https://github.com/HendrikHuebner updated
https://github.com/llvm/llvm-project/pull/91057
From 9a0cb155e9d05043b31736080cb355ae73e16860 Mon Sep 17 00:00:00 2001
From: hhuebner <hendrik.huebne...@gmail.com>
Date: Sat, 4 May 2024 13:49:38 +0200
Subject: [PATCH] [Clang] Throw error when calling atomic with pointer to zero
size object
---
.../clang/Basic/DiagnosticSemaKinds.td | 4 ++-
clang/lib/Sema/SemaChecking.cpp | 18 ++++++++---
clang/test/Sema/atomic-ops.c | 32 +++++++++++++++++++
3 files changed, 48 insertions(+), 6 deletions(-)
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td
b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index fdca82934cb4d..83b9f008ad9a9 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -8803,8 +8803,10 @@ def err_builtin_fn_use : Error<"builtin functions must
be directly called">;
def warn_call_wrong_number_of_arguments : Warning<
"too %select{few|many}0 arguments in call to %1">;
+
def err_atomic_builtin_must_be_pointer : Error<
- "address argument to atomic builtin must be a pointer (%0 invalid)">;
+ "address argument to atomic builtin must be a pointer %select{|to a
non-zero-sized object }1(%0 invalid)">;
+
def err_atomic_builtin_must_be_pointer_intptr : Error<
"address argument to atomic builtin must be a pointer to integer or pointer"
" (%0 invalid)">;
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index e33113ab9c4c1..de69fb2a68c04 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -40,6 +40,7 @@
#include "clang/Basic/AddressSpaces.h"
#include "clang/Basic/CharInfo.h"
#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticFrontend.h"
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/LLVM.h"
#include "clang/Basic/LangOptions.h"
@@ -3807,7 +3808,7 @@ bool Sema::CheckARMBuiltinExclusiveCall(unsigned
BuiltinID, CallExpr *TheCall,
const PointerType *pointerType = PointerArg->getType()->getAs<PointerType>();
if (!pointerType) {
Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer)
- << PointerArg->getType() << PointerArg->getSourceRange();
+ << PointerArg->getType() << 0 << PointerArg->getSourceRange();
return true;
}
@@ -3841,7 +3842,7 @@ bool Sema::CheckARMBuiltinExclusiveCall(unsigned
BuiltinID, CallExpr *TheCall,
if (!ValType->isIntegerType() && !ValType->isAnyPointerType() &&
!ValType->isBlockPointerType() && !ValType->isFloatingType()) {
Diag(DRE->getBeginLoc(),
diag::err_atomic_builtin_must_be_pointer_intfltptr)
- << PointerArg->getType() << PointerArg->getSourceRange();
+ << PointerArg->getType() << 0 << PointerArg->getSourceRange();
return true;
}
@@ -8513,7 +8514,7 @@ ExprResult Sema::BuildAtomicExpr(SourceRange CallRange,
SourceRange ExprRange,
const PointerType *pointerType = Ptr->getType()->getAs<PointerType>();
if (!pointerType) {
Diag(ExprRange.getBegin(), diag::err_atomic_builtin_must_be_pointer)
- << Ptr->getType() << Ptr->getSourceRange();
+ << Ptr->getType() << 0 << Ptr->getSourceRange();
return ExprError();
}
@@ -8542,6 +8543,13 @@ ExprResult Sema::BuildAtomicExpr(SourceRange CallRange,
SourceRange ExprRange,
}
}
+ // Pointer to object of size zero is not allowed.
+ if (Context.getTypeInfoInChars(AtomTy).Width.isZero()) {
+ Diag(ExprRange.getBegin(), diag::err_atomic_builtin_must_be_pointer)
+ << Ptr->getType() << 1 << Ptr->getSourceRange();
+ return ExprError();
+ }
+
// For an arithmetic operation, the implied arithmetic must be well-formed.
if (Form == Arithmetic) {
// GCC does not enforce these rules for GNU atomics, but we do to help
catch
@@ -8933,7 +8941,7 @@ ExprResult Sema::BuiltinAtomicOverloaded(ExprResult
TheCallResult) {
const PointerType *pointerType = FirstArg->getType()->getAs<PointerType>();
if (!pointerType) {
Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer)
- << FirstArg->getType() << FirstArg->getSourceRange();
+ << FirstArg->getType() << 0 << FirstArg->getSourceRange();
return ExprError();
}
@@ -8941,7 +8949,7 @@ ExprResult Sema::BuiltinAtomicOverloaded(ExprResult
TheCallResult) {
if (!ValType->isIntegerType() && !ValType->isAnyPointerType() &&
!ValType->isBlockPointerType()) {
Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer_intptr)
- << FirstArg->getType() << FirstArg->getSourceRange();
+ << FirstArg->getType() << 0 << FirstArg->getSourceRange();
return ExprError();
}
diff --git a/clang/test/Sema/atomic-ops.c b/clang/test/Sema/atomic-ops.c
index 1d36667d6cf40..2024b81ce6aec 100644
--- a/clang/test/Sema/atomic-ops.c
+++ b/clang/test/Sema/atomic-ops.c
@@ -639,6 +639,38 @@ void memory_checks(_Atomic(int) *Ap, int *p, int val) {
(void)__atomic_compare_exchange_n(p, p, val, 0, memory_order_seq_cst, -1);
// expected-warning {{memory order argument to atomic operation is invalid}}
}
+struct Z {
+ char z[];
+};
+
+void zeroSizeArgError(struct Z *a, struct Z *b, struct Z *c) {
+ __atomic_exchange(b, b, c, memory_order_relaxed); // expected-error
{{address argument to atomic builtin must be a pointer to a non-zero-sized
object}}
+ __atomic_exchange(b, b, c, memory_order_acq_rel); // expected-error
{{address argument to atomic builtin must be a pointer to a non-zero-sized
object}}
+ __atomic_exchange(b, b, c, memory_order_acquire); // expected-error
{{address argument to atomic builtin must be a pointer to a non-zero-sized
object}}
+ __atomic_exchange(b, b, c, memory_order_consume); // expected-error
{{address argument to atomic builtin must be a pointer to a non-zero-sized
object}}
+ __atomic_exchange(b, b, c, memory_order_release); // expected-error
{{address argument to atomic builtin must be a pointer to a non-zero-sized
object}}
+ __atomic_exchange(b, b, c, memory_order_seq_cst); // expected-error
{{address argument to atomic builtin must be a pointer to a non-zero-sized
object}}
+ __atomic_load(a, b, memory_order_relaxed); // expected-error {{address
argument to atomic builtin must be a pointer to a non-zero-sized object}}
+ __atomic_load(a, b, memory_order_acq_rel); // expected-error {{address
argument to atomic builtin must be a pointer to a non-zero-sized object}}
+ __atomic_load(a, b, memory_order_acquire); // expected-error {{address
argument to atomic builtin must be a pointer to a non-zero-sized object}}
+ __atomic_load(a, b, memory_order_consume); // expected-error {{address
argument to atomic builtin must be a pointer to a non-zero-sized object}}
+ __atomic_load(a, b, memory_order_release); // expected-error {{address
argument to atomic builtin must be a pointer to a non-zero-sized object}}
+ __atomic_load(a, b, memory_order_seq_cst); // expected-error {{address
argument to atomic builtin must be a pointer to a non-zero-sized object}}
+ __atomic_store(a, b, memory_order_relaxed); // expected-error {{address
argument to atomic builtin must be a pointer to a non-zero-sized object}}
+ __atomic_store(a, b, memory_order_acq_rel); // expected-error {{address
argument to atomic builtin must be a pointer to a non-zero-sized object}}
+ __atomic_store(a, b, memory_order_acquire); // expected-error {{address
argument to atomic builtin must be a pointer to a non-zero-sized object}}
+ __atomic_store(a, b, memory_order_consume); // expected-error {{address
argument to atomic builtin must be a pointer to a non-zero-sized object}}
+ __atomic_store(a, b, memory_order_release); // expected-error {{address
argument to atomic builtin must be a pointer to a non-zero-sized object}}
+ __atomic_store(a, b, memory_order_seq_cst); // expected-error {{address
argument to atomic builtin must be a pointer to a non-zero-sized object}}
+ __atomic_compare_exchange(a, b, c, 0, memory_order_relaxed,
memory_order_relaxed); // expected-error {{address argument to atomic builtin
must be a pointer to a non-zero-sized object}}
+ __atomic_compare_exchange(a, b, c, 0, memory_order_acq_rel,
memory_order_acq_rel); // expected-error {{address argument to atomic builtin
must be a pointer to a non-zero-sized object}}
+ __atomic_compare_exchange(a, b, c, 0, memory_order_acquire,
memory_order_acquire); // expected-error {{address argument to atomic builtin
must be a pointer to a non-zero-sized object}}
+ __atomic_compare_exchange(a, b, c, 0, memory_order_consume,
memory_order_consume); // expected-error {{address argument to atomic builtin
must be a pointer to a non-zero-sized object}}
+ __atomic_compare_exchange(a, b, c, 0, memory_order_release,
memory_order_release); // expected-error {{address argument to atomic builtin
must be a pointer to a non-zero-sized object}}
+ __atomic_compare_exchange(a, b, c, 0, memory_order_seq_cst,
memory_order_seq_cst); // expected-error {{address argument to atomic builtin
must be a pointer to a non-zero-sized object}}
+
+}
+
void nullPointerWarning(void) {
volatile _Atomic(int) vai;
_Atomic(int) ai;
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