Bug 1169214: IonMonkey - Part 3: Add the x64 shared stub helpers, r=jandem

js/src/jit/x64/SharedICHelpers-x64.h

@@ -92,7 +92,15 @@ EmitBaselineTailCallVM(JitCode* target, MacroAssembler& masm, uint32_t argSize)
 inline void
 EmitIonTailCallVM(JitCode* target, MacroAssembler& masm, uint32_t stackSize)
 {
-    MOZ_CRASH("Not implemented yet.");
+    masm.movq(Operand(esp, stackSize), ScratchReg);
+    masm.shrq(Imm32(FRAMESIZE_SHIFT), ScratchReg);
+    masm.addq(Imm32(stackSize + JitStubFrameLayout::Size() - sizeof(intptr_t)), ScratchReg);
+
+    // Push frame descriptor and perform the tail call.
+    masm.makeFrameDescriptor(ScratchReg, JitFrame_IonJS);
+    masm.push(ScratchReg);
+    masm.push(ICTailCallReg);
+    masm.jmp(target);
 }
 
 inline void
@@ -118,7 +126,16 @@ EmitBaselineCallVM(JitCode* target, MacroAssembler& masm)
 inline void
 EmitIonCallVM(JitCode* target, size_t stackSlots, MacroAssembler& masm)
 {
-    MOZ_CRASH("Not implemented yet.");
+    uint32_t descriptor = MakeFrameDescriptor(masm.framePushed(), JitFrame_IonStub);
+    masm.Push(Imm32(descriptor));
+    masm.call(target);
+
+    // Remove rest of the frame left on the stack. We remove the return address
+    // which is implicitly poped when returning.
+    size_t framePop = sizeof(ExitFrameLayout) - sizeof(void*);
+
+    // Pop arguments from framePushed.
+    masm.implicitPop(stackSlots * sizeof(void*) + framePop);
 }
 
 // Size of vales pushed by EmitEnterStubFrame.
@@ -152,9 +169,11 @@ EmitBaselineEnterStubFrame(MacroAssembler& masm, Register)
 }
 
 inline void
-EmitIonEnterStubFrame(MacroAssembler& masm, Register scratch)
+EmitIonEnterStubFrame(MacroAssembler& masm, Register)
 {
-    MOZ_CRASH("Not implemented yet.");
+    masm.pop(ICTailCallReg);
+    masm.push(ICTailCallReg);
+    masm.push(ICStubReg);
 }
 
 inline void
@@ -186,7 +205,8 @@ EmitBaselineLeaveStubFrame(MacroAssembler& masm, bool calledIntoIon = false)
 inline void
 EmitIonLeaveStubFrame(MacroAssembler& masm)
 {
-    MOZ_CRASH("Not implemented yet.");
+    masm.pop(ICStubReg);
+    masm.pop(ICTailCallReg);
 }
 
 inline void