Fast-codegen: Implementing try/finally on top of nesting context.

src/x64/fast-codegen-x64.cc

 // Copyright 2009 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 1620 matching lines @@
 
 
 void FastCodeGenerator::VisitThisFunction(ThisFunction* expr) {
   __ movq(rax, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
   Move(expr->context(), rax);
 }
 
 
 Register FastCodeGenerator::result_register() { return rax; }
 
+// ----------------------------------------------------------------------------
+// Non-local control flow support.
+
+
+void FastCodeGenerator::EnterFinallyBlock() {
+  // Cook return address on top of stack (smi encoded Code* delta)
+  __ movq(rdx, Operand(rsp, 0));
+  __ Move(rcx, masm_->CodeObject());
+  __ subq(rdx, rcx);
+  __ Integer32ToSmi(rdx, rdx);
+  __ movq(Operand(rsp, 0), rdx);
+  // Store result register while executing finally block.
+  __ push(rax);
+}
+
+
+void FastCodeGenerator::ReturnFromFinallyBlock() {
+  // Restore result register from stack.
+  __ pop(rax);
+  // Uncook return address.
+  __ movq(rdx, Operand(rsp, 0));
+  __ SmiToInteger32(rdx, rdx);
+  __ Move(rcx, masm_->CodeObject());
+  __ addq(rdx, rcx);
+  __ movq(Operand(rsp, 0), rdx);
+  // And return.
+  __ ret(0);
+}
+
+
+void FastCodeGenerator::ThrowException() {
+  __ push(rax);
+  __ CallRuntime(Runtime::kThrow, 1);
+}
+
 #undef __
 
 
 } }  // namespace v8::internal