X-Git-Url: https://git.m6w6.name/?p=m6w6%2Fext-psi;a=blobdiff_plain;f=src%2Fparser_proc.y;h=7f38f178585f9d5673c426b3d3b31d36ecd303c7;hp=32cba5d48daa207f3f669a438a5e062bee1e09bd;hb=e16c15d5936c3b57b05e49570fb9526920de8188;hpb=d560a27ff8431c678d25ecf4d8190b562a766f41

diff --git a/src/parser_proc.y b/src/parser_proc.y
index 32cba5d..7f38f17 100644
--- a/src/parser_proc.y
+++ b/src/parser_proc.y
@@ -15,18 +15,24 @@
 %extra_argument {PSI_Parser *P}
 /* TOKEN is defined inside syntax_error */
 %syntax_error {
-	PSI_ParserSyntaxError(P, P->psi.file.fn, P->line, "Unexpected token '%s'", TOKEN->text);
-	TOKEN->type = PSI_T_NAME;
+	if (TOKEN && TOKEN->type != PSI_T_EOF) {
+		PSI_ParserSyntaxError(P, P->psi.file.fn, P->line, "Unexpected token '%s'", TOKEN->text);
+	} else {
+		PSI_ParserSyntaxError(P, P->psi.file.fn, P->line, "Unexpected end of input");
+	}
 }
 
 %nonassoc NAME.
+%left PLUS MINUS.
+%left SLASH ASTERISK.
+%fallback NAME TEMP FREE SET LET RETURN LIB INT UNSIGNED.
 
 file ::= blocks.
 
 blocks ::= block.
 blocks ::= blocks block.
 
-block ::= COMMENT.
+block ::= EOF.
 
 block ::= LIB(T) QUOTED_STRING(libname) EOS. {
 	if (P->psi.file.ln) {
@@ -59,26 +65,25 @@ block ::= decl_struct(strct). {
 
 %type decl_struct {decl_struct*}
 %destructor decl_struct {free_decl_struct($$);}
-decl_struct(strct) ::= STRUCT NAME(N) LBRACE struct_args(args) RBRACE. {
+decl_struct(strct) ::= STRUCT NAME(N) struct_size(size_) LBRACE struct_args(args) RBRACE. {
 	strct = init_decl_struct(N->text, args);
+	strct->size = size_;
 	free(N);
 }
 
-%type const_type {const_type*}
-%destructor const_type {free_const_type($$);}
-const_type(type_) ::= BOOL(T). {
-	type_ = init_const_type(T->type, T->text);
-	free(T);
+%type struct_size {size_t}
+struct_size(size) ::= . {
+	size = 0;
 }
-const_type(type_) ::= INT(T). {
-	type_ = init_const_type(T->type, T->text);
-	free(T);
-}
-const_type(type_) ::= FLOAT(T). {
-	type_ = init_const_type(T->type, T->text);
-	free(T);
+struct_size(size) ::= COLON COLON LPAREN NUMBER(SIZ) RPAREN. {
+	size = atol(SIZ->text);
+	free(SIZ);
 }
-const_type(type_) ::= STRING(T). {
+
+%token_class const_type_token BOOL INT FLOAT STRING.
+%type const_type {const_type*}
+%destructor const_type {free_const_type($$);}
+const_type(type_) ::= const_type_token(T). {
 	type_ = init_const_type(T->type, T->text);
 	free(T);
 }
@@ -95,22 +100,48 @@ decl_typedef(def) ::= TYPEDEF decl_type(type) NAME(ALIAS) EOS. {
 	def = init_decl_typedef(ALIAS->text, type);
 	free(ALIAS);
 }
+/* support opaque types */
+decl_typedef(def) ::= TYPEDEF VOID(V) NAME(ALIAS) EOS. {
+	def = init_decl_typedef(ALIAS->text, init_decl_type(V->type, V->text));
+	def->type->token = V;
+	//free(V);
+	free(ALIAS);
+}
 decl_typedef(def) ::= TYPEDEF STRUCT(S) NAME(N) NAME(ALIAS) EOS. {
 	def = init_decl_typedef(ALIAS->text, init_decl_type(S->type, N->text));
+	def->type->token = N;
 	free(ALIAS);
 	free(S);
-	free(N);
+	//free(N);
 }
 decl_typedef(def) ::= TYPEDEF decl_struct(s) NAME(ALIAS) EOS. {
 	def = init_decl_typedef(ALIAS->text, init_decl_type(PSI_T_STRUCT, s->name));
+	def->type->token = ALIAS;
 	def->type->strct = s;
-	free(ALIAS);
+	//free(ALIAS);
 }
 
 %type decl {decl*}
 %destructor decl {free_decl($$);}
-decl(decl) ::= decl_abi(abi) decl_arg(func) LPAREN decl_args(args) RPAREN EOS. {
+decl(decl) ::= decl_abi(abi) decl_func(func) LPAREN decl_args(args) RPAREN EOS. {
 	decl = init_decl(abi, func, args);
+
+}
+
+%type decl_func {decl_arg*}
+%destructor decl_func {free_decl_arg($$);}
+decl_func(func) ::= decl_arg(arg). {
+	func = arg;
+}
+/* special case for void functions */
+decl_func(func) ::= VOID(T) NAME(N). {
+	func = init_decl_arg(
+		init_decl_type(T->type, T->text),
+		init_decl_var(N->text, 0, 0)
+	);
+	func->type->token = T;
+	//free(T);
+	free(N);
 }
 
 %type decl_abi {decl_abi*}
@@ -122,20 +153,11 @@ decl_abi(abi) ::= NAME(T). {
 
 %type decl_var {decl_var*}
 %destructor decl_var {free_decl_var($$);}
-decl_var(var) ::= NAME(T). {
-	var = init_decl_var(T->text, 0, 0);
-	free(T);
-}
-decl_var(var) ::= pointers(p) NAME(T). {
+decl_var(var) ::= indirection(p) NAME(T). {
 	var = init_decl_var(T->text, p, 0);
 	free(T);
 }
-decl_var(var) ::= NAME(T) LBRACKET NUMBER(D) RBRACKET. {
-	var = init_decl_var(T->text, 1, atol(D->text));
-	free(T);
-	free(D);
-}
-decl_var(var) ::= pointers(p) NAME(T) LBRACKET NUMBER(D) RBRACKET. {
+decl_var(var) ::= indirection(p) NAME(T) LBRACKET NUMBER(D) RBRACKET. {
 	var = init_decl_var(T->text, p+1, atol(D->text));
 	free(T);
 	free(D);
@@ -152,12 +174,32 @@ decl_vars(vars) ::= decl_vars(vars_) COMMA decl_var(var). {
 
 %type decl_arg {decl_arg*}
 %destructor decl_arg {free_decl_arg($$);}
-decl_arg(arg_) ::= decl_type(type) decl_var(var). {
-	arg_ = var->arg = init_decl_arg(type, var);
+decl_arg(arg_) ::= const_decl_type(type) decl_var(var). {
+	arg_ = init_decl_arg(type, var);
+}
+/* void pointers need a specific rule */
+decl_arg(arg_) ::= VOID(T) pointers(p) NAME(N). {
+	arg_ = init_decl_arg(
+		init_decl_type(T->type, T->text),
+		init_decl_var(N->text, p, 0)
+	);
+	arg_->type->token = T;
+	//free(T);
+	free(N);
+}
+decl_arg(arg_) ::= CONST VOID(T) pointers(p) NAME(N). {
+	arg_ = init_decl_arg(
+		init_decl_type(T->type, T->text),
+		init_decl_var(N->text, p, 0)
+	);
+	arg_->type->token = T;
+	//free(T);
+	free(N);
 }
 
 %type decl_args {decl_args*}
 %destructor decl_args {free_decl_args($$);}
+decl_args ::= .
 decl_args ::= VOID.
 decl_args(args) ::= decl_arg(arg). {
 	args = init_decl_args(arg);
@@ -165,74 +207,76 @@ decl_args(args) ::= decl_arg(arg). {
 decl_args(args) ::= decl_args(args_) COMMA decl_arg(arg). {
 	args = add_decl_arg(args_, arg);
 }
+decl_args(args) ::= decl_args(args_) COMMA ELLIPSIS. {
+	args = args_;
+	args->varargs = 1;
+}
 %type struct_args {decl_args*}
 %destructor struct_args {free_decl_args($$);}
-struct_args(args) ::= decl_arg(arg) EOS. {
+struct_args(args) ::= struct_arg(arg). {
 	args = init_decl_args(arg);
 }
-struct_args(args) ::= struct_args(args_) decl_arg(arg) EOS. {
+struct_args(args) ::= struct_args(args_) struct_arg(arg). {
 	args = add_decl_arg(args_, arg);
 }
+%type struct_arg {decl_arg*}
+%destructor struct_arg {free_decl_arg($$);}
+struct_arg(arg) ::= decl_arg(arg_) struct_layout(layout_) EOS. {
+	arg_->layout = layout_;
+	arg = arg_;
+}
+
+%type struct_layout {decl_struct_layout*}
+%destructor struct_layout {free_decl_struct_layout($$);}
+struct_layout(layout) ::= . {
+	layout = NULL;
+}
+struct_layout(layout) ::= COLON COLON LPAREN NUMBER(POS) COMMA NUMBER(SIZ) RPAREN. {
+	layout = init_decl_struct_layout(atol(POS->text), atol(SIZ->text));
+	free(POS);
+	free(SIZ);
+}
 
+%token_class decl_type_token FLOAT DOUBLE INT8 UINT8 INT16 UINT16 INT32 UINT32 INT64 UINT64 NAME.
 %type decl_type {decl_type*}
 %destructor decl_type {free_decl_type($$);}
-decl_type(type_) ::= VOID(T). {
+decl_type(type_) ::= decl_type_token(T). {
 	type_ = init_decl_type(T->type, T->text);
-	free(T);
+	type_->token = T;
+	//free(T);
 }
-decl_type(type_) ::= FLOAT(T). {
+/* unsigned, urgh */
+decl_type(type_) ::= UNSIGNED NAME(T). {
 	type_ = init_decl_type(T->type, T->text);
-	free(T);
-}
-decl_type(type_) ::= DOUBLE(T). {
-	type_ = init_decl_type(T->type, T->text);
-	free(T);
+	type_->token = T;
+	type_->name = realloc(type_->name, T->size + sizeof("unsigned"));
+	memmove(type_->name + sizeof("unsigned"), type_->name, T->size);
+	memcpy(type_->name, "unsigned", sizeof("unsigned")-1);
+	type_->name[sizeof("unsigned")] = ' ';
+	type_->name[T->size + sizeof("unsigned")] = 0;
+	//free(T);
 }
 /* we have to support plain int here because we have it in our lexer rules */
 decl_type(type_) ::= INT(T). {
 	type_ = init_decl_type(PSI_T_NAME, T->text);
-	free(T);
-}
-decl_type(type_) ::= INT8(T). {
-	type_ = init_decl_type(T->type, T->text);
-	free(T);
-}
-decl_type(type_) ::= UINT8(T). {
-	type_ = init_decl_type(T->type, T->text);
-	free(T);
-}
-decl_type(type_) ::= INT16(T). {
-	type_ = init_decl_type(T->type, T->text);
-	free(T);
-}
-decl_type(type_) ::= UINT16(T). {
-	type_ = init_decl_type(T->type, T->text);
-	free(T);
-}
-decl_type(type_) ::= INT32(T). {
-	type_ = init_decl_type(T->type, T->text);
-	free(T);
-}
-decl_type(type_) ::= UINT32(T). {
-	type_ = init_decl_type(T->type, T->text);
-	free(T);
-}
-decl_type(type_) ::= INT64(T). {
-	type_ = init_decl_type(T->type, T->text);
-	free(T);
-}
-decl_type(type_) ::= UINT64(T). {
-	type_ = init_decl_type(T->type, T->text);
-	free(T);
-}
-decl_type(type_) ::= NAME(T). {
-	type_ = init_decl_type(T->type, T->text);
-	free(T);
+	type_->token = T;
+	//free(T);
 }
+/* structs ! */
 decl_type(type_) ::= STRUCT(S) NAME(T). {
 	type_ = init_decl_type(S->type, T->text);
+	type_->token = T;
 	free(S);
-	free(T);
+	//free(T);
+}
+
+%type const_decl_type {decl_type*}
+%destructor const_decl_type {free_decl_type($$);}
+const_decl_type(type) ::= decl_type(type_). {
+	type = type_;
+}
+const_decl_type(type) ::= CONST decl_type(type_). {
+	type = type_;
 }
 
 %type impl {impl*}
@@ -243,46 +287,23 @@ impl(impl) ::= impl_func(func) LBRACE impl_stmts(stmts) RBRACE. {
 
 %type impl_func {impl_func*}
 %destructor impl_func {free_impl_func($$);}
-impl_func(func) ::= FUNCTION NSNAME(NAME) impl_args(args) COLON impl_type(type). {
-	func = init_impl_func(NAME->text, args, type, 0);
-	free(NAME);
-}
-impl_func(func) ::= FUNCTION REFERENCE NSNAME(NAME) impl_args(args) COLON impl_type(type). {
-	func = init_impl_func(NAME->text, args, type, 1);
+impl_func(func) ::= FUNCTION reference(r) NSNAME(NAME) impl_args(args) COLON impl_type(type). {
+	func = init_impl_func(NAME->text, args, type, r);
 	free(NAME);
 }
 
+%token_class impl_def_val_token NULL NUMBER TRUE FALSE QUOTED_STRING.
 %type impl_def_val {impl_def_val*}
 %destructor impl_def_val {free_impl_def_val($$);}
-impl_def_val(def) ::= NULL(T). {
-	def = init_impl_def_val(T->type, T->text);
-	free(T);
-}
-impl_def_val(def) ::= NUMBER(T). {
-	def = init_impl_def_val(T->type, T->text);
-	free(T);
-}
-impl_def_val(def) ::= TRUE(T). {
-	def = init_impl_def_val(T->type, T->text);
-	free(T);
-}
-impl_def_val(def) ::= FALSE(T). {
-	def = init_impl_def_val(T->type, T->text);
-	free(T);
-}
-impl_def_val(def) ::= QUOTED_STRING(T). {
+impl_def_val(def) ::= impl_def_val_token(T). {
 	def = init_impl_def_val(T->type, T->text);
 	free(T);
 }
 
 %type impl_var {impl_var*}
 %destructor impl_var {free_impl_var($$);}
-impl_var(var) ::= DOLLAR NAME(T). {
-	var = init_impl_var(T->text, 0);
-	free(T);
-}
-impl_var(var) ::= REFERENCE DOLLAR NAME(T). {
-	var = init_impl_var(T->text, 1);
+impl_var(var) ::= reference(r) DOLLAR NAME(T). {
+	var = init_impl_var(T->text, r);
 	free(T);
 }
 
@@ -303,6 +324,17 @@ impl_args(args) ::= LPAREN RPAREN. {
 impl_args(args) ::= LPAREN impl_arg_list(args_) RPAREN. {
 	args = args_;
 }
+impl_args(args) ::= LPAREN impl_arg_list(args_) COMMA impl_vararg(va) RPAREN. {
+	args = args_;
+	args->vararg = va;
+}
+
+%type impl_vararg {impl_arg*}
+%destructor impl_vararg {free_impl_arg($$);}
+impl_vararg(va) ::= impl_type(type) reference(r) ELLIPSIS DOLLAR NAME(T). {
+	va = init_impl_arg(type, init_impl_var(T->text, r), NULL);
+}
+
 %type impl_arg_list {impl_args*}
 %destructor impl_arg_list {free_impl_args($$);}
 impl_arg_list(args) ::= impl_arg(arg). {
@@ -336,68 +368,66 @@ impl_stmt(stmt) ::= free_stmt(free). {
 	stmt = init_impl_stmt(PSI_T_FREE, free);
 }
 
+%token_class num_exp_token NUMBER NSNAME.
+%token_class num_exp_op_token PLUS MINUS ASTERISK SLASH.
+%type num_exp {num_exp*}
+%destructor num_exp {free_num_exp($$);}
+num_exp(exp) ::= num_exp_token(tok). {
+	exp = init_num_exp(tok->type, tok->text);
+	free(tok);
+}
+num_exp(exp) ::= decl_var(var). {
+	exp = init_num_exp(PSI_T_NAME, var);
+}
+num_exp(exp) ::= num_exp(exp_) num_exp_op_token(operator_) num_exp(operand_). {
+	exp_->operator = operator_->type;
+	exp_->operand = operand_;
+	exp = exp_;
+	free(operator_);
+}
+
 %type let_stmt {let_stmt*}
 %destructor let_stmt {free_let_stmt($$);}
 let_stmt(let) ::= LET decl_var(var) EOS. {
-	let = init_let_stmt(var, NULL);
+	let = init_let_stmt(var, init_let_val(PSI_LET_NULL, NULL));
 }
-let_stmt(let) ::= LET decl_var(var) EQUALS let_value(val) EOS. {
+let_stmt(let) ::= LET decl_var(var) EQUALS reference(r) let_val(val) EOS. {
+	val->flags.one.is_reference = r ? 1 : 0;
 	let = init_let_stmt(var, val);
 }
-
-%type let_value {let_value*}
-%destructor let_value {free_let_value($$);}
-let_value(val) ::= CALLOC(F) LPAREN NUMBER(N) COMMA decl_type(t) RPAREN. {
-	val = init_let_value(
-		init_let_func(F->type, F->text,
-			init_let_calloc(
-				atol(N->text), t
-			)
-		), NULL, 0
-	);
-	free(F);
-	free(N);
+let_stmt(let) ::= TEMP decl_var(var) EQUALS decl_var(val) EOS. {
+	let = init_let_stmt(var, init_let_val(PSI_LET_TMP, val));
 }
-let_value(val) ::= let_func(func) LPAREN impl_var(var) RPAREN. {
-	val = init_let_value(func, var, 0);
+
+%type let_val {let_val*}
+%destructor let_val {free_let_val($$);}
+let_val(val) ::= NULL. {
+	val = init_let_val(PSI_LET_NULL, NULL);
 }
-let_value(val) ::= REFERENCE let_func(func) LPAREN impl_var(var) RPAREN. {
-	val = init_let_value(func, var, 1);
+let_val(val) ::= num_exp(exp). {
+	val = init_let_val(PSI_LET_NUMEXP, exp);
 }
-let_value(val) ::= REFERENCE NULL. {
-	val = init_let_value(NULL, NULL, 1);
+let_val(val) ::= CALLOC LPAREN let_calloc(alloc) RPAREN. {
+	val = init_let_val(PSI_LET_CALLOC, alloc);
 }
-let_value(val) ::= NULL. {
-	val = init_let_value(NULL, NULL, 0);
+let_val(val) ::= let_func(func). {
+	val = init_let_val(PSI_LET_FUNC, func);
 }
 
+%type let_calloc {let_calloc*}
+%destructor let_calloc {free_let_calloc($$);}
+let_calloc(alloc) ::= num_exp(nmemb) COMMA num_exp(size). {
+	alloc = init_let_calloc(nmemb, size);
+}
+%token_class let_func_token OBJVAL ARRVAL PATHVAL STRLEN STRVAL FLOATVAL INTVAL BOOLVAL.
 %type let_func {let_func*}
 %destructor let_func {free_let_func($$);}
-let_func(func) ::= STRLEN(T). {
-	func = init_let_func(T->type, T->text, NULL);
-	free(T);
-}
-let_func(func) ::= STRVAL(T). {
-	func = init_let_func(T->type, T->text, NULL);
-	free(T);
-}
-let_func(func) ::= INTVAL(T). {
-	func = init_let_func(T->type, T->text, NULL);
-	free(T);
-}
-let_func(func) ::= FLOATVAL(T). {
-	func = init_let_func(T->type, T->text, NULL);
-	free(T);
-}
-let_func(func) ::= BOOLVAL(T). {
-	func = init_let_func(T->type, T->text, NULL);
-	free(T);
-}
-let_func(func) ::= ARRVAL(T). {
-	func = init_let_func(T->type, T->text, NULL);
+let_func(func) ::= let_func_token(T) LPAREN impl_var(var) RPAREN. {
+	func = init_let_func(T->type, T->text, var);
 	free(T);
 }
 
+
 %type set_stmt {set_stmt*}
 %destructor set_stmt {free_set_stmt($$);}
 set_stmt(set) ::= SET impl_var(var) EQUALS set_value(val) EOS. {
@@ -406,13 +436,23 @@ set_stmt(set) ::= SET impl_var(var) EQUALS set_value(val) EOS. {
 
 %type set_value {set_value*}
 %destructor set_value {free_set_value($$);}
-set_value(val) ::= set_func(func) LPAREN decl_vars(vars) RPAREN. {
-	val = init_set_value(func, vars);
+set_value(val) ::= set_func(func) LPAREN decl_var(var) RPAREN. {
+	val = init_set_value(func, init_decl_vars(var));
+}
+set_value(val) ::= set_func(func) LPAREN decl_var(var) COMMA num_exp(num_) RPAREN. {
+	val = init_set_value(func, init_decl_vars(var));
+	val->num = num_;
 }
-set_value(val) ::= set_func(func_) LPAREN decl_vars(vars_) COMMA set_vals(vals) RPAREN. {
+set_value(val) ::= set_func(func_) LPAREN decl_var(var) COMMA set_vals(vals) RPAREN. {
 	val = vals;
 	val->func = func_;
-	val->vars = vars_;
+	val->vars = init_decl_vars(var);
+}
+set_value(val) ::= set_func(func_) LPAREN decl_var(var) COMMA num_exp(num_) COMMA set_vals(vals) RPAREN. {
+	val = vals;
+	val->func = func_;
+	val->num = num_;
+	val->vars = init_decl_vars(var);
 }
 %type set_vals {set_value*}
 %destructor set_vals {free_set_value($$);}
@@ -423,29 +463,10 @@ set_vals(vals) ::= set_vals(vals_) COMMA set_value(val). {
 	vals = add_inner_set_value(vals_, val);
 }
 
+%token_class set_func_token TO_OBJECT TO_ARRAY TO_STRING TO_INT TO_FLOAT TO_BOOL VOID.
 %type set_func {set_func*}
 %destructor set_func {free_set_func($$);}
-set_func(func) ::= TO_ARRAY(T). {
-	func = init_set_func(T->type, T->text);
-	free(T);
-}
-set_func(func) ::= TO_STRING(T). {
-	func = init_set_func(T->type, T->text);
-	free(T);
-}
-set_func(func) ::= TO_INT(T). {
-	func = init_set_func(T->type, T->text);
-	free(T);
-}
-set_func(func) ::= TO_FLOAT(T). {
-	func = init_set_func(T->type, T->text);
-	free(T);
-}
-set_func(func) ::= TO_BOOL(T). {
-	func = init_set_func(T->type, T->text);
-	free(T);
-}
-set_func(func) ::= VOID(T). {
+set_func(func) ::= set_func_token(T). {
 	func = init_set_func(T->type, T->text);
 	free(T);
 }
@@ -475,39 +496,25 @@ free_calls(calls) ::= free_calls(calls_) COMMA free_call(call). {
 %destructor free_call {free_free_call($$);}
 free_call(call) ::= NAME(F) LPAREN decl_vars(vars) RPAREN. {
 	call = init_free_call(F->text, vars);
+	free(F);
 }
 
+%token_class impl_type_token VOID MIXED BOOL INT FLOAT STRING ARRAY OBJECT.
 %type impl_type {impl_type*}
 %destructor impl_type {free_impl_type($$);}
-impl_type(type_) ::= VOID(T). {
-	type_ = init_impl_type(T->type, T->text);
-	free(T);
-}
-impl_type(type_) ::= MIXED(T). {
-	type_ = init_impl_type(T->type, T->text);
-	free(T);
-}
-impl_type(type_) ::= BOOL(T). {
-	type_ = init_impl_type(T->type, T->text);
-	free(T);
-}
-impl_type(type_) ::= INT(T). {
-	type_ = init_impl_type(T->type, T->text);
-	free(T);
-}
-impl_type(type_) ::= FLOAT(T). {
-	type_ = init_impl_type(T->type, T->text);
-	free(T);
-}
-impl_type(type_) ::= STRING(T). {
-	type_ = init_impl_type(T->type, T->text);
-	free(T);
-}
-impl_type(type_) ::= ARRAY(T). {
+impl_type(type_) ::= impl_type_token(T). {
 	type_ = init_impl_type(T->type, T->text);
 	free(T);
 }
 
+%type reference {char}
+reference(r) ::= . {r = 0;}
+reference(r) ::= AMPERSAND. {r = 1;}
+
+%type indirection {unsigned}
+indirection(i) ::= . {i = 0;}
+indirection(i) ::= pointers(p). {i = p;}
+
 %type pointers {unsigned}
-pointers(p) ::= POINTER. {++p;}
-pointers(p) ::= pointers(P) POINTER. {p = P+1;}
+pointers(p) ::= ASTERISK. {p = 1;}
+pointers(p) ::= pointers(P) ASTERISK. {p = P+1;}