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| <h4 class="subsection">13.2.2 <code>tdump</code></h4> |
| |
| <p><a name="index-tdump-744"></a><a name="index-dump-all-data-collected-at-tracepoint-745"></a><a name="index-tracepoint-data_002c-display-746"></a> |
| This command takes no arguments. It prints all the data collected at |
| the current trace snapshot. |
| |
| <pre class="smallexample"> (gdb) <b>trace 444</b> |
| (gdb) <b>actions</b> |
| Enter actions for tracepoint #2, one per line: |
| > collect $regs, $locals, $args, gdb_long_test |
| > end |
| |
| (gdb) <b>tstart</b> |
| |
| (gdb) <b>tfind line 444</b> |
| #0 gdb_test (p1=0x11, p2=0x22, p3=0x33, p4=0x44, p5=0x55, p6=0x66) |
| at gdb_test.c:444 |
| 444 printp( "%s: arguments = 0x%X 0x%X 0x%X 0x%X 0x%X 0x%X\n", ) |
| |
| (gdb) <b>tdump</b> |
| Data collected at tracepoint 2, trace frame 1: |
| d0 0xc4aa0085 -995491707 |
| d1 0x18 24 |
| d2 0x80 128 |
| d3 0x33 51 |
| d4 0x71aea3d 119204413 |
| d5 0x22 34 |
| d6 0xe0 224 |
| d7 0x380035 3670069 |
| a0 0x19e24a 1696330 |
| a1 0x3000668 50333288 |
| a2 0x100 256 |
| a3 0x322000 3284992 |
| a4 0x3000698 50333336 |
| a5 0x1ad3cc 1758156 |
| fp 0x30bf3c 0x30bf3c |
| sp 0x30bf34 0x30bf34 |
| ps 0x0 0 |
| pc 0x20b2c8 0x20b2c8 |
| fpcontrol 0x0 0 |
| fpstatus 0x0 0 |
| fpiaddr 0x0 0 |
| p = 0x20e5b4 "gdb-test" |
| p1 = (void *) 0x11 |
| p2 = (void *) 0x22 |
| p3 = (void *) 0x33 |
| p4 = (void *) 0x44 |
| p5 = (void *) 0x55 |
| p6 = (void *) 0x66 |
| gdb_long_test = 17 '\021' |
| |
| (gdb) |
| </pre> |
| <p><code>tdump</code> works by scanning the tracepoint's current collection |
| actions and printing the value of each expression listed. So |
| <code>tdump</code> can fail, if after a run, you change the tracepoint's |
| actions to mention variables that were not collected during the run. |
| |
| <p>Also, for tracepoints with <code>while-stepping</code> loops, <code>tdump</code> |
| uses the collected value of <code>$pc</code> to distinguish between trace |
| frames that were collected at the tracepoint hit, and frames that were |
| collected while stepping. This allows it to correctly choose whether |
| to display the basic list of collections, or the collections from the |
| body of the while-stepping loop. However, if <code>$pc</code> was not collected, |
| then <code>tdump</code> will always attempt to dump using the basic collection |
| list, and may fail if a while-stepping frame does not include all the |
| same data that is collected at the tracepoint hit. |
| <!-- This is getting pretty arcane, example would be good. --> |
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