X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;ds=sidebyside;f=formats%2Fctf%2Fmetadata%2Fctf-parser.y;h=4ae9b4ee64fbc16a4dc4e5742385cfba8c9deb01;hb=02b234c461611f6f479c2dc3697a1b42b03cf050;hp=f5cb22ad358eee395ecfad052cf8cfad79524a44;hpb=8b9d5b5e700bdf66edf4c0fa035fdf10cb3b36f3;p=babeltrace.git

diff --git a/formats/ctf/metadata/ctf-parser.y b/formats/ctf/metadata/ctf-parser.y
index f5cb22ad..4ae9b4ee 100644
--- a/formats/ctf/metadata/ctf-parser.y
+++ b/formats/ctf/metadata/ctf-parser.y
@@ -1,8 +1,20 @@
 %{
 /*
- * ctf.y
+ * ctf-parser.y
  *
  * Common Trace Format Metadata Grammar.
+ *
+ * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
  */
 
 #include <stdio.h>
@@ -12,32 +24,26 @@
 #include <assert.h>
 #include <helpers/list.h>
 #include <glib.h>
+#include <errno.h>
+#include "ctf-scanner.h"
 #include "ctf-parser.h"
 #include "ctf-ast.h"
 
-#define printf_dbg(fmt, args...)	fprintf(stderr, "%s: " fmt, __func__, args)
-#define printf_dbg_noarg(fmt)	fprintf(stderr, "%s: " fmt, __func__)
+#define printf_dbg(fmt, args...)	fprintf(stderr, "%s: " fmt, __func__, ## args)
 
-int yyparse(void);
-int yylex(void);
+int yyparse(struct ctf_scanner *scanner);
+int yylex(union YYSTYPE *yyval, struct ctf_scanner *scanner);
+int yylex_init_extra(struct ctf_scanner *scanner, yyscan_t * ptr_yy_globals);
+int yylex_destroy(yyscan_t yyscanner) ;
+void yyset_in(FILE * in_str, yyscan_t scanner);
 
-static CDS_LIST_HEAD(allocated_strings);
 int yydebug;
 
-struct scope;
-struct scope {
-	struct scope *parent;
-	GHashTable *types;
-};
-
 struct gc_string {
 	struct cds_list_head gc;
 	char s[];
 };
 
-struct scope root_scope;
-struct scope *cs = &root_scope;	/* current scope */
-
 char *strredup(char **dest, const char *src)
 {
 	size_t len = strlen(src) + 1;
@@ -49,55 +55,56 @@ char *strredup(char **dest, const char *src)
 	return *dest;
 }
 
-static struct gc_string *gc_string_alloc(size_t len)
+static struct gc_string *gc_string_alloc(struct ctf_scanner *scanner, size_t len)
 {
 	struct gc_string *gstr;
 
 	gstr = malloc(sizeof(*gstr) + len);
-	cds_list_add(&gstr->gc, &allocated_strings);
+	cds_list_add(&gstr->gc, &scanner->allocated_strings);
 	return gstr;
 }
 
-void setstring(const char *src)
+void setstring(struct ctf_scanner *scanner, YYSTYPE *lvalp, const char *src)
 {
-	yylval.gs = gc_string_alloc(strlen(src) + 1);
-	strcpy(yylval.gs->s, src);
+	lvalp->gs = gc_string_alloc(scanner, strlen(src) + 1);
+	strcpy(lvalp->gs->s, src);
 }
 
-static void init_scope(struct scope *scope, struct scope *parent)
+static void init_scope(struct ctf_scanner_scope *scope,
+		       struct ctf_scanner_scope *parent)
 {
 	scope->parent = parent;
 	scope->types = g_hash_table_new_full(g_str_hash, g_str_equal,
 					     (GDestroyNotify) free, NULL);
 }
 
-static void finalize_scope(struct scope *scope)
+static void finalize_scope(struct ctf_scanner_scope *scope)
 {
 	g_hash_table_destroy(scope->types);
 }
 
-static void push_scope(void)
+static void push_scope(struct ctf_scanner *scanner)
 {
-	struct scope *ns;
+	struct ctf_scanner_scope *ns;
 
-	printf_dbg_noarg("push scope\n");
-	ns = malloc(sizeof(struct scope));
-	init_scope(ns, cs);
-	cs = ns;
+	printf_dbg("push scope\n");
+	ns = malloc(sizeof(struct ctf_scanner_scope));
+	init_scope(ns, scanner->cs);
+	scanner->cs = ns;
 }
 
-static void pop_scope(void)
+static void pop_scope(struct ctf_scanner *scanner)
 {
-	struct scope *os;
+	struct ctf_scanner_scope *os;
 
-	printf_dbg_noarg("pop scope\n");
-	os = cs;
-	cs = os->parent;
+	printf_dbg("pop scope\n");
+	os = scanner->cs;
+	scanner->cs = os->parent;
 	finalize_scope(os);
 	free(os);
 }
 
-int lookup_type(struct scope *s, const char *id)
+static int lookup_type(struct ctf_scanner_scope *s, const char *id)
 {
 	int ret;
 
@@ -106,12 +113,12 @@ int lookup_type(struct scope *s, const char *id)
 	return ret;
 }
 
-int is_type(const char *id)
+int is_type(struct ctf_scanner *scanner, const char *id)
 {
-	struct scope *it;
+	struct ctf_scanner_scope *it;
 	int ret = 0;
 
-	for (it = cs; it != NULL; it = it->parent) {
+	for (it = scanner->cs; it != NULL; it = it->parent) {
 		if (lookup_type(it, id)) {
 			ret = 1;
 			break;
@@ -121,18 +128,524 @@ int is_type(const char *id)
 	return ret;
 }
 
-static void add_type(const char *id)
+static void add_type(struct ctf_scanner *scanner, const char *id)
 {
 	char *type_id = NULL;
 
 	printf_dbg("add type %s\n", id);
-	if (lookup_type(cs, id))
+	if (lookup_type(scanner->cs, id))
 		return;
 	strredup(&type_id, id);
-	g_hash_table_insert(cs->types, type_id, type_id);
+	g_hash_table_insert(scanner->cs->types, type_id, type_id);
+}
+
+static struct ctf_node *make_node(struct ctf_scanner *scanner,
+				  enum node_type type)
+{
+	struct ctf_ast *ast = ctf_scanner_get_ast(scanner);
+	struct ctf_node *node;
+
+	node = malloc(sizeof(*node));
+	if (!node)
+		return NULL;
+	memset(node, 0, sizeof(*node));
+	node->type = type;
+	CDS_INIT_LIST_HEAD(&node->siblings);
+	cds_list_add(&node->gc, &ast->allocated_nodes);
+
+	switch (type) {
+	case NODE_ROOT:
+		fprintf(stderr, "[error] %s: trying to create root node\n", __func__);
+		break;
+
+	case NODE_EVENT:
+		CDS_INIT_LIST_HEAD(&node->u.event._typedef);
+		CDS_INIT_LIST_HEAD(&node->u.event.typealias);
+		CDS_INIT_LIST_HEAD(&node->u.event.ctf_expression);
+		CDS_INIT_LIST_HEAD(&node->u.event.declaration_specifier);
+		break;
+	case NODE_STREAM:
+		CDS_INIT_LIST_HEAD(&node->u.stream._typedef);
+		CDS_INIT_LIST_HEAD(&node->u.stream.typealias);
+		CDS_INIT_LIST_HEAD(&node->u.stream.ctf_expression);
+		CDS_INIT_LIST_HEAD(&node->u.stream.declaration_specifier);
+		break;
+	case NODE_TRACE:
+		CDS_INIT_LIST_HEAD(&node->u.trace._typedef);
+		CDS_INIT_LIST_HEAD(&node->u.trace.typealias);
+		CDS_INIT_LIST_HEAD(&node->u.trace.ctf_expression);
+		CDS_INIT_LIST_HEAD(&node->u.trace.declaration_specifier);
+		break;
+
+	case NODE_CTF_EXPRESSION:
+		break;
+
+	case NODE_TYPEDEF:
+		CDS_INIT_LIST_HEAD(&node->u._typedef.type_declarators);
+		break;
+	case NODE_TYPEALIAS_TARGET:
+		CDS_INIT_LIST_HEAD(&node->u.typealias_target.type_declarators);
+		break;
+	case NODE_TYPEALIAS_ALIAS:
+		CDS_INIT_LIST_HEAD(&node->u.typealias_alias.type_declarators);
+		break;
+	case NODE_TYPEALIAS:
+		break;
+
+	case NODE_TYPE_SPECIFIER:
+		break;
+	case NODE_DECLARATION_SPECIFIER:
+		CDS_INIT_LIST_HEAD(&node->u.declaration_specifier.type_specifiers);
+		break;
+	case NODE_POINTER:
+		break;
+	case NODE_TYPE_DECLARATOR:
+		CDS_INIT_LIST_HEAD(&node->u.type_declarator.pointers);
+		break;
+
+	case NODE_FLOATING_POINT:
+		CDS_INIT_LIST_HEAD(&node->u.floating_point.expressions);
+		break;
+	case NODE_INTEGER:
+		CDS_INIT_LIST_HEAD(&node->u.integer.expressions);
+		break;
+	case NODE_STRING:
+		CDS_INIT_LIST_HEAD(&node->u.string.expressions);
+		break;
+	case NODE_ENUMERATOR:
+		break;
+	case NODE_ENUM:
+		CDS_INIT_LIST_HEAD(&node->u._enum.enumerator_list);
+		break;
+	case NODE_STRUCT_OR_VARIANT_DECLARATION:
+		CDS_INIT_LIST_HEAD(&node->u.struct_or_variant_declaration.type_declarators);
+		break;
+	case NODE_VARIANT:
+		CDS_INIT_LIST_HEAD(&node->u.variant._typedef);
+		CDS_INIT_LIST_HEAD(&node->u.variant.typealias);
+		CDS_INIT_LIST_HEAD(&node->u.variant.declaration_list);
+		break;
+	case NODE_STRUCT:
+		CDS_INIT_LIST_HEAD(&node->u._struct._typedef);
+		CDS_INIT_LIST_HEAD(&node->u._struct.typealias);
+		CDS_INIT_LIST_HEAD(&node->u._struct.declaration_list);
+		break;
+
+	case NODE_UNKNOWN:
+	default:
+		fprintf(stderr, "[error] %s: unknown node type %d\n", __func__,
+			(int) type);
+		break;
+	}
+
+	return node;
+}
+
+static int reparent_ctf_expression(struct ctf_node *node,
+				   struct ctf_node *parent)
+{
+	switch (parent->type) {
+	case NODE_EVENT:
+		cds_list_add(&node->siblings, &parent->u.event.ctf_expression);
+		break;
+	case NODE_STREAM:
+		cds_list_add(&node->siblings, &parent->u.stream.ctf_expression);
+		break;
+	case NODE_TRACE:
+		cds_list_add(&node->siblings, &parent->u.trace.ctf_expression);
+		break;
+	case NODE_FLOATING_POINT:
+		cds_list_add(&node->siblings, &parent->u.floating_point.expressions);
+		break;
+	case NODE_INTEGER:
+		cds_list_add(&node->siblings, &parent->u.integer.expressions);
+		break;
+	case NODE_STRING:
+		cds_list_add(&node->siblings, &parent->u.string.expressions);
+		break;
+
+	case NODE_ROOT:
+	case NODE_CTF_EXPRESSION:
+	case NODE_TYPEDEF:
+	case NODE_TYPEALIAS_TARGET:
+	case NODE_TYPEALIAS_ALIAS:
+	case NODE_TYPEALIAS:
+	case NODE_TYPE_SPECIFIER:
+	case NODE_DECLARATION_SPECIFIER:
+	case NODE_POINTER:
+	case NODE_TYPE_DECLARATOR:
+	case NODE_ENUMERATOR:
+	case NODE_ENUM:
+	case NODE_STRUCT_OR_VARIANT_DECLARATION:
+	case NODE_VARIANT:
+	case NODE_STRUCT:
+		return -EPERM;
+
+	case NODE_UNKNOWN:
+	default:
+		fprintf(stderr, "[error] %s: unknown node type %d\n", __func__,
+			(int) parent->type);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int reparent_typedef(struct ctf_node *node, struct ctf_node *parent)
+{
+	switch (parent->type) {
+	case NODE_ROOT:
+		cds_list_add(&node->siblings, &parent->u.root._typedef);
+		break;
+	case NODE_EVENT:
+		cds_list_add(&node->siblings, &parent->u.event._typedef);
+		break;
+	case NODE_STREAM:
+		cds_list_add(&node->siblings, &parent->u.stream._typedef);
+		break;
+	case NODE_TRACE:
+		cds_list_add(&node->siblings, &parent->u.trace._typedef);
+		break;
+	case NODE_VARIANT:
+		cds_list_add(&node->siblings, &parent->u.variant._typedef);
+		break;
+	case NODE_STRUCT:
+		cds_list_add(&node->siblings, &parent->u._struct._typedef);
+		break;
+
+	case NODE_FLOATING_POINT:
+	case NODE_INTEGER:
+	case NODE_STRING:
+	case NODE_CTF_EXPRESSION:
+	case NODE_TYPEDEF:
+	case NODE_TYPEALIAS_TARGET:
+	case NODE_TYPEALIAS_ALIAS:
+	case NODE_TYPEALIAS:
+	case NODE_TYPE_SPECIFIER:
+	case NODE_DECLARATION_SPECIFIER:
+	case NODE_POINTER:
+	case NODE_TYPE_DECLARATOR:
+	case NODE_ENUMERATOR:
+	case NODE_ENUM:
+	case NODE_STRUCT_OR_VARIANT_DECLARATION:
+		return -EPERM;
+
+	case NODE_UNKNOWN:
+	default:
+		fprintf(stderr, "[error] %s: unknown node type %d\n", __func__,
+			(int) parent->type);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int reparent_typealias(struct ctf_node *node, struct ctf_node *parent)
+{
+	switch (parent->type) {
+	case NODE_ROOT:
+		cds_list_add(&node->siblings, &parent->u.root.typealias);
+		break;
+	case NODE_EVENT:
+		cds_list_add(&node->siblings, &parent->u.event.typealias);
+		break;
+	case NODE_STREAM:
+		cds_list_add(&node->siblings, &parent->u.stream.typealias);
+		break;
+	case NODE_TRACE:
+		cds_list_add(&node->siblings, &parent->u.trace.typealias);
+		break;
+	case NODE_VARIANT:
+		cds_list_add(&node->siblings, &parent->u.variant.typealias);
+		break;
+	case NODE_STRUCT:
+		cds_list_add(&node->siblings, &parent->u._struct.typealias);
+		break;
+
+	case NODE_FLOATING_POINT:
+	case NODE_INTEGER:
+	case NODE_STRING:
+	case NODE_CTF_EXPRESSION:
+	case NODE_TYPEDEF:
+	case NODE_TYPEALIAS_TARGET:
+	case NODE_TYPEALIAS_ALIAS:
+	case NODE_TYPEALIAS:
+	case NODE_TYPE_SPECIFIER:
+	case NODE_DECLARATION_SPECIFIER:
+	case NODE_POINTER:
+	case NODE_TYPE_DECLARATOR:
+	case NODE_ENUMERATOR:
+	case NODE_ENUM:
+	case NODE_STRUCT_OR_VARIANT_DECLARATION:
+		return -EPERM;
+
+	case NODE_UNKNOWN:
+	default:
+		fprintf(stderr, "[error] %s: unknown node type %d\n", __func__,
+			(int) parent->type);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int reparent_declaration_specifier(struct ctf_node *node,
+					  struct ctf_node *parent)
+{
+	switch (parent->type) {
+	case NODE_ROOT:
+		cds_list_add(&node->siblings, &parent->u.root.declaration_specifier);
+		break;
+	case NODE_EVENT:
+		cds_list_add(&node->siblings, &parent->u.event.declaration_specifier);
+		break;
+	case NODE_STREAM:
+		cds_list_add(&node->siblings, &parent->u.stream.declaration_specifier);
+		break;
+	case NODE_TRACE:
+		cds_list_add(&node->siblings, &parent->u.trace.declaration_specifier);
+		break;
+	case NODE_VARIANT:
+		cds_list_add(&node->siblings, &parent->u.variant.declaration_list);
+		break;
+	case NODE_STRUCT:
+		cds_list_add(&node->siblings, &parent->u._struct.declaration_list);
+		break;
+	case NODE_TYPEDEF:
+		parent->u._typedef.declaration_specifier = node;
+		break;
+	case NODE_TYPEALIAS_TARGET:
+		parent->u.typealias_target.declaration_specifier = node;
+		break;
+	case NODE_TYPEALIAS_ALIAS:
+		parent->u.typealias_alias.declaration_specifier = node;
+		break;
+	case NODE_TYPE_DECLARATOR:
+		parent->u.type_declarator.type = TYPEDEC_NESTED;
+		parent->u.type_declarator.u.nested.length.type = TYPEDEC_TYPE_TYPE;
+		parent->u.type_declarator.u.nested.length.u.declaration_specifier = node;
+		break;
+	case NODE_ENUM:
+		parent->u._enum.container_type.type = ENUM_TYPE_TYPE;
+		parent->u._enum.container_type.u.declaration_specifier = node;
+		break;
+	case NODE_STRUCT_OR_VARIANT_DECLARATION:
+		parent->u.struct_or_variant_declaration.declaration_specifier = node;
+		break;
+	case NODE_TYPEALIAS:
+	case NODE_FLOATING_POINT:
+	case NODE_INTEGER:
+	case NODE_STRING:
+	case NODE_CTF_EXPRESSION:
+	case NODE_TYPE_SPECIFIER:
+	case NODE_DECLARATION_SPECIFIER:
+	case NODE_POINTER:
+	case NODE_ENUMERATOR:
+		return -EPERM;
+
+	case NODE_UNKNOWN:
+	default:
+		fprintf(stderr, "[error] %s: unknown node type %d\n", __func__,
+			(int) parent->type);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int reparent_type_declarator(struct ctf_node *node,
+				    struct ctf_node *parent)
+{
+	switch (parent->type) {
+	case NODE_TYPE_DECLARATOR:
+		parent->u.type_declarator.type = TYPEDEC_NESTED;
+		parent->u.type_declarator.u.nested.type_declarator = node;
+		break;
+	case NODE_STRUCT_OR_VARIANT_DECLARATION:
+		cds_list_add(&node->siblings, &parent->u.struct_or_variant_declaration.type_declarators);
+		break;
+	case NODE_TYPEDEF:
+		cds_list_add(&node->siblings, &parent->u._typedef.type_declarators);
+		break;
+	case NODE_TYPEALIAS_TARGET:
+		cds_list_add(&node->siblings, &parent->u.typealias_target.type_declarators);
+		break;
+	case NODE_TYPEALIAS_ALIAS:
+		cds_list_add(&node->siblings, &parent->u.typealias_alias.type_declarators);
+		break;
+
+	case NODE_ROOT:
+	case NODE_EVENT:
+	case NODE_STREAM:
+	case NODE_TRACE:
+	case NODE_VARIANT:
+	case NODE_STRUCT:
+	case NODE_TYPEALIAS:
+	case NODE_ENUM:
+	case NODE_FLOATING_POINT:
+	case NODE_INTEGER:
+	case NODE_STRING:
+	case NODE_CTF_EXPRESSION:
+	case NODE_TYPE_SPECIFIER:
+	case NODE_DECLARATION_SPECIFIER:
+	case NODE_POINTER:
+	case NODE_ENUMERATOR:
+		return -EPERM;
+
+	case NODE_UNKNOWN:
+	default:
+		fprintf(stderr, "[error] %s: unknown node type %d\n", __func__,
+			(int) parent->type);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/*
+ * reparent node
+ *
+ * Relink node to new parent. Returns 0 on success, -EPERM if it is not
+ * permitted to create the link declared by the input, -ENOENT if node or parent
+ * is NULL, -EINVAL if there is an internal structure problem.
+ */
+static int reparent_node(struct ctf_node *node,
+			 struct ctf_node *parent)
+{
+	if (!node || !parent)
+		return -ENOENT;
+
+	/* Unlink from old parent */
+	cds_list_del(&node->siblings);
+
+	/* Link to new parent */
+	node->parent = parent;
+
+	switch (node->type) {
+	case NODE_ROOT:
+		fprintf(stderr, "[error] %s: trying to reparent root node\n", __func__);
+		return -EINVAL;
+
+	case NODE_EVENT:
+		if (parent->type == NODE_ROOT)
+			cds_list_add(&node->siblings, &parent->u.root.event);
+		else
+			return -EPERM;
+		break;
+	case NODE_STREAM:
+		if (parent->type == NODE_ROOT)
+			cds_list_add(&node->siblings, &parent->u.root.stream);
+		else
+			return -EPERM;
+		break;
+	case NODE_TRACE:
+		if (parent->type == NODE_ROOT)
+			cds_list_add(&node->siblings, &parent->u.root.trace);
+		else
+			return -EPERM;
+		break;
+
+	case NODE_CTF_EXPRESSION:
+		return reparent_ctf_expression(node, parent);
+
+	case NODE_TYPEDEF:
+		return reparent_typedef(node, parent);
+	case NODE_TYPEALIAS_TARGET:
+		if (parent->type == NODE_TYPEALIAS)
+			parent->u.typealias.target = node;
+		else
+			return -EINVAL;
+	case NODE_TYPEALIAS_ALIAS:
+		if (parent->type == NODE_TYPEALIAS)
+			parent->u.typealias.alias = node;
+		else
+			return -EINVAL;
+	case NODE_TYPEALIAS:
+		return reparent_typealias(node, parent);
+
+	case NODE_TYPE_SPECIFIER:
+		if (parent->type == NODE_DECLARATION_SPECIFIER)
+			cds_list_add(&node->siblings, &parent->u.declaration_specifier.type_specifiers);
+		else
+			return -EPERM;
+		break;
+	case NODE_DECLARATION_SPECIFIER:
+		return reparent_declaration_specifier(node, parent);
+	case NODE_POINTER:
+		if (parent->type == NODE_TYPE_DECLARATOR)
+			cds_list_add(&node->siblings, &parent->u.type_declarator.pointers);
+		else
+			return -EPERM;
+		break;
+	case NODE_TYPE_DECLARATOR:
+		return reparent_type_declarator(node, parent);
+
+	case NODE_FLOATING_POINT:
+		if (parent->type == NODE_TYPE_SPECIFIER) {
+			parent->u.type_specifier.type = TYPESPEC_FLOATING_POINT;
+			parent->u.type_specifier.u.floating_point = node;
+		} else
+			return -EPERM;
+		break;
+	case NODE_INTEGER:
+		if (parent->type == NODE_TYPE_SPECIFIER) {
+			parent->u.type_specifier.type = TYPESPEC_INTEGER;
+			parent->u.type_specifier.u.integer = node;
+		} else
+			return -EPERM;
+		break;
+	case NODE_STRING:
+		if (parent->type == NODE_TYPE_SPECIFIER) {
+			parent->u.type_specifier.type = TYPESPEC_STRING;
+			parent->u.type_specifier.u.string = node;
+		} else
+			return -EPERM;
+		break;
+	case NODE_ENUMERATOR:
+		if (parent->type == NODE_ENUM)
+			cds_list_add(&node->siblings, &parent->u._enum.enumerator_list);
+		else
+			return -EPERM;
+		break;
+	case NODE_ENUM:
+		if (parent->type == NODE_TYPE_SPECIFIER) {
+			parent->u.type_specifier.type = TYPESPEC_ENUM;
+			parent->u.type_specifier.u._enum = node;
+		} else
+			return -EPERM;
+		break;
+	case NODE_STRUCT_OR_VARIANT_DECLARATION:
+		switch (parent->type) {
+		case NODE_STRUCT:
+			cds_list_add(&node->siblings, &parent->u.variant.declaration_list);
+			break;
+		case NODE_VARIANT:
+			cds_list_add(&node->siblings, &parent->u._struct.declaration_list);
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+	case NODE_VARIANT:
+		if (parent->type == NODE_TYPE_SPECIFIER) {
+			parent->u.type_specifier.type = TYPESPEC_VARIANT;
+			parent->u.type_specifier.u.variant = node;
+		} else
+			return -EPERM;
+		break;
+	case NODE_STRUCT:
+		if (parent->type == NODE_TYPE_SPECIFIER) {
+			parent->u.type_specifier.type = TYPESPEC_STRUCT;
+			parent->u.type_specifier.u._struct = node;
+		} else
+			return -EPERM;
+		break;
+
+	case NODE_UNKNOWN:
+	default:
+		fprintf(stderr, "[error] %s: unknown node type %d\n", __func__,
+			(int) parent->type);
+		return -EINVAL;
+	}
+	return 0;
 }
 
-void yyerror(const char *str)
+void yyerror(struct ctf_scanner *scanner, const char *str)
 {
 	fprintf(stderr, "error %s\n", str);
 }
@@ -142,28 +655,101 @@ int yywrap(void)
 	return 1;
 } 
 
-static void free_strings(void)
+static void free_strings(struct cds_list_head *list)
 {
 	struct gc_string *gstr, *tmp;
 
-	cds_list_for_each_entry_safe(gstr, tmp, &allocated_strings, gc)
+	cds_list_for_each_entry_safe(gstr, tmp, list, gc)
 		free(gstr);
 }
 
-int main(int argc, char **argv)
+static struct ctf_ast *ctf_ast_alloc(void)
 {
-	yydebug = 1;
-	init_scope(&root_scope, NULL);
-	yyparse();
-	finalize_scope(&root_scope);
-	free_strings();
-	return 0;
-} 
+	struct ctf_ast *ast;
+
+	ast = malloc(sizeof(*ast));
+	if (!ast)
+		return NULL;
+	memset(ast, 0, sizeof(*ast));
+	CDS_INIT_LIST_HEAD(&ast->allocated_nodes);
+	ast->root.type = NODE_ROOT;
+	CDS_INIT_LIST_HEAD(&ast->root.siblings);
+	CDS_INIT_LIST_HEAD(&ast->root.u.root._typedef);
+	CDS_INIT_LIST_HEAD(&ast->root.u.root.typealias);
+	CDS_INIT_LIST_HEAD(&ast->root.u.root.declaration_specifier);
+	CDS_INIT_LIST_HEAD(&ast->root.u.root.trace);
+	CDS_INIT_LIST_HEAD(&ast->root.u.root.stream);
+	CDS_INIT_LIST_HEAD(&ast->root.u.root.event);
+	return ast;
+}
+
+static void ctf_ast_free(struct ctf_ast *ast)
+{
+	struct ctf_node *node, *tmp;
+
+	cds_list_for_each_entry_safe(node, tmp, &ast->allocated_nodes, gc)
+		free(node);
+}
+
+int ctf_scanner_append_ast(struct ctf_scanner *scanner)
+{
+	return yyparse(scanner);
+}
+
+struct ctf_scanner *ctf_scanner_alloc(FILE *input)
+{
+	struct ctf_scanner *scanner;
+	int ret;
+
+	scanner = malloc(sizeof(*scanner));
+	if (!scanner)
+		return NULL;
+	memset(scanner, 0, sizeof(*scanner));
+
+	ret = yylex_init_extra(scanner, &scanner->scanner);
+	if (ret) {
+		fprintf(stderr, "yylex_init error\n");
+		goto cleanup_scanner;
+	}
+	yyset_in(input, scanner);
+
+	scanner->ast = ctf_ast_alloc();
+	if (!scanner->ast)
+		goto cleanup_lexer;
+	init_scope(&scanner->root_scope, NULL);
+	CDS_INIT_LIST_HEAD(&scanner->allocated_strings);
+
+	return scanner;
+
+cleanup_lexer:
+	ret = yylex_destroy(scanner->scanner);
+	if (!ret)
+		fprintf(stderr, "yylex_destroy error\n");
+cleanup_scanner:
+	free(scanner);
+	return NULL;
+}
+
+void ctf_scanner_free(struct ctf_scanner *scanner)
+{
+	int ret;
+
+	finalize_scope(&scanner->root_scope);
+	free_strings(&scanner->allocated_strings);
+	ctf_ast_free(scanner->ast);
+	ret = yylex_destroy(scanner->scanner);
+	if (ret)
+		fprintf(stderr, "yylex_destroy error\n");
+	free(scanner);
+}
 
 %}
 
+%define api.pure
+	/* %locations */
+%parse-param {struct ctf_scanner *scanner}
+%lex-param {struct ctf_scanner *scanner}
 %start file
-/* %glr-parser */
 %token CHARACTER_CONSTANT_START SQUOTE STRING_LITERAL_START DQUOTE ESCSEQ CHAR_STRING_TOKEN LSBRAC RSBRAC LPAREN RPAREN LBRAC RBRAC RARROW STAR PLUS MINUS LT GT TYPEASSIGN COLON SEMICOLON DOTDOTDOT DOT EQUAL COMMA CONST CHAR DOUBLE ENUM EVENT FLOATING_POINT FLOAT INTEGER INT LONG SHORT SIGNED STREAM STRING STRUCT TRACE TYPEALIAS TYPEDEF UNSIGNED VARIANT VOID _BOOL _COMPLEX _IMAGINARY DECIMAL_CONSTANT OCTAL_CONSTANT HEXADECIMAL_CONSTANT
 %token <gs> IDENTIFIER ID_TYPE
 %token ERROR
@@ -175,12 +761,10 @@ int main(int argc, char **argv)
 	struct ctf_node *n;
 }
 
-/* %token <c>UPPERCASE_L LOWERCASE_L _U _NONDIGIT */
-/*%type <n> decl type_decl event_decl stream_decl trace_decl type_def
-%type <n> event_attrib field_attrib assign_attrib 
-%type <n> event_attrib_list attrib_list field_list appendval_list
-%type <n> field value type_expr typename typename_postfix
-%type <gs> typename_prefix identifier */
+%type <n> event_declaration
+%type <n> ctf_assignment_expression_list
+%type <n> ctf_assignment_expression
+
 %%
 
 file:
@@ -285,20 +869,20 @@ declaration:
 event_declaration:
 		event_declaration_begin event_declaration_end
 	|	event_declaration_begin ctf_assignment_expression_list event_declaration_end
+		{
+			$$ = make_node(scanner, NODE_EVENT);
+			/* TODO */
+		}
 	;
 
 event_declaration_begin:
 		EVENT LBRAC
-		{
-			push_scope();
-		}
+		{	push_scope(scanner);	}
 	;
 
 event_declaration_end:
 		RBRAC SEMICOLON
-		{
-			pop_scope();
-		}
+		{	pop_scope(scanner);	}
 	;
 
 
@@ -309,16 +893,12 @@ stream_declaration:
 
 stream_declaration_begin:
 		STREAM LBRAC
-		{
-			push_scope();
-		}
+		{	push_scope(scanner);	}
 	;
 
 stream_declaration_end:
 		RBRAC SEMICOLON
-		{
-			pop_scope();
-		}
+		{	pop_scope(scanner);	}
 	;
 
 
@@ -329,16 +909,12 @@ trace_declaration:
 
 trace_declaration_begin:
 		TRACE LBRAC
-		{
-			push_scope();
-		}
+		{	push_scope(scanner);	}
 	;
 
 trace_declaration_end:
 		RBRAC SEMICOLON
-		{
-			pop_scope();
-		}
+		{	pop_scope(scanner);	}
 	;
 
 declaration_specifiers:
@@ -392,16 +968,12 @@ struct_type_specifier:
 
 struct_declaration_begin:
 		LBRAC
-		{
-			push_scope();
-		}
+		{	push_scope(scanner);	}
 	;
 
 struct_declaration_end:
 		RBRAC
-		{
-			pop_scope();
-		}
+		{	pop_scope(scanner);	}
 	;
 
 variant_type_specifier:
@@ -422,16 +994,12 @@ variant_type_specifier:
 
 variant_declaration_begin:
 		LBRAC
-		{
-			push_scope();
-		}
+		{	push_scope(scanner);	}
 	;
 
 variant_declaration_end:
 		RBRAC
-		{
-			pop_scope();
-		}
+		{	pop_scope(scanner);	}
 	;
 
 type_specifier_or_integer_constant:
@@ -546,9 +1114,7 @@ type_declarator:
 
 direct_type_declarator:
 		IDENTIFIER
-		{
-			add_type($1->s);
-		}
+		{	add_type(scanner, $1->s);	}
 	|	LPAREN type_declarator RPAREN
 	|	direct_type_declarator LSBRAC type_specifier_or_integer_constant RSBRAC
 	;
@@ -561,9 +1127,7 @@ abstract_type_declarator:
 direct_abstract_type_declarator:
 		/* empty */
 	|	IDENTIFIER
-		{
-			add_type($1->s);
-		}
+		{	add_type(scanner, $1->s);	}
 	|	LPAREN abstract_type_declarator RPAREN
 	|	direct_abstract_type_declarator LSBRAC type_specifier_or_integer_constant RSBRAC
 	|	direct_abstract_type_declarator LSBRAC RSBRAC
@@ -589,6 +1153,11 @@ ctf_assignment_expression_list:
 
 ctf_assignment_expression:
 		unary_expression EQUAL unary_expression
+		{
+			$$ = make_node(scanner, NODE_CTF_EXPRESSION);
+			/* TODO */
+			
+		}
 	|	unary_expression TYPEASSIGN type_specifier
 	|	declaration_specifiers TYPEDEF declaration_specifiers type_declarator_list
 	|	TYPEDEF declaration_specifiers type_declarator_list