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// SPDX-License-Identifier: GPL-3.0-or-later
#include "TableGenBackends.h"
#include "rcc/Support/TextDiagnostic.h"
#include <cctype>
#include <filesystem>
#include <fstream>
#include <iostream>
#include <iterator>
#include <optional>
#include <string>
#include <string_view>
#include <unordered_map>
#include <vector>
namespace {
struct CommandLine final {
std::vector<std::string> InputPaths;
std::string RegisterHeaderPath;
std::string InstructionHeaderPath;
std::string TablesPath;
std::string GlobalISelPath;
};
[[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") {
if (Index + 1 >= ArgumentCount) {
std::cerr << "rcc-tblgen: missing value for " << Argument << '\n';
return false;
}
Result.InputPaths.emplace_back(Arguments[++Index]);
continue;
}
if (Argument == "--register-header" || Argument == "--instruction-header" ||
Argument == "--tables" || Argument == "--global-isel") {
if (Index + 1 >= ArgumentCount) {
std::cerr << "rcc-tblgen: missing value for " << Argument << '\n';
return false;
}
std::string *Destination = nullptr;
if (Argument == "--register-header")
Destination = &Result.RegisterHeaderPath;
else if (Argument == "--instruction-header")
Destination = &Result.InstructionHeaderPath;
else if (Argument == "--global-isel")
Destination = &Result.GlobalISelPath;
else
Destination = &Result.TablesPath;
*Destination = Arguments[++Index];
continue;
}
std::cerr << "rcc-tblgen: unknown argument '" << Argument << "'\n";
return false;
}
if (!Result.InputPaths.empty() && !Result.RegisterHeaderPath.empty() &&
!Result.InstructionHeaderPath.empty() && !Result.TablesPath.empty() &&
!Result.GlobalISelPath.empty()) {
return true;
}
std::cerr << "usage: rcc-tblgen --input <file> [--input <fragment>]... --register-header <file> "
"--instruction-header <file> --tables <file> --global-isel <file>\n";
return false;
}
[[nodiscard]] bool writeFile(const std::filesystem::path &Path, std::string_view Contents) {
std::error_code Error;
std::filesystem::create_directories(Path.parent_path(), Error);
if (Error) {
std::cerr << "rcc-tblgen: cannot create output directory for '" << Path.string()
<< "': " << Error.message() << '\n';
return false;
}
std::ofstream Output(Path, std::ios::binary | std::ios::trunc);
if (!Output) {
std::cerr << "rcc-tblgen: cannot open output '" << Path.string() << "'\n";
return false;
}
Output.write(Contents.data(), static_cast<std::streamsize>(Contents.size()));
if (Output) {
Output.close();
return true;
}
std::cerr << "rcc-tblgen: cannot write output '" << Path.string() << "'\n";
return false;
}
struct SourceSection final {
std::string Name;
std::string Contents;
std::size_t HeaderSize = 0;
};
[[nodiscard]] bool isIdentifierCharacter(char Character) noexcept {
return std::isalnum(static_cast<unsigned char>(Character)) != 0 || Character == '_';
}
[[nodiscard]] std::optional<std::string_view> topLevelKey(std::string_view Line) noexcept {
if (Line.empty() || Line.front() == '#' ||
(!std::isalpha(static_cast<unsigned char>(Line.front())) && Line.front() != '_')) {
return std::nullopt;
}
std::size_t End = 1;
while (End < Line.size() && isIdentifierCharacter(Line[End]))
++End;
if (End == Line.size() || Line[End] != ':')
return std::nullopt;
return Line.substr(0, End);
}
[[nodiscard]] std::vector<SourceSection> splitSections(std::string_view SourceText) {
std::vector<SourceSection> Result;
std::size_t SectionStart = 0;
std::size_t HeaderEnd = 0;
std::optional<std::string> SectionName;
std::size_t LineStart = 0;
while (LineStart < SourceText.size()) {
const std::size_t LineEnd = SourceText.find('\n', LineStart);
const std::size_t ContentEnd = LineEnd == std::string_view::npos ? SourceText.size() : LineEnd;
const std::string_view Line = SourceText.substr(LineStart, ContentEnd - LineStart);
if (const auto Key = topLevelKey(Line)) {
if (SectionName) {
Result.push_back({
.Name = std::move(*SectionName),
.Contents = std::string(SourceText.substr(SectionStart, LineStart - SectionStart)),
.HeaderSize = HeaderEnd - SectionStart,
});
}
SectionStart = LineStart;
HeaderEnd = LineEnd == std::string_view::npos ? SourceText.size() : LineEnd + 1U;
SectionName = std::string(*Key);
}
if (LineEnd == std::string_view::npos)
break;
LineStart = LineEnd + 1U;
}
if (SectionName) {
Result.push_back({
.Name = std::move(*SectionName),
.Contents = std::string(SourceText.substr(SectionStart)),
.HeaderSize = HeaderEnd - SectionStart,
});
}
return Result;
}
[[nodiscard]] std::optional<std::string>
combineDescriptionSources(const std::vector<std::string> &Paths,
const std::vector<std::string> &Sources) {
std::vector<SourceSection> Result;
std::unordered_map<std::string, std::size_t> SectionIndex;
for (std::size_t Index = 0; Index < Sources.size(); ++Index) {
const std::vector<SourceSection> Sections = splitSections(Sources[Index]);
if (Sections.empty()) {
std::cerr << "rcc-tblgen: input '" << Paths[Index]
<< "' does not contain a top-level description section\n";
return std::nullopt;
}
for (const SourceSection &Section : Sections) {
const auto Position = SectionIndex.find(Section.Name);
if (Position == SectionIndex.end()) {
SectionIndex.emplace(Section.Name, Result.size());
Result.push_back(Section);
continue;
}
if (Section.Name != "instructions" && Section.Name != "selection_rules") {
std::cerr << "rcc-tblgen: duplicate description section '" << Section.Name << "' in '"
<< Paths[Index] << "'\n";
return std::nullopt;
}
SourceSection &Existing = Result[Position->second];
const std::string_view Body(Section.Contents.data() + Section.HeaderSize,
Section.Contents.size() - Section.HeaderSize);
if (!Existing.Contents.empty() && Existing.Contents.back() != '\n')
Existing.Contents.push_back('\n');
Existing.Contents.append(Body);
}
}
std::string Combined;
for (const SourceSection &Section : Result) {
if (!Combined.empty() && Combined.back() != '\n')
Combined.push_back('\n');
Combined.append(Section.Contents);
}
return Combined;
}
} // namespace
int main(int ArgumentCount, char *Arguments[]) {
CommandLine Command;
if (!parseCommandLine(ArgumentCount, Arguments, Command))
return 1;
std::vector<std::string> Sources;
Sources.reserve(Command.InputPaths.size());
for (const std::string &InputPath : Command.InputPaths) {
std::ifstream Input(InputPath, std::ios::binary);
if (!Input) {
std::cerr << "rcc-tblgen: cannot open input '" << InputPath << "'\n";
return 1;
}
Sources.emplace_back(std::istreambuf_iterator<char>(Input), std::istreambuf_iterator<char>());
}
const auto SourceText = combineDescriptionSources(Command.InputPaths, Sources);
if (!SourceText)
return 1;
const rcc::targetgen::DescriptionGenerationResult Result =
rcc::targetgen::generateDescription(Command.InputPaths.front(), *SourceText);
if (!Result.succeeded()) {
const rcc::TextSource Source(Command.InputPaths.front(), *SourceText);
for (const rcc::TextDiagnostic &Diagnostic : Result.Diagnostics)
std::cerr << rcc::formatTextDiagnostic(Diagnostic, Source) << '\n';
return 1;
}
if (!Result.Output) {
std::cerr << "rcc-tblgen: successful generation produced no output\n";
return 1;
}
const rcc::targetgen::GeneratedDescription &Output = Result.Output.value();
return writeFile(Command.RegisterHeaderPath, Output.RegisterHeader) &&
writeFile(Command.InstructionHeaderPath, Output.InstructionHeader) &&
writeFile(Command.TablesPath, Output.TargetTables) &&
writeFile(Command.GlobalISelPath, Output.GlobalISel)
? 0
: 1;
}
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