From d10f4bc5a05ce0cdc1646dbb0f706bb9d3dfc0c5 Mon Sep 17 00:00:00 2001 From: Kaelyn Uhrain Date: Wed, 10 Aug 2011 19:47:25 +0000 Subject: [PATCH] Add a test case for the divide-by-zero fix in r137234 git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@137240 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Sema/SemaChecking.cpp | 1 + test/Sema/array-bounds-ptr-arith.c | 14 ++++++++++++++ 2 files changed, 15 insertions(+) create mode 100644 test/Sema/array-bounds-ptr-arith.c diff --git a/lib/Sema/SemaChecking.cpp b/lib/Sema/SemaChecking.cpp index d1fa196569..94e1c4f331 100644 --- a/lib/Sema/SemaChecking.cpp +++ b/lib/Sema/SemaChecking.cpp @@ -3553,6 +3553,7 @@ void Sema::CheckArrayAccess(const Expr *BaseExpr, const Expr *IndexExpr, // Make sure we're comparing apples to apples when comparing index to size uint64_t ptrarith_typesize = Context.getTypeSize(EffectiveType); uint64_t array_typesize = Context.getTypeSize(BaseType); + // Handle ptrarith_typesize being zero, such as when casting to void* if (!ptrarith_typesize) ptrarith_typesize = 1; if (ptrarith_typesize != array_typesize) { // There's a cast to a different size type involved diff --git a/test/Sema/array-bounds-ptr-arith.c b/test/Sema/array-bounds-ptr-arith.c new file mode 100644 index 0000000000..c0e0d0ea78 --- /dev/null +++ b/test/Sema/array-bounds-ptr-arith.c @@ -0,0 +1,14 @@ +// RUN: %clang_cc1 -verify -Warray-bounds-pointer-arithmetic %s + +// Test case from PR10615 +struct ext2_super_block{ + unsigned char s_uuid[8]; // expected-note {{declared here}} +}; +void* ext2_statfs (struct ext2_super_block *es,int a) +{ + return (void *)es->s_uuid + sizeof(int); // no-warning +} +void* broken (struct ext2_super_block *es,int a) +{ + return (void *)es->s_uuid + 80; // expected-warning {{refers past the end of the array}} +} -- 2.40.0