRoot(trc, &newTarget_, "remat ion frame newTarget");
TraceRootRange(trc, numArgSlots() + script_->nfixed(), slots_, "remat ion frame stack");
}
void
RematerializedFrame::dump()
{
fprintf(stderr, " Rematerialized Ion Frame%s\n", inlined() ? " (inlined)" : "");
if (isFunctionFrame()) {
fprintf(stderr, " callee fun: ");
#ifdef DEBUG
DumpValue(ObjectValue(*callee()));
#else
fprintf(stderr, "?\n");
#endif
} else {
fprintf(stderr, " global frame, no callee\n");
}
fprintf(stderr, " file %s line %" PRIuSIZE " offset %" PRIuSIZE "\n",
script()->filename(), script()->lineno(),
script()->pcToOffset(pc()));
fprintf(stderr, " script = %p\n", (void*) script());
if (isFunctionFrame()) {
fprintf(stderr, " env chain: ");
#ifdef DEBUG
DumpValue(ObjectValue(*environmentChain()));
#else
fprintf(stderr, "?\n");
#endif
if (hasArgsObj()) {
fprintf(stderr, " args obj: ");
#ifdef DEBUG
DumpValue(ObjectValue(argsObj()));
#else
fprintf(stderr, "?\n");
#endif
}
fprintf(stderr, " this: ");
#ifdef DEBUG
DumpValue(thisArgument());
#else
fprintf(stderr, "?\n");
#endif
for (unsigned i = 0; i < numActualArgs(); i++) {
if (i < numFormalArgs())
fprintf(stderr, " formal (arg %d): ", i);
else
fprintf(stderr, " overflown (arg %d): ", i);
#ifdef DEBUG
DumpValue(argv()[i]);
#else
fprintf(stderr, "?\n");
#endif
}
for (unsigned i = 0; i < script()->nfixed(); i++) {
fprintf(stderr, " local %d: ", i);
#ifdef DEBUG
DumpValue(locals()[i]);
#else
fprintf(stderr, "?\n");
#endif
}
}
fputc('\n', stderr);
}
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