From 444db30751380e8fe459bfeae4c5bb2a93c596eb Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Thu, 13 Aug 2026 13:10:47 +0800
Subject: [TableGen] Split the target description generator

---
 backend/utils/TableGen/rcc-tblgen.cpp | 110 ++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 backend/utils/TableGen/rcc-tblgen.cpp

(limited to 'backend/utils/TableGen/rcc-tblgen.cpp')

diff --git a/backend/utils/TableGen/rcc-tblgen.cpp b/backend/utils/TableGen/rcc-tblgen.cpp
new file mode 100644
index 0000000..3e4e093
--- /dev/null
+++ b/backend/utils/TableGen/rcc-tblgen.cpp
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "TableGenBackends.h"
+#include "rcc/Support/TextDiagnostic.h"
+
+#include <filesystem>
+#include <fstream>
+#include <iostream>
+#include <iterator>
+#include <string>
+#include <string_view>
+
+namespace {
+
+struct CommandLine final {
+  std::string InputPath;
+  std::string RegisterHeaderPath;
+  std::string InstructionHeaderPath;
+  std::string TablesPath;
+};
+
+[[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" || Argument == "--register-header" ||
+        Argument == "--instruction-header" || Argument == "--tables") {
+      if (Index + 1 >= ArgumentCount) {
+        std::cerr << "rcc-tblgen: missing value for " << Argument << '\n';
+        return false;
+      }
+      std::string *Destination = nullptr;
+      if (Argument == "--input")
+        Destination = &Result.InputPath;
+      else if (Argument == "--register-header")
+        Destination = &Result.RegisterHeaderPath;
+      else if (Argument == "--instruction-header")
+        Destination = &Result.InstructionHeaderPath;
+      else
+        Destination = &Result.TablesPath;
+      *Destination = Arguments[++Index];
+      continue;
+    }
+    std::cerr << "rcc-tblgen: unknown argument '" << Argument << "'\n";
+    return false;
+  }
+  if (!Result.InputPath.empty() && !Result.RegisterHeaderPath.empty() &&
+      !Result.InstructionHeaderPath.empty() && !Result.TablesPath.empty()) {
+    return true;
+  }
+  std::cerr << "usage: rcc-tblgen --input <file> --register-header <file> "
+               "--instruction-header <file> --tables <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;
+}
+
+} // namespace
+
+int main(int ArgumentCount, char *Arguments[]) {
+  CommandLine Command;
+  if (!parseCommandLine(ArgumentCount, Arguments, Command))
+    return 1;
+
+  std::ifstream Input(Command.InputPath, std::ios::binary);
+  if (!Input) {
+    std::cerr << "rcc-tblgen: cannot open input '" << Command.InputPath << "'\n";
+    return 1;
+  }
+  const std::string SourceText{std::istreambuf_iterator<char>(Input),
+                               std::istreambuf_iterator<char>()};
+  const rcc::targetgen::DescriptionGenerationResult Result =
+      rcc::targetgen::generateDescription(Command.InputPath, SourceText);
+  if (!Result.succeeded()) {
+    const rcc::TextSource Source(Command.InputPath, 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)
+             ? 0
+             : 1;
+}
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