[WebAssembly] Add llvm-objdump support for wasm file format

This is the first part of an effort to add wasm binary
support across all llvm tools.

Patch by Sam Clegg

Differential Revision: https://reviews.llvm.org/D26172

llvm-svn: 288251

4 files changed, 32 insertions, 0 deletions

diff --git a/llvm/tools/llvm-objdump/CMakeLists.txt b/llvm/tools/llvm-objdump/CMakeLists.txt
index f1239a280ce..27e6145dfc1 100644
--- a/llvm/tools/llvm-objdump/CMakeLists.txt
+++ b/llvm/tools/llvm-objdump/CMakeLists.txt
@@ -19,6 +19,7 @@ add_llvm_tool(llvm-objdump
   COFFDump.cpp
   ELFDump.cpp
   MachODump.cpp
+  WasmDump.cpp
   )
 
 if(HAVE_LIBXAR)
diff --git a/llvm/tools/llvm-objdump/WasmDump.cpp b/llvm/tools/llvm-objdump/WasmDump.cpp
new file mode 100644
index 00000000000..0d8ffba6ba4
--- /dev/null
+++ b/llvm/tools/llvm-objdump/WasmDump.cpp
@@ -0,0 +1,28 @@
+//===-- WasmDump.cpp - wasm-specific dumper ---------------------*- 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 implements the wasm-specific dumper for llvm-objdump.
+///
+//===----------------------------------------------------------------------===//
+
+#include "llvm-objdump.h"
+#include "llvm/Object/Wasm.h"
+
+using namespace llvm;
+using namespace object;
+
+void llvm::printWasmFileHeader(const object::ObjectFile *Obj) {
+  const WasmObjectFile *File = dyn_cast<const WasmObjectFile>(Obj);
+
+  outs() << "Program Header:\n";
+  outs() << "Version: 0x";
+  outs().write_hex(File->getHeader().Version);
+  outs() << "\n";
+}
diff --git a/llvm/tools/llvm-objdump/llvm-objdump.cpp b/llvm/tools/llvm-objdump/llvm-objdump.cpp
index cbb74a3abd2..319d8afcc0b 100644
--- a/llvm/tools/llvm-objdump/llvm-objdump.cpp
+++ b/llvm/tools/llvm-objdump/llvm-objdump.cpp
@@ -1910,6 +1910,8 @@ static void printPrivateFileHeaders(const ObjectFile *o, bool onlyFirst) {
     return printELFFileHeader(o);
   if (o->isCOFF())
     return printCOFFFileHeader(o);
+  if (o->isWasm())
+    return printWasmFileHeader(o);
   if (o->isMachO()) {
     printMachOFileHeader(o);
     if (!onlyFirst)
diff --git a/llvm/tools/llvm-objdump/llvm-objdump.h b/llvm/tools/llvm-objdump/llvm-objdump.h
index c87ef2deb22..dace82af3d0 100644
--- a/llvm/tools/llvm-objdump/llvm-objdump.h
+++ b/llvm/tools/llvm-objdump/llvm-objdump.h
@@ -79,6 +79,7 @@ void printCOFFSymbolTable(const object::COFFImportFile *i);
 void printCOFFSymbolTable(const object::COFFObjectFile *o);
 void printMachOFileHeader(const object::ObjectFile *o);
 void printMachOLoadCommands(const object::ObjectFile *o);
+void printWasmFileHeader(const object::ObjectFile *o);
 void printExportsTrie(const object::ObjectFile *o);
 void printRebaseTable(const object::ObjectFile *o);
 void printBindTable(const object::ObjectFile *o);