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crash/crash-4.0-8.11-dwarf3.patch
Lubomir Rintel d745e52e60 - Fix reading of dwarf 3 DW_AT_data_member_location 
- Use proper compiler flags
2009-08-09 12:26:35 +00:00

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commit 4809b16f7e629929a10ab8b15816b4f6f775aa82
Author: Jim Blandy <jimb@codesourcery.com>
Date: Thu Dec 13 19:02:51 2007 +0000
commit 35fb264aa9a28b8d117df1e5a19fa3bfaf5a2cc8
Author: Jim Blandy <jimb@codesourcery.com>
Date: Mon Dec 17 18:38:30 2007 +0000
Cherry-picked and backported these, since gdb would crash reading dwarf 3
DW_AT_data_member_location that gcc generates now.
-- Lubomir Rintel <lkundrak@v3.sk>
diff -urp gdb-6.1.orig/gdb/ChangeLog gdb-6.1/gdb/ChangeLog
--- gdb-6.1.orig/gdb/ChangeLog 2009-08-08 17:04:24.836969960 +0200
+++ gdb-6.1/gdb/ChangeLog 2009-08-08 17:00:21.682970174 +0200
@@ -1,3 +1,14 @@
+2007-12-13 Jim Blandy <jimb@codesourcery.com>
+
+ * dwarf2read.c (attr_form_is_constant): New function.
+ (dwarf2_add_field): Use it and attr_form_is_section_offset to
+ recognize DW_AT_data_member_location attributes. Use
+ dwarf2_get_attr_constant_value when the attribute is a constant.
+
+ * dwarf2read.c (attr_form_is_section_offset): New function.
+ (dwarf_add_member_fn, read_common_block, read_partial_die)
+ (dwarf2_symbol_mark_computed): Use it, instead of writing it out.
+
2004-04-03 GDB Administrator <gdbadmin@sourceware.org>
GDB 6.1 released.
diff -urp gdb-6.1.orig/gdb/dwarf2read.c gdb-6.1/gdb/dwarf2read.c
--- gdb-6.1.orig/gdb/dwarf2read.c 2009-06-30 17:31:20.000000000 +0200
+++ gdb-6.1/gdb/dwarf2read.c 2009-08-08 17:20:00.031969143 +0200
@@ -922,6 +922,10 @@ static void dwarf_decode_macros (struct
static int attr_form_is_block (struct attribute *);
+static int attr_form_is_section_offset (struct attribute *);
+
+static int attr_form_is_constant (struct attribute *);
+
static void
dwarf2_symbol_mark_computed (struct attribute *attr, struct symbol *sym,
struct dwarf2_cu *cu);
@@ -2618,8 +2622,16 @@ dwarf2_add_field (struct field_info *fip
attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
if (attr)
{
- FIELD_BITPOS (*fp) =
- decode_locdesc (DW_BLOCK (attr), cu) * bits_per_byte;
+ if (attr_form_is_section_offset (attr))
+ {
+ dwarf2_complex_location_expr_complaint ();
+ FIELD_BITPOS (*fp) = 0;
+ }
+ else if (attr_form_is_constant (attr))
+ FIELD_BITPOS (*fp) = dwarf2_get_attr_constant_value (attr, 0);
+ else
+ FIELD_BITPOS (*fp) =
+ decode_locdesc (DW_BLOCK (attr), cu) * bits_per_byte;
}
else
FIELD_BITPOS (*fp) = 0;
@@ -2939,7 +2951,7 @@ dwarf2_add_member_fn (struct field_info
{
fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
}
- else if (attr->form == DW_FORM_data4 || attr->form == DW_FORM_data8)
+ else if (attr_form_is_section_offset (attr))
{
dwarf2_complex_location_expr_complaint ();
}
@@ -3482,7 +3494,7 @@ read_common_block (struct die_info *die,
{
base = decode_locdesc (DW_BLOCK (attr), cu);
}
- else if (attr->form == DW_FORM_data4 || attr->form == DW_FORM_data8)
+ else if (attr_form_is_section_offset (attr))
{
dwarf2_complex_location_expr_complaint ();
}
@@ -4392,7 +4404,7 @@ read_partial_die (struct partial_die_inf
{
part_die->locdesc = DW_BLOCK (&attr);
}
- else if (attr.form == DW_FORM_data4 || attr.form == DW_FORM_data8)
+ else if (attr_form_is_section_offset (&attr))
{
dwarf2_complex_location_expr_complaint ();
}
@@ -8030,11 +8042,51 @@ attr_form_is_block (struct attribute *at
|| attr->form == DW_FORM_block);
}
+/* Return non-zero if ATTR's value is a section offset (classes
+ lineptr, loclistptr, macptr or rangelistptr). In this case,
+ you may use DW_UNSND (attr) to retrieve the offset. */
+static int
+attr_form_is_section_offset (struct attribute *attr)
+{
+ return (attr->form == DW_FORM_data4
+ || attr->form == DW_FORM_data8);
+}
+
+
+/* Return non-zero if ATTR's value falls in the 'constant' class, or
+ zero otherwise. When this function returns true, you can apply
+ dwarf2_get_attr_constant_value to it.
+
+ However, note that for some attributes you must check
+ attr_form_is_section_offset before using this test. DW_FORM_data4
+ and DW_FORM_data8 are members of both the constant class, and of
+ the classes that contain offsets into other debug sections
+ (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
+ that, if an attribute's can be either a constant or one of the
+ section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
+ taken as section offsets, not constants. */
+static int
+attr_form_is_constant (struct attribute *attr)
+{
+ switch (attr->form)
+ {
+ case DW_FORM_sdata:
+ case DW_FORM_udata:
+ case DW_FORM_data1:
+ case DW_FORM_data2:
+ case DW_FORM_data4:
+ case DW_FORM_data8:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
static void
dwarf2_symbol_mark_computed (struct attribute *attr, struct symbol *sym,
struct dwarf2_cu *cu)
{
- if (attr->form == DW_FORM_data4 || attr->form == DW_FORM_data8)
+ if (attr_form_is_section_offset (attr))
{
struct dwarf2_loclist_baton *baton;
diff -urp gdb-6.1.orig/gdb/ChangeLog gdb-6.1/gdb/ChangeLog
--- gdb-6.1.orig/gdb/ChangeLog 2009-08-08 20:49:34.000000000 +0200
+++ gdb-6.1/gdb/ChangeLog 2009-08-09 13:04:25.842288308 +0200
@@ -1,3 +1,11 @@
+2007-12-17 Jim Blandy <jimb@codesourcery.com>
+
+ * dwarf2read.c (dwarf2_add_field): Correctly scale all byte
+ offsets obtained from DW_AT_data_member_location before recording
+ them in FIELD_BITPOS (*fp).
+
+ * dwarf2read.c (attr_form_is_section_offset): Doc fixes.
+
2007-12-13 Jim Blandy <jimb@codesourcery.com>
* dwarf2read.c (attr_form_is_constant): New function.
diff -urp gdb-6.1.orig/gdb/dwarf2read.c gdb-6.1/gdb/dwarf2read.c
--- gdb-6.1.orig/gdb/dwarf2read.c 2009-08-08 20:49:34.000000000 +0200
+++ gdb-6.1/gdb/dwarf2read.c 2009-08-09 13:04:25.864291129 +0200
@@ -2622,16 +2622,19 @@ dwarf2_add_field (struct field_info *fip
attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
if (attr)
{
+ int byte_offset;
+
if (attr_form_is_section_offset (attr))
{
dwarf2_complex_location_expr_complaint ();
- FIELD_BITPOS (*fp) = 0;
+ byte_offset = 0;
}
else if (attr_form_is_constant (attr))
- FIELD_BITPOS (*fp) = dwarf2_get_attr_constant_value (attr, 0);
+ byte_offset = dwarf2_get_attr_constant_value (attr, 0);
else
- FIELD_BITPOS (*fp) =
- decode_locdesc (DW_BLOCK (attr), cu) * bits_per_byte;
+ byte_offset = decode_locdesc (DW_BLOCK (attr), cu);
+
+ FIELD_BITPOS (*fp) = byte_offset * bits_per_byte;
}
else
FIELD_BITPOS (*fp) = 0;
@@ -8042,9 +8045,14 @@ attr_form_is_block (struct attribute *at
|| attr->form == DW_FORM_block);
}
-/* Return non-zero if ATTR's value is a section offset (classes
- lineptr, loclistptr, macptr or rangelistptr). In this case,
- you may use DW_UNSND (attr) to retrieve the offset. */
+/* Return non-zero if ATTR's value is a section offset --- classes
+ lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
+ You may use DW_UNSND (attr) to retrieve such offsets.
+
+ Section 7.5.4, "Attribute Encodings", explains that no attribute
+ may have a value that belongs to more than one of these classes; it
+ would be ambiguous if we did, because we use the same forms for all
+ of them. */
static int
attr_form_is_section_offset (struct attribute *attr)
{
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