summaryrefslogtreecommitdiffstats
path: root/js/src/jit/RematerializedFrame.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'js/src/jit/RematerializedFrame.cpp')
-rw-r--r--js/src/jit/RematerializedFrame.cpp221
1 files changed, 221 insertions, 0 deletions
diff --git a/js/src/jit/RematerializedFrame.cpp b/js/src/jit/RematerializedFrame.cpp
new file mode 100644
index 0000000000..c9544057f7
--- /dev/null
+++ b/js/src/jit/RematerializedFrame.cpp
@@ -0,0 +1,221 @@
+/* -*- 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 "jit/RematerializedFrame.h"
+
+#include <algorithm>
+#include <utility>
+
+#include "jit/Bailouts.h"
+#include "jit/JSJitFrameIter.h"
+#include "js/friend/DumpFunctions.h" // js::DumpValue
+#include "vm/ArgumentsObject.h"
+
+#include "vm/EnvironmentObject-inl.h"
+#include "vm/JSScript-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()),
+ hasInitialEnv_(false),
+ isConstructing_(iter.isConstructing()),
+ hasCachedSavedFrame_(false),
+ top_(top),
+ pc_(iter.pc()),
+ frameNo_(iter.frameNo()),
+ numActualArgs_(numActualArgs),
+ script_(iter.script()),
+ envChain_(nullptr),
+ argsObj_(nullptr) {
+ if (iter.isFunctionFrame()) {
+ callee_ = iter.callee(fallback);
+ } else {
+ callee_ = nullptr;
+ }
+
+ CopyValueToRematerializedFrame op(slots_);
+ iter.readFrameArgsAndLocals(
+ cx, op, op, &envChain_, &hasInitialEnv_, &returnValue_, &argsObj_,
+ &thisArgument_, ReadFrameArgsBehavior::ActualsAndFormals, fallback);
+}
+
+/* static */
+RematerializedFrame* RematerializedFrame::New(JSContext* cx, uint8_t* top,
+ InlineFrameIterator& iter,
+ MaybeReadFallback& fallback) {
+ unsigned numFormals =
+ iter.isFunctionFrame() ? iter.calleeTemplate()->nargs() : 0;
+ unsigned argSlots = std::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;
+ }
+
+ RematerializedFrame* buf =
+ cx->pod_calloc_with_extra<RematerializedFrame, Value>(extraSlots);
+ 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, RematerializedFrameVector& frames) {
+ Rooted<RematerializedFrameVector> tempFrames(cx,
+ RematerializedFrameVector(cx));
+ if (!tempFrames.resize(iter.frameCount())) {
+ return false;
+ }
+
+ while (true) {
+ size_t frameNo = iter.frameNo();
+ tempFrames[frameNo].reset(
+ RematerializedFrame::New(cx, top, iter, fallback));
+ if (!tempFrames[frameNo]) {
+ return false;
+ }
+ if (tempFrames[frameNo]->environmentChain()) {
+ if (!EnsureHasEnvironmentObjects(cx, tempFrames[frameNo].get().get())) {
+ return false;
+ }
+ }
+
+ if (!iter.more()) {
+ break;
+ }
+ ++iter;
+ }
+
+ frames = std::move(tempFrames.get());
+ return true;
+}
+
+CallObject& RematerializedFrame::callObj() const {
+ MOZ_ASSERT(hasInitialEnvironment());
+ MOZ_ASSERT(callee()->needsCallObject());
+
+ 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,
+ Handle<Scope*> 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");
+ 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 %u offset %zu\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 %u): ", i);
+ } else {
+ fprintf(stderr, " overflown (arg %u): ", i);
+ }
+#ifdef DEBUG
+ DumpValue(argv()[i]);
+#else
+ fprintf(stderr, "?\n");
+#endif
+ }
+
+ for (unsigned i = 0; i < script()->nfixed(); i++) {
+ fprintf(stderr, " local %u: ", i);
+#ifdef DEBUG
+ DumpValue(locals()[i]);
+#else
+ fprintf(stderr, "?\n");
+#endif
+ }
+ }
+
+ fputc('\n', stderr);
+}