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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_COMPILER_DEX_LOCAL_VALUE_NUMBERING_H_
#define ART_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_COMPILER_DEX_LOCAL_VALUE_NUMBERING_H_
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