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Introduce attribute::signed_constant

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This introduces a new method, attribute::signed_constant.  This should
be used wherever DWARF specifies a signed integer constant, or where
this is implied by the context.  It properly handles sign-extension
for DW_FORM_data*.

To my surprise, there doesn't seem to be a pre-existing sign-extension
function.  I've added one to common-utils.h alongside the align
functions.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32680
This commit is contained in:
Tom Tromey
2025-02-24 12:26:36 -07:00
parent 5f90d44355
commit 3d0e5b9992
3 changed files with 49 additions and 0 deletions
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10
gdbsupport/common-utils.h
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@@ -196,6 +196,16 @@ in_inclusive_range (T value, T low, T high)
extern ULONGEST align_up (ULONGEST v, int n);
extern ULONGEST align_down (ULONGEST v, int n);
/* Sign-extend the value V, using N as the number of valid bits. That
is, bit N-1 is the sign bit. The higher-order bits (those outside
0..N-1) must be zero. */
static inline ULONGEST
sign_extend (ULONGEST v, int n)
{
ULONGEST mask = (ULONGEST) 1 << (n - 1);
return (v ^ mask) - mask;
}
/* Convert hex digit A to a number, or throw an exception. */
extern int fromhex (int a);