From f3e033f32a0db3e81266a62b05f867b932a5995b Mon Sep 17 00:00:00 2001 From: Tom de Vries Date: Tue, 29 Nov 2022 22:47:31 +0100 Subject: [PATCH] [gdb/testsuite] Fix gdb.base/vla-optimized-out.exp for ppc64le On powerpc64le-linux, I run into: ... (gdb) PASS: gdb.base/vla-optimized-out.exp: o1: printed optimized out vla p sizeof (a)^M $2 = ^M (gdb) FAIL: gdb.base/vla-optimized-out.exp: o1: \ printed size of optimized out vla ... The problem happens as follows. In order to find the size of the optimized out vla, gdb needs to evaluate: ... <155> DW_AT_upper_bound : 13 byte block: f3 1 53 23 1 8 20 24 8 20 26 31 1c \ (DW_OP_GNU_entry_value: (DW_OP_reg3 (r3)); DW_OP_plus_uconst: 1; DW_OP_const1u: 32; DW_OP_shl; DW_OP_const1u: 32; DW_OP_shra; DW_OP_lit1; DW_OP_minus) ... When trying to evaluate DW_OP_GNU_entry_value, it looks for a call site matching the pc, but doesn't find it: ... $ gdb -q -batch outputs/gdb.base/vla-optimized-out/vla-optimized-out-o1 \ -ex "break f1" -ex run -ex "set debug entry-values 1" -ex "print sizeof (a)" Breakpoint 1 at 0x1000067c: file vla-optimized-out.c, line 34. Breakpoint 1, f1 (i=5) at vla-optimized-out.c:34 34 } DW_OP_entry_value resolving cannot find DW_TAG_call_site 0x100006b0 in main $1 = .... The call site lookup fails because the call site label .LVL4: ... bl f1 # 11 *call_value_nonlocal_aixdi [length = 8] nop .LVL4: ... is not placed directly after the bl insn. This is gcc PR target/107909. However, after manually fixing the .s file we have instead: ... Cannot find matching parameter at DW_TAG_call_site 0x10000690 at main $1 = ... due to the fact that the call site has no call site parameters. The call site does have a reference to the corresponding function f1, with parameter i, for which we find location list entries: ... 0037 1000067c 10000680 (DW_OP_reg3 (r3)) 004a 10000680 10000690 (DW_OP_GNU_entry_value: (DW_OP_reg3 (r3)); DW_OP_stack_value) ... and we could use the fact that the current pc is in the 1000067c-10000680 range, and that that the range starts at the start of the function, to deduce that DW_OP_GNU_entry_value: (DW_OP_reg3 (r3)) == DW_OP_reg3 (r3). But that's a non-trivial enhancement, filed as enhancement PR symtab/29836. Fix this by allowing for target powerpc and the gcc compiler. Reviewed-By: Carl Love Tested-By: Carl Love PR testsuite/29813 Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29813 --- gdb/testsuite/gdb.base/vla-optimized-out.exp | 23 +++++++++++++++----- 1 file changed, 17 insertions(+), 6 deletions(-) diff --git a/gdb/testsuite/gdb.base/vla-optimized-out.exp b/gdb/testsuite/gdb.base/vla-optimized-out.exp index b16142ee329..b897ea8124c 100644 --- a/gdb/testsuite/gdb.base/vla-optimized-out.exp +++ b/gdb/testsuite/gdb.base/vla-optimized-out.exp @@ -67,12 +67,23 @@ proc vla_optimized_out {exe_suffix options} { "print out of range element of vla (0xffffffff)" } -foreach {test_prefix options} \ - { "o1" {{debug optimize=-O1 additional_flags=-DNOCLONE} "6"} \ - "o3" {{debug optimize=-O3} "|6"} \ - "o3_strict" {{debug optimize=-O3 \ - additional_flags=-gstrict-dwarf} \ - "|6"}} { +set o1_sizeof_result "6" +if { [istarget powerpc*-*-*] && [gcc_major_version] != -1 } { + set o1_sizeof_result "|6" +} + +set test_matrix {} +lappend test_matrix \ + "o1" \ + [list {debug optimize=-O1 additional_flags=-DNOCLONE} $o1_sizeof_result] +lappend test_matrix \ + "o3" \ + {{debug optimize=-O3} "|6"} +lappend test_matrix \ + "o3_strict" \ + {{debug optimize=-O3 additional_flags=-gstrict-dwarf} "|6"} + +foreach {test_prefix options} $test_matrix { with_test_prefix $test_prefix { vla_optimized_out $test_prefix $options } -- 2.30.2