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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rcc/CodeGen/MachineFunction.h"
#include "rcc/CodeGen/MachineOptimizationPipeline.h"
#include "rcc/CodeGen/MachinePass.h"
#include "rcc/CodeGen/MachinePipelinePasses.h"
#include "rcc/CodeGen/MachineSSAExit.h"
#include "rcc/CodeGen/RegAllocPBQP.h"
#include "rcc/MIR/MIRDocument.h"
#include "rcc/Support/TextDiagnostic.h"
#include "rcc/Target/RISCV/RISCVAssemblyPrinter.h"
#include "rcc/Target/RISCV/RISCVCodeGen.h"
#include "rcc/Target/RISCV/RISCVTarget.h"
#include <fstream>
#include <iostream>
#include <iterator>
#include <memory>
#include <string>
#include <string_view>
#include <utility>
namespace {
struct CommandLine final {
std::string InputPath;
};
[[nodiscard]] bool parseCommandLine(int ArgumentCount, char *Arguments[], CommandLine &Result) {
for (int Index = 1; Index < ArgumentCount; ++Index) {
const std::string_view Argument(Arguments[Index]);
if (Argument != "--input" || Index + 1 >= ArgumentCount) {
std::cerr << "usage: rcc-backend-asm --input <mir-file|->\n";
return false;
}
Result.InputPath = Arguments[++Index];
}
if (Result.InputPath.empty()) {
std::cerr << "usage: rcc-backend-asm --input <mir-file|->\n";
return false;
}
return true;
}
[[nodiscard]] bool readInput(const CommandLine &Command, std::string &Contents) {
if (Command.InputPath == "-") {
Contents.assign(std::istreambuf_iterator<char>(std::cin), std::istreambuf_iterator<char>());
return true;
}
std::ifstream Input(Command.InputPath, std::ios::binary);
if (!Input) {
std::cerr << "rcc-backend-asm: cannot open input '" << Command.InputPath << "'\n";
return false;
}
Contents.assign(std::istreambuf_iterator<char>(Input), std::istreambuf_iterator<char>());
return true;
}
template <typename PassT, typename... ArgumentT>
[[nodiscard]] rcc::Expected<void> addPass(rcc::MachinePassManager &Pipeline,
ArgumentT &&...Arguments) {
return Pipeline.addPass(std::make_unique<PassT>(std::forward<ArgumentT>(Arguments)...));
}
[[nodiscard]] rcc::Expected<void> runBackendPipeline(rcc::MachineFunction &Function,
const rcc::TargetDescription &Target) {
rcc::MachinePassManager Pipeline;
const rcc::MachineOptimizationPipelineTargetInfo TargetInfo =
rcc::riscv::optimizationPipelineInfo();
if (!Function.properties().has(rcc::MachineFunctionProperty::Legalized)) {
auto Added = addPass<rcc::LegalizerPass>(Pipeline, rcc::riscv::legalizerInfo());
if (!Added)
return std::unexpected(Added.error());
}
if (!Function.properties().has(rcc::MachineFunctionProperty::RegBankSelected)) {
auto Added = addPass<rcc::RegisterBankSelectPass>(Pipeline, rcc::riscv::registerBankInfo());
if (!Added)
return std::unexpected(Added.error());
}
if (!Function.properties().has(rcc::MachineFunctionProperty::Selected)) {
auto Added = addPass<rcc::InstructionSelectPass>(Pipeline, rcc::riscv::instructionSelector());
if (!Added)
return std::unexpected(Added.error());
}
if (!Function.properties().has(rcc::MachineFunctionProperty::NoPHIs)) {
auto Added = rcc::addSelectedSSAOptimizationPipeline(Pipeline, TargetInfo);
if (!Added)
return std::unexpected(Added.error());
Added = addPass<rcc::PHIEliminationPass>(Pipeline, rcc::riscv::ssaInfo());
if (!Added)
return std::unexpected(Added.error());
}
if (!Function.properties().has(rcc::MachineFunctionProperty::TiedOpsRewritten)) {
auto Added = addPass<rcc::TwoAddressRewritePass>(Pipeline, rcc::riscv::ssaInfo());
if (!Added)
return std::unexpected(Added.error());
}
if (!Function.properties().has(rcc::MachineFunctionProperty::NoVRegs)) {
auto Added = rcc::addPreRegisterAllocationOptimizationPipeline(Pipeline, TargetInfo);
if (!Added)
return std::unexpected(Added.error());
Added = addPass<rcc::PBQPAllocatorPass>(Pipeline, rcc::riscv::registerAllocationInfo());
if (!Added)
return std::unexpected(Added.error());
}
if (!Function.properties().has(rcc::MachineFunctionProperty::NoExecutablePseudos)) {
auto Added = rcc::addPostRegisterAllocationPipeline(Pipeline, TargetInfo);
if (!Added)
return std::unexpected(Added.error());
}
rcc::MachineAnalysisManager Analyses;
auto Registered = rcc::registerMachineOptimizationAnalyses(Analyses);
if (!Registered)
return std::unexpected(Registered.error());
return Pipeline.run(Function, Target, Analyses);
}
} // namespace
int main(int ArgumentCount, char *Arguments[]) {
CommandLine Command;
if (!parseCommandLine(ArgumentCount, Arguments, Command))
return 1;
std::string SourceText;
if (!readInput(Command, SourceText))
return 1;
auto Target = rcc::riscv::createTargetDescription();
if (!Target) {
std::cerr << "rcc-backend-asm: cannot create RV64GC target: " << Target.error().message()
<< '\n';
return 1;
}
rcc::mir::MIRDocumentParserOptions Options;
Options.DataLayout = "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128";
Options.DefaultPointerSizeInBits = 64;
auto Parsed =
rcc::mir::parseMIRDocument(*Target, Command.InputPath, std::move(SourceText), Options);
if (!Parsed.succeeded()) {
for (const rcc::TextDiagnostic &Diagnostic : Parsed.diagnostics())
std::cerr << rcc::formatTextDiagnostic(Diagnostic, Parsed.source()) << '\n';
return 1;
}
rcc::CompilationUnit &Unit = Parsed.document()->unit();
for (std::size_t Index = 0; Index < Unit.functionCount(); ++Index) {
rcc::MachineFunction *Function = Unit.functionAt(Index);
if (Function == nullptr) {
std::cerr << "rcc-backend-asm: parsed document contains a null function\n";
return 1;
}
auto Run = runBackendPipeline(*Function, *Target);
if (!Run) {
std::cerr << "rcc-backend-asm: backend pipeline failed for '" << Function->name()
<< "': " << Run.error().message() << '\n';
return 1;
}
}
auto Assembly = rcc::riscv::emitAssembly(Unit, *Target);
if (!Assembly) {
std::cerr << "rcc-backend-asm: assembly emission failed: " << Assembly.error().message()
<< '\n';
return 1;
}
std::cout << *Assembly;
return 0;
}
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