diff --git a/oberon.c b/oberon.c
index 65803c0d7eaf5924fdc96b42858b0eb3834c016d..b56a458a6c1e979a743c9d4139b5df3044f1cdc3 100644 (file)
--- a/oberon.c
+++ b/oberon.c
OF,
LBRACE,
RBRACE,
+ RECORD,
+ POINTER,
+ TO,
+ UPARROW,
+ NIL,
+ IMPORT
};
// =======================================================================
static oberon_scope_t *
oberon_open_scope(oberon_context_t * ctx)
{
- oberon_scope_t * scope = malloc(sizeof *scope);
- memset(scope, 0, sizeof *scope);
-
- oberon_object_t * list = malloc(sizeof *list);
- memset(list, 0, sizeof *list);
+ oberon_scope_t * scope = calloc(1, sizeof *scope);
+ oberon_object_t * list = calloc(1, sizeof *list);
scope -> ctx = ctx;
scope -> list = list;
scope -> up = ctx -> decl;
+ if(scope -> up)
+ {
+ scope -> parent = scope -> up -> parent;
+ scope -> local = scope -> up -> local;
+ }
+
ctx -> decl = scope;
return scope;
}
}
static oberon_object_t *
-oberon_define_object(oberon_scope_t * scope, char * name, int class)
+oberon_define_object(oberon_scope_t * scope, char * name, int class, int export, int read_only)
{
oberon_object_t * x = scope -> list;
while(x -> next && strcmp(x -> next -> name, name) != 0)
memset(newvar, 0, sizeof *newvar);
newvar -> name = name;
newvar -> class = class;
+ newvar -> export = export;
+ newvar -> read_only = read_only;
+ newvar -> local = scope -> local;
+ newvar -> parent = scope -> parent;
+ newvar -> module = scope -> ctx -> mod;
x -> next = newvar;
}
static oberon_object_t *
-oberon_find_object(oberon_scope_t * scope, char * name)
+oberon_find_object(oberon_scope_t * scope, char * name, int check_it)
{
oberon_object_t * result = NULL;
s = s -> up;
}
- if(result == NULL)
+ if(check_it && result == NULL)
{
oberon_error(scope -> ctx, "undefined ident %s", name);
}
}
static oberon_object_t *
-oberon_define_type(oberon_scope_t * scope, char * name, oberon_type_t * type)
-{
- oberon_object_t * id;
- id = oberon_define_object(scope, name, OBERON_CLASS_TYPE);
- id -> type = type;
- oberon_generator_init_type(scope -> ctx, type);
- return id;
-}
-
-static oberon_type_t *
-oberon_find_type(oberon_scope_t * scope, char * name)
+oberon_find_field(oberon_context_t * ctx, oberon_type_t * rec, char * name)
{
- oberon_object_t * x = oberon_find_object(scope, name);
- if(x -> class != OBERON_CLASS_TYPE)
+ oberon_object_t * x = rec -> decl;
+ for(int i = 0; i < rec -> num_decl; i++)
{
- oberon_error(scope -> ctx, "%s not a type", name);
+ if(strcmp(x -> name, name) == 0)
+ {
+ return x;
+ }
+ x = x -> next;
}
- return x -> type;
-}
-
-static oberon_object_t *
-oberon_define_var(oberon_scope_t * scope, int class, char * name, oberon_type_t * type)
-{
- oberon_object_t * var;
- var = oberon_define_object(scope, name, class);
- var -> type = type;
- oberon_generator_init_var(scope -> ctx, var);
- return var;
-}
-
-/*
-static oberon_object_t *
-oberon_find_var(oberon_scope_t * scope, char * name)
-{
- oberon_object_t * x = oberon_find_object(scope, name);
-
- if(x -> class != OBERON_CLASS_VAR)
- {
- oberon_error(scope -> ctx, "%s not a var", name);
- }
+ oberon_error(ctx, "field not defined");
- return x;
+ return NULL;
}
-*/
static oberon_object_t *
-oberon_define_proc(oberon_scope_t * scope, char * name, oberon_type_t * signature)
+oberon_define_type(oberon_scope_t * scope, char * name, oberon_type_t * type, int export)
{
- oberon_object_t * proc;
- proc = oberon_define_object(scope, name, OBERON_CLASS_PROC);
- proc -> type = signature;
- oberon_generator_init_proc(scope -> ctx, proc);
- return proc;
+ oberon_object_t * id;
+ id = oberon_define_object(scope, name, OBERON_CLASS_TYPE, export, 0);
+ id -> type = type;
+ oberon_generator_init_type(scope -> ctx, type);
+ return id;
}
// =======================================================================
{
ctx -> token = OF;
}
+ else if(strcmp(ident, "RECORD") == 0)
+ {
+ ctx -> token = RECORD;
+ }
+ else if(strcmp(ident, "POINTER") == 0)
+ {
+ ctx -> token = POINTER;
+ }
+ else if(strcmp(ident, "TO") == 0)
+ {
+ ctx -> token = TO;
+ }
+ else if(strcmp(ident, "NIL") == 0)
+ {
+ ctx -> token = NIL;
+ }
+ else if(strcmp(ident, "IMPORT") == 0)
+ {
+ ctx -> token = IMPORT;
+ }
}
static void
ctx -> token = RBRACE;
oberon_get_char(ctx);
break;
+ case '^':
+ ctx -> token = UPARROW;
+ oberon_get_char(ctx);
+ break;
default:
oberon_error(ctx, "invalid char");
break;
static oberon_expr_t * oberon_expr(oberon_context_t * ctx);
static void oberon_assert_token(oberon_context_t * ctx, int token);
static char * oberon_assert_ident(oberon_context_t * ctx);
-static oberon_type_t * oberon_type(oberon_context_t * ctx);
+static void oberon_type(oberon_context_t * ctx, oberon_type_t ** type);
+static oberon_item_t * oberon_const_expr(oberon_context_t * ctx);
static oberon_expr_t *
oberon_new_operator(int op, oberon_type_t * result, oberon_expr_t * left, oberon_expr_t * right)
@@ -515,6 +525,7 @@ oberon_new_operator(int op, oberon_type_t * result, oberon_expr_t * left, oberon
operator -> is_item = 0;
operator -> result = result;
+ operator -> read_only = 1;
operator -> op = op;
operator -> left = left;
operator -> right = right;
@@ -523,7 +534,7 @@ oberon_new_operator(int op, oberon_type_t * result, oberon_expr_t * left, oberon
}
static oberon_expr_t *
-oberon_new_item(int mode, oberon_type_t * result)
+oberon_new_item(int mode, oberon_type_t * result, int read_only)
{
oberon_item_t * item;
item = malloc(sizeof *item);
item -> is_item = 1;
item -> result = result;
+ item -> read_only = read_only;
item -> mode = mode;
return (oberon_expr_t *)item;
}
static void
-oberon_expr_list(oberon_context_t * ctx, int * num_expr, oberon_expr_t ** first)
+oberon_expr_list(oberon_context_t * ctx, int * num_expr, oberon_expr_t ** first, int const_expr)
{
oberon_expr_t * last;
@@ -581,7 +593,16 @@ oberon_expr_list(oberon_context_t * ctx, int * num_expr, oberon_expr_t ** first)
{
oberon_assert_token(ctx, COMMA);
oberon_expr_t * current;
- current = oberon_expr(ctx);
+
+ if(const_expr)
+ {
+ current = (oberon_expr_t *) oberon_const_expr(ctx);
+ }
+ else
+ {
+ current = oberon_expr(ctx);
+ }
+
last -> next = current;
last = current;
*num_expr += 1;
@@ -591,7 +612,7 @@ oberon_expr_list(oberon_context_t * ctx, int * num_expr, oberon_expr_t ** first)
static oberon_expr_t *
oberon_autocast_to(oberon_context_t * ctx, oberon_expr_t * expr, oberon_type_t * pref)
{
- if(expr -> result -> class != pref -> class)
+ if(pref -> class != expr -> result -> class)
{
oberon_error(ctx, "incompatible types");
}
@@ -603,6 +624,24 @@ oberon_autocast_to(oberon_context_t * ctx, oberon_expr_t * expr, oberon_type_t *
oberon_error(ctx, "incompatible size");
}
}
+ else if(pref -> class == OBERON_TYPE_RECORD)
+ {
+ if(expr -> result != pref)
+ {
+ printf("oberon_autocast_to: rec %p != %p\n", expr -> result, pref);
+ oberon_error(ctx, "incompatible record types");
+ }
+ }
+ else if(pref -> class == OBERON_TYPE_POINTER)
+ {
+ if(expr -> result -> base != pref -> base)
+ {
+ if(expr -> result -> base -> class != OBERON_TYPE_VOID)
+ {
+ oberon_error(ctx, "incompatible pointer types");
+ }
+ }
+ }
// TODO cast
oberon_error(ctx, "expected mode CALL");
}
- if(desig -> item.var -> class != OBERON_CLASS_PROC)
+ if(desig -> item.var -> type -> class != OBERON_TYPE_PROCEDURE)
{
oberon_error(ctx, "only procedures can be called");
}
oberon_object_t * param = fn -> decl;
for(int i = 0; i < num_args; i++)
{
+ if(param -> class == OBERON_CLASS_VAR_PARAM)
+ {
+ if(arg -> is_item)
+ {
+ switch(arg -> item.mode)
+ {
+ case MODE_VAR:
+ case MODE_INDEX:
+ case MODE_FIELD:
+ // Допустимо разыменование?
+ //case MODE_DEREF:
+ break;
+ default:
+ oberon_error(ctx, "var-parameter accept only variables");
+ break;
+ }
+ }
+ }
oberon_autocast_to(ctx, arg, param -> type);
arg = arg -> next;
param = param -> next;
}
}
+static oberon_expr_t *
+oberon_make_call_func(oberon_context_t * ctx, oberon_object_t * proc, int num_args, oberon_expr_t * list_args)
+{
+ switch(proc -> class)
+ {
+ case OBERON_CLASS_PROC:
+ if(proc -> class != OBERON_CLASS_PROC)
+ {
+ oberon_error(ctx, "not a procedure");
+ }
+ break;
+ case OBERON_CLASS_VAR:
+ case OBERON_CLASS_VAR_PARAM:
+ case OBERON_CLASS_PARAM:
+ if(proc -> type -> class != OBERON_TYPE_PROCEDURE)
+ {
+ oberon_error(ctx, "not a procedure");
+ }
+ break;
+ default:
+ oberon_error(ctx, "not a procedure");
+ break;
+ }
+
+ oberon_expr_t * call;
+
+ if(proc -> sysproc)
+ {
+ if(proc -> genfunc == NULL)
+ {
+ oberon_error(ctx, "not a function-procedure");
+ }
+
+ call = proc -> genfunc(ctx, num_args, list_args);
+ }
+ else
+ {
+ if(proc -> type -> base -> class == OBERON_TYPE_VOID)
+ {
+ oberon_error(ctx, "attempt to call procedure in expression");
+ }
+
+ call = oberon_new_item(MODE_CALL, proc -> type -> base, 1);
+ call -> item.var = proc;
+ call -> item.num_args = num_args;
+ call -> item.args = list_args;
+ oberon_autocast_call(ctx, call);
+ }
+
+ return call;
+}
+
+static void
+oberon_make_call_proc(oberon_context_t * ctx, oberon_object_t * proc, int num_args, oberon_expr_t * list_args)
+{
+ switch(proc -> class)
+ {
+ case OBERON_CLASS_PROC:
+ if(proc -> class != OBERON_CLASS_PROC)
+ {
+ oberon_error(ctx, "not a procedure");
+ }
+ break;
+ case OBERON_CLASS_VAR:
+ case OBERON_CLASS_VAR_PARAM:
+ case OBERON_CLASS_PARAM:
+ if(proc -> type -> class != OBERON_TYPE_PROCEDURE)
+ {
+ oberon_error(ctx, "not a procedure");
+ }
+ break;
+ default:
+ oberon_error(ctx, "not a procedure");
+ break;
+ }
+
+ if(proc -> sysproc)
+ {
+ if(proc -> genproc == NULL)
+ {
+ oberon_error(ctx, "requres non-typed procedure");
+ }
+
+ proc -> genproc(ctx, num_args, list_args);
+ }
+ else
+ {
+ if(proc -> type -> base -> class != OBERON_TYPE_VOID)
+ {
+ oberon_error(ctx, "attempt to call function as non-typed procedure");
+ }
+
+ oberon_expr_t * call;
+ call = oberon_new_item(MODE_CALL, proc -> type -> base, 1);
+ call -> item.var = proc;
+ call -> item.num_args = num_args;
+ call -> item.args = list_args;
+ oberon_autocast_call(ctx, call);
+ oberon_generate_call_proc(ctx, call);
+ }
+}
+
#define ISEXPR(x) \
(((x) == PLUS) \
|| ((x) == MINUS) \
|| ((x) == TRUE) \
|| ((x) == FALSE))
+static oberon_expr_t *
+oberno_make_dereferencing(oberon_context_t * ctx, oberon_expr_t * expr)
+{
+ if(expr -> result -> class != OBERON_TYPE_POINTER)
+ {
+ oberon_error(ctx, "not a pointer");
+ }
+
+ assert(expr -> is_item);
+
+ oberon_expr_t * selector;
+ selector = oberon_new_item(MODE_DEREF, expr -> result -> base, expr -> read_only);
+ selector -> item.parent = (oberon_item_t *) expr;
+
+ return selector;
+}
+
+static oberon_expr_t *
+oberon_make_array_selector(oberon_context_t * ctx, oberon_expr_t * desig, oberon_expr_t * index)
+{
+ if(desig -> result -> class == OBERON_TYPE_POINTER)
+ {
+ desig = oberno_make_dereferencing(ctx, desig);
+ }
+
+ assert(desig -> is_item);
+
+ if(desig -> result -> class != OBERON_TYPE_ARRAY)
+ {
+ oberon_error(ctx, "not array");
+ }
+
+ oberon_type_t * base;
+ base = desig -> result -> base;
+
+ if(index -> result -> class != OBERON_TYPE_INTEGER)
+ {
+ oberon_error(ctx, "index must be integer");
+ }
+
+ // Статическая проверка границ массива
+ if(index -> is_item)
+ {
+ if(index -> item.mode == MODE_INTEGER)
+ {
+ int arr_size = desig -> result -> size;
+ int index_int = index -> item.integer;
+ if(index_int < 0 || index_int > arr_size - 1)
+ {
+ oberon_error(ctx, "not in range (dimension size 0..%i)", arr_size - 1);
+ }
+ }
+ }
+
+ oberon_expr_t * selector;
+ selector = oberon_new_item(MODE_INDEX, base, desig -> read_only);
+ selector -> item.parent = (oberon_item_t *) desig;
+ selector -> item.num_args = 1;
+ selector -> item.args = index;
+
+ return selector;
+}
+
+static oberon_expr_t *
+oberon_make_record_selector(oberon_context_t * ctx, oberon_expr_t * expr, char * name)
+{
+ if(expr -> result -> class == OBERON_TYPE_POINTER)
+ {
+ expr = oberno_make_dereferencing(ctx, expr);
+ }
+
+ assert(expr -> is_item == 1);
+
+ if(expr -> result -> class != OBERON_TYPE_RECORD)
+ {
+ oberon_error(ctx, "not record");
+ }
+
+ oberon_type_t * rec = expr -> result;
+
+ oberon_object_t * field;
+ field = oberon_find_field(ctx, rec, name);
+
+ if(field -> export == 0)
+ {
+ if(field -> module != ctx -> mod)
+ {
+ oberon_error(ctx, "field not exported");
+ }
+ }
+
+ int read_only = 0;
+ if(field -> read_only)
+ {
+ if(field -> module != ctx -> mod)
+ {
+ read_only = 1;
+ }
+ }
+
+ oberon_expr_t * selector;
+ selector = oberon_new_item(MODE_FIELD, field -> type, read_only);
+ selector -> item.var = field;
+ selector -> item.parent = (oberon_item_t *) expr;
+
+ return selector;
+}
+
+#define ISSELECTOR(x) \
+ (((x) == LBRACE) \
+ || ((x) == DOT) \
+ || ((x) == UPARROW))
+
+static oberon_object_t *
+oberon_qualident(oberon_context_t * ctx, char ** xname, int check)
+{
+ char * name;
+ oberon_object_t * x;
+
+ name = oberon_assert_ident(ctx);
+ x = oberon_find_object(ctx -> decl, name, check);
+
+ if(x != NULL)
+ {
+ if(x -> class == OBERON_CLASS_MODULE)
+ {
+ oberon_assert_token(ctx, DOT);
+ name = oberon_assert_ident(ctx);
+ /* Наличие объектов в левых модулях всегда проверяется */
+ x = oberon_find_object(x -> module -> decl, name, 1);
+
+ if(x -> export == 0)
+ {
+ oberon_error(ctx, "not exported");
+ }
+ }
+ }
+
+ if(xname)
+ {
+ *xname = name;
+ }
+
+ return x;
+}
+
static oberon_expr_t *
oberon_designator(oberon_context_t * ctx)
{
oberon_object_t * var;
oberon_expr_t * expr;
- name = oberon_assert_ident(ctx);
- var = oberon_find_object(ctx -> decl, name);
+ var = oberon_qualident(ctx, NULL, 1);
+
+ int read_only = 0;
+ if(var -> read_only)
+ {
+ if(var -> module != ctx -> mod)
+ {
+ read_only = 1;
+ }
+ }
switch(var -> class)
{
case OBERON_CLASS_VAR:
case OBERON_CLASS_VAR_PARAM:
case OBERON_CLASS_PARAM:
- expr = oberon_new_item(MODE_VAR, var -> type);
+ expr = oberon_new_item(MODE_VAR, var -> type, read_only);
break;
case OBERON_CLASS_PROC:
- expr = oberon_new_item(MODE_CALL, var -> type);
+ expr = oberon_new_item(MODE_VAR, var -> type, 1);
break;
default:
oberon_error(ctx, "invalid designator");
break;
}
-
expr -> item.var = var;
+
+ while(ISSELECTOR(ctx -> token))
+ {
+ switch(ctx -> token)
+ {
+ case DOT:
+ oberon_assert_token(ctx, DOT);
+ name = oberon_assert_ident(ctx);
+ expr = oberon_make_record_selector(ctx, expr, name);
+ break;
+ case LBRACE:
+ oberon_assert_token(ctx, LBRACE);
+ int num_indexes = 0;
+ oberon_expr_t * indexes = NULL;
+ oberon_expr_list(ctx, &num_indexes, &indexes, 0);
+ oberon_assert_token(ctx, RBRACE);
+
+ for(int i = 0; i < num_indexes; i++)
+ {
+ expr = oberon_make_array_selector(ctx, expr, indexes);
+ indexes = indexes -> next;
+ }
+ break;
+ case UPARROW:
+ oberon_assert_token(ctx, UPARROW);
+ expr = oberno_make_dereferencing(ctx, expr);
+ break;
+ default:
+ oberon_error(ctx, "oberon_designator: wat");
+ break;
+ }
+ }
return expr;
}
static oberon_expr_t *
-oberon_opt_proc_parens(oberon_context_t * ctx, oberon_expr_t * expr)
+oberon_opt_func_parens(oberon_context_t * ctx, oberon_expr_t * expr)
{
assert(expr -> is_item == 1);
+
+ /* Если есть скобки - значит вызов. Если нет, то передаём указатель. */
if(ctx -> token == LPAREN)
{
oberon_assert_token(ctx, LPAREN);
if(ISEXPR(ctx -> token))
{
- oberon_expr_list(ctx, &num_args, &arguments);
+ oberon_expr_list(ctx, &num_args, &arguments, 0);
}
- expr -> result = expr -> item.var -> type -> base;
- expr -> item.mode = MODE_CALL;
- expr -> item.num_args = num_args;
- expr -> item.args = arguments;
- oberon_assert_token(ctx, RPAREN);
+ expr = oberon_make_call_func(ctx, expr -> item.var, num_args, arguments);
- oberon_autocast_call(ctx, expr);
+ oberon_assert_token(ctx, RPAREN);
}
return expr;
}
+static void
+oberon_opt_proc_parens(oberon_context_t * ctx, oberon_expr_t * expr)
+{
+ assert(expr -> is_item == 1);
+
+ int num_args = 0;
+ oberon_expr_t * arguments = NULL;
+
+ if(ctx -> token == LPAREN)
+ {
+ oberon_assert_token(ctx, LPAREN);
+
+ if(ISEXPR(ctx -> token))
+ {
+ oberon_expr_list(ctx, &num_args, &arguments, 0);
+ }
+
+ oberon_assert_token(ctx, RPAREN);
+ }
+
+ /* Вызов происходит даже без скобок */
+ oberon_make_call_proc(ctx, expr -> item.var, num_args, arguments);
+}
+
static oberon_expr_t *
oberon_factor(oberon_context_t * ctx)
{
{
case IDENT:
expr = oberon_designator(ctx);
- expr = oberon_opt_proc_parens(ctx, expr);
+ expr = oberon_opt_func_parens(ctx, expr);
break;
case INTEGER:
- expr = oberon_new_item(MODE_INTEGER, ctx -> int_type);
+ expr = oberon_new_item(MODE_INTEGER, ctx -> int_type, 1);
expr -> item.integer = ctx -> integer;
oberon_assert_token(ctx, INTEGER);
break;
case TRUE:
- expr = oberon_new_item(MODE_BOOLEAN, ctx -> bool_type);
+ expr = oberon_new_item(MODE_BOOLEAN, ctx -> bool_type, 1);
expr -> item.boolean = 1;
oberon_assert_token(ctx, TRUE);
break;
case FALSE:
- expr = oberon_new_item(MODE_BOOLEAN, ctx -> bool_type);
+ expr = oberon_new_item(MODE_BOOLEAN, ctx -> bool_type, 1);
expr -> item.boolean = 0;
oberon_assert_token(ctx, FALSE);
break;
expr = oberon_factor(ctx);
expr = oberon_make_unary_op(ctx, NOT, expr);
break;
+ case NIL:
+ oberon_assert_token(ctx, NIL);
+ expr = oberon_new_item(MODE_NIL, ctx -> void_ptr_type, 1);
+ break;
default:
oberon_error(ctx, "invalid expression");
}
// PARSER
// =======================================================================
+static void oberon_decl_seq(oberon_context_t * ctx);
static void oberon_statement_seq(oberon_context_t * ctx);
+static void oberon_initialize_decl(oberon_context_t * ctx);
static void
oberon_expect_token(oberon_context_t * ctx, int token)
return ident;
}
-static oberon_type_t *
-oberon_make_array_type(oberon_context_t * ctx, int dim, oberon_item_t * size, oberon_type_t * base)
+static void
+oberon_def(oberon_context_t * ctx, int * export, int * read_only)
{
- assert(dim == 1);
- oberon_type_t * newtype;
-
- if(size -> mode != MODE_INTEGER)
+ switch(ctx -> token)
{
- oberon_error(ctx, "requires integer constant");
+ case STAR:
+ oberon_assert_token(ctx, STAR);
+ *export = 1;
+ *read_only = 0;
+ break;
+ case MINUS:
+ oberon_assert_token(ctx, MINUS);
+ *export = 1;
+ *read_only = 1;
+ break;
+ default:
+ *export = 0;
+ *read_only = 0;
+ break;
}
-
- newtype = oberon_new_type_ptr(OBERON_TYPE_ARRAY);
- newtype -> dim = dim;
- newtype -> size = size -> integer;
- newtype -> base = base;
- oberon_generator_init_type(ctx, newtype);
-
- return newtype;
}
-static oberon_type_t *
-oberon_type(oberon_context_t * ctx)
+static oberon_object_t *
+oberon_ident_def(oberon_context_t * ctx, int class)
{
- oberon_type_t * type;
+ char * name;
+ int export;
+ int read_only;
+ oberon_object_t * x;
- if(ctx -> token == IDENT)
- {
- char * name = oberon_assert_ident(ctx);
- type = oberon_find_type(ctx -> decl, name);
- }
- else if(ctx -> token == ARRAY)
- {
- oberon_assert_token(ctx, ARRAY);
- oberon_item_t * size = oberon_const_expr(ctx);
- oberon_assert_token(ctx, OF);
- oberon_type_t * base = oberon_type(ctx);
- type = oberon_make_array_type(ctx, 1, size, base);
- }
- else
- {
- oberon_error(ctx, "invalid type declaration");
- }
+ name = oberon_assert_ident(ctx);
+ oberon_def(ctx, &export, &read_only);
- return type;
+ x = oberon_define_object(ctx -> decl, name, class, export, read_only);
+ return x;
}
static void
-oberon_var_decl(oberon_context_t * ctx)
+oberon_ident_list(oberon_context_t * ctx, int class, int * num, oberon_object_t ** list)
{
- char * name = oberon_assert_ident(ctx);
- oberon_assert_token(ctx, COLON);
- oberon_type_t * type = oberon_type(ctx);
- oberon_define_var(ctx -> decl, OBERON_CLASS_VAR, name, type);
+ *num = 1;
+ *list = oberon_ident_def(ctx, class);
+ while(ctx -> token == COMMA)
+ {
+ oberon_assert_token(ctx, COMMA);
+ oberon_ident_def(ctx, class);
+ *num += 1;
+ }
}
-static oberon_object_t *
-oberon_make_param(oberon_context_t * ctx, int token, char * name, oberon_type_t * type)
+static void
+oberon_var_decl(oberon_context_t * ctx)
{
- oberon_object_t * param;
+ int num;
+ oberon_object_t * list;
+ oberon_type_t * type;
+ type = oberon_new_type_ptr(OBERON_TYPE_VOID);
- if(token == VAR)
- {
- param = oberon_define_var(ctx -> decl, OBERON_CLASS_VAR_PARAM, name, type);
- }
- else if(token == IDENT)
- {
- param = oberon_define_var(ctx -> decl, OBERON_CLASS_PARAM, name, type);
- }
- else
+ oberon_ident_list(ctx, OBERON_CLASS_VAR, &num, &list);
+ oberon_assert_token(ctx, COLON);
+ oberon_type(ctx, &type);
+
+ oberon_object_t * var = list;
+ for(int i = 0; i < num; i++)
{
- oberon_error(ctx, "oberon_make_param: wat");
+ var -> type = type;
+ var = var -> next;
}
-
- return param;
}
static oberon_object_t *
oberon_fp_section(oberon_context_t * ctx, int * num_decl)
{
- int modifer_token = ctx -> token;
+ int class = OBERON_CLASS_PARAM;
if(ctx -> token == VAR)
{
oberon_read_token(ctx);
+ class = OBERON_CLASS_VAR_PARAM;
}
- char * name;
- name = oberon_assert_ident(ctx);
+ int num;
+ oberon_object_t * list;
+ oberon_ident_list(ctx, class, &num, &list);
oberon_assert_token(ctx, COLON);
oberon_type_t * type;
- type = oberon_type(ctx);
+ type = oberon_new_type_ptr(OBERON_TYPE_VOID);
+ oberon_type(ctx, &type);
- oberon_object_t * first;
- first = oberon_make_param(ctx, modifer_token, name, type);
+ oberon_object_t * param = list;
+ for(int i = 0; i < num; i++)
+ {
+ param -> type = type;
+ param = param -> next;
+ }
- *num_decl += 1;
- return first;
+ *num_decl += num;
+ return list;
}
#define ISFPSECTION \
((ctx -> token == VAR) || (ctx -> token == IDENT))
-static oberon_type_t *
-oberon_formal_pars(oberon_context_t * ctx)
+static void
+oberon_formal_pars(oberon_context_t * ctx, oberon_type_t * signature)
{
- oberon_type_t * tp;
- tp = oberon_new_type_ptr(OBERON_TYPE_PROCEDURE);
- tp -> num_decl = 0;
- tp -> base = ctx -> void_type;
- tp -> decl = NULL;
-
oberon_assert_token(ctx, LPAREN);
if(ISFPSECTION)
{
- tp -> decl = oberon_fp_section(ctx, &tp -> num_decl);
+ signature -> decl = oberon_fp_section(ctx, &signature -> num_decl);
while(ctx -> token == SEMICOLON)
{
oberon_assert_token(ctx, SEMICOLON);
- oberon_fp_section(ctx, &tp -> num_decl);
+ oberon_fp_section(ctx, &signature -> num_decl);
}
}
if(ctx -> token == COLON)
{
oberon_assert_token(ctx, COLON);
- tp -> base = oberon_type(ctx);
+
+ oberon_object_t * typeobj;
+ typeobj = oberon_qualident(ctx, NULL, 1);
+ if(typeobj -> class != OBERON_CLASS_TYPE)
+ {
+ oberon_error(ctx, "function result is not type");
+ }
+ signature -> base = typeobj -> type;
}
+}
+
+static void
+oberon_opt_formal_pars(oberon_context_t * ctx, oberon_type_t ** type)
+{
+ oberon_type_t * signature;
+ signature = *type;
+ signature -> class = OBERON_TYPE_PROCEDURE;
+ signature -> num_decl = 0;
+ signature -> base = ctx -> void_type;
+ signature -> decl = NULL;
- oberon_generator_init_type(ctx, tp);
- return tp;
+ if(ctx -> token == LPAREN)
+ {
+ oberon_formal_pars(ctx, signature);
+ }
+}
+
+static void
+oberon_compare_signatures(oberon_context_t * ctx, oberon_type_t * a, oberon_type_t * b)
+{
+ if(a -> num_decl != b -> num_decl)
+ {
+ oberon_error(ctx, "number parameters not matched");
+ }
+
+ int num_param = a -> num_decl;
+ oberon_object_t * param_a = a -> decl;
+ oberon_object_t * param_b = b -> decl;
+ for(int i = 0; i < num_param; i++)
+ {
+ if(strcmp(param_a -> name, param_b -> name) != 0)
+ {
+ oberon_error(ctx, "param %i name not matched", i + 1);
+ }
+
+ if(param_a -> type != param_b -> type)
+ {
+ oberon_error(ctx, "param %i type not matched", i + 1);
+ }
+
+ param_a = param_a -> next;
+ param_b = param_b -> next;
+ }
}
static void
oberon_make_return(oberon_context_t * ctx, oberon_expr_t * expr)
{
- if(ctx -> result_type -> class == OBERON_TYPE_VOID)
+ oberon_object_t * proc = ctx -> decl -> parent;
+ oberon_type_t * result_type = proc -> type -> base;
+
+ if(result_type -> class == OBERON_TYPE_VOID)
{
if(expr != NULL)
{
oberon_error(ctx, "procedure requires expression on result");
}
- oberon_autocast_to(ctx, expr, ctx -> result_type);
+ oberon_autocast_to(ctx, expr, result_type);
}
- ctx -> has_return = 1;
+ proc -> has_return = 1;
oberon_generate_return(ctx, expr);
}
static void
-oberon_proc_decl(oberon_context_t * ctx)
+oberon_proc_decl_body(oberon_context_t * ctx, oberon_object_t * proc)
{
- oberon_assert_token(ctx, PROCEDURE);
-
- char * name;
- name = oberon_assert_ident(ctx);
-
- oberon_scope_t * this_proc_def_scope = ctx -> decl;
- oberon_open_scope(ctx);
-
- oberon_type_t * signature;
- if(ctx -> token == LPAREN)
- {
- signature = oberon_formal_pars(ctx);
- }
- else
- {
- signature = oberon_new_type_ptr(OBERON_TYPE_PROCEDURE);
- signature -> num_decl = 0;
- signature -> base = ctx -> void_type;
- signature -> decl = NULL;
- oberon_generator_init_type(ctx, signature);
- }
-
- oberon_object_t * proc;
- proc = oberon_define_proc(this_proc_def_scope, name, signature);
+ oberon_assert_token(ctx, SEMICOLON);
- ctx -> result_type = signature -> base;
- ctx -> has_return = 0;
+ ctx -> decl = proc -> scope;
- oberon_assert_token(ctx, SEMICOLON);
+ oberon_decl_seq(ctx);
oberon_generate_begin_proc(ctx, proc);
- // TODO declarations
-
if(ctx -> token == BEGIN)
{
oberon_assert_token(ctx, BEGIN);
}
oberon_assert_token(ctx, END);
- char * name2 = oberon_assert_ident(ctx);
- if(strcmp(name2, name) != 0)
+ char * name = oberon_assert_ident(ctx);
+ if(strcmp(name, proc -> name) != 0)
{
oberon_error(ctx, "procedure name not matched");
}
- if(signature -> base -> class == OBERON_TYPE_VOID)
+ if(proc -> type -> base -> class == OBERON_TYPE_VOID
+ && proc -> has_return == 0)
{
oberon_make_return(ctx, NULL);
}
- if(ctx -> has_return == 0)
+ if(proc -> has_return == 0)
{
oberon_error(ctx, "procedure requires return");
}
- ctx -> result_type = NULL;
oberon_generate_end_proc(ctx);
oberon_close_scope(ctx -> decl);
}
static void
-oberon_const_decl(oberon_context_t * ctx)
+oberon_proc_decl(oberon_context_t * ctx)
{
+ oberon_assert_token(ctx, PROCEDURE);
+
+ int forward = 0;
+ if(ctx -> token == UPARROW)
+ {
+ oberon_assert_token(ctx, UPARROW);
+ forward = 1;
+ }
+
char * name;
+ int export;
+ int read_only;
+ name = oberon_assert_ident(ctx);
+ oberon_def(ctx, &export, &read_only);
+
+ oberon_scope_t * proc_scope;
+ proc_scope = oberon_open_scope(ctx);
+ ctx -> decl -> local = 1;
+
+ oberon_type_t * signature;
+ signature = oberon_new_type_ptr(OBERON_TYPE_VOID);
+ oberon_opt_formal_pars(ctx, &signature);
+
+ oberon_initialize_decl(ctx);
+ oberon_generator_init_type(ctx, signature);
+ oberon_close_scope(ctx -> decl);
+
+ oberon_object_t * proc;
+ proc = oberon_find_object(ctx -> decl, name, 0);
+ if(proc != NULL)
+ {
+ if(proc -> class != OBERON_CLASS_PROC)
+ {
+ oberon_error(ctx, "mult definition");
+ }
+
+ if(forward == 0)
+ {
+ if(proc -> linked)
+ {
+ oberon_error(ctx, "mult procedure definition");
+ }
+ }
+
+ if(proc -> export != export || proc -> read_only != read_only)
+ {
+ oberon_error(ctx, "export type not matched");
+ }
+
+ oberon_compare_signatures(ctx, proc -> type, signature);
+ }
+ else
+ {
+ proc = oberon_define_object(ctx -> decl, name, OBERON_CLASS_PROC, export, read_only);
+ proc -> type = signature;
+ proc -> scope = proc_scope;
+ oberon_generator_init_proc(ctx, proc);
+ }
+
+ proc -> scope -> parent = proc;
+
+ if(forward == 0)
+ {
+ proc -> linked = 1;
+ oberon_proc_decl_body(ctx, proc);
+ }
+}
+
+static void
+oberon_const_decl(oberon_context_t * ctx)
+{
oberon_item_t * value;
oberon_object_t * constant;
- name = oberon_assert_ident(ctx);
+ constant = oberon_ident_def(ctx, OBERON_CLASS_CONST);
oberon_assert_token(ctx, EQUAL);
value = oberon_const_expr(ctx);
-
- constant = oberon_define_object(ctx -> decl, name, OBERON_CLASS_CONST);
constant -> value = value;
}
+static void
+oberon_make_array_type(oberon_context_t * ctx, oberon_expr_t * size, oberon_type_t * base, oberon_type_t ** type)
+{
+ if(size -> is_item == 0)
+ {
+ oberon_error(ctx, "requires constant");
+ }
+
+ if(size -> item.mode != MODE_INTEGER)
+ {
+ oberon_error(ctx, "requires integer constant");
+ }
+
+ oberon_type_t * arr;
+ arr = *type;
+ arr -> class = OBERON_TYPE_ARRAY;
+ arr -> size = size -> item.integer;
+ arr -> base = base;
+}
+
+static void
+oberon_field_list(oberon_context_t * ctx, oberon_type_t * rec)
+{
+ if(ctx -> token == IDENT)
+ {
+ int num;
+ oberon_object_t * list;
+ oberon_type_t * type;
+ type = oberon_new_type_ptr(OBERON_TYPE_VOID);
+
+ oberon_ident_list(ctx, OBERON_CLASS_FIELD, &num, &list);
+ oberon_assert_token(ctx, COLON);
+ oberon_type(ctx, &type);
+
+ oberon_object_t * field = list;
+ for(int i = 0; i < num; i++)
+ {
+ field -> type = type;
+ field = field -> next;
+ }
+
+ rec -> num_decl += num;
+ }
+}
+
+static void
+oberon_qualident_type(oberon_context_t * ctx, oberon_type_t ** type)
+{
+ char * name;
+ oberon_object_t * to;
+
+ to = oberon_qualident(ctx, &name, 0);
+
+ //name = oberon_assert_ident(ctx);
+ //to = oberon_find_object(ctx -> decl, name, 0);
+
+ if(to != NULL)
+ {
+ if(to -> class != OBERON_CLASS_TYPE)
+ {
+ oberon_error(ctx, "not a type");
+ }
+ }
+ else
+ {
+ to = oberon_define_object(ctx -> decl, name, OBERON_CLASS_TYPE, 0, 0);
+ to -> type = oberon_new_type_ptr(OBERON_TYPE_VOID);
+ }
+
+ *type = to -> type;
+}
+
+static void oberon_opt_formal_pars(oberon_context_t * ctx, oberon_type_t ** type);
+
+/*
+ * Правило граматики "type". Указатель type должен указывать на существующий объект!
+ */
+
+static void
+oberon_make_multiarray(oberon_context_t * ctx, oberon_expr_t * sizes, oberon_type_t * base, oberon_type_t ** type)
+{
+ if(sizes == NULL)
+ {
+ *type = base;
+ return;
+ }
+
+ oberon_type_t * dim;
+ dim = oberon_new_type_ptr(OBERON_TYPE_VOID);
+
+ oberon_make_multiarray(ctx, sizes -> next, base, &dim);
+
+ oberon_make_array_type(ctx, sizes, dim, type);
+}
+
+static void
+oberon_type(oberon_context_t * ctx, oberon_type_t ** type)
+{
+ if(ctx -> token == IDENT)
+ {
+ oberon_qualident_type(ctx, type);
+ }
+ else if(ctx -> token == ARRAY)
+ {
+ oberon_assert_token(ctx, ARRAY);
+
+ int num_sizes = 0;
+ oberon_expr_t * sizes;
+ oberon_expr_list(ctx, &num_sizes, &sizes, 1);
+
+ oberon_assert_token(ctx, OF);
+
+ oberon_type_t * base;
+ base = oberon_new_type_ptr(OBERON_TYPE_VOID);
+ oberon_type(ctx, &base);
+
+ oberon_make_multiarray(ctx, sizes, base, type);
+ }
+ else if(ctx -> token == RECORD)
+ {
+ oberon_type_t * rec;
+ rec = *type;
+ rec -> class = OBERON_TYPE_RECORD;
+
+ oberon_scope_t * record_scope;
+ record_scope = oberon_open_scope(ctx);
+ // TODO parent object
+ //record_scope -> parent = NULL;
+ record_scope -> local = 1;
+
+ oberon_assert_token(ctx, RECORD);
+ oberon_field_list(ctx, rec);
+ while(ctx -> token == SEMICOLON)
+ {
+ oberon_assert_token(ctx, SEMICOLON);
+ oberon_field_list(ctx, rec);
+ }
+ oberon_assert_token(ctx, END);
+
+ rec -> decl = record_scope -> list -> next;
+ oberon_close_scope(record_scope);
+
+ *type = rec;
+ }
+ else if(ctx -> token == POINTER)
+ {
+ oberon_assert_token(ctx, POINTER);
+ oberon_assert_token(ctx, TO);
+
+ oberon_type_t * base;
+ base = oberon_new_type_ptr(OBERON_TYPE_VOID);
+ oberon_type(ctx, &base);
+
+ oberon_type_t * ptr;
+ ptr = *type;
+ ptr -> class = OBERON_TYPE_POINTER;
+ ptr -> base = base;
+ }
+ else if(ctx -> token == PROCEDURE)
+ {
+ oberon_open_scope(ctx);
+ oberon_assert_token(ctx, PROCEDURE);
+ oberon_opt_formal_pars(ctx, type);
+ oberon_close_scope(ctx -> decl);
+ }
+ else
+ {
+ oberon_error(ctx, "invalid type declaration");
+ }
+}
+
static void
oberon_type_decl(oberon_context_t * ctx)
{
char * name;
oberon_object_t * newtype;
oberon_type_t * type;
+ int export;
+ int read_only;
name = oberon_assert_ident(ctx);
+ oberon_def(ctx, &export, &read_only);
+
+ newtype = oberon_find_object(ctx -> decl, name, 0);
+ if(newtype == NULL)
+ {
+ newtype = oberon_define_object(ctx -> decl, name, OBERON_CLASS_TYPE, export, read_only);
+ newtype -> type = oberon_new_type_ptr(OBERON_TYPE_VOID);
+ assert(newtype -> type);
+ }
+ else
+ {
+ if(newtype -> class != OBERON_CLASS_TYPE)
+ {
+ oberon_error(ctx, "mult definition");
+ }
+
+ if(newtype -> linked)
+ {
+ oberon_error(ctx, "mult definition - already linked");
+ }
+
+ newtype -> export = export;
+ newtype -> read_only = read_only;
+ }
+
oberon_assert_token(ctx, EQUAL);
- type = oberon_type(ctx);
- newtype = oberon_define_object(ctx -> decl, name, OBERON_CLASS_TYPE);
+ type = newtype -> type;
+ oberon_type(ctx, &type);
+
+ if(type -> class == OBERON_TYPE_VOID)
+ {
+ oberon_error(ctx, "recursive alias declaration");
+ }
+
newtype -> type = type;
+ newtype -> linked = 1;
+}
+
+static void oberon_prevent_recursive_object(oberon_context_t * ctx, oberon_object_t * x);
+static void oberon_prevent_recursive_type(oberon_context_t * ctx, oberon_type_t * type);
+
+static void
+oberon_prevent_recursive_pointer(oberon_context_t * ctx, oberon_type_t * type)
+{
+ if(type -> class != OBERON_TYPE_POINTER
+ && type -> class != OBERON_TYPE_ARRAY)
+ {
+ return;
+ }
+
+ if(type -> recursive)
+ {
+ oberon_error(ctx, "recursive pointer declaration");
+ }
+
+ if(type -> base -> class == OBERON_TYPE_POINTER)
+ {
+ oberon_error(ctx, "attempt to make pointer to pointer");
+ }
+
+ type -> recursive = 1;
+
+ oberon_prevent_recursive_pointer(ctx, type -> base);
+
+ type -> recursive = 0;
+}
+
+static void
+oberon_prevent_recursive_record(oberon_context_t * ctx, oberon_type_t * type)
+{
+ if(type -> class != OBERON_TYPE_RECORD)
+ {
+ return;
+ }
+
+ if(type -> recursive)
+ {
+ oberon_error(ctx, "recursive record declaration");
+ }
+
+ type -> recursive = 1;
+
+ int num_fields = type -> num_decl;
+ oberon_object_t * field = type -> decl;
+ for(int i = 0; i < num_fields; i++)
+ {
+ oberon_prevent_recursive_object(ctx, field);
+ field = field -> next;
+ }
+
+ type -> recursive = 0;
+}
+static void
+oberon_prevent_recursive_procedure(oberon_context_t * ctx, oberon_type_t * type)
+{
+ if(type -> class != OBERON_TYPE_PROCEDURE)
+ {
+ return;
+ }
+
+ if(type -> recursive)
+ {
+ oberon_error(ctx, "recursive procedure declaration");
+ }
+
+ type -> recursive = 1;
+
+ int num_fields = type -> num_decl;
+ oberon_object_t * field = type -> decl;
+ for(int i = 0; i < num_fields; i++)
+ {
+ oberon_prevent_recursive_object(ctx, field);
+ field = field -> next;
+ }
+
+ type -> recursive = 0;
+}
+
+static void
+oberon_prevent_recursive_array(oberon_context_t * ctx, oberon_type_t * type)
+{
+ if(type -> class != OBERON_TYPE_ARRAY)
+ {
+ return;
+ }
+
+ if(type -> recursive)
+ {
+ oberon_error(ctx, "recursive array declaration");
+ }
+
+ type -> recursive = 1;
+
+ oberon_prevent_recursive_type(ctx, type -> base);
+
+ type -> recursive = 0;
+}
+
+static void
+oberon_prevent_recursive_type(oberon_context_t * ctx, oberon_type_t * type)
+{
+ if(type -> class == OBERON_TYPE_POINTER)
+ {
+ oberon_prevent_recursive_pointer(ctx, type);
+ }
+ else if(type -> class == OBERON_TYPE_RECORD)
+ {
+ oberon_prevent_recursive_record(ctx, type);
+ }
+ else if(type -> class == OBERON_TYPE_ARRAY)
+ {
+ oberon_prevent_recursive_array(ctx, type);
+ }
+ else if(type -> class == OBERON_TYPE_PROCEDURE)
+ {
+ oberon_prevent_recursive_procedure(ctx, type);
+ }
+}
+
+static void
+oberon_prevent_recursive_object(oberon_context_t * ctx, oberon_object_t * x)
+{
+ switch(x -> class)
+ {
+ case OBERON_CLASS_VAR:
+ case OBERON_CLASS_TYPE:
+ case OBERON_CLASS_PARAM:
+ case OBERON_CLASS_VAR_PARAM:
+ case OBERON_CLASS_FIELD:
+ oberon_prevent_recursive_type(ctx, x -> type);
+ break;
+ case OBERON_CLASS_CONST:
+ case OBERON_CLASS_PROC:
+ case OBERON_CLASS_MODULE:
+ break;
+ default:
+ oberon_error(ctx, "oberon_prevent_recursive_object: wat");
+ break;
+ }
+}
+
+static void
+oberon_prevent_recursive_decl(oberon_context_t * ctx)
+{
+ oberon_object_t * x = ctx -> decl -> list -> next;
+
+ while(x)
+ {
+ oberon_prevent_recursive_object(ctx, x);
+ x = x -> next;
+ }
+}
+
+static void oberon_initialize_object(oberon_context_t * ctx, oberon_object_t * x);
+static void oberon_initialize_type(oberon_context_t * ctx, oberon_type_t * type);
+
+static void
+oberon_initialize_record_fields(oberon_context_t * ctx, oberon_type_t * type)
+{
+ if(type -> class != OBERON_TYPE_RECORD)
+ {
+ return;
+ }
+
+ int num_fields = type -> num_decl;
+ oberon_object_t * field = type -> decl;
+ for(int i = 0; i < num_fields; i++)
+ {
+ if(field -> type -> class == OBERON_TYPE_POINTER)
+ {
+ oberon_initialize_type(ctx, field -> type);
+ }
+
+ oberon_initialize_object(ctx, field);
+ field = field -> next;
+ }
+
+ oberon_generator_init_record(ctx, type);
+}
+
+static void
+oberon_initialize_type(oberon_context_t * ctx, oberon_type_t * type)
+{
+ if(type -> class == OBERON_TYPE_VOID)
+ {
+ oberon_error(ctx, "undeclarated type");
+ }
+
+ if(type -> initialized)
+ {
+ return;
+ }
+
+ type -> initialized = 1;
+
+ if(type -> class == OBERON_TYPE_POINTER)
+ {
+ oberon_initialize_type(ctx, type -> base);
+ oberon_generator_init_type(ctx, type);
+ }
+ else if(type -> class == OBERON_TYPE_ARRAY)
+ {
+ oberon_initialize_type(ctx, type -> base);
+ oberon_generator_init_type(ctx, type);
+ }
+ else if(type -> class == OBERON_TYPE_RECORD)
+ {
+ oberon_generator_init_type(ctx, type);
+ oberon_initialize_record_fields(ctx, type);
+ }
+ else if(type -> class == OBERON_TYPE_PROCEDURE)
+ {
+ int num_fields = type -> num_decl;
+ oberon_object_t * field = type -> decl;
+ for(int i = 0; i < num_fields; i++)
+ {
+ oberon_initialize_object(ctx, field);
+ field = field -> next;
+ }
+
+ oberon_generator_init_type(ctx, type);
+ }
+ else
+ {
+ oberon_generator_init_type(ctx, type);
+ }
+}
+
+static void
+oberon_initialize_object(oberon_context_t * ctx, oberon_object_t * x)
+{
+ if(x -> initialized)
+ {
+ return;
+ }
+
+ x -> initialized = 1;
+
+ switch(x -> class)
+ {
+ case OBERON_CLASS_TYPE:
+ oberon_initialize_type(ctx, x -> type);
+ break;
+ case OBERON_CLASS_VAR:
+ case OBERON_CLASS_PARAM:
+ case OBERON_CLASS_VAR_PARAM:
+ case OBERON_CLASS_FIELD:
+ oberon_initialize_type(ctx, x -> type);
+ oberon_generator_init_var(ctx, x);
+ break;
+ case OBERON_CLASS_CONST:
+ case OBERON_CLASS_PROC:
+ case OBERON_CLASS_MODULE:
+ break;
+ default:
+ oberon_error(ctx, "oberon_initialize_object: wat");
+ break;
+ }
+}
+
+static void
+oberon_initialize_decl(oberon_context_t * ctx)
+{
+ oberon_object_t * x = ctx -> decl -> list;
+
+ while(x -> next)
+ {
+ oberon_initialize_object(ctx, x -> next);
+ x = x -> next;
+ }
+}
+
+static void
+oberon_prevent_undeclarated_procedures(oberon_context_t * ctx)
+{
+ oberon_object_t * x = ctx -> decl -> list;
+
+ while(x -> next)
+ {
+ if(x -> next -> class == OBERON_CLASS_PROC)
+ {
+ if(x -> next -> linked == 0)
+ {
+ oberon_error(ctx, "unresolved forward declaration");
+ }
+ }
+ x = x -> next;
+ }
}
static void
}
}
+ oberon_prevent_recursive_decl(ctx);
+ oberon_initialize_decl(ctx);
+
while(ctx -> token == PROCEDURE)
{
oberon_proc_decl(ctx);
oberon_assert_token(ctx, SEMICOLON);
}
+
+ oberon_prevent_undeclarated_procedures(ctx);
}
static void
oberon_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
{
+ if(dst -> read_only)
+ {
+ oberon_error(ctx, "read-only destination");
+ }
+
oberon_autocast_to(ctx, src, dst -> result);
oberon_generate_assign(ctx, src, dst);
}
-static void
-oberon_make_call(oberon_context_t * ctx, oberon_expr_t * desig)
-{
- oberon_autocast_call(ctx, desig);
- oberon_generate_call_proc(ctx, desig);
-}
-
static void
oberon_statement(oberon_context_t * ctx)
{
}
else
{
- item1 = oberon_opt_proc_parens(ctx, item1);
- oberon_make_call(ctx, item1);
+ oberon_opt_proc_parens(ctx, item1);
}
}
else if(ctx -> token == RETURN)
}
}
+static void
+oberon_import_module(oberon_context_t * ctx, char * alias, char * name)
+{
+ oberon_module_t * m = ctx -> module_list;
+ while(m && strcmp(m -> name, name) != 0)
+ {
+ m = m -> next;
+ }
+
+ if(m == NULL)
+ {
+ const char * code;
+ code = ctx -> import_module(name);
+ if(code == NULL)
+ {
+ oberon_error(ctx, "no such module");
+ }
+
+ m = oberon_compile_module(ctx, code);
+ assert(m);
+ }
+
+ if(m -> ready == 0)
+ {
+ oberon_error(ctx, "cyclic module import");
+ }
+
+ oberon_object_t * ident;
+ ident = oberon_define_object(ctx -> decl, alias, OBERON_CLASS_MODULE, 0, 0);
+ ident -> module = m;
+}
+
+static void
+oberon_import_decl(oberon_context_t * ctx)
+{
+ char * alias;
+ char * name;
+
+ alias = name = oberon_assert_ident(ctx);
+ if(ctx -> token == ASSIGN)
+ {
+ oberon_assert_token(ctx, ASSIGN);
+ name = oberon_assert_ident(ctx);
+ }
+
+ oberon_import_module(ctx, alias, name);
+}
+
+static void
+oberon_import_list(oberon_context_t * ctx)
+{
+ oberon_assert_token(ctx, IMPORT);
+
+ oberon_import_decl(ctx);
+ while(ctx -> token == COMMA)
+ {
+ oberon_assert_token(ctx, COMMA);
+ oberon_import_decl(ctx);
+ }
+
+ oberon_assert_token(ctx, SEMICOLON);
+}
+
static void
oberon_parse_module(oberon_context_t * ctx)
{
- char *name1, *name2;
+ char * name1;
+ char * name2;
oberon_read_token(ctx);
oberon_assert_token(ctx, MODULE);
oberon_assert_token(ctx, SEMICOLON);
ctx -> mod -> name = name1;
+ if(ctx -> token == IMPORT)
+ {
+ oberon_import_list(ctx);
+ }
+
oberon_decl_seq(ctx);
+ oberon_generate_begin_module(ctx);
if(ctx -> token == BEGIN)
{
oberon_assert_token(ctx, BEGIN);
- oberon_generate_begin_module(ctx);
oberon_statement_seq(ctx);
- oberon_generate_end_module(ctx);
}
+ oberon_generate_end_module(ctx);
oberon_assert_token(ctx, END);
name2 = oberon_assert_ident(ctx);
ctx -> void_type = oberon_new_type_ptr(OBERON_TYPE_VOID);
oberon_generator_init_type(ctx, ctx -> void_type);
+ ctx -> void_ptr_type = oberon_new_type_ptr(OBERON_TYPE_POINTER);
+ ctx -> void_ptr_type -> base = ctx -> void_type;
+ oberon_generator_init_type(ctx, ctx -> void_ptr_type);
+
ctx -> int_type = oberon_new_type_integer(sizeof(int));
- oberon_define_type(ctx -> world_scope, "INTEGER", ctx -> int_type);
+ oberon_define_type(ctx -> world_scope, "INTEGER", ctx -> int_type, 1);
ctx -> bool_type = oberon_new_type_boolean(sizeof(int));
- oberon_define_type(ctx -> world_scope, "BOOLEAN", ctx -> bool_type);
+ oberon_define_type(ctx -> world_scope, "BOOLEAN", ctx -> bool_type, 1);
+}
+
+static void
+oberon_new_intrinsic(oberon_context_t * ctx, char * name, GenerateFuncCallback f, GenerateProcCallback p)
+{
+ oberon_object_t * proc;
+ proc = oberon_define_object(ctx -> decl, name, OBERON_CLASS_PROC, 1, 0);
+ proc -> sysproc = 1;
+ proc -> genfunc = f;
+ proc -> genproc = p;
+ proc -> type = oberon_new_type_ptr(OBERON_TYPE_PROCEDURE);
+}
+
+static oberon_expr_t *
+oberon_make_abs_call(oberon_context_t * ctx, int num_args, oberon_expr_t * list_args)
+{
+ if(num_args < 1)
+ {
+ oberon_error(ctx, "too few arguments");
+ }
+
+ if(num_args > 1)
+ {
+ oberon_error(ctx, "too mach arguments");
+ }
+
+ oberon_expr_t * arg;
+ arg = list_args;
+
+ oberon_type_t * result_type;
+ result_type = arg -> result;
+
+ if(result_type -> class != OBERON_TYPE_INTEGER)
+ {
+ oberon_error(ctx, "ABS accepts only integers");
+ }
+
+
+ oberon_expr_t * expr;
+ expr = oberon_new_operator(OP_ABS, result_type, arg, NULL);
+ return expr;
}
oberon_context_t *
-oberon_create_context()
+oberon_create_context(ModuleImportCallback import_module)
{
- oberon_context_t * ctx = malloc(sizeof *ctx);
- memset(ctx, 0, sizeof *ctx);
+ oberon_context_t * ctx = calloc(1, sizeof *ctx);
oberon_scope_t * world_scope;
world_scope = oberon_open_scope(ctx);
ctx -> world_scope = world_scope;
+ ctx -> import_module = import_module;
+
oberon_generator_init_context(ctx);
- register_default_types(ctx);
+ register_default_types(ctx);
+ oberon_new_intrinsic(ctx, "ABS", oberon_make_abs_call, NULL);
return ctx;
}
}
oberon_module_t *
-oberon_compile_module(oberon_context_t * ctx, const char * code)
+oberon_compile_module(oberon_context_t * ctx, const char * newcode)
{
- oberon_module_t * mod = malloc(sizeof *mod);
- memset(mod, 0, sizeof *mod);
- ctx -> mod = mod;
+ const char * code = ctx -> code;
+ int code_index = ctx -> code_index;
+ char c = ctx -> c;
+ int token = ctx -> token;
+ char * string = ctx -> string;
+ int integer = ctx -> integer;
+ oberon_scope_t * decl = ctx -> decl;
+ oberon_module_t * mod = ctx -> mod;
oberon_scope_t * module_scope;
module_scope = oberon_open_scope(ctx);
- mod -> decl = module_scope;
- oberon_init_scaner(ctx, code);
+ oberon_module_t * module;
+ module = calloc(1, sizeof *module);
+ module -> decl = module_scope;
+ module -> next = ctx -> module_list;
+
+ ctx -> mod = module;
+ ctx -> module_list = module;
+
+ oberon_init_scaner(ctx, newcode);
oberon_parse_module(ctx);
- oberon_generate_code(ctx);
+ module -> ready = 1;
+
+ ctx -> code = code;
+ ctx -> code_index = code_index;
+ ctx -> c = c;
+ ctx -> token = token;
+ ctx -> string = string;
+ ctx -> integer = integer;
+ ctx -> decl = decl;
+ ctx -> mod = mod;
- ctx -> mod = NULL;
- return mod;
+ return module;
}