e8d054800a
According to the DWARF3 standard, a function always has a name attribute
(Section 3.3 - Subroutine and Entry Point Entries). The only exception
is when a DW_AT_abstract_origin attribute is provided, in which case
the name may be inherited from the referenced DIE.
The problem occured because our compiler generated a subprogram DIE
for a nested function where the name attribute was missing (and no
abstract-origin either). Our code in add_partial_symbol is not
prepared to deal with the situation, and happily just tries to compute
the length of the (NULL) function name.
This normally cannot happen, because there is already a guard in
scan_partial_symbols, where we (silently!) ignore anonymous dies,
including anonymous subprograms. Unfortunately, there is a flaw that
affects Ada and other languages that allow nested subprograms. For
nested subprograms, we do not go through scan_partial_symbols and
thus we are missing the name check.
This patch adds the name check in the nested subprogram case. It also
adds a complaint which is emitted during the psymtab->symtab conversion
phase.
gdb/ChangeLog:
* dwarf2read.c (add_partial_subprogram): Make sure the subprogram
DIE has a name before creating the associated partial symbol.
(read_func_scope): Emit a complaint if the subprogram does not
have a name or when we can't extract the subprogram PC bounds.
gdb/testsuite/ChangeLog:
* gdb.dwarf2/dw2-anonymous-func.S: New file.
* gdb.dwarf2/dw2-anonymous-func.exp: New testcase.
Tested on x86_64-linux, no regression. Note that the testcase also
verifies that the psymtab->symtab conversion does not crash (this is
the purpose of the "list file1.txt:1" test.
248 lines
7 KiB
ArmAsm
248 lines
7 KiB
ArmAsm
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2004, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Test a minimal file containing DWARF-2 information. This test also
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serves as a skeleton for other DWARF-2 tests. Most other tests will
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not be this extensively itemized and commented... */
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/* Dummy function to provide debug information for. */
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.text
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.Lbegin_text1:
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.globl func_cu1
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.type func_cu1, %function
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func_cu1:
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.Lbegin_func_cu1:
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.int 0
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.Lend_func_cu1:
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.size func_cu1, .-func_cu1
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.globl func_cu2
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.type func_cu2, %function
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func_cu2:
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.Lbegin_func_cu2:
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.int 0
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.Lend_func_cu2:
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.size func_cu2, .-func_cu2
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.Lend_text1:
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/* Debug information */
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.section .debug_info
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.Lcu1_begin:
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/* CU header */
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.4byte .Lcu1_end - .Lcu1_start /* Length of Compilation Unit */
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.Lcu1_start:
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.2byte 2 /* DWARF Version */
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.4byte .Labbrev1_begin /* Offset into abbrev section */
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.byte 4 /* Pointer size */
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/* CU die */
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.uleb128 1 /* Abbrev: DW_TAG_compile_unit */
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.4byte .Lline1_begin /* DW_AT_stmt_list */
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.4byte .Lend_text1 /* DW_AT_high_pc */
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.4byte .Lbegin_text1 /* DW_AT_low_pc */
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.ascii "file1.txt\0" /* DW_AT_name */
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.ascii "GNU C 3.3.3\0" /* DW_AT_producer */
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.byte 0x0d /* DW_AT_language (Ada95) */
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/* func_cu1 */
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.uleb128 2 /* Abbrev: DW_TAG_subprogram */
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.byte 1 /* DW_AT_external */
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.byte 1 /* DW_AT_decl_file */
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.byte 2 /* DW_AT_decl_line */
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.ascii "func_cu1\0" /* DW_AT_name */
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.4byte .Ltype_int-.Lcu1_begin /* DW_AT_type */
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.4byte .Lbegin_func_cu1 /* DW_AT_low_pc */
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.4byte .Lend_func_cu1 /* DW_AT_high_pc */
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.byte 1 /* DW_AT_frame_base: length */
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.byte 0x55 /* DW_AT_frame_base: DW_OP_reg5 */
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/* Nested function missing a name attribute. */
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.uleb128 4 /* Abbrev: DW_TAG_subprogram */
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.byte 1 /* DW_AT_external */
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.byte 1 /* DW_AT_decl_file */
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.byte 2 /* DW_AT_decl_line */
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.4byte .Ltype_int-.Lcu1_begin /* DW_AT_type */
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.4byte .Lbegin_func_cu2 /* DW_AT_low_pc */
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.4byte .Lend_func_cu2 /* DW_AT_high_pc */
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.byte 1 /* DW_AT_frame_base: length */
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.byte 0x55 /* DW_AT_frame_base: DW_OP_reg5 */
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.byte 0x0 /* End of children of func_cu1 */
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/* Non-nested function missing a name attribute. */
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.uleb128 4 /* Abbrev: DW_TAG_subprogram */
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.byte 1 /* DW_AT_external */
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.byte 1 /* DW_AT_decl_file */
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.byte 2 /* DW_AT_decl_line */
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.4byte .Ltype_int-.Lcu1_begin /* DW_AT_type */
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.4byte .Lbegin_func_cu2 /* DW_AT_low_pc */
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.4byte .Lend_func_cu2 /* DW_AT_high_pc */
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.byte 1 /* DW_AT_frame_base: length */
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.byte 0x55 /* DW_AT_frame_base: DW_OP_reg5 */
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.Ltype_int:
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.uleb128 3 /* Abbrev: DW_TAG_base_type */
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.ascii "int\0" /* DW_AT_name */
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.byte 4 /* DW_AT_byte_size */
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.byte 5 /* DW_AT_encoding */
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.byte 0 /* End of children of CU */
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.Lcu1_end:
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/* Abbrev table */
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.section .debug_abbrev
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.Labbrev1_begin:
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.uleb128 1 /* Abbrev code */
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.uleb128 0x11 /* DW_TAG_compile_unit */
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.byte 1 /* has_children */
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.uleb128 0x10 /* DW_AT_stmt_list */
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.uleb128 0x6 /* DW_FORM_data4 */
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.uleb128 0x12 /* DW_AT_high_pc */
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.uleb128 0x1 /* DW_FORM_addr */
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.uleb128 0x11 /* DW_AT_low_pc */
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.uleb128 0x1 /* DW_FORM_addr */
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.uleb128 0x3 /* DW_AT_name */
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.uleb128 0x8 /* DW_FORM_string */
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.uleb128 0x25 /* DW_AT_producer */
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.uleb128 0x8 /* DW_FORM_string */
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.uleb128 0x13 /* DW_AT_language */
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.uleb128 0xb /* DW_FORM_data1 */
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.byte 0x0 /* Terminator */
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.byte 0x0 /* Terminator */
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.uleb128 2 /* Abbrev code */
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.uleb128 0x2e /* DW_TAG_subprogram */
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.byte 1 /* has_children */
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.uleb128 0x3f /* DW_AT_external */
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.uleb128 0xc /* DW_FORM_flag */
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.uleb128 0x3a /* DW_AT_decl_file */
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.uleb128 0xb /* DW_FORM_data1 */
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.uleb128 0x3b /* DW_AT_decl_line */
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.uleb128 0xb /* DW_FORM_data1 */
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.uleb128 0x3 /* DW_AT_name */
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.uleb128 0x8 /* DW_FORM_string */
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.uleb128 0x49 /* DW_AT_type */
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.uleb128 0x13 /* DW_FORM_ref4 */
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.uleb128 0x11 /* DW_AT_low_pc */
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.uleb128 0x1 /* DW_FORM_addr */
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.uleb128 0x12 /* DW_AT_high_pc */
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.uleb128 0x1 /* DW_FORM_addr */
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.uleb128 0x40 /* DW_AT_frame_base */
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.uleb128 0xa /* DW_FORM_block1 */
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.byte 0x0 /* Terminator */
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.byte 0x0 /* Terminator */
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.uleb128 3 /* Abbrev code */
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.uleb128 0x24 /* DW_TAG_base_type */
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.byte 0 /* has_children */
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.uleb128 0x3 /* DW_AT_name */
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.uleb128 0x8 /* DW_FORM_string */
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.uleb128 0xb /* DW_AT_byte_size */
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.uleb128 0xb /* DW_FORM_data1 */
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.uleb128 0x3e /* DW_AT_encoding */
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.uleb128 0xb /* DW_FORM_data1 */
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.byte 0x0 /* Terminator */
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.byte 0x0 /* Terminator */
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.uleb128 4 /* Abbrev code */
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.uleb128 0x2e /* DW_TAG_subprogram */
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.byte 0 /* has_children */
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.uleb128 0x3f /* DW_AT_external */
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.uleb128 0xc /* DW_FORM_flag */
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.uleb128 0x3a /* DW_AT_decl_file */
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.uleb128 0xb /* DW_FORM_data1 */
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.uleb128 0x3b /* DW_AT_decl_line */
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.uleb128 0xb /* DW_FORM_data1 */
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.uleb128 0x49 /* DW_AT_type */
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.uleb128 0x13 /* DW_FORM_ref4 */
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.uleb128 0x11 /* DW_AT_low_pc */
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.uleb128 0x1 /* DW_FORM_addr */
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.uleb128 0x12 /* DW_AT_high_pc */
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.uleb128 0x1 /* DW_FORM_addr */
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.uleb128 0x40 /* DW_AT_frame_base */
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.uleb128 0xa /* DW_FORM_block1 */
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.byte 0x0 /* Terminator */
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.byte 0x0 /* Terminator */
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.byte 0x0 /* Terminator */
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.byte 0x0 /* Terminator */
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/* Line table */
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.section .debug_line
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.Lline1_begin:
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.4byte .Lline1_end - .Lline1_start /* Initial length */
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.Lline1_start:
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.2byte 2 /* Version */
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.4byte .Lline1_lines - .Lline1_hdr /* header_length */
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.Lline1_hdr:
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.byte 1 /* Minimum insn length */
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.byte 1 /* default_is_stmt */
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.byte 1 /* line_base */
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.byte 1 /* line_range */
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.byte 0x10 /* opcode_base */
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/* Standard lengths */
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.byte 0
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.byte 1
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.byte 1
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.byte 1
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.byte 1
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.byte 0
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.byte 0
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.byte 0
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.byte 1
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.byte 0
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.byte 0
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.byte 1
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.byte 0
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.byte 0
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.byte 0
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/* Include directories */
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.byte 0
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/* File names */
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.ascii "file1.txt\0"
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.uleb128 0
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.uleb128 0
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.uleb128 0
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.byte 0
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.Lline1_lines:
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.byte 0 /* DW_LNE_set_address */
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.uleb128 5
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.byte 2
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.4byte .Lbegin_func_cu1
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.byte 3 /* DW_LNS_advance_line */
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.sleb128 3 /* ... to 4 */
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.byte 1 /* DW_LNS_copy */
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.byte 1 /* DW_LNS_copy (second time as an end-of-prologue marker) */
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.byte 0 /* DW_LNE_set_address */
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.uleb128 5
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.byte 2
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.4byte .Lend_func_cu1
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.byte 0 /* DW_LNE_end_of_sequence */
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.uleb128 1
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.byte 1
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.Lline1_end:
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