contrib/elftoolchain/libdwarf/dwarf_pro_expr.c

   1 /*-
   2  * Copyright (c) 2010 Kai Wang
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include "_libdwarf.h"
  28
  29 ELFTC_VCSID("$Id: dwarf_pro_expr.c 2074 2011-10-27 03:34:33Z jkoshy $");
  30
  31 static struct _Dwarf_P_Expr_Entry *
  32 _dwarf_add_expr(Dwarf_P_Expr expr, Dwarf_Small opcode, Dwarf_Unsigned val1,
  33     Dwarf_Unsigned val2, Dwarf_Error *error)
  34 {
  35         struct _Dwarf_P_Expr_Entry *ee;
  36         Dwarf_Debug dbg;
  37         int len;
  38
  39         dbg = expr->pe_dbg;
  40
  41         if (_dwarf_loc_expr_add_atom(dbg, NULL, NULL, opcode, val1, val2, &len,
  42             error) != DW_DLE_NONE)
  43                 return (NULL);
  44         assert(len > 0);
  45
  46         if ((ee = calloc(1, sizeof(*ee))) == NULL) {
  47                 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
  48                 return (NULL);
  49         }
  50
  51         STAILQ_INSERT_TAIL(&expr->pe_eelist, ee, ee_next);
  52
  53         ee->ee_loc.lr_atom = opcode;
  54         ee->ee_loc.lr_number = val1;
  55         ee->ee_loc.lr_number2 = val2;
  56         ee->ee_loc.lr_offset = expr->pe_length;
  57         expr->pe_length += len;
  58         expr->pe_invalid = 1;
  59
  60         return (ee);
  61 }
  62
  63 int
  64 _dwarf_expr_into_block(Dwarf_P_Expr expr, Dwarf_Error *error)
  65 {
  66         struct _Dwarf_P_Expr_Entry *ee;
  67         Dwarf_Debug dbg;
  68         int len, pos, ret;
  69
  70         dbg = expr->pe_dbg;
  71
  72         if (expr->pe_block != NULL) {
  73                 free(expr->pe_block);
  74                 expr->pe_block = NULL;
  75         }
  76
  77         if (expr->pe_length <= 0) {
  78                 DWARF_SET_ERROR(dbg, error, DW_DLE_EXPR_LENGTH_BAD);
  79                 return (DW_DLE_EXPR_LENGTH_BAD);
  80         }
  81
  82
  83         if ((expr->pe_block = calloc((size_t) expr->pe_length, 1)) == NULL) {
  84                 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
  85                 return (DW_DLE_MEMORY);
  86         }
  87
  88         pos = 0;
  89         STAILQ_FOREACH(ee, &expr->pe_eelist, ee_next) {
  90                 assert((Dwarf_Unsigned) pos < expr->pe_length);
  91                 ret = _dwarf_loc_expr_add_atom(dbg,
  92                     &expr->pe_block[pos], &expr->pe_block[expr->pe_length],
  93                     ee->ee_loc.lr_atom, ee->ee_loc.lr_number,
  94                     ee->ee_loc.lr_number2, &len, error);
  95                 assert(ret == DW_DLE_NONE);
  96                 assert(len > 0);
  97                 pos += len;
  98         }
  99
 100         expr->pe_invalid = 0;
 101
 102         return (DW_DLE_NONE);
 103 }
 104
 105 void
 106 _dwarf_expr_cleanup(Dwarf_P_Debug dbg)
 107 {
 108         Dwarf_P_Expr pe, tpe;
 109         struct _Dwarf_P_Expr_Entry *ee, *tee;
 110
 111         assert(dbg != NULL && dbg->dbg_mode == DW_DLC_WRITE);
 112
 113         STAILQ_FOREACH_SAFE(pe, &dbg->dbgp_pelist, pe_next, tpe) {
 114                 STAILQ_REMOVE(&dbg->dbgp_pelist, pe, _Dwarf_P_Expr, pe_next);
 115                 STAILQ_FOREACH_SAFE(ee, &pe->pe_eelist, ee_next, tee) {
 116                         STAILQ_REMOVE(&pe->pe_eelist, ee, _Dwarf_P_Expr_Entry,
 117                             ee_next);
 118                         free(ee);
 119                 }
 120                 if (pe->pe_block)
 121                         free(pe->pe_block);
 122                 free(pe);
 123         }
 124 }
 125
 126 Dwarf_P_Expr
 127 dwarf_new_expr(Dwarf_P_Debug dbg, Dwarf_Error *error)
 128 {
 129         Dwarf_P_Expr pe;
 130
 131         if (dbg == NULL) {
 132                 DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
 133                 return (DW_DLV_BADADDR);
 134         }
 135
 136         if ((pe = calloc(1, sizeof(struct _Dwarf_P_Expr))) == NULL) {
 137                 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
 138                 return (DW_DLV_BADADDR);
 139         }
 140         STAILQ_INIT(&pe->pe_eelist);
 141
 142         STAILQ_INSERT_TAIL(&dbg->dbgp_pelist, pe, pe_next);
 143         pe->pe_dbg = dbg;
 144
 145         return (pe);
 146 }
 147
 148 Dwarf_Unsigned
 149 dwarf_add_expr_gen(Dwarf_P_Expr expr, Dwarf_Small opcode, Dwarf_Unsigned val1,
 150     Dwarf_Unsigned val2, Dwarf_Error *error)
 151 {
 152
 153         if (expr == NULL) {
 154                 DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
 155                 return (DW_DLV_NOCOUNT);
 156         }
 157
 158         if (_dwarf_add_expr(expr, opcode, val1, val2, error) == NULL)
 159                 return (DW_DLV_NOCOUNT);
 160
 161         return (expr->pe_length);
 162 }
 163
 164 Dwarf_Unsigned
 165 dwarf_add_expr_addr(Dwarf_P_Expr expr, Dwarf_Unsigned address,
 166     Dwarf_Signed sym_index, Dwarf_Error *error)
 167 {
 168
 169         return (dwarf_add_expr_addr_b(expr, address, sym_index, error));
 170 }
 171
 172 Dwarf_Unsigned
 173 dwarf_add_expr_addr_b(Dwarf_P_Expr expr, Dwarf_Unsigned address,
 174     Dwarf_Unsigned sym_index, Dwarf_Error *error)
 175 {
 176         struct _Dwarf_P_Expr_Entry *ee;
 177
 178         if (expr == NULL) {
 179                 DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
 180                 return (DW_DLV_NOCOUNT);
 181         }
 182
 183         if ((ee = _dwarf_add_expr(expr, DW_OP_addr, address, 0, error)) == NULL)
 184                 return (DW_DLV_NOCOUNT);
 185
 186         ee->ee_sym = sym_index;
 187
 188         return (expr->pe_length);
 189 }
 190
 191 Dwarf_Unsigned
 192 dwarf_expr_current_offset(Dwarf_P_Expr expr, Dwarf_Error *error)
 193 {
 194
 195         if (expr == NULL) {
 196                 DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
 197                 return (DW_DLV_NOCOUNT);
 198         }
 199
 200         return (expr->pe_length);
 201 }
 202
 203 Dwarf_Addr
 204 dwarf_expr_into_block(Dwarf_P_Expr expr, Dwarf_Unsigned *length,
 205     Dwarf_Error *error)
 206 {
 207         Dwarf_Debug dbg;
 208
 209         dbg = expr != NULL ? expr->pe_dbg : NULL;
 210
 211         if (expr == NULL || length == NULL) {
 212                 DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
 213                 return ((Dwarf_Addr) (uintptr_t) DW_DLV_BADADDR);
 214         }
 215
 216         if (expr->pe_block == NULL || expr->pe_invalid)
 217                 if (_dwarf_expr_into_block(expr, error) != DW_DLE_NONE)
 218                         return ((Dwarf_Addr) (uintptr_t) DW_DLV_BADADDR);
 219
 220         *length = expr->pe_length;
 221
 222         return ((Dwarf_Addr) (uintptr_t) expr->pe_block);
 223 }