[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, 94 insertions, 0 deletions

diff --git a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyTargetStreamer.cpp b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyTargetStreamer.cpp
new file mode 100644
index 0000000..1d28228
--- /dev/null
+++ b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyTargetStreamer.cpp
@@ -0,0 +1,94 @@
+//==-- WebAssemblyTargetStreamer.cpp - WebAssembly Target Streamer Methods --=//
+//
+//                     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 defines WebAssembly-specific target streamer classes.
+/// These are for implementing support for target-specific assembly directives.
+///
+//===----------------------------------------------------------------------===//
+
+#include "WebAssemblyTargetStreamer.h"
+#include "InstPrinter/WebAssemblyInstPrinter.h"
+#include "WebAssemblyMCTargetDesc.h"
+#include "WebAssemblyTargetObjectFile.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCSectionELF.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/MC/MCSymbolELF.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ELF.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
+using namespace llvm;
+
+WebAssemblyTargetStreamer::WebAssemblyTargetStreamer(MCStreamer &S)
+    : MCTargetStreamer(S) {}
+
+WebAssemblyTargetAsmStreamer::WebAssemblyTargetAsmStreamer(
+    MCStreamer &S, formatted_raw_ostream &OS)
+    : WebAssemblyTargetStreamer(S), OS(OS) {}
+
+WebAssemblyTargetELFStreamer::WebAssemblyTargetELFStreamer(MCStreamer &S)
+    : WebAssemblyTargetStreamer(S) {}
+
+static void PrintTypes(formatted_raw_ostream &OS, ArrayRef<MVT> Types) {
+  bool First = true;
+  for (MVT Type : Types) {
+    if (First)
+      First = false;
+    else
+      OS << ", ";
+    OS << WebAssembly::TypeToString(Type);
+  }
+  OS << '\n';
+}
+
+void WebAssemblyTargetAsmStreamer::emitParam(ArrayRef<MVT> Types) {
+  OS << "\t.param  \t";
+  PrintTypes(OS, Types);
+}
+
+void WebAssemblyTargetAsmStreamer::emitResult(ArrayRef<MVT> Types) {
+  OS << "\t.result \t";
+  PrintTypes(OS, Types);
+}
+
+void WebAssemblyTargetAsmStreamer::emitLocal(ArrayRef<MVT> Types) {
+  OS << "\t.local  \t";
+  PrintTypes(OS, Types);
+}
+
+void WebAssemblyTargetAsmStreamer::emitEndFunc() { OS << "\t.endfunc\n"; }
+
+// FIXME: What follows is not the real binary encoding.
+
+static void EncodeTypes(MCStreamer &Streamer, ArrayRef<MVT> Types) {
+  Streamer.EmitIntValue(Types.size(), sizeof(uint64_t));
+  for (MVT Type : Types)
+    Streamer.EmitIntValue(Type.SimpleTy, sizeof(uint64_t));
+}
+
+void WebAssemblyTargetELFStreamer::emitParam(ArrayRef<MVT> Types) {
+  Streamer.EmitIntValue(WebAssembly::DotParam, sizeof(uint64_t));
+  EncodeTypes(Streamer, Types);
+}
+
+void WebAssemblyTargetELFStreamer::emitResult(ArrayRef<MVT> Types) {
+  Streamer.EmitIntValue(WebAssembly::DotResult, sizeof(uint64_t));
+  EncodeTypes(Streamer, Types);
+}
+
+void WebAssemblyTargetELFStreamer::emitLocal(ArrayRef<MVT> Types) {
+  Streamer.EmitIntValue(WebAssembly::DotLocal, sizeof(uint64_t));
+  EncodeTypes(Streamer, Types);
+}
+
+void WebAssemblyTargetELFStreamer::emitEndFunc() {
+  Streamer.EmitIntValue(WebAssembly::DotEndFunc, sizeof(uint64_t));
+}