Add DynamicLibrary support functions

Author: vchuravy

COVERAGE.md

@@ -1154,7 +1154,7 @@ ORC JIT
 Support
 -------
 
-- [ ] LLVMLoadLibraryPermanently
-- [ ] LLVMParseCommandLineOptions
-- [ ] LLVMSearchForAddressOfSymbol
-- [ ] LLVMAddSymbol
+- [x] LLVMLoadLibraryPermanently
+- [x] LLVMParseCommandLineOptions
+- [x] LLVMSearchForAddressOfSymbol
+- [x] LLVMAddSymbol

src/support.jl

@@ -4,3 +4,26 @@ function clopts(opts...)
     args = ["", opts...]
     API.LLVMParseCommandLineOptions(length(args), args, C_NULL)
 end
+
+"""
+    add_symbol(name, ptr)
+
+Permanently add the symbol `name` with the value `ptr`. These symbols are searched
+before any libraries.
+"""
+add_symbol(name, ptr) = LLVM.API.LLVMAddSymbol(name, ptr)
+
+"""
+    load_library_permantly(path)
+
+This function permanently loads the dynamic library at the given path.
+It is safe to call this function multiple times for the same library.
+"""
+load_library_permantly(path) = LLVM.API.LLVMLoadLibraryPermanently(path)
+
+"""
+    find_symbol(name)
+
+Search the global symbols for `name` and return the pointer to it.
+"""
+find_symbol(name) = LLVM.API.LLVMSearchForAddressOfSymbol(name)