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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rcc/CodeGen/FinalizeISel.h"
#include "rcc/CodeGen/InstructionDescriptor.h"
#include "rcc/CodeGen/MachineBasicBlock.h"
#include "rcc/CodeGen/MachineFrameInfo.h"
#include "rcc/CodeGen/MachineFunction.h"
#include "rcc/CodeGen/MachineInstr.h"
#include "rcc/CodeGen/TargetDescription.h"
#include <utility>
namespace rcc {
namespace {
[[nodiscard]] const MachinePassContract &finalizeISelContract() {
static const MachinePassContract Contract = [] {
MachinePassContract Value{
.Name = "finalize-isel",
.Requires = {},
.Sets = {},
.Clears = {},
.RequiredAnalyses = {},
.VerificationStage = PipelineStage::Selected,
};
Value.ThreadSafety = PassThreadSafety::ThreadSafe;
Value.DeclaredChanges = {MachinePassChange::Instructions, MachinePassChange::Operands,
MachinePassChange::CFG, MachinePassChange::BlockLayout,
MachinePassChange::Frame};
return Value;
}();
return Contract;
}
} // namespace
const MachinePassContract &FinalizeISelPass::contract() const noexcept {
return finalizeISelContract();
}
Expected<MachinePassResult> FinalizeISelPass::run(MachineFunction &Function,
const TargetDescription &Target,
MachineFunctionAnalysisManager &) {
MachinePassResult Result;
MachineBasicBlock *Block = Function.firstBlock();
while (Block != nullptr) {
MachineInstr *Instruction = Block->firstInstruction();
while (Instruction != nullptr) {
MachineInstr *Next = Instruction->next();
const InstructionDescriptor *Descriptor = Target.instructionDescriptor(Instruction->opcode());
if (Descriptor == nullptr) {
return makeUnexpected(ErrorCode::VerificationError,
"finalize-isel encountered an unknown opcode");
}
if (Instruction->flags().has(MachineInstrFlag::FrameSetup) ||
Instruction->flags().has(MachineInstrFlag::FrameDestroy)) {
MachineFrameState State = Function.frameInfo().state();
if (!State.AdjustsStack) {
State.AdjustsStack = true;
auto Updated = Function.frameInfo().setState(std::move(State));
if (!Updated)
return std::unexpected(Updated.error());
Result.Changes.add(MachinePassChange::Frame);
}
}
if (!Descriptor->Flags.has(InstructionFlag::UsesCustomInserter)) {
Instruction = Next;
continue;
}
auto Expanded = Info->emitInstrWithCustomInserter(*Instruction, *Block, Function, Target);
if (!Expanded)
return std::unexpected(Expanded.error());
if (*Expanded == nullptr || &(*Expanded)->function() != &Function) {
return makeUnexpected(ErrorCode::InternalError,
"custom inserter returned an invalid basic block");
}
Result.Changes.add(MachinePassChange::Instructions);
Result.Changes.add(MachinePassChange::Operands);
if (*Expanded != Block) {
Result.Changes.add(MachinePassChange::CFG);
Result.Changes.add(MachinePassChange::BlockLayout);
Block = *Expanded;
Instruction = Block->firstInstruction();
} else {
Instruction = Next;
}
}
Block = Block->next();
}
Result.Changed = !Result.Changes.empty();
Result.Preserved = Result.Changed ? PreservedAnalyses::none() : PreservedAnalyses::all();
return Result;
}
} // namespace rcc
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