X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fbytecode%2Fbytecode.c;h=fb8985a00dd2704a293427543173ebff980e85fa;hp=4f8c325b5da6a6734be6255f64ea07f4ef221f40;hb=6afbab01c56b1a634c7071e1e885759ac4fd0b7f;hpb=2b00d46244cab86f1186a7b00cdc660f24a26f72

diff --git a/src/common/bytecode/bytecode.c b/src/common/bytecode/bytecode.c
index 4f8c325b5..fb8985a00 100644
--- a/src/common/bytecode/bytecode.c
+++ b/src/common/bytecode/bytecode.c
@@ -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.
  *