1 files changed, 114 insertions, 0 deletions
diff --git a/js/src/jit/x64/SharedICHelpers-x64-inl.h b/js/src/jit/x64/SharedICHelpers-x64-inl.h
new file mode 100644
index 0000000000..dba4110dd2
--- /dev/null
+++ b/js/src/jit/x64/SharedICHelpers-x64-inl.h
@@ -0,0 +1,114 @@
+/* -*- 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/. */
+
+#ifndef jit_x64_SharedICHelpers_x64_inl_h
+#define jit_x64_SharedICHelpers_x64_inl_h
+
+#include "jit/BaselineFrame.h"
+#include "jit/SharedICHelpers.h"
+
+#include "jit/MacroAssembler-inl.h"
+
+namespace js {
+namespace jit {
+
+inline void EmitBaselineTailCallVM(TrampolinePtr target, MacroAssembler& masm,
+                                   uint32_t argSize) {
+  ScratchRegisterScope scratch(masm);
+
+  // We an assume during this that R0 and R1 have been pushed.
+  masm.movq(BaselineFrameReg, scratch);
+  masm.addq(Imm32(BaselineFrame::FramePointerOffset), scratch);
+  masm.subq(BaselineStackReg, scratch);
+
+#ifdef DEBUG
+  // Store frame size without VMFunction arguments for debug assertions.
+  masm.movq(scratch, rdx);
+  masm.subq(Imm32(argSize), rdx);
+  Address frameSizeAddr(BaselineFrameReg,
+                        BaselineFrame::reverseOffsetOfDebugFrameSize());
+  masm.store32(rdx, frameSizeAddr);
+#endif
+
+  // Push frame descriptor and perform the tail call.
+  masm.makeFrameDescriptor(scratch, FrameType::BaselineJS,
+                           ExitFrameLayout::Size());
+  masm.push(scratch);
+  masm.push(ICTailCallReg);
+  masm.jump(target);
+}
+
+inline void EmitBaselineCreateStubFrameDescriptor(MacroAssembler& masm,
+                                                  Register reg,
+                                                  uint32_t headerSize) {
+  // Compute stub frame size. We have to add two pointers: the stub reg and
+  // previous frame pointer pushed by EmitEnterStubFrame.
+  masm.movq(BaselineFrameReg, reg);
+  masm.addq(Imm32(sizeof(void*) * 2), reg);
+  masm.subq(BaselineStackReg, reg);
+
+  masm.makeFrameDescriptor(reg, FrameType::BaselineStub, headerSize);
+}
+
+inline void EmitBaselineCallVM(TrampolinePtr target, MacroAssembler& masm) {
+  ScratchRegisterScope scratch(masm);
+  EmitBaselineCreateStubFrameDescriptor(masm, scratch, ExitFrameLayout::Size());
+  masm.push(scratch);
+  masm.call(target);
+}
+
+// Size of values pushed by EmitBaselineEnterStubFrame.
+static const uint32_t STUB_FRAME_SIZE = 4 * sizeof(void*);
+static const uint32_t STUB_FRAME_SAVED_STUB_OFFSET = sizeof(void*);
+
+inline void EmitBaselineEnterStubFrame(MacroAssembler& masm, Register) {
+  ScratchRegisterScope scratch(masm);
+
+  // Compute frame size. Because the return address is still on the stack,
+  // this is:
+  //
+  //   BaselineFrameReg
+  //   + BaselineFrame::FramePointerOffset
+  //   - BaselineStackReg
+  //   - sizeof(return address)
+  //
+  // The two constants cancel each other out, so we can just calculate
+  // BaselineFrameReg - BaselineStackReg.
+
+  static_assert(
+      BaselineFrame::FramePointerOffset == sizeof(void*),
+      "FramePointerOffset must be the same as the return address size");
+
+  masm.movq(BaselineFrameReg, scratch);
+  masm.subq(BaselineStackReg, scratch);
+
+#ifdef DEBUG
+  Address frameSizeAddr(BaselineFrameReg,
+                        BaselineFrame::reverseOffsetOfDebugFrameSize());
+  masm.store32(scratch, frameSizeAddr);
+#endif
+
+  // Note: when making changes here,  don't forget to update STUB_FRAME_SIZE
+  // if needed.
+
+  // Push the return address that's currently on top of the stack.
+  masm.Push(Operand(BaselineStackReg, 0));
+
+  // Replace the original return address with the frame descriptor.
+  masm.makeFrameDescriptor(scratch, FrameType::BaselineJS,
+                           BaselineStubFrameLayout::Size());
+  masm.storePtr(scratch, Address(BaselineStackReg, sizeof(uintptr_t)));
+
+  // Save old frame pointer, stack pointer and stub reg.
+  masm.Push(ICStubReg);
+  masm.Push(BaselineFrameReg);
+  masm.mov(BaselineStackReg, BaselineFrameReg);
+}
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_x64_SharedICHelpers_x64_inl_h */