[llvm] llvm-c: Introduce 'LLVMDISubprogramReplaceType' (PR #143461)

[via llvm-commits]

https://github.com/davidgmbb created https://github.com/llvm/llvm-project/pull/143461

The C API does not provide a way to replace the subroutine type after creating a subprogram. This functionality is useful for creating a subroutine type composed of types which have the subprogram as scope

>From 9150b7ef61e01ff33c86d607b26912da1da54e19 Mon Sep 17 00:00:00 2001
From: David Gonzalez Martin <davidgmbb at gmail.com>
Date: Mon, 9 Jun 2025 18:09:24 -0600
Subject: [PATCH] llvm-c: Introduce 'LLVMDISubprogramReplaceType'

The C API does not provide a way to replace the subroutine type after
creating a subprogram. This functionality is useful for creating a
subroutine type composed of types which have the subprogram as scope
---
 llvm/include/llvm-c/DebugInfo.h | 9 +++++++++
 llvm/lib/IR/DebugInfo.cpp       | 4 ++++
 2 files changed, 13 insertions(+)

diff --git a/llvm/include/llvm-c/DebugInfo.h b/llvm/include/llvm-c/DebugInfo.h
index 991def64028da..bffed4bebbda6 100644
--- a/llvm/include/llvm-c/DebugInfo.h
+++ b/llvm/include/llvm-c/DebugInfo.h
@@ -1420,6 +1420,15 @@ void LLVMSetSubprogram(LLVMValueRef Func, LLVMMetadataRef SP);
  */
 unsigned LLVMDISubprogramGetLine(LLVMMetadataRef Subprogram);
 
+/**
+ * Replace the subprogram subroutine type
+ * \param Subprogram        The subprogram object.
+ * \param SubroutineType    The new subroutine type
+ *
+ * @see DISubprogram::replaceType()
+ */
+void LLVMDISubprogramReplaceType(LLVMMetadataRef Subprogram, LLVMMetadataRef SubroutineType);
+
 /**
  * Get the debug location for the given instruction.
  *
diff --git a/llvm/lib/IR/DebugInfo.cpp b/llvm/lib/IR/DebugInfo.cpp
index 7db9891fdbd75..c26dfcde87edf 100644
--- a/llvm/lib/IR/DebugInfo.cpp
+++ b/llvm/lib/IR/DebugInfo.cpp
@@ -1818,6 +1818,10 @@ unsigned LLVMDISubprogramGetLine(LLVMMetadataRef Subprogram) {
   return unwrapDI<DISubprogram>(Subprogram)->getLine();
 }
 
+void LLVMDISubprogramReplaceType(LLVMMetadataRef Subprogram, LLVMMetadataRef SubroutineType) {
+  unwrapDI<DISubprogram>(Subprogram)->replaceType(unwrapDI<DISubroutineType>(SubroutineType));
+}
+
 LLVMMetadataRef LLVMInstructionGetDebugLoc(LLVMValueRef Inst) {
   return wrap(unwrap<Instruction>(Inst)->getDebugLoc().getAsMDNode());
 }