FreeCalypso > hg > freecalypso-sw

annotate rvinterf/ctracedec/decode.c @ 1034:405b5469abc4 default tip

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top README: repository change notice
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 12 Jun 2016 19:06:34 +0000
parents 4c6e7ada647b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
858
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1 /*
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2 * This module implements the actual decoding of compressed traces.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <stdio.h>
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7 #include <ctype.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include <stdlib.h>
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11
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12 extern char *str2ind_tab_filename;
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13 extern int str2ind_array_size;
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14 extern char **str2ind_orig_strings;
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15 extern char **str2ind_param_strings;
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16
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17 #define MAX_PRINTF_PARAMS 16
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18
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19 static int cindex, cindex_nchars;
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20 static u_char param_bytes_array[256];
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21 static int param_bytes_count;
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22 static char *format_string, *param_type_string;
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23 static int num_printf_params;
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24 static u_long printf_params[MAX_PRINTF_PARAMS];
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25 static char output_buf[2048];
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26
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27 decode_hex_digit(c)
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28 {
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29 if (isdigit(c))
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30 return(c - '0');
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31 else if (isupper(c))
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32 return(c - 'A' + 10);
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33 else
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34 return(c - 'a' + 10);
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35 }
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36
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37 static int
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38 decode_idx_and_params(line)
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39 char *line;
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40 {
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41 char *cp;
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42 u_char *dp;
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43
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44 for (cp = line; isdigit(*cp); cp++)
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45 ;
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46 if (*cp && *cp != ' ')
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47 return(-1);
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48 cindex = atoi(line);
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49 cindex_nchars = cp - line;
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50 for (dp = param_bytes_array; *cp; ) {
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51 if (*cp++ != ' ')
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52 return(-1);
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53 if (!isxdigit(cp[0]) || !isxdigit(cp[1]))
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54 return(-1);
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55 *dp++ = decode_hex_digit(cp[0]) << 4 | decode_hex_digit(cp[1]);
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56 cp += 2;
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57 }
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58 param_bytes_count = dp - param_bytes_array;
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59 return(0);
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60 }
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61
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62 static void
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63 decode_parameters(filename_for_errs, lineno_for_errs)
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64 char *filename_for_errs;
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65 {
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66 int pi, type;
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67 u_char *bp, *endp;
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68
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69 bp = param_bytes_array;
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70 endp = bp + param_bytes_count;
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71 for (pi = 0; pi < num_printf_params; pi++) {
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72 type = param_type_string[pi];
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73 switch (type) {
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74 case 'c':
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75 if (bp >= endp) {
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76 wrong_param_byte_count: fprintf(stderr,
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77 "%s line %d: wrong number of parameter bytes for %s entry #%d\n",
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78 filename_for_errs, lineno_for_errs,
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79 str2ind_tab_filename, cindex);
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80 exit(1);
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81 }
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82 printf_params[pi] = *bp++;
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83 continue;
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84 case 'i':
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85 case 'p':
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86 case '*':
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87 if (bp > endp - 4)
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88 goto wrong_param_byte_count;
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89 printf_params[pi] = (u_long) bp[0] |
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90 (u_long) bp[1] << 8 |
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91 (u_long) bp[2] << 16 |
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92 (u_long) bp[3] << 24;
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93 bp += 4;
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94 continue;
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95 case 's':
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96 printf_params[pi] = (u_long) bp;
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97 for (;;) {
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98 if (bp >= endp) {
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99 fprintf(stderr,
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100 "%s line %d: unterminated string parameter in compressed trace\n",
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101 filename_for_errs,
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102 lineno_for_errs);
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103 exit(1);
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104 }
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105 if (!*bp++)
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106 break;
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107 }
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108 continue;
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109 default:
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110 fprintf(stderr,
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111 "%s entry #%d: parameter type \'%c\' not supported\n",
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112 str2ind_tab_filename, cindex, type);
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113 exit(1);
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114 }
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115 }
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116 if (bp != endp)
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117 goto wrong_param_byte_count;
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118 }
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119
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120 process_ctrace_line(line, cindex_offset, filename_for_errs, lineno_for_errs)
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121 char *line, *filename_for_errs;
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122 {
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123 if (decode_idx_and_params(line + cindex_offset) < 0) {
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124 fprintf(stderr,
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125 "%s line %d: unable to decode compressed trace line\n",
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126 filename_for_errs, lineno_for_errs);
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127 exit(1);
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128 }
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129 if (cindex >= str2ind_array_size) {
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130 fprintf(stderr,
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131 "%s line %d: index %d exceeds the range of %s\n",
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132 filename_for_errs, lineno_for_errs, cindex,
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133 str2ind_tab_filename);
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134 exit(1);
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135 }
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136 format_string = str2ind_orig_strings[cindex];
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137 param_type_string = str2ind_param_strings[cindex];
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138 num_printf_params = strlen(param_type_string);
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139 if (num_printf_params > MAX_PRINTF_PARAMS) {
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140 fprintf(stderr,
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141 "error: entry #%d in %s has too many parameters\n",
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142 cindex, str2ind_tab_filename);
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143 exit(1);
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144 }
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145 decode_parameters(filename_for_errs, lineno_for_errs);
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146 ind2str_doprnt(format_string, printf_params, output_buf);
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147 printf("%.*s \"%s\"\n", cindex_offset + cindex_nchars, line,
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148 output_buf);
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149 return(0);
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150 }