[WebAssembly] Add skeleton MC support for the Wasm container format
This just adds the basic skeleton for supporting a new object file format.
All of the actual encoding will be implemented in followup patches.
Differential Revision: https://reviews.llvm.org/D26722
llvm-svn: 295803
diff --git a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp
new file mode 100644
index 0000000..3fb3e65
--- /dev/null
+++ b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp
@@ -0,0 +1,48 @@
+//===-- WebAssemblyWasmObjectWriter.cpp - WebAssembly Wasm Writer ---------===//
+//
+// 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 handles Wasm-specific object emission, converting LLVM's
+/// internal fixups into the appropriate relocations.
+///
+//===----------------------------------------------------------------------===//
+
+#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
+#include "llvm/MC/MCFixup.h"
+#include "llvm/MC/MCWasmObjectWriter.h"
+#include "llvm/Support/ErrorHandling.h"
+using namespace llvm;
+
+namespace {
+class WebAssemblyWasmObjectWriter final : public MCWasmObjectTargetWriter {
+public:
+ explicit WebAssemblyWasmObjectWriter(bool Is64Bit);
+
+private:
+ unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
+ const MCFixup &Fixup, bool IsPCRel) const override;
+};
+} // end anonymous namespace
+
+WebAssemblyWasmObjectWriter::WebAssemblyWasmObjectWriter(bool Is64Bit)
+ : MCWasmObjectTargetWriter(Is64Bit) {}
+
+unsigned WebAssemblyWasmObjectWriter::getRelocType(MCContext &Ctx,
+ const MCValue &Target,
+ const MCFixup &Fixup,
+ bool IsPCRel) const {
+ llvm_unreachable("Relocations not yet implemented");
+ return 0;
+}
+
+MCObjectWriter *llvm::createWebAssemblyWasmObjectWriter(raw_pwrite_stream &OS,
+ bool Is64Bit) {
+ MCWasmObjectTargetWriter *MOTW = new WebAssemblyWasmObjectWriter(Is64Bit);
+ return createWasmObjectWriter(MOTW, OS);
+}