Disallow explicit cast to nt_array_ptr in checked scopes (#391) #626
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Disallow cast from other checked pointer types to nt_array_ptr in checked scopes because the source pointer might not point to a NULL_terminated array. Casting from an unchecked pointer to a nt_array_ptr pointer should also be prohibited; this has already been handled as no unchecked pointers are allowed in checked scopes. Also added a new error message in clang/include/clang/Basic/DiagnosticSemaKinds.td for casting to nt_array_ptr in checked scopes. The test file tests/typechecking/checked_scope_basic.c was updated with a new function test_cast_to_nt_array_ptr to test casting to nt_array_ptr.
dtarditi
reviewed
Jul 9, 2019
lib/Sema/SemaCast.cpp
Outdated
| // Disallow cast from other Checked Pointer types to nt_arary_ptr because | ||
| // the SrcType might not point to a NULL-terminated array. | ||
| if (DestType->isPointerType()) { | ||
| if (cast<PointerType>(DestType)->getKind() == CheckedPointerKind::NtArray) { |
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Could you use the function isCheckedPointerNtArrayType for testing whether a type is or is not an nt_array_ptr type?
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I have updated the code as suggested.
In the code that disallows casting to nt_array_ptr in a checked scope, we can use an exsiting helper function isCheckedPointerNtArrayType() to test whether a pointer type is nt_array_ptr. This makes the code a little bit cleaner.
mgrang
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Sep 27, 2019
Cherry-picked from commit e13fcff Disallow cast from other checked pointer types to nt_array_ptr in checked scopes because the source pointer might not point to a NULL_terminated array. Casting from an unchecked pointer to a nt_array_ptr pointer should also be prohibited; this has already been handled as no unchecked pointers are allowed in checked scopes. Also added a new error message in clang/include/clang/Basic/DiagnosticSemaKinds.td for casting to nt_array_ptr in checked scopes. The test file tests/typechecking/checked_scope_basic.c was updated with a new function test_cast_to_nt_array_ptr to test casting to nt_array_ptr.
sulekhark
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that referenced
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Jul 8, 2021
…indows. (#626) * Fix escaping bugs that currently affect the JSON formatting test on Windows. Other escaping bugs may remain; #620 is to fix all of them. Fixes #619. * Add test of a backslash in a file path on Linux and Mac OS X. While I'm here, fix a typo in the name of json_formating.c and add `--` to its `3c` command lines.
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Disallow cast from other checked pointer types to nt_array_ptr in
checked scopes because the source pointer might not point to a
NULL_terminated array. Casting from an unchecked pointer to a
nt_array_ptr pointer should also be prohibited; this has already been
handled as no unchecked pointers are allowed in checked scopes.
Also added a new error message in
clang/include/clang/Basic/DiagnosticSemaKinds.td for casting to
nt_array_ptr in checked scopes.
The test file tests/typechecking/checked_scope_basic.c was updated
with a new function test_cast_to_nt_array_ptr to test
casting to nt_array_ptr.
The change passed the new test code and the regression tests for
checkedc and clang.