dwarves_emit: Introduce type_emissions

We may want to work on just one object file, not on a multi cu.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

codiff.c

@@ -695,8 +695,8 @@ failure:
 	dwarves__init(0);
 
 	structs_printed = strlist__new(false);
-	old_cus = cus__new(NULL, NULL);
-	new_cus = cus__new(NULL, NULL);
+	old_cus = cus__new(NULL);
+	new_cus = cus__new(NULL);
 	if (old_cus == NULL || new_cus == NULL || structs_printed == NULL) {
 		fputs("codiff: insufficient memory\n", stderr);
 		return EXIT_FAILURE;

ctracer.c

@@ -61,8 +61,7 @@ static FILE *fp_classes;
  * List of definitions and forward declarations already emitted for
  * methods_cus, to avoid duplication.
  */
-static LIST_HEAD(cus__definitions);
-static LIST_HEAD(cus__fwd_decls);
+static struct type_emissions cus__emissions;
 
 /*
  * CU blacklist: if a "blacklist.cu" file is present, don't consider the
@@ -910,13 +909,15 @@ failure:
 	 */
 	dwarves__init(0);
 
+	type_emissions__init(&cus__emissions);
+
         /*
          * Create the methods_cus (Compilation Units) object where we will
 	 * load the objects where we'll look for functions pointers to the
 	 * specified class, i.e. to find its "methods", where we'll insert
 	 * the entry and exit hooks.
          */
-	methods_cus = cus__new(&cus__definitions, &cus__fwd_decls);
+	methods_cus = cus__new(&cus__emissions);
 	if (methods_cus == NULL) {
 		fputs("ctracer: insufficient memory\n", stderr);
 		return EXIT_FAILURE;

dtagnames.c

@@ -42,7 +42,7 @@ static void cus__dump_class_tag_names(struct cus *self)
 int main(int argc, char *argv[])
 {
 	int err;
-	struct cus *cus = cus__new(NULL, NULL);
+	struct cus *cus = cus__new(NULL);
 
 	if (cus == NULL) {
 		fputs("dtagnames: insufficient memory\n", stderr);

dwarves.c

@@ -2489,6 +2489,12 @@ size_t tag__fprintf(struct tag *self, const struct cu *cu,
 	return printed;
 }
 
+void type_emissions__init(struct type_emissions *self)
+{
+	INIT_LIST_HEAD(&self->definitions);
+	INIT_LIST_HEAD(&self->fwd_decls);
+}
+
 int cu__for_each_tag(struct cu *self,
 		     int (*iterator)(struct tag *tag, struct cu *cu,
 			     	     void *cookie),
@@ -2615,17 +2621,18 @@ void cus__print_error_msg(const char *progname, const struct cus *cus,
 		fprintf(stderr, "%s: %s\n", progname, strerror(err));
 }
 
-struct cus *cus__new(struct list_head *definitions,
-		     struct list_head *fwd_decls)
+struct cus *cus__new(struct type_emissions *emissions)
 {
-	struct cus *self = malloc(sizeof(*self));
+	struct cus *self = malloc(sizeof(*self) + (emissions ? 0 : sizeof(*emissions)));
 
 	if (self != NULL) {
 		INIT_LIST_HEAD(&self->cus);
-		INIT_LIST_HEAD(&self->priv_definitions);
-		INIT_LIST_HEAD(&self->priv_fwd_decls);
-		self->definitions = definitions ?: &self->priv_definitions;
-		self->fwd_decls = fwd_decls ?: &self->priv_fwd_decls;
+		if (emissions != NULL)
+			self->emissions = emissions;
+		else {
+			self->emissions = (struct type_emissions *)(self + 1);
+			type_emissions__init(self->emissions);
+		}
 	}
 
 	return self;

dwarves.h

@@ -20,14 +20,20 @@
 
 struct argp;
 
-struct cus {
-	struct list_head cus;
-	struct list_head priv_definitions; /* struct type entries */
-	struct list_head priv_fwd_decls;   /* struct class entries */
-	struct list_head *definitions;
-	struct list_head *fwd_decls;
+struct type_emissions {
+	struct list_head definitions; /* struct type entries */
+	struct list_head fwd_decls;   /* struct class entries */
 };
 
+void type_emissions__init(struct type_emissions *self);
+
+struct cus {
+	struct list_head      cus;
+	struct type_emissions *emissions;
+};
+
+struct cus *cus__new(struct type_emissions *emissions);
+
 #define HASHTAGS__BITS 8
 #define HASHTAGS__SIZE (1UL << HASHTAGS__BITS)
 #define hashtags__fn(key) hash_64(key, HASHTAGS__BITS)
@@ -522,8 +528,6 @@ extern size_t lexblock__fprintf(const struct lexblock *self,
 				const struct cu *cu, struct function *function,
 				uint16_t indent, FILE *fp);
 
-extern struct cus *cus__new(struct list_head *definitions,
-			    struct list_head *fwd_decls);
 extern int cus__loadfl(struct cus *self, struct argp *argp,
 		       int argc, char *argv[]);
 extern int cus__load(struct cus *self, const char *filename);

dwarves_emit.c

@@ -20,14 +20,14 @@ static void cus__add_definition(struct cus *self, struct type *type)
 	type->definition_emitted = 1;
 	if (!list_empty(&type->node))
 		list_del(&type->node);
-	list_add_tail(&type->node, self->definitions);
+	list_add_tail(&type->node, &self->emissions->definitions);
 }
 
 static void cus__add_fwd_decl(struct cus *self, struct type *type)
 {
 	type->fwd_decl_emitted = 1;
 	if (list_empty(&type->node))
-		list_add_tail(&type->node, self->fwd_decls);
+		list_add_tail(&type->node, &self->emissions->fwd_decls);
 }
 
 struct type *cus__find_definition(const struct cus *self, const char *name)
@@ -37,7 +37,7 @@ struct type *cus__find_definition(const struct cus *self, const char *name)
 	if (name == NULL)
 		return NULL;
 
-	list_for_each_entry(pos, self->definitions, node)
+	list_for_each_entry(pos, &self->emissions->definitions, node)
 		if (type__name(pos, NULL) != NULL &&
 		    strcmp(type__name(pos, NULL), name) == 0)
 			return pos;
@@ -50,7 +50,7 @@ static struct type *cus__find_fwd_decl(const struct cus *self,
 {
 	struct type *pos;
 
-	list_for_each_entry(pos, self->fwd_decls, node)
+	list_for_each_entry(pos, &self->emissions->fwd_decls, node)
 		if (strcmp(type__name(pos, NULL), name) == 0)
 			return pos;
 

pahole.c

@@ -959,7 +959,7 @@ int main(int argc, char *argv[])
 	struct cus *cus;
 	int err;
 
-	cus = cus__new(NULL, NULL);
+	cus = cus__new(NULL);
 	if (cus == NULL) {
 		fputs("pahole: insufficient memory\n", stderr);
 		return EXIT_FAILURE;

pdwtags.c

@@ -89,7 +89,7 @@ static struct argp pdwtags__argp = {
 int main(int argc, char *argv[])
 {
 	int err;
-	struct cus *cus = cus__new(NULL, NULL);
+	struct cus *cus = cus__new(NULL);
 
 	if (cus == NULL) {
 		fputs("pwdtags: insufficient memory\n", stderr);

pfunct.c

@@ -492,7 +492,7 @@ int main(int argc, char *argv[])
 {
 	int err;
 
-	cus = cus__new(NULL, NULL);
+	cus = cus__new(NULL);
 	if (cus == NULL) {
 		fputs("pfunct: insufficient memory\n", stderr);
 		return EXIT_FAILURE;

pglobal.c

@@ -310,7 +310,7 @@ static struct argp pglobal__argp = {
 int main(int argc, char *argv[])
 {
 	int err;
-	struct cus *cus = cus__new(NULL, NULL);
+	struct cus *cus = cus__new(NULL);
 
 	if (cus == NULL) {
 		fputs("pglobal: insufficient memory\n", stderr);

prefcnt.c

@@ -150,7 +150,7 @@ static int cu_lost_iterator(struct cu *cu, void *cookie)
 int main(int argc, char *argv[])
 {
 	int err;
-	struct cus *cus = cus__new(NULL, NULL);
+	struct cus *cus = cus__new(NULL);
 
 	if (cus == NULL) {
 		fputs("prefcnt: insufficient memory\n", stderr);

syscse.c

@@ -143,7 +143,7 @@ static struct argp argp = {
 int main(int argc, char *argv[])
 {
 	int err;
-	struct cus *cus = cus__new(NULL, NULL);
+	struct cus *cus = cus__new(NULL);
 
 	if (cus == NULL) {
 		fprintf(stderr, "%s: insufficient memory\n", argv[0]);