src/common/bytecode/bytecode.h

   1 /*
   2  * Copyright 2020 EfficiOS, Inc.
   3  *
   4  * SPDX-License-Identifier: LGPL-2.1-only
   5  *
   6  */
   7
   8 #ifndef LTTNG_COMMON_BYTECODE_H
   9 #define LTTNG_COMMON_BYTECODE_H
  10
  11 #include <stdint.h>
  12
  13 #include "common/macros.h"
  14 #include "common/sessiond-comm/sessiond-comm.h"
  15
  16 /*
  17  * offsets are absolute from start of bytecode.
  18  */
  19
  20 struct field_ref {
  21         /* Initially, symbol offset. After link, field offset. */
  22         uint16_t offset;
  23 } LTTNG_PACKED;
  24
  25 struct get_symbol {
  26         /* Symbol offset. */
  27         uint16_t offset;
  28 } LTTNG_PACKED;
  29
  30 struct get_index_u16 {
  31         uint16_t index;
  32 } LTTNG_PACKED;
  33
  34 struct get_index_u64 {
  35         uint64_t index;
  36 } LTTNG_PACKED;
  37
  38 struct literal_numeric {
  39         int64_t v;
  40 } LTTNG_PACKED;
  41
  42 struct literal_double {
  43         double v;
  44 } LTTNG_PACKED;
  45
  46 struct literal_string {
  47         char string[0];
  48 } LTTNG_PACKED;
  49
  50 enum bytecode_op {
  51         BYTECODE_OP_UNKNOWN                             = 0,
  52
  53         BYTECODE_OP_RETURN                              = 1,
  54
  55         /* binary */
  56         BYTECODE_OP_MUL                                 = 2,
  57         BYTECODE_OP_DIV                                 = 3,
  58         BYTECODE_OP_MOD                                 = 4,
  59         BYTECODE_OP_PLUS                                = 5,
  60         BYTECODE_OP_MINUS                               = 6,
  61         BYTECODE_OP_BIT_RSHIFT                          = 7,
  62         BYTECODE_OP_BIT_LSHIFT                          = 8,
  63         BYTECODE_OP_BIT_AND                             = 9,
  64         BYTECODE_OP_BIT_OR                              = 10,
  65         BYTECODE_OP_BIT_XOR                             = 11,
  66
  67         /* binary comparators */
  68         BYTECODE_OP_EQ                                  = 12,
  69         BYTECODE_OP_NE                                  = 13,
  70         BYTECODE_OP_GT                                  = 14,
  71         BYTECODE_OP_LT                                  = 15,
  72         BYTECODE_OP_GE                                  = 16,
  73         BYTECODE_OP_LE                                  = 17,
  74
  75         /* string binary comparator: apply to  */
  76         BYTECODE_OP_EQ_STRING                           = 18,
  77         BYTECODE_OP_NE_STRING                           = 19,
  78         BYTECODE_OP_GT_STRING                           = 20,
  79         BYTECODE_OP_LT_STRING                           = 21,
  80         BYTECODE_OP_GE_STRING                           = 22,
  81         BYTECODE_OP_LE_STRING                           = 23,
  82
  83         /* s64 binary comparator */
  84         BYTECODE_OP_EQ_S64                              = 24,
  85         BYTECODE_OP_NE_S64                              = 25,
  86         BYTECODE_OP_GT_S64                              = 26,
  87         BYTECODE_OP_LT_S64                              = 27,
  88         BYTECODE_OP_GE_S64                              = 28,
  89         BYTECODE_OP_LE_S64                              = 29,
  90
  91         /* double binary comparator */
  92         BYTECODE_OP_EQ_DOUBLE                           = 30,
  93         BYTECODE_OP_NE_DOUBLE                           = 31,
  94         BYTECODE_OP_GT_DOUBLE                           = 32,
  95         BYTECODE_OP_LT_DOUBLE                           = 33,
  96         BYTECODE_OP_GE_DOUBLE                           = 34,
  97         BYTECODE_OP_LE_DOUBLE                           = 35,
  98
  99         /* Mixed S64-double binary comparators */
 100         BYTECODE_OP_EQ_DOUBLE_S64                       = 36,
 101         BYTECODE_OP_NE_DOUBLE_S64                       = 37,
 102         BYTECODE_OP_GT_DOUBLE_S64                       = 38,
 103         BYTECODE_OP_LT_DOUBLE_S64                       = 39,
 104         BYTECODE_OP_GE_DOUBLE_S64                       = 40,
 105         BYTECODE_OP_LE_DOUBLE_S64                       = 41,
 106
 107         BYTECODE_OP_EQ_S64_DOUBLE                       = 42,
 108         BYTECODE_OP_NE_S64_DOUBLE                       = 43,
 109         BYTECODE_OP_GT_S64_DOUBLE                       = 44,
 110         BYTECODE_OP_LT_S64_DOUBLE                       = 45,
 111         BYTECODE_OP_GE_S64_DOUBLE                       = 46,
 112         BYTECODE_OP_LE_S64_DOUBLE                       = 47,
 113
 114         /* unary */
 115         BYTECODE_OP_UNARY_PLUS                          = 48,
 116         BYTECODE_OP_UNARY_MINUS                         = 49,
 117         BYTECODE_OP_UNARY_NOT                           = 50,
 118         BYTECODE_OP_UNARY_PLUS_S64                      = 51,
 119         BYTECODE_OP_UNARY_MINUS_S64                     = 52,
 120         BYTECODE_OP_UNARY_NOT_S64                       = 53,
 121         BYTECODE_OP_UNARY_PLUS_DOUBLE                   = 54,
 122         BYTECODE_OP_UNARY_MINUS_DOUBLE                  = 55,
 123         BYTECODE_OP_UNARY_NOT_DOUBLE                    = 56,
 124
 125         /* logical */
 126         BYTECODE_OP_AND                                 = 57,
 127         BYTECODE_OP_OR                                  = 58,
 128
 129         /* load field ref */
 130         BYTECODE_OP_LOAD_FIELD_REF                      = 59,
 131         BYTECODE_OP_LOAD_FIELD_REF_STRING               = 60,
 132         BYTECODE_OP_LOAD_FIELD_REF_SEQUENCE             = 61,
 133         BYTECODE_OP_LOAD_FIELD_REF_S64                  = 62,
 134         BYTECODE_OP_LOAD_FIELD_REF_DOUBLE               = 63,
 135
 136         /* load immediate from operand */
 137         BYTECODE_OP_LOAD_STRING                         = 64,
 138         BYTECODE_OP_LOAD_S64                            = 65,
 139         BYTECODE_OP_LOAD_DOUBLE                         = 66,
 140
 141         /* cast */
 142         BYTECODE_OP_CAST_TO_S64                         = 67,
 143         BYTECODE_OP_CAST_DOUBLE_TO_S64                  = 68,
 144         BYTECODE_OP_CAST_NOP                            = 69,
 145
 146         /* get context ref */
 147         BYTECODE_OP_GET_CONTEXT_REF                     = 70,
 148         BYTECODE_OP_GET_CONTEXT_REF_STRING              = 71,
 149         BYTECODE_OP_GET_CONTEXT_REF_S64                 = 72,
 150         BYTECODE_OP_GET_CONTEXT_REF_DOUBLE              = 73,
 151
 152         /* load userspace field ref */
 153         BYTECODE_OP_LOAD_FIELD_REF_USER_STRING          = 74,
 154         BYTECODE_OP_LOAD_FIELD_REF_USER_SEQUENCE        = 75,
 155
 156         /*
 157          * load immediate star globbing pattern (literal string)
 158          * from immediate
 159          */
 160         BYTECODE_OP_LOAD_STAR_GLOB_STRING               = 76,
 161
 162         /* globbing pattern binary operator: apply to */
 163         BYTECODE_OP_EQ_STAR_GLOB_STRING                 = 77,
 164         BYTECODE_OP_NE_STAR_GLOB_STRING                 = 78,
 165
 166         /*
 167          * Instructions for recursive traversal through composed types.
 168          */
 169         BYTECODE_OP_GET_CONTEXT_ROOT                    = 79,
 170         BYTECODE_OP_GET_APP_CONTEXT_ROOT                = 80,
 171         BYTECODE_OP_GET_PAYLOAD_ROOT                    = 81,
 172
 173         BYTECODE_OP_GET_SYMBOL                          = 82,
 174         BYTECODE_OP_GET_SYMBOL_FIELD                    = 83,
 175         BYTECODE_OP_GET_INDEX_U16                       = 84,
 176         BYTECODE_OP_GET_INDEX_U64                       = 85,
 177
 178         BYTECODE_OP_LOAD_FIELD                          = 86,
 179         BYTECODE_OP_LOAD_FIELD_S8                       = 87,
 180         BYTECODE_OP_LOAD_FIELD_S16                      = 88,
 181         BYTECODE_OP_LOAD_FIELD_S32                      = 89,
 182         BYTECODE_OP_LOAD_FIELD_S64                      = 90,
 183         BYTECODE_OP_LOAD_FIELD_U8                       = 91,
 184         BYTECODE_OP_LOAD_FIELD_U16                      = 92,
 185         BYTECODE_OP_LOAD_FIELD_U32                      = 93,
 186         BYTECODE_OP_LOAD_FIELD_U64                      = 94,
 187         BYTECODE_OP_LOAD_FIELD_STRING                   = 95,
 188         BYTECODE_OP_LOAD_FIELD_SEQUENCE                 = 96,
 189         BYTECODE_OP_LOAD_FIELD_DOUBLE                   = 97,
 190
 191         BYTECODE_OP_UNARY_BIT_NOT                       = 98,
 192
 193         BYTECODE_OP_RETURN_S64                          = 99,
 194
 195         NR_BYTECODE_OPS,
 196 };
 197
 198 typedef uint8_t bytecode_opcode_t;
 199
 200 struct load_op {
 201         bytecode_opcode_t op;
 202
 203         /*
 204          * data to load. Size known by enum bytecode_opcode_t and null-term
 205          * char.
 206          */
 207         char data[0];
 208 } LTTNG_PACKED;
 209
 210 struct binary_op {
 211         bytecode_opcode_t op;
 212 } LTTNG_PACKED;
 213
 214 struct unary_op {
 215         bytecode_opcode_t op;
 216 } LTTNG_PACKED;
 217
 218 /* skip_offset is absolute from start of bytecode */
 219 struct logical_op {
 220         bytecode_opcode_t op;
 221         uint16_t skip_offset;   /* bytecode insn, if skip second test */
 222 } LTTNG_PACKED;
 223
 224 struct cast_op {
 225         bytecode_opcode_t op;
 226 } LTTNG_PACKED;
 227
 228 struct return_op {
 229         bytecode_opcode_t op;
 230 } LTTNG_PACKED;
 231
 232 struct lttng_bytecode_alloc {
 233         uint32_t alloc_len;
 234         struct lttng_bytecode b;
 235 };
 236
 237 LTTNG_HIDDEN int bytecode_init(struct lttng_bytecode_alloc **fb);
 238 LTTNG_HIDDEN int32_t bytecode_reserve(struct lttng_bytecode_alloc **fb,
 239                 uint32_t align, uint32_t len);
 240 LTTNG_HIDDEN int bytecode_push(struct lttng_bytecode_alloc **fb,
 241                 const void *data, uint32_t align, uint32_t len);
 242 LTTNG_HIDDEN int bytecode_push_logical(struct lttng_bytecode_alloc **fb,
 243                 struct logical_op *data, uint32_t align, uint32_t len,
 244                 uint16_t *skip_offset);
 245 LTTNG_HIDDEN int bytecode_push_get_payload_root(
 246                 struct lttng_bytecode_alloc **bytecode);
 247 LTTNG_HIDDEN int bytecode_push_get_context_root(
 248                 struct lttng_bytecode_alloc **bytecode);
 249 LTTNG_HIDDEN int bytecode_push_get_app_context_root(
 250                 struct lttng_bytecode_alloc **bytecode);
 251 LTTNG_HIDDEN int bytecode_push_get_index_u64(
 252                 struct lttng_bytecode_alloc **bytecode, uint64_t index);
 253 LTTNG_HIDDEN int bytecode_push_get_symbol(
 254                 struct lttng_bytecode_alloc **bytecode,
 255                 struct lttng_bytecode_alloc **bytecode_reloc,
 256                 const char *symbol);
 257 LTTNG_HIDDEN struct lttng_bytecode *bytecode_copy(
 258                 const struct lttng_bytecode *orig_f);
 259
 260 static inline
 261 unsigned int bytecode_get_len(struct lttng_bytecode *bytecode)
 262 {
 263         return bytecode->len;
 264 }
 265
 266 #endif /* LTTNG_COMMON_BYTECODE_H */