gdb/
authorJan Kratochvil <jan.kratochvil@redhat.com>
Fri, 1 Jul 2011 19:12:12 +0000 (19:12 +0000)
committerJan Kratochvil <jan.kratochvil@redhat.com>
Fri, 1 Jul 2011 19:12:12 +0000 (19:12 +0000)
* dwarf2read.c (check_physname): New variable.
(dwarf2_physname): Prefer DW_AT_linkage_name over dwarf2_compute_name.
(show_check_physname): New function.
(_initialize_dwarf2_read): Add `check-physname' for check_physname.

gdb/doc/
* gdb.texinfo (Debugging Output): Document set debug
check-physname.

gdb/testsuite/
* gdb.base/break-interp.exp (reach_1, test_ld): Allow also the prefix
__GI_.
* gdb.cp/psymtab-parameter.cc (func): Make it a template function.
(f): New function.
* gdb.cp/psymtab-parameter.exp (complete break 'func(): Rename to ...
(complete p 'func<short>(): ... here.
* gdb.dwarf2/dw2-linkage-name-trust-main.cc: New file.
* gdb.dwarf2/dw2-linkage-name-trust.S: New file.
* gdb.dwarf2/dw2-linkage-name-trust.exp: New file.
* gdb.cp/temargs.exp (test type of F in k3_m, test value of F in k3_m):
Make them KFAIL gcc/49546.

12 files changed:
gdb/ChangeLog
gdb/doc/ChangeLog
gdb/doc/gdb.texinfo
gdb/dwarf2read.c
gdb/testsuite/ChangeLog
gdb/testsuite/gdb.base/break-interp.exp
gdb/testsuite/gdb.cp/psymtab-parameter.cc
gdb/testsuite/gdb.cp/psymtab-parameter.exp
gdb/testsuite/gdb.cp/temargs.exp
gdb/testsuite/gdb.dwarf2/dw2-linkage-name-trust-main.cc [new file with mode: 0644]
gdb/testsuite/gdb.dwarf2/dw2-linkage-name-trust.S [new file with mode: 0644]
gdb/testsuite/gdb.dwarf2/dw2-linkage-name-trust.exp [new file with mode: 0644]

index f983726..dda582d 100644 (file)
@@ -1,3 +1,11 @@
+2011-07-01  Jan Kratochvil  <jan.kratochvil@redhat.com>
+           Tom Tromey  <tromey@redhat.com>
+
+       * dwarf2read.c (check_physname): New variable.
+       (dwarf2_physname): Prefer DW_AT_linkage_name over dwarf2_compute_name.
+       (show_check_physname): New function.
+       (_initialize_dwarf2_read): Add `check-physname' for check_physname.
+
 2011-07-01  Joel Brobecker  <brobecker@adacore.com>
 
        * machoread.c (macho_symfile_read): Delete OBE comment.
index 12404f8..8595419 100644 (file)
@@ -1,3 +1,8 @@
+2011-07-01  Tom Tromey  <tromey@redhat.com>
+
+       * gdb.texinfo (Debugging Output): Document set debug
+       check-physname.
+
 2011-06-29  Tom Tromey  <tromey@redhat.com>
 
        * gdb.texinfo (GDB/MI Miscellaneous Commands): Document
index 046bf54..dbaf30e 100644 (file)
@@ -20027,6 +20027,16 @@ Display debugging messages about inner workings of the AIX thread
 module.
 @item show debug aix-thread
 Show the current state of AIX thread debugging info display.
+@item set debug check-physname
+@cindex physname
+Check the results of the ``physname'' computation.  When reading DWARF
+debugging information for C@t{++}, @value{GDBN} attempts to compute
+each entity's name.  @value{GDBN} can do this computation in two
+different ways, depending on exactly what information is present.
+When enabled, this setting causes @value{GDBN} to compute the names
+both ways and display any discrepancies.
+@item show debug check-physname
+Show the current state of ``physname'' checking.
 @item set debug dwarf2-die
 @cindex DWARF2 DIEs
 Dump DWARF2 DIEs after they are read in.
index e078c62..3ffe1ee 100644 (file)
@@ -119,6 +119,9 @@ _STATEMENT_PROLOGUE;
 /* When non-zero, dump DIEs after they are read in.  */
 static int dwarf2_die_debug = 0;
 
+/* When non-zero, cross-check physname against demangler.  */
+static int check_physname = 0;
+
 static int pagesize;
 
 /* When set, the file that we're processing is known to have debugging
@@ -5180,7 +5183,91 @@ dwarf2_full_name (char *name, struct die_info *die, struct dwarf2_cu *cu)
 static const char *
 dwarf2_physname (char *name, struct die_info *die, struct dwarf2_cu *cu)
 {
-  return dwarf2_compute_name (name, die, cu, 1);
+  struct attribute *attr;
+  const char *retval, *mangled = NULL, *canon = NULL;
+  struct cleanup *back_to;
+  int need_copy = 1;
+
+  /* In this case dwarf2_compute_name is just a shortcut not building anything
+     on its own.  */
+  if (!die_needs_namespace (die, cu))
+    return dwarf2_compute_name (name, die, cu, 1);
+
+  back_to = make_cleanup (null_cleanup, NULL);
+
+  attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
+  if (!attr)
+    attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
+
+  /* DW_AT_linkage_name is missing in some cases - depend on what GDB
+     has computed.  */
+  if (attr && DW_STRING (attr))
+    {
+      char *demangled;
+
+      mangled = DW_STRING (attr);
+
+      /* Use DMGL_RET_DROP for C++ template functions to suppress their return
+        type.  It is easier for GDB users to search for such functions as
+        `name(params)' than `long name(params)'.  In such case the minimal
+        symbol names do not match the full symbol names but for template
+        functions there is never a need to look up their definition from their
+        declaration so the only disadvantage remains the minimal symbol
+        variant `long name(params)' does not have the proper inferior type.
+        */
+
+      demangled = cplus_demangle (mangled, (DMGL_PARAMS | DMGL_ANSI
+                                           | (cu->language == language_java
+                                              ? DMGL_JAVA | DMGL_RET_POSTFIX
+                                              : DMGL_RET_DROP)));
+      if (demangled)
+       {
+         make_cleanup (xfree, demangled);
+         canon = demangled;
+       }
+      else
+       {
+         canon = mangled;
+         need_copy = 0;
+       }
+    }
+
+  if (canon == NULL || check_physname)
+    {
+      const char *physname = dwarf2_compute_name (name, die, cu, 1);
+
+      if (canon != NULL && strcmp (physname, canon) != 0)
+       {
+         /* It may not mean a bug in GDB.  The compiler could also
+            compute DW_AT_linkage_name incorrectly.  But in such case
+            GDB would need to be bug-to-bug compatible.  */
+
+         complaint (&symfile_complaints,
+                    _("Computed physname <%s> does not match demangled <%s> "
+                      "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
+                    physname, canon, mangled, die->offset, cu->objfile->name);
+
+         /* Prefer DW_AT_linkage_name (in the CANON form) - when it
+            is available here - over computed PHYSNAME.  It is safer
+            against both buggy GDB and buggy compilers.  */
+
+         retval = canon;
+       }
+      else
+       {
+         retval = physname;
+         need_copy = 0;
+       }
+    }
+  else
+    retval = canon;
+
+  if (need_copy)
+    retval = obsavestring (retval, strlen (retval),
+                          &cu->objfile->objfile_obstack);
+
+  do_cleanups (back_to);
+  return retval;
 }
 
 /* Read the import statement specified by the given die and record it.  */
@@ -16254,6 +16341,15 @@ show_dwarf2_always_disassemble (struct ui_file *file, int from_tty,
                    value);
 }
 
+static void
+show_check_physname (struct ui_file *file, int from_tty,
+                    struct cmd_list_element *c, const char *value)
+{
+  fprintf_filtered (file,
+                   _("Whether to check \"physname\" is %s.\n"),
+                   value);
+}
+
 void _initialize_dwarf2_read (void);
 
 void
@@ -16309,6 +16405,14 @@ The value is the maximum depth to print."),
                            NULL,
                            &setdebuglist, &showdebuglist);
 
+  add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
+Set cross-checking of \"physname\" code against demangler."), _("\
+Show cross-checking of \"physname\" code against demangler."), _("\
+When enabled, GDB's internal \"physname\" code is checked against\n\
+the demangler."),
+                          NULL, show_check_physname,
+                          &setdebuglist, &showdebuglist);
+
   c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
               _("\
 Save a gdb-index file.\n\
index 6f84e43..d61fd86 100644 (file)
@@ -1,3 +1,17 @@
+2011-05-24  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+       * gdb.base/break-interp.exp (reach_1, test_ld): Allow also the prefix
+       __GI_.
+       * gdb.cp/psymtab-parameter.cc (func): Make it a template function.
+       (f): New function.
+       * gdb.cp/psymtab-parameter.exp (complete break 'func(): Rename to ...
+       (complete p 'func<short>(): ... here.
+       * gdb.dwarf2/dw2-linkage-name-trust-main.cc: New file.
+       * gdb.dwarf2/dw2-linkage-name-trust.S: New file.
+       * gdb.dwarf2/dw2-linkage-name-trust.exp: New file.
+       * gdb.cp/temargs.exp (test type of F in k3_m, test value of F in k3_m):
+       Make them KFAIL gcc/49546.
+
 2011-07-01  Joel Brobecker  <brobecker@adacore.com>
 
        * gdb.ada/catch_ex.exp: Add temporary catchpoint tests.
index 08a65cd..47a6f8c 100644 (file)
@@ -140,14 +140,14 @@ proc reach_1 {func command displacement} {
            }
            exp_continue
        }
-       -re "Breakpoint \[0-9\]+, \\.?$func \\(.*\\) at .*:\[0-9\]+\r\n.*$gdb_prompt $" {
+       -re "Breakpoint \[0-9\]+, \\.?(__GI_)?$func \\(.*\\) at .*:\[0-9\]+\r\n.*$gdb_prompt $" {
            if {$func == "_dl_debug_state"} {
                fail $test
            } else {
                pass $test
            }
        }
-       -re "Breakpoint \[0-9\]+, \[0-9xa-f\]+ in \\.?$func \\(\\).*\r\n$gdb_prompt $" {
+       -re "Breakpoint \[0-9\]+, \[0-9xa-f\]+ in \\.?(__GI_)?$func \\(\\).*\r\n$gdb_prompt $" {
            if {$func == "_dl_debug_state"} {
                fail $test
            } else {
@@ -403,7 +403,7 @@ proc test_ld {file ifmain trynosym displacement} {
 
     reach "_dl_debug_state" "run" $displacement
 
-    gdb_test "bt" "#0 +\[^\r\n\]*\\m_dl_debug_state\\M.*" "dl bt"
+    gdb_test "bt" "#0 +\[^\r\n\]*\\m(__GI_)?_dl_debug_state\\M.*" "dl bt"
 
     if $ifmain {
        reach "main" continue "NONE"
index a578c88..c2647d8 100644 (file)
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
    */
 
-typedef int typedefed;
-void func (typedefed param)
+template <typename T>
+long
+func ()
 {
 }
+
+void
+f ()
+{
+  func<short> ();
+}
index 7032239..ff421b2 100644 (file)
@@ -35,5 +35,6 @@ gdb_test_no_output "set language c++"
 # XFAIL than FAIL here.  For example -readnow breaks it.
 gdb_test_no_output "maintenance info symtabs"
 
-# GDB has shown only the `func(int)' entry before.
-gdb_test "complete break 'func(" "break 'func\\(int\\)\r\nbreak 'func\\(typedefed\\)"
+# GDB has shown only the `long func<short>()' ELF symbol before, not the DWARF
+# symbol
+gdb_test "complete p 'func<short>(" "p 'func<short>\\(\\)"
index 85f01d9..74019bd 100644 (file)
@@ -180,9 +180,11 @@ gdb_test "print F" "&S::somefunc" "test value of F in k2_m"
 
 gdb_continue_to_breakpoint "continue to sixth breakpoint for temargs"
 
-if $have_older_template_gcc { setup_xfail "*-*-*" }
+if $have_older_template_gcc { setup_xfail "*-*-*"
+} else { setup_kfail gcc/49546 "*-*-*" }
 gdb_test "ptype F" {type = void \(\*\)\(int\)} "test type of F in k3_m"
 
-if $have_older_template_gcc { setup_xfail "*-*-*" }
+if $have_older_template_gcc { setup_xfail "*-*-*"
+} else { setup_kfail gcc/49546 "*-*-*" }
 gdb_test "print F" { = \(void \(\*\)\(int\)\) 0x[0-9a-f]+ <S3::m\(int\)>} \
         "test value of F in k3_m"
diff --git a/gdb/testsuite/gdb.dwarf2/dw2-linkage-name-trust-main.cc b/gdb/testsuite/gdb.dwarf2/dw2-linkage-name-trust-main.cc
new file mode 100644 (file)
index 0000000..61ea1d5
--- /dev/null
@@ -0,0 +1,41 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2011 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/>.  */
+
+/* class C
+   {
+   public:
+     static int f ();
+   };  */
+
+asm (".globl cu_text_start");
+asm ("cu_text_start:");
+
+int
+f (void)
+{
+  return 31173;
+}
+
+int
+main (void)
+{
+  f ();
+  return 0;
+}
+
+asm (".globl cu_text_end");
+asm ("cu_text_end:");
diff --git a/gdb/testsuite/gdb.dwarf2/dw2-linkage-name-trust.S b/gdb/testsuite/gdb.dwarf2/dw2-linkage-name-trust.S
new file mode 100644 (file)
index 0000000..7546302
--- /dev/null
@@ -0,0 +1,134 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2011 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/>.  */
+
+/* Debug information */
+
+       .data
+       .globl  c
+c:     .4byte  0
+
+       .section .debug_info
+.Lcu1_begin:
+       /* CU header */
+       .4byte  .Lcu1_end - .Lcu1_start         /* Length of Compilation Unit */
+.Lcu1_start:
+       .2byte  2                               /* DWARF Version */
+       .4byte  .Labbrev1_begin                 /* Offset into abbrev section */
+       .byte   4                               /* Pointer size */
+
+       /* CU die */
+       .uleb128 1                              /* Abbrev: DW_TAG_compile_unit */
+       .4byte  cu_text_start                   /* DW_AT_low_pc */
+       .4byte  cu_text_end                     /* DW_AT_high_pc */
+       .ascii  "file1.txt\0"                   /* DW_AT_name */
+       .ascii  "GNU C 3.3.3\0"                 /* DW_AT_producer */
+       .byte   4                               /* DW_AT_language (DW_LANG_C_plus_plus) */
+
+.Ltype_class:
+       .uleb128        3                       /* Abbrev: DW_TAG_class_type */
+       .ascii          "C\0"                   /* DW_AT_name */
+
+       .uleb128        5                       /* Abbrev: DW_TAG_subprogram */
+       .byte           1                       /* DW_AT_external */
+       .ascii          "membername\0"          /* DW_AT_name */
+       .ascii          "f\0"                   /* DW_AT_MIPS_linkage_name */
+       .4byte          .Ltype_int-.Lcu1_begin  /* DW_AT_type */
+
+       .byte           0                       /* End of children of DW_TAG_class_type */
+
+       .uleb128        4                       /* Abbrev: DW_TAG_variable */
+       .ascii          "c\0"                   /* DW_AT_name */
+       .4byte          .Ltype_class-.Lcu1_begin /* DW_AT_type */
+       .byte           1                       /* DW_AT_external */
+
+.Ltype_int:
+       .uleb128        2                       /* Abbrev: DW_TAG_base_type */
+       .ascii          "int\0"                 /* DW_AT_name */
+       .byte           4                       /* DW_AT_byte_size */
+       .byte           5                       /* DW_AT_encoding */
+
+       .byte           0                       /* End of children of CU */
+
+.Lcu1_end:
+
+/* Abbrev table */
+       .section .debug_abbrev
+.Labbrev1_begin:
+       .uleb128        1                       /* Abbrev code */
+       .uleb128        0x11                    /* DW_TAG_compile_unit */
+       .byte           1                       /* has_children */
+       .uleb128        0x11                    /* DW_AT_low_pc */
+       .uleb128        0x1                     /* DW_FORM_addr */
+       .uleb128        0x12                    /* DW_AT_high_pc */
+       .uleb128        0x1                     /* DW_FORM_addr */
+       .uleb128        0x3                     /* DW_AT_name */
+       .uleb128        0x8                     /* DW_FORM_string */
+       .uleb128        0x25                    /* DW_AT_producer */
+       .uleb128        0x8                     /* DW_FORM_string */
+       .uleb128        0x13                    /* DW_AT_language */
+       .uleb128        0xb                     /* DW_FORM_data1 */
+       .byte           0x0                     /* Terminator */
+       .byte           0x0                     /* Terminator */
+
+       .uleb128        2                       /* Abbrev code */
+       .uleb128        0x24                    /* DW_TAG_base_type */
+       .byte           0                       /* has_children */
+       .uleb128        0x3                     /* DW_AT_name */
+       .uleb128        0x8                     /* DW_FORM_string */
+       .uleb128        0xb                     /* DW_AT_byte_size */
+       .uleb128        0xb                     /* DW_FORM_data1 */
+       .uleb128        0x3e                    /* DW_AT_encoding */
+       .uleb128        0xb                     /* DW_FORM_data1 */
+       .byte           0x0                     /* Terminator */
+       .byte           0x0                     /* Terminator */
+
+       .uleb128        3                       /* Abbrev code */
+       .uleb128        0x2                     /* DW_TAG_class_type */
+       .byte           1                       /* has_children */
+       .uleb128        0x3                     /* DW_AT_name */
+       .uleb128        0x8                     /* DW_FORM_string */
+       .byte           0x0                     /* Terminator */
+       .byte           0x0                     /* Terminator */
+
+       .uleb128        4                       /* Abbrev code */
+       .uleb128        0x34                    /* DW_TAG_variable */
+       .byte           0                       /* has_children */
+       .uleb128        0x3                     /* DW_AT_name */
+       .uleb128        0x8                     /* DW_FORM_string */
+       .uleb128        0x49                    /* DW_AT_type */
+       .uleb128        0x13                    /* DW_FORM_ref4 */
+       .uleb128        0x3f                    /* DW_AT_external */
+       .uleb128        0xc                     /* DW_FORM_flag */
+       .byte           0x0                     /* Terminator */
+       .byte           0x0                     /* Terminator */
+
+       .uleb128        5                       /* Abbrev code */
+       .uleb128        0x2e                    /* DW_TAG_subprogram */
+       .byte           0                       /* has_children */
+       .uleb128        0x3f                    /* DW_AT_external */
+       .uleb128        0xc                     /* DW_FORM_flag */
+       .uleb128        0x3                     /* DW_AT_name */
+       .uleb128        0x8                     /* DW_FORM_string */
+       .uleb128        0x2007                  /* DW_AT_MIPS_linkage_name */
+       .uleb128        0x8                     /* DW_FORM_string */
+       .uleb128        0x49                    /* DW_AT_type */
+       .uleb128        0x13                    /* DW_FORM_ref4 */
+       .byte           0x0                     /* Terminator */
+       .byte           0x0                     /* Terminator */
+
+       .byte           0x0                     /* Terminator */
+       .byte           0x0                     /* Terminator */
diff --git a/gdb/testsuite/gdb.dwarf2/dw2-linkage-name-trust.exp b/gdb/testsuite/gdb.dwarf2/dw2-linkage-name-trust.exp
new file mode 100644 (file)
index 0000000..fc8bdac
--- /dev/null
@@ -0,0 +1,55 @@
+# Copyright 2011 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/>.
+
+# Check that GDB can call C++ functions whose parameters or return values have
+# type containing a static member of the same type.
+
+# Still no C++ compiler is used.
+if { [skip_cplus_tests] } { continue }
+
+load_lib dwarf.exp
+# This test can only be run on targets which support DWARF-2 and use gas.
+if {![dwarf2_support]} {
+    return 0  
+}
+
+set testfile "dw2-linkage-name-trust"
+set executable ${testfile}
+set binfile ${objdir}/${subdir}/${executable}
+if { [gdb_compile ${srcdir}/${subdir}/${testfile}-main.cc "${objdir}/${subdir}/${testfile}-main.o" object {c++ debug}] != ""
+     || [gdb_compile "${srcdir}/${subdir}/${testfile}.S" "${objdir}/${subdir}/${testfile}.o" object {}] != ""
+     || [gdb_compile "${objdir}/${subdir}/${testfile}-main.o ${objdir}/${subdir}/${testfile}.o" "${binfile}" executable {c++}] != "" } {
+    return -1
+}
+
+clean_restart $executable
+
+if ![runto_main] then {
+    return -1
+}
+
+# main is not provided by DWARF.
+gdb_test_no_output "set language c++"
+
+# There are no mangled names in DWARF to suggest the v3 ABI.
+gdb_test_no_output "set cp-abi gnu-v3"
+
+# GDB cannot resolve external member function for which only ELF (and not
+# DWARF) symbol is available.  Therefore the function `f' must have DWARF which
+# confuses it a bit.
+
+gdb_test "p c.membername" " = {.*} 0x\[0-9a-f\]+ <f\\(\\)>"
+gdb_breakpoint "C::membername"
+gdb_test "p c.membername ()" "\r\nBreakpoint \[0-9\]+, .*"