#include <assert.h>
#include <stddef.h>
+#include <common/bytecode/bytecode.h>
#include <common/error.h>
#include <common/macros.h>
#include <lttng/event-expr-internal.h>
+#include <lttng/event-expr.h>
+#include <stdio.h>
enum lttng_event_expr_type lttng_event_expr_get_type(
const struct lttng_event_expr *expr)
end:
return;
}
+
+static int event_expr_to_bytecode_recursive(const struct lttng_event_expr *expr,
+ struct lttng_bytecode_alloc **bytecode,
+ struct lttng_bytecode_alloc **bytecode_reloc)
+{
+ int status;
+ enum lttng_event_expr_status event_expr_status;
+
+ switch (lttng_event_expr_get_type(expr)) {
+ case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD:
+ {
+ const char *name;
+
+ status = bytecode_push_get_payload_root(bytecode);
+ if (status) {
+ ERR("Failed to get payload root from bytecode");
+ goto end;
+ }
+
+ name = lttng_event_expr_event_payload_field_get_name(expr);
+ if (!name) {
+ ERR("Failed to get payload field name from event expression");
+ status = -1;
+ goto end;
+ }
+
+ status = bytecode_push_get_symbol(
+ bytecode, bytecode_reloc, name);
+ if (status) {
+ ERR("Failed to push 'get symbol %s' in bytecode", name);
+ goto end;
+ }
+
+ break;
+ }
+ case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD:
+ {
+ const char *name;
+
+ status = bytecode_push_get_context_root(bytecode);
+ if (status) {
+ ERR("Failed to get context root from bytecode");
+ goto end;
+ }
+
+ name = lttng_event_expr_channel_context_field_get_name(expr);
+ if (!name) {
+ ERR("Failed to get channel context field name from event expression");
+ status = -1;
+ goto end;
+ }
+
+ status = bytecode_push_get_symbol(
+ bytecode, bytecode_reloc, name);
+ if (status) {
+ ERR("Failed to push 'get symbol %s' in bytecode", name);
+ goto end;
+ }
+
+ break;
+ }
+ case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD:
+ {
+ int ret;
+ char *name = NULL;
+ const char *provider_name, *type_name;
+
+ status = bytecode_push_get_app_context_root(bytecode);
+ if (status) {
+ ERR("Failed to get application context root from bytecode");
+ goto end;
+ }
+
+ provider_name = lttng_event_expr_app_specific_context_field_get_provider_name(
+ expr);
+ if (!provider_name) {
+ ERR("Failed to get application context provider name from event expression");
+ status = -1;
+ goto end;
+ }
+
+ type_name = lttng_event_expr_app_specific_context_field_get_type_name(
+ expr);
+ if (!type_name) {
+ ERR("Failed to get application context type name from event expression");
+ status = -1;
+ goto end;
+ }
+
+ /*
+ * Reconstitute the app context field name from its two parts.
+ */
+ ret = asprintf(&name, "%s:%s", provider_name, type_name);
+ if (ret < 0) {
+ PERROR("Failed to format application specific context: provider_name = '%s', type_name = '%s'",
+ provider_name, type_name);
+ status = -1;
+ goto end;
+ }
+
+ status = bytecode_push_get_symbol(
+ bytecode, bytecode_reloc, name);
+ free(name);
+ if (status) {
+ ERR("Failed to push 'get symbol %s:%s' in bytecode",
+ provider_name, type_name);
+ goto end;
+ }
+
+ break;
+ }
+ case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT:
+ {
+ unsigned int index;
+ const struct lttng_event_expr *parent;
+
+ parent = lttng_event_expr_array_field_element_get_parent_expr(
+ expr);
+ if (!parent) {
+ ERR("Failed to get parent expression from array event expression");
+ status = -1;
+ goto end;
+ }
+
+ status = event_expr_to_bytecode_recursive(
+ parent, bytecode, bytecode_reloc);
+ if (status) {
+ goto end;
+ }
+
+ event_expr_status =
+ lttng_event_expr_array_field_element_get_index(
+ expr, &index);
+ if (event_expr_status != LTTNG_EVENT_EXPR_STATUS_OK) {
+ ERR("Failed to get array field element index from event expression");
+ status = -1;
+ goto end;
+ }
+
+ status = bytecode_push_get_index_u64(bytecode, index);
+ if (status) {
+ ERR("Failed to push 'get index %u' in bytecode", index);
+ goto end;
+ }
+
+ break;
+ }
+ default:
+ abort();
+ }
+
+ status = 0;
+end:
+ return status;
+}
+
+LTTNG_HIDDEN
+int lttng_event_expr_to_bytecode(const struct lttng_event_expr *expr,
+ struct lttng_bytecode **bytecode_out)
+{
+ int status;
+ struct return_op ret_insn;
+ struct lttng_bytecode_alloc *bytecode = NULL;
+ struct lttng_bytecode_alloc *bytecode_reloc = NULL;
+
+ status = bytecode_init(&bytecode);
+ if (status) {
+ ERR("Failed to initialize bytecode");
+ goto end;
+ }
+
+ status = bytecode_init(&bytecode_reloc);
+ if (status) {
+ ERR("Failed to initialize relocation bytecode");
+ goto end;
+ }
+
+ status = event_expr_to_bytecode_recursive(
+ expr, &bytecode, &bytecode_reloc);
+ if (status) {
+ /* Errors already logged. */
+ goto end;
+ }
+
+ ret_insn.op = BYTECODE_OP_RETURN;
+ bytecode_push(&bytecode, &ret_insn, 1, sizeof(ret_insn));
+
+ /* Append symbol table to bytecode. */
+ bytecode->b.reloc_table_offset = bytecode_get_len(&bytecode->b);
+ status = bytecode_push(&bytecode, bytecode_reloc->b.data, 1,
+ bytecode_get_len(&bytecode_reloc->b));
+ if (status) {
+ ERR("Failed to push symbol table to bytecode");
+ goto end;
+ }
+
+ /* Copy the `lttng_bytecode` out of the `lttng_bytecode_alloc`. */
+ *bytecode_out = lttng_bytecode_copy(&bytecode->b);
+ if (!*bytecode_out) {
+ status = -1;
+ goto end;
+ }
+
+end:
+ if (bytecode) {
+ free(bytecode);
+ }
+
+ if (bytecode_reloc) {
+ free(bytecode_reloc);
+ }
+
+ return status;
+}
projects / lttng-tools.git / blobdiff