summaryrefslogtreecommitdiffstats
path: root/js/src/jit/arm/Bailouts-arm.cpp
diff options
context:
space:
mode:
authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /js/src/jit/arm/Bailouts-arm.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
downloadUXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.gz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.lz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.xz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.zip
Add m-esr52 at 52.6.0
Diffstat (limited to 'js/src/jit/arm/Bailouts-arm.cpp')
-rw-r--r--js/src/jit/arm/Bailouts-arm.cpp119
1 files changed, 119 insertions, 0 deletions
diff --git a/js/src/jit/arm/Bailouts-arm.cpp b/js/src/jit/arm/Bailouts-arm.cpp
new file mode 100644
index 000000000..db7f69d58
--- /dev/null
+++ b/js/src/jit/arm/Bailouts-arm.cpp
@@ -0,0 +1,119 @@
+/* -*- 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 "jscntxt.h"
+#include "jscompartment.h"
+
+#include "jit/arm/Assembler-arm.h"
+#include "jit/Bailouts.h"
+#include "jit/JitCompartment.h"
+
+using namespace js;
+using namespace js::jit;
+
+namespace js {
+namespace jit {
+
+class BailoutStack
+{
+ uintptr_t frameClassId_;
+ // This is pushed in the bailout handler. Both entry points into the handler
+ // inserts their own value int lr, which is then placed onto the stack along
+ // with frameClassId_ above. This should be migrated to ip.
+ public:
+ union {
+ uintptr_t frameSize_;
+ uintptr_t tableOffset_;
+ };
+
+ protected: // Silence Clang warning about unused private fields.
+ RegisterDump::FPUArray fpregs_;
+ RegisterDump::GPRArray regs_;
+
+ uintptr_t snapshotOffset_;
+ uintptr_t padding_;
+
+ public:
+ FrameSizeClass frameClass() const {
+ return FrameSizeClass::FromClass(frameClassId_);
+ }
+ uintptr_t tableOffset() const {
+ MOZ_ASSERT(frameClass() != FrameSizeClass::None());
+ return tableOffset_;
+ }
+ uint32_t frameSize() const {
+ if (frameClass() == FrameSizeClass::None())
+ return frameSize_;
+ return frameClass().frameSize();
+ }
+ MachineState machine() {
+ return MachineState::FromBailout(regs_, fpregs_);
+ }
+ SnapshotOffset snapshotOffset() const {
+ MOZ_ASSERT(frameClass() == FrameSizeClass::None());
+ return snapshotOffset_;
+ }
+ uint8_t* parentStackPointer() const {
+ if (frameClass() == FrameSizeClass::None())
+ return (uint8_t*)this + sizeof(BailoutStack);
+ return (uint8_t*)this + offsetof(BailoutStack, snapshotOffset_);
+ }
+};
+
+// Make sure the compiler doesn't add extra padding.
+static_assert((sizeof(BailoutStack) % 8) == 0, "BailoutStack should be 8-byte aligned.");
+
+} // namespace jit
+} // namespace js
+
+BailoutFrameInfo::BailoutFrameInfo(const JitActivationIterator& activations,
+ BailoutStack* bailout)
+ : machine_(bailout->machine())
+{
+ uint8_t* sp = bailout->parentStackPointer();
+ framePointer_ = sp + bailout->frameSize();
+ topFrameSize_ = framePointer_ - sp;
+
+ JSScript* script = ScriptFromCalleeToken(((JitFrameLayout*) framePointer_)->calleeToken());
+ JitActivation* activation = activations.activation()->asJit();
+ topIonScript_ = script->ionScript();
+
+ attachOnJitActivation(activations);
+
+ if (bailout->frameClass() == FrameSizeClass::None()) {
+ snapshotOffset_ = bailout->snapshotOffset();
+ return;
+ }
+
+ // Compute the snapshot offset from the bailout ID.
+ JSRuntime* rt = activation->compartment()->runtimeFromMainThread();
+ JitCode* code = rt->jitRuntime()->getBailoutTable(bailout->frameClass());
+ uintptr_t tableOffset = bailout->tableOffset();
+ uintptr_t tableStart = reinterpret_cast<uintptr_t>(Assembler::BailoutTableStart(code->raw()));
+
+ MOZ_ASSERT(tableOffset >= tableStart &&
+ tableOffset < tableStart + code->instructionsSize());
+ MOZ_ASSERT((tableOffset - tableStart) % BAILOUT_TABLE_ENTRY_SIZE == 0);
+
+ uint32_t bailoutId = ((tableOffset - tableStart) / BAILOUT_TABLE_ENTRY_SIZE) - 1;
+ MOZ_ASSERT(bailoutId < BAILOUT_TABLE_SIZE);
+
+ snapshotOffset_ = topIonScript_->bailoutToSnapshot(bailoutId);
+}
+
+BailoutFrameInfo::BailoutFrameInfo(const JitActivationIterator& activations,
+ InvalidationBailoutStack* bailout)
+ : machine_(bailout->machine())
+{
+ framePointer_ = (uint8_t*) bailout->fp();
+ topFrameSize_ = framePointer_ - bailout->sp();
+ topIonScript_ = bailout->ionScript();
+ attachOnJitActivation(activations);
+
+ uint8_t* returnAddressToFp_ = bailout->osiPointReturnAddress();
+ const OsiIndex* osiIndex = topIonScript_->getOsiIndex(returnAddressToFp_);
+ snapshotOffset_ = osiIndex->snapshotOffset();
+}