• via D.gnu (89/89) Aug 08 2016 http://bugzilla.gdcproject.org/show_bug.cgi?id=235

" via D.gnu" <d.gnu puremagic.com> writes:

http://bugzilla.gdcproject.org/show_bug.cgi?id=235

            Bug ID: 235
           Summary: ICE with array slice assign on 32 bit
           Product: GDC
           Version: development
          Hardware: x86
                OS: All
            Status: NEW
          Severity: major
          Priority: Normal
         Component: gdc
          Assignee: ibuclaw gdcproject.org
          Reporter: johannespfau gmail.com

Found on ARM, reproducible on x86 (32bit) as well:


char[] func1()
{
    return [];
}

void test1()
{
    func1()[] = 'y';
}
gdc -c test7.d -m32

In d_build_call CALL_EXPR_RETURN_SLOT_OPT is set on 32 bit targets only and
build_target_expr is called. in ExprVisitor::AssignExp we call d_save_expr on
the result. For 32 bit targets is_lvalue_p returns true, as we have a
TARGET_EXPR and not CALL_EXPR. Because of that we don't create a SAVE_EXPR. The
codegen then somehow recursively accesses some expressions which causes the
error below. Also "gdc -c test7.d -m32 -fdump-tree-original" does not work and
enters an infinite loop.

---------------------------------------------------------
test7.d: In function 'test1':
test7.d:8:5: internal compiler error: in gimple_add_tmp_var, at gimplify.c:703
     func1()[] = 'y';
     ^
0x9d16b9 gimple_add_tmp_var(tree_node*)
        ../../gcc-7-20160619/gcc/gimplify.c:703
0x9d9867 gimplify_target_expr
        ../../gcc-7-20160619/gcc/gimplify.c:5688
0x9d9867 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../gcc-7-20160619/gcc/gimplify.c:10803
0x9deb03 gimplify_compound_lval
        ../../gcc-7-20160619/gcc/gimplify.c:2195
0x9d5d4a gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../gcc-7-20160619/gcc/gimplify.c:10386
0x9e8cfa gimplify_modify_expr
        ../../gcc-7-20160619/gcc/gimplify.c:4798
0x9d7b8a gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../gcc-7-20160619/gcc/gimplify.c:10434
0x9daee6 gimplify_stmt(tree_node**, gimple**)
        ../../gcc-7-20160619/gcc/gimplify.c:5767
0x9d5e9b gimplify_statement_list
        ../../gcc-7-20160619/gcc/gimplify.c:1549
0x9d5e9b gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../gcc-7-20160619/gcc/gimplify.c:10851
0x9daee6 gimplify_stmt(tree_node**, gimple**)
        ../../gcc-7-20160619/gcc/gimplify.c:5767
0x9dc135 gimplify_bind_expr
        ../../gcc-7-20160619/gcc/gimplify.c:1154
0x9d8045 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../gcc-7-20160619/gcc/gimplify.c:10633
0x9daee6 gimplify_stmt(tree_node**, gimple**)
        ../../gcc-7-20160619/gcc/gimplify.c:5767
0x9dbb01 gimplify_compound_expr
        ../../gcc-7-20160619/gcc/gimplify.c:5029
0x9e1ba7 gimplify_modify_expr_rhs
        ../../gcc-7-20160619/gcc/gimplify.c:4407
0x9e8b39 gimplify_modify_expr
        ../../gcc-7-20160619/gcc/gimplify.c:4757
0x9d7b8a gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../gcc-7-20160619/gcc/gimplify.c:10434
0x9d7cce gimplify_target_expr
        ../../gcc-7-20160619/gcc/gimplify.c:5698
0x9d7cce gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../gcc-7-20160619/gcc/gimplify.c:10803
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://bugzilla.gdcproject.org> for instructions.

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