Remove experimental fast-codegen. We are no longer working on this

src/compiler.cc

 // Copyright 2010 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 15 matching lines @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "v8.h"
 
 #include "bootstrapper.h"
 #include "codegen-inl.h"
 #include "compilation-cache.h"
 #include "compiler.h"
 #include "data-flow.h"
 #include "debug.h"
-#include "fast-codegen.h"
 #include "flow-graph.h"
 #include "full-codegen.h"
 #include "liveedit.h"
 #include "oprofile-agent.h"
 #include "rewriter.h"
 #include "scopes.h"
 #include "scopeinfo.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 66 matching lines @@
     }
 #endif
   }
 
   // Generate code and return it.  Code generator selection is governed by
   // which backends are enabled and whether the function is considered
   // run-once code or not:
   //
   //  --full-compiler enables the dedicated backend for code we expect to be
   //    run once
-  //  --fast-compiler enables a speculative optimizing backend (for
-  //    non-run-once code)
   //
   // The normal choice of backend can be overridden with the flags
-  // --always-full-compiler and --always-fast-compiler, which are mutually
-  // incompatible.
-  CHECK(!FLAG_always_full_compiler || !FLAG_always_fast_compiler);
-
+  // --always-full-compiler.
   Handle<SharedFunctionInfo> shared = info->shared_info();
   bool is_run_once = (shared.is_null())
       ? info->scope()->is_global_scope()
       : (shared->is_toplevel() || shared->try_full_codegen());
 
   if (AlwaysFullCompiler()) {
     return FullCodeGenerator::MakeCode(info);
   } else if (FLAG_full_compiler && is_run_once) {
     FullCodeGenSyntaxChecker checker;
     checker.Check(function);
     if (checker.has_supported_syntax()) {
       return FullCodeGenerator::MakeCode(info);
     }
-  } else if (FLAG_always_fast_compiler ||
-             (FLAG_fast_compiler && !is_run_once)) {
-    FastCodeGenSyntaxChecker checker;
-    checker.Check(info);
-    if (checker.has_supported_syntax()) {
-      return FastCodeGenerator::MakeCode(info);
-    }
   }
 
   return CodeGenerator::MakeCode(info);
 }
 
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
 Handle<Code> MakeCodeForLiveEdit(CompilationInfo* info) {
   Handle<Context> context = Handle<Context>::null();
   Handle<Code> code = MakeCode(context, info);
@@ skipping 360 matching lines @@
         graph->PrintAsText(literal->name());
       }
 #endif
     }
 
     // Generate code and return it.  The way that the compilation mode
     // is controlled by the command-line flags is described in
     // the static helper function MakeCode.
     CompilationInfo info(literal, script, false);
 
-    CHECK(!FLAG_always_full_compiler || !FLAG_always_fast_compiler);
     bool is_run_once = literal->try_full_codegen();
     bool is_compiled = false;
 
     if (AlwaysFullCompiler()) {
       code = FullCodeGenerator::MakeCode(&info);
       is_compiled = true;
     } else if (FLAG_full_compiler && is_run_once) {
       FullCodeGenSyntaxChecker checker;
       checker.Check(literal);
       if (checker.has_supported_syntax()) {
         code = FullCodeGenerator::MakeCode(&info);
         is_compiled = true;
       }
-    } else if (FLAG_always_fast_compiler ||
-               (FLAG_fast_compiler && !is_run_once)) {
-      // Since we are not lazily compiling we do not have a receiver to
-      // specialize for.
-      FastCodeGenSyntaxChecker checker;
-      checker.Check(&info);
-      if (checker.has_supported_syntax()) {
-        code = FastCodeGenerator::MakeCode(&info);
-        is_compiled = true;
-      }
     }
 
     if (!is_compiled) {
       // We fall back to the classic V8 code generator.
       code = CodeGenerator::MakeCode(&info);
     }
 
     // Check for stack-overflow exception.
     if (code.is_null()) {
       caller->SetStackOverflow();
@@ skipping 80 matching lines @@
       PROFILE(CodeCreateEvent(Logger::ToNativeByScript(tag, *script),
                               *code, *func_name));
       OPROFILE(CreateNativeCodeRegion(*func_name,
                                       code->instruction_start(),
                                       code->instruction_size()));
     }
   }
 }
 
 } }  // namespace v8::internal