739b410f1f
See https://docs.google.com/document/d/1xMkTZMKx9llnMPgso0jrx3ankI4cv60xeZ0y4ksf4wc/preview for background discussion. This adds a warning, flags and pragmas to limit the number of pre-processor tokens either at a certain point in a translation unit, or overall. The idea is that this would allow projects to limit the size of certain widely included headers, or for translation units overall, as a way to insert backstops for header bloat and prevent compile-time regressions. Differential revision: https://reviews.llvm.org/D72703
24 lines
1.4 KiB
C++
24 lines
1.4 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify %s
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// RUN: %clang_cc1 -fsyntax-only -verify %s -DMAX_TOKENS -fmax-tokens 2
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// RUN: %clang_cc1 -fsyntax-only -verify %s -DMAX_TOKENS_OVERRIDE -fmax-tokens 9
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int x, y, z;
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#pragma clang max_tokens_here // expected-error {{missing argument to '#pragma clang max_tokens_here'; expected integer}}
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#pragma clang max_tokens_here foo // expected-error {{expected an integer argument in '#pragma clang max_tokens_here'}}
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#pragma clang max_tokens_here 123 456 // expected-warning{{extra tokens at end of '#pragma clang max_tokens_here' - ignored}}
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#pragma clang max_tokens_here 1 // expected-warning{{the number of preprocessor source tokens (7) exceeds this token limit (1)}}
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#pragma clang max_tokens_total // expected-error{{missing argument to '#pragma clang max_tokens_total'; expected integer}}
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#pragma clang max_tokens_total foo // expected-error{{expected an integer argument in '#pragma clang max_tokens_total'}}
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#pragma clang max_tokens_total 123 456 // expected-warning{{extra tokens at end of '#pragma clang max_tokens_total' - ignored}}
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#ifdef MAX_TOKENS_OVERRIDE
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#pragma clang max_tokens_total 3 // expected-warning@+4{{the total number of preprocessor source tokens (8) exceeds the token limit (3)}}
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// expected-note@-1{{total token limit set here}}
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#elif MAX_TOKENS
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// expected-warning@+1{{the total number of preprocessor source tokens (8) exceeds the token limit (2)}}
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#endif
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