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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rcc/CodeGen/CommandFlags.h"
#include <optional>
#include <string>
#include <utility>
namespace rcc {
namespace {
[[nodiscard]] Expected<std::optional<std::string_view>>
takeValue(std::span<const std::string_view> Arguments, std::size_t &Index, std::string_view Name) {
const std::string_view Argument = Arguments[Index];
const std::string LongName =
Name.starts_with('-') && !Name.starts_with("--") ? "-" + std::string(Name) : std::string();
if (Argument == Name || (!LongName.empty() && Argument == LongName)) {
if (Index + 1U >= Arguments.size()) {
return makeUnexpected(ErrorCode::InvalidInvocation,
"missing value for command-line option '" + std::string(Name) + "'");
}
return Arguments[++Index];
}
std::string Prefix(Name);
Prefix.push_back('=');
if (Argument.starts_with(Prefix))
return Argument.substr(Prefix.size());
if (!LongName.empty()) {
std::string LongPrefix(LongName);
LongPrefix.push_back('=');
if (Argument.starts_with(LongPrefix))
return Argument.substr(LongPrefix.size());
}
return std::nullopt;
}
template <typename ValueT, typename ParserT>
[[nodiscard]] Expected<bool> parseValueFlag(std::span<const std::string_view> Arguments,
std::size_t &Index, std::string_view Name,
std::optional<ValueT> &Destination, ParserT Parser) {
auto Value = takeValue(Arguments, Index, Name);
if (!Value)
return std::unexpected(Value.error());
if (!*Value)
return false;
auto Parsed = Parser(**Value);
if (!Parsed)
return std::unexpected(Parsed.error());
Destination = std::move(*Parsed);
return true;
}
} // namespace
std::string_view spelling(RelocationModel Value) noexcept {
switch (Value) {
case RelocationModel::Static:
return "static";
case RelocationModel::PositionIndependent:
return "pic";
}
return "invalid";
}
std::string_view spelling(CodeModel Value) noexcept {
switch (Value) {
case CodeModel::Small:
return "small";
case CodeModel::Medium:
return "medium";
case CodeModel::Large:
return "large";
}
return "invalid";
}
std::string_view spelling(OptimizationLevel Value) noexcept {
switch (Value) {
case OptimizationLevel::O0:
return "O0";
case OptimizationLevel::O1:
return "O1";
case OptimizationLevel::O2:
return "O2";
case OptimizationLevel::O3:
return "O3";
case OptimizationLevel::Os:
return "Os";
case OptimizationLevel::Oz:
return "Oz";
}
return "invalid";
}
std::string_view spelling(CodeGenFileType Value) noexcept {
switch (Value) {
case CodeGenFileType::AssemblyFile:
return "asm";
case CodeGenFileType::ObjectFile:
return "obj";
case CodeGenFileType::Null:
return "null";
}
return "invalid";
}
Expected<RelocationModel> parseRelocationModel(std::string_view Value) {
if (Value == "static")
return RelocationModel::Static;
if (Value == "pic")
return RelocationModel::PositionIndependent;
return makeUnexpected(ErrorCode::InvalidInvocation, "unknown relocation model");
}
Expected<CodeModel> parseCodeModel(std::string_view Value) {
if (Value == "small")
return CodeModel::Small;
if (Value == "medium")
return CodeModel::Medium;
if (Value == "large")
return CodeModel::Large;
return makeUnexpected(ErrorCode::InvalidInvocation, "unknown code model");
}
Expected<OptimizationLevel> parseOptimizationLevel(std::string_view Value) {
if (Value == "O0")
return OptimizationLevel::O0;
if (Value == "O1")
return OptimizationLevel::O1;
if (Value == "O2")
return OptimizationLevel::O2;
if (Value == "O3")
return OptimizationLevel::O3;
if (Value == "Os")
return OptimizationLevel::Os;
if (Value == "Oz")
return OptimizationLevel::Oz;
return makeUnexpected(ErrorCode::InvalidInvocation, "unknown optimization level");
}
Expected<CodeGenFileType> parseCodeGenFileType(std::string_view Value) {
if (Value == "asm")
return CodeGenFileType::AssemblyFile;
if (Value == "obj")
return CodeGenFileType::ObjectFile;
if (Value == "null")
return CodeGenFileType::Null;
return makeUnexpected(ErrorCode::InvalidInvocation, "unknown file type");
}
Expected<bool> parseCodeGenCommandFlag(std::span<const std::string_view> Arguments,
std::size_t &Index, CodeGenCommandFlags &Flags) {
const std::string_view Argument = Arguments[Index];
const std::string_view Optimization = Argument.starts_with("--") ? Argument.substr(2)
: Argument.starts_with('-') ? Argument.substr(1)
: std::string_view{};
if ((Argument.starts_with('-') && !Argument.starts_with("---")) &&
(Optimization == "O0" || Optimization == "O1" || Optimization == "O2" ||
Optimization == "O3" || Optimization == "Os" || Optimization == "Oz")) {
auto Level = parseOptimizationLevel(Optimization);
if (!Level)
return std::unexpected(Level.error());
Flags.Optimization = *Level;
return true;
}
const auto ParseString = [&](std::string_view Name,
std::optional<std::string> &Destination) -> Expected<bool> {
auto Value = takeValue(Arguments, Index, Name);
if (!Value)
return std::unexpected(Value.error());
if (!*Value)
return false;
Destination = std::string(**Value);
return true;
};
for (const auto &[Name, Destination] :
{std::pair{"-mtriple", &Flags.Triple}, std::pair{"-mcpu", &Flags.CPU},
std::pair{"-mtune", &Flags.TuneCPU}, std::pair{"-target-abi", &Flags.ABI}}) {
auto Parsed = ParseString(Name, *Destination);
if (!Parsed)
return std::unexpected(Parsed.error());
if (*Parsed)
return true;
}
auto Features = takeValue(Arguments, Index, "-mattr");
if (!Features)
return std::unexpected(Features.error());
if (*Features) {
std::size_t Begin = 0;
while (Begin <= (**Features).size()) {
const std::size_t Comma = (**Features).find(',', Begin);
const std::size_t End = Comma == std::string_view::npos ? (**Features).size() : Comma;
if (End == Begin) {
return makeUnexpected(ErrorCode::InvalidInvocation,
"target feature list contains an empty element");
}
Flags.FeatureOverrides.emplace_back((**Features).substr(Begin, End - Begin));
if (Comma == std::string_view::npos)
break;
Begin = Comma + 1U;
}
return true;
}
auto Relocation =
parseValueFlag(Arguments, Index, "-relocation-model", Flags.Relocation, parseRelocationModel);
if (!Relocation)
return std::unexpected(Relocation.error());
if (*Relocation)
return true;
auto Code = parseValueFlag(Arguments, Index, "-code-model", Flags.Code, parseCodeModel);
if (!Code)
return std::unexpected(Code.error());
if (*Code)
return true;
auto FileType = takeValue(Arguments, Index, "-filetype");
if (!FileType)
return std::unexpected(FileType.error());
if (*FileType) {
auto Parsed = parseCodeGenFileType(**FileType);
if (!Parsed)
return std::unexpected(Parsed.error());
Flags.FileType = *Parsed;
Flags.FileTypeWasSpecified = true;
return true;
}
return false;
}
} // namespace rcc
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