[WebAssembly] Introduce a WebAssemblyTargetStreamer class.

Refactor .param, .result, .local, and .endfunc, as directives, using the
proper MCTargetStreamer mechanism, rather than fake instructions.

llvm-svn: 257511

1 files changed, 67 insertions, 0 deletions

diff --git a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyTargetStreamer.h b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyTargetStreamer.h
new file mode 100644
index 00000000000..64334b45189
--- /dev/null
+++ b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyTargetStreamer.h
@@ -0,0 +1,67 @@
+//==-- WebAssemblyTargetStreamer.h - WebAssembly Target Streamer -*- C++ -*-==//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// \brief This file declares WebAssembly-specific target streamer classes.
+/// These are for implementing support for target-specific assembly directives.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_MCTARGETDESC_WEBASSEMBLYTARGETSTREAMER_H
+#define LLVM_LIB_TARGET_WEBASSEMBLY_MCTARGETDESC_WEBASSEMBLYTARGETSTREAMER_H
+
+#include "llvm/MC/MCStreamer.h"
+
+namespace llvm {
+
+class MCELFStreamer;
+
+/// WebAssembly-specific streamer interface, to implement support
+/// WebAssembly-specific assembly directives.
+class WebAssemblyTargetStreamer : public MCTargetStreamer {
+public:
+  explicit WebAssemblyTargetStreamer(MCStreamer &S);
+
+  /// .param
+  virtual void emitParam(ArrayRef<MVT> Types) = 0;
+  /// .result
+  virtual void emitResult(ArrayRef<MVT> Types) = 0;
+  /// .local
+  virtual void emitLocal(ArrayRef<MVT> Types) = 0;
+  /// .endfunc
+  virtual void emitEndFunc() = 0;
+};
+
+/// This part is for ascii assembly output
+class WebAssemblyTargetAsmStreamer final : public WebAssemblyTargetStreamer {
+  formatted_raw_ostream &OS;
+
+public:
+  WebAssemblyTargetAsmStreamer(MCStreamer &S, formatted_raw_ostream &OS);
+
+  void emitParam(ArrayRef<MVT> Types) override;
+  void emitResult(ArrayRef<MVT> Types) override;
+  void emitLocal(ArrayRef<MVT> Types) override;
+  void emitEndFunc() override;
+};
+
+/// This part is for ELF object output
+class WebAssemblyTargetELFStreamer final : public WebAssemblyTargetStreamer {
+public:
+  explicit WebAssemblyTargetELFStreamer(MCStreamer &S);
+
+  void emitParam(ArrayRef<MVT> Types) override;
+  void emitResult(ArrayRef<MVT> Types) override;
+  void emitLocal(ArrayRef<MVT> Types) override;
+  void emitEndFunc() override;
+};
+
+} // end namespace llvm
+
+#endif