[yaml2obj] Add "-o" command line option to specify an output file name.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208900 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 31 insertions, 11 deletions

diff --git a/tools/yaml2obj/yaml2elf.cpp b/tools/yaml2obj/yaml2elf.cpp
index 1d2beda713..3190b27d32 100644
--- a/tools/yaml2obj/yaml2elf.cpp
+++ b/tools/yaml2obj/yaml2elf.cpp
@@ -477,13 +477,13 @@ int yaml2elf(llvm::raw_ostream &Out, llvm::MemoryBuffer *Buf) {
   typedef ELFType<support::big, 4, false> BE32;
   if (is64Bit(Doc)) {
     if (isLittleEndian(Doc))
-      return ELFState<LE64>::writeELF(outs(), Doc);
+      return ELFState<LE64>::writeELF(Out, Doc);
     else
-      return ELFState<BE64>::writeELF(outs(), Doc);
+      return ELFState<BE64>::writeELF(Out, Doc);
   } else {
     if (isLittleEndian(Doc))
-      return ELFState<LE32>::writeELF(outs(), Doc);
+      return ELFState<LE32>::writeELF(Out, Doc);
     else
-      return ELFState<BE32>::writeELF(outs(), Doc);
+      return ELFState<BE32>::writeELF(Out, Doc);
   }
 }
diff --git a/tools/yaml2obj/yaml2obj.cpp b/tools/yaml2obj/yaml2obj.cpp
index cc0fecc3c6..2493b48699 100644
--- a/tools/yaml2obj/yaml2obj.cpp
+++ b/tools/yaml2obj/yaml2obj.cpp
@@ -16,12 +16,14 @@
 
 #include "yaml2obj.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FileSystem.h"
 #include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/PrettyStackTrace.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/system_error.h"
+#include "llvm/Support/ToolOutputFile.h"
 
 using namespace llvm;
 
@@ -49,6 +51,8 @@ cl::opt<YAMLObjectFormat> Format(
     clEnumValN(YOF_ELF, "elf", "ELF object file format"),
   clEnumValEnd));
 
+static cl::opt<std::string> OutputFilename("o", cl::desc("Output filename"),
+                                           cl::value_desc("filename"));
 
 int main(int argc, char **argv) {
   cl::ParseCommandLineOptions(argc, argv);
@@ -56,15 +60,31 @@ int main(int argc, char **argv) {
   PrettyStackTraceProgram X(argc, argv);
   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
 
+  if (OutputFilename.empty())
+    OutputFilename = "-";
+
+  std::string ErrorInfo;
+  std::unique_ptr<tool_output_file> Out(
+      new tool_output_file(OutputFilename.c_str(), ErrorInfo, sys::fs::F_None));
+  if (!ErrorInfo.empty()) {
+    errs() << ErrorInfo << '\n';
+    return 1;
+  }
+
   std::unique_ptr<MemoryBuffer> Buf;
   if (MemoryBuffer::getFileOrSTDIN(Input, Buf))
     return 1;
-  if (Format == YOF_COFF) {
-    return yaml2coff(outs(), Buf.get());
-  } else if (Format == YOF_ELF) {
-    return yaml2elf(outs(), Buf.get());
-  } else {
+
+  int Res = 1;
+  if (Format == YOF_COFF)
+    Res = yaml2coff(Out->os(), Buf.get());
+  else if (Format == YOF_ELF)
+    Res = yaml2elf(Out->os(), Buf.get());
+  else
     errs() << "Not yet implemented\n";
-    return 1;
-  }
+
+  if (Res == 0)
+    Out->keep();
+
+  return Res;
 }