Author: Timm Baeder Date: 2026-03-23T09:35:19+01:00 New Revision: cda88c253cbdc832c798cd36cd7670d359ee71bb
URL: https://github.com/llvm/llvm-project/commit/cda88c253cbdc832c798cd36cd7670d359ee71bb DIFF: https://github.com/llvm/llvm-project/commit/cda88c253cbdc832c798cd36cd7670d359ee71bb.diff LOG: [clang][bytecode] Check for block pointers in __builtin_strlen() (#187988) Added: Modified: clang/lib/AST/ByteCode/InterpBuiltin.cpp clang/test/AST/ByteCode/builtins.c Removed: ################################################################################ diff --git a/clang/lib/AST/ByteCode/InterpBuiltin.cpp b/clang/lib/AST/ByteCode/InterpBuiltin.cpp index fa4eb2077e44e..5f8bfcc452387 100644 --- a/clang/lib/AST/ByteCode/InterpBuiltin.cpp +++ b/clang/lib/AST/ByteCode/InterpBuiltin.cpp @@ -357,6 +357,9 @@ static bool interp__builtin_strlen(InterpState &S, CodePtr OpPC, if (!CheckLive(S, OpPC, StrPtr, AK_Read)) return false; + if (!StrPtr.isBlockPointer()) + return false; + if (!CheckDummy(S, OpPC, StrPtr.block(), AK_Read)) return false; diff --git a/clang/test/AST/ByteCode/builtins.c b/clang/test/AST/ByteCode/builtins.c index 5630a36e1c05b..2d19ccb51de03 100644 --- a/clang/test/AST/ByteCode/builtins.c +++ b/clang/test/AST/ByteCode/builtins.c @@ -19,3 +19,6 @@ void f2() { __builtin_memchr(f2, 0, 1); } _Static_assert(__atomic_is_lock_free(4, (void*)2), ""); // both-error {{not an integral constant expression}} + +_Static_assert(__builtin_strlen((void*)0 + 1) == 2, ""); // both-error {{not an integral constant expression}} \ + // both-note {{cannot perform pointer arithmetic on null pointer}} _______________________________________________ cfe-commits mailing list [email protected] https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
