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diff --git a/js/src/jit/x86/SharedICHelpers-x86-inl.h b/js/src/jit/x86/SharedICHelpers-x86-inl.h
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+++ b/js/src/jit/x86/SharedICHelpers-x86-inl.h
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+/* -*- 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_x86_SharedICHelpers_x86_inl_h
+#define jit_x86_SharedICHelpers_x86_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) {
+#ifdef DEBUG
+ // We assume during this that R0 and R1 have been pushed.
+ // Store frame size without VMFunction arguments for debug assertions.
+ masm.movl(FramePointer, eax);
+ masm.subl(StackPointer, eax);
+ masm.subl(Imm32(argSize), eax);
+ Address frameSizeAddr(FramePointer,
+ BaselineFrame::reverseOffsetOfDebugFrameSize());
+ masm.store32(eax, frameSizeAddr);
+#endif
+
+ // Push frame descriptor and perform the tail call.
+ masm.pushFrameDescriptor(FrameType::BaselineJS);
+ masm.push(ICTailCallReg);
+ masm.jump(target);
+}
+
+inline void EmitBaselineCallVM(TrampolinePtr target, MacroAssembler& masm) {
+ masm.pushFrameDescriptor(FrameType::BaselineStub);
+ masm.call(target);
+}
+
+inline void EmitBaselineEnterStubFrame(MacroAssembler& masm, Register scratch) {
+#ifdef DEBUG
+ // Compute frame size. Because the return address is still on the stack,
+ // this is:
+ //
+ // FramePointer
+ // - StackPointer
+ // - sizeof(return address)
+
+ masm.movl(FramePointer, scratch);
+ masm.subl(StackPointer, scratch);
+ masm.subl(Imm32(sizeof(void*)), scratch); // Return address.
+
+ Address frameSizeAddr(FramePointer,
+ BaselineFrame::reverseOffsetOfDebugFrameSize());
+ masm.store32(scratch, frameSizeAddr);
+#endif
+
+ // Push the return address that's currently on top of the stack.
+ masm.Push(Operand(StackPointer, 0));
+
+ // Replace the original return address with the frame descriptor.
+ masm.storePtr(ImmWord(MakeFrameDescriptor(FrameType::BaselineJS)),
+ Address(StackPointer, sizeof(uintptr_t)));
+
+ // Save old frame pointer, stack pointer and stub reg.
+ masm.Push(FramePointer);
+ masm.mov(StackPointer, FramePointer);
+
+ masm.Push(ICStubReg);
+}
+
+} // namespace jit
+} // namespace js
+
+#endif /* jit_x86_SharedICHelpers_x86_inl_h */