Add support for deoptimization on x64. ...

src/x64/builtins-x64.cc

Index: src/x64/builtins-x64.cc
===================================================================
--- src/x64/builtins-x64.cc	(revision 6418)
+++ src/x64/builtins-x64.cc	(working copy)
@@ -561,7 +561,34 @@
 
 static void Generate_NotifyDeoptimizedHelper(MacroAssembler* masm,
                                              Deoptimizer::BailoutType type) {
-  __ int3();
+  // Enter an internal frame.
+  __ EnterInternalFrame();
+
+  // Pass the function and deoptimization type to the runtime system.

[Kevin Millikin (Chromium), 2011/01/24 13:52:21]

This comment isn't correct.  We grab the function from the stack.

[Rico, 2011/01/25 07:48:16]

Done.

+  __ Push(Smi::FromInt(static_cast<int>(type)));
+
+  __ CallRuntime(Runtime::kNotifyDeoptimized, 1);
+  // Tear down temporary frame.
+  __ LeaveInternalFrame();
+
+  // Get the full codegen state from the stack and untag it.
+  __ movq(rcx, Operand(rsp, 1 * kPointerSize));
+  __ SmiToInteger32(rcx, rcx);

[Lasse Reichstein, 2011/01/24 13:24:21]

You can use
 SmiToInteger32(rcx, Operand(rsp, 1 * kPointerSize);
It actually reads the 32-bit value directly from the upper bits of the stored
smi.

[Rico, 2011/01/24 13:40:14]

Done.

+
+  // Switch on the state.
+  NearLabel not_no_registers, not_tos_eax;

[Lasse Reichstein, 2011/01/24 13:24:21]

eax->rax

[Rico, 2011/01/24 13:40:14]

Done.

+  __ cmpq(rcx, Immediate(FullCodeGenerator::NO_REGISTERS));
+  __ j(not_equal, &not_no_registers);
+  __ ret(1 * kPointerSize);  // Remove state.
+
+  __ bind(&not_no_registers);
+  __ movq(rax, Operand(rsp, 2 * kPointerSize));
+  __ cmpq(rcx, Immediate(FullCodeGenerator::TOS_REG));
+  __ j(not_equal, &not_tos_eax);
+  __ ret(2 * kPointerSize);  // Remove state, eax.
+
+  __ bind(&not_tos_eax);
+  __ Abort("no cases left");
 }
 
 void Builtins::Generate_NotifyDeoptimized(MacroAssembler* masm) {