https://github.com/ostannard created
https://github.com/llvm/llvm-project/pull/114217
The CodeGen for __builtin_assume_aligned assumes that the first argument is a
pointer, so crashes if the int-conversion error is downgraded or disabled. Emit
a non-downgradable error if the argument is not a pointer, like we currently do
for __builtin_launder.
Fixes #110914.
>From a657d11051c95473727ca5e9f6a8e8ab195fe590 Mon Sep 17 00:00:00 2001
From: Oliver Stannard <oliver.stann...@arm.com>
Date: Wed, 30 Oct 2024 12:01:56 +0000
Subject: [PATCH] [Clang] Fix crash in __builtin_assume_aligned
The CodeGen for __builtin_assume_aligned assumes that the first argument
is a pointer, so crashes if the int-conversion error is downgraded or
disabled. Emit a non-downgradable error if the argument is not a
pointer, like we currently do for __builtin_launder.
Fixes #110914.
---
clang/include/clang/Basic/DiagnosticSemaKinds.td | 2 ++
clang/lib/Sema/SemaChecking.cpp | 5 ++++-
clang/test/Sema/builtin-assume-aligned.c | 2 +-
3 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td
b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index 34ff49d7238a7f..67ef5fcae142c2 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -12271,6 +12271,8 @@ def warn_noderef_to_dereferenceable_pointer : Warning<
def err_builtin_launder_invalid_arg : Error<
"%select{non-pointer|function pointer|void pointer}0 argument to "
"'__builtin_launder' is not allowed">;
+def err_builtin_assume_aligned_invalid_arg : Error<
+ "non-pointer argument to '__builtin_assume_aligned' is not allowed">;
def err_builtin_is_within_lifetime_invalid_arg : Error<
"%select{non-|function }0pointer argument to '__builtin_is_within_lifetime' "
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index 3308b898a5b68f..f6f67895973cc7 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -5272,8 +5272,11 @@ bool Sema::BuiltinAssumeAligned(CallExpr *TheCall) {
{
ExprResult FirstArgResult =
DefaultFunctionArrayLvalueConversion(FirstArg);
- if (checkBuiltinArgument(*this, TheCall, 0))
+ if (!FirstArgResult.get()->getType()->isPointerType()) {
+ Diag(TheCall->getBeginLoc(),
diag::err_builtin_assume_aligned_invalid_arg)
+ << TheCall->getSourceRange();
return true;
+ }
/// In-place updation of FirstArg by checkBuiltinArgument is ignored.
TheCall->setArg(0, FirstArgResult.get());
}
diff --git a/clang/test/Sema/builtin-assume-aligned.c
b/clang/test/Sema/builtin-assume-aligned.c
index 33e85578451529..57378a3426524a 100644
--- a/clang/test/Sema/builtin-assume-aligned.c
+++ b/clang/test/Sema/builtin-assume-aligned.c
@@ -74,7 +74,7 @@ int test13(int *a) {
}
int test14(int *a, int b) {
- a = (int *)__builtin_assume_aligned(b, 32); // expected-error {{incompatible
integer to pointer conversion passing 'int' to parameter of type 'const void *}}
+ a = (int *)__builtin_assume_aligned(b, 32); // expected-error {{non-pointer
argument to '__builtin_assume_aligned' is not allowed}}
}
int test15(int *b) {
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