Refactor interrupt check patching for OSR.

src/ia32/deoptimizer-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 182 matching lines @@
 // The patched back edge looks like this:
 //
 //     sub <profiling_counter>, <delta>  ;; Not changed
 //     nop
 //     nop
 //     call <on-stack replacment>
 //   ok:
 
 void Deoptimizer::PatchInterruptCodeAt(Code* unoptimized_code,
                                        Address pc_after,
-                                       Code* interrupt_code,
                                        Code* replacement_code) {
-  ASSERT(!InterruptCodeIsPatched(unoptimized_code,
-                                 pc_after,
-                                 interrupt_code,
-                                 replacement_code));
   // Turn the jump into nops.
   Address call_target_address = pc_after - kIntSize;
   *(call_target_address - 3) = kNopByteOne;
   *(call_target_address - 2) = kNopByteTwo;
   // Replace the call address.
   Assembler::set_target_address_at(call_target_address,
                                    replacement_code->entry());
 
   unoptimized_code->GetHeap()->incremental_marking()->RecordCodeTargetPatch(
       unoptimized_code, call_target_address, replacement_code);
 }
 
 
 void Deoptimizer::RevertInterruptCodeAt(Code* unoptimized_code,
                                         Address pc_after,
-                                        Code* interrupt_code,
-                                        Code* replacement_code) {
-  ASSERT(InterruptCodeIsPatched(unoptimized_code,
-                                pc_after,
-                                interrupt_code,
-                                replacement_code));
+                                        Code* interrupt_code) {
   // Restore the original jump.
   Address call_target_address = pc_after - kIntSize;
   *(call_target_address - 3) = kJnsInstruction;
   *(call_target_address - 2) = kJnsOffset;
   // Restore the original call address.
   Assembler::set_target_address_at(call_target_address,
                                    interrupt_code->entry());
 
   interrupt_code->GetHeap()->incremental_marking()->RecordCodeTargetPatch(
       unoptimized_code, call_target_address, interrupt_code);
 }
 
 
 #ifdef DEBUG
-bool Deoptimizer::InterruptCodeIsPatched(Code* unoptimized_code,
-                                         Address pc_after,
-                                         Code* interrupt_code,
-                                         Code* replacement_code) {
+Deoptimizer::InterruptPatchState Deoptimizer::GetInterruptPatchState(
+    Isolate* isolate,
+    Code* unoptimized_code,
+    Address pc_after) {
   Address call_target_address = pc_after - kIntSize;
   ASSERT_EQ(kCallInstruction, *(call_target_address - 1));
   if (*(call_target_address - 3) == kNopByteOne) {
-    ASSERT_EQ(replacement_code->entry(),
-             Assembler::target_address_at(call_target_address));
     ASSERT_EQ(kNopByteTwo,      *(call_target_address - 2));
-    return true;
+    Code* osr_builtin =
+        isolate->builtins()->builtin(Builtins::kOnStackReplacement);
+    ASSERT_EQ(osr_builtin->entry(),
+              Assembler::target_address_at(call_target_address));
+    return PATCHED_FOR_OSR;
   } else {
+    // Get the interrupt stub code object to match against from cache.
+    Code* interrupt_code = NULL;
+    InterruptStub stub;
+    if (!stub.FindCodeInCache(&interrupt_code, isolate)) UNREACHABLE();
     ASSERT_EQ(interrupt_code->entry(),
               Assembler::target_address_at(call_target_address));
     ASSERT_EQ(kJnsInstruction,  *(call_target_address - 3));
     ASSERT_EQ(kJnsOffset,       *(call_target_address - 2));
-    return false;
+    return NOT_PATCHED;
   }
 }
 #endif  // DEBUG
 
 
 static int LookupBailoutId(DeoptimizationInputData* data, BailoutId ast_id) {
   ByteArray* translations = data->TranslationByteArray();
   int length = data->DeoptCount();
   for (int i = 0; i < length; i++) {
     if (data->AstId(i) == ast_id) {
@@ skipping 447 matching lines @@
   SetFrameSlot(offset, value);
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32