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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rcc/Tooling/BackendDriver.h"
#include "rcc/CodeGen/MIRPrinter.h"
#include "rcc/CodeGen/MachineFunction.h"
#include "rcc/Target/TargetMachine.h"
#include <cstddef>
#include <cstdint>
#include <string>
#include <string_view>
#include <utility>
#include <vector>
namespace rcc::tooling {
namespace {
[[nodiscard]] BackendStage outputStage(ArtifactKind Output) noexcept {
switch (Output) {
case ArtifactKind::PreLegalizerMIR:
return BackendStage::PreLegalizerMIR;
case ArtifactKind::LegalizedMIR:
return BackendStage::LegalizedMIR;
case ArtifactKind::RegisterBankMIR:
return BackendStage::RegisterBankMIR;
case ArtifactKind::SelectedMIR:
return BackendStage::SelectedMIR;
case ArtifactKind::PostSSAMIR:
return BackendStage::PostSSAMIR;
case ArtifactKind::PostRegisterAllocationMIR:
return BackendStage::PostRegisterAllocationMIR;
case ArtifactKind::FinalMIR:
case ArtifactKind::Assembly:
case ArtifactKind::RelocatableObject:
return BackendStage::FinalMIR;
}
return BackendStage::FinalMIR;
}
[[nodiscard]] Expected<std::vector<std::uint8_t>> printMIR(const mir::MIRDocument &Document,
const TargetDescription &Target,
const BackendInvocation &Invocation,
bool Simplify) {
mir::MIRDocumentPrinterOptions Options;
Options.Mode = Simplify ? mir::MIPrintMode::Readable : mir::MIPrintMode::Complete;
Options.EmitEmbeddedIR = true;
Options.DataLayout = Invocation.DataLayout;
auto Printed = mir::printMIRDocument(Document, Target, std::move(Options));
if (!Printed)
return std::unexpected(Printed.error());
return std::vector<std::uint8_t>(Printed->begin(), Printed->end());
}
} // namespace
std::string_view BackendRunResult::text() const noexcept {
if (Kind == ArtifactKind::RelocatableObject || Output.empty())
return {};
return {reinterpret_cast<const char *>(Output.data()), Output.size()};
}
Expected<BackendRunResult> runBackend(CanonicalMIR Input, const BackendInvocation &Invocation,
ArtifactKind Output, PipelineControls Controls,
MachinePassInstrumentation *Instrumentation) {
auto TargetMachine = createTargetMachine(Invocation);
if (!TargetMachine)
return std::unexpected(TargetMachine.error());
const TargetDescription &Target = (*TargetMachine)->targetDescription();
if (Input.Document.unit().functionCount() == 0) {
return makeUnexpected(ErrorCode::InvalidArgument,
"backend input must contain at least one machine function");
}
BackendStage InitialStage = BackendStage::FinalMIR;
for (std::size_t Index = 0; Index < Input.Document.unit().functionCount(); ++Index) {
const MachineFunction *Function = Input.Document.unit().functionAt(Index);
if (Function == nullptr)
return makeUnexpected(ErrorCode::InternalError, "backend input contains a null function");
const BackendStage Stage = stageForFunction(*Function);
if (Index == 0 || isEarlierStage(Stage, InitialStage))
InitialStage = Stage;
}
const BackendStage RequiredStage = outputStage(Output);
if (isMIRArtifact(Output) && isEarlierStage(RequiredStage, InitialStage)) {
return makeUnexpected(ErrorCode::InvalidInvocation,
"backend cannot reconstruct an earlier MIR stage from a later snapshot");
}
if (isMIRArtifact(Output)) {
if (Controls.StopAtStage && *Controls.StopAtStage != RequiredStage) {
return makeUnexpected(ErrorCode::InvalidInvocation,
"output stage conflicts with the explicit pipeline stop stage");
}
Controls.StopAtStage = RequiredStage;
}
const bool SimplifyMIR = Controls.SimplifyMIR;
MachinePassInstrumentation LocalInstrumentation;
MachinePassInstrumentation *ActiveInstrumentation =
Instrumentation == nullptr ? &LocalInstrumentation : Instrumentation;
auto Pipeline = runTargetPipeline(Input.Document, **TargetMachine, Invocation,
std::move(Controls), ActiveInstrumentation);
if (!Pipeline)
return std::unexpected(Pipeline.error());
std::vector<std::uint8_t> Bytes;
if (isMIRArtifact(Output)) {
auto Printed = printMIR(Input.Document, Target, Invocation, SimplifyMIR);
if (!Printed)
return std::unexpected(Printed.error());
Bytes = std::move(*Printed);
} else if (Output == ArtifactKind::Assembly) {
auto Assembly = (*TargetMachine)->emitAssembly(Input.Document.unit());
if (!Assembly)
return std::unexpected(Assembly.error());
Bytes.assign(Assembly->begin(), Assembly->end());
} else {
auto Object = (*TargetMachine)->emitObject(Input.Document.unit());
if (!Object)
return std::unexpected(Object.error());
Bytes = std::move(*Object);
}
return BackendRunResult{
.Kind = Output,
.Output = std::move(Bytes),
.Pipeline = std::move(*Pipeline),
.Actions = ActiveInstrumentation->actionEvents(),
};
}
} // namespace rcc::tooling
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