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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rcc/MC/TargetRegistry.h"
#include "rcc/Target/RISCV/RISCVAssemblyPrinter.h"
#include "rcc/Target/RISCV/RISCVObjectFile.h"
#include "rcc/Target/RISCV/RISCVPipeline.h"
#include "rcc/Target/RISCV/RISCVTarget.h"
#include "rcc/Target/TargetMachine.h"
#include <algorithm>
#include <array>
#include <memory>
#include <ranges>
#include <span>
#include <string>
#include <string_view>
#include <utility>
#include <vector>
namespace rcc {
namespace {
constexpr std::string_view RISCV64Triple = "riscv64-unknown-linux-gnu";
constexpr std::string_view RISCV64CPU = "generic-rv64gc";
constexpr std::string_view RISCV64DataLayout = "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128";
constexpr std::string_view RISCV64ABILoweringVersion = "rcc-rv64gc-lp64d-v1";
constexpr std::array<std::string_view, 1> RISCV64BaselineFeatures{"+i"};
[[nodiscard]] unsigned matchRISCV64Triple(std::string_view Triple) noexcept {
if (Triple == "riscv64" || Triple == "riscv64-linux-gnu" || Triple == RISCV64Triple)
return 20;
return Triple.starts_with("riscv64-") ? 10U : 0U;
}
[[nodiscard]] std::string normalizeRISCV64Triple(std::string_view Triple) {
if (Triple == "riscv64" || Triple == "riscv64-linux-gnu")
return std::string(RISCV64Triple);
return std::string(Triple);
}
[[nodiscard]] std::string defaultRISCV64ABI(std::span<const std::string> Features) {
return std::ranges::find(Features, "+d") == Features.end() ? "lp64" : "lp64d";
}
[[nodiscard]] TargetMachineOptions defaultRISCV64Options() {
return TargetMachineOptions{
.Triple = std::string(RISCV64Triple),
.CPU = std::string(RISCV64CPU),
.TuneCPU = std::string(RISCV64CPU),
.Features = {"+i", "+m", "+a", "+f", "+d", "+c", "+zicsr", "+zifencei"},
.ABI = "lp64d",
.DataLayout = std::string(RISCV64DataLayout),
.Relocation = RelocationModel::Static,
.Code = CodeModel::Small,
.Optimization = OptimizationLevel::O2,
.Options = {{"function-sections", "false"},
{"omit-frame-pointer", "true"},
{"stack-realignment", "false"}},
.ABILoweringVersion = std::string(RISCV64ABILoweringVersion),
.AssemblerFlavor = "rcc-integrated-gnu",
.AssemblerVersion = "rcc-mc-v1",
.AssemblerOptions = {{"relax", "true"}},
};
}
[[nodiscard]] bool booleanOption(std::span<const TargetOption> Options,
std::string_view Name) noexcept {
const auto Position = std::ranges::find(Options, Name, &TargetOption::Name);
return Position != Options.end() && Position->Value == "true";
}
class RISCVTargetMachine final : public TargetMachine {
public:
RISCVTargetMachine(const Target &RegisteredTarget, TargetMachineOptions Options,
TargetDescription Description, riscv::RISCVSubtargetFeatures Features,
RelocationModel Relocation, CodeModel Code, riscv::RISCVABI ABI)
: TargetMachine(RegisteredTarget, std::move(Options), std::move(Description)),
Subtarget(Features, Relocation, Code, ABI) {}
[[nodiscard]] Expected<void>
addCodeGenPasses(MachineFunctionPassManager &Pipeline, const MachineFunction &Function,
TargetPipelineOptions PipelineOptions) const override {
return riscv::addCanonicalPipeline(Pipeline, Function, Subtarget, PipelineOptions);
}
[[nodiscard]] Expected<std::unique_ptr<MachineFunctionPass>>
createMachinePass(std::string_view Name, TargetPipelineOptions PipelineOptions) const override {
return riscv::createCanonicalPipelinePass(Name, Subtarget, PipelineOptions);
}
[[nodiscard]] Expected<std::vector<std::string>>
codeGenPassNames(const MachineFunction &Function) const override {
return riscv::canonicalPipelinePassNames(Function, Subtarget);
}
[[nodiscard]] Expected<std::unique_ptr<TargetMachineOutlinerInfo>>
createOutlinerInfo() const override {
return riscv::createMachineOutlinerInfo(
booleanOption(options().Options, "function-sections"),
booleanOption(options().Options, "riscv-outliner-regsave"));
}
[[nodiscard]] Expected<std::string> emitAssembly(const CompilationUnit &Unit) const override {
return riscv::emitAssembly(Unit, targetDescription());
}
[[nodiscard]] Expected<std::vector<std::uint8_t>>
emitObject(const CompilationUnit &Unit) const override {
return riscv::emitObject(Unit, targetDescription());
}
private:
riscv::RISCVSubtarget Subtarget;
};
[[nodiscard]] Expected<std::unique_ptr<TargetMachine>>
createRISCVTargetMachine(const Target &RegisteredTarget, TargetMachineOptions Options) {
Options.Triple = RegisteredTarget.normalizeTriple(Options.Triple);
const TargetMachineOptions Defaults = defaultRISCV64Options();
if (Options.Triple != Defaults.Triple || Options.CPU != Defaults.CPU ||
Options.TuneCPU != Defaults.TuneCPU || Options.DataLayout != Defaults.DataLayout) {
return makeUnexpected(ErrorCode::InvalidInvocation,
"backend invocation does not select a supported RV64 target");
}
if (Options.ABILoweringVersion != RISCV64ABILoweringVersion) {
return makeUnexpected(ErrorCode::InvalidInvocation,
"RISC-V ABI lowering version does not match this build");
}
auto Features = riscv::RISCVSubtargetFeatures::fromFeatureList(Options.Features);
if (!Features)
return std::unexpected(Features.error());
auto ABI = riscv::parseRISCVABI(Options.ABI);
if (!ABI)
return std::unexpected(ABI.error());
if (*ABI == riscv::RISCVABI::LP64D && !Features->has(riscv::RISCVExtension::D)) {
return makeUnexpected(ErrorCode::InvalidInvocation, "RISC-V LP64D requires the D extension");
}
auto Description = riscv::createTargetDescription();
if (!Description)
return std::unexpected(Description.error());
const RelocationModel Relocation = Options.Relocation;
const CodeModel Code = Options.Code;
return std::make_unique<RISCVTargetMachine>(RegisteredTarget, std::move(Options),
std::move(*Description), *Features, Relocation, Code,
*ABI);
}
const Target &getRISCV64Target() {
static const Target RegisteredTarget(
"riscv64", "64-bit RISC-V", true, matchRISCV64Triple, normalizeRISCV64Triple,
defaultRISCV64Options, defaultRISCV64ABI, RISCV64BaselineFeatures, createRISCVTargetMachine);
return RegisteredTarget;
}
} // namespace
void initializeRISCVTarget() {
TargetRegistry::registerTarget(getRISCV64Target());
}
} // namespace rcc
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