https://bugs.llvm.org/show_bug.cgi?id=51770
Bug ID: 51770
Summary: [codeview] Invalid encoding of signed ints when
emitting S_CONSTANTs
Product: libraries
Version: 12.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: DebugInfo
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected],
[email protected]
Signed integers are incorrectly encoded to CodeView S_CONSTANTs.
Tracked down to this commit
https://github.com/llvm/llvm-project/commit/7156910d85fcafdc78371a852c00a7184f8563cd
Before this commit the constant values were encoded as expected.
Clang 12.x: S_CONSTANT: Type: T_INT4(0074), Value: (LF_CHAR) -128(0x80), E1
Clang 10.x: S_CONSTANT: Type: T_INT4(0074), Value: 128, E1
The following example demonstrates the problem.
enum {
E0 = 127, // OK: 127
E1 = 128, // FAIL: -128
E2 = 129, // FAIL: -127
E3 = 254, // FAIL: -2
E4 = 255, // FAIL: -1
E5 = 256, // FAIL: 0
E6 = 257, // FAIL: 1
E7 = 511, // FAIL: -1
E8 = 512, // FAIL: 0
E9 = 513, // FAIL: 1
};
int main() {
return E0 + E1 + E2 + E3 + E4 + E5 + E6 + E7 + E8 + E9; // ensure usage
};
(Separately, note that LLDB has a bug / missing feature where it is unable to
resolve any of these S_CONSTANTs giving the error "use of undeclared
identifier").
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