[turbofan] Add binary operation hints for javascript operators.

src/compiler/type-hint-analyzer.cc

Index: src/compiler/type-hint-analyzer.cc
diff --git a/src/compiler/type-hint-analyzer.cc b/src/compiler/type-hint-analyzer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e86f94ab9f531e973437940a878e2bc723190594
--- /dev/null
+++ b/src/compiler/type-hint-analyzer.cc
@@ -0,0 +1,71 @@
+// Copyright 2015 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/compiler/type-hint-analyzer.h"
+
+#include "src/assembler.h"
+#include "src/compiler/type-hints.h"
+#include "src/ic/ic-state.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+namespace {
+
+// TODO(bmeurer): This detour via types is ugly.
+BinaryOperationHints::Hint ToHint(Type* type) {
+  if (type->Is(Type::None())) return BinaryOperationHints::kNone;
+  if (type->Is(Type::SignedSmall())) return BinaryOperationHints::kSignedSmall;
+  if (type->Is(Type::Signed32())) return BinaryOperationHints::kSigned32;
+  if (type->Is(Type::Number())) return BinaryOperationHints::kNumber;
+  if (type->Is(Type::String())) return BinaryOperationHints::kString;
+  return BinaryOperationHints::kAny;
+}
+
+}  // namespace
+
+
+bool TypeHintAnalysis::GetBinaryOperationHints(
+    TypeFeedbackId id, BinaryOperationHints* hints) const {
+  auto i = infos_.find(id);
+  if (i == infos_.end()) return false;
+  Handle<Code> code = i->second;
+  DCHECK_EQ(Code::BINARY_OP_IC, code->kind());
+  BinaryOpICState state(code->GetIsolate(), code->extra_ic_state());
+  *hints = BinaryOperationHints(ToHint(state.GetLeftType()),
+                                ToHint(state.GetRightType()),
+                                ToHint(state.GetResultType()));
+  return true;
+}
+
+
+TypeHintAnalysis* TypeHintAnalyzer::Analyze(Handle<Code> code) {
+  DisallowHeapAllocation no_gc;
+  TypeHintAnalysis::Infos infos(zone());
+  Isolate* const isolate = code->GetIsolate();
+  int const mask = RelocInfo::ModeMask(RelocInfo::CODE_TARGET_WITH_ID);
+  for (RelocIterator it(*code, mask); !it.done(); it.next()) {
+    RelocInfo* rinfo = it.rinfo();
+    Address target_address = rinfo->target_address();
+    Code* target = Code::GetCodeFromTargetAddress(target_address);
+    switch (target->kind()) {
+      case Code::BINARY_OP_IC: {
+        // Add this feedback to the {infos}.
+        TypeFeedbackId id(static_cast<unsigned>(rinfo->data()));
+        infos.insert(std::make_pair(id, handle(target, isolate)));
+        break;
+      }
+
+      default:
+        // Ignore the remaining code objects.
+        break;
+    }
+  }
+  return new (zone()) TypeHintAnalysis(infos);
+}
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8