31 lines
1.3 KiB
C++
31 lines
1.3 KiB
C++
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// RUN: %clang_cc1 %s -fsyntax-only -verify -pedantic -Wextra -std=c++11
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// RUN: %clang_cc1 %s -fsyntax-only -triple i686-unknown-unknown -verify -pedantic -Wextra -std=c++11
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// RUN: %clang_cc1 %s -fsyntax-only -triple x86_64-unknown-unknown -verify -pedantic -Wextra -std=c++11
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#include <stdint.h>
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void f(intptr_t offset) {
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// A zero offset from a nullptr is OK.
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char *f = (char*)nullptr + 0;
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int *g = (int*)0 + 0;
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f = (char*)nullptr - 0;
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g = (int*)nullptr - 0;
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// adding other values is undefined.
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f = (char*)nullptr + offset; // expected-warning {{arithmetic on a null pointer treated as a cast from integer to pointer is a GNU extension}}
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// Cases that don't match the GNU inttoptr idiom get a different warning.
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f = (char*)0 - offset; // expected-warning {{performing pointer arithmetic on a null pointer has undefined behavior if the offset is nonzero}}
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g = (int*)0 + offset; // expected-warning {{performing pointer arithmetic on a null pointer has undefined behavior if the offset is nonzero}}
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}
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// Value-dependent pointer arithmetic should not produce a nullptr warning.
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template<char *P>
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char* g(intptr_t offset) {
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return P + offset;
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}
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// Value-dependent offsets should not produce a nullptr warning.
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template<intptr_t N>
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char *h() {
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return (char*)nullptr + N;
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}
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