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It's possible to load out-of-range values from bitfields backed by a
boolean or an enum. Check for UB loads from bitfields.
This is the motivating example:
struct S {
BOOL b : 1; // Signed ObjC BOOL.
};
S s;
s.b = 1; // This is actually stored as -1.
if (s.b == 1) // Evaluates to false, -1 != 1.
...
Changes since the original commit:
- Single-bit bools are a special case (see CGF::EmitFromMemory), and we
can't avoid dealing with them when loading from a bitfield. Don't try to
insert a check in this case.
Differential Revision: https://reviews.llvm.org/D30423
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@297389 91177308-0d34-0410-b5e6-96231b3b80d8
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This reverts commit r297298. It breaks the self-host on this bot:
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-bootstrap/builds/962/steps/build%20clang%2Fubsan/logs/stdio
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@297331 91177308-0d34-0410-b5e6-96231b3b80d8
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It's possible to load out-of-range values from bitfields backed by a
boolean or an enum. Check for UB loads from bitfields.
This is the motivating example:
struct S {
BOOL b : 1; // Signed ObjC BOOL.
};
S s;
s.b = 1; // This is actually stored as -1.
if (s.b == 1) // Evaluates to false, -1 != 1.
...
Differential Revision: https://reviews.llvm.org/D30423
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@297298 91177308-0d34-0410-b5e6-96231b3b80d8
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