1 | #include <string.h>
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2 | #include <mruby.h>
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3 | #include <mruby/irep.h>
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4 | #include <mruby/debug.h>
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5 |
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6 | static mrb_irep_debug_info_file*
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7 | get_file(mrb_irep_debug_info *info, uint32_t pc)
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8 | {
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9 | mrb_irep_debug_info_file **ret;
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10 | int32_t count;
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11 |
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12 | if (pc >= info->pc_count) { return NULL; }
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13 | /* get upper bound */
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14 | ret = info->files;
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15 | count = info->flen;
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16 | while (count > 0) {
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17 | int32_t step = count / 2;
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18 | mrb_irep_debug_info_file **it = ret + step;
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19 | if (!(pc < (*it)->start_pos)) {
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20 | ret = it + 1;
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21 | count -= step + 1;
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22 | }
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23 | else { count = step; }
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24 | }
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25 |
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26 | --ret;
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27 |
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28 | /* check returning file exists inside debug info */
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29 | mrb_assert(info->files <= ret && ret < (info->files + info->flen));
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30 | /* check pc is within the range of returning file */
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31 | mrb_assert((*ret)->start_pos <= pc &&
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32 | pc < (((ret + 1 - info->files) < info->flen)
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33 | ? (*(ret+1))->start_pos : info->pc_count));
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34 |
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35 | return *ret;
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36 | }
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37 |
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38 | static mrb_debug_line_type
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39 | select_line_type(const uint16_t *lines, size_t lines_len)
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40 | {
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41 | size_t line_count = 0;
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42 | int prev_line = -1;
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43 | size_t i;
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44 | for (i = 0; i < lines_len; ++i) {
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45 | if (lines[i] != prev_line) {
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46 | ++line_count;
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47 | }
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48 | }
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49 | return (sizeof(uint16_t) * lines_len) <= (sizeof(mrb_irep_debug_info_line) * line_count)
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50 | ? mrb_debug_line_ary : mrb_debug_line_flat_map;
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51 | }
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52 |
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53 | MRB_API char const*
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54 | mrb_debug_get_filename(mrb_state *mrb, mrb_irep *irep, ptrdiff_t pc)
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55 | {
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56 | if (irep && pc >= 0 && pc < irep->ilen) {
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57 | mrb_irep_debug_info_file* f = NULL;
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58 | if (!irep->debug_info) return NULL;
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59 | else if ((f = get_file(irep->debug_info, (uint32_t)pc))) {
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60 | return mrb_sym_name_len(mrb, f->filename_sym, NULL);
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61 | }
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62 | }
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63 | return NULL;
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64 | }
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65 |
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66 | MRB_API int32_t
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67 | mrb_debug_get_line(mrb_state *mrb, mrb_irep *irep, ptrdiff_t pc)
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68 | {
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69 | if (irep && pc >= 0 && pc < irep->ilen) {
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70 | mrb_irep_debug_info_file* f = NULL;
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71 | if (!irep->debug_info) {
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72 | return -1;
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73 | }
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74 | else if ((f = get_file(irep->debug_info, (uint32_t)pc))) {
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75 | switch (f->line_type) {
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76 | case mrb_debug_line_ary:
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77 | mrb_assert(f->start_pos <= pc && pc < (f->start_pos + f->line_entry_count));
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78 | return f->lines.ary[pc - f->start_pos];
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79 |
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80 | case mrb_debug_line_flat_map: {
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81 | /* get upper bound */
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82 | mrb_irep_debug_info_line *ret = f->lines.flat_map;
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83 | uint32_t count = f->line_entry_count;
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84 | while (count > 0) {
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85 | int32_t step = count / 2;
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86 | mrb_irep_debug_info_line *it = ret + step;
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87 | if (!(pc < it->start_pos)) {
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88 | ret = it + 1;
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89 | count -= step + 1;
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90 | }
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91 | else { count = step; }
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92 | }
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93 |
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94 | --ret;
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95 |
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96 | /* check line entry pointer range */
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97 | mrb_assert(f->lines.flat_map <= ret && ret < (f->lines.flat_map + f->line_entry_count));
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98 | /* check pc range */
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99 | mrb_assert(ret->start_pos <= pc &&
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100 | pc < (((uint32_t)(ret + 1 - f->lines.flat_map) < f->line_entry_count)
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101 | ? (ret+1)->start_pos : irep->debug_info->pc_count));
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102 |
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103 | return ret->line;
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104 | }
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105 | }
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106 | }
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107 | }
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108 | return -1;
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109 | }
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110 |
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111 | MRB_API mrb_irep_debug_info*
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112 | mrb_debug_info_alloc(mrb_state *mrb, mrb_irep *irep)
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113 | {
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114 | static const mrb_irep_debug_info initial = { 0, 0, NULL };
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115 | mrb_irep_debug_info *ret;
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116 |
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117 | mrb_assert(!irep->debug_info);
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118 | ret = (mrb_irep_debug_info *)mrb_malloc(mrb, sizeof(*ret));
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119 | *ret = initial;
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120 | irep->debug_info = ret;
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121 | return ret;
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122 | }
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123 |
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124 | MRB_API mrb_irep_debug_info_file*
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125 | mrb_debug_info_append_file(mrb_state *mrb, mrb_irep_debug_info *d,
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126 | const char *filename, uint16_t *lines,
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127 | uint32_t start_pos, uint32_t end_pos)
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128 | {
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129 | mrb_irep_debug_info_file *f;
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130 | uint32_t file_pc_count;
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131 | size_t fn_len;
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132 | uint32_t i;
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133 |
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134 | if (!d) return NULL;
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135 | if (start_pos == end_pos) return NULL;
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136 |
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137 | mrb_assert(filename);
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138 | mrb_assert(lines);
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139 |
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140 | if (d->flen > 0) {
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141 | const char *fn = mrb_sym_name_len(mrb, d->files[d->flen - 1]->filename_sym, NULL);
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142 | if (strcmp(filename, fn) == 0)
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143 | return NULL;
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144 | }
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145 |
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146 | f = (mrb_irep_debug_info_file*)mrb_malloc(mrb, sizeof(*f));
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147 | d->files = (mrb_irep_debug_info_file**)(
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148 | d->files
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149 | ? mrb_realloc(mrb, d->files, sizeof(mrb_irep_debug_info_file*) * (d->flen + 1))
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150 | : mrb_malloc(mrb, sizeof(mrb_irep_debug_info_file*)));
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151 | d->files[d->flen++] = f;
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152 |
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153 | file_pc_count = end_pos - start_pos;
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154 |
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155 | f->start_pos = start_pos;
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156 | d->pc_count = end_pos;
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157 |
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158 | fn_len = strlen(filename);
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159 | f->filename_sym = mrb_intern(mrb, filename, fn_len);
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160 |
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161 | f->line_type = select_line_type(lines + start_pos, end_pos - start_pos);
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162 | f->lines.ptr = NULL;
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163 |
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164 | switch (f->line_type) {
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165 | case mrb_debug_line_ary:
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166 | f->line_entry_count = file_pc_count;
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167 | f->lines.ary = (uint16_t*)mrb_malloc(mrb, sizeof(uint16_t) * file_pc_count);
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168 | for (i = 0; i < file_pc_count; ++i) {
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169 | f->lines.ary[i] = lines[start_pos + i];
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170 | }
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171 | break;
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172 |
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173 | case mrb_debug_line_flat_map: {
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174 | uint16_t prev_line = 0;
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175 | mrb_irep_debug_info_line m;
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176 | f->lines.flat_map = (mrb_irep_debug_info_line*)mrb_malloc(mrb, sizeof(mrb_irep_debug_info_line) * 1);
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177 | f->line_entry_count = 0;
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178 | for (i = 0; i < file_pc_count; ++i) {
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179 | if (lines[start_pos + i] == prev_line) { continue; }
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180 |
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181 | f->lines.flat_map = (mrb_irep_debug_info_line*)mrb_realloc(
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182 | mrb, f->lines.flat_map,
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183 | sizeof(mrb_irep_debug_info_line) * (f->line_entry_count + 1));
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184 | m.start_pos = start_pos + i;
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185 | m.line = lines[start_pos + i];
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186 | f->lines.flat_map[f->line_entry_count] = m;
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187 |
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188 | /* update */
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189 | ++f->line_entry_count;
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190 | prev_line = lines[start_pos + i];
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191 | }
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192 | } break;
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193 |
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194 | default: mrb_assert(0); break;
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195 | }
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196 |
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197 | return f;
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198 | }
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199 |
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200 | MRB_API void
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201 | mrb_debug_info_free(mrb_state *mrb, mrb_irep_debug_info *d)
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202 | {
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203 | uint32_t i;
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204 |
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205 | if (!d) { return; }
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206 |
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207 | for (i = 0; i < d->flen; ++i) {
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208 | mrb_assert(d->files[i]);
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209 | mrb_free(mrb, d->files[i]->lines.ptr);
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210 | mrb_free(mrb, d->files[i]);
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211 | }
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212 | mrb_free(mrb, d->files);
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213 | mrb_free(mrb, d);
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214 | }
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