[gdb/symtab] Fix skipping of import of C++ CU
authorTom de Vries <tdevries@suse.de>
Tue, 6 Jul 2021 08:58:43 +0000 (10:58 +0200)
committerTom de Vries <tdevries@suse.de>
Tue, 6 Jul 2021 08:58:43 +0000 (10:58 +0200)
Tom Tromey observed that when changing the language in
gdb.dwarf2/imported-unit-bp.exp from c to c++, the test failed.

This is due to this code in process_imported_unit_die:
...
      /* We're importing a C++ compilation unit with tag DW_TAG_compile_unit
         into another compilation unit, at root level.  Regard this as a hint,
         and ignore it.  */
      if (die->parent && die->parent->parent == NULL
          && per_cu->unit_type == DW_UT_compile
          && per_cu->lang == language_cplus)
        return;
...
which should have a partial symtabs counterpart.

Add the missing counterpart in process_psymtab_comp_unit.

Tested on x86_64-linux (openSUSE Leap 15.2), no regressions for config:
- using default gcc version 7.5.0
  (with 5 unexpected FAILs)
- gcc 10.3.0 and target board
  unix/-flto/-O0/-flto-partition=none/-ffat-lto-objects
  (with 1000 unexpected FAILs)

gdb/ChangeLog:

2021-07-06  Tom de Vries  <tdevries@suse.de>

* dwarf2/read.c (scan_partial_symbols): Skip top-level imports of
c++ CU.
* testsuite/gdb.dwarf2/imported-unit-bp.exp: Moved to ...
* testsuite/gdb.dwarf2/imported-unit-bp.exp.tcl: ... here.
* testsuite/gdb.dwarf2/imported-unit-bp-c++.exp: New test.
* testsuite/gdb.dwarf2/imported-unit-bp-c.exp: New test.
* testsuite/gdb.dwarf2/imported-unit.exp: Update.

gdb/ChangeLog
gdb/dwarf2/read.c
gdb/testsuite/gdb.dwarf2/imported-unit-bp-c++.exp [new file with mode: 0644]
gdb/testsuite/gdb.dwarf2/imported-unit-bp-c.exp [new file with mode: 0644]
gdb/testsuite/gdb.dwarf2/imported-unit-bp.exp [deleted file]
gdb/testsuite/gdb.dwarf2/imported-unit-bp.exp.tcl [new file with mode: 0644]
gdb/testsuite/gdb.dwarf2/imported-unit.exp

index f7a6ccc6d9ef89198e3f3d127367cafb7e18ed33..f1071a71d2e09c79ce21ffaf2a5ffae9cd88803e 100644 (file)
@@ -1,3 +1,13 @@
+2021-07-06  Tom de Vries  <tdevries@suse.de>
+
+       * dwarf2/read.c (scan_partial_symbols): Skip top-level imports of
+       c++ CU.
+       * testsuite/gdb.dwarf2/imported-unit-bp.exp: Moved to ...
+       * testsuite/gdb.dwarf2/imported-unit-bp.exp.tcl: ... here.
+       * testsuite/gdb.dwarf2/imported-unit-bp-c++.exp: New test.
+       * testsuite/gdb.dwarf2/imported-unit-bp-c.exp: New test.
+       * testsuite/gdb.dwarf2/imported-unit.exp: Update.
+
 2021-07-03  Joel Brobecker  <brobecker@adacore.com>
 
        * NEWS: Create a new section for the next release branch.
index fe82175990e438c23b5f42f094095f19abf996fa..a13a53ebc46f58b130a443a1164b5d2b2ceee411 100644 (file)
@@ -7639,6 +7639,13 @@ scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
                  process_psymtab_comp_unit (per_cu, cu->per_objfile, true,
                                             cu->per_cu->lang);
 
+               if (pdi->die_parent == nullptr
+                   && per_cu->unit_type == DW_UT_compile
+                   && per_cu->lang == language_cplus)
+                 /* Regard import as hint.  See corresponding code in
+                    process_imported_unit_die.  */
+                 break;
+
                cu->per_cu->imported_symtabs_push (per_cu);
              }
              break;
diff --git a/gdb/testsuite/gdb.dwarf2/imported-unit-bp-c++.exp b/gdb/testsuite/gdb.dwarf2/imported-unit-bp-c++.exp
new file mode 100644 (file)
index 0000000..c376113
--- /dev/null
@@ -0,0 +1,18 @@
+# Copyright 2021 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+set lang DW_LANG_C_plus_plus
+
+source $srcdir/$subdir/imported-unit-bp.exp.tcl
diff --git a/gdb/testsuite/gdb.dwarf2/imported-unit-bp-c.exp b/gdb/testsuite/gdb.dwarf2/imported-unit-bp-c.exp
new file mode 100644 (file)
index 0000000..6f9c3ad
--- /dev/null
@@ -0,0 +1,18 @@
+# Copyright 2021 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+set lang DW_LANG_C
+
+source $srcdir/$subdir/imported-unit-bp.exp.tcl
diff --git a/gdb/testsuite/gdb.dwarf2/imported-unit-bp.exp b/gdb/testsuite/gdb.dwarf2/imported-unit-bp.exp
deleted file mode 100644 (file)
index b6a0f25..0000000
+++ /dev/null
@@ -1,128 +0,0 @@
-# Copyright 2020-2021 Free Software Foundation, Inc.
-
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-# Test that "break /absolute/file:line" works ok with imported CUs.
-
-load_lib dwarf.exp
-
-# This test can only be run on targets which support DWARF-2 and use gas.
-if {![dwarf2_support]} {
-    return 0
-}
-
-# The .c files use __attribute__.
-if [get_compiler_info] {
-    return -1
-}
-if !$gcc_compiled {
-    return 0
-}
-
-standard_testfile imported-unit-bp-alt.c .S imported-unit-bp-main.c
-
-set build_options {nodebug optimize=-O1}
-
-set asm_file [standard_output_file $srcfile2]
-Dwarf::assemble $asm_file {
-    global srcdir subdir srcfile srcfile
-    global build_options
-    declare_labels lines_label callee_subprog_label cu_label
-
-    get_func_info func "$build_options additional_flags=-DWITHMAIN"
-
-    cu {} {
-       compile_unit {
-           {language @DW_LANG_C}
-           {name "<artificial>"}
-       } {
-           imported_unit {
-               {import %$cu_label}
-           }
-       }
-    }
-
-    cu {} {
-       cu_label: compile_unit {
-           {producer "gcc"}
-           {language @DW_LANG_C}
-           {name ${srcfile}}
-           {comp_dir "/tmp"}
-           {low_pc 0 addr}
-           {stmt_list ${lines_label} DW_FORM_sec_offset}
-       } {
-           callee_subprog_label: subprogram {
-               {external 1 flag}
-               {name callee}
-               {inline 3 data1}
-           }
-           subprogram {
-               {external 1 flag}
-               {name func}
-               {low_pc $func_start addr}
-               {high_pc "$func_start + $func_len" addr}
-           } {
-           }
-       }
-    }
-
-    lines {version 2 default_is_stmt 1} lines_label {
-       include_dir "/tmp"
-       file_name "$srcfile" 1
-
-       program {
-           {DW_LNE_set_address line_label_1}
-           {DW_LNS_advance_line 15}
-           {DW_LNS_copy}
-
-           {DW_LNE_set_address line_label_2}
-           {DW_LNS_advance_line 1}
-           {DW_LNS_copy}
-
-           {DW_LNE_set_address line_label_3}
-           {DW_LNS_advance_line 4}
-           {DW_LNS_copy}
-
-           {DW_LNE_set_address line_label_4}
-           {DW_LNS_advance_line 1}
-           {DW_LNS_copy}
-
-           {DW_LNS_advance_line -4}
-           {DW_LNS_negate_stmt}
-           {DW_LNS_copy}
-
-           {DW_LNE_set_address line_label_5}
-           {DW_LNS_advance_line 1}
-           {DW_LNS_copy}
-
-           {DW_LNE_set_address line_label_6}
-           {DW_LNS_advance_line 1}
-           {DW_LNS_negate_stmt}
-           {DW_LNS_copy}
-
-           {DW_LNE_set_address line_label_7}
-           {DW_LNE_end_sequence}
-       }
-    }
-}
-
-if { [prepare_for_testing "failed to prepare" ${testfile} \
-         [list $srcfile $asm_file $srcfile3] $build_options] } {
-    return -1
-}
-
-gdb_reinitialize_dir /tmp
-
-# Using an absolute path is important to see the bug.
-gdb_test "break /tmp/${srcfile}:19" "Breakpoint .* file $srcfile, line .*"
diff --git a/gdb/testsuite/gdb.dwarf2/imported-unit-bp.exp.tcl b/gdb/testsuite/gdb.dwarf2/imported-unit-bp.exp.tcl
new file mode 100644 (file)
index 0000000..83bca7d
--- /dev/null
@@ -0,0 +1,129 @@
+# Copyright 2020-2021 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Test that "break /absolute/file:line" works ok with imported CUs.
+
+load_lib dwarf.exp
+
+# This test can only be run on targets which support DWARF-2 and use gas.
+if {![dwarf2_support]} {
+    return 0
+}
+
+# The .c files use __attribute__.
+if [get_compiler_info] {
+    return -1
+}
+if !$gcc_compiled {
+    return 0
+}
+
+standard_testfile imported-unit-bp-alt.c .S imported-unit-bp-main.c
+
+set build_options {nodebug optimize=-O1}
+
+set asm_file [standard_output_file $srcfile2]
+Dwarf::assemble $asm_file {
+    global srcdir subdir srcfile srcfile
+    global build_options
+    global lang
+    declare_labels lines_label callee_subprog_label cu_label
+
+    get_func_info func "$build_options additional_flags=-DWITHMAIN"
+
+    cu {} {
+       compile_unit {
+           {language @$lang}
+           {name "<artificial>"}
+       } {
+           imported_unit {
+               {import %$cu_label}
+           }
+       }
+    }
+
+    cu {} {
+       cu_label: compile_unit {
+           {producer "gcc"}
+           {language @$lang}
+           {name ${srcfile}}
+           {comp_dir "/tmp"}
+           {low_pc 0 addr}
+           {stmt_list ${lines_label} DW_FORM_sec_offset}
+       } {
+           callee_subprog_label: subprogram {
+               {external 1 flag}
+               {name callee}
+               {inline 3 data1}
+           }
+           subprogram {
+               {external 1 flag}
+               {name func}
+               {low_pc $func_start addr}
+               {high_pc "$func_start + $func_len" addr}
+           } {
+           }
+       }
+    }
+
+    lines {version 2 default_is_stmt 1} lines_label {
+       include_dir "/tmp"
+       file_name "$srcfile" 1
+
+       program {
+           {DW_LNE_set_address line_label_1}
+           {DW_LNS_advance_line 15}
+           {DW_LNS_copy}
+
+           {DW_LNE_set_address line_label_2}
+           {DW_LNS_advance_line 1}
+           {DW_LNS_copy}
+
+           {DW_LNE_set_address line_label_3}
+           {DW_LNS_advance_line 4}
+           {DW_LNS_copy}
+
+           {DW_LNE_set_address line_label_4}
+           {DW_LNS_advance_line 1}
+           {DW_LNS_copy}
+
+           {DW_LNS_advance_line -4}
+           {DW_LNS_negate_stmt}
+           {DW_LNS_copy}
+
+           {DW_LNE_set_address line_label_5}
+           {DW_LNS_advance_line 1}
+           {DW_LNS_copy}
+
+           {DW_LNE_set_address line_label_6}
+           {DW_LNS_advance_line 1}
+           {DW_LNS_negate_stmt}
+           {DW_LNS_copy}
+
+           {DW_LNE_set_address line_label_7}
+           {DW_LNE_end_sequence}
+       }
+    }
+}
+
+if { [prepare_for_testing "failed to prepare" ${testfile} \
+         [list $srcfile $asm_file $srcfile3] $build_options] } {
+    return -1
+}
+
+gdb_reinitialize_dir /tmp
+
+# Using an absolute path is important to see the bug.
+gdb_test "break /tmp/${srcfile}:19" "Breakpoint .* file $srcfile, line .*"
index 2bd72a60f40e5e075ae3c958b1b432d65a963651..efce3a03a2ea3867bddb2e04b9d31c4e88cee53f 100644 (file)
@@ -136,15 +136,14 @@ gdb_test_no_output "set language c++"
 
 set psymtabs_p [psymtabs_p]
 
-# Verify that the partial symtab for the unit importing the partial unit does
-# not contain the static partial symbol int, which is defined in the partial
-# unit.  Test-case for PR25646.
+# Verify that the partial symtab for CU "<artificial>" does
+# not contain the static partial symbol int, which is defined in the
+# CU "imported_unit.c".  Test-case for PR25646.
 set test "no static partial symbols in importing unit"
 if { $psymtabs_p } {
     gdb_test "main print psymbols" \
        [multi_line \
-            "  Depends on 1 other partial symtabs\." \
-            "\[^\r\n\]*" \
+        "  Depends on 0 other partial symtabs\." \
             "  Global partial symbols:" \
             "    `main', function, $hex" \
             "" \