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* [Bug jit/103199] New: FAIL: ../jit/docs/examples/tut04-toyvm/toyvm.c, initial compilation
@ 2021-11-11 20:09 msebor at gcc dot gnu.org
2021-11-12 13:21 ` [Bug jit/103199] " cvs-commit at gcc dot gnu.org
2021-11-12 14:12 ` dmalcolm at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: msebor at gcc dot gnu.org @ 2021-11-11 20:09 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103199
Bug ID: 103199
Summary: FAIL: ../jit/docs/examples/tut04-toyvm/toyvm.c,
initial compilation
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: jit
Assignee: dmalcolm at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
A recent regression test run shows FAILs in a couple of JIT example programs,
both due to -Wformat-overflow errors:
/build/gcc-master/gcc/testsuite/jit/jit.log:/src/gcc/master/gcc/testsuite/../jit/docs/examples/tut04-toyvm/toyvm.c:
In function 'toyvm_function_compile':
/build/gcc-master/gcc/testsuite/jit/jit.log:/src/gcc/master/gcc/testsuite/../jit/docs/examples/tut04-toyvm/toyvm.c:565:29:
error: 'sprintf' may write a terminating nul past the end of the destination
[-Werror=format-overflow=]
/build/gcc-master/gcc/testsuite/jit/jit.log:/src/gcc/master/gcc/testsuite/../jit/docs/examples/tut04-toyvm/toyvm.c:565:7:
note: 'sprintf' output between 7 and 17 bytes into a destination of size 16
/build/gcc-master/gcc/testsuite/jit/jit.log:/src/gcc/master/gcc/testsuite/../jit/docs/examples/tut04-toyvm/toyvm.cc:
In member function 'void compilation_state::create_function(const char*)':
/build/gcc-master/gcc/testsuite/jit/jit.log:/src/gcc/master/gcc/testsuite/../jit/docs/examples/tut04-toyvm/toyvm.cc:637:29:
error: 'sprintf' may write a terminating nul past the end of the destination
[-Werror=format-overflow=]
/build/gcc-master/gcc/testsuite/jit/jit.log:/src/gcc/master/gcc/testsuite/../jit/docs/examples/tut04-toyvm/toyvm.cc:637:15:
note: 'sprintf' output between 7 and 17 bytes into a destination of size 16
My best guess is that the recent change to convert the strlen pass away from
EVRP to ranger has enabled the warning thanks to better range info. Looking at
one of the call sites:
/* Create a block per operation. */
for (pc = 0; pc < fn->fn_num_ops; pc++)
{
char buf[16];
sprintf (buf, "instr%i", pc);
state.op_blocks[pc] = gcc_jit_function_new_block (state.fn, buf);
}
the buffer is just big enough to fit the string and a 32-bit nonnegative int.
But pc is a signed int and if its range as determined by ranger includes
negative values the warning will trigger.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug jit/103199] FAIL: ../jit/docs/examples/tut04-toyvm/toyvm.c, initial compilation
2021-11-11 20:09 [Bug jit/103199] New: FAIL: ../jit/docs/examples/tut04-toyvm/toyvm.c, initial compilation msebor at gcc dot gnu.org
@ 2021-11-12 13:21 ` cvs-commit at gcc dot gnu.org
2021-11-12 14:12 ` dmalcolm at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-11-12 13:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103199
--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by David Malcolm <dmalcolm@gcc.gnu.org>:
https://gcc.gnu.org/g:aa1fd30df56d752e3d5a81af409875a1f1e3e327
commit r12-5196-gaa1fd30df56d752e3d5a81af409875a1f1e3e327
Author: David Malcolm <dmalcolm@redhat.com>
Date: Thu Nov 11 18:32:21 2021 -0500
jit: fix -Werror=format-overflow= in testsuite [PR103199]
gcc/jit/ChangeLog:
PR jit/103199
* docs/examples/tut04-toyvm/toyvm.c (toyvm_function_compile):
Increase size of buffer.
* docs/examples/tut04-toyvm/toyvm.cc
(compilation_state::create_function): Likewise.
Signed-off-by: David Malcolm <dmalcolm@redhat.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug jit/103199] FAIL: ../jit/docs/examples/tut04-toyvm/toyvm.c, initial compilation
2021-11-11 20:09 [Bug jit/103199] New: FAIL: ../jit/docs/examples/tut04-toyvm/toyvm.c, initial compilation msebor at gcc dot gnu.org
2021-11-12 13:21 ` [Bug jit/103199] " cvs-commit at gcc dot gnu.org
@ 2021-11-12 14:12 ` dmalcolm at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: dmalcolm at gcc dot gnu.org @ 2021-11-12 14:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103199
David Malcolm <dmalcolm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #2 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Thanks; should be fixed by the above commit.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-11-11 20:09 [Bug jit/103199] New: FAIL: ../jit/docs/examples/tut04-toyvm/toyvm.c, initial compilation msebor at gcc dot gnu.org
2021-11-12 13:21 ` [Bug jit/103199] " cvs-commit at gcc dot gnu.org
2021-11-12 14:12 ` dmalcolm at gcc dot gnu.org
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