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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rcc/CodeGen/MachineBasicBlock.h"
#include "rcc/CodeGen/MachineFunction.h"
#include "rcc/CodeGen/MachineInstr.h"
#include <algorithm>
#include <cstddef>
namespace rcc {
std::size_t MachineBasicBlock::instructionCount() const noexcept {
std::size_t Count = 0;
for (const MachineInstr *Instruction = FirstInstruction; Instruction != nullptr;
Instruction = Instruction->next()) {
++Count;
}
return Count;
}
Expected<void> MachineBasicBlock::appendInstruction(MachineInstr &Instruction) {
if (&Instruction.function() != OwnerFunction) {
return makeUnexpected(ErrorCode::InvalidArgument,
"instruction belongs to another machine function");
}
if (Instruction.isLinked()) {
return makeUnexpected(ErrorCode::InvalidArgument,
"instruction is already linked to a basic block");
}
auto AttachResult = Instruction.attachToBlock(*this);
if (!AttachResult)
return std::unexpected(AttachResult.error());
Instruction.PreviousInstruction = LastInstruction;
Instruction.NextInstruction = nullptr;
if (LastInstruction != nullptr)
LastInstruction->NextInstruction = &Instruction;
else
FirstInstruction = &Instruction;
LastInstruction = &Instruction;
return {};
}
Expected<void> MachineBasicBlock::insertInstructionBefore(MachineInstr &Position,
MachineInstr &Instruction) {
if (Position.parent() != this) {
return makeUnexpected(ErrorCode::InvalidArgument,
"instruction insertion position is not in this block");
}
if (&Instruction.function() != OwnerFunction || Instruction.isLinked()) {
return makeUnexpected(ErrorCode::InvalidArgument,
"inserted instruction is linked or belongs to another function");
}
auto AttachResult = Instruction.attachToBlock(*this);
if (!AttachResult)
return std::unexpected(AttachResult.error());
Instruction.PreviousInstruction = Position.PreviousInstruction;
Instruction.NextInstruction = &Position;
if (Position.PreviousInstruction != nullptr)
Position.PreviousInstruction->NextInstruction = &Instruction;
else
FirstInstruction = &Instruction;
Position.PreviousInstruction = &Instruction;
return {};
}
Expected<void> MachineBasicBlock::insertInstructionAfter(MachineInstr &Position,
MachineInstr &Instruction) {
if (Position.parent() != this) {
return makeUnexpected(ErrorCode::InvalidArgument,
"instruction insertion position is not in this block");
}
if (&Instruction.function() != OwnerFunction || Instruction.isLinked()) {
return makeUnexpected(ErrorCode::InvalidArgument,
"inserted instruction is linked or belongs to another function");
}
auto AttachResult = Instruction.attachToBlock(*this);
if (!AttachResult)
return std::unexpected(AttachResult.error());
Instruction.PreviousInstruction = &Position;
Instruction.NextInstruction = Position.NextInstruction;
if (Position.NextInstruction != nullptr)
Position.NextInstruction->PreviousInstruction = &Instruction;
else
LastInstruction = &Instruction;
Position.NextInstruction = &Instruction;
return {};
}
Expected<void> MachineBasicBlock::removeInstruction(MachineInstr &Instruction) {
if (Instruction.parent() != this) {
return makeUnexpected(ErrorCode::InvalidArgument, "instruction does not belong to this block");
}
if (Instruction.PreviousInstruction != nullptr)
Instruction.PreviousInstruction->NextInstruction = Instruction.NextInstruction;
else
FirstInstruction = Instruction.NextInstruction;
if (Instruction.NextInstruction != nullptr)
Instruction.NextInstruction->PreviousInstruction = Instruction.PreviousInstruction;
else
LastInstruction = Instruction.PreviousInstruction;
Instruction.detachFromBlock();
return {};
}
void MachineBasicBlock::clearInstructions() noexcept {
MachineInstr *Instruction = FirstInstruction;
while (Instruction != nullptr) {
MachineInstr *NextInstruction = Instruction->NextInstruction;
Instruction->detachFromBlock();
Instruction = NextInstruction;
}
FirstInstruction = nullptr;
LastInstruction = nullptr;
}
Expected<void> MachineBasicBlock::addLiveIn(PhysicalRegister PhysReg, LaneMask Lanes) {
if (!PhysReg.isValid() || Lanes.empty()) {
return makeUnexpected(ErrorCode::InvalidArgument,
"block live-in requires a physical register and nonempty lanes");
}
const auto Position =
std::ranges::find_if(LiveIns, [PhysReg](const MachineBasicBlockLiveIn &LiveIn) {
return LiveIn.PhysReg == PhysReg;
});
if (Position != LiveIns.end()) {
Position->Lanes = Position->Lanes | Lanes;
return {};
}
LiveIns.push_back(MachineBasicBlockLiveIn{PhysReg, Lanes});
return {};
}
Expected<void> MachineBasicBlock::removeLiveIn(PhysicalRegister PhysReg) {
const auto Position =
std::ranges::find_if(LiveIns, [PhysReg](const MachineBasicBlockLiveIn &LiveIn) {
return LiveIn.PhysReg == PhysReg;
});
if (Position == LiveIns.end()) {
return makeUnexpected(ErrorCode::InvalidArgument, "block physical live-in is not present");
}
LiveIns.erase(Position);
return {};
}
} // namespace rcc
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