Emit comment with instruction+reason before deopt calls.

src/arm64/lithium-codegen-arm64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ARM64_LITHIUM_CODEGEN_ARM64_H_
 #define V8_ARM64_LITHIUM_CODEGEN_ARM64_H_
 
 #include "src/arm64/lithium-arm64.h"
 
 #include "src/arm64/lithium-gap-resolver-arm64.h"
 #include "src/deoptimizer.h"
 #include "src/lithium-codegen.h"
 #include "src/safepoint-table.h"
 #include "src/scopes.h"
 #include "src/utils.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class LDeferredCode;
 class SafepointGenerator;
 class BranchGenerator;
 
 class LCodeGen: public LCodeGenBase {
  public:
   LCodeGen(LChunk* chunk, MacroAssembler* assembler, CompilationInfo* info)
       : LCodeGenBase(chunk, assembler, info),
         deoptimizations_(4, info->zone()),
-        deopt_jump_table_(4, info->zone()),
+        jump_table_(4, info->zone()),
         deoptimization_literals_(8, info->zone()),
         inlined_function_count_(0),
         scope_(info->scope()),
         translations_(info->zone()),
         deferred_(8, info->zone()),
         osr_pc_offset_(-1),
         frame_is_built_(false),
         safepoints_(info->zone()),
         resolver_(this),
         expected_safepoint_kind_(Safepoint::kSimple),
@@ skipping 165 matching lines @@
                          SmiCheck check_needed);
 
   int DefineDeoptimizationLiteral(Handle<Object> literal);
   void PopulateDeoptimizationData(Handle<Code> code);
   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 
   MemOperand BuildSeqStringOperand(Register string,
                                    Register temp,
                                    LOperand* index,
                                    String::Encoding encoding);
-  void DeoptimizeBranch(LInstruction* instr, BranchType branch_type,
-                        Register reg = NoReg, int bit = -1,
+  void DeoptimizeBranch(LInstruction* instr, const char* reason,
+                        BranchType branch_type, Register reg = NoReg,
+                        int bit = -1,
                         Deoptimizer::BailoutType* override_bailout_type = NULL);
   void Deoptimize(LInstruction* instr,
-                  Deoptimizer::BailoutType* override_bailout_type = NULL);
-  void DeoptimizeIf(Condition cond, LInstruction* instr);
-  void DeoptimizeIfZero(Register rt, LInstruction* instr);
-  void DeoptimizeIfNotZero(Register rt, LInstruction* instr);
-  void DeoptimizeIfNegative(Register rt, LInstruction* instr);
-  void DeoptimizeIfSmi(Register rt, LInstruction* instr);
-  void DeoptimizeIfNotSmi(Register rt, LInstruction* instr);
+                  Deoptimizer::BailoutType* override_bailout_type = NULL,
+                  const char* reason = NULL);
+  void DeoptimizeIf(Condition cond, LInstruction* instr,
+                    const char* reason = NULL);
+  void DeoptimizeIfZero(Register rt, LInstruction* instr,
+                        const char* reason = NULL);
+  void DeoptimizeIfNotZero(Register rt, LInstruction* instr,
+                           const char* reason = NULL);
+  void DeoptimizeIfNegative(Register rt, LInstruction* instr,
+                            const char* reason = NULL);
+  void DeoptimizeIfSmi(Register rt, LInstruction* instr,
+                       const char* reason = NULL);
+  void DeoptimizeIfNotSmi(Register rt, LInstruction* instr,
+                          const char* reason = NULL);
   void DeoptimizeIfRoot(Register rt, Heap::RootListIndex index,
-                        LInstruction* instr);
+                        LInstruction* instr, const char* reason = NULL);
   void DeoptimizeIfNotRoot(Register rt, Heap::RootListIndex index,
-                           LInstruction* instr);
-  void DeoptimizeIfMinusZero(DoubleRegister input, LInstruction* instr);
-  void DeoptimizeIfBitSet(Register rt, int bit, LInstruction* instr);
-  void DeoptimizeIfBitClear(Register rt, int bit, LInstruction* instr);
+                           LInstruction* instr, const char* reason = NULL);
+  void DeoptimizeIfMinusZero(DoubleRegister input, LInstruction* instr,
+                             const char* reason = NULL);
+  void DeoptimizeIfBitSet(Register rt, int bit, LInstruction* instr,
+                          const char* reason = NULL);
+  void DeoptimizeIfBitClear(Register rt, int bit, LInstruction* instr,
+                            const char* reason = NULL);
 
   MemOperand PrepareKeyedExternalArrayOperand(Register key,
                                               Register base,
                                               Register scratch,
                                               bool key_is_smi,
                                               bool key_is_constant,
                                               int constant_key,
                                               ElementsKind elements_kind,
                                               int base_offset);
   MemOperand PrepareKeyedArrayOperand(Register base,
@@ skipping 22 matching lines @@
                         int* object_index_pointer,
                         int* dematerialized_index_pointer);
 
   void SaveCallerDoubles();
   void RestoreCallerDoubles();
 
   // Code generation steps.  Returns true if code generation should continue.
   void GenerateBodyInstructionPre(LInstruction* instr) OVERRIDE;
   bool GeneratePrologue();
   bool GenerateDeferredCode();
-  bool GenerateDeoptJumpTable();
+  bool GenerateJumpTable();
   bool GenerateSafepointTable();
 
   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
   void GenerateOsrPrologue();
 
   enum SafepointMode {
     RECORD_SIMPLE_SAFEPOINT,
     RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS
   };
 
@@ skipping 44 matching lines @@
   void RecordSafepoint(Safepoint::DeoptMode mode);
   void RecordSafepointWithRegisters(LPointerMap* pointers,
                                     int arguments,
                                     Safepoint::DeoptMode mode);
   void RecordSafepointWithLazyDeopt(LInstruction* instr,
                                     SafepointMode safepoint_mode);
 
   void EnsureSpaceForLazyDeopt(int space_needed) OVERRIDE;
 
   ZoneList<LEnvironment*> deoptimizations_;
-  ZoneList<Deoptimizer::JumpTableEntry*> deopt_jump_table_;
+  ZoneList<Deoptimizer::JumpTableEntry*> jump_table_;
   ZoneList<Handle<Object> > deoptimization_literals_;
   int inlined_function_count_;
   Scope* const scope_;
   TranslationBuffer translations_;
   ZoneList<LDeferredCode*> deferred_;
   int osr_pc_offset_;
   bool frame_is_built_;
 
   // Builder that keeps track of safepoints in the code. The table itself is
   // emitted at the end of the generated code.
@@ skipping 100 matching lines @@
 
  protected:
   MacroAssembler* masm() const { return codegen_->masm(); }
 
   LCodeGen* codegen_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM64_LITHIUM_CODEGEN_ARM64_H_