A64: Synchronize with r16024.

src/hydrogen-mark-deoptimize.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
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 //
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-#include "hydrogen-escape-analysis.h"
+#include "hydrogen-mark-deoptimize.h"
 
 namespace v8 {
 namespace internal {
 
-
-void HEscapeAnalysisPhase::CollectIfNoEscapingUses(HInstruction* instr) {
-  for (HUseIterator it(instr->uses()); !it.Done(); it.Advance()) {
-    HValue* use = it.value();
-    if (use->HasEscapingOperandAt(it.index())) {
-      if (FLAG_trace_escape_analysis) {
-        PrintF("#%d (%s) escapes through #%d (%s) @%d\n", instr->id(),
-               instr->Mnemonic(), use->id(), use->Mnemonic(), it.index());
-      }
-      return;
-    }
-  }
-  if (FLAG_trace_escape_analysis) {
-    PrintF("#%d (%s) is being captured\n", instr->id(), instr->Mnemonic());
-  }
-  captured_.Add(instr, zone());
-}
-
-
-void HEscapeAnalysisPhase::CollectCapturedValues() {
-  int block_count = graph()->blocks()->length();
-  for (int i = 0; i < block_count; ++i) {
-    HBasicBlock* block = graph()->blocks()->at(i);
-    for (HInstructionIterator it(block); !it.Done(); it.Advance()) {
-      HInstruction* instr = it.Current();
-      if (instr->IsAllocate()) {
-        CollectIfNoEscapingUses(instr);
+void HMarkDeoptimizeOnUndefinedPhase::Run() {
+  const ZoneList<HPhi*>* phi_list = graph()->phi_list();
+  for (int i = 0; i < phi_list->length(); i++) {
+    HPhi* phi = phi_list->at(i);
+    if (phi->CheckFlag(HValue::kAllowUndefinedAsNaN)) {
+      for (HUseIterator it(phi->uses()); !it.Done(); it.Advance()) {
+        HValue* use_value = it.value();
+        if (!use_value->CheckFlag(HValue::kAllowUndefinedAsNaN)) {
+          ProcessPhi(phi);
+          break;
+        }
       }
     }
   }
 }
 
 
+void HMarkDeoptimizeOnUndefinedPhase::ProcessPhi(HPhi* phi) {
+  ASSERT(phi->CheckFlag(HValue::kAllowUndefinedAsNaN));
+  ASSERT(worklist_.is_empty());
+
+  // Push the phi onto the worklist
+  phi->ClearFlag(HValue::kAllowUndefinedAsNaN);
+  worklist_.Add(phi, zone());
+
+  // Process all phis that can reach this phi
+  while (!worklist_.is_empty()) {
+    phi = worklist_.RemoveLast();
+    for (int i = phi->OperandCount() - 1; i >= 0; --i) {
+      HValue* input = phi->OperandAt(i);
+      if (input->IsPhi() && input->CheckFlag(HValue::kAllowUndefinedAsNaN)) {
+        input->ClearFlag(HValue::kAllowUndefinedAsNaN);
+        worklist_.Add(HPhi::cast(input), zone());
+      }
+    }
+  }
+}
+
 } }  // namespace v8::internal