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2e7b95e4c0
The commit adds serialization and de-serialization implementations for the stored regions. Basically, the serialized representation of the regions of a PP is a (ordered) sequence of source location encodings. For de-serialization, regions from loaded files are stored by their ASTs. When later one queries if a loaded location L is in an opt-out region, PP looks up the regions of the loaded AST where L is at. (Background if helps: a pair of `#pragma clang unsafe_buffer_usage begin/end` pragmas marks a warning-opt-out region. The begin and end locations (opt-out regions) are stored in preprocessor instances (PP) and will be queried by the `-Wunsafe-buffer-usage` analyzer.) The reported issue at upstream: https://github.com/llvm/llvm-project/issues/90501 rdar://124035402
26 lines
785 B
C++
26 lines
785 B
C++
// RUN: rm -rf %t
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// RUN: mkdir -p %t
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// RUN: split-file %s %t
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// RUN: %clang_cc1 -Wno-unused-value -std=c++20 -emit-pch -o %t/header.pch %t/header.h -x c++
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// RUN: %clang_cc1 -Wno-unused-value -Wunsafe-buffer-usage -std=c++20 -include-pch %t/header.pch -verify %t/main.cpp
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//--- header.h
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int foo(int *p) {
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return p[5]; // This will be warned
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}
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#pragma clang unsafe_buffer_usage begin // The opt-out region spans over two files of one TU
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#include "header-2.h"
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//--- header-2.h
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int bar(int *p) {
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return p[5]; // suppressed by the cross-file opt-out region
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}
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#pragma clang unsafe_buffer_usage end
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//--- main.cpp
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// expected-warning@header.h:2 {{unsafe buffer access}}
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// expected-note@header.h:2 {{pass -fsafe-buffer-usage-suggestions to receive code hardening suggestions}}
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