X64: Add a jumptable to for deoptimization checks on X64....

src/x64/lithium-codegen-x64.h

 // Copyright 2011 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 35 matching lines @@
 class LCodeGen BASE_EMBEDDED {
  public:
   LCodeGen(LChunk* chunk, MacroAssembler* assembler, CompilationInfo* info)
       : chunk_(chunk),
         masm_(assembler),
         info_(info),
         current_block_(-1),
         current_instruction_(-1),
         instructions_(chunk->instructions()),
         deoptimizations_(4),
+        jump_table_(4),

[Lasse Reichstein, 2011/02/28 08:42:30]

If possible, remove the 4 (and the 4 above). Just rely on the ZoneList default
initial capacity (which, IIRC, happens to be 4).

[Rico, 2011/02/28 09:57:13]

There is no default ZoneList constructor

         deoptimization_literals_(8),
         inlined_function_count_(0),
         scope_(chunk->graph()->info()->scope()),
         status_(UNUSED),
         deferred_(8),
         osr_pc_offset_(-1),
         resolver_(this) {
     PopulateDeoptimizationLiteralsWithInlinedFunctions();
   }
 
@@ skipping 74 matching lines @@
   void Abort(const char* format, ...);
   void Comment(const char* format, ...);
 
   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code); }
 
   // Code generation passes.  Returns true if code generation should
   // continue.
   bool GeneratePrologue();
   bool GenerateBody();
   bool GenerateDeferredCode();
+  bool GenerateJumpTable();
   bool GenerateSafepointTable();
 
   void CallCode(Handle<Code> code,
                 RelocInfo::Mode mode,
                 LInstruction* instr);
   void CallRuntime(Runtime::Function* function,
                    int num_arguments,
                    LInstruction* instr);
   void CallRuntime(Runtime::FunctionId id,
                    int num_arguments,
@@ skipping 67 matching lines @@
                          Label* is_not_object,
                          Label* is_object);
 
   // Emits optimized code for %_IsConstructCall().
   // Caller should branch on equal condition.
   void EmitIsConstructCall(Register temp);
 
   // Emits code for pushing a constant operand.
   void EmitPushConstantOperand(LOperand* operand);
 
+  struct JumpTableEntry {

[Lasse Reichstein, 2011/02/28 08:42:30]

Have a constructor to initialize label and address.

[Rico, 2011/02/28 09:57:13]

Done.

+    Label label;
+    Address address;
+  };
+
   LChunk* const chunk_;
   MacroAssembler* const masm_;
   CompilationInfo* const info_;
 
   int current_block_;
   int current_instruction_;
   const ZoneList<LInstruction*>* instructions_;
   ZoneList<LEnvironment*> deoptimizations_;
+  ZoneList<JumpTableEntry*> jump_table_;
   ZoneList<Handle<Object> > deoptimization_literals_;
   int inlined_function_count_;
   Scope* const scope_;
   Status status_;
   TranslationBuffer translations_;
   ZoneList<LDeferredCode*> deferred_;
   int osr_pc_offset_;
 
   // Builder that keeps track of safepoints in the code. The table
   // itself is emitted at the end of the generated code.
@@ skipping 30 matching lines @@
  private:
   LCodeGen* codegen_;
   Label entry_;
   Label exit_;
   Label* external_exit_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_LITHIUM_CODEGEN_X64_H_