llvm-capstone/clang/test/Preprocessor/macro_paste_bad.c
David Majnemer d3c3e78ac1 Lex: Fix an invalid access into a SmallString
We would crash because we used operator[] to access past the end of a
SmallString.  This occured because our token had length zero.

Instead, form the pointer using .data() and arithmetic.  This is safe
because this forms a one-past-the-end pointer and it is only used to
compare with another one-past-the-end pointer.

This fixes PR21379.

llvm-svn: 220614
2014-10-25 11:40:40 +00:00

45 lines
2.3 KiB
C

// RUN: %clang_cc1 -Eonly -verify -pedantic %s
// pasting ""x"" and ""+"" does not give a valid preprocessing token
#define XYZ x ## +
XYZ // expected-error {{pasting formed 'x+', an invalid preprocessing token}}
#define XXYZ . ## test
XXYZ // expected-error {{pasting formed '.test', an invalid preprocessing token}}
// GCC PR 20077
#define a a ## ## // expected-error {{'##' cannot appear at end of macro expansion}}
#define b() b ## ## // expected-error {{'##' cannot appear at end of macro expansion}}
#define c c ## // expected-error {{'##' cannot appear at end of macro expansion}}
#define d() d ## // expected-error {{'##' cannot appear at end of macro expansion}}
#define e ## ## e // expected-error {{'##' cannot appear at start of macro expansion}}
#define f() ## ## f // expected-error {{'##' cannot appear at start of macro expansion}}
#define g ## g // expected-error {{'##' cannot appear at start of macro expansion}}
#define h() ## h // expected-error {{'##' cannot appear at start of macro expansion}}
#define i ## // expected-error {{'##' cannot appear at start of macro expansion}}
#define j() ## // expected-error {{'##' cannot appear at start of macro expansion}}
// Invalid token pasting.
// PR3918
// When pasting creates poisoned identifiers, we error.
#pragma GCC poison BLARG
BLARG // expected-error {{attempt to use a poisoned identifier}}
#define XX BL ## ARG
XX // expected-error {{attempt to use a poisoned identifier}}
#define VA __VA_ ## ARGS__
int VA; // expected-warning {{__VA_ARGS__ can only appear in the expansion of a C99 variadic macro}}
#define LOG_ON_ERROR(x) x ## #y; // expected-error {{'#' is not followed by a macro parameter}}
LOG_ON_ERROR(0);
#define PR21379A(x) printf ##x // expected-note {{macro 'PR21379A' defined here}}
PR21379A(0 {, }) // expected-error {{too many arguments provided to function-like macro invocation}}
// expected-note@-1 {{parentheses are required around macro argument containing braced initializer list}}
#define PR21379B(x) printf #x // expected-note {{macro 'PR21379B' defined here}}
PR21379B(0 {, }) // expected-error {{too many arguments provided to function-like macro invocation}}
// expected-note@-1 {{parentheses are required around macro argument containing braced initializer list}}