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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rcc/Target/RISCV/RISCVObjectFile.h"
#include "RISCVAsmPrinter.h"
#include "RISCVTargetObjectFile.h"
#include "rcc/CodeGen/AsmPrinter.h"
#include "rcc/CodeGen/CompilationUnit.h"
#include "rcc/CodeGen/MachineFunction.h"
#include "rcc/CodeGen/MachineMCContext.h"
#include "rcc/IR/DataLayout.h"
#include "rcc/MC/ELFObjectWriter.h"
#include "rcc/MC/MCContext.h"
#include "rcc/MC/MCObjectStreamer.h"
#include "rcc/Target/RISCV/RISCVAsmBackend.h"
#include "rcc/Target/RISCV/RISCVMCCodeEmitter.h"
#include "rcc/Target/RISCV/RISCVMCTargetLowering.h"
#include "rcc/Target/RISCV/RISCVTarget.h"
#include <cstdint>
#include <utility>
#include <vector>
namespace rcc::riscv {
namespace {
constexpr std::uint16_t EMRISCV = 243;
constexpr std::uint32_t SHTRISCVAttributes = 0x70000003;
[[nodiscard]] AsmPrinterOptions printerOptions(ObjectEmissionOptions Options) noexcept {
return AsmPrinterOptions{
.EmitFunctionDirectives = Options.EmitFunctionDirectives,
.EmitCFI = Options.EmitCFI,
.EmitBlockLabels = Options.EmitBlockLabels,
.EmitInstructionSymbols = true,
.VerifyInput = Options.VerifyInput,
};
}
[[nodiscard]] std::vector<std::uint8_t> attributesSection() {
constexpr char Architecture[] = "rv64i2p1_m2p0_a2p1_f2p2_d2p2_c2p0_zicsr2p0_zifencei2p0_"
"zmmul1p0_zaamo1p0_zalrsc1p0";
const std::uint32_t FilePayloadSize = 1U + sizeof(Architecture) + 2U;
const std::uint32_t VendorSize = 4U + 6U + 1U + 4U + FilePayloadSize;
std::vector<std::uint8_t> Bytes;
Bytes.reserve(1U + VendorSize);
const auto AppendU32 = [&Bytes](std::uint32_t Value) {
for (std::uint8_t Shift = 0; Shift < 32; Shift += 8)
Bytes.push_back(static_cast<std::uint8_t>(Value >> Shift));
};
Bytes.push_back('A');
AppendU32(VendorSize);
Bytes.insert(Bytes.end(), {'r', 'i', 's', 'c', 'v', 0});
Bytes.push_back(1);
AppendU32(5U + FilePayloadSize);
Bytes.push_back(5);
Bytes.insert(Bytes.end(), Architecture, Architecture + sizeof(Architecture));
Bytes.push_back(4);
Bytes.push_back(16);
return Bytes;
}
[[nodiscard]] mc::ELFObjectTargetInfo objectTargetInfo() {
mc::ELFObjectTargetInfo Info;
Info.Machine = EMRISCV;
Info.ExtraSections.push_back(mc::ELFExtraSection{
.Name = ".riscv.attributes",
.Type = SHTRISCVAttributes,
.Flags = 0,
.Alignment = 1,
.EntrySize = 0,
.Contents = attributesSection(),
});
return Info;
}
struct ObjectEmissionContext final {
explicit ObjectEmissionContext(const TargetDescription &Target)
: MachineContext(Context), Lowering(Target), Emitter(Target), Writer(objectTargetInfo()),
Streamer(Emitter, Backend, Writer) {
mc::MCSectionDesc EHFrameDescription{
.Name = ".eh_frame",
.Kind = mc::MCSectionKind::EHFrame,
.Flags = {mc::MCSectionFlag::Alloc},
.Alignment = 8,
.EntrySize = 0,
.Group = {},
.UniqueID = std::nullopt,
};
auto EHFrame = Context.getOrCreateSection(std::move(EHFrameDescription));
if (!EHFrame) {
Initialization = std::unexpected(EHFrame.error());
return;
}
Initialization = Streamer.configureDwarfFrame(std::move(*EHFrame),
mc::MCDwarfFrameInfo{.CodeAlignment = 1,
.DataAlignment = -8,
.ReturnAddressRegister = 1,
.InitialCFARegister = 2,
.InitialCFAOffset = 0});
}
mc::MCContext Context;
MachineMCContext MachineContext;
RISCVMCTargetLowering Lowering;
RISCVELFTargetObjectFile ObjectFile;
RISCVMCCodeEmitter Emitter;
RISCVAsmBackend Backend;
mc::ELF64LEObjectWriter Writer;
mc::ELFObjectStreamer Streamer;
Expected<void> Initialization;
};
} // namespace
Expected<std::vector<std::uint8_t>> emitObject(const CompilationUnit &Unit,
const TargetDescription &Target,
ObjectEmissionOptions Options) {
ObjectEmissionContext Context(Target);
if (!Context.Initialization)
return std::unexpected(Context.Initialization.error());
auto Layout = DataLayout::parse(TargetDataLayout);
if (!Layout)
return std::unexpected(Layout.error());
RISCVAsmPrinter Printer(Target, Context.Lowering, Context.ObjectFile, std::move(*Layout),
Context.MachineContext, Context.Streamer, printerOptions(Options));
auto Emitted = Printer.emitCompilationUnit(Unit);
if (!Emitted)
return std::unexpected(Emitted.error());
return Context.Streamer.takeOutput();
}
Expected<std::vector<std::uint8_t>> emitObject(const MachineFunction &Function,
const TargetDescription &Target,
ObjectEmissionOptions Options) {
ObjectEmissionContext Context(Target);
if (!Context.Initialization)
return std::unexpected(Context.Initialization.error());
auto Layout = DataLayout::parse(TargetDataLayout);
if (!Layout)
return std::unexpected(Layout.error());
RISCVAsmPrinter Printer(Target, Context.Lowering, Context.ObjectFile, std::move(*Layout),
Context.MachineContext, Context.Streamer, printerOptions(Options));
auto Emitted = Printer.emitFunction(Function);
if (!Emitted)
return std::unexpected(Emitted.error());
return Context.Streamer.takeOutput();
}
} // namespace rcc::riscv
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