mirror of
https://src.fedoraproject.org/rpms/llvm.git
synced 2024-11-28 10:35:42 +00:00
103 lines
4.2 KiB
Diff
103 lines
4.2 KiB
Diff
From 97ab1917845fa9426ba913139fc8a007cba1d7ce Mon Sep 17 00:00:00 2001
|
|
From: Nikita Popov <npopov@redhat.com>
|
|
Date: Mon, 27 May 2024 08:54:11 +0200
|
|
Subject: [PATCH] [PPCMergeStringPool] Only replace constant once (#92996)
|
|
|
|
In #88846 I changed this code to use RAUW to perform the replacement
|
|
instead of manual updates -- but kept the outer loop, which means we try
|
|
to perform RAUW once per user. However, some of the users might be freed
|
|
by the RAUW operation, resulting in use-after-free.
|
|
|
|
The case where this happens is constant users where the replacement
|
|
might result in the destruction of the original constant.
|
|
|
|
Fixes https://github.com/llvm/llvm-project/issues/92991.
|
|
|
|
(cherry picked from commit 9f85bc834b07ebfec9e5e02deb9255a0f6ec5cc7)
|
|
---
|
|
.../lib/Target/PowerPC/PPCMergeStringPool.cpp | 37 ++++---------------
|
|
.../PowerPC/mergeable-string-pool-pr92991.ll | 20 ++++++++++
|
|
2 files changed, 27 insertions(+), 30 deletions(-)
|
|
create mode 100644 llvm/test/CodeGen/PowerPC/mergeable-string-pool-pr92991.ll
|
|
|
|
diff --git a/llvm/lib/Target/PowerPC/PPCMergeStringPool.cpp b/llvm/lib/Target/PowerPC/PPCMergeStringPool.cpp
|
|
index ebd876d50c44e..0830b02370cd0 100644
|
|
--- a/llvm/lib/Target/PowerPC/PPCMergeStringPool.cpp
|
|
+++ b/llvm/lib/Target/PowerPC/PPCMergeStringPool.cpp
|
|
@@ -290,13 +290,6 @@ bool PPCMergeStringPool::mergeModuleStringPool(Module &M) {
|
|
return true;
|
|
}
|
|
|
|
-static bool userHasOperand(User *TheUser, GlobalVariable *GVOperand) {
|
|
- for (Value *Op : TheUser->operands())
|
|
- if (Op == GVOperand)
|
|
- return true;
|
|
- return false;
|
|
-}
|
|
-
|
|
// For pooled strings we need to add the offset into the pool for each string.
|
|
// This is done by adding a Get Element Pointer (GEP) before each user. This
|
|
// function adds the GEP.
|
|
@@ -307,29 +300,13 @@ void PPCMergeStringPool::replaceUsesWithGEP(GlobalVariable *GlobalToReplace,
|
|
Indices.push_back(ConstantInt::get(Type::getInt32Ty(*Context), 0));
|
|
Indices.push_back(ConstantInt::get(Type::getInt32Ty(*Context), ElementIndex));
|
|
|
|
- // Need to save a temporary copy of each user list because we remove uses
|
|
- // as we replace them.
|
|
- SmallVector<User *> Users;
|
|
- for (User *CurrentUser : GlobalToReplace->users())
|
|
- Users.push_back(CurrentUser);
|
|
-
|
|
- for (User *CurrentUser : Users) {
|
|
- // The user was not found so it must have been replaced earlier.
|
|
- if (!userHasOperand(CurrentUser, GlobalToReplace))
|
|
- continue;
|
|
-
|
|
- // We cannot replace operands in globals so we ignore those.
|
|
- if (isa<GlobalValue>(CurrentUser))
|
|
- continue;
|
|
-
|
|
- Constant *ConstGEP = ConstantExpr::getInBoundsGetElementPtr(
|
|
- PooledStructType, GPool, Indices);
|
|
- LLVM_DEBUG(dbgs() << "Replacing this global:\n");
|
|
- LLVM_DEBUG(GlobalToReplace->dump());
|
|
- LLVM_DEBUG(dbgs() << "with this:\n");
|
|
- LLVM_DEBUG(ConstGEP->dump());
|
|
- GlobalToReplace->replaceAllUsesWith(ConstGEP);
|
|
- }
|
|
+ Constant *ConstGEP =
|
|
+ ConstantExpr::getInBoundsGetElementPtr(PooledStructType, GPool, Indices);
|
|
+ LLVM_DEBUG(dbgs() << "Replacing this global:\n");
|
|
+ LLVM_DEBUG(GlobalToReplace->dump());
|
|
+ LLVM_DEBUG(dbgs() << "with this:\n");
|
|
+ LLVM_DEBUG(ConstGEP->dump());
|
|
+ GlobalToReplace->replaceAllUsesWith(ConstGEP);
|
|
}
|
|
|
|
} // namespace
|
|
diff --git a/llvm/test/CodeGen/PowerPC/mergeable-string-pool-pr92991.ll b/llvm/test/CodeGen/PowerPC/mergeable-string-pool-pr92991.ll
|
|
new file mode 100644
|
|
index 0000000000000..4e9c69e5fe4cf
|
|
--- /dev/null
|
|
+++ b/llvm/test/CodeGen/PowerPC/mergeable-string-pool-pr92991.ll
|
|
@@ -0,0 +1,20 @@
|
|
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
|
|
+; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu < %s | FileCheck %s
|
|
+
|
|
+@g = private constant [4 x i32] [i32 122, i32 67, i32 35, i32 56]
|
|
+@g2 = private constant [1 x i64] [i64 1], align 8
|
|
+
|
|
+define void @test(ptr %p, ptr %p2) {
|
|
+; CHECK-LABEL: test:
|
|
+; CHECK: # %bb.0:
|
|
+; CHECK-NEXT: addis 5, 2, .L__ModuleStringPool@toc@ha
|
|
+; CHECK-NEXT: addi 5, 5, .L__ModuleStringPool@toc@l
|
|
+; CHECK-NEXT: addi 6, 5, 12
|
|
+; CHECK-NEXT: std 6, 0(3)
|
|
+; CHECK-NEXT: addi 3, 5, 16
|
|
+; CHECK-NEXT: std 3, 0(4)
|
|
+; CHECK-NEXT: blr
|
|
+ store ptr getelementptr inbounds ([4 x i32], ptr @g, i64 0, i64 1), ptr %p
|
|
+ store ptr getelementptr inbounds ([4 x i32], ptr @g, i64 0, i64 2), ptr %p2
|
|
+ ret void
|
|
+}
|