[ORC] Add an OrcV2 C API function for configuring TargetMachines.

llvm/include/llvm-c/Orc.h

@@ -28,6 +28,7 @@
 #define LLVM_C_ORC_H
 
 #include "llvm-c/Error.h"
+#include "llvm-c/TargetMachine.h"
 #include "llvm-c/Types.h"
 
 LLVM_C_EXTERN_C_BEGIN
@@ -202,6 +203,17 @@ void LLVMOrcDisposeThreadSafeModule(LLVMOrcThreadSafeModuleRef TSM);
 LLVMErrorRef LLVMOrcJITTargetMachineBuilderDetectHost(
     LLVMOrcJITTargetMachineBuilderRef *Result);
 
+/**
+ * Create a JITTargetMachineBuilder from the given TargetMachine template.
+ *
+ * This operation takes ownership of the given TargetMachine and destroys it
+ * before returing. The resulting JITTargetMachineBuilder is owned by the client
+ * and must be passed to a consuming operation (e.g. LLVMOrcCreateLLJITBuilder)
+ * or disposed of by calling LLVMOrcDisposeJITTargetMachineBuilder.
+ */
+LLVMOrcJITTargetMachineBuilderRef
+LLVMOrcJITTargetMachineBuilderCreateFromTargetMachine(LLVMTargetMachineRef TM);
+
 /**
  * Dispose of a JITTargetMachineBuilder.
  */

llvm/lib/ExecutionEngine/Orc/OrcV2CBindings.cpp

@@ -56,6 +56,8 @@ DEFINE_SIMPLE_CONVERSION_FUNCTIONS(JITTargetMachineBuilder,
 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LLJITBuilder, LLVMOrcLLJITBuilderRef)
 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LLJIT, LLVMOrcLLJITRef)
 
+DEFINE_SIMPLE_CONVERSION_FUNCTIONS(TargetMachine, LLVMTargetMachineRef)
+
 LLVMOrcSymbolStringPoolEntryRef
 LLVMOrcExecutionSessionIntern(LLVMOrcExecutionSessionRef ES, const char *Name) {
   return wrap(
@@ -140,6 +142,26 @@ LLVMErrorRef LLVMOrcJITTargetMachineBuilderDetectHost(
   return LLVMErrorSuccess;
 }
 
+LLVMOrcJITTargetMachineBuilderRef
+LLVMOrcJITTargetMachineBuilderFromTargetMachine(LLVMTargetMachineRef TM) {
+  auto *TemplateTM = unwrap(TM);
+
+  auto JTMB =
+      std::make_unique<JITTargetMachineBuilder>(TemplateTM->getTargetTriple());
+
+  (*JTMB)
+      .setCPU(TemplateTM->getTargetCPU().str())
+      .setRelocationModel(TemplateTM->getRelocationModel())
+      .setCodeModel(TemplateTM->getCodeModel())
+      .setCodeGenOptLevel(TemplateTM->getOptLevel())
+      .setFeatures(TemplateTM->getTargetFeatureString())
+      .setOptions(TemplateTM->Options);
+
+  LLVMDisposeTargetMachine(TM);
+
+  return wrap(JTMB.release());
+}
+
 void LLVMOrcDisposeJITTargetMachineBuilder(
     LLVMOrcJITTargetMachineBuilderRef JTMB) {
   delete unwrap(JTMB);