Partial ia32 implementation of optimized try/catch (by Kevin Millikin)

src/ia32/builtins-ia32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 524 matching lines @@
   // Do a tail-call of the compiled function.
   __ lea(eax, FieldOperand(eax, Code::kHeaderSize));
   __ jmp(eax);
 }
 
 
 static void Generate_NotifyDeoptimizedHelper(MacroAssembler* masm,
                                              Deoptimizer::BailoutType type) {
   {
     FrameScope scope(masm, StackFrame::INTERNAL);
-
+    // Registers set in the output frame that need to be preserved.
+    if (type == Deoptimizer::LAZY) {
+      __ push(eax);  // Exception when throwing to optimized code.
+    }
     // Pass deoptimization type to the runtime system.
     __ push(Immediate(Smi::FromInt(static_cast<int>(type))));
     __ CallRuntime(Runtime::kNotifyDeoptimized, 1);
 
+    if (type == Deoptimizer::LAZY) {
+      __ pop(eax);
+    }
     // Tear down internal frame.
   }
 
-  // Get the full codegen state from the stack and untag it.
-  __ mov(ecx, Operand(esp, 1 * kPointerSize));
-  __ SmiUntag(ecx);
-
   // Switch on the state.
-  Label not_no_registers, not_tos_eax;
-  __ cmp(ecx, FullCodeGenerator::NO_REGISTERS);
+  Label not_no_registers;
+  __ cmp(Operand(esp, 1 * kPointerSize),
+         Immediate(Smi::FromInt(FullCodeGenerator::NO_REGISTERS)));
   __ j(not_equal, &not_no_registers, Label::kNear);
   __ ret(1 * kPointerSize);  // Remove state.
 
   __ bind(&not_no_registers);
   __ mov(eax, Operand(esp, 2 * kPointerSize));
-  __ cmp(ecx, FullCodeGenerator::TOS_REG);
-  __ j(not_equal, &not_tos_eax, Label::kNear);
+  if (masm->emit_debug_code()) {
+    __ cmp(Operand(esp, 1 * kPointerSize),
+           Immediate(Smi::FromInt(FullCodeGenerator::TOS_REG)));
+    __ Assert(equal, "Invalid deoptimization state.");
+  }
   __ ret(2 * kPointerSize);  // Remove state, eax.
-
-  __ bind(&not_tos_eax);
-  __ Abort("no cases left");
 }
 
 
 void Builtins::Generate_NotifyDeoptimized(MacroAssembler* masm) {
   Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::EAGER);
 }
 
 
 void Builtins::Generate_NotifyLazyDeoptimized(MacroAssembler* masm) {
   Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::LAZY);
@@ skipping 1186 matching lines @@
   Deoptimizer::EntryGenerator generator(masm, Deoptimizer::OSR);
   generator.Generate();
 }
 
 
 #undef __
 }
 }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32