+void LLVMInitializeMCJITCompilerOptions(LLVMMCJITCompilerOptions *PassedOptions,
+ size_t SizeOfPassedOptions) {
+ LLVMMCJITCompilerOptions options;
+ options.OptLevel = 0;
+ options.CodeModel = LLVMCodeModelJITDefault;
+ options.NoFramePointerElim = false;
+ options.EnableFastISel = false;
+
+ memcpy(PassedOptions, &options,
+ std::min(sizeof(options), SizeOfPassedOptions));
+}
+
+LLVMBool LLVMCreateMCJITCompilerForModule(
+ LLVMExecutionEngineRef *OutJIT, LLVMModuleRef M,
+ LLVMMCJITCompilerOptions *PassedOptions, size_t SizeOfPassedOptions,
+ char **OutError) {
+ LLVMMCJITCompilerOptions options;
+ // If the user passed a larger sized options struct, then they were compiled
+ // against a newer LLVM. Tell them that something is wrong.
+ if (SizeOfPassedOptions > sizeof(options)) {
+ *OutError = strdup(
+ "Refusing to use options struct that is larger than my own; assuming "
+ "LLVM library mismatch.");
+ return 1;
+ }
+
+ // Defend against the user having an old version of the API by ensuring that
+ // any fields they didn't see are cleared. We must defend against fields being
+ // set to the bitwise equivalent of zero, and assume that this means "do the
+ // default" as if that option hadn't been available.
+ LLVMInitializeMCJITCompilerOptions(&options, sizeof(options));
+ memcpy(&options, PassedOptions, SizeOfPassedOptions);
+
+ TargetOptions targetOptions;
+ targetOptions.NoFramePointerElim = options.NoFramePointerElim;
+ targetOptions.EnableFastISel = options.EnableFastISel;
+
+ std::string Error;
+ EngineBuilder builder(unwrap(M));
+ builder.setEngineKind(EngineKind::JIT)
+ .setErrorStr(&Error)
+ .setUseMCJIT(true)
+ .setOptLevel((CodeGenOpt::Level)options.OptLevel)
+ .setCodeModel(unwrap(options.CodeModel))
+ .setTargetOptions(targetOptions);
+ if (ExecutionEngine *JIT = builder.create()) {
+ *OutJIT = wrap(JIT);
+ return 0;
+ }
+ *OutError = strdup(Error.c_str());
+ return 1;
+}
+