1 files changed, 70 insertions, 0 deletions
diff --git a/backend/lib/MIR/MIRMetadataTextParser.h b/backend/lib/MIR/MIRMetadataTextParser.h
new file mode 100644
index 0000000..b8ebb12
--- /dev/null
+++ b/backend/lib/MIR/MIRMetadataTextParser.h
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+// NOLINTNEXTLINE(llvm-header-guard)
+#ifndef RCC_LIB_MIR_MIRMETADATATEXTPARSER_H
+#define RCC_LIB_MIR_MIRMETADATATEXTPARSER_H
+
+#include "rcc/CodeGen/MachineDebugInfo.h"
+#include "rcc/CodeGen/MachineMetadata.h"
+#include "rcc/MIR/MILexer.h"
+#include "rcc/Support/Error.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <functional>
+#include <optional>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
+
+namespace rcc::mir {
+
+class MetadataTextParser final {
+public:
+  using Resolver = std::function<Expected<MachineMetadataReference>(std::uint32_t Slot)>;
+
+  MetadataTextParser(std::string Text, Resolver Resolve)
+      : Lexer("MIR metadata scalar", std::move(Text)), Resolve(std::move(Resolve)) {
+    do {
+      Tokens.push_back(Lexer.next());
+    } while (!Tokens.back().isErrorOrEnd());
+  }
+
+  [[nodiscard]] Expected<MachineMetadataReference> parseReferenceOnly();
+  [[nodiscard]] Expected<MachineMetadataValue> parseValue();
+  [[nodiscard]] Expected<MachineDebugLocation> parseLocation();
+
+private:
+  [[nodiscard]] const MIToken &token() const noexcept {
+    return Tokens[Position];
+  }
+  [[nodiscard]] bool at(MITokenKind Kind) const noexcept {
+    return token().is(Kind);
+  }
+  void advance() noexcept {
+    if (Position + 1U < Tokens.size())
+      ++Position;
+  }
+  [[nodiscard]] bool consume(MITokenKind Kind) noexcept {
+    if (!at(Kind))
+      return false;
+    advance();
+    return true;
+  }
+  [[nodiscard]] Expected<void> expect(MITokenKind Kind, std::string_view Description);
+  [[nodiscard]] Expected<void> finish();
+  [[nodiscard]] Expected<MachineMetadataReference> parseReference();
+  [[nodiscard]] Expected<MachineDIExpression> parseExpression();
+  [[nodiscard]] Expected<void> parseDILocation(std::vector<MachineDILocationFrame> &Frames,
+                                               std::optional<MachineMetadataReference> &Terminal);
+
+  MILexer Lexer;
+  Resolver Resolve;
+  std::vector<MIToken> Tokens;
+  std::size_t Position = 0;
+};
+
+} // namespace rcc::mir
+
+#endif // RCC_LIB_MIR_MIRMETADATATEXTPARSER_H