ecpg: improve preprocessor's memory management.

Invent a notion of "local" storage that will automatically be
reclaimed at the end of each statement.  Use this for location
strings as well as other visibly short-lived data within the parser.

Also, make cat_str and make_str return local storage and not free
their inputs, which allows dispensing with a whole lot of retail
mm_strdup calls.  We do have to add some new ones in places where
a local-lifetime string needs to be added to a longer-lived data
structure, but on balance there are a lot less mm_strdup calls than
before.

In hopes of flushing out places where changes were necessary,
I changed YYLTYPE from "char *" to "const char *", which forced
const-ification of various function arguments that probably
should've been like that all along.

This still leaks somewhat more memory than v17, but that will be
cleaned up in future commits.

Discussion: https://postgr.es/m/2011420.1713493114@sss.pgh.pa.us

Author: tglsfdc

src/interfaces/ecpg/preproc/descriptor.c

@@ -18,13 +18,12 @@
 static struct assignment *assignments;
 
 void
-push_assignment(char *var, enum ECPGdtype value)
+push_assignment(const char *var, enum ECPGdtype value)
 {
 	struct assignment *new = (struct assignment *) mm_alloc(sizeof(struct assignment));
 
 	new->next = assignments;
-	new->variable = mm_alloc(strlen(var) + 1);
-	strcpy(new->variable, var);
+	new->variable = mm_strdup(var);
 	new->value = value;
 	assignments = new;
 }
@@ -73,7 +72,7 @@ ECPGnumeric_lvalue(char *name)
 static struct descriptor *descriptors;
 
 void
-add_descriptor(char *name, char *connection)
+add_descriptor(const char *name, const char *connection)
 {
 	struct descriptor *new;
 
@@ -83,20 +82,16 @@ add_descriptor(char *name, char *connection)
 	new = (struct descriptor *) mm_alloc(sizeof(struct descriptor));
 
 	new->next = descriptors;
-	new->name = mm_alloc(strlen(name) + 1);
-	strcpy(new->name, name);
+	new->name = mm_strdup(name);
 	if (connection)
-	{
-		new->connection = mm_alloc(strlen(connection) + 1);
-		strcpy(new->connection, connection);
-	}
+		new->connection = mm_strdup(connection);
 	else
-		new->connection = connection;
+		new->connection = NULL;
 	descriptors = new;
 }
 
 void
-drop_descriptor(char *name, char *connection)
+drop_descriptor(const char *name, const char *connection)
 {
 	struct descriptor *i;
 	struct descriptor **lastptr = &descriptors;
@@ -126,9 +121,8 @@ drop_descriptor(char *name, char *connection)
 		mmerror(PARSE_ERROR, ET_WARNING, "descriptor %s bound to the default connection does not exist", name);
 }
 
-struct descriptor
-		   *
-lookup_descriptor(char *name, char *connection)
+struct descriptor *
+lookup_descriptor(const char *name, const char *connection)
 {
 	struct descriptor *i;
 
@@ -159,7 +153,7 @@ lookup_descriptor(char *name, char *connection)
 }
 
 void
-output_get_descr_header(char *desc_name)
+output_get_descr_header(const char *desc_name)
 {
 	struct assignment *results;
 
@@ -178,7 +172,7 @@ output_get_descr_header(char *desc_name)
 }
 
 void
-output_get_descr(char *desc_name, char *index)
+output_get_descr(const char *desc_name, const char *index)
 {
 	struct assignment *results;
 
@@ -211,7 +205,7 @@ output_get_descr(char *desc_name, char *index)
 }
 
 void
-output_set_descr_header(char *desc_name)
+output_set_descr_header(const char *desc_name)
 {
 	struct assignment *results;
 
@@ -272,7 +266,7 @@ descriptor_item_name(enum ECPGdtype itemcode)
 }
 
 void
-output_set_descr(char *desc_name, char *index)
+output_set_descr(const char *desc_name, const char *index)
 {
 	struct assignment *results;