diff options
Diffstat (limited to 'gdb/dwarf2/attribute.h')
| -rw-r--r-- | gdb/dwarf2/attribute.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/gdb/dwarf2/attribute.h b/gdb/dwarf2/attribute.h index 31ff018..234de4e 100644 --- a/gdb/dwarf2/attribute.h +++ b/gdb/dwarf2/attribute.h @@ -123,6 +123,25 @@ struct attribute empty value is returned. */ std::optional<LONGEST> signed_constant () const; + /* Return a signed constant value. However, for narrow forms like + DW_FORM_data1, sign extension is not done. + + DWARF advises compilers to generally use DW_FORM_[su]data to + avoid ambiguity. However, both GCC and LLVM ignore this for + certain attributes. Furthermore in DWARF, whether a narrower + form causes sign-extension depends on the attribute -- for + attributes that can only assume non-negative values, sign + extension is not done. + + Unfortunately, both compilers also emit certain attributes in a + "confused" way, using DW_FORM_sdata for signed values, and + possibly choosing a narrow form (e.g., DW_FORM_data1) otherwise + -- assuming that sign-extension will not be done. + + This method should only be called when this "confused" treatment + is necessary. */ + std::optional<LONGEST> confused_constant () const; + /* Return non-zero if ATTR's value falls in the 'constant' class, or zero otherwise. When this function returns true, you can apply the constant_value method to it. |