e07ead85a3
Previously we only have an extension that warn void pointer deferencing in C++, but for C we did nothing. C2x 6.5.3.2p4 says The unary * operator denotes indirection. If it points to an object, the result is an lvalue designating the object. However, there is no way to form an lvalue designating an object of an incomplete type as 6.3.2.1p1 says "an lvalue is an expression (with an object type other than void)", so the behavior is undefined. Fixes https://github.com/llvm/llvm-project/issues/53631 Signed-off-by: Jun Zhang <jun@junz.org> Differential Revision: https://reviews.llvm.org/D134461
118 lines
6.0 KiB
C
118 lines
6.0 KiB
C
// RUN: %clang_cc1 -fsyntax-only -Wno-pointer-to-int-cast -verify -pedantic -Wsign-conversion %s
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void foo(void) {
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*(0 ? (double *)0 : (void *)0) = 0;
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// FIXME: GCC doesn't consider the following two statements to be errors.
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*(0 ? (double *)0 : (void *)(int *)0) = 0; /* expected-error {{incomplete type 'void' is not assignable}}
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expected-warning {{ISO C does not allow indirection on operand of type 'void *'}} */
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*(0 ? (double *)0 : (void *)(double *)0) = 0; /* expected-error {{incomplete type 'void' is not assignable}}
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expected-warning {{ISO C does not allow indirection on operand of type 'void *'}} */
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*(0 ? (double *)0 : (int *)(void *)0) = 0; /* expected-error {{incomplete type 'void' is not assignable}}
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expected-warning {{pointer type mismatch ('double *' and 'int *')}}
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expected-warning {{ISO C does not allow indirection on operand of type 'void *'}} */
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*(0 ? (double *)0 : (double *)(void *)0) = 0;
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*((void *) 0) = 0; /* expected-error {{incomplete type 'void' is not assignable}}
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expected-warning {{ISO C does not allow indirection on operand of type 'void *'}} */
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double *dp;
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int *ip;
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void *vp;
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dp = vp;
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vp = dp;
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ip = dp; // expected-warning {{incompatible pointer types assigning to 'int *' from 'double *'}}
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dp = ip; // expected-warning {{incompatible pointer types assigning to 'double *' from 'int *'}}
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dp = 0 ? (double *)0 : (void *)0;
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vp = 0 ? (double *)0 : (void *)0;
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ip = 0 ? (double *)0 : (void *)0; // expected-warning {{incompatible pointer types assigning to 'int *' from 'double *'}}
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const int *cip;
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vp = (0 ? vp : cip); // expected-warning {{discards qualifiers}}
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vp = (0 ? cip : vp); // expected-warning {{discards qualifiers}}
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int i = 2;
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int (*pf)[2];
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int (*pv)[i];
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pf = (i ? pf : pv);
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enum {xxx,yyy,zzz} e, *ee;
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short x;
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ee = ee ? &x : ee ? &i : &e; // expected-warning {{pointer type mismatch}}
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typedef void *asdf;
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*(0 ? (asdf) 0 : &x) = 10;
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unsigned long test0 = 5;
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test0 = test0 ? (long) test0 : test0; // expected-warning {{operand of ? changes signedness: 'long' to 'unsigned long'}}
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test0 = test0 ? (int) test0 : test0; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
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test0 = test0 ? (short) test0 : test0; // expected-warning {{operand of ? changes signedness: 'short' to 'unsigned long'}}
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test0 = test0 ? test0 : (long) test0; // expected-warning {{operand of ? changes signedness: 'long' to 'unsigned long'}}
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test0 = test0 ? test0 : (int) test0; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
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test0 = test0 ? test0 : (short) test0; // expected-warning {{operand of ? changes signedness: 'short' to 'unsigned long'}}
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test0 = test0 ? test0 : (long) 10;
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test0 = test0 ? test0 : (int) 10;
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test0 = test0 ? test0 : (short) 10;
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test0 = test0 ? (long) 10 : test0;
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test0 = test0 ? (int) 10 : test0;
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test0 = test0 ? (short) 10 : test0;
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int test1;
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enum Enum { EVal };
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test0 = test0 ? EVal : test0;
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test1 = test0 ? EVal : (int) test0;
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test0 = test0 ?
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(unsigned) EVal
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: (int) test0; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
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test0 = test0 ? EVal : test1; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
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test0 = test0 ? test1 : EVal; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
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const int *const_int;
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int *nonconst_int;
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*(test0 ? const_int : nonconst_int) = 42; // expected-error {{read-only variable is not assignable}}
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*(test0 ? nonconst_int : const_int) = 42; // expected-error {{read-only variable is not assignable}}
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// The composite type here should be "int (*)[12]", fine for the sizeof
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int (*incomplete)[];
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int (*complete)[12];
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sizeof(*(test0 ? incomplete : complete)); // expected-warning {{expression result unused}}
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sizeof(*(test0 ? complete : incomplete)); // expected-warning {{expression result unused}}
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int __attribute__((address_space(2))) *adr2;
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int __attribute__((address_space(3))) *adr3;
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test0 ? adr2 : adr3; // expected-error{{conditional operator with the second and third operands of type ('__attribute__((address_space(2))) int *' and '__attribute__((address_space(3))) int *') which are pointers to non-overlapping address spaces}}
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// Make sure address-space mask ends up in the result type
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(test0 ? (test0 ? adr2 : adr2) : nonconst_int); // expected-error{{conditional operator with the second and third operands of type ('__attribute__((address_space(2))) int *' and 'int *') which are pointers to non-overlapping address spaces}}
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}
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int Postgresql(void) {
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char x;
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return ((((&x) != ((void *) 0)) ? (*(&x) = ((char) 1)) : (void) ((void *) 0)), (unsigned long) ((void *) 0)); // expected-warning {{C99 forbids conditional expressions with only one void side}}
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}
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#define nil ((void*) 0)
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extern int f1(void);
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int f0(int a) {
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// GCC considers this a warning.
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return a ? f1() : nil; // expected-warning {{pointer/integer type mismatch in conditional expression ('int' and 'void *')}} expected-error {{incompatible pointer to integer conversion returning 'void *' from a function with result type 'int'}}
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}
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int f2(int x) {
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// We can suppress this because the immediate context wants an int.
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return (x != 0) ? 0U : x;
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}
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#define NULL (void*)0
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void PR9236(void) {
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struct A {int i;} A1;
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(void)(1 ? A1 : NULL); // expected-error{{non-pointer operand type 'struct A' incompatible with NULL}}
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(void)(1 ? NULL : A1); // expected-error{{non-pointer operand type 'struct A' incompatible with NULL}}
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(void)(1 ? 0 : A1); // expected-error{{incompatible operand types}}
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(void)(1 ? (void*)0 : A1); // expected-error{{incompatible operand types}}
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(void)(1 ? A1: (void*)0); // expected-error{{incompatible operand types}}
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(void)(1 ? A1 : (NULL)); // expected-error{{non-pointer operand type 'struct A' incompatible with NULL}}
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}
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