From b353bb302faaf3d2e6ed5cae2241d5512b75178d Mon Sep 17 00:00:00 2001
From: Aidan Hall <ahall28@apple.com>
Date: Fri, 31 Oct 2025 13:47:22 +0000
Subject: [PATCH] DebugUtils: Remove eraseFromParentWithDebugInsts

There is another near-identical function in DebugOptUtils.h that can be used
everywhere this function is used, and offers more flexibility in its callback
interface.
---
 include/swift/SIL/DebugUtils.h              | 39 ---------------------
 lib/SILOptimizer/Transforms/CSE.cpp         |  2 +-
 lib/SILOptimizer/Transforms/SimplifyCFG.cpp |  2 +-
 3 files changed, 2 insertions(+), 41 deletions(-)

diff --git a/include/swift/SIL/DebugUtils.h b/include/swift/SIL/DebugUtils.h
index 0b8c6aa46a678..afe74d4fd333e 100644
--- a/include/swift/SIL/DebugUtils.h
+++ b/include/swift/SIL/DebugUtils.h
@@ -204,45 +204,6 @@ inline Operand *getAnyDebugUse(SILValue value) {
   return *ii;
 }
 
-/// Erases the instruction \p I from it's parent block and deletes it, including
-/// all debug instructions which use \p I.
-/// Precondition: The instruction may only have debug instructions as uses.
-/// If the iterator \p InstIter references any deleted instruction, it is
-/// incremented.
-///
-/// \p callBack will be invoked before each instruction is deleted. \p callBack
-/// is not responsible for deleting the instruction because this utility
-/// unconditionally deletes the \p I and its debug users.
-///
-/// Returns an iterator to the next non-deleted instruction after \p I.
-inline SILBasicBlock::iterator eraseFromParentWithDebugInsts(
-    SILInstruction *I, llvm::function_ref<void(SILInstruction *)> callBack =
-                           [](SILInstruction *) {}) {
-
-  auto nextII = std::next(I->getIterator());
-
-  auto results = I->getResults();
-
-  bool foundAny;
-  do {
-    foundAny = false;
-    for (auto result : results) {
-      while (!result->use_empty()) {
-        foundAny = true;
-        auto *User = result->use_begin()->getUser();
-        assert(User->isDebugInstruction());
-        if (nextII == User->getIterator())
-          nextII++;
-        callBack(User);
-        User->eraseFromParent();
-      }
-    }
-  } while (foundAny);
-
-  I->eraseFromParent();
-  return nextII;
-}
-
 /// Return true if the def-use graph rooted at \p V contains any non-debug,
 /// non-trivial users.
 bool hasNonTrivialNonDebugTransitiveUsers(
diff --git a/lib/SILOptimizer/Transforms/CSE.cpp b/lib/SILOptimizer/Transforms/CSE.cpp
index 2139509343826..b4205971e8c54 100644
--- a/lib/SILOptimizer/Transforms/CSE.cpp
+++ b/lib/SILOptimizer/Transforms/CSE.cpp
@@ -17,7 +17,6 @@
 
 #define DEBUG_TYPE "sil-cse"
 #include "swift/Basic/Assertions.h"
-#include "swift/SIL/DebugUtils.h"
 #include "swift/SIL/Dominance.h"
 #include "swift/SIL/InstructionUtils.h"
 #include "swift/SIL/NodeBits.h"
@@ -34,6 +33,7 @@
 #include "swift/SILOptimizer/PassManager/Passes.h"
 #include "swift/SILOptimizer/PassManager/Transforms.h"
 #include "swift/SILOptimizer/Utils/BasicBlockOptUtils.h"
+#include "swift/SILOptimizer/Utils/DebugOptUtils.h"
 #include "swift/SILOptimizer/Utils/InstOptUtils.h"
 #include "swift/SILOptimizer/Utils/OwnershipOptUtils.h"
 #include "swift/SILOptimizer/Utils/SILInliner.h"
diff --git a/lib/SILOptimizer/Transforms/SimplifyCFG.cpp b/lib/SILOptimizer/Transforms/SimplifyCFG.cpp
index 98b5c0d87849b..accd78ee75fb8 100644
--- a/lib/SILOptimizer/Transforms/SimplifyCFG.cpp
+++ b/lib/SILOptimizer/Transforms/SimplifyCFG.cpp
@@ -34,7 +34,6 @@
 #include "swift/AST/Module.h"
 #include "swift/Basic/Assertions.h"
 #include "swift/SIL/BasicBlockDatastructures.h"
-#include "swift/SIL/DebugUtils.h"
 #include "swift/SIL/Dominance.h"
 #include "swift/SIL/InstructionUtils.h"
 #include "swift/SIL/Projection.h"
@@ -52,6 +51,7 @@
 #include "swift/SILOptimizer/Utils/BasicBlockOptUtils.h"
 #include "swift/SILOptimizer/Utils/CFGOptUtils.h"
 #include "swift/SILOptimizer/Utils/CastOptimizer.h"
+#include "swift/SILOptimizer/Utils/DebugOptUtils.h"
 #include "swift/SILOptimizer/Utils/InstOptUtils.h"
 #include "swift/SILOptimizer/Utils/OwnershipOptUtils.h"
 #include "swift/SILOptimizer/Utils/SILInliner.h"