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();
+}