[clang] [clang] solve crash due to function overloading. (PR #90255)
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Fri Apr 26 12:39:54 PDT 2024
https://github.com/lolloz98 created https://github.com/llvm/llvm-project/pull/90255
Closes #88917
I am a newby in llvm development.
I followed the suggestion for solving the issue. I added just a simple test to verify that the compilation does not crash.
Should the test not be good enough or any problems are found, please let me know, eager to learn :)
>From 0d473873057b094c8cf112f7075c4a578e54a4f5 Mon Sep 17 00:00:00 2001
From: lolloz98 <lorenzocarpaneto at yahoo.it>
Date: Fri, 26 Apr 2024 20:31:32 +0100
Subject: [PATCH] [clang] solve crash due to function overloading.
---
clang/lib/CodeGen/CodeGenModule.cpp | 16 ++++++++++++----
clang/test/CodeGen/function_overload_crash.c | 7 +++++++
2 files changed, 19 insertions(+), 4 deletions(-)
create mode 100644 clang/test/CodeGen/function_overload_crash.c
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 0c447b20cef40d..bed5669861392d 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -5702,13 +5702,16 @@ CodeGenModule::getLLVMLinkageVarDefinition(const VarDecl *VD) {
static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
llvm::Function *newFn) {
// Fast path.
- if (old->use_empty()) return;
+ if (old->use_empty())
+ return;
llvm::Type *newRetTy = newFn->getReturnType();
- SmallVector<llvm::Value*, 4> newArgs;
+ SmallVector<llvm::Value *, 4> newArgs;
+
+ SmallVector<llvm::CallBase *> callSitesToBeRemovedFromParent;
for (llvm::Value::use_iterator ui = old->use_begin(), ue = old->use_end();
- ui != ue; ) {
+ ui != ue;) {
llvm::Value::use_iterator use = ui++; // Increment before the use is erased.
llvm::User *user = use->getUser();
@@ -5722,7 +5725,8 @@ static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
// Recognize calls to the function.
llvm::CallBase *callSite = dyn_cast<llvm::CallBase>(user);
- if (!callSite) continue;
+ if (!callSite)
+ continue;
if (!callSite->isCallee(&*use))
continue;
@@ -5792,6 +5796,10 @@ static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
if (callSite->getDebugLoc())
newCall->setDebugLoc(callSite->getDebugLoc());
+ callSitesToBeRemovedFromParent.push_back(callSite);
+ }
+
+ for (auto *callSite : callSitesToBeRemovedFromParent) {
callSite->eraseFromParent();
}
}
diff --git a/clang/test/CodeGen/function_overload_crash.c b/clang/test/CodeGen/function_overload_crash.c
new file mode 100644
index 00000000000000..094b56030d7ae0
--- /dev/null
+++ b/clang/test/CodeGen/function_overload_crash.c
@@ -0,0 +1,7 @@
+// RUN: %clang_cc1 -emit-llvm < %s
+
+int b();
+int main() { return b(b); }
+int b(int (*f)()){
+ return 0;
+}
\ No newline at end of file
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