https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64920
Bug ID: 64920
Summary: bootstrap-ubsan [build/gengtype -r gtype.state]:
libiberty/regex.c:6970:11: runtime error: left shift
of negative value -1
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: burnus at gcc dot gnu.org
Depends on: 63426
Running bootstrap-ubsan on x86_64 shows the following error during stage 2 for
build/gengtype -r gtype.state
../../libiberty/regex.c:6970:11: runtime error: left shift of negative value -1
../../libiberty/regex.c:7165:4: runtime error: left shift of negative value -1
The debugger shows:
Breakpoint 3, byte_re_match_2_internal (bufp=bufp@entry=0x7fffffffda70,
string1=string1@entry=0x0, size1=size1@entry=0, string2=string2@entry=0x93773d
"../../gcc/objc/objc-next-runtime-abi-02.c", size2=size2@entry=41,
pos=pos@entry=0, regs=0x7fffffffda50, stop=41)
at ../../libiberty/regex.c:6970
6970 EXTRACT_NUMBER_AND_INCR (mcnt, p);
(gdb) p p
$3 = (unsigned char *) 0xb80116 "\362\377\002\001/\a\002"
(gdb) p mcnt
$4 = <optimized out>
(gdb) bt
#0 byte_re_match_2_internal (bufp=bufp@entry=0x7fffffffda70,
string1=string1@entry=0x0, size1=size1@entry=0, string2=string2@entry=0x93773d
"../../gcc/objc/objc-next-runtime-abi-02.c", size2=size2@entry=41,
pos=pos@entry=0, regs=0x7fffffffda50, stop=41)
at ../../libiberty/regex.c:6970
#1 0x0000000000439f63 in byte_re_search_2 (bufp=bufp@entry=0x7fffffffda70,
string1=string1@entry=0x0, size1=size1@entry=0, string2=string2@entry=0x93773d
"../../gcc/objc/objc-next-runtime-abi-02.c", size2=size2@entry=41,
startpos=startpos@entry=0, range=1,
regs=0x7fffffffda50, stop=41) at ../../libiberty/regex.c:5208
#2 0x00000000004442e8 in xre_search_2 (stop=<optimized out>, regs=<optimized
out>, range=<optimized out>, startpos=0, size2=<optimized out>,
string2=0x93773d "../../gcc/objc/objc-next-runtime-abi-02.c", size1=0,
string1=0x0, bufp=<optimized out>)
at ../../libiberty/regex.c:4961
#3 xre_search (regs=<optimized out>, range=<optimized out>, startpos=0,
size=<optimized out>, string=0x93773d
"../../gcc/objc/objc-next-runtime-abi-02.c", bufp=<optimized out>) at
../../libiberty/regex.c:4921
#4 xregexec (preg=0xb87f80, string=0x93773d
"../../gcc/objc/objc-next-runtime-abi-02.c", nmatch=10, pmatch=0x7fffffffdb30,
eflags=<optimized out>) at ../../libiberty/regex.c:8036
#5 0x0000000000413a29 in get_output_file_with_visibility (inpf=0x937730) at
../../gcc/gengtype.c:2221
#6 0x000000000041a148 in write_func_for_structure (orig_s=0x9377b0,
s=0x9377b0, wtd=0x4743e0 <ggc_wtd>) at ../../gcc/gengtype.c:3512
#7 0x000000000041b80c in write_types (output_header=<optimized out>,
structures=<optimized out>, wtd=0x4743e0 <ggc_wtd>) at
../../gcc/gengtype.c:3786
#8 0x0000000000404acd in main (argc=<optimized out>, argv=<optimized out>) at
../../gcc/gengtype.c:5368
