[llvm-c] Improve TargetMachine bindings

Original patch by Chris Wailes

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194143 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm-c/TargetMachine.h

@@ -62,6 +62,16 @@ LLVMTargetRef LLVMGetFirstTarget(void);
 LLVMTargetRef LLVMGetNextTarget(LLVMTargetRef T);
 
 /*===-- Target ------------------------------------------------------------===*/
+/** Finds the target corresponding to the given name and stores it in \p T. 
+  Returns 0 on success. */
+LLVMBool LLVMGetTargetFromName(const char *Name, LLVMTargetRef *T);
+
+/** Finds the target corresponding to the given triple and stores it in \p T.
+  Returns 0 on success. Optionally returns any error in ErrorMessage.
+  Use LLVMDisposeMessage to dispose the message. */
+LLVMBool LLVMGetTargetFromTriple(const char* Triple, LLVMTargetRef *T,
+                                 char **ErrorMessage);
+
 /** Returns the name of a target. See llvm::Target::getName */
 const char *LLVMGetTargetName(LLVMTargetRef T);
 
@@ -108,6 +118,10 @@ char *LLVMGetTargetMachineFeatureString(LLVMTargetMachineRef T);
 /** Returns the llvm::DataLayout used for this llvm:TargetMachine. */
 LLVMTargetDataRef LLVMGetTargetMachineData(LLVMTargetMachineRef T);
 
+/** Set the target machine's ASM verbosity. */
+void LLVMSetTargetMachineAsmVerbosity(LLVMTargetMachineRef T,
+                                      LLVMBool VerboseAsm);
+
 /** Emits an asm or object file for the given module to the filename. This
   wraps several c++ only classes (among them a file stream). Returns any
   error in ErrorMessage. Use LLVMDisposeMessage to dispose the message. */
@@ -117,6 +131,12 @@ LLVMBool LLVMTargetMachineEmitToFile(LLVMTargetMachineRef T, LLVMModuleRef M,
 /** Compile the LLVM IR stored in \p M and store the result in \p OutMemBuf. */
 LLVMBool LLVMTargetMachineEmitToMemoryBuffer(LLVMTargetMachineRef T, LLVMModuleRef M,
   LLVMCodeGenFileType codegen, char** ErrorMessage, LLVMMemoryBufferRef *OutMemBuf);
+
+/*===-- Triple ------------------------------------------------------------===*/
+/** Get a triple for the host machine as a string. The result needs to be
+  disposed with LLVMDisposeMessage. */
+char* LLVMGetDefaultTargetTriple(void);
+
 #ifdef __cplusplus
 }
 #endif

lib/Target/TargetMachineC.cpp

@@ -21,6 +21,7 @@
 #include "llvm/Support/FormattedStream.h"
 #include "llvm/Support/TargetRegistry.h"
 #include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Target/TargetMachine.h"
 #include <cassert>
 #include <cstdlib>
@@ -71,6 +72,35 @@ LLVMTargetRef LLVMGetNextTarget(LLVMTargetRef T) {
   return wrap(unwrap(T)->getNext());
 }
 
+LLVMBool LLVMGetTargetFromName(const char *Name, LLVMTargetRef *T) {
+  for (TargetRegistry::iterator IT = TargetRegistry::begin(),
+                                IE = TargetRegistry::end(); IT != IE; ++IT) {
+    if (IT->getName() == Name) {
+      *T = wrap(&*IT);
+
+      return 0;
+    }
+  }
+  
+  return 1;
+}
+
+LLVMBool LLVMGetTargetFromTriple(const char* TripleStr, LLVMTargetRef *T,
+                                 char **ErrorMessage) {
+  std::string Error;
+  
+  *T = wrap(TargetRegistry::lookupTarget(TripleStr, Error));
+  
+  if (!*T) {
+    if (ErrorMessage)
+      *ErrorMessage = strdup(Error.c_str());
+
+    return 1;
+  }
+  
+  return 0;
+}
+
 const char * LLVMGetTargetName(LLVMTargetRef T) {
   return unwrap(T)->getName();
 }
@@ -162,6 +192,11 @@ LLVMTargetDataRef LLVMGetTargetMachineData(LLVMTargetMachineRef T) {
   return wrap(unwrap(T)->getDataLayout());
 }
 
+void LLVMSetTargetMachineAsmVerbosity(LLVMTargetMachineRef T,
+                                      LLVMBool VerboseAsm) {
+  unwrap(T)->setAsmVerbosityDefault(VerboseAsm);
+}
+
 static LLVMBool LLVMTargetMachineEmit(LLVMTargetMachineRef T, LLVMModuleRef M,
   formatted_raw_ostream &OS, LLVMCodeGenFileType codegen, char **ErrorMessage) {
   TargetMachine* TM = unwrap(T);
@@ -229,3 +264,7 @@ LLVMBool LLVMTargetMachineEmitToMemoryBuffer(LLVMTargetMachineRef T,
                                                      Data.length(), "");
   return Result;
 }
+
+char *LLVMGetDefaultTargetTriple(void) {
+  return strdup(sys::getDefaultTargetTriple().c_str());
+}