X-Git-Url: https://git.efficios.com/?a=blobdiff_plain;f=plugins%2Fctf%2Fcommon%2Fmetadata%2Fctf-meta-translate.c;h=1d318ccf0ddf85b62ef757c2e5dee7d742da6e6c;hb=83ebb7f1751a20c7ba771442487f863331c754ef;hp=e3da926f16f6a0c97a16f12a608d6ee3404b6601;hpb=1122a43a3af6fbc4419f74bbb07b5d920f42f4a0;p=babeltrace.git

diff --git a/plugins/ctf/common/metadata/ctf-meta-translate.c b/plugins/ctf/common/metadata/ctf-meta-translate.c
index e3da926f..1d318ccf 100644
--- a/plugins/ctf/common/metadata/ctf-meta-translate.c
+++ b/plugins/ctf/common/metadata/ctf-meta-translate.c
@@ -25,12 +25,18 @@
 
 #include "ctf-meta-visitors.h"
 
+struct ctx {
+	bt_trace_class *ir_tc;
+	bt_stream_class *ir_sc;
+	struct ctf_trace_class *tc;
+	struct ctf_stream_class *sc;
+	struct ctf_event_class *ec;
+	enum ctf_scope scope;
+};
+
 static inline
-bt_field_class *ctf_field_class_to_ir(bt_trace_class *ir_tc,
-		struct ctf_field_class *fc,
-		struct ctf_trace_class *tc,
-		struct ctf_stream_class *sc,
-		struct ctf_event_class *ec);
+bt_field_class *ctf_field_class_to_ir(struct ctx *ctx,
+		struct ctf_field_class *fc);
 
 static inline
 void ctf_field_class_int_set_props(struct ctf_field_class_int *fc,
@@ -43,15 +49,15 @@ void ctf_field_class_int_set_props(struct ctf_field_class_int *fc,
 }
 
 static inline
-bt_field_class *ctf_field_class_int_to_ir(bt_trace_class *ir_tc,
+bt_field_class *ctf_field_class_int_to_ir(struct ctx *ctx,
 		struct ctf_field_class_int *fc)
 {
 	bt_field_class *ir_fc;
 
 	if (fc->is_signed) {
-		ir_fc = bt_field_class_signed_integer_create(ir_tc);
+		ir_fc = bt_field_class_signed_integer_create(ctx->ir_tc);
 	} else {
-		ir_fc = bt_field_class_unsigned_integer_create(ir_tc);
+		ir_fc = bt_field_class_unsigned_integer_create(ctx->ir_tc);
 	}
 
 	BT_ASSERT(ir_fc);
@@ -60,7 +66,7 @@ bt_field_class *ctf_field_class_int_to_ir(bt_trace_class *ir_tc,
 }
 
 static inline
-bt_field_class *ctf_field_class_enum_to_ir(bt_trace_class *ir_tc,
+bt_field_class *ctf_field_class_enum_to_ir(struct ctx *ctx,
 		struct ctf_field_class_enum *fc)
 {
 	int ret;
@@ -68,9 +74,9 @@ bt_field_class *ctf_field_class_enum_to_ir(bt_trace_class *ir_tc,
 	uint64_t i;
 
 	if (fc->base.is_signed) {
-		ir_fc = bt_field_class_signed_enumeration_create(ir_tc);
+		ir_fc = bt_field_class_signed_enumeration_create(ctx->ir_tc);
 	} else {
-		ir_fc = bt_field_class_unsigned_enumeration_create(ir_tc);
+		ir_fc = bt_field_class_unsigned_enumeration_create(ctx->ir_tc);
 	}
 
 	BT_ASSERT(ir_fc);
@@ -97,12 +103,12 @@ bt_field_class *ctf_field_class_enum_to_ir(bt_trace_class *ir_tc,
 }
 
 static inline
-bt_field_class *ctf_field_class_float_to_ir(bt_trace_class *ir_tc,
+bt_field_class *ctf_field_class_float_to_ir(struct ctx *ctx,
 		struct ctf_field_class_float *fc)
 {
 	bt_field_class *ir_fc;
 
-	ir_fc = bt_field_class_real_create(ir_tc);
+	ir_fc = bt_field_class_real_create(ctx->ir_tc);
 	BT_ASSERT(ir_fc);
 
 	if (fc->base.size == 32) {
@@ -114,58 +120,61 @@ bt_field_class *ctf_field_class_float_to_ir(bt_trace_class *ir_tc,
 }
 
 static inline
-bt_field_class *ctf_field_class_string_to_ir(bt_trace_class *ir_tc,
+bt_field_class *ctf_field_class_string_to_ir(struct ctx *ctx,
 		struct ctf_field_class_string *fc)
 {
-	bt_field_class *ir_fc = bt_field_class_string_create(ir_tc);
+	bt_field_class *ir_fc = bt_field_class_string_create(ctx->ir_tc);
 
 	BT_ASSERT(ir_fc);
 	return ir_fc;
 }
 
 static inline
-bt_field_class *ctf_field_class_struct_to_ir(bt_trace_class *ir_tc,
-		struct ctf_field_class_struct *fc,
-		struct ctf_trace_class *tc,
-		struct ctf_stream_class *sc,
-		struct ctf_event_class *ec)
+void translate_struct_field_class_members(struct ctx *ctx,
+		struct ctf_field_class_struct *fc, bt_field_class *ir_fc,
+		bool with_header_prefix,
+		struct ctf_field_class_struct *context_fc)
 {
-	int ret;
-	bt_field_class *ir_fc = bt_field_class_structure_create(ir_tc);
 	uint64_t i;
-
-	BT_ASSERT(ir_fc);
+	int ret;
 
 	for (i = 0; i < fc->members->len; i++) {
 		struct ctf_named_field_class *named_fc =
 			ctf_field_class_struct_borrow_member_by_index(fc, i);
 		bt_field_class *member_ir_fc;
+		const char *name = named_fc->name->str;
 
 		if (!named_fc->fc->in_ir) {
 			continue;
 		}
 
-		member_ir_fc = ctf_field_class_to_ir(ir_tc, named_fc->fc,
-			tc, sc, ec);
+		member_ir_fc = ctf_field_class_to_ir(ctx, named_fc->fc);
 		BT_ASSERT(member_ir_fc);
-		ret = bt_field_class_structure_append_member(
-			ir_fc, named_fc->name->str, member_ir_fc);
+		ret = bt_field_class_structure_append_member(ir_fc, name,
+			member_ir_fc);
 		BT_ASSERT(ret == 0);
 		bt_field_class_put_ref(member_ir_fc);
 	}
+}
 
+static inline
+bt_field_class *ctf_field_class_struct_to_ir(struct ctx *ctx,
+		struct ctf_field_class_struct *fc)
+{
+	bt_field_class *ir_fc = bt_field_class_structure_create(ctx->ir_tc);
+
+	BT_ASSERT(ir_fc);
+	translate_struct_field_class_members(ctx, fc, ir_fc, false, NULL);
 	return ir_fc;
 }
 
 static inline
-bt_field_class *borrow_ir_ft_from_field_path(struct ctf_field_path *field_path,
-		struct ctf_trace_class *tc,
-		struct ctf_stream_class *sc,
-		struct ctf_event_class *ec)
+bt_field_class *borrow_ir_fc_from_field_path(struct ctx *ctx,
+		struct ctf_field_path *field_path)
 {
 	bt_field_class *ir_fc = NULL;
 	struct ctf_field_class *fc = ctf_field_path_borrow_field_class(
-		field_path, tc, sc, ec);
+		field_path, ctx->tc, ctx->sc, ctx->ec);
 
 	BT_ASSERT(fc);
 
@@ -177,20 +186,22 @@ bt_field_class *borrow_ir_ft_from_field_path(struct ctf_field_path *field_path,
 }
 
 static inline
-bt_field_class *ctf_field_class_variant_to_ir(bt_trace_class *ir_tc,
-		struct ctf_field_class_variant *fc,
-		struct ctf_trace_class *tc,
-		struct ctf_stream_class *sc,
-		struct ctf_event_class *ec)
+bt_field_class *ctf_field_class_variant_to_ir(struct ctx *ctx,
+		struct ctf_field_class_variant *fc)
 {
 	int ret;
-	bt_field_class *ir_fc = bt_field_class_variant_create(ir_tc);
+	bt_field_class *ir_fc = bt_field_class_variant_create(ctx->ir_tc);
 	uint64_t i;
 
 	BT_ASSERT(ir_fc);
-	ret = bt_field_class_variant_set_selector_field_class(
-		ir_fc, borrow_ir_ft_from_field_path(&fc->tag_path, tc, sc, ec));
-	BT_ASSERT(ret == 0);
+
+	if (fc->tag_path.root != CTF_SCOPE_PACKET_HEADER &&
+			fc->tag_path.root != CTF_SCOPE_EVENT_HEADER) {
+		ret = bt_field_class_variant_set_selector_field_class(
+			ir_fc, borrow_ir_fc_from_field_path(ctx,
+				&fc->tag_path));
+		BT_ASSERT(ret == 0);
+	}
 
 	for (i = 0; i < fc->options->len; i++) {
 		struct ctf_named_field_class *named_fc =
@@ -198,8 +209,7 @@ bt_field_class *ctf_field_class_variant_to_ir(bt_trace_class *ir_tc,
 		bt_field_class *option_ir_fc;
 
 		BT_ASSERT(named_fc->fc->in_ir);
-		option_ir_fc = ctf_field_class_to_ir(ir_tc, named_fc->fc,
-			tc, sc, ec);
+		option_ir_fc = ctf_field_class_to_ir(ctx, named_fc->fc);
 		BT_ASSERT(option_ir_fc);
 		ret = bt_field_class_variant_append_option(
 			ir_fc, named_fc->name->str, option_ir_fc);
@@ -211,24 +221,21 @@ bt_field_class *ctf_field_class_variant_to_ir(bt_trace_class *ir_tc,
 }
 
 static inline
-bt_field_class *ctf_field_class_array_to_ir(bt_trace_class *ir_tc,
-		struct ctf_field_class_array *fc,
-		struct ctf_trace_class *tc,
-		struct ctf_stream_class *sc,
-		struct ctf_event_class *ec)
+bt_field_class *ctf_field_class_array_to_ir(struct ctx *ctx,
+		struct ctf_field_class_array *fc)
 {
 	bt_field_class *ir_fc;
 	bt_field_class *elem_ir_fc;
 
 	if (fc->base.is_text) {
-		ir_fc = bt_field_class_string_create(ir_tc);
+		ir_fc = bt_field_class_string_create(ctx->ir_tc);
 		BT_ASSERT(ir_fc);
 		goto end;
 	}
 
-	elem_ir_fc = ctf_field_class_to_ir(ir_tc, fc->base.elem_fc, tc, sc, ec);
+	elem_ir_fc = ctf_field_class_to_ir(ctx, fc->base.elem_fc);
 	BT_ASSERT(elem_ir_fc);
-	ir_fc = bt_field_class_static_array_create(ir_tc, elem_ir_fc,
+	ir_fc = bt_field_class_static_array_create(ctx->ir_tc, elem_ir_fc,
 		fc->length);
 	BT_ASSERT(ir_fc);
 	bt_field_class_put_ref(elem_ir_fc);
@@ -238,43 +245,40 @@ end:
 }
 
 static inline
-bt_field_class *ctf_field_class_sequence_to_ir(bt_trace_class *ir_tc,
-		struct ctf_field_class_sequence *fc,
-		struct ctf_trace_class *tc,
-		struct ctf_stream_class *sc,
-		struct ctf_event_class *ec)
+bt_field_class *ctf_field_class_sequence_to_ir(struct ctx *ctx,
+		struct ctf_field_class_sequence *fc)
 {
 	int ret;
 	bt_field_class *ir_fc;
 	bt_field_class *elem_ir_fc;
 
 	if (fc->base.is_text) {
-		ir_fc = bt_field_class_string_create(ir_tc);
+		ir_fc = bt_field_class_string_create(ctx->ir_tc);
 		BT_ASSERT(ir_fc);
 		goto end;
 	}
 
-	elem_ir_fc = ctf_field_class_to_ir(ir_tc, fc->base.elem_fc, tc, sc, ec);
+	elem_ir_fc = ctf_field_class_to_ir(ctx, fc->base.elem_fc);
 	BT_ASSERT(elem_ir_fc);
-	ir_fc = bt_field_class_dynamic_array_create(ir_tc, elem_ir_fc);
+	ir_fc = bt_field_class_dynamic_array_create(ctx->ir_tc, elem_ir_fc);
 	BT_ASSERT(ir_fc);
 	bt_field_class_put_ref(elem_ir_fc);
 	BT_ASSERT(ir_fc);
-	ret = bt_field_class_dynamic_array_set_length_field_class(
-		ir_fc,
-		borrow_ir_ft_from_field_path(&fc->length_path, tc, sc, ec));
-	BT_ASSERT(ret == 0);
+
+	if (fc->length_path.root != CTF_SCOPE_PACKET_HEADER &&
+			fc->length_path.root != CTF_SCOPE_EVENT_HEADER) {
+		ret = bt_field_class_dynamic_array_set_length_field_class(
+			ir_fc, borrow_ir_fc_from_field_path(ctx, &fc->length_path));
+		BT_ASSERT(ret == 0);
+	}
 
 end:
 	return ir_fc;
 }
 
 static inline
-bt_field_class *ctf_field_class_to_ir(bt_trace_class *ir_tc,
-		struct ctf_field_class *fc,
-		struct ctf_trace_class *tc,
-		struct ctf_stream_class *sc,
-		struct ctf_event_class *ec)
+bt_field_class *ctf_field_class_to_ir(struct ctx *ctx,
+		struct ctf_field_class *fc)
 {
 	bt_field_class *ir_fc = NULL;
 
@@ -283,32 +287,28 @@ bt_field_class *ctf_field_class_to_ir(bt_trace_class *ir_tc,
 
 	switch (fc->type) {
 	case CTF_FIELD_CLASS_TYPE_INT:
-		ir_fc = ctf_field_class_int_to_ir(ir_tc, (void *) fc);
+		ir_fc = ctf_field_class_int_to_ir(ctx, (void *) fc);
 		break;
 	case CTF_FIELD_CLASS_TYPE_ENUM:
-		ir_fc = ctf_field_class_enum_to_ir(ir_tc, (void *) fc);
+		ir_fc = ctf_field_class_enum_to_ir(ctx, (void *) fc);
 		break;
 	case CTF_FIELD_CLASS_TYPE_FLOAT:
-		ir_fc = ctf_field_class_float_to_ir(ir_tc, (void *) fc);
+		ir_fc = ctf_field_class_float_to_ir(ctx, (void *) fc);
 		break;
 	case CTF_FIELD_CLASS_TYPE_STRING:
-		ir_fc = ctf_field_class_string_to_ir(ir_tc, (void *) fc);
+		ir_fc = ctf_field_class_string_to_ir(ctx, (void *) fc);
 		break;
 	case CTF_FIELD_CLASS_TYPE_STRUCT:
-		ir_fc = ctf_field_class_struct_to_ir(ir_tc, (void *) fc,
-			tc, sc, ec);
+		ir_fc = ctf_field_class_struct_to_ir(ctx, (void *) fc);
 		break;
 	case CTF_FIELD_CLASS_TYPE_ARRAY:
-		ir_fc = ctf_field_class_array_to_ir(ir_tc, (void *) fc,
-			tc, sc, ec);
+		ir_fc = ctf_field_class_array_to_ir(ctx, (void *) fc);
 		break;
 	case CTF_FIELD_CLASS_TYPE_SEQUENCE:
-		ir_fc = ctf_field_class_sequence_to_ir(ir_tc, (void *) fc,
-			tc, sc, ec);
+		ir_fc = ctf_field_class_sequence_to_ir(ctx, (void *) fc);
 		break;
 	case CTF_FIELD_CLASS_TYPE_VARIANT:
-		ir_fc = ctf_field_class_variant_to_ir(ir_tc, (void *) fc,
-			tc, sc, ec);
+		ir_fc = ctf_field_class_variant_to_ir(ctx, (void *) fc);
 		break;
 	default:
 		abort();
@@ -340,31 +340,33 @@ end:
 }
 
 static inline
-bt_field_class *scope_ctf_field_class_to_ir(bt_trace_class *ir_tc,
-		struct ctf_field_class *fc,
-		struct ctf_trace_class *tc,
-		struct ctf_stream_class *sc,
-		struct ctf_event_class *ec)
+bt_field_class *scope_ctf_field_class_to_ir(struct ctx *ctx)
 {
 	bt_field_class *ir_fc = NULL;
+	struct ctf_field_class *fc = NULL;
 
-	if (!fc) {
-		goto end;
+	switch (ctx->scope) {
+	case CTF_SCOPE_PACKET_CONTEXT:
+		fc = ctx->sc->packet_context_fc;
+		break;
+	case CTF_SCOPE_EVENT_COMMON_CONTEXT:
+		fc = ctx->sc->event_common_context_fc;
+		break;
+	case CTF_SCOPE_EVENT_SPECIFIC_CONTEXT:
+		fc = ctx->ec->spec_context_fc;
+		break;
+	case CTF_SCOPE_EVENT_PAYLOAD:
+		fc = ctx->ec->payload_fc;
+		break;
+	default:
+		abort();
 	}
 
-	BT_ASSERT(fc->type == CTF_FIELD_CLASS_TYPE_STRUCT);
-
-	if (!ctf_field_class_struct_has_immediate_member_in_ir((void *) fc)) {
-		/*
-		 * Nothing for IR in this scope: typical for packet
-		 * header, packet context, and event header.
-		 */
-		goto end;
+	if (fc && ctf_field_class_struct_has_immediate_member_in_ir(
+			(void *) fc)) {
+		ir_fc = ctf_field_class_to_ir(ctx, fc);
 	}
 
-	ir_fc = ctf_field_class_to_ir(ir_tc, fc, tc, sc, ec);
-
-end:
 	return ir_fc;
 }
 
@@ -396,177 +398,153 @@ end:
 }
 
 static inline
-bt_event_class *ctf_event_class_to_ir(struct ctf_event_class *ec,
-		bt_stream_class *ir_sc, struct ctf_trace_class *tc,
-		struct ctf_stream_class *sc)
+void ctf_event_class_to_ir(struct ctx *ctx)
 {
 	int ret;
 	bt_event_class *ir_ec = NULL;
-	bt_trace_class *ir_tc = bt_stream_class_borrow_trace_class(ir_sc);
+	bt_field_class *ir_fc;
 
-	if (ec->is_translated) {
+	BT_ASSERT(ctx->ec);
+
+	if (ctx->ec->is_translated) {
 		ir_ec = bt_stream_class_borrow_event_class_by_id(
-			ir_sc, ec->id);
+			ctx->ir_sc, ctx->ec->id);
 		BT_ASSERT(ir_ec);
 		goto end;
 	}
 
-	ir_ec = bt_event_class_create_with_id(ir_sc, ec->id);
+	ir_ec = bt_event_class_create_with_id(ctx->ir_sc, ctx->ec->id);
 	BT_ASSERT(ir_ec);
 	bt_event_class_put_ref(ir_ec);
-
-	if (ec->spec_context_fc) {
-		bt_field_class *ir_fc = scope_ctf_field_class_to_ir(ir_tc,
-			ec->spec_context_fc, tc, sc, ec);
-
-		if (ir_fc) {
-			ret = bt_event_class_set_specific_context_field_class(
-				ir_ec, ir_fc);
-			BT_ASSERT(ret == 0);
-			bt_field_class_put_ref(ir_fc);
-		}
+	ctx->scope = CTF_SCOPE_EVENT_SPECIFIC_CONTEXT;
+	ir_fc = scope_ctf_field_class_to_ir(ctx);
+	if (ir_fc) {
+		ret = bt_event_class_set_specific_context_field_class(
+			ir_ec, ir_fc);
+		BT_ASSERT(ret == 0);
+		bt_field_class_put_ref(ir_fc);
 	}
 
-	if (ec->payload_fc) {
-		bt_field_class *ir_fc = scope_ctf_field_class_to_ir(ir_tc,
-			ec->payload_fc, tc, sc, ec);
-
-		if (ir_fc) {
-			ret = bt_event_class_set_payload_field_class(ir_ec,
-				ir_fc);
-			BT_ASSERT(ret == 0);
-			bt_field_class_put_ref(ir_fc);
-		}
+	ctx->scope = CTF_SCOPE_EVENT_PAYLOAD;
+	ir_fc = scope_ctf_field_class_to_ir(ctx);
+	if (ir_fc) {
+		ret = bt_event_class_set_payload_field_class(ir_ec,
+			ir_fc);
+		BT_ASSERT(ret == 0);
+		bt_field_class_put_ref(ir_fc);
 	}
 
-	if (ec->name->len > 0) {
-		ret = bt_event_class_set_name(ir_ec, ec->name->str);
+	if (ctx->ec->name->len > 0) {
+		ret = bt_event_class_set_name(ir_ec, ctx->ec->name->str);
 		BT_ASSERT(ret == 0);
 	}
 
-	if (ec->emf_uri->len > 0) {
-		ret = bt_event_class_set_emf_uri(ir_ec, ec->emf_uri->str);
+	if (ctx->ec->emf_uri->len > 0) {
+		ret = bt_event_class_set_emf_uri(ir_ec, ctx->ec->emf_uri->str);
 		BT_ASSERT(ret == 0);
 	}
 
-	if (ec->log_level != -1) {
-		bt_event_class_set_log_level(ir_ec, ec->log_level);
+	if (ctx->ec->log_level != -1) {
+		bt_event_class_set_log_level(ir_ec, ctx->ec->log_level);
 	}
 
-	ec->is_translated = true;
-	ec->ir_ec = ir_ec;
+	ctx->ec->is_translated = true;
+	ctx->ec->ir_ec = ir_ec;
 
 end:
-	return ir_ec;
+	return;
 }
 
 
 static inline
-bt_stream_class *ctf_stream_class_to_ir(struct ctf_stream_class *sc,
-		bt_trace_class *ir_tc, struct ctf_trace_class *tc)
+void ctf_stream_class_to_ir(struct ctx *ctx)
 {
 	int ret;
-	bt_stream_class *ir_sc = NULL;
 	struct ctf_field_class_int *int_fc;
+	bt_field_class *ir_fc;
 
-	if (sc->is_translated) {
-		ir_sc = bt_trace_class_borrow_stream_class_by_id(ir_tc, sc->id);
-		BT_ASSERT(ir_sc);
-		goto end;
-	}
-
-	ir_sc = bt_stream_class_create_with_id(ir_tc, sc->id);
-	BT_ASSERT(ir_sc);
-	bt_stream_class_put_ref(ir_sc);
-
-	if (sc->packet_context_fc) {
-		bt_field_class *ir_fc = scope_ctf_field_class_to_ir(ir_tc,
-			sc->packet_context_fc, tc, sc, NULL);
+	BT_ASSERT(ctx->sc);
 
-		if (ir_fc) {
-			ret = bt_stream_class_set_packet_context_field_class(
-				ir_sc, ir_fc);
-			BT_ASSERT(ret == 0);
-			bt_field_class_put_ref(ir_fc);
-		}
+	if (ctx->sc->is_translated) {
+		ctx->ir_sc = bt_trace_class_borrow_stream_class_by_id(
+			ctx->ir_tc, ctx->sc->id);
+		BT_ASSERT(ctx->ir_sc);
+		goto end;
 	}
 
-	if (sc->event_header_fc) {
-		bt_field_class *ir_fc = scope_ctf_field_class_to_ir(ir_tc,
-			sc->event_header_fc, tc, sc, NULL);
-
-		if (ir_fc) {
-			ret = bt_stream_class_set_event_header_field_class(
-				ir_sc, ir_fc);
-			BT_ASSERT(ret == 0);
-			bt_field_class_put_ref(ir_fc);
-		}
+	ctx->ir_sc = bt_stream_class_create_with_id(ctx->ir_tc, ctx->sc->id);
+	BT_ASSERT(ctx->ir_sc);
+	bt_stream_class_put_ref(ctx->ir_sc);
+	ctx->scope = CTF_SCOPE_PACKET_CONTEXT;
+	ir_fc = scope_ctf_field_class_to_ir(ctx);
+	if (ir_fc) {
+		ret = bt_stream_class_set_packet_context_field_class(
+			ctx->ir_sc, ir_fc);
+		BT_ASSERT(ret == 0);
+		bt_field_class_put_ref(ir_fc);
 	}
 
-	if (sc->event_common_context_fc) {
-		bt_field_class *ir_fc = scope_ctf_field_class_to_ir(ir_tc,
-			sc->event_common_context_fc, tc, sc, NULL);
-
-		if (ir_fc) {
-			ret = bt_stream_class_set_event_common_context_field_class(
-				ir_sc, ir_fc);
-			BT_ASSERT(ret == 0);
-			bt_field_class_put_ref(ir_fc);
-		}
+	ctx->scope = CTF_SCOPE_EVENT_COMMON_CONTEXT;
+	ir_fc = scope_ctf_field_class_to_ir(ctx);
+	if (ir_fc) {
+		ret = bt_stream_class_set_event_common_context_field_class(
+			ctx->ir_sc, ir_fc);
+		BT_ASSERT(ret == 0);
+		bt_field_class_put_ref(ir_fc);
 	}
 
-	bt_stream_class_set_assigns_automatic_event_class_id(ir_sc,
+	bt_stream_class_set_assigns_automatic_event_class_id(ctx->ir_sc,
 		BT_FALSE);
-	bt_stream_class_set_assigns_automatic_stream_id(ir_sc, BT_FALSE);
+	bt_stream_class_set_assigns_automatic_stream_id(ctx->ir_sc, BT_FALSE);
 
-	if (sc->default_clock_class) {
-		BT_ASSERT(sc->default_clock_class->ir_cc);
-		ret = bt_stream_class_set_default_clock_class(ir_sc,
-			sc->default_clock_class->ir_cc);
+	if (ctx->sc->default_clock_class) {
+		BT_ASSERT(ctx->sc->default_clock_class->ir_cc);
+		ret = bt_stream_class_set_default_clock_class(ctx->ir_sc,
+			ctx->sc->default_clock_class->ir_cc);
 		BT_ASSERT(ret == 0);
 	}
 
-	int_fc = borrow_named_int_field_class((void *) sc->packet_context_fc,
+	int_fc = borrow_named_int_field_class((void *) ctx->sc->packet_context_fc,
 		"events_discarded");
 	if (int_fc) {
 		if (int_fc->meaning == CTF_FIELD_CLASS_MEANING_DISC_EV_REC_COUNTER_SNAPSHOT) {
 			bt_stream_class_set_packets_have_discarded_event_counter_snapshot(
-				ir_sc, BT_TRUE);
+				ctx->ir_sc, BT_TRUE);
 		}
 	}
 
-	int_fc = borrow_named_int_field_class((void *) sc->packet_context_fc,
+	int_fc = borrow_named_int_field_class((void *) ctx->sc->packet_context_fc,
 		"packet_seq_num");
 	if (int_fc) {
 		if (int_fc->meaning == CTF_FIELD_CLASS_MEANING_PACKET_COUNTER_SNAPSHOT) {
 			bt_stream_class_set_packets_have_packet_counter_snapshot(
-				ir_sc, BT_TRUE);
+				ctx->ir_sc, BT_TRUE);
 		}
 	}
 
-	int_fc = borrow_named_int_field_class((void *) sc->packet_context_fc,
+	int_fc = borrow_named_int_field_class((void *) ctx->sc->packet_context_fc,
 		"timestamp_begin");
 	if (int_fc) {
 		if (int_fc->meaning == CTF_FIELD_CLASS_MEANING_PACKET_BEGINNING_TIME) {
 			bt_stream_class_set_packets_have_default_beginning_clock_snapshot(
-				ir_sc, BT_TRUE);
+				ctx->ir_sc, BT_TRUE);
 		}
 	}
 
-	int_fc = borrow_named_int_field_class((void *) sc->packet_context_fc,
+	int_fc = borrow_named_int_field_class((void *) ctx->sc->packet_context_fc,
 		"timestamp_end");
 	if (int_fc) {
 		if (int_fc->meaning == CTF_FIELD_CLASS_MEANING_PACKET_END_TIME) {
 			bt_stream_class_set_packets_have_default_end_clock_snapshot(
-				ir_sc, BT_TRUE);
+				ctx->ir_sc, BT_TRUE);
 		}
 	}
 
-	sc->is_translated = true;
-	sc->ir_sc = ir_sc;
+	ctx->sc->is_translated = true;
+	ctx->sc->ir_sc = ctx->ir_sc;
 
 end:
-	return ir_sc;
+	return;
 }
 
 static inline
@@ -596,44 +574,35 @@ void ctf_clock_class_to_ir(bt_clock_class *ir_cc, struct ctf_clock_class *cc)
 }
 
 static inline
-int ctf_trace_class_to_ir(bt_trace_class *ir_tc, struct ctf_trace_class *tc)
+int ctf_trace_class_to_ir(struct ctx *ctx)
 {
 	int ret = 0;
 	uint64_t i;
 
-	if (tc->is_translated) {
-		goto end;
-	}
-
-	if (tc->packet_header_fc) {
-		bt_field_class *ir_fc = scope_ctf_field_class_to_ir(ir_tc,
-			tc->packet_header_fc, tc, NULL, NULL);
+	BT_ASSERT(ctx->tc);
+	BT_ASSERT(ctx->ir_tc);
 
-		if (ir_fc) {
-			ret = bt_trace_class_set_packet_header_field_class(
-				ir_tc, ir_fc);
-			BT_ASSERT(ret == 0);
-			bt_field_class_put_ref(ir_fc);
-		}
+	if (ctx->tc->is_translated) {
+		goto end;
 	}
 
-	if (tc->is_uuid_set) {
-		bt_trace_class_set_uuid(ir_tc, tc->uuid);
+	if (ctx->tc->is_uuid_set) {
+		bt_trace_class_set_uuid(ctx->ir_tc, ctx->tc->uuid);
 	}
 
-	for (i = 0; i < tc->env_entries->len; i++) {
+	for (i = 0; i < ctx->tc->env_entries->len; i++) {
 		struct ctf_trace_class_env_entry *env_entry =
-			ctf_trace_class_borrow_env_entry_by_index(tc, i);
+			ctf_trace_class_borrow_env_entry_by_index(ctx->tc, i);
 
 		switch (env_entry->type) {
 		case CTF_TRACE_CLASS_ENV_ENTRY_TYPE_INT:
 			ret = bt_trace_class_set_environment_entry_integer(
-				ir_tc, env_entry->name->str,
+				ctx->ir_tc, env_entry->name->str,
 				env_entry->value.i);
 			break;
 		case CTF_TRACE_CLASS_ENV_ENTRY_TYPE_STR:
 			ret = bt_trace_class_set_environment_entry_string(
-				ir_tc, env_entry->name->str,
+				ctx->ir_tc, env_entry->name->str,
 				env_entry->value.str->str);
 			break;
 		default:
@@ -645,17 +614,17 @@ int ctf_trace_class_to_ir(bt_trace_class *ir_tc, struct ctf_trace_class *tc)
 		}
 	}
 
-	for (i = 0; i < tc->clock_classes->len; i++) {
-		struct ctf_clock_class *cc = tc->clock_classes->pdata[i];
+	for (i = 0; i < ctx->tc->clock_classes->len; i++) {
+		struct ctf_clock_class *cc = ctx->tc->clock_classes->pdata[i];
 
-		cc->ir_cc = bt_clock_class_create(ir_tc);
+		cc->ir_cc = bt_clock_class_create(ctx->ir_tc);
 		ctf_clock_class_to_ir(cc->ir_cc, cc);
 	}
 
-	bt_trace_class_set_assigns_automatic_stream_class_id(ir_tc,
+	bt_trace_class_set_assigns_automatic_stream_class_id(ctx->ir_tc,
 		BT_FALSE);
-	tc->is_translated = true;
-	tc->ir_tc = ir_tc;
+	ctx->tc->is_translated = true;
+	ctx->tc->ir_tc = ctx->ir_tc;
 
 end:
 	return ret;
@@ -667,33 +636,29 @@ int ctf_trace_class_translate(bt_trace_class *ir_tc,
 {
 	int ret = 0;
 	uint64_t i;
+	struct ctx ctx = { 0 };
 
-	ret = ctf_trace_class_to_ir(ir_tc, tc);
+	ctx.tc = tc;
+	ctx.ir_tc = ir_tc;
+	ret = ctf_trace_class_to_ir(&ctx);
 	if (ret) {
 		goto end;
 	}
 
 	for (i = 0; i < tc->stream_classes->len; i++) {
 		uint64_t j;
-		struct ctf_stream_class *sc = tc->stream_classes->pdata[i];
-		bt_stream_class *ir_sc;
+		ctx.sc = tc->stream_classes->pdata[i];
 
-		ir_sc = ctf_stream_class_to_ir(sc, ir_tc, tc);
-		if (!ir_sc) {
-			ret = -1;
-			goto end;
-		}
+		ctf_stream_class_to_ir(&ctx);
 
-		for (j = 0; j < sc->event_classes->len; j++) {
-			struct ctf_event_class *ec = sc->event_classes->pdata[j];
-			bt_event_class *ir_ec;
+		for (j = 0; j < ctx.sc->event_classes->len; j++) {
+			ctx.ec = ctx.sc->event_classes->pdata[j];
 
-			ir_ec = ctf_event_class_to_ir(ec, ir_sc, tc, sc);
-			if (!ir_ec) {
-				ret = -1;
-				goto end;
-			}
+			ctf_event_class_to_ir(&ctx);
+			ctx.ec = NULL;
 		}
+
+		ctx.sc = NULL;
 	}
 
 end: