* symfile.c (place_section): Check SEC_ALLOC. Do not check VMA.

	(default_symfile_offsets): Check VMA here.  Update section VMAs.

	* gdb.cp/cp-relocate.cc, gdb.cp/cp-relocate.exp: New.

5 files changed, 235 insertions, 12 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 7c0eb55..9a208d8 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,10 @@
 2007-02-26  Daniel Jacobowitz  <dan@codesourcery.com>
 
+	* symfile.c (place_section): Check SEC_ALLOC.  Do not check VMA.
+	(default_symfile_offsets): Check VMA here.  Update section VMAs.
+
+2007-02-26  Daniel Jacobowitz  <dan@codesourcery.com>
+
 	* remote.c (init_remote_state): Add special handling for placeholder
 	registers.
 
diff --git a/gdb/symfile.c b/gdb/symfile.c
index d8ca7ca..4523b4b 100644
--- a/gdb/symfile.c
+++ b/gdb/symfile.c
@@ -477,8 +477,8 @@ place_section (bfd *abfd, asection *sect, void *obj)
   int done;
   ULONGEST align = ((ULONGEST) 1) << bfd_get_section_alignment (abfd, sect);
 
-  /* We are only interested in loadable sections.  */
-  if ((bfd_get_section_flags (abfd, sect) & SEC_LOAD) == 0)
+  /* We are only interested in allocated sections.  */
+  if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
     return;
 
   /* If the user specified an offset, honor it.  */
@@ -502,13 +502,8 @@ place_section (bfd *abfd, asection *sect, void *obj)
 	if (cur_sec == sect)
 	  continue;
 
-	/* We can only conflict with loadable sections.  */
-	if ((bfd_get_section_flags (abfd, cur_sec) & SEC_LOAD) == 0)
-	  continue;
-
-	/* We do not expect this to happen; just ignore sections in a
-	   relocatable file with an assigned VMA.  */
-	if (bfd_section_vma (abfd, cur_sec) != 0)
+	/* We can only conflict with allocated sections.  */
+	if ((bfd_get_section_flags (abfd, cur_sec) & SEC_ALLOC) == 0)
 	  continue;
 
 	/* If the section offset is 0, either the section has not been placed
@@ -581,9 +576,62 @@ default_symfile_offsets (struct objfile *objfile,
   if ((bfd_get_file_flags (objfile->obfd) & (EXEC_P | DYNAMIC)) == 0)
     {
       struct place_section_arg arg;
-      arg.offsets = objfile->section_offsets;
-      arg.lowest = 0;
-      bfd_map_over_sections (objfile->obfd, place_section, &arg);
+      bfd *abfd = objfile->obfd;
+      asection *cur_sec;
+      CORE_ADDR lowest = 0;
+
+      for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next)
+	/* We do not expect this to happen; just skip this step if the
+	   relocatable file has a section with an assigned VMA.  */
+	if (bfd_section_vma (abfd, cur_sec) != 0)
+	  break;
+
+      if (cur_sec == NULL)
+	{
+	  CORE_ADDR *offsets = objfile->section_offsets->offsets;
+
+	  /* Pick non-overlapping offsets for sections the user did not
+	     place explicitly.  */
+	  arg.offsets = objfile->section_offsets;
+	  arg.lowest = 0;
+	  bfd_map_over_sections (objfile->obfd, place_section, &arg);
+
+	  /* Correctly filling in the section offsets is not quite
+	     enough.  Relocatable files have two properties that
+	     (most) shared objects do not:
+
+	     - Their debug information will contain relocations.  Some
+	     shared libraries do also, but many do not, so this can not
+	     be assumed.
+
+	     - If there are multiple code sections they will be loaded
+	     at different relative addresses in memory than they are
+	     in the objfile, since all sections in the file will start
+	     at address zero.
+
+	     Because GDB has very limited ability to map from an
+	     address in debug info to the correct code section,
+	     it relies on adding SECT_OFF_TEXT to things which might be
+	     code.  If we clear all the section offsets, and set the
+	     section VMAs instead, then symfile_relocate_debug_section
+	     will return meaningful debug information pointing at the
+	     correct sections.
+
+	     GDB has too many different data structures for section
+	     addresses - a bfd, objfile, and so_list all have section
+	     tables, as does exec_ops.  Some of these could probably
+	     be eliminated.  */
+
+	  for (cur_sec = abfd->sections; cur_sec != NULL;
+	       cur_sec = cur_sec->next)
+	    {
+	      if ((bfd_get_section_flags (abfd, cur_sec) & SEC_ALLOC) == 0)
+		continue;
+
+	      bfd_set_section_vma (abfd, cur_sec, offsets[cur_sec->index]);
+	      offsets[cur_sec->index] = 0;
+	    }
+	}
     }
 
   /* Remember the bfd indexes for the .text, .data, .bss and
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 656d0c8..8049665 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,5 +1,9 @@
 2007-02-26  Daniel Jacobowitz  <dan@codesourcery.com>
 
+	* gdb.cp/cp-relocate.cc, gdb.cp/cp-relocate.exp: New.
+
+2007-02-26  Daniel Jacobowitz  <dan@codesourcery.com>
+
 	* gdb.arch/iwmmxt-regs.c, gdb.arch/iwmmxt-regs.exp: Update
 	register capitalization.
 
diff --git a/gdb/testsuite/gdb.cp/cp-relocate.cc b/gdb/testsuite/gdb.cp/cp-relocate.cc
new file mode 100644
index 0000000..e129d73
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/cp-relocate.cc
@@ -0,0 +1,29 @@
+/* This test file is part of GDB, the GNU debugger.
+
+   Copyright 2007
+   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 2 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, USA.  */
+
+template<int X> int func(int)
+{
+  return X;
+}
+
+int caller()
+{
+  return func<1>(1) + func<2>(2);
+}
diff --git a/gdb/testsuite/gdb.cp/cp-relocate.exp b/gdb/testsuite/gdb.cp/cp-relocate.exp
new file mode 100644
index 0000000..1fd1c0f
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/cp-relocate.exp
@@ -0,0 +1,137 @@
+# Copyright 2007 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 2 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, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+# Test loading symbols from unrelocated C++ object files.
+
+set testfile cp-relocate
+set srcfile ${testfile}.cc
+set binfile ${objdir}/${subdir}/${testfile}.o
+
+if { [skip_cplus_tests] } { continue }
+
+if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" object {c++ debug}] != "" } {
+     untested cp-relocate.exp
+     return -1
+}
+
+proc get_func_address { func } {
+    global gdb_prompt hex
+
+    set rfunc [string_to_regexp $func]
+    gdb_test_multiple "print '${func}'" "get address of ${func}" {
+	-re "\\\$\[0-9\]+ = \\{.*\\} (0|($hex) <${rfunc}>)\[\r\n\]+${gdb_prompt} $" {
+	    # $1 = {int ()} 0x24 <function_bar>
+	    # But if the function is at zero, the name may be omitted.
+	    pass "get address of ${func}"
+	    if { $expect_out(1,string) == "0" } {
+		return "0x0"
+	    } else {
+		return $expect_out(2,string)
+	    }
+	}
+    }
+  return ""
+}
+
+# Load the file as an executable; GDB should assign non-overlapping
+# section offsets.
+gdb_exit
+gdb_start
+gdb_reinitialize_dir $srcdir/$subdir
+gdb_file_cmd ${binfile}
+
+# Find the interesting functions.  We go to a little effort to find
+# the right function names here, to work around PR c++/40.
+set func1_name ""
+set func2_name ""
+gdb_test_multiple "info functions func<.>" "info functions" {
+    -re "\r\nint (\[^\r\]*func<1>\[^\r]*);" {
+	set func1_name $expect_out(1,string)
+	exp_continue
+    }
+    -re "\r\nint (\[^\r\]*func<2>\[^\r]*);" {
+	set func2_name $expect_out(1,string)
+	exp_continue
+    }
+    -re "$gdb_prompt $" {
+	if { ${func1_name} != "" && ${func2_name} != "" } {
+	    pass "info functions"
+	} else {
+	    fail "info functions"
+	    return -1
+	}
+    }
+}
+
+# Check that all the functions have different addresses.
+set func1_addr [get_func_address "$func1_name"]
+set func2_addr [get_func_address "$func2_name"]
+set caller_addr [get_func_address "caller"]
+
+if { "${func1_addr}" == "${func2_addr}"
+     || "${func1_addr}" == "${func2_addr}"
+     || "${func2_addr}" == "${caller_addr}" } {
+  fail "C++ functions have different addresses"
+} else {
+  pass "C++ functions have different addresses"
+}
+
+# Figure out the names of the sections containing the template
+# functions.
+set func1_sec ""
+set func2_sec ""
+gdb_test_multiple "info file" "info file" {
+    -re "($hex) - ($hex) is (\[^\r\]*)\r" {
+	if { $expect_out(1,string) <= $func1_addr
+	     && $expect_out(2,string) > $func1_addr } {
+	    set func1_sec $expect_out(3,string)
+	} elseif { $expect_out(1,string) <= $func2_addr
+	    && $expect_out(2,string) > $func2_addr } {
+	    set func2_sec $expect_out(3,string)
+	}
+	exp_continue
+    }
+    -re "$gdb_prompt $" {
+	if { ${func1_sec} != "" && ${func2_sec} != "" } {
+	    pass "info file"
+	} else {
+	    fail "info file"
+	    return -1
+	}
+    }
+}
+
+if { $func1_sec == $func2_sec } {
+    untested "cp-relocate.exp - template functions in same sections"
+    return -1
+}
+
+# Now start a clean GDB, for add-symbol-file tests.
+gdb_exit
+gdb_start
+gdb_reinitialize_dir $srcdir/$subdir
+
+gdb_test "add-symbol-file ${binfile} 0 -s ${func1_sec} 0x40000 -s ${func2_sec} 0x80000" \
+	"Reading symbols from .*${testfile}\\.o\\.\\.\\.done\\.(|\r\nUsing host libthread_db library .*libthread_db.so.*\\.)" \
+	"add-symbol-file ${binfile}" \
+	"add symbol table from file \".*${testfile}\\.o\" at.*\\(y or n\\) " \
+	"y"
+
+# Make sure the function addresses were updated.
+gdb_test "break *'$func1_name'" \
+    "Breakpoint $decimal at 0x4....: file .*"
+gdb_test "break *'$func2_name'" \
+    "Breakpoint $decimal at 0x8....: file .*"