1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/*
* Copyright (C) 2016 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_OPTIMIZING_REGISTER_ALLOCATOR_H_
#define ART_COMPILER_OPTIMIZING_REGISTER_ALLOCATOR_H_
#include "arch/instruction_set.h"
#include "base/array_ref.h"
#include "base/arena_object.h"
#include "base/macros.h"
namespace art {
class CodeGenerator;
class HBasicBlock;
class HGraph;
class HInstruction;
class HParallelMove;
class LiveInterval;
class Location;
class SsaLivenessAnalysis;
/**
* Base class for any register allocator.
*/
class RegisterAllocator : public DeletableArenaObject<kArenaAllocRegisterAllocator> {
public:
enum Strategy {
kRegisterAllocatorLinearScan,
kRegisterAllocatorGraphColor
};
static constexpr Strategy kRegisterAllocatorDefault = kRegisterAllocatorLinearScan;
static std::unique_ptr<RegisterAllocator> Create(ScopedArenaAllocator* allocator,
CodeGenerator* codegen,
const SsaLivenessAnalysis& analysis,
Strategy strategy = kRegisterAllocatorDefault);
virtual ~RegisterAllocator();
// Main entry point for the register allocator. Given the liveness analysis,
// allocates registers to live intervals.
virtual void AllocateRegisters() = 0;
// Validate that the register allocator did not allocate the same register to
// intervals that intersect each other. Returns false if it failed.
virtual bool Validate(bool log_fatal_on_failure) = 0;
static bool CanAllocateRegistersFor(const HGraph& graph,
InstructionSet instruction_set);
// Verifies that live intervals do not conflict. Used by unit testing.
static bool ValidateIntervals(ArrayRef<LiveInterval* const> intervals,
size_t number_of_spill_slots,
size_t number_of_out_slots,
const CodeGenerator& codegen,
bool processing_core_registers,
bool log_fatal_on_failure);
static constexpr const char* kRegisterAllocatorPassName = "register";
protected:
RegisterAllocator(ScopedArenaAllocator* allocator,
CodeGenerator* codegen,
const SsaLivenessAnalysis& analysis);
// Split `interval` at the position `position`. The new interval starts at `position`.
// If `position` is at the start of `interval`, returns `interval` with its
// register location(s) cleared.
static LiveInterval* Split(LiveInterval* interval, size_t position);
// Split `interval` at a position between `from` and `to`. The method will try
// to find an optimal split position.
LiveInterval* SplitBetween(LiveInterval* interval, size_t from, size_t to);
ScopedArenaAllocator* const allocator_;
CodeGenerator* const codegen_;
const SsaLivenessAnalysis& liveness_;
};
} // namespace art
#endif // ART_COMPILER_OPTIMIZING_REGISTER_ALLOCATOR_H_
|
