[llvm] [LLVM][NewPM] Add C API for running the pipeline on a single function. (PR #103773)

[Nikita Popov via llvm-commits]

================
@@ -48,15 +48,24 @@ static TargetMachine *unwrap(LLVMTargetMachineRef P) {
 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LLVMPassBuilderOptions,
                                    LLVMPassBuilderOptionsRef)
 
-LLVMErrorRef LLVMRunPasses(LLVMModuleRef M, const char *Passes,
-                           LLVMTargetMachineRef TM,
-                           LLVMPassBuilderOptionsRef Options) {
+LLVMErrorRef RunPasses(LLVMModuleRef M, LLVMValueRef F, const char *Passes,
+                       LLVMTargetMachineRef TM,
+                       LLVMPassBuilderOptionsRef Options) {
   TargetMachine *Machine = unwrap(TM);
   LLVMPassBuilderOptions *PassOpts = unwrap(Options);
   bool Debug = PassOpts->DebugLogging;
   bool VerifyEach = PassOpts->VerifyEach;
 
-  Module *Mod = unwrap(M);
+  // Determine what to run passes on.
+  Module *Mod;
+  Function *Fun = nullptr;
+  if (F) {
+    Fun = unwrap<Function>(F);
+    Mod = Fun->getParent();
+  } else {
+    Mod = unwrap(M);
+  }
----------------
nikic wrote:

I think this code should go into the caller.

https://github.com/llvm/llvm-project/pull/103773