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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
// SPDX-License-Identifier: GPL-3.0-or-later
#include "rcc/CodeGen/MachineFunction.h"
#include "rcc/CodeGen/MachineBasicBlock.h"
#include "rcc/CodeGen/MachineCFGUpdater.h"
#include "rcc/CodeGen/MachineInstr.h"
#include "rcc/CodeGen/MachineMemOperand.h"
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <memory>
#include <memory_resource>
#include <new>
#include <utility>
#include <vector>
namespace rcc {
class MachineArena final {
public:
MachineArena() = default;
MachineArena(const MachineArena &) = delete;
MachineArena &operator=(const MachineArena &) = delete;
MachineArena(MachineArena &&) = delete;
MachineArena &operator=(MachineArena &&) = delete;
~MachineArena() {
for (auto Position = Destructors.rbegin(); Position != Destructors.rend(); ++Position)
Position->Destroy(Position->Object);
}
template <typename ObjectT, typename... ArgumentTs>
[[nodiscard]] ObjectT *create(ArgumentTs &&...Arguments) {
void *Storage = Resource.allocate(sizeof(ObjectT), alignof(ObjectT));
ObjectT *Object = ::new (Storage) ObjectT(std::forward<ArgumentTs>(Arguments)...);
auto DestroyObject = [](ObjectT *TypedObject) noexcept { std::destroy_at(TypedObject); };
std::unique_ptr<ObjectT, decltype(DestroyObject)> ConstructionGuard(Object, DestroyObject);
Destructors.push_back(DestructorRecord{
Object,
[](void *RawObject) noexcept { std::destroy_at(static_cast<ObjectT *>(RawObject)); },
});
return ConstructionGuard.release();
}
private:
struct DestructorRecord final {
void *Object;
void (*Destroy)(void *) noexcept;
};
std::pmr::monotonic_buffer_resource Resource;
std::vector<DestructorRecord> Destructors;
};
Expected<std::unique_ptr<MachineFunction>>
MachineFunction::create(std::string Name, MachineFunctionStableID StableID) {
if (Name.empty())
return makeUnexpected(ErrorCode::InvalidArgument, "machine function name cannot be empty");
if (!StableID.isValid())
return makeUnexpected(ErrorCode::InvalidArgument, "machine function StableID must be valid");
return std::unique_ptr<MachineFunction>(new MachineFunction(std::move(Name), StableID));
}
MachineFunction::MachineFunction(std::string Name, MachineFunctionStableID StableID)
: Name(std::move(Name)), StableID(StableID), JumpTables(*this),
Arena(std::make_unique<MachineArena>()) {}
MachineFunction::~MachineFunction() {
for (MachineBasicBlock *Block = FirstBlock; Block != nullptr; Block = Block->NextBlock) {
Block->clearInstructions();
Block->Predecessors.clear();
Block->Successors.clear();
}
}
Expected<void> MachineFunction::setTargetState(TargetFunctionState State) {
if (TargetState.hasValue()) {
return makeUnexpected(ErrorCode::InvalidArgument, "machine function already has target state");
}
auto Verification = State.verify();
if (!Verification)
return std::unexpected(Verification.error());
TargetState = std::move(State);
return {};
}
Expected<MachineBasicBlock *> MachineFunction::createBasicBlock() {
auto ID = BlockIDGenerator.allocate();
if (!ID)
return std::unexpected(ID.error());
MachineBasicBlock *Block = Arena->create<MachineBasicBlock>(*this, *ID);
AllBlocks.push_back(Block);
return Block;
}
Expected<MachineInstr *> MachineFunction::createInstruction(Opcode InstructionOpcode) {
if (!InstructionOpcode.isValid())
return makeUnexpected(ErrorCode::InvalidArgument, "machine opcode must be nonzero");
auto ID = InstrIDGenerator.allocate();
if (!ID)
return std::unexpected(ID.error());
MachineInstr *Instruction = Arena->create<MachineInstr>(*this, InstructionOpcode, *ID);
AllInstructions.push_back(Instruction);
return Instruction;
}
Expected<const MachineMemOperand *>
MachineFunction::createMemOperand(MachineMemOperandDesc Description) {
auto MemOperand = MachineMemOperand::create(std::move(Description));
if (!MemOperand)
return std::unexpected(MemOperand.error());
const MachineMemOperand *Stored = Arena->create<MachineMemOperand>(std::move(*MemOperand));
AllMemOperands.push_back(Stored);
return Stored;
}
Expected<void> MachineFunction::appendBlock(MachineBasicBlock &Block) {
if (Block.OwnerFunction != this)
return makeUnexpected(ErrorCode::InvalidArgument,
"basic block belongs to another machine function");
if (Block.IsLinked)
return makeUnexpected(ErrorCode::InvalidArgument, "basic block is already linked");
Block.PreviousBlock = LastBlock;
Block.NextBlock = nullptr;
if (LastBlock != nullptr)
LastBlock->NextBlock = &Block;
else
FirstBlock = &Block;
LastBlock = &Block;
Block.IsLinked = true;
renumberBlocks();
return {};
}
Expected<void> MachineFunction::insertBlockBefore(MachineBasicBlock &Position,
MachineBasicBlock &Block) {
if (Position.OwnerFunction != this || !Position.IsLinked)
return makeUnexpected(ErrorCode::InvalidArgument,
"block insertion position is not linked to this function");
if (Block.OwnerFunction != this || Block.IsLinked)
return makeUnexpected(ErrorCode::InvalidArgument,
"inserted block is linked or belongs to another function");
Block.PreviousBlock = Position.PreviousBlock;
Block.NextBlock = &Position;
if (Position.PreviousBlock != nullptr)
Position.PreviousBlock->NextBlock = &Block;
else
FirstBlock = &Block;
Position.PreviousBlock = &Block;
Block.IsLinked = true;
renumberBlocks();
return {};
}
Expected<void> MachineFunction::removeBlock(MachineBasicBlock &Block) {
if (Block.OwnerFunction != this || !Block.IsLinked)
return makeUnexpected(ErrorCode::InvalidArgument,
"removed block is not linked to this function");
if (!Block.Predecessors.empty() || !Block.Successors.empty()) {
return makeUnexpected(ErrorCode::VerificationError,
"disconnect CFG edges before removing a basic block");
}
Block.clearInstructions();
if (Block.PreviousBlock != nullptr)
Block.PreviousBlock->NextBlock = Block.NextBlock;
else
FirstBlock = Block.NextBlock;
if (Block.NextBlock != nullptr)
Block.NextBlock->PreviousBlock = Block.PreviousBlock;
else
LastBlock = Block.PreviousBlock;
Block.IsLinked = false;
Block.PreviousBlock = nullptr;
Block.NextBlock = nullptr;
Block.DenseNumber.reset();
Block.LayoutIndex.reset();
renumberBlocks();
return {};
}
std::size_t MachineFunction::blockCount() const noexcept {
std::size_t Count = 0;
for (const MachineBasicBlock *Block = FirstBlock; Block != nullptr; Block = Block->next()) {
++Count;
}
return Count;
}
bool MachineFunction::ownsMemOperand(const MachineMemOperand &MemOperand) const noexcept {
return std::ranges::find(AllMemOperands, &MemOperand) != AllMemOperands.end();
}
MachineCFGUpdater MachineFunction::cfgUpdater() noexcept {
return MachineCFGUpdater(*this);
}
void MachineFunction::renumberBlocks() noexcept {
std::uint32_t Number = 0;
for (MachineBasicBlock *Block = FirstBlock; Block != nullptr; Block = Block->NextBlock) {
Block->DenseNumber = Number;
Block->LayoutIndex = Number;
++Number;
}
}
} // namespace rcc
|
