Extract hardcoded error strings into a single place and replace them with enum.

src/compiler.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 109 matching lines @@
     return;
   }
   mode_ = V8::UseCrankshaft() ? mode : NONOPT;
   if (script_->type()->value() == Script::TYPE_NATIVE) {
     MarkAsNative();
   }
   if (!shared_info_.is_null()) {
     ASSERT(language_mode() == CLASSIC_MODE);
     SetLanguageMode(shared_info_->language_mode());
   }
-  set_bailout_reason("unknown");
+  set_bailout_reason(kUnknown);
 }
 
 
 CompilationInfo::~CompilationInfo() {
   delete deferred_handles_;
   delete no_frame_ranges_;
 #ifdef DEBUG
   // Check that no dependent maps have been added or added dependent maps have
   // been rolled back or committed.
   for (int i = 0; i < DependentCode::kGroupCount; i++) {
@@ skipping 194 matching lines @@
   if (AlwaysFullCompiler(isolate())) {
     info()->SetCode(code);
     return SetLastStatus(BAILED_OUT);
   }
 
   // Limit the number of times we re-compile a functions with
   // the optimizing compiler.
   const int kMaxOptCount =
       FLAG_deopt_every_n_times == 0 ? FLAG_max_opt_count : 1000;
   if (info()->opt_count() > kMaxOptCount) {
-    info()->set_bailout_reason("optimized too many times");
+    info()->set_bailout_reason(kOptimizedTooManyTimes);
     return AbortOptimization();
   }
 
   // Due to an encoding limit on LUnallocated operands in the Lithium
   // language, we cannot optimize functions with too many formal parameters
   // or perform on-stack replacement for function with too many
   // stack-allocated local variables.
   //
   // The encoding is as a signed value, with parameters and receiver using
   // the negative indices and locals the non-negative ones.
   const int parameter_limit = -LUnallocated::kMinFixedSlotIndex;
   Scope* scope = info()->scope();
   if ((scope->num_parameters() + 1) > parameter_limit) {
-    info()->set_bailout_reason("too many parameters");
+    info()->set_bailout_reason(kTooManyParameters);
     return AbortOptimization();
   }
 
   const int locals_limit = LUnallocated::kMaxFixedSlotIndex;
   if (!info()->osr_ast_id().IsNone() &&
       scope->num_parameters() + 1 + scope->num_stack_slots() > locals_limit) {
-    info()->set_bailout_reason("too many parameters/locals");
+    info()->set_bailout_reason(kTooManyParametersLocals);
     return AbortOptimization();
   }
 
   // Take --hydrogen-filter into account.
   if (!info()->closure()->PassesHydrogenFilter()) {
       info()->SetCode(code);
       return SetLastStatus(BAILED_OUT);
   }
 
   // Recompile the unoptimized version of the code if the current version
@@ skipping 74 matching lines @@
 
 
 OptimizingCompiler::Status OptimizingCompiler::OptimizeGraph() {
   DisallowHeapAllocation no_allocation;
   DisallowHandleAllocation no_handles;
   DisallowHandleDereference no_deref;
 
   ASSERT(last_status() == SUCCEEDED);
   Timer t(this, &time_taken_to_optimize_);
   ASSERT(graph_ != NULL);
-  SmartArrayPointer<char> bailout_reason;
+  BailoutReason bailout_reason = kNoReason;
   if (!graph_->Optimize(&bailout_reason)) {
-    if (!bailout_reason.is_empty()) graph_builder_->Bailout(*bailout_reason);
+    if (bailout_reason != kNoReason) graph_builder_->Bailout(bailout_reason);
     return SetLastStatus(BAILED_OUT);
   } else {
     chunk_ = LChunk::NewChunk(graph_);
     if (chunk_ == NULL) {
       return SetLastStatus(BAILED_OUT);
     }
   }
   return SetLastStatus(SUCCEEDED);
 }
 
 
 OptimizingCompiler::Status OptimizingCompiler::GenerateAndInstallCode() {
   ASSERT(last_status() == SUCCEEDED);
   {  // Scope for timer.
     Timer timer(this, &time_taken_to_codegen_);
     ASSERT(chunk_ != NULL);
     ASSERT(graph_ != NULL);
     // Deferred handles reference objects that were accessible during
     // graph creation.  To make sure that we don't encounter inconsistencies
     // between graph creation and code generation, we disallow accessing
     // objects through deferred handles during the latter, with exceptions.
     DisallowDeferredHandleDereference no_deferred_handle_deref;
     Handle<Code> optimized_code = chunk_->Codegen();
     if (optimized_code.is_null()) {
-      info()->set_bailout_reason("code generation failed");
+      if (info()->bailout_reason() != kNoReason) {

[Jakob Kummerow, 2013/08/02 08:13:47]

Sorry, I mixed up the condition in my earlier comment. Obviously this should be
"==" -- only set the reason if it's not set yet.

+        info()->set_bailout_reason(kCodeGenerationFailed);
+      }
       return AbortOptimization();
     }
     info()->SetCode(optimized_code);
   }
   RecordOptimizationStats();
   return SetLastStatus(SUCCEEDED);
 }
 
 
 static bool GenerateCode(CompilationInfo* info) {
@@ skipping 274 matching lines @@
     CompilationInfoWithZone info(script);
     info.MarkAsEval();
     if (is_global) info.MarkAsGlobal();
     info.SetLanguageMode(language_mode);
     info.SetParseRestriction(restriction);
     info.SetContext(context);
     result = MakeFunctionInfo(&info);
     if (!result.is_null()) {
       // Explicitly disable optimization for eval code. We're not yet prepared
       // to handle eval-code in the optimizing compiler.
-      result->DisableOptimization("eval");
+      result->DisableOptimization(kEval);
 
       // If caller is strict mode, the result must be in strict mode or
       // extended mode as well, but not the other way around. Consider:
       // eval("'use strict'; ...");
       ASSERT(language_mode != STRICT_MODE || !result->is_classic_mode());
       // If caller is in extended mode, the result must also be in
       // extended mode.
       ASSERT(language_mode != EXTENDED_MODE ||
              result->is_extended_mode());
       if (!result->dont_cache()) {
@@ skipping 254 matching lines @@
   }
 
   Isolate* isolate = info->isolate();
   VMState<COMPILER> state(isolate);
   Logger::TimerEventScope timer(
       isolate, Logger::TimerEventScope::v8_recompile_synchronous);
   // If crankshaft succeeded, install the optimized code else install
   // the unoptimized code.
   OptimizingCompiler::Status status = optimizing_compiler->last_status();
   if (info->HasAbortedDueToDependencyChange()) {
-    info->set_bailout_reason("bailed out due to dependent map");
+    info->set_bailout_reason(kBailedOutDueToDependentMap);
     status = optimizing_compiler->AbortOptimization();
   } else if (status != OptimizingCompiler::SUCCEEDED) {
-    info->set_bailout_reason("failed/bailed out last time");
+    info->set_bailout_reason(kFailedBailedOutLastTime);
     status = optimizing_compiler->AbortOptimization();
   } else if (isolate->DebuggerHasBreakPoints()) {
-    info->set_bailout_reason("debugger is active");
+    info->set_bailout_reason(kDebuggerIsActive);
     status = optimizing_compiler->AbortOptimization();
   } else {
     status = optimizing_compiler->GenerateAndInstallCode();
     ASSERT(status == OptimizingCompiler::SUCCEEDED ||
            status == OptimizingCompiler::BAILED_OUT);
   }
 
   InstallCodeCommon(*info);
   if (status == OptimizingCompiler::SUCCEEDED) {
     Handle<Code> code = info->code();
@@ skipping 176 matching lines @@
   // Trace if the appropriate trace flag is set and the phase name's first
   // character is in the FLAG_trace_phase command line parameter.
   bool tracing_on = info()->IsStub() ?
       FLAG_trace_hydrogen_stubs :
       FLAG_trace_hydrogen;
   return (tracing_on &&
       OS::StrChr(const_cast<char*>(FLAG_trace_phase), name_[0]) != NULL);
 }
 
 } }  // namespace v8::internal