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* [Bug symtab/29779] New: ptype/o versus unions
@ 2022-11-12 17:48 tromey at sourceware dot org
0 siblings, 0 replies; only message in thread
From: tromey at sourceware dot org @ 2022-11-12 17:48 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=29779
Bug ID: 29779
Summary: ptype/o versus unions
Product: gdb
Version: HEAD
Status: NEW
Severity: normal
Priority: P2
Component: symtab
Assignee: unassigned at sourceware dot org
Reporter: tromey at sourceware dot org
Target Milestone: ---
ptype/o prints strange padding for a union.
You can see this in gdb itself using "ptype/o struct value".
This struct has a union:
/* 8 | 40 */ union {
/* 8 */ CORE_ADDR address;
/* 40 */ struct {
/* 8 | 4 */ int regnum;
/* XXX 4-byte hole */
/* 16 | 32 */ struct frame_id {
/* 16 | 8 */ CORE_ADDR stack_addr;
/* 24 | 8 */ CORE_ADDR code_addr;
/* 32 | 8 */ CORE_ADDR special_addr;
/* 40: 0 | 4 */ frame_id_stack_status stack_status :
3;
/* 40: 3 | 4 */ unsigned int code_addr_p : 1;
/* 40: 4 | 4 */ unsigned int special_addr_p : 1;
/* XXX 3-bit hole */
/* XXX 3-byte hole */
/* 44 | 4 */ int artificial_depth;
/* total size (bytes): 32 */
} next_frame_id;
/* total size (bytes): 40 */
} reg;
/* 8 */ internalvar *internalvar;
/* 8 */ xmethod_worker *xm_worker;
/* 16 */ struct {
/* 8 | 8 */ const lval_funcs *funcs;
/* 16 | 8 */ void *closure;
/* total size (bytes): 16 */
} computed;
/* XXX 32-byte padding */
/* total size (bytes): 40 */
} location;
I'm not sure what the "32-byte padding" refers to -- maybe the maximum
padding of all union members?
Anyway it would probably be more useful to see the amount of padding
per-member, and then if the maximum were shown, the comment could
explain that explicitly.
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2022-11-12 17:48 [Bug symtab/29779] New: ptype/o versus unions tromey at sourceware dot org
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