http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49578
Summary: Profiling: call graph table overflows on Solaris.
Product: gcc
Version: 4.6.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: other
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: a153...@warme.net
Created attachment 24631
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24631
Patch to increase max num edges in profile call graph under Solaris.
The Solaris implementation of profiling (-pg option) links in a
special gmon.o file that defines the mcount() routine, and related
functions. (On Solaris, mcount() does not reside in libc.so, so
GCC must provide its own implementation.)
This implementation of mcount() creates linked lists of nodes
using an "unsigned short" as the link field to the next node.
This places a hard limit of 65533 edges in the call graph of any
program that is profiled -- a limitation that is easily exceeded
by modern programs.
The attached patch (made to the gcc-4.6.1 distribution) replaces
the pertinent "unsigned short" fields with "unsigned int", and
eliminates the upper bound when dynamically allocating the
"tos" table. This enables profiling of large programs under
Solaris.
David Warme, Ph.D.
Principal Computer Scientist
Group W, Inc.
Fairfax, VA 22031
USA
