Augment the C API

[pitrou]

Summary

Add a couple simple wrappers to the C API, for the benefit of non-C++ projects.
This represents some of the functionality we expose in the llvmlite Python binding.

[eliben]

lgtm

[echristo]

I'm sorry, I'd prefer we not accept this patch today. I'm not a fan of the existing code generation options to LTO and don't want to encompass this sort of thing as top level C API right now.

The symbol patches seem somewhat more reasonable as API and I'm ok with that.

Thanks!

-eric

[pitrou]

Here is a new patch without the optimization settings APIs.

[echristo]

Seems reasonable.

-eric

[eliben]

Do you have commit rights, Antoine?

llvm/trunk/include/llvm-c/Support.h

  * cannot rely on any particular set of command line arguments being interpreted
  * the same way across LLVM versions.
  *
  * @see llvm::cl::ParseCommandLineOptions()
  */
 void LLVMParseCommandLineOptions(int argc, const char *const *argv,
                                  const char *Overview);
 
+/**
+ * This function will search through all previously loaded dynamic
+ * libraries for the symbol \p symbolName. If it is found, the address of
+ * that symbol is returned. If not, null is returned.
+ *
+ * @see sys::DynamicLibrary::SearchForAddressOfSymbol()
+ */
+void *LLVMSearchForAddressOfSymbol(const char *symbolName);
+
+/**
+ * This functions permanently adds the symbol \p symbolName with the
+ * value \p symbolValue.  These symbols are searched before any
+ * libraries.
+ *
+ * @see sys::DynamicLibrary::AddSymbol()
+ */
+void LLVMAddSymbol(const char *symbolName, void *symbolValue);
+
 #ifdef __cplusplus
 }
 #endif
 
 #endif

llvm/trunk/lib/Support/DynamicLibrary.cpp

 
 //===----------------------------------------------------------------------===//
 // C API.
 //===----------------------------------------------------------------------===//
 
 LLVMBool LLVMLoadLibraryPermanently(const char* Filename) {
   return llvm::sys::DynamicLibrary::LoadLibraryPermanently(Filename);
 }
+
+void *LLVMSearchForAddressOfSymbol(const char *symbolName) {
+  return llvm::sys::DynamicLibrary::SearchForAddressOfSymbol(symbolName);
+}
+
+void LLVMAddSymbol(const char *symbolName, void *symbolValue) {
+  return llvm::sys::DynamicLibrary::AddSymbol(symbolName, symbolValue);
+}
+