Peter Zijlstra | 7c6a1c6 | 2009-06-25 17:05:54 +0200 | [diff] [blame] | 1 | #include <sys/types.h> |
| 2 | #include <unistd.h> |
| 3 | #include <stdio.h> |
| 4 | #include <stdlib.h> |
| 5 | |
| 6 | #include "util.h" |
| 7 | #include "header.h" |
| 8 | |
| 9 | /* |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | struct perf_header_attr *perf_header_attr__new(struct perf_counter_attr *attr) |
| 14 | { |
| 15 | struct perf_header_attr *self = malloc(sizeof(*self)); |
| 16 | |
| 17 | if (!self) |
| 18 | die("nomem"); |
| 19 | |
| 20 | self->attr = *attr; |
| 21 | self->ids = 0; |
| 22 | self->size = 1; |
| 23 | self->id = malloc(sizeof(u64)); |
| 24 | |
| 25 | if (!self->id) |
| 26 | die("nomem"); |
| 27 | |
| 28 | return self; |
| 29 | } |
| 30 | |
| 31 | void perf_header_attr__add_id(struct perf_header_attr *self, u64 id) |
| 32 | { |
| 33 | int pos = self->ids; |
| 34 | |
| 35 | self->ids++; |
| 36 | if (self->ids > self->size) { |
| 37 | self->size *= 2; |
| 38 | self->id = realloc(self->id, self->size * sizeof(u64)); |
| 39 | if (!self->id) |
| 40 | die("nomem"); |
| 41 | } |
| 42 | self->id[pos] = id; |
| 43 | } |
| 44 | |
| 45 | /* |
| 46 | * |
| 47 | */ |
| 48 | |
| 49 | struct perf_header *perf_header__new(void) |
| 50 | { |
| 51 | struct perf_header *self = malloc(sizeof(*self)); |
| 52 | |
| 53 | if (!self) |
| 54 | die("nomem"); |
| 55 | |
| 56 | self->frozen = 0; |
| 57 | |
| 58 | self->attrs = 0; |
| 59 | self->size = 1; |
| 60 | self->attr = malloc(sizeof(void *)); |
| 61 | |
| 62 | if (!self->attr) |
| 63 | die("nomem"); |
| 64 | |
| 65 | self->data_offset = 0; |
| 66 | self->data_size = 0; |
| 67 | |
| 68 | return self; |
| 69 | } |
| 70 | |
| 71 | void perf_header__add_attr(struct perf_header *self, |
| 72 | struct perf_header_attr *attr) |
| 73 | { |
| 74 | int pos = self->attrs; |
| 75 | |
| 76 | if (self->frozen) |
| 77 | die("frozen"); |
| 78 | |
| 79 | self->attrs++; |
| 80 | if (self->attrs > self->size) { |
| 81 | self->size *= 2; |
| 82 | self->attr = realloc(self->attr, self->size * sizeof(void *)); |
| 83 | if (!self->attr) |
| 84 | die("nomem"); |
| 85 | } |
| 86 | self->attr[pos] = attr; |
| 87 | } |
| 88 | |
| 89 | static const char *__perf_magic = "PERFFILE"; |
| 90 | |
| 91 | #define PERF_MAGIC (*(u64 *)__perf_magic) |
| 92 | |
| 93 | struct perf_file_section { |
| 94 | u64 offset; |
| 95 | u64 size; |
| 96 | }; |
| 97 | |
| 98 | struct perf_file_attr { |
| 99 | struct perf_counter_attr attr; |
| 100 | struct perf_file_section ids; |
| 101 | }; |
| 102 | |
| 103 | struct perf_file_header { |
| 104 | u64 magic; |
| 105 | u64 size; |
| 106 | u64 attr_size; |
| 107 | struct perf_file_section attrs; |
| 108 | struct perf_file_section data; |
| 109 | }; |
| 110 | |
| 111 | static void do_write(int fd, void *buf, size_t size) |
| 112 | { |
| 113 | while (size) { |
| 114 | int ret = write(fd, buf, size); |
| 115 | |
| 116 | if (ret < 0) |
| 117 | die("failed to write"); |
| 118 | |
| 119 | size -= ret; |
| 120 | buf += ret; |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | void perf_header__write(struct perf_header *self, int fd) |
| 125 | { |
| 126 | struct perf_file_header f_header; |
| 127 | struct perf_file_attr f_attr; |
| 128 | struct perf_header_attr *attr; |
| 129 | int i; |
| 130 | |
| 131 | lseek(fd, sizeof(f_header), SEEK_SET); |
| 132 | |
| 133 | |
| 134 | for (i = 0; i < self->attrs; i++) { |
| 135 | attr = self->attr[i]; |
| 136 | |
| 137 | attr->id_offset = lseek(fd, 0, SEEK_CUR); |
| 138 | do_write(fd, attr->id, attr->ids * sizeof(u64)); |
| 139 | } |
| 140 | |
| 141 | |
| 142 | self->attr_offset = lseek(fd, 0, SEEK_CUR); |
| 143 | |
| 144 | for (i = 0; i < self->attrs; i++) { |
| 145 | attr = self->attr[i]; |
| 146 | |
| 147 | f_attr = (struct perf_file_attr){ |
| 148 | .attr = attr->attr, |
| 149 | .ids = { |
| 150 | .offset = attr->id_offset, |
| 151 | .size = attr->ids * sizeof(u64), |
| 152 | } |
| 153 | }; |
| 154 | do_write(fd, &f_attr, sizeof(f_attr)); |
| 155 | } |
| 156 | |
| 157 | |
| 158 | self->data_offset = lseek(fd, 0, SEEK_CUR); |
| 159 | |
| 160 | f_header = (struct perf_file_header){ |
| 161 | .magic = PERF_MAGIC, |
| 162 | .size = sizeof(f_header), |
| 163 | .attr_size = sizeof(f_attr), |
| 164 | .attrs = { |
| 165 | .offset = self->attr_offset, |
| 166 | .size = self->attrs * sizeof(f_attr), |
| 167 | }, |
| 168 | .data = { |
| 169 | .offset = self->data_offset, |
| 170 | .size = self->data_size, |
| 171 | }, |
| 172 | }; |
| 173 | |
| 174 | lseek(fd, 0, SEEK_SET); |
| 175 | do_write(fd, &f_header, sizeof(f_header)); |
| 176 | lseek(fd, self->data_offset + self->data_size, SEEK_SET); |
| 177 | |
| 178 | self->frozen = 1; |
| 179 | } |
| 180 | |
| 181 | static void do_read(int fd, void *buf, size_t size) |
| 182 | { |
| 183 | while (size) { |
| 184 | int ret = read(fd, buf, size); |
| 185 | |
| 186 | if (ret < 0) |
| 187 | die("failed to read"); |
| 188 | |
| 189 | size -= ret; |
| 190 | buf += ret; |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | struct perf_header *perf_header__read(int fd) |
| 195 | { |
| 196 | struct perf_header *self = perf_header__new(); |
| 197 | struct perf_file_header f_header; |
| 198 | struct perf_file_attr f_attr; |
| 199 | u64 f_id; |
| 200 | |
| 201 | int nr_attrs, nr_ids, i, j; |
| 202 | |
| 203 | lseek(fd, 0, SEEK_SET); |
| 204 | do_read(fd, &f_header, sizeof(f_header)); |
| 205 | |
| 206 | if (f_header.magic != PERF_MAGIC || |
| 207 | f_header.size != sizeof(f_header) || |
| 208 | f_header.attr_size != sizeof(f_attr)) |
| 209 | die("incompatible file format"); |
| 210 | |
| 211 | nr_attrs = f_header.attrs.size / sizeof(f_attr); |
| 212 | lseek(fd, f_header.attrs.offset, SEEK_SET); |
| 213 | |
| 214 | for (i = 0; i < nr_attrs; i++) { |
| 215 | struct perf_header_attr *attr; |
| 216 | off_t tmp = lseek(fd, 0, SEEK_CUR); |
| 217 | |
| 218 | do_read(fd, &f_attr, sizeof(f_attr)); |
| 219 | |
| 220 | attr = perf_header_attr__new(&f_attr.attr); |
| 221 | |
| 222 | nr_ids = f_attr.ids.size / sizeof(u64); |
| 223 | lseek(fd, f_attr.ids.offset, SEEK_SET); |
| 224 | |
| 225 | for (j = 0; j < nr_ids; j++) { |
| 226 | do_read(fd, &f_id, sizeof(f_id)); |
| 227 | |
| 228 | perf_header_attr__add_id(attr, f_id); |
| 229 | } |
| 230 | perf_header__add_attr(self, attr); |
| 231 | lseek(fd, tmp, SEEK_SET); |
| 232 | } |
| 233 | |
| 234 | self->data_offset = f_header.data.offset; |
| 235 | self->data_size = f_header.data.size; |
| 236 | |
| 237 | lseek(fd, self->data_offset + self->data_size, SEEK_SET); |
| 238 | |
| 239 | self->frozen = 1; |
| 240 | |
| 241 | return self; |
| 242 | } |