| The Android Open Source Project | 441f72d | 2009-03-03 19:29:28 -0800 | [diff] [blame] | 1 | /* Helper functions for form handling. |
| 2 | Copyright (C) 2003, 2004 Red Hat, Inc. |
| 3 | Written by Ulrich Drepper <drepper@redhat.com>, 2003. |
| 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 | #include <string.h> |
| 21 | |
| 22 | #include "libdwP.h" |
| 23 | |
| 24 | |
| 25 | size_t |
| 26 | internal_function_def |
| 27 | __libdw_form_val_len (Dwarf *dbg, struct Dwarf_CU *cu, unsigned int form, |
| 28 | unsigned char *valp) |
| 29 | { |
| 30 | unsigned char *saved; |
| 31 | unsigned int u128; |
| 32 | size_t result; |
| 33 | |
| 34 | switch (form) |
| 35 | { |
| 36 | case DW_FORM_addr: |
| 37 | result = cu->address_size; |
| 38 | break; |
| 39 | |
| 40 | case DW_FORM_strp: |
| 41 | case DW_FORM_ref_addr: |
| 42 | result = cu->offset_size; |
| 43 | break; |
| 44 | |
| 45 | case DW_FORM_block1: |
| 46 | result = *valp + 1; |
| 47 | break; |
| 48 | |
| 49 | case DW_FORM_block2: |
| 50 | result = read_2ubyte_unaligned (dbg, valp) + 2; |
| 51 | break; |
| 52 | |
| 53 | case DW_FORM_block4: |
| 54 | result = read_4ubyte_unaligned (dbg, valp) + 4; |
| 55 | break; |
| 56 | |
| 57 | case DW_FORM_block: |
| 58 | saved = valp; |
| 59 | get_uleb128 (u128, valp); |
| 60 | result = u128 + (valp - saved); |
| 61 | break; |
| 62 | |
| 63 | case DW_FORM_ref1: |
| 64 | case DW_FORM_data1: |
| 65 | case DW_FORM_flag: |
| 66 | result = 1; |
| 67 | break; |
| 68 | |
| 69 | case DW_FORM_data2: |
| 70 | case DW_FORM_ref2: |
| 71 | result = 2; |
| 72 | break; |
| 73 | |
| 74 | case DW_FORM_data4: |
| 75 | case DW_FORM_ref4: |
| 76 | result = 4; |
| 77 | break; |
| 78 | |
| 79 | case DW_FORM_data8: |
| 80 | case DW_FORM_ref8: |
| 81 | result = 8; |
| 82 | break; |
| 83 | |
| 84 | case DW_FORM_string: |
| 85 | result = strlen ((char *) valp) + 1; |
| 86 | break; |
| 87 | |
| 88 | case DW_FORM_sdata: |
| 89 | case DW_FORM_udata: |
| 90 | case DW_FORM_ref_udata: |
| 91 | saved = valp; |
| 92 | get_uleb128 (u128, valp); |
| 93 | result = valp - saved; |
| 94 | break; |
| 95 | |
| 96 | case DW_FORM_indirect: |
| 97 | saved = valp; |
| 98 | get_uleb128 (u128, valp); |
| 99 | // XXX Is this really correct? |
| 100 | result = __libdw_form_val_len (dbg, cu, u128, valp); |
| 101 | if (result != (size_t) -1) |
| 102 | result += valp - saved; |
| 103 | break; |
| 104 | |
| 105 | default: |
| 106 | __libdw_seterrno (DWARF_E_INVALID_DWARF); |
| 107 | result = (size_t) -1l; |
| 108 | break; |
| 109 | } |
| 110 | |
| 111 | return result; |
| 112 | } |