================
@@ -0,0 +1,40 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -Walloc-size %s
+struct Foo { int x[10]; };
+
+typedef __typeof__(sizeof(int)) size_t;
+void *my_malloc(size_t) __attribute__((alloc_size(1)));
+void *my_calloc(size_t, size_t) __attribute__((alloc_size(2, 1)));
+
+void foo_consumer(struct Foo* p);
+
+void alloc_foo(void) {
+ struct Foo *ptr1 = my_malloc(sizeof(struct Foo));
+ struct Foo *ptr2 = my_malloc(sizeof(*ptr2));
+ struct Foo *ptr3 = my_calloc(1, sizeof(*ptr3));
+ struct Foo *ptr4 = my_calloc(sizeof(*ptr4), 1);
+ struct Foo (*ptr5)[5] = my_malloc(sizeof(*ptr5));
+ void *ptr6 = my_malloc(4);
+
+ // Test insufficient size with different allocation functions.
+ struct Foo *ptr7 = my_malloc(sizeof(ptr7)); // expected-warning
{{allocation of insufficient size '8' for type 'struct Foo' with size '40'}}
+ struct Foo *ptr8 = my_calloc(1, sizeof(ptr8)); // expected-warning
{{allocation of insufficient size '8' for type 'struct Foo' with size '40'}}
+ struct Foo *ptr9 = my_calloc(sizeof(ptr9), 1); // expected-warning
{{allocation of insufficient size '8' for type 'struct Foo' with size '40'}}
+
+ // Test function arguments.
+ foo_consumer(my_malloc(4)); // expected-warning {{allocation of insufficient
size '4' for type 'struct Foo' with size '40'}}
+
+ // Test explicit cast.
+ struct Foo *ptr10 = (struct Foo *)my_malloc(sizeof(*ptr10));
+ struct Foo *ptr11 = (struct Foo *)my_malloc(sizeof(ptr11)); //
expected-warning {{allocation of insufficient size '8' for type 'struct Foo'
with size '40'}}
+ struct Foo *ptr12 = (struct Foo *)my_calloc(1, sizeof(ptr12)); //
expected-warning {{allocation of insufficient size '8' for type 'struct Foo'
with size '40'}}
+ struct Foo *ptr13 = (struct Foo *)my_malloc(4); //
expected-warning {{allocation of insufficient size '4' for type 'struct Foo'
with size '40'}}
+ void *ptr14 = (struct Foo *)my_malloc(4); //
expected-warning {{allocation of insufficient size '4' for type 'struct Foo'
with size '40'}}
+
+ struct Foo *ptr15 = (void *)(struct Foo *)my_malloc(4); // expected-warning
2 {{allocation of insufficient size '4' for type 'struct Foo' with size '40'}}
+ int *ptr16 = (unsigned *)(void *)(int *)my_malloc(1); // expected-warning
{{initializing 'int *' with an expression of type 'unsigned int *' converts
between pointers to integer types with different sign}}
+ // expected-warning@-1
{{allocation of insufficient size '1' for type 'int' with size '4'}}
+ // expected-warning@-2
{{allocation of insufficient size '1' for type 'unsigned int' with size '4'}}
+ int *ptr17 = (void *)(int *)my_malloc(1); // expected-warning
{{allocation of insufficient size '1' for type 'int' with size '4'}}
+ // expected-warning@-1
{{allocation of insufficient size '1' for type 'int' with size '4'}}
+ (void)(int *)my_malloc(1); // expected-warning
{{allocation of insufficient size '1' for type 'int' with size '4'}}
+}
----------------
vvuksanovic wrote:
That is an interesting case. It should be okay, and GCC doesn't emit a warning
as well. Though the return value of `malloc(0)` is implementation defined.
https://github.com/llvm/llvm-project/pull/150028
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