1 files changed, 143 insertions, 0 deletions
diff --git a/compiler/dex/local_value_numbering.h b/compiler/dex/local_value_numbering.h
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+++ b/compiler/dex/local_value_numbering.h
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+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_SRC_COMPILER_DEX_LOCAL_VALUE_NUMBERING_H_
+#define ART_SRC_COMPILER_DEX_LOCAL_VALUE_NUMBERING_H_
+
+#include "compiler_internals.h"
+
+#define NO_VALUE 0xffff
+#define ARRAY_REF 0xfffe
+
+namespace art {
+
+// Key is s_reg, value is value name.
+typedef SafeMap<uint16_t, uint16_t> SregValueMap;
+// Key is concatenation of quad, value is value name.
+typedef SafeMap<uint64_t, uint16_t> ValueMap;
+// Key represents a memory address, value is generation.
+typedef SafeMap<uint32_t, uint16_t> MemoryVersionMap;
+
+class LocalValueNumbering {
+ public:
+  LocalValueNumbering(CompilationUnit* cu) : cu_(cu) {};
+
+  static uint64_t BuildKey(uint16_t op, uint16_t operand1, uint16_t operand2, uint16_t modifier) {
+    return (static_cast<uint64_t>(op) << 48 | static_cast<uint64_t>(operand1) << 32 |
+            static_cast<uint64_t>(operand2) << 16 | static_cast<uint64_t>(modifier));
+  };
+
+  uint16_t LookupValue(uint16_t op, uint16_t operand1, uint16_t operand2, uint16_t modifier) {
+    uint16_t res;
+    uint64_t key = BuildKey(op, operand1, operand2, modifier);
+    ValueMap::iterator it = value_map_.find(key);
+    if (it != value_map_.end()) {
+      res = it->second;
+    } else {
+      res = value_map_.size() + 1;
+      value_map_.Put(key, res);
+    }
+    return res;
+  };
+
+  bool ValueExists(uint16_t op, uint16_t operand1, uint16_t operand2, uint16_t modifier) const {
+    uint64_t key = BuildKey(op, operand1, operand2, modifier);
+    ValueMap::const_iterator it = value_map_.find(key);
+    return (it != value_map_.end());
+  };
+
+  uint16_t GetMemoryVersion(uint16_t base, uint16_t field) {
+    uint32_t key = (base << 16) | field;
+    uint16_t res;
+    MemoryVersionMap::iterator it = memory_version_map_.find(key);
+    if (it == memory_version_map_.end()) {
+      res = 0;
+      memory_version_map_.Put(key, res);
+    } else {
+      res = it->second;
+    }
+    return res;
+  };
+
+  void AdvanceMemoryVersion(uint16_t base, uint16_t field) {
+    uint32_t key = (base << 16) | field;
+    MemoryVersionMap::iterator it = memory_version_map_.find(key);
+    if (it == memory_version_map_.end()) {
+      memory_version_map_.Put(key, 0);
+    } else {
+      it->second++;
+    }
+  };
+
+  void SetOperandValue(uint16_t s_reg, uint16_t value) {
+    SregValueMap::iterator it = sreg_value_map_.find(s_reg);
+    if (it != sreg_value_map_.end()) {
+      DCHECK_EQ(it->second, value);
+    } else {
+      sreg_value_map_.Put(s_reg, value);
+    }
+  };
+
+  uint16_t GetOperandValue(int s_reg) {
+    uint16_t res = NO_VALUE;
+    SregValueMap::iterator it = sreg_value_map_.find(s_reg);
+    if (it != sreg_value_map_.end()) {
+      res = it->second;
+    } else {
+      // First use
+      res = LookupValue(NO_VALUE, s_reg, NO_VALUE, NO_VALUE);
+      sreg_value_map_.Put(s_reg, res);
+    }
+    return res;
+  };
+
+  void SetOperandValueWide(uint16_t s_reg, uint16_t value) {
+    SregValueMap::iterator it = sreg_wide_value_map_.find(s_reg);
+    if (it != sreg_wide_value_map_.end()) {
+      DCHECK_EQ(it->second, value);
+    } else {
+      sreg_wide_value_map_.Put(s_reg, value);
+    }
+  };
+
+  uint16_t GetOperandValueWide(int s_reg) {
+    uint16_t res = NO_VALUE;
+    SregValueMap::iterator it = sreg_wide_value_map_.find(s_reg);
+    if (it != sreg_wide_value_map_.end()) {
+      res = it->second;
+    } else {
+      // First use
+      res = LookupValue(NO_VALUE, s_reg, NO_VALUE, NO_VALUE);
+      sreg_wide_value_map_.Put(s_reg, res);
+    }
+    return res;
+  };
+
+  uint16_t GetValueNumber(MIR* mir);
+
+ private:
+  CompilationUnit* const cu_;
+  SregValueMap sreg_value_map_;
+  SregValueMap sreg_wide_value_map_;
+  ValueMap value_map_;
+  MemoryVersionMap memory_version_map_;
+  std::set<uint16_t> null_checked_;
+
+};
+
+} // namespace art
+
+#endif   // ART_SRC_COMPILER_DEX_LOCAL_VALUE_NUMBERING_H_