Author: Maciej Fijalkowski <fij...@gmail.com>
Branch: vmprof
Changeset: r76559:8e77be4b6db3
Date: 2015-03-25 16:08 +0200
http://bitbucket.org/pypy/pypy/changeset/8e77be4b6db3/
Log: add a comment why we need to do -1
diff --git a/pypy/module/_vmprof/src/vmprof.c b/pypy/module/_vmprof/src/vmprof.c
--- a/pypy/module/_vmprof/src/vmprof.c
+++ b/pypy/module/_vmprof/src/vmprof.c
@@ -107,6 +107,9 @@
unw_get_reg (cp, UNW_REG_IP, (unw_word_t*)&ip);
unw_get_reg (cp, UNW_REG_SP, (unw_word_t*)&sp);
if (!first_run)
+ // make sure we're pointing to the CALL and not to the first
+ // instruction after. If the callee adjusts the stack for us
+ // it's not safe to be at the instruction after
ip -= 1;
sp_offset = vmprof_unw_get_custom_offset(ip, cp);
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