From 379ff50dcc7ccf977379aee68fa9d10f69065d23 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Sun, 9 Aug 2026 18:31:49 +0800
Subject: [MC] Implement RV64GC assembly emission

---
 backend/include/rcc/MC/MCStreamer.h | 93 +++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 backend/include/rcc/MC/MCStreamer.h

(limited to 'backend/include/rcc/MC/MCStreamer.h')

diff --git a/backend/include/rcc/MC/MCStreamer.h b/backend/include/rcc/MC/MCStreamer.h
new file mode 100644
index 0000000..3add976
--- /dev/null
+++ b/backend/include/rcc/MC/MCStreamer.h
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_MC_MCSTREAMER_H
+#define RCC_MC_MCSTREAMER_H
+
+#include "rcc/MC/MCCFI.h"
+#include "rcc/MC/MCInst.h"
+#include "rcc/MC/MCInstPrinter.h"
+#include "rcc/MC/MCSection.h"
+#include "rcc/MC/MCSymbol.h"
+#include "rcc/Support/Error.h"
+
+#include <cstdint>
+#include <span>
+#include <string>
+#include <string_view>
+#include <unordered_set>
+
+namespace rcc::mc {
+
+enum class MCSymbolAttribute : std::uint8_t {
+  Global,
+  Weak,
+  Local,
+  Hidden,
+  Protected,
+  Function,
+  Object,
+  TLSObject,
+};
+
+class MCStreamer {
+public:
+  virtual ~MCStreamer() = default;
+
+  [[nodiscard]] virtual Expected<void> switchSection(MCSectionRef Section) = 0;
+  [[nodiscard]] virtual Expected<void> emitLabel(MCSymbolRef Symbol) = 0;
+  [[nodiscard]] virtual Expected<void> emitInstruction(const MCInst &Instruction) = 0;
+  [[nodiscard]] virtual Expected<void> emitValue(MCExprRef Value, std::uint8_t Size) = 0;
+  [[nodiscard]] virtual Expected<void> emitBytes(std::span<const std::uint8_t> Bytes) = 0;
+  [[nodiscard]] virtual Expected<void> emitZeroFill(std::uint64_t Size) = 0;
+  [[nodiscard]] virtual Expected<void> emitAlignment(std::uint64_t Alignment, std::uint8_t Fill = 0,
+                                                     std::uint64_t MaximumBytes = 0) = 0;
+  [[nodiscard]] virtual Expected<void> emitSymbolAttribute(MCSymbolRef Symbol,
+                                                           MCSymbolAttribute Attribute) = 0;
+  [[nodiscard]] virtual Expected<void> emitSymbolSize(MCSymbolRef Symbol, MCExprRef Size) = 0;
+  [[nodiscard]] virtual Expected<void> emitDirective(std::string_view Name,
+                                                     std::string_view Arguments = {}) = 0;
+  [[nodiscard]] virtual Expected<void> emitCFI(const MCCFIInstruction &Instruction) = 0;
+  [[nodiscard]] virtual Expected<void> emitInlineAssembly(std::string_view Text) = 0;
+  [[nodiscard]] virtual Expected<void> emitComment(std::string_view Text) = 0;
+  [[nodiscard]] virtual Expected<void> finish() = 0;
+};
+
+class AsmTextStreamer final : public MCStreamer {
+public:
+  explicit AsmTextStreamer(const MCInstPrinter &Printer) noexcept : Printer(&Printer) {}
+
+  [[nodiscard]] Expected<void> switchSection(MCSectionRef Section) override;
+  [[nodiscard]] Expected<void> emitLabel(MCSymbolRef Symbol) override;
+  [[nodiscard]] Expected<void> emitInstruction(const MCInst &Instruction) override;
+  [[nodiscard]] Expected<void> emitValue(MCExprRef Value, std::uint8_t Size) override;
+  [[nodiscard]] Expected<void> emitBytes(std::span<const std::uint8_t> Bytes) override;
+  [[nodiscard]] Expected<void> emitZeroFill(std::uint64_t Size) override;
+  [[nodiscard]] Expected<void> emitAlignment(std::uint64_t Alignment, std::uint8_t Fill = 0,
+                                             std::uint64_t MaximumBytes = 0) override;
+  [[nodiscard]] Expected<void> emitSymbolAttribute(MCSymbolRef Symbol,
+                                                   MCSymbolAttribute Attribute) override;
+  [[nodiscard]] Expected<void> emitSymbolSize(MCSymbolRef Symbol, MCExprRef Size) override;
+  [[nodiscard]] Expected<void> emitDirective(std::string_view Name,
+                                             std::string_view Arguments = {}) override;
+  [[nodiscard]] Expected<void> emitCFI(const MCCFIInstruction &Instruction) override;
+  [[nodiscard]] Expected<void> emitInlineAssembly(std::string_view Text) override;
+  [[nodiscard]] Expected<void> emitComment(std::string_view Text) override;
+  [[nodiscard]] Expected<void> finish() override;
+
+  [[nodiscard]] Expected<std::string> takeOutput();
+
+private:
+  [[nodiscard]] Expected<void> appendLine(std::string_view Prefix, std::string_view Text);
+  [[nodiscard]] Expected<void> requireActiveSection() const;
+
+  const MCInstPrinter *Printer;
+  MCSectionRef CurrentSection;
+  std::unordered_set<std::string> DefinedSymbols;
+  std::string Output;
+  bool IsFinished = false;
+  bool OutputWasTaken = false;
+};
+
+} // namespace rcc::mc
+
+#endif // RCC_MC_MCSTREAMER_H
-- 
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