Emit comment with instruction+reason before deopt calls.

src/mips64/lithium-codegen-mips64.cc

 // Copyright 2012 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.
 
 #include "src/v8.h"
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/hydrogen-osr.h"
 #include "src/ic/ic.h"
@@ skipping 756 matching lines @@
     environment->Register(deoptimization_index,
                           translation.index(),
                           (mode == Safepoint::kLazyDeopt) ? pc_offset : -1);
     deoptimizations_.Add(environment, zone());
   }
 }
 
 
 void LCodeGen::DeoptimizeIf(Condition condition, LInstruction* instr,
                             Deoptimizer::BailoutType bailout_type,
-                            Register src1, const Operand& src2) {
+                            Register src1, const Operand& src2,
+                            const char* reason) {
   LEnvironment* environment = instr->environment();
   RegisterEnvironmentForDeoptimization(environment, Safepoint::kNoLazyDeopt);
   DCHECK(environment->HasBeenRegistered());
   int id = environment->deoptimization_index();
   DCHECK(info()->IsOptimizing() || info()->IsStub());
   Address entry =
       Deoptimizer::GetDeoptimizationEntry(isolate(), id, bailout_type);
   if (entry == NULL) {
     Abort(kBailoutWasNotPrepared);
     return;
@@ skipping 25 matching lines @@
     }
     __ stop("trap_on_deopt");
     __ bind(&skip);
   }
 
   DCHECK(info()->IsStub() || frame_is_built_);
   // Go through jump table if we need to handle condition, build frame, or
   // restore caller doubles.
   if (condition == al && frame_is_built_ &&
       !info()->saves_caller_doubles()) {
+    DeoptComment(instr->Mnemonic(), reason);
     __ Call(entry, RelocInfo::RUNTIME_ENTRY, condition, src1, src2);
   } else {
     // We often have several deopts to the same entry, reuse the last
     // jump entry if this is the case.
     if (deopt_jump_table_.is_empty() ||
         (deopt_jump_table_.last().address != entry) ||
         (deopt_jump_table_.last().bailout_type != bailout_type) ||
         (deopt_jump_table_.last().needs_frame != !frame_is_built_)) {
-      Deoptimizer::JumpTableEntry table_entry(entry,
-                                              bailout_type,
-                                              !frame_is_built_);
+      Deoptimizer::JumpTableEntry table_entry(entry, instr->Mnemonic(), reason,
+                                              bailout_type, !frame_is_built_);
       deopt_jump_table_.Add(table_entry, zone());
     }
     __ Branch(&deopt_jump_table_.last().label, condition, src1, src2);
   }
 }
 
 
 void LCodeGen::DeoptimizeIf(Condition condition, LInstruction* instr,
-                            Register src1, const Operand& src2) {
+                            Register src1, const Operand& src2,
+                            const char* reason) {
   Deoptimizer::BailoutType bailout_type = info()->IsStub()
       ? Deoptimizer::LAZY
       : Deoptimizer::EAGER;
-  DeoptimizeIf(condition, instr, bailout_type, src1, src2);
+  DeoptimizeIf(condition, instr, bailout_type, src1, src2, reason);
 }
 
 
 void LCodeGen::PopulateDeoptimizationData(Handle<Code> code) {
   int length = deoptimizations_.length();
   if (length == 0) return;
   Handle<DeoptimizationInputData> data =
       DeoptimizationInputData::New(isolate(), length, TENURED);
 
   Handle<ByteArray> translations =
@@ skipping 4848 matching lines @@
 void LCodeGen::DoDeoptimize(LDeoptimize* instr) {
   Deoptimizer::BailoutType type = instr->hydrogen()->type();
   // TODO(danno): Stubs expect all deopts to be lazy for historical reasons (the
   // needed return address), even though the implementation of LAZY and EAGER is
   // now identical. When LAZY is eventually completely folded into EAGER, remove
   // the special case below.
   if (info()->IsStub() && type == Deoptimizer::EAGER) {
     type = Deoptimizer::LAZY;
   }
 
-  Comment(";;; deoptimize: %s", instr->hydrogen()->reason());
-  DeoptimizeIf(al, instr, type, zero_reg, Operand(zero_reg));
+  DeoptimizeIf(al, instr, type, zero_reg, Operand(zero_reg),
+               instr->hydrogen()->reason());
 }
 
 
 void LCodeGen::DoDummy(LDummy* instr) {
   // Nothing to see here, move on!
 }
 
 
 void LCodeGen::DoDummyUse(LDummyUse* instr) {
   // Nothing to see here, move on!
@@ skipping 222 matching lines @@
   __ li(at, scope_info);
   __ Push(at, ToRegister(instr->function()));
   CallRuntime(Runtime::kPushBlockContext, 2, instr);
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal