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Fix empty DWARF expressions DATA vs. SIZE conditionals.
	* dwarf2loc.c (dwarf2_find_location_expression): Clear *LOCEXPR_LENGTH.
	(dwarf_expr_frame_base_1): Indicate unavailability via zero *LENGTH.
	(locexpr_tracepoint_var_ref): Check only zero SIZE, not zero DATA.
	(loclist_read_variable, loclist_tracepoint_var_ref): Do not check for
	zero DATA.
	* dwarf2loc.h (struct dwarf2_locexpr_baton): Comment DATA vs. SIZE
	validity.
	* dwarf2read.c (struct dwarf_block): Comment DATA validity.
	(dwarf2_fetch_die_location_block, dwarf2_symbol_mark_computed): Do not
	clear DATA on zero SIZE.

gdb/testsuite/
	Fix empty DWARF expressions DATA vs. SIZE conditionals.
	* gdb.dwarf2/dw2-op-call.S (arraycallnoloc, arraynoloc): New DIEs.
	(loclist): New.
	(4): New abbrev.
	* gdb.dwarf2/dw2-op-call.exp: Remove variable srcfile and executable.
	Use prepare_for_testing, remove clean_restart.
	(p arraynoloc, p arraycallnoloc): New tests.
This commit is contained in:
Jan Kratochvil
2011-10-12 22:04:12 +00:00
parent 6885131b49
commit 1d6edc3c37
7 changed files with 81 additions and 21 deletions
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4
gdb/dwarf2read.c
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@ -722,6 +722,8 @@ struct function_range
struct dwarf_block
{
unsigned int size;
/* Valid only if SIZE is not zero. */
gdb_byte *data;
};
@ -14217,7 +14219,6 @@ dwarf2_fetch_die_location_block (unsigned int offset,
{
/* DWARF: "If there is no such attribute, then there is no effect.". */
retval.data = NULL;
retval.size = 0;
}
else if (attr_form_is_section_offset (attr))
@ -15495,7 +15496,6 @@ dwarf2_symbol_mark_computed (struct attribute *attr, struct symbol *sym,
dwarf2_invalid_attrib_class_complaint ("location description",
SYMBOL_NATURAL_NAME (sym));
baton->size = 0;
baton->data = NULL;
}
SYMBOL_COMPUTED_OPS (sym) = &dwarf2_locexpr_funcs;