gdb/gdb-commonblock-pie.patch

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http://sourceware.org/ml/gdb-patches/2013-01/msg00469.html
Subject: [patch] Fix gdb.fortran/common-block.exp crash in PIE mode
Hi Tom,
runtest F90_FOR_TARGET="gfortran -fPIE -pie" gdb.fortran/common-block.exp
crashes GDB as function relocate_one_symbol
if ((SYMBOL_CLASS (sym) == LOC_LABEL
|| SYMBOL_CLASS (sym) == LOC_STATIC)
&& SYMBOL_SECTION (sym) >= 0)
SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (delta, SYMBOL_SECTION (sym));
corrupts SYMBOL_VALUE_COMMON_BLOCK
struct common_block *common_block;
as it thinks it can update it like SYMBOL_VALUE_ADDRESS
CORE_ADDR address;
due to its LOC_STATIC.
No regressions on {x86_64,x86_64-m32,i686}-fedora18-linux-gnu and in PIE mode.
Thanks,
Jan
gdb/
2013-01-19 Jan Kratochvil <jan.kratochvil@redhat.com>
Fix gdb.fortran/common-block.exp crash in PIE mode.
* dwarf2read.c (new_symbol_full) <DW_TAG_common_block>: Use
LOC_COMMON_BLOCK.
* f-valprint.c (info_common_command_for_block): Expect
LOC_COMMON_BLOCK in gdb_assert.
* symtab.h (struct general_symbol_info): Update comment for the
common_block member.
(domain_enum): Extend comment for the COMMON_BLOCK_DOMAIN member.
(enum address_class): New member LOC_COMMON_BLOCK.
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 7a58c45..364e6af 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -16071,7 +16071,7 @@ new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
list_to_add = &global_symbols;
break;
case DW_TAG_common_block:
- SYMBOL_CLASS (sym) = LOC_STATIC;
+ SYMBOL_CLASS (sym) = LOC_COMMON_BLOCK;
SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
add_symbol_to_list (sym, cu->list_in_scope);
break;
diff --git a/gdb/f-valprint.c b/gdb/f-valprint.c
index 22cca83..d01d6ec 100644
--- a/gdb/f-valprint.c
+++ b/gdb/f-valprint.c
@@ -427,7 +427,7 @@ info_common_command_for_block (struct block *block, const char *comname,
struct common_block *common = SYMBOL_VALUE_COMMON_BLOCK (sym);
size_t index;
- gdb_assert (SYMBOL_CLASS (sym) == LOC_STATIC);
+ gdb_assert (SYMBOL_CLASS (sym) == LOC_COMMON_BLOCK);
if (comname && (!SYMBOL_LINKAGE_NAME (sym)
|| strcmp (comname, SYMBOL_LINKAGE_NAME (sym)) != 0))
diff --git a/gdb/symtab.h b/gdb/symtab.h
index c334a3a..b992266 100644
--- a/gdb/symtab.h
+++ b/gdb/symtab.h
@@ -120,7 +120,7 @@ struct general_symbol_info
CORE_ADDR address;
- /* A common block. Used with COMMON_BLOCK_DOMAIN. */
+ /* A common block. Used with LOC_COMMON_BLOCK. */
struct common_block *common_block;
@@ -414,7 +414,8 @@ typedef enum domain_enum_tag
LABEL_DOMAIN,
- /* Fortran common blocks. Their naming must be separate from VAR_DOMAIN. */
+ /* Fortran common blocks. Their naming must be separate from VAR_DOMAIN.
+ They also always use LOC_COMMON_BLOCK. */
COMMON_BLOCK_DOMAIN
} domain_enum;
@@ -533,6 +534,10 @@ enum address_class
/* The variable's address is computed by a set of location
functions (see "struct symbol_computed_ops" below). */
LOC_COMPUTED,
+
+ /* The variable uses general_symbol_info->value->common_block field.
+ It also always uses COMMON_BLOCK_DOMAIN. */
+ LOC_COMMON_BLOCK,
};
/* The methods needed to implement LOC_COMPUTED. These methods can