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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rcc/Target/RISCV/RISCVFunctionInfo.h"
#include "rcc/CodeGen/TargetMIRTextInfo.h"
#include <bit>
#include <charconv>
#include <cstddef>
#include <cstdint>
#include <span>
#include <string>
#include <string_view>
#include <system_error>
#include <utility>
#include <vector>
namespace rcc::riscv {
namespace {
[[nodiscard]] Expected<std::int32_t> parseSignedField(const MIRTargetNode &Node,
std::string_view Name) {
if (Node.Kind != MIRTargetNodeKind::Scalar)
return makeUnexpected(ErrorCode::ParseError,
"RISC-V machineFunctionInfo field '" + std::string(Name) +
"' must be a scalar");
std::int32_t Value = 0;
const auto Result =
std::from_chars(Node.Scalar.data(), Node.Scalar.data() + Node.Scalar.size(), Value, 10);
if (Result.ec != std::errc{} || Result.ptr != Node.Scalar.data() + Node.Scalar.size()) {
return makeUnexpected(ErrorCode::ParseError,
"RISC-V machineFunctionInfo field '" + std::string(Name) +
"' must be a 32-bit signed integer");
}
return Value;
}
[[nodiscard]] Expected<TargetFunctionState> parseFunctionInfo(const MIRTargetNode &Node) {
if (Node.Kind != MIRTargetNodeKind::Mapping)
return makeUnexpected(ErrorCode::ParseError,
"RISC-V machineFunctionInfo must be a mapping");
std::int32_t VarArgsFrameIndex = 0;
std::int32_t VarArgsSaveSize = 0;
for (const MIRTargetMappingEntry &Entry : Node.Mapping) {
if (Entry.Key == "varArgsFrameIndex") {
auto Value = parseSignedField(Entry.Value, Entry.Key);
if (!Value)
return std::unexpected(Value.error());
VarArgsFrameIndex = *Value;
continue;
}
if (Entry.Key == "varArgsSaveSize") {
auto Value = parseSignedField(Entry.Value, Entry.Key);
if (!Value)
return std::unexpected(Value.error());
VarArgsSaveSize = *Value;
continue;
}
return makeUnexpected(ErrorCode::ParseError,
"unknown RISC-V machineFunctionInfo field '" + Entry.Key + "'");
}
return TargetFunctionState::create(
RISCVFunctionInfo(VarArgsFrameIndex, VarArgsSaveSize));
}
[[nodiscard]] Expected<MIRTargetNode>
printFunctionInfo(const TargetFunctionState &State) {
const auto *Info = State.getIf<RISCVFunctionInfo>();
if (Info == nullptr)
return makeUnexpected(ErrorCode::InvalidArgument,
"target function state is not RISC-V function information");
std::vector<MIRTargetMappingEntry> Entries;
Entries.push_back({"varArgsFrameIndex",
MIRTargetNode::scalar(std::to_string(Info->varArgsFrameIndex()))});
Entries.push_back({"varArgsSaveSize",
MIRTargetNode::scalar(std::to_string(Info->varArgsSaveSize()))});
return MIRTargetNode::mapping(std::move(Entries));
}
void appendWord(std::vector<std::byte> &Payload, std::int32_t Value) {
const std::uint32_t Bits = std::bit_cast<std::uint32_t>(Value);
for (std::uint32_t Shift = 0; Shift != 32; Shift += 8)
Payload.push_back(static_cast<std::byte>((Bits >> Shift) & 0xFFU));
}
[[nodiscard]] std::int32_t readWord(std::span<const std::byte> Payload,
std::size_t Offset) noexcept {
std::uint32_t Bits = 0;
for (std::uint32_t Byte = 0; Byte != 4; ++Byte) {
Bits |= std::to_integer<std::uint32_t>(Payload[Offset + Byte]) << (Byte * 8U);
}
return std::bit_cast<std::int32_t>(Bits);
}
} // namespace
Expected<void> RISCVFunctionInfo::verify() const {
return {};
}
Expected<RISCVFunctionInfo>
RISCVFunctionInfo::clone(const MachineFunctionCloneContext &) const {
return RISCVFunctionInfo(VarArgsFrameIndex, VarArgsSaveSize);
}
std::string RISCVFunctionInfo::print() const {
return "riscv-varargs:" + std::to_string(VarArgsFrameIndex) + ":" +
std::to_string(VarArgsSaveSize);
}
Expected<std::vector<std::byte>> RISCVFunctionInfo::encode() const {
std::vector<std::byte> Payload;
Payload.reserve(8);
appendWord(Payload, VarArgsFrameIndex);
appendWord(Payload, VarArgsSaveSize);
return Payload;
}
Expected<RISCVFunctionInfo>
RISCVFunctionInfo::decode(std::uint32_t Version, std::span<const std::byte> Payload) {
if (Version != schemaVersion())
return makeUnexpected(ErrorCode::ParseError,
"unsupported RISC-V function-info schema version");
if (Payload.size() != 8)
return makeUnexpected(ErrorCode::ParseError,
"RISC-V function-info payload must contain eight bytes");
return RISCVFunctionInfo(readWord(Payload, 0), readWord(Payload, 4));
}
void configureFunctionInfoMIRSchema(TargetMIRTextInfoDesc &Description) {
Description.FunctionStateType = RISCVFunctionInfo::stableTypeID();
Description.ParseFunctionState = parseFunctionInfo;
Description.PrintFunctionState = printFunctionInfo;
}
} // namespace rcc::riscv
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