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* dwarf2expr.c (ctx_no_read_reg): New function.
	* dwarf2expr.h (ctx_no_read_reg): New declaration.
	* dwarf2read.c (read_2_signed_bytes, read_4_signed_bytes): Remove.
	(decode_locdesc_read_mem, decode_locdesc_ctx_funcs): New.
	(decode_locdesc): Replace by a caller of dwarf_expr_eval.

gdb/testsuite/
	* gdb.dwarf2/dw2-simple-locdesc.S: New file.
	* gdb.dwarf2/dw2-simple-locdesc.exp: New file.
	* gdb.dwarf2/dw2-stack-boundary.exp (check partial symtab errors):
	Change the expected string.
This commit is contained in:
Jan Kratochvil 2011-07-27 17:08:06 +00:00
parent 523f3620b8
commit 3c6e0cb359
8 changed files with 334 additions and 233 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
gdb/ChangeLog
View file

@ -1,3 +1,11 @@
2011-07-27 Jan Kratochvil <jan.kratochvil@redhat.com>
* dwarf2expr.c (ctx_no_read_reg): New function.
* dwarf2expr.h (ctx_no_read_reg): New declaration.
* dwarf2read.c (read_2_signed_bytes, read_4_signed_bytes): Remove.
(decode_locdesc_read_mem, decode_locdesc_ctx_funcs): New.
(decode_locdesc): Replace by a caller of dwarf_expr_eval.
2011-07-27 Jan Kratochvil <jan.kratochvil@redhat.com>
* dwarf2-frame.c (no_get_frame_base, no_get_frame_cfa, no_get_frame_pc)

8
gdb/dwarf2expr.c
View file

@ -1280,6 +1280,14 @@ abort_expression:
gdb_assert (ctx->recursion_depth >= 0);
}
/* Stub dwarf_expr_context_funcs.read_reg implementation. */
CORE_ADDR
ctx_no_read_reg (void *baton, int regnum)
{
error (_("Registers access is invalid in this context"));
}
/* Stub dwarf_expr_context_funcs.get_frame_base implementation. */
void

1
gdb/dwarf2expr.h
View file

@ -255,6 +255,7 @@ void dwarf_expr_require_composition (const gdb_byte *, const gdb_byte *,
/* Stub dwarf_expr_context_funcs implementations. */
CORE_ADDR ctx_no_read_reg (void *baton, int regnum);
void ctx_no_get_frame_base (void *baton, const gdb_byte **start,
size_t *length);
CORE_ADDR ctx_no_get_frame_cfa (void *baton);

307
gdb/dwarf2read.c
View file

@ -10059,24 +10059,12 @@ read_2_bytes (bfd *abfd, gdb_byte *buf)
return bfd_get_16 (abfd, buf);
}
static int
read_2_signed_bytes (bfd *abfd, gdb_byte *buf)
{
return bfd_get_signed_16 (abfd, buf);
}
static unsigned int
read_4_bytes (bfd *abfd, gdb_byte *buf)
{
return bfd_get_32 (abfd, buf);
}
static int
read_4_signed_bytes (bfd *abfd, gdb_byte *buf)
{
return bfd_get_signed_32 (abfd, buf);
}
static ULONGEST
read_8_bytes (bfd *abfd, gdb_byte *buf)
{
@ -14151,6 +14139,37 @@ read_signatured_type (struct objfile *objfile,
dwarf2_per_objfile->read_in_chain = &type_sig->per_cu;
}
/* Workaround as dwarf_expr_context_funcs.read_mem implementation before
a proper runtime DWARF expressions evaluator gets implemented.
Otherwise gnuv3_baseclass_offset would error by:
Expected a negative vbase offset (old compiler?) */
static void
decode_locdesc_read_mem (void *baton, gdb_byte *buf, CORE_ADDR addr,
size_t length)
{
struct dwarf_expr_context *ctx = baton;
struct gdbarch *gdbarch = ctx->gdbarch;
struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
memset (buf, 0, length);
if (TYPE_LENGTH (ptr_type) == length)
store_typed_address (buf, ptr_type, addr);
}
static const struct dwarf_expr_context_funcs decode_locdesc_ctx_funcs =
{
ctx_no_read_reg,
decode_locdesc_read_mem,
ctx_no_get_frame_base,
ctx_no_get_frame_cfa,
ctx_no_get_frame_pc,
ctx_no_get_tls_address,
ctx_no_dwarf_call,
ctx_no_get_base_type
};
/* Decode simple location descriptions.
Given a pointer to a dwarf block that defines a location, compute
the location and return the value.
@ -14168,235 +14187,59 @@ read_signatured_type (struct objfile *objfile,
object is optimized out. The return value is 0 for that case.
FIXME drow/2003-11-16: No callers check for this case any more; soon all
callers will only want a very basic result and this can become a
complaint.
Note that stack[0] is unused except as a default error return. */
complaint. */
static CORE_ADDR
decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->objfile;
int i;
int size = blk->size;
gdb_byte *data = blk->data;
CORE_ADDR stack[64];
int stacki;
unsigned int bytes_read, unsnd;
gdb_byte op;
struct dwarf_expr_context *ctx;
struct cleanup *old_chain;
volatile struct gdb_exception ex;
i = 0;
stacki = 0;
stack[stacki] = 0;
stack[++stacki] = 0;
ctx = new_dwarf_expr_context ();
old_chain = make_cleanup_free_dwarf_expr_context (ctx);
make_cleanup_value_free_to_mark (value_mark ());
while (i < size)
ctx->gdbarch = get_objfile_arch (objfile);
ctx->addr_size = cu->header.addr_size;
ctx->offset = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
ctx->baton = ctx;
ctx->funcs = &decode_locdesc_ctx_funcs;
/* DW_AT_data_member_location expects the structure address to be pushed on
the stack. Simulate the offset by address 0. */
dwarf_expr_push_address (ctx, 0, 0);
TRY_CATCH (ex, RETURN_MASK_ERROR)
{
op = data[i++];
switch (op)
{
case DW_OP_lit0:
case DW_OP_lit1:
case DW_OP_lit2:
case DW_OP_lit3:
case DW_OP_lit4:
case DW_OP_lit5:
case DW_OP_lit6:
case DW_OP_lit7:
case DW_OP_lit8:
case DW_OP_lit9:
case DW_OP_lit10:
case DW_OP_lit11:
case DW_OP_lit12:
case DW_OP_lit13:
case DW_OP_lit14:
case DW_OP_lit15:
case DW_OP_lit16:
case DW_OP_lit17:
case DW_OP_lit18:
case DW_OP_lit19:
case DW_OP_lit20:
case DW_OP_lit21:
case DW_OP_lit22:
case DW_OP_lit23:
case DW_OP_lit24:
case DW_OP_lit25:
case DW_OP_lit26:
case DW_OP_lit27:
case DW_OP_lit28:
case DW_OP_lit29:
case DW_OP_lit30:
case DW_OP_lit31:
stack[++stacki] = op - DW_OP_lit0;
break;
case DW_OP_reg0:
case DW_OP_reg1:
case DW_OP_reg2:
case DW_OP_reg3:
case DW_OP_reg4:
case DW_OP_reg5:
case DW_OP_reg6:
case DW_OP_reg7:
case DW_OP_reg8:
case DW_OP_reg9:
case DW_OP_reg10:
case DW_OP_reg11:
case DW_OP_reg12:
case DW_OP_reg13:
case DW_OP_reg14:
case DW_OP_reg15:
case DW_OP_reg16:
case DW_OP_reg17:
case DW_OP_reg18:
case DW_OP_reg19:
case DW_OP_reg20:
case DW_OP_reg21:
case DW_OP_reg22:
case DW_OP_reg23:
case DW_OP_reg24:
case DW_OP_reg25:
case DW_OP_reg26:
case DW_OP_reg27:
case DW_OP_reg28:
case DW_OP_reg29:
case DW_OP_reg30:
case DW_OP_reg31:
stack[++stacki] = op - DW_OP_reg0;
if (i < size)
dwarf2_complex_location_expr_complaint ();
break;
case DW_OP_regx:
unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
i += bytes_read;
stack[++stacki] = unsnd;
if (i < size)
dwarf2_complex_location_expr_complaint ();
break;
case DW_OP_addr:
stack[++stacki] = read_address (objfile->obfd, &data[i],
cu, &bytes_read);
i += bytes_read;
break;
case DW_OP_const1u:
stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
i += 1;
break;
case DW_OP_const1s:
stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
i += 1;
break;
case DW_OP_const2u:
stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
i += 2;
break;
case DW_OP_const2s:
stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
i += 2;
break;
case DW_OP_const4u:
stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
i += 4;
break;
case DW_OP_const4s:
stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
i += 4;
break;
case DW_OP_constu:
stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
&bytes_read);
i += bytes_read;
break;
case DW_OP_consts:
stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
i += bytes_read;
break;
case DW_OP_dup:
stack[stacki + 1] = stack[stacki];
stacki++;
break;
case DW_OP_plus:
stack[stacki - 1] += stack[stacki];
stacki--;
break;
case DW_OP_plus_uconst:
stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
&bytes_read);
i += bytes_read;
break;
case DW_OP_minus:
stack[stacki - 1] -= stack[stacki];
stacki--;
break;
case DW_OP_deref:
/* If we're not the last op, then we definitely can't encode
this using GDB's address_class enum. This is valid for partial
global symbols, although the variable's address will be bogus
in the psymtab. */
if (i < size)
dwarf2_complex_location_expr_complaint ();
break;
case DW_OP_GNU_push_tls_address:
/* The top of the stack has the offset from the beginning
of the thread control block at which the variable is located. */
/* Nothing should follow this operator, so the top of stack would
be returned. */
/* This is valid for partial global symbols, but the variable's
address will be bogus in the psymtab. */
if (i < size)
dwarf2_complex_location_expr_complaint ();
break;
case DW_OP_GNU_uninit:
break;
default:
{
const char *name = dwarf_stack_op_name (op);
if (name)
complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
name);
else
complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
op);
}
return (stack[stacki]);
}
/* Enforce maximum stack depth of SIZE-1 to avoid writing
outside of the allocated space. Also enforce minimum>0. */
if (stacki >= ARRAY_SIZE (stack) - 1)
{
complaint (&symfile_complaints,
_("location description stack overflow"));
return 0;
}
if (stacki <= 0)
{
complaint (&symfile_complaints,
_("location description stack underflow"));
return 0;
}
dwarf_expr_eval (ctx, blk->data, blk->size);
}
return (stack[stacki]);
if (ex.reason < 0)
{
if (ex.message)
complaint (&symfile_complaints, "%s", ex.message);
}
else if (ctx->num_pieces == 0)
switch (ctx->location)
{
/* The returned number will be bogus, just do not complain for locations
in global registers - it is here only a partial symbol address. */
case DWARF_VALUE_REGISTER:
case DWARF_VALUE_MEMORY:
case DWARF_VALUE_STACK:
{
CORE_ADDR address = dwarf_expr_fetch_address (ctx, 0);
do_cleanups (old_chain);
return address;
}
}
do_cleanups (old_chain);
dwarf2_complex_location_expr_complaint ();
return 0;
}
/* memory allocation interface */

7
gdb/testsuite/ChangeLog
View file

@ -1,3 +1,10 @@
2011-07-27 Jan Kratochvil <jan.kratochvil@redhat.com>
* gdb.dwarf2/dw2-simple-locdesc.S: New file.
* gdb.dwarf2/dw2-simple-locdesc.exp: New file.
* gdb.dwarf2/dw2-stack-boundary.exp (check partial symtab errors):
Change the expected string.
2011-07-26 Pedro Alves <pedro@codesourcery.com>
* gdb.base/watchpoint.exp

201
gdb/testsuite/gdb.dwarf2/dw2-simple-locdesc.S Normal file
View file

@ -0,0 +1,201 @@
/* 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/>. */
/* This source file was generated by:
echo 'struct s { char a[1<<24]; int b; } s;' \
| gcc -dA -o dw2-simple-locdesc.S -S -gdwarf-2 -x c -
*/
.text
var:
.section .debug_info
.Ldebug_info0:
d:
.4byte .Lcu_end - 1f /* Length of Compilation Unit Info */
1:
.value 0x2 /* DWARF version number */
.4byte .Ldebug_abbrev0 /* Offset Into Abbrev. Section */
.byte 0x4 /* Pointer Size (in bytes) */
.uleb128 0x1 /* (DIE (0xb) DW_TAG_compile_unit) */
.4byte .LASF2 /* DW_AT_producer: "GNU C 4.7.0 20110727 (experimental)" */
.byte 0x1 /* DW_AT_language */
.Ldie19:
.uleb128 0x2 /* (DIE (0x19) DW_TAG_structure_type) */
.ascii "s\0" /* DW_AT_name */
.4byte 0x1000004 /* DW_AT_byte_size */
.byte 0x1 /* DW_AT_decl_file (<stdin>) */
.byte 0x1 /* DW_AT_decl_line */
.Ldie26:
.uleb128 0x3 /* (DIE (0x26) DW_TAG_member) */
.ascii "a\0" /* DW_AT_name */
.byte 0x1 /* DW_AT_decl_file (<stdin>) */
.byte 0x1 /* DW_AT_decl_line */
.4byte .Ldie41 - d /* DW_AT_type */
.byte 0x2 /* DW_AT_data_member_location */
.byte 0x23 /* DW_OP_plus_uconst */
.uleb128 0
.Ldie32:
.uleb128 0x3 /* (DIE (0x32) DW_TAG_member) */
.ascii "b\0" /* DW_AT_name */
.byte 0x1 /* DW_AT_decl_file (<stdin>) */
.byte 0x1 /* DW_AT_decl_line */
.4byte .Ldie62 - d /* DW_AT_type */
.byte 0x4 /* DW_AT_data_member_location */
.byte 0x40 /* DW_OP_lit16 */
.byte 0x44 /* DW_OP_lit20 */
.byte 0x24 /* DW_OP_shl */
.byte 0x22 /* DW_OP_plus */
.byte 0 /* end of children of DIE 0x19 */
.Ldie41:
.uleb128 0x4 /* (DIE (0x41) DW_TAG_array_type) */
.4byte .Ldie5b - d /* DW_AT_type */
.Ldie4a:
.uleb128 0x5 /* (DIE (0x4a) DW_TAG_subrange_type) */
.4byte .Ldie54 - d /* DW_AT_type */
.4byte 0xffffff /* DW_AT_upper_bound */
.byte 0 /* end of children of DIE 0x41 */
.Ldie54:
.uleb128 0x6 /* (DIE (0x54) DW_TAG_base_type) */
.byte 0x8 /* DW_AT_byte_size */
.byte 0x7 /* DW_AT_encoding */
.4byte .LASF0 /* DW_AT_name: "sizetype" */
.Ldie5b:
.uleb128 0x6 /* (DIE (0x5b) DW_TAG_base_type) */
.byte 0x1 /* DW_AT_byte_size */
.byte 0x6 /* DW_AT_encoding */
.4byte .LASF1 /* DW_AT_name: "char" */
.Ldie62:
.uleb128 0x7 /* (DIE (0x62) DW_TAG_base_type) */
.byte 0x4 /* DW_AT_byte_size */
.byte 0x5 /* DW_AT_encoding */
.ascii "int\0" /* DW_AT_name */
.Ldie69:
.uleb128 0x8 /* (DIE (0x69) DW_TAG_variable) */
.ascii "s\0" /* DW_AT_name */
.byte 0x1 /* DW_AT_decl_file (<stdin>) */
.byte 0x1 /* DW_AT_decl_line */
.4byte .Ldie19 - d /* DW_AT_type */
.byte 0x1 /* DW_AT_external */
.byte 2f - 1f /* DW_AT_location */
1:
.byte 0x3 /* DW_OP_addr */
.4byte var
2:
.byte 0 /* end of children of DIE 0xb */
.Lcu_end:
.section .debug_abbrev
.Ldebug_abbrev0:
.uleb128 0x1 /* (abbrev code) */
.uleb128 0x11 /* (TAG: DW_TAG_compile_unit) */
.byte 0x1 /* DW_children_yes */
.uleb128 0x25 /* (DW_AT_producer) */
.uleb128 0xe /* (DW_FORM_strp) */
.uleb128 0x13 /* (DW_AT_language) */
.uleb128 0xb /* (DW_FORM_data1) */
.byte 0
.byte 0
.uleb128 0x2 /* (abbrev code) */
.uleb128 0x13 /* (TAG: DW_TAG_structure_type) */
.byte 0x1 /* DW_children_yes */
.uleb128 0x3 /* (DW_AT_name) */
.uleb128 0x8 /* (DW_FORM_string) */
.uleb128 0xb /* (DW_AT_byte_size) */
.uleb128 0x6 /* (DW_FORM_data4) */
.uleb128 0x3a /* (DW_AT_decl_file) */
.uleb128 0xb /* (DW_FORM_data1) */
.uleb128 0x3b /* (DW_AT_decl_line) */
.uleb128 0xb /* (DW_FORM_data1) */
.byte 0
.byte 0
.uleb128 0x3 /* (abbrev code) */
.uleb128 0xd /* (TAG: DW_TAG_member) */
.byte 0 /* DW_children_no */
.uleb128 0x3 /* (DW_AT_name) */
.uleb128 0x8 /* (DW_FORM_string) */
.uleb128 0x3a /* (DW_AT_decl_file) */
.uleb128 0xb /* (DW_FORM_data1) */
.uleb128 0x3b /* (DW_AT_decl_line) */
.uleb128 0xb /* (DW_FORM_data1) */
.uleb128 0x49 /* (DW_AT_type) */
.uleb128 0x13 /* (DW_FORM_ref4) */
.uleb128 0x38 /* (DW_AT_data_member_location) */
.uleb128 0xa /* (DW_FORM_block1) */
.byte 0
.byte 0
.uleb128 0x4 /* (abbrev code) */
.uleb128 0x1 /* (TAG: DW_TAG_array_type) */
.byte 0x1 /* DW_children_yes */
.uleb128 0x49 /* (DW_AT_type) */
.uleb128 0x13 /* (DW_FORM_ref4) */
.byte 0
.byte 0
.uleb128 0x5 /* (abbrev code) */
.uleb128 0x21 /* (TAG: DW_TAG_subrange_type) */
.byte 0 /* DW_children_no */
.uleb128 0x49 /* (DW_AT_type) */
.uleb128 0x13 /* (DW_FORM_ref4) */
.uleb128 0x2f /* (DW_AT_upper_bound) */
.uleb128 0x6 /* (DW_FORM_data4) */
.byte 0
.byte 0
.uleb128 0x6 /* (abbrev code) */
.uleb128 0x24 /* (TAG: DW_TAG_base_type) */
.byte 0 /* DW_children_no */
.uleb128 0xb /* (DW_AT_byte_size) */
.uleb128 0xb /* (DW_FORM_data1) */
.uleb128 0x3e /* (DW_AT_encoding) */
.uleb128 0xb /* (DW_FORM_data1) */
.uleb128 0x3 /* (DW_AT_name) */
.uleb128 0xe /* (DW_FORM_strp) */
.byte 0
.byte 0
.uleb128 0x7 /* (abbrev code) */
.uleb128 0x24 /* (TAG: DW_TAG_base_type) */
.byte 0 /* DW_children_no */
.uleb128 0xb /* (DW_AT_byte_size) */
.uleb128 0xb /* (DW_FORM_data1) */
.uleb128 0x3e /* (DW_AT_encoding) */
.uleb128 0xb /* (DW_FORM_data1) */
.uleb128 0x3 /* (DW_AT_name) */
.uleb128 0x8 /* (DW_FORM_string) */
.byte 0
.byte 0
.uleb128 0x8 /* (abbrev code) */
.uleb128 0x34 /* (TAG: DW_TAG_variable) */
.byte 0 /* DW_children_no */
.uleb128 0x3 /* (DW_AT_name) */
.uleb128 0x8 /* (DW_FORM_string) */
.uleb128 0x3a /* (DW_AT_decl_file) */
.uleb128 0xb /* (DW_FORM_data1) */
.uleb128 0x3b /* (DW_AT_decl_line) */
.uleb128 0xb /* (DW_FORM_data1) */
.uleb128 0x49 /* (DW_AT_type) */
.uleb128 0x13 /* (DW_FORM_ref4) */
.uleb128 0x3f /* (DW_AT_external) */
.uleb128 0xc /* (DW_FORM_flag) */
.uleb128 0x2 /* (DW_AT_location) */
.uleb128 0xa /* (DW_FORM_block1) */
.byte 0
.byte 0
.byte 0
.section .debug_str
.LASF2:
.string "GNU C 4.7.0 20110727 (experimental)"
.LASF0:
.string "sizetype"
.LASF1:
.string "char"

33
gdb/testsuite/gdb.dwarf2/dw2-simple-locdesc.exp Normal file
View file

@ -0,0 +1,33 @@
# 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/>.
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-simple-locdesc"
set srcfile ${testfile}.S
set executable ${testfile}.x
set binfile ${objdir}/${subdir}/${executable}
if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" object {}] != "" } {
return -1
}
clean_restart $executable
gdb_test "p &s.b" { = \(int \*\) 0x1000000}

2
gdb/testsuite/gdb.dwarf2/dw2-stack-boundary.exp
View file

@ -41,7 +41,7 @@ if [is_remote host] {
}
}
gdb_test_no_output "set complaints 100"
gdb_test "file $binfile" {Reading symbols from .*\.\.\.location description stack underflow\.\.\.location description stack overflow\.\.\.done\.} "check partial symtab errors"
gdb_test "file $binfile" {Reading symbols from .*\.\.\.Asked for position 0 of stack, stack only has 0 elements on it\..*\.\.\.done\.} "check partial symtab errors"
gdb_test "p underflow" {Asked for position 0 of stack, stack only has 0 elements on it\.}
gdb_test "p overflow" " = 2"