[Bug middle-end/78629] New: vec.h: null pointer passed as argument 1, which is declared to never be null

[prathamesh3492 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78629

            Bug ID: 78629
           Summary: vec.h: null pointer passed as argument 1, which is
                    declared to never be null
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: prathamesh3492 at gcc dot gnu.org
  Target Milestone: ---

build/genmatch --gimple match.pd gives following runtime error when
it's built with ubsan:

../../gcc/gcc/vec.h:1609:3: runtime error: null pointer passed as argument 1,
which is declared to never be null
/usr/include/x86_64-linux-gnu/bits/string3.h:90:70: runtime error: null pointer
passed as argument 1, which is declared to never be null
GIMPLE decision tree has 1846 leafs, maximum depth 12 and a total number of
7248 nodes
removed 1070 duplicate tails

../../gcc/gcc/vec.h:1609:3: runtime error: null pointer passed as argument 1,
which is declared to never be null
    #0 0x44fb51 in vec<vec<capture*, va_heap, vl_ptr>, va_heap,
vl_ptr>::safe_grow_cleared(unsigned int) ../../gcc/gcc/vec.h:1609
    #1 0x44fb51 in parser::finish_match_operand(operand*)
../../gcc/gcc/genmatch.c:4801
    #2 0x45d597 in parser::parse_simplify(simplify::simplify_kind,
vec<simplify*, va_heap, vl_ptr>&, predicate_id*, operand*)
../../gcc/gcc/genmatch.c:4433
    #3 0x45e70b in parser::parse_pattern() ../../gcc/gcc/genmatch.c:4745
    #4 0x466213 in parser::parser(cpp_reader*) ../../gcc/gcc/genmatch.c:4855
    #5 0x40a899 in main ../../gcc/gcc/genmatch.c:4953
    #6 0x7fafc65e982f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #7 0x40bbd8 in _start
(/home/bilbo/gnu-toolchain/gcc/master/ubsan-stage1-build/gcc/build/genmatch+0x40bbd8)

Thanks,
Prathamesh