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Avoid undefined behavior in read_subrange_type

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-fsanitize=undefined pointed out an undefined shift of a negative
value in read_subrange_type.  The fix is to do the work in an unsigned
type, where this is defined.

gdb/ChangeLog
2018-10-03  Tom Tromey  <tom@tromey.com>

	* dwarf2read.c (read_subrange_type): Make "negative_mask"
	unsigned.
This commit is contained in:
Tom Tromey
2018-07-29 17:29:24 -06:00
parent 0101665f86
commit d359392f97
2 changed files with 7 additions and 2 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2018-10-03 Tom Tromey <tom@tromey.com>
* dwarf2read.c (read_subrange_type): Make "negative_mask"
unsigned.
2018-10-03 Tom Tromey <tom@tromey.com>
* findvar.c (extract_integer): Do work in an unsigned type.

4
gdb/dwarf2read.c
View File

@ -17709,7 +17709,7 @@ read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
int low_default_is_valid;
int high_bound_is_count = 0;
const char *name;
LONGEST negative_mask;
ULONGEST negative_mask;
orig_base_type = die_type (die, cu);
/* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
@ -17842,7 +17842,7 @@ read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
the bounds as signed, and thus sign-extend their values, when
the base type is signed. */
negative_mask =
-((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
-((ULONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
if (low.kind == PROP_CONST
&& !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
low.data.const_val |= negative_mask;