change addPassesToEmitFile to return true on failure instead of its input,

add -filetype=null for performance testing and remove -filetype=dynlib,
which isn't planned to be implemented.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95202 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 42 insertions, 54 deletions

diff --git a/include/llvm/Target/TargetMachine.h b/include/llvm/Target/TargetMachine.h
index af6591e..63e28ac 100644
--- a/include/llvm/Target/TargetMachine.h
+++ b/include/llvm/Target/TargetMachine.h
@@ -199,8 +199,7 @@ public:
   enum CodeGenFileType {
     CGFT_AssemblyFile,
     CGFT_ObjectFile,
-    CGFT_DynamicLibrary,
-    CGFT_ErrorOccurred
+    CGFT_Null         // Do not emit any output.
   };
 
   /// getEnableTailMergeDefault - the default setting for -enable-tail-merge
@@ -209,15 +208,13 @@ public:
 
   /// addPassesToEmitFile - Add passes to the specified pass manager to get the
   /// specified file emitted.  Typically this will involve several steps of code
-  /// generation.
-  /// This method should return InvalidFile if emission of this file type
-  /// is not supported.
-  ///
-  virtual CodeGenFileType addPassesToEmitFile(PassManagerBase &,
-                                              formatted_raw_ostream &,
-                                              CodeGenFileType Filetype,
-                                              CodeGenOpt::Level) {
-    return CGFT_ErrorOccurred;
+  /// generation.  This method should return true if emission of this file type
+  /// is not supported, or false on success.
+  virtual bool addPassesToEmitFile(PassManagerBase &,
+                                   formatted_raw_ostream &,
+                                   CodeGenFileType Filetype,
+                                   CodeGenOpt::Level) {
+    return true;
   }
 
   /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
@@ -264,18 +261,11 @@ public:
   /// addPassesToEmitFile - Add passes to the specified pass manager to get the
   /// specified file emitted.  Typically this will involve several steps of code
   /// generation.  If OptLevel is None, the code generator should emit code as
-  /// fast as possible, though the generated code may be less efficient.  This
-  /// method should return CGFT_ErrorOccurred if emission of this file type is
-  /// not supported.
-  ///
-  /// The default implementation of this method adds components from the
-  /// LLVM retargetable code generator, invoking the methods below to get
-  /// target-specific passes in standard locations.
-  ///
-  virtual CodeGenFileType addPassesToEmitFile(PassManagerBase &PM,
-                                              formatted_raw_ostream &Out,
-                                              CodeGenFileType FileType,
-                                              CodeGenOpt::Level);
+  /// fast as possible, though the generated code may be less efficient.
+  virtual bool addPassesToEmitFile(PassManagerBase &PM,
+                                   formatted_raw_ostream &Out,
+                                   CodeGenFileType FileType,
+                                   CodeGenOpt::Level);
   
   /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
   /// get machine code emitted.  This uses a JITCodeEmitter object to handle
diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp
index 2083c0a..c03e429 100644
--- a/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/lib/CodeGen/LLVMTargetMachine.cpp
@@ -111,21 +111,20 @@ LLVMTargetMachine::setCodeModelForStatic() {
   setCodeModel(CodeModel::Small);
 }
 
-TargetMachine::CodeGenFileType
-LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
-                                       formatted_raw_ostream &Out,
-                                       CodeGenFileType FileType,
-                                       CodeGenOpt::Level OptLevel) {
+bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
+                                            formatted_raw_ostream &Out,
+                                            CodeGenFileType FileType,
+                                            CodeGenOpt::Level OptLevel) {
   // Add common CodeGen passes.
   if (addCommonCodeGenPasses(PM, OptLevel))
-    return CGFT_ErrorOccurred;
+    return true;
 
   OwningPtr<MCContext> Context(new MCContext());
   OwningPtr<MCStreamer> AsmStreamer;
 
   formatted_raw_ostream *LegacyOutput;
   switch (FileType) {
-  default: return CGFT_ErrorOccurred;
+  default: return true;
   case CGFT_AssemblyFile: {
     const MCAsmInfo &MAI = *getMCAsmInfo();
     MCInstPrinter *InstPrinter =
@@ -143,7 +142,7 @@ LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
     // emission fails.
     MCCodeEmitter *MCE = getTarget().createCodeEmitter(*this);
     if (MCE == 0)
-      return CGFT_ErrorOccurred;
+      return true;
     
     AsmStreamer.reset(createMachOStreamer(*Context, Out, MCE));
     
@@ -154,6 +153,16 @@ LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
     LegacyOutput = new formatted_raw_ostream(errs());
     break;
   }
+  case CGFT_Null:
+    // The Null output is intended for use for performance analysis and testing,
+    // not real users.
+    AsmStreamer.reset(createNullStreamer(*Context));
+    // Any output to the asmprinter's "O" stream is bad and needs to be fixed,
+    // force it to come out stderr.
+    // FIXME: this is horrible and leaks, eventually remove the raw_ostream from
+    // asmprinter.
+    LegacyOutput = new formatted_raw_ostream(errs());
+    break;
   }
   
   // Create the AsmPrinter, which takes ownership of Context and AsmStreamer
@@ -162,7 +171,7 @@ LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
     getTarget().createAsmPrinter(*LegacyOutput, *this, *Context, *AsmStreamer,
                                  getMCAsmInfo());
   if (Printer == 0)
-    return CGFT_ErrorOccurred;
+    return true;
   
   // If successful, createAsmPrinter took ownership of AsmStreamer and Context.
   Context.take(); AsmStreamer.take();
@@ -172,7 +181,7 @@ LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
   // Make sure the code model is set.
   setCodeModelForStatic();
   PM.add(createGCInfoDeleter());
-  return FileType;
+  return false;
 }
 
 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
diff --git a/tools/llc/llc.cpp b/tools/llc/llc.cpp
index c7bd1c6..fe34bd1 100644
--- a/tools/llc/llc.cpp
+++ b/tools/llc/llc.cpp
@@ -91,9 +91,8 @@ FileType("filetype", cl::init(TargetMachine::CGFT_AssemblyFile),
                   "Emit an assembly ('.s') file"),
        clEnumValN(TargetMachine::CGFT_ObjectFile, "obj",
                   "Emit a native object ('.o') file [experimental]"),
-       clEnumValN(TargetMachine::CGFT_DynamicLibrary, "dynlib",
-                  "Emit a native dynamic library ('.so') file"
-                  " [experimental]"),
+       clEnumValN(TargetMachine::CGFT_Null, "null",
+                  "Emit nothing, for performance testing"),
        clEnumValEnd));
 
 cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
@@ -177,8 +176,8 @@ static formatted_raw_ostream *GetOutputStream(const char *TargetName,
     OutputFilename += ".o";
     Binary = true;
     break;
-  case TargetMachine::CGFT_DynamicLibrary:
-    OutputFilename += LTDL_SHLIB_EXT;
+  case TargetMachine::CGFT_Null:
+    OutputFilename += ".null";
     Binary = true;
     break;
   }
@@ -348,20 +347,13 @@ int main(int argc, char **argv) {
     // Override default to generate verbose assembly.
     Target.setAsmVerbosityDefault(true);
 
-    switch (Target.addPassesToEmitFile(Passes, *Out, FileType, OLvl)) {
-    default:
-      assert(0 && "Invalid file model!");
-      return 1;
-    case TargetMachine::CGFT_ErrorOccurred:
+    if (Target.addPassesToEmitFile(Passes, *Out, FileType, OLvl)) {
       errs() << argv[0] << ": target does not support generation of this"
              << " file type!\n";
       if (Out != &fouts()) delete Out;
       // And the Out file is empty and useless, so remove it now.
       sys::Path(OutputFilename).eraseFromDisk();
       return 1;
-    case TargetMachine::CGFT_AssemblyFile:
-    case TargetMachine::CGFT_ObjectFile:
-      break;
     }
 
     Passes.doInitialization();
diff --git a/tools/lto/LTOCodeGenerator.cpp b/tools/lto/LTOCodeGenerator.cpp
index 7e873ab..0a58aa7 100644
--- a/tools/lto/LTOCodeGenerator.cpp
+++ b/tools/lto/LTOCodeGenerator.cpp
@@ -393,14 +393,11 @@ bool LTOCodeGenerator::generateAssemblyCode(formatted_raw_ostream& out,
 
     codeGenPasses->add(new TargetData(*_target->getTargetData()));
 
-    switch (_target->addPassesToEmitFile(*codeGenPasses, out,
-                                         TargetMachine::CGFT_AssemblyFile,
-                                         CodeGenOpt::Aggressive)) {
-        case TargetMachine::CGFT_AssemblyFile:
-            break;
-        default:
-            errMsg = "target file type not supported";
-            return true;
+    if (_target->addPassesToEmitFile(*codeGenPasses, out,
+                                     TargetMachine::CGFT_AssemblyFile,
+                                     CodeGenOpt::Aggressive)) {
+      errMsg = "target file type not supported";
+      return true;
     }
 
     // Run our queue of passes all at once now, efficiently.