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hanchenye-llvm-project/clang/test/Sema/PR16678.c

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Consider unsigned long for non-u/U decimal literals (C90/C++03) Summary: This modifies Clang to reflect that under pre-C99 ISO C, decimal constants may have type `unsigned long` even if they do not contain `u` or `U` in their suffix (C90 subclause 6.1.3.2 paragraph 5). The same is done for C++ without C++11 which--because of undefined behaviour--allows for behaviour compatible with ISO C90 in the case of an unsuffixed decimal literal and is otherwise identical to C90 in its treatment of integer literals (C++03 subclause 2.13.1 [lex.icon] paragraph 2). Messages are added to the `c99-compat` and `c++11-compat` groups to warn on such literals, since they behave differently under the newer standards. Fixes PR 16678. Test Plan: A new test file is added to exercise both pre-C99/C++11 and C99/C++11-up on decimal literals with no suffix or suffixes `l`/`L` for both 32-bit and 64-bit `long`. In the file, 2^31 (being `INT_MAX+1`) is tested for the expected type using `__typeof__` and multiple declarations of the same entity. 2^63 is similarly tested when it is within the range of `unsigned long`. Preprocessor arithmetic tests are added to ensure consistency given that Clang (like GCC) uses greater than 32 bits for preprocessor arithmetic even when `long` and `unsigned long` is 32 bits and a pre-C99/C++11 mode is in effect. Tests added: test/Sema/PR16678.c Reviewers: fraggamuffin, rsmith Reviewed By: rsmith Subscribers: cfe-commits Differential Revision: http://reviews.llvm.org/D9794 llvm-svn: 239356
2015-06-09 05:59:59 +08:00
// RUN: %clang_cc1 -DX32TYPE=ULONG -triple powerpc-unknown-linux-gnu -std=c89 -x c %s -verify
// RUN: %clang_cc1 -DX32TYPE=ULONG -triple powerpc-unknown-linux-gnu -std=iso9899:199409 -x c %s -verify
// RUN: %clang_cc1 -DX32TYPE=ULONG -triple powerpc-unknown-linux-gnu -std=c++98 -x c++ %s -verify
// RUN: %clang_cc1 -DX32TYPE=LLONG -triple powerpc-unknown-linux-gnu -std=c99 -x c %s -verify
// RUN: %clang_cc1 -DX32TYPE=LLONG -triple powerpc-unknown-linux-gnu -std=c11 -x c %s -verify
// RUN: %clang_cc1 -DX32TYPE=LLONG -triple powerpc-unknown-linux-gnu -std=c++11 -x c++ %s -verify
// RUN: %clang_cc1 -DX32TYPE=LLONG -triple powerpc-unknown-linux-gnu -std=c++1y -x c++ %s -verify
// RUN: %clang_cc1 -DX32TYPE=LLONG -triple powerpc-unknown-linux-gnu -std=c++1z -x c++ %s -verify
// RUN: %clang_cc1 -DX64TYPE=ULONG -triple powerpc64-unknown-linux-gnu -std=c89 -x c %s -verify
// RUN: %clang_cc1 -DX64TYPE=ULONG -triple powerpc64-unknown-linux-gnu -std=iso9899:199409 -x c %s -verify
// RUN: %clang_cc1 -DX64TYPE=ULONG -triple powerpc64-unknown-linux-gnu -std=c++98 -x c++ %s -verify
// RUN: %clang_cc1 -DX64TYPE=ULLONG -triple powerpc64-unknown-linux-gnu -std=c99 -x c %s -verify
// RUN: %clang_cc1 -DX64TYPE=ULLONG -triple powerpc64-unknown-linux-gnu -std=c11 -x c %s -verify
// RUN: %clang_cc1 -DX64TYPE=ULLONG -triple powerpc64-unknown-linux-gnu -std=c++11 -x c++ %s -verify
// RUN: %clang_cc1 -DX64TYPE=ULLONG -triple powerpc64-unknown-linux-gnu -std=c++1y -x c++ %s -verify
// RUN: %clang_cc1 -DX64TYPE=ULLONG -triple powerpc64-unknown-linux-gnu -std=c++1z -x c++ %s -verify
#ifdef X64TYPE
#define X32TYPE long
#endif
#define IS_ULONG_ULONG 1
#define IS_ULONG2(X) IS_ULONG_##X
#define IS_ULONG(X) IS_ULONG2(X)
#if !defined(X64TYPE) && !IS_ULONG(X32TYPE)
// expected-no-diagnostics
#endif
typedef unsigned long ULONG;
typedef long long LLONG;
typedef unsigned long long ULLONG;
/******************************************************************************
* Test 2^31 as a decimal literal with no suffix and with the "l" and "L" cases.
******************************************************************************/
extern X32TYPE x32;
extern __typeof__(2147483648) x32;
extern __typeof__(2147483648l) x32;
extern __typeof__(2147483648L) x32;
#if IS_ULONG(X32TYPE)
#if !__cplusplus
/******************************************************************************
* Under pre-C99 ISO C, unsigned long is attempted for decimal integer literals
* that do not have a suffix containing "u" or "U" if the literal does not fit
* within the range of int or long. See 6.1.3.2 paragraph 5.
******************************************************************************/
// expected-warning@39 {{integer literal is too large to be represented in type 'long', interpreting as 'unsigned long' per C89; this literal will have type 'long long' in C99 onwards}}
// expected-warning@40 {{integer literal is too large to be represented in type 'long', interpreting as 'unsigned long' per C89; this literal will have type 'long long' in C99 onwards}}
// expected-warning@41 {{integer literal is too large to be represented in type 'long', interpreting as 'unsigned long' per C89; this literal will have type 'long long' in C99 onwards}}
#else
/******************************************************************************
* Under pre-C++11 ISO C++, the same holds if the literal contains an "l" or "L"
* in its suffix; otherwise, the behavior is undefined. See 2.13.1 [lex.icon]
* paragraph 2.
******************************************************************************/
// expected-warning@39 {{integer literal is too large to be represented in type 'long' and is subject to undefined behavior under C++98, interpreting as 'unsigned long'; this literal will have type 'long long' in C++11 onwards}}
// expected-warning@40 {{integer literal is too large to be represented in type 'long', interpreting as 'unsigned long' per C++98; this literal will have type 'long long' in C++11 onwards}}
// expected-warning@41 {{integer literal is too large to be represented in type 'long', interpreting as 'unsigned long' per C++98; this literal will have type 'long long' in C++11 onwards}}
#endif
#endif
#ifdef X64TYPE
/******************************************************************************
* Test 2^63 as a decimal literal with no suffix and with the "l" and "L" cases.
******************************************************************************/
extern X64TYPE x64;
extern __typeof__(9223372036854775808) x64;
extern __typeof__(9223372036854775808l) x64;
extern __typeof__(9223372036854775808L) x64;
#if IS_ULONG(X64TYPE)
#if !__cplusplus
/******************************************************************************
* Under pre-C99 ISO C, unsigned long is attempted for decimal integer literals
* that do not have a suffix containing "u" or "U" if the literal does not fit
* within the range of int or long. See 6.1.3.2 paragraph 5.
******************************************************************************/
// expected-warning@74 {{integer literal is too large to be represented in type 'long', interpreting as 'unsigned long' per C89; this literal will be ill-formed in C99 onwards}}
// expected-warning@75 {{integer literal is too large to be represented in type 'long', interpreting as 'unsigned long' per C89; this literal will be ill-formed in C99 onwards}}
// expected-warning@76 {{integer literal is too large to be represented in type 'long', interpreting as 'unsigned long' per C89; this literal will be ill-formed in C99 onwards}}
#else
/******************************************************************************
* Under pre-C++11 ISO C++, the same holds if the literal contains an "l" or "L"
* in its suffix; otherwise, the behavior is undefined. See 2.13.1 [lex.icon]
* paragraph 2.
******************************************************************************/
// expected-warning@74 {{integer literal is too large to be represented in type 'long' and is subject to undefined behavior under C++98, interpreting as 'unsigned long'; this literal will be ill-formed in C++11 onwards}}
// expected-warning@75 {{integer literal is too large to be represented in type 'long', interpreting as 'unsigned long' per C++98; this literal will be ill-formed in C++11 onwards}}
// expected-warning@76 {{integer literal is too large to be represented in type 'long', interpreting as 'unsigned long' per C++98; this literal will be ill-formed in C++11 onwards}}
#endif
#else
/******************************************************************************
* The status quo in C99/C++11-and-later modes for the literals in question is
* to interpret them as unsigned as an extension.
******************************************************************************/
// expected-warning@74 {{integer literal is too large to be represented in a signed integer type, interpreting as unsigned}}
// expected-warning@75 {{integer literal is too large to be represented in a signed integer type, interpreting as unsigned}}
// expected-warning@76 {{integer literal is too large to be represented in a signed integer type, interpreting as unsigned}}
#endif
#endif
/******************************************************************************
* Test preprocessor arithmetic with 2^31 as a decimal literal with no suffix
* and with the "l" and "L" cases.
******************************************************************************/
#if !IS_ULONG(X32TYPE)
/******************************************************************************
* If the literal is signed without need for the modified range of the signed
* integer types within the controlling constant expression for conditional
* inclusion, then it will also be signed with said modified range.
******************************************************************************/
#define EXPR(X) ((X - X) - 1 < 0)
#else
/******************************************************************************
* Strictly speaking, in pre-C99/C++11 ISO C/C++, the preprocessor arithmetic is
* evaluated with the range of long/unsigned long; however, both Clang and GCC
* evaluate using 64-bits even when long/unsigned long are 32-bits outside of
* preprocessing.
*
* If the range used becomes 32-bits, then this test will enforce the treatment
* as unsigned of the literals in question.
*
* Note:
* Under pre-C99/C++11 ISO C/C++, whether the interpretation of the literal is
* affected by the modified range of the signed and unsigned integer types
* within the controlling constant expression for conditional inclusion is
* unclear.
******************************************************************************/
#define PP_LONG_MAX ((0ul - 1ul) >> 1)
#define EXPR(X) \
(PP_LONG_MAX >= 0x80000000 || (X - X) - 1 > 0) // either 2^31 fits into a
// preprocessor "long" or the
// literals in question are
// unsigned
#endif
#if !(EXPR(2147483648) && EXPR(2147483648l) && EXPR(2147483648L))
#error Unexpected signedness or conversion behavior
#endif