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Stop unwinding on undefined return address

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Milian Wolff <mail@milianw.de> reported that this greatly
improved unwinding perf on some his apps.
This commit is contained in:
Arun Sharma 2014-09-07 02:55:07 -07:00
parent 4791a76d26
commit 0808aa6737
1 changed files with 7 additions and 6 deletions
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5
src/x86_64/Gstep.c
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@ -83,8 +83,9 @@ unw_step (unw_cursor_t *cursor)
if (likely (ret >= 0)) if (likely (ret >= 0))
{ {
/* x86_64 ABI specifies that end of call-chain is marked with a /* x86_64 ABI specifies that end of call-chain is marked with a
NULL RBP. */ NULL RBP or undefined return address */
if (DWARF_IS_NULL_LOC (c->dwarf.loc[RBP])) if (DWARF_IS_NULL_LOC (c->dwarf.loc[RBP])
|| DWARF_IS_NULL_LOC(c->dwarf.loc[c->dwarf.ret_addr_column]))
{ {
c->dwarf.ip = 0; c->dwarf.ip = 0;
ret = 0; ret = 0;