| Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame^] | 1 | /* Return constant value of given attribute type associated with die. |
| 2 | Copyright (C) 2000, 2001, 2002 Red Hat, Inc. |
| 3 | Written by Ulrich Drepper <drepper@redhat.com>, 2000. |
| 4 | |
| 5 | This program is Open Source software; you can redistribute it and/or |
| 6 | modify it under the terms of the Open Software License version 1.0 as |
| 7 | published by the Open Source Initiative. |
| 8 | |
| 9 | You should have received a copy of the Open Software License along |
| 10 | with this program; if not, you may obtain a copy of the Open Software |
| 11 | License version 1.0 from http://www.opensource.org/licenses/osl.php or |
| 12 | by writing the Open Source Initiative c/o Lawrence Rosen, Esq., |
| 13 | 3001 King Ranch Road, Ukiah, CA 95482. */ |
| 14 | |
| 15 | #ifdef HAVE_CONFIG_H |
| 16 | # include <config.h> |
| 17 | #endif |
| 18 | |
| 19 | #include <dwarf.h> |
| 20 | |
| 21 | #include <libdwarfP.h> |
| 22 | |
| 23 | |
| 24 | int |
| 25 | __libdwarf_getconstant (die, name, return_size, error) |
| 26 | Dwarf_Die die; |
| 27 | Dwarf_Half name; |
| 28 | Dwarf_Unsigned *return_size; |
| 29 | Dwarf_Error *error; |
| 30 | { |
| 31 | Dwarf_Debug dbg = die->cu->dbg; |
| 32 | Dwarf_Small *die_addr; |
| 33 | Dwarf_Word u128; |
| 34 | Dwarf_Abbrev abbrev; |
| 35 | Dwarf_Small *attrp; |
| 36 | |
| 37 | /* Address of the given die. */ |
| 38 | die_addr = die->addr; |
| 39 | |
| 40 | /* Get abbrev code. */ |
| 41 | get_uleb128 (u128, die_addr); |
| 42 | /* And get the abbreviation itself. */ |
| 43 | abbrev = __libdwarf_get_abbrev (dbg, die->cu, u128, error); |
| 44 | if (abbrev == NULL) |
| 45 | return DW_DLV_ERROR; |
| 46 | |
| 47 | /* This is where the attributes start. */ |
| 48 | attrp = abbrev->attrp; |
| 49 | |
| 50 | /* Search the name attribute. */ |
| 51 | while (1) |
| 52 | { |
| 53 | Dwarf_Word attr_name; |
| 54 | Dwarf_Word attr_form; |
| 55 | |
| 56 | /* Are we still in bounds? */ |
| 57 | if (unlikely (attrp |
| 58 | >= ((Dwarf_Small *) dbg->sections[IDX_debug_abbrev].addr |
| 59 | + dbg->sections[IDX_debug_abbrev].size))) |
| 60 | { |
| 61 | __libdwarf_error (dbg, error, DW_E_INVALID_DWARF); |
| 62 | return DW_DLV_ERROR; |
| 63 | } |
| 64 | |
| 65 | /* Get attribute name and form. |
| 66 | |
| 67 | XXX We don't check whether this reads beyond the end of the |
| 68 | section. */ |
| 69 | get_uleb128 (attr_name, attrp); |
| 70 | get_uleb128 (attr_form, attrp); |
| 71 | |
| 72 | /* We can stop if we found the attribute with value zero. */ |
| 73 | if (attr_name == 0 && attr_form == 0) |
| 74 | break; |
| 75 | |
| 76 | /* Is this the name attribute? */ |
| 77 | if (unlikely (attr_name == name)) |
| 78 | { |
| 79 | switch (attr_form) |
| 80 | { |
| 81 | case DW_FORM_data1: |
| 82 | *return_size = *die_addr; |
| 83 | break; |
| 84 | case DW_FORM_data2: |
| 85 | *return_size = read_2ubyte_unaligned (dbg, die_addr); |
| 86 | break; |
| 87 | case DW_FORM_data4: |
| 88 | *return_size = read_4ubyte_unaligned (dbg, die_addr); |
| 89 | break; |
| 90 | case DW_FORM_data8: |
| 91 | *return_size = read_8ubyte_unaligned (dbg, die_addr); |
| 92 | break; |
| 93 | case DW_FORM_sdata: |
| 94 | get_sleb128 (u128, die_addr); |
| 95 | *return_size = u128; |
| 96 | break; |
| 97 | case DW_FORM_udata: |
| 98 | get_uleb128 (u128, die_addr); |
| 99 | *return_size = u128; |
| 100 | break; |
| 101 | default: |
| 102 | __libdwarf_error (dbg, error, DW_E_NO_CONSTANT); |
| 103 | return DW_DLV_ERROR; |
| 104 | } |
| 105 | |
| 106 | return DW_DLV_OK; |
| 107 | } |
| 108 | |
| 109 | /* Skip over the rest of this attribute (if there is any). */ |
| 110 | if (attr_form != 0) |
| 111 | { |
| 112 | size_t len; |
| 113 | |
| 114 | if (unlikely (__libdwarf_form_val_len (dbg, die->cu, attr_form, |
| 115 | die_addr, &len, error) |
| 116 | != DW_DLV_OK)) |
| 117 | return DW_DLV_ERROR; |
| 118 | |
| 119 | die_addr += len; |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | /* No such attribute present. */ |
| 124 | return DW_DLV_NO_ENTRY; |
| 125 | } |