[LIBCLC] Teach prepare-builtins how to handle text based IR (#66993)

libclc/utils/prepare-builtins.cpp

@@ -5,30 +5,37 @@
 #include "llvm/Bitcode/ReaderWriter.h"
 #endif
 
+#include "llvm/Config/llvm-config.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/GlobalVariable.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
+#include "llvm/IRReader/IRReader.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/FileSystem.h"
 #include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/FileSystem.h"
-#include "llvm/Support/raw_ostream.h"
-#include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/SourceMgr.h"
 #include "llvm/Support/ToolOutputFile.h"
-#include "llvm/Config/llvm-config.h"
+#include "llvm/Support/raw_ostream.h"
 
 #include <system_error>
 
 using namespace llvm;
 
+static ExitOnError ExitOnErr;
+
 static cl::opt<std::string>
 InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
 
 static cl::opt<std::string>
 OutputFilename("o", cl::desc("Output filename"),
                cl::value_desc("filename"));
 
+static cl::opt<bool> TextualOut("S", cl::desc("Emit LLVM textual assembly"),
+                                cl::init(false));
+
 int main(int argc, char **argv) {
   LLVMContext Context;
   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
@@ -45,17 +52,15 @@ int main(int argc, char **argv) {
       ErrorMessage = ec.message();
     } else {
       std::unique_ptr<MemoryBuffer> &BufferPtr = BufferOrErr.get();
-      ErrorOr<std::unique_ptr<Module>> ModuleOrErr =
+      SMDiagnostic Err;
+      std::unique_ptr<llvm::Module> MPtr =
 #if HAVE_LLVM > 0x0390
-          expectedToErrorOrAndEmitErrors(Context,
-          parseBitcodeFile(BufferPtr.get()->getMemBufferRef(), Context));
+          ExitOnErr(Expected<std::unique_ptr<llvm::Module>>(
+              parseIR(BufferPtr.get()->getMemBufferRef(), Err, Context)));
 #else
-          parseBitcodeFile(BufferPtr.get()->getMemBufferRef(), Context);
+          parseIR(BufferPtr.get()->getMemBufferRef(), Err, Context);
 #endif
-      if (std::error_code ec = ModuleOrErr.getError())
-        ErrorMessage = ec.message();
-
-      M = ModuleOrErr.get().release();
+      M = MPtr.release();
     }
   }
 
@@ -105,14 +110,16 @@ int main(int argc, char **argv) {
     exit(1);
   }
 
+  if (TextualOut)
+    M->print(Out->os(), nullptr, true);
+  else
 #if HAVE_LLVM >= 0x0700
-  WriteBitcodeToFile(*M, Out->os());
+    WriteBitcodeToFile(*M, Out->os());
 #else
-  WriteBitcodeToFile(M, Out->os());
+    WriteBitcodeToFile(M, Out->os());
 #endif
 
   // Declare success.
   Out->keep();
   return 0;
 }
-