Bug 1169214: IonMonkey - Part 2: Add the x86 shared stub helpers, r=jandem

js/src/jit/x86/SharedICHelpers-x86.h

@@ -95,7 +95,15 @@ EmitBaselineTailCallVM(JitCode* target, MacroAssembler& masm, uint32_t argSize)
 inline void
 EmitIonTailCallVM(JitCode* target, MacroAssembler& masm, uint32_t stackSize)
 {
-    MOZ_CRASH("Not implemented yet.");
+    masm.movl(Operand(esp, stackSize), eax);
+    masm.shrl(Imm32(FRAMESIZE_SHIFT), eax);
+    masm.addl(Imm32(stackSize + JitStubFrameLayout::Size() - sizeof(intptr_t)), eax);
+
+    masm.makeFrameDescriptor(eax, JitFrame_IonJS);
+    masm.push(eax);
+    masm.push(ICTailCallReg);
+
+    masm.jmp(target);
 }
 
 inline void
@@ -121,7 +129,16 @@ 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.
@@ -159,7 +176,11 @@ EmitBaselineEnterStubFrame(MacroAssembler& masm, Register scratch)
 inline void
 EmitIonEnterStubFrame(MacroAssembler& masm, Register scratch)
 {
-    MOZ_CRASH("Not implemented yet.");
+    MOZ_ASSERT(scratch != ICTailCallReg);
+
+    masm.pop(ICTailCallReg);
+    masm.push(ICTailCallReg);
+    masm.push(ICStubReg);
 }
 
 inline void
@@ -192,7 +213,8 @@ EmitBaselineLeaveStubFrame(MacroAssembler& masm, bool calledIntoIon = false)
 inline void
 EmitIonLeaveStubFrame(MacroAssembler& masm)
 {
-    MOZ_CRASH("Not implemented yet.");
+    masm.pop(ICStubReg);
+    masm.pop(ICTailCallReg);
 }
 
 inline void