common: add more bytecode helpers
authorSimon Marchi <simon.marchi@efficios.com>
Mon, 6 Apr 2020 20:43:09 +0000 (16:43 -0400)
committerJérémie Galarneau <jeremie.galarneau@efficios.com>
Tue, 9 Mar 2021 04:51:11 +0000 (23:51 -0500)
The common/bytecode/bytecode.c file already contains some helper
functions that are used build bytecode. A following patch will require
helpers for a few more operations. This patch factors them out of the
filter-visitor-generate-bytecode.c file.

No functional changes intended.

Change-Id: I013e0dad3e0264d062e3e8733c05f7fbb4bda70c
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Depends-on: lttng-ust: I5a800fc92e588c2a6a0e26282b0ad5f31c044479

src/common/bytecode/bytecode.c
src/common/bytecode/bytecode.h
src/common/filter/filter-visitor-generate-bytecode.c

index 4f8c325b5da6a6734be6255f64ea07f4ef221f40..fb8985a00dd2704a293427543173ebff980e85fa 100644 (file)
@@ -100,6 +100,155 @@ int bytecode_push_logical(struct lttng_bytecode_alloc **fb,
        return 0;
 }
 
+LTTNG_HIDDEN
+int bytecode_push_get_payload_root(struct lttng_bytecode_alloc **bytecode)
+{
+       int ret;
+       struct load_op *insn;
+       const uint32_t insn_len = sizeof(struct load_op);
+
+       insn = calloc(insn_len, 1);
+       if (!insn) {
+               ret = -ENOMEM;
+               goto end;
+       }
+
+       insn->op = BYTECODE_OP_GET_PAYLOAD_ROOT;
+       ret = bytecode_push(bytecode, insn, 1, insn_len);
+       free(insn);
+end:
+       return ret;
+}
+
+LTTNG_HIDDEN
+int bytecode_push_get_context_root(struct lttng_bytecode_alloc **bytecode)
+{
+       int ret;
+       struct load_op *insn;
+       const uint32_t insn_len = sizeof(struct load_op);
+
+       insn = calloc(insn_len, 1);
+       if (!insn) {
+               ret = -ENOMEM;
+               goto end;
+       }
+
+       insn->op = BYTECODE_OP_GET_CONTEXT_ROOT;
+       ret = bytecode_push(bytecode, insn, 1, insn_len);
+       free(insn);
+end:
+       return ret;
+}
+
+LTTNG_HIDDEN
+int bytecode_push_get_app_context_root(struct lttng_bytecode_alloc **bytecode)
+{
+       int ret;
+       struct load_op *insn;
+       const uint32_t insn_len = sizeof(struct load_op);
+
+       insn = calloc(insn_len, 1);
+       if (!insn) {
+               ret = -ENOMEM;
+               goto end;
+       }
+
+       insn->op = BYTECODE_OP_GET_APP_CONTEXT_ROOT;
+       ret = bytecode_push(bytecode, insn, 1, insn_len);
+       free(insn);
+end:
+       return ret;
+}
+
+LTTNG_HIDDEN
+int bytecode_push_get_index_u64(struct lttng_bytecode_alloc **bytecode,
+               uint64_t index)
+{
+       int ret;
+       struct load_op *insn;
+       struct get_index_u64 index_op_data;
+       const uint32_t insn_len =
+                       sizeof(struct load_op) + sizeof(struct get_index_u64);
+
+       insn = calloc(insn_len, 1);
+       if (!insn) {
+               ret = -ENOMEM;
+               goto end;
+       }
+
+       insn->op = BYTECODE_OP_GET_INDEX_U64;
+       index_op_data.index = index;
+       memcpy(insn->data, &index_op_data, sizeof(index));
+       ret = bytecode_push(bytecode, insn, 1, insn_len);
+
+       free(insn);
+end:
+       return ret;
+}
+
+LTTNG_HIDDEN
+int bytecode_push_get_symbol(struct lttng_bytecode_alloc **bytecode,
+               struct lttng_bytecode_alloc **bytecode_reloc,
+               const char *symbol)
+{
+       int ret;
+       struct load_op *insn;
+       struct get_symbol symbol_offset;
+       uint32_t reloc_offset_u32;
+       uint16_t reloc_offset;
+       uint32_t bytecode_reloc_offset_u32;
+       const uint32_t insn_len =
+                       sizeof(struct load_op) + sizeof(struct get_symbol);
+
+       insn = calloc(insn_len, 1);
+       if (!insn) {
+               ret = -ENOMEM;
+               goto end;
+       }
+
+       insn->op = BYTECODE_OP_GET_SYMBOL;
+
+       /*
+        * Get offset in the reloc portion at which the symbol name
+        * will end up at (GET_SYMBOL's operand points there).
+        */
+       bytecode_reloc_offset_u32 = bytecode_get_len(&(*bytecode_reloc)->b) +
+                       sizeof(reloc_offset);
+       symbol_offset.offset = (uint16_t) bytecode_reloc_offset_u32;
+       memcpy(insn->data, &symbol_offset, sizeof(symbol_offset));
+
+       /*
+        * Get offset in the bytecode where the opcode will end up at,
+        * the reloc offset points to it.
+        */
+       reloc_offset_u32 = bytecode_get_len(&(*bytecode)->b);
+       if (reloc_offset_u32 > LTTNG_FILTER_MAX_LEN - 1) {
+               ret = -EINVAL;
+               goto end;
+       }
+       reloc_offset = (uint16_t) reloc_offset_u32;
+
+       /* Append op in bytecode. */
+       ret = bytecode_push(bytecode, insn, 1, insn_len);
+       if (ret) {
+               goto end;
+       }
+
+       /* Append reloc offset. */
+       ret = bytecode_push(bytecode_reloc, &reloc_offset,
+                       1, sizeof(reloc_offset));
+       if (ret) {
+               goto end;
+       }
+
+       /* Append symbol name. */
+       ret = bytecode_push(bytecode_reloc, symbol, 1, strlen(symbol) + 1);
+
+end:
+       free(insn);
+       return ret;
+}
+
 /*
  * Allocate an lttng_bytecode object and copy the given original bytecode.
  *
index 151ca8a0fb00d0d0273d5304b415984b9f84759f..498f7f0001e11fda2bd5c7fc0793b2feee6619ee 100644 (file)
@@ -245,6 +245,19 @@ LTTNG_HIDDEN int bytecode_push_logical(struct lttng_bytecode_alloc **fb,
 LTTNG_HIDDEN struct lttng_bytecode *lttng_bytecode_copy(
                const struct lttng_bytecode *orig_f);
 
+LTTNG_HIDDEN int bytecode_push_get_payload_root(
+               struct lttng_bytecode_alloc **bytecode);
+LTTNG_HIDDEN int bytecode_push_get_context_root(
+               struct lttng_bytecode_alloc **bytecode);
+LTTNG_HIDDEN int bytecode_push_get_app_context_root(
+               struct lttng_bytecode_alloc **bytecode);
+LTTNG_HIDDEN int bytecode_push_get_index_u64(
+               struct lttng_bytecode_alloc **bytecode, uint64_t index);
+LTTNG_HIDDEN int bytecode_push_get_symbol(
+               struct lttng_bytecode_alloc **bytecode,
+               struct lttng_bytecode_alloc **bytecode_reloc,
+               const char *symbol);
+
 static inline
 unsigned int bytecode_get_len(struct lttng_bytecode *bytecode)
 {
index 51ebad130c3a30a9db044f4d3171d9a805728848..e0ba9fd0a43d342ca3540cc6785dddb57f1b898a 100644 (file)
@@ -240,124 +240,55 @@ int visit_node_load_expression(struct filter_parser_ctx *ctx,
                switch (op->type) {
                case IR_LOAD_EXPRESSION_GET_CONTEXT_ROOT:
                {
-                       struct load_op *insn;
-                       uint32_t insn_len = sizeof(struct load_op);
-                       int ret;
+                       const int ret = bytecode_push_get_context_root(&ctx->bytecode);
 
-                       insn = calloc(insn_len, 1);
-                       if (!insn)
-                               return -ENOMEM;
-                       insn->op = BYTECODE_OP_GET_CONTEXT_ROOT;
-                       ret = bytecode_push(&ctx->bytecode, insn, 1, insn_len);
-                       free(insn);
                        if (ret) {
                                return ret;
                        }
+
                        break;
                }
                case IR_LOAD_EXPRESSION_GET_APP_CONTEXT_ROOT:
                {
-                       struct load_op *insn;
-                       uint32_t insn_len = sizeof(struct load_op);
-                       int ret;
+                       const int ret = bytecode_push_get_app_context_root(&ctx->bytecode);
 
-                       insn = calloc(insn_len, 1);
-                       if (!insn)
-                               return -ENOMEM;
-                       insn->op = BYTECODE_OP_GET_APP_CONTEXT_ROOT;
-                       ret = bytecode_push(&ctx->bytecode, insn, 1, insn_len);
-                       free(insn);
                        if (ret) {
                                return ret;
                        }
+
                        break;
                }
                case IR_LOAD_EXPRESSION_GET_PAYLOAD_ROOT:
                {
-                       struct load_op *insn;
-                       uint32_t insn_len = sizeof(struct load_op);
-                       int ret;
+                       const int ret = bytecode_push_get_payload_root(&ctx->bytecode);
 
-                       insn = calloc(insn_len, 1);
-                       if (!insn)
-                               return -ENOMEM;
-                       insn->op = BYTECODE_OP_GET_PAYLOAD_ROOT;
-                       ret = bytecode_push(&ctx->bytecode, insn, 1, insn_len);
-                       free(insn);
                        if (ret) {
                                return ret;
                        }
+
                        break;
                }
                case IR_LOAD_EXPRESSION_GET_SYMBOL:
                {
-                       struct load_op *insn;
-                       uint32_t insn_len = sizeof(struct load_op)
-                               + sizeof(struct get_symbol);
-                       struct get_symbol symbol_offset;
-                       uint32_t reloc_offset_u32;
-                       uint16_t reloc_offset;
-                       uint32_t bytecode_reloc_offset_u32;
-                       int ret;
+                       const int ret = bytecode_push_get_symbol(
+                                       &ctx->bytecode,
+                                       &ctx->bytecode_reloc,
+                                       op->u.symbol);
 
-                       insn = calloc(insn_len, 1);
-                       if (!insn)
-                               return -ENOMEM;
-                       insn->op = BYTECODE_OP_GET_SYMBOL;
-                       bytecode_reloc_offset_u32 =
-                                       bytecode_get_len(&ctx->bytecode_reloc->b)
-                                       + sizeof(reloc_offset);
-                       symbol_offset.offset =
-                                       (uint16_t) bytecode_reloc_offset_u32;
-                       memcpy(insn->data, &symbol_offset,
-                                       sizeof(symbol_offset));
-                       /* reloc_offset points to struct load_op */
-                       reloc_offset_u32 = bytecode_get_len(&ctx->bytecode->b);
-                       if (reloc_offset_u32 > LTTNG_FILTER_MAX_LEN - 1) {
-                               free(insn);
-                               return -EINVAL;
-                       }
-                       reloc_offset = (uint16_t) reloc_offset_u32;
-                       ret = bytecode_push(&ctx->bytecode, insn, 1, insn_len);
-                       if (ret) {
-                               free(insn);
-                               return ret;
-                       }
-                       /* append reloc */
-                       ret = bytecode_push(&ctx->bytecode_reloc, &reloc_offset,
-                                       1, sizeof(reloc_offset));
-                       if (ret) {
-                               free(insn);
-                               return ret;
-                       }
-                       ret = bytecode_push(&ctx->bytecode_reloc,
-                                       op->u.symbol,
-                                       1, strlen(op->u.symbol) + 1);
-                       free(insn);
                        if (ret) {
                                return ret;
                        }
+
                        break;
                }
                case IR_LOAD_EXPRESSION_GET_INDEX:
                {
-                       struct load_op *insn;
-                       uint32_t insn_len = sizeof(struct load_op)
-                               + sizeof(struct get_index_u64);
-                       struct get_index_u64 index;
-                       int ret;
+                       const int ret = bytecode_push_get_index_u64(&ctx->bytecode, op->u.index);
 
-                       insn = calloc(insn_len, 1);
-                       if (!insn)
-                               return -ENOMEM;
-                       insn->op = BYTECODE_OP_GET_INDEX_U64;
-                       index.index = op->u.index;
-                       memcpy(insn->data, &index, sizeof(index));
-                       ret = bytecode_push(&ctx->bytecode, insn, 1, insn_len);
-                       free(insn);
                        if (ret) {
                                return ret;
                        }
+
                        break;
                }
                case IR_LOAD_EXPRESSION_LOAD_FIELD:
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