diff --git a/oberon.c b/oberon.c
index 0aa8d45bf1304f6a95fe211480359d30afa7c9ef..f4a711f5da3156912e43afb4bc8887dd076936a3 100644 (file)
--- a/oberon.c
+++ b/oberon.c
#include <stdarg.h>
#include <ctype.h>
#include <string.h>
+#include <assert.h>
#include "oberon.h"
#include "generator.h"
MOD,
AND,
NOT,
- PROCEDURE
+ PROCEDURE,
+ COMMA,
+ RETURN,
+ CONST,
+ TYPE,
+ ARRAY,
+ OF,
+ LBRACE,
+ RBRACE,
+ RECORD,
+ POINTER,
+ TO
};
// =======================================================================
exit(1);
}
+static oberon_type_t *
+oberon_new_type_ptr(int class)
+{
+ oberon_type_t * x = malloc(sizeof *x);
+ memset(x, 0, sizeof *x);
+ x -> class = class;
+ return x;
+}
+
+static oberon_type_t *
+oberon_new_type_integer(int size)
+{
+ oberon_type_t * x;
+ x = oberon_new_type_ptr(OBERON_TYPE_INTEGER);
+ x -> size = size;
+ return x;
+}
+
+static oberon_type_t *
+oberon_new_type_boolean(int size)
+{
+ oberon_type_t * x;
+ x = oberon_new_type_ptr(OBERON_TYPE_BOOLEAN);
+ x -> size = size;
+ return x;
+}
+
// =======================================================================
// TABLE
// =======================================================================
return newvar;
}
+static void
+oberon_define_field(oberon_context_t * ctx, oberon_type_t * rec, char * name, oberon_type_t * type)
+{
+ oberon_object_t * x = rec -> decl;
+ while(x -> next && strcmp(x -> next -> name, name) != 0)
+ {
+ x = x -> next;
+ }
+
+ if(x -> next)
+ {
+ oberon_error(ctx, "multiple definition");
+ }
+
+ oberon_object_t * field = malloc(sizeof *field);
+ memset(field, 0, sizeof *field);
+ field -> name = name;
+ field -> class = OBERON_CLASS_FIELD;
+ field -> type = type;
+
+ rec -> num_decl += 1;
+ x -> next = field;
+}
+
static oberon_object_t *
oberon_find_object_in_list(oberon_object_t * list, char * name)
{
}
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);
}
return result;
}
-static void
+static oberon_object_t *
+oberon_find_field(oberon_context_t * ctx, oberon_type_t * rec, char * name)
+{
+ oberon_object_t * x = rec -> decl;
+ for(int i = 0; i < rec -> num_decl; i++)
+ {
+ if(strcmp(x -> name, name) == 0)
+ {
+ return x;
+ }
+ x = x -> next;
+ }
+
+ oberon_error(ctx, "field not defined");
+
+ return NULL;
+}
+
+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)
{
return x -> type;
}
+*/
-static void
-oberon_define_var(oberon_scope_t * scope, char * name, oberon_type_t * 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, OBERON_CLASS_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_define_proc(oberon_scope_t * scope, char * name)
+oberon_define_proc(oberon_scope_t * scope, char * name, oberon_type_t * signature)
{
oberon_object_t * proc;
proc = oberon_define_object(scope, name, OBERON_CLASS_PROC);
- oberon_generator_init_proc(scope -> ctx, proc);
+ proc -> type = signature;
return proc;
}
{
ctx -> token = PROCEDURE;
}
+ else if(strcmp(ident, "RETURN") == 0)
+ {
+ ctx -> token = RETURN;
+ }
+ else if(strcmp(ident, "CONST") == 0)
+ {
+ ctx -> token = CONST;
+ }
+ else if(strcmp(ident, "TYPE") == 0)
+ {
+ ctx -> token = TYPE;
+ }
+ else if(strcmp(ident, "ARRAY") == 0)
+ {
+ ctx -> token = ARRAY;
+ }
+ else if(strcmp(ident, "OF") == 0)
+ {
+ 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;
+ }
}
static void
ctx -> token = NOT;
oberon_get_char(ctx);
break;
+ case ',':
+ ctx -> token = COMMA;
+ oberon_get_char(ctx);
+ break;
+ case '[':
+ ctx -> token = LBRACE;
+ oberon_get_char(ctx);
+ break;
+ case ']':
+ ctx -> token = RBRACE;
+ 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 void oberon_type(oberon_context_t * ctx, oberon_type_t ** type);
static oberon_expr_t *
oberon_new_operator(int op, oberon_type_t * result, oberon_expr_t * left, oberon_expr_t * right)
return expr;
}
+static void
+oberon_expr_list(oberon_context_t * ctx, int * num_expr, oberon_expr_t ** first)
+{
+ oberon_expr_t * last;
+
+ *num_expr = 1;
+ *first = last = oberon_expr(ctx);
+ while(ctx -> token == COMMA)
+ {
+ oberon_assert_token(ctx, COMMA);
+ oberon_expr_t * current;
+ current = oberon_expr(ctx);
+ last -> next = current;
+ last = current;
+ *num_expr += 1;
+ }
+}
+
static oberon_expr_t *
-oberon_factor(oberon_context_t * ctx)
+oberon_autocast_to(oberon_context_t * ctx, oberon_expr_t * expr, oberon_type_t * pref)
+{
+ if(pref -> class != expr -> result -> class)
+ {
+ oberon_error(ctx, "incompatible types");
+ }
+
+
+ if(pref -> class == OBERON_TYPE_INTEGER)
+ {
+ if(expr -> result -> class > pref -> class)
+ {
+ 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");
+ }
+ }
+
+ // TODO cast
+
+ return expr;
+}
+
+static void
+oberon_autocast_call(oberon_context_t * ctx, oberon_expr_t * desig)
+{
+ if(desig -> is_item == 0)
+ {
+ oberon_error(ctx, "expected item");
+ }
+
+ if(desig -> item.mode != MODE_CALL)
+ {
+ oberon_error(ctx, "expected mode CALL");
+ }
+
+ if(desig -> item.var -> class != OBERON_CLASS_PROC)
+ {
+ oberon_error(ctx, "only procedures can be called");
+ }
+
+ oberon_type_t * fn = desig -> item.var -> type;
+ int num_args = desig -> item.num_args;
+ int num_decl = fn -> num_decl;
+
+ if(num_args < num_decl)
+ {
+ oberon_error(ctx, "too few arguments");
+ }
+ else if(num_args > num_decl)
+ {
+ oberon_error(ctx, "too many arguments");
+ }
+
+ oberon_expr_t * arg = desig -> item.args;
+ oberon_object_t * param = fn -> decl;
+ for(int i = 0; i < num_args; i++)
+ {
+ oberon_autocast_to(ctx, arg, param -> type);
+ arg = arg -> next;
+ param = param -> next;
+ }
+}
+
+#define ISEXPR(x) \
+ (((x) == PLUS) \
+ || ((x) == MINUS) \
+ || ((x) == IDENT) \
+ || ((x) == INTEGER) \
+ || ((x) == LPAREN) \
+ || ((x) == NOT) \
+ || ((x) == TRUE) \
+ || ((x) == FALSE))
+
+#define ISSELECTOR(x) \
+ (((x) == LBRACE) \
+ || ((x) == DOT))
+
+static oberon_expr_t *
+oberon_make_array_selector(oberon_context_t * ctx, oberon_expr_t * desig, int num_indexes, oberon_expr_t * indexes)
+{
+ assert(desig -> is_item == 1);
+
+ if(desig -> item.mode != MODE_VAR)
+ {
+ oberon_error(ctx, "not MODE_VAR");
+ }
+
+ int class = desig -> item.var -> class;
+ switch(class)
+ {
+ case OBERON_CLASS_VAR:
+ case OBERON_CLASS_VAR_PARAM:
+ case OBERON_CLASS_PARAM:
+ break;
+ default:
+ oberon_error(ctx, "not variable");
+ break;
+ }
+
+ oberon_type_t * type = desig -> item.var -> type;
+ if(type -> class != OBERON_TYPE_ARRAY)
+ {
+ oberon_error(ctx, "not array");
+ }
+
+// int dim = desig -> item.var -> type -> dim;
+// if(num_indexes != dim)
+// {
+// oberon_error(ctx, "dimesions not matched");
+// }
+
+ oberon_type_t * base = desig -> item.var -> type -> base;
+
+ oberon_expr_t * selector;
+ selector = oberon_new_item(MODE_INDEX, base);
+ selector -> item.parent = (oberon_item_t *) desig;
+ selector -> item.num_args = num_indexes;
+ selector -> item.args = indexes;
+
+ return selector;
+}
+
+static oberon_expr_t *
+oberon_make_record_selector(oberon_context_t * ctx, oberon_expr_t * expr, char * name)
+{
+ assert(expr -> is_item == 1);
+
+ int class = expr -> result -> class;
+ if(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);
+
+ oberon_expr_t * selector;
+ selector = oberon_new_item(MODE_FIELD, field -> type);
+ selector -> item.var = field;
+ selector -> item.parent = (oberon_item_t *) expr;
+
+ return selector;
+}
+
+static oberon_expr_t *
+oberon_designator(oberon_context_t * ctx)
{
char * name;
oberon_object_t * var;
oberon_expr_t * expr;
+ name = oberon_assert_ident(ctx);
+ var = oberon_find_object(ctx -> decl, name, 1);
+
+ switch(var -> class)
+ {
+ case OBERON_CLASS_CONST:
+ // TODO copy value
+ expr = (oberon_expr_t *) var -> value;
+ break;
+ case OBERON_CLASS_VAR:
+ case OBERON_CLASS_VAR_PARAM:
+ case OBERON_CLASS_PARAM:
+ expr = oberon_new_item(MODE_VAR, var -> type);
+ break;
+ case OBERON_CLASS_PROC:
+ expr = oberon_new_item(MODE_CALL, var -> type);
+ 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);
+ oberon_assert_token(ctx, RBRACE);
+ expr = oberon_make_array_selector(ctx, expr, num_indexes, indexes);
+ 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)
+{
+ assert(expr -> is_item == 1);
+
+ if(ctx -> token == LPAREN)
+ {
+ if(expr -> result -> class != OBERON_TYPE_PROCEDURE)
+ {
+ oberon_error(ctx, "not a procedure");
+ }
+
+ oberon_assert_token(ctx, LPAREN);
+
+ int num_args = 0;
+ oberon_expr_t * arguments = NULL;
+
+ if(ISEXPR(ctx -> token))
+ {
+ oberon_expr_list(ctx, &num_args, &arguments);
+ }
+
+ 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);
+
+ oberon_autocast_call(ctx, expr);
+ }
+
+ return expr;
+}
+
+static oberon_expr_t *
+oberon_factor(oberon_context_t * ctx)
+{
+ oberon_expr_t * expr;
+
switch(ctx -> token)
{
case IDENT:
- name = oberon_assert_ident(ctx);
- var = oberon_find_object(ctx -> decl, name);
- if(var -> class == OBERON_CLASS_VAR)
- {
- expr = oberon_new_item(MODE_VAR, var -> type);
- }
- else if(var -> class == OBERON_CLASS_PROC)
- {
- expr = oberon_new_item(MODE_CALL, var -> type);
- }
- else
- {
- oberon_error(ctx, "invalid desinator");
- }
- expr -> item.var = var;
+ expr = oberon_designator(ctx);
+ expr = oberon_opt_proc_parens(ctx, expr);
break;
case INTEGER:
expr = oberon_new_item(MODE_INTEGER, ctx -> int_type);
@@ -606,14 +981,12 @@ oberon_make_bin_op(oberon_context_t * ctx, int token, oberon_expr_t * a, oberon_
oberon_expr_t * expr;
oberon_type_t * result;
- oberon_autocast_binary_op(ctx, a -> result, b -> result, &result);
-
if(ITMAKESBOOLEAN(token))
{
if(ITUSEONLYINTEGER(token))
{
if(a -> result -> class != OBERON_TYPE_INTEGER
- && b -> result -> class != OBERON_TYPE_INTEGER)
+ || b -> result -> class != OBERON_TYPE_INTEGER)
{
oberon_error(ctx, "used only with integer types");
}
@@ -621,12 +994,14 @@ oberon_make_bin_op(oberon_context_t * ctx, int token, oberon_expr_t * a, oberon_
else if(ITUSEONLYBOOLEAN(token))
{
if(a -> result -> class != OBERON_TYPE_BOOLEAN
- && b -> result -> class != OBERON_TYPE_BOOLEAN)
+ || b -> result -> class != OBERON_TYPE_BOOLEAN)
{
oberon_error(ctx, "used only with boolean type");
}
}
+ result = ctx -> bool_type;
+
if(token == EQUAL)
{
expr = oberon_new_operator(OP_EQ, result, a, b);
@@ -666,6 +1041,8 @@ oberon_make_bin_op(oberon_context_t * ctx, int token, oberon_expr_t * a, oberon_
}
else
{
+ oberon_autocast_binary_op(ctx, a -> result, b -> result, &result);
+
if(token == PLUS)
{
expr = oberon_new_operator(OP_ADD, result, a, b);
return expr;
}
+static oberon_item_t *
+oberon_const_expr(oberon_context_t * ctx)
+{
+ oberon_expr_t * expr;
+ expr = oberon_expr(ctx);
+
+ if(expr -> is_item == 0)
+ {
+ oberon_error(ctx, "const expression are required");
+ }
+
+ return (oberon_item_t *) expr;
+}
+
// =======================================================================
// PARSER
// =======================================================================
return ident;
}
-static oberon_type_t *
-oberon_type(oberon_context_t * ctx)
-{
- char * name = oberon_assert_ident(ctx);
- oberon_type_t * type = oberon_find_type(ctx -> decl, name);
- return type;
-}
-
static void
oberon_var_decl(oberon_context_t * ctx)
{
- char * name = oberon_assert_ident(ctx);
+ char * name;
+ oberon_type_t * type;
+ type = oberon_new_type_ptr(OBERON_TYPE_VOID);
+
+ name = oberon_assert_ident(ctx);
oberon_assert_token(ctx, COLON);
- oberon_type_t * type = oberon_type(ctx);
- oberon_define_var(ctx -> decl, name, type);
+ oberon_type(ctx, &type);
+ oberon_define_var(ctx -> decl, OBERON_CLASS_VAR, name, type);
}
-static void
-oberon_make_procedure_begin(oberon_context_t * ctx, char * name)
+static oberon_object_t *
+oberon_make_param(oberon_context_t * ctx, int token, char * name, oberon_type_t * type)
{
- oberon_object_t * proc;
- proc = oberon_define_proc(ctx -> decl, name);
+ oberon_object_t * param;
- oberon_open_scope(ctx);
+ 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_error(ctx, "oberon_make_param: wat");
+ }
- oberon_generate_begin_proc(ctx, proc);
+ return param;
}
-static void
-oberon_make_procedure_end(oberon_context_t * ctx)
+static oberon_object_t *
+oberon_fp_section(oberon_context_t * ctx, int * num_decl)
{
- oberon_generate_end_proc(ctx);
+ int modifer_token = ctx -> token;
+ if(ctx -> token == VAR)
+ {
+ oberon_read_token(ctx);
+ }
- oberon_close_scope(ctx -> decl);
-}
+ char * name;
+ name = oberon_assert_ident(ctx);
-static void
+ oberon_assert_token(ctx, COLON);
+
+ oberon_type_t * type;
+ 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);
+
+ *num_decl += 1;
+ return first;
+}
+
+#define ISFPSECTION \
+ ((ctx -> token == VAR) || (ctx -> token == IDENT))
+
+static void
+oberon_formal_pars(oberon_context_t * ctx, oberon_type_t * signature)
+{
+ oberon_assert_token(ctx, LPAREN);
+
+ if(ISFPSECTION)
+ {
+ signature -> decl = oberon_fp_section(ctx, &signature -> num_decl);
+ while(ctx -> token == SEMICOLON)
+ {
+ oberon_assert_token(ctx, SEMICOLON);
+ oberon_fp_section(ctx, &signature -> num_decl);
+ }
+ }
+
+ oberon_assert_token(ctx, RPAREN);
+
+ if(ctx -> token == COLON)
+ {
+ oberon_assert_token(ctx, COLON);
+ oberon_type(ctx, &signature -> base);
+ }
+}
+
+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;
+
+ if(ctx -> token == LPAREN)
+ {
+ oberon_formal_pars(ctx, signature);
+ }
+}
+
+static void
+oberon_make_return(oberon_context_t * ctx, oberon_expr_t * expr)
+{
+ if(ctx -> result_type -> class == OBERON_TYPE_VOID)
+ {
+ if(expr != NULL)
+ {
+ oberon_error(ctx, "procedure has no result type");
+ }
+ }
+ else
+ {
+ if(expr == NULL)
+ {
+ oberon_error(ctx, "procedure requires expression on result");
+ }
+
+ oberon_autocast_to(ctx, expr, ctx -> result_type);
+ }
+
+ ctx -> has_return = 1;
+
+ oberon_generate_return(ctx, expr);
+}
+
+static void
oberon_proc_decl(oberon_context_t * ctx)
{
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;
+ signature = oberon_new_type_ptr(OBERON_TYPE_VOID);
+ oberon_opt_formal_pars(ctx, &signature);
+
+ oberon_object_t * proc;
+ proc = oberon_define_proc(this_proc_def_scope, name, signature);
+
+ ctx -> result_type = signature -> base;
+ ctx -> has_return = 0;
+
oberon_assert_token(ctx, SEMICOLON);
- oberon_make_procedure_begin(ctx, name);
+ oberon_generate_begin_proc(ctx, proc);
+
+ // TODO declarations
+
if(ctx -> token == BEGIN)
{
oberon_assert_token(ctx, BEGIN);
oberon_statement_seq(ctx);
}
- oberon_make_procedure_end(ctx);
oberon_assert_token(ctx, END);
char * name2 = oberon_assert_ident(ctx);
-
if(strcmp(name2, name) != 0)
{
oberon_error(ctx, "procedure name not matched");
}
+
+ if(signature -> base -> class == OBERON_TYPE_VOID)
+ {
+ oberon_make_return(ctx, NULL);
+ }
+
+ if(ctx -> 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_decl_seq(oberon_context_t * ctx)
+oberon_const_decl(oberon_context_t * ctx)
{
- if(ctx -> token == VAR)
+ char * name;
+ oberon_item_t * value;
+ oberon_object_t * constant;
+
+ name = oberon_assert_ident(ctx);
+ 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_item_t * size, oberon_type_t * base, oberon_type_t ** type)
+{
+ if(size -> mode != MODE_INTEGER)
{
- oberon_assert_token(ctx, VAR);
- while(ctx -> token == IDENT)
+ oberon_error(ctx, "requires integer constant");
+ }
+
+ oberon_type_t * arr;
+ arr = *type;
+ arr -> class = OBERON_TYPE_ARRAY;
+ arr -> size = size -> integer;
+ arr -> base = base;
+}
+
+static void
+oberon_field_list(oberon_context_t * ctx, oberon_type_t * rec)
+{
+ if(ctx -> token == IDENT)
+ {
+ char * name;
+ oberon_type_t * type;
+ type = oberon_new_type_ptr(OBERON_TYPE_VOID);
+
+ name = oberon_assert_ident(ctx);
+ oberon_assert_token(ctx, COLON);
+ oberon_type(ctx, &type);
+ oberon_define_field(ctx, rec, name, type);
+ }
+}
+
+static void
+oberon_qualident_type(oberon_context_t * ctx, oberon_type_t ** type)
+{
+ char * name;
+ oberon_object_t * to;
+
+ 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);
+ 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_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);
+
+ oberon_item_t * size;
+ size = oberon_const_expr(ctx);
+
+ oberon_assert_token(ctx, OF);
+
+ oberon_type_t * base;
+ base = oberon_new_type_ptr(OBERON_TYPE_VOID);
+ oberon_type(ctx, &base);
+
+ oberon_make_array_type(ctx, size, base, type);
+ }
+ else if(ctx -> token == RECORD)
+ {
+ oberon_type_t * rec;
+ rec = *type;
+ rec -> class = OBERON_TYPE_RECORD;
+ oberon_object_t * list = malloc(sizeof *list);
+ memset(list, 0, sizeof *list);
+ rec -> num_decl = 0;
+ rec -> base = NULL;
+ rec -> decl = list;
+
+ oberon_assert_token(ctx, RECORD);
+ oberon_field_list(ctx, rec);
+ while(ctx -> token == SEMICOLON)
{
- oberon_var_decl(ctx);
oberon_assert_token(ctx, SEMICOLON);
+ oberon_field_list(ctx, rec);
}
+ oberon_assert_token(ctx, END);
+
+ rec -> decl = rec -> decl -> next;
+ *type = rec;
}
+ else if(ctx -> token == POINTER)
+ {
+ oberon_assert_token(ctx, POINTER);
+ oberon_assert_token(ctx, TO);
- if(ctx -> token == PROCEDURE)
+ 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_proc_decl(ctx);
- oberon_assert_token(ctx, SEMICOLON);
+ 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_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
+oberon_type_decl(oberon_context_t * ctx)
+{
+ char * name;
+ oberon_object_t * newtype;
+ oberon_type_t * type;
+
+ name = oberon_assert_ident(ctx);
+
+ newtype = oberon_find_object(ctx -> decl, name, 0);
+ if(newtype == NULL)
+ {
+ newtype = oberon_define_object(ctx -> decl, name, OBERON_CLASS_TYPE);
+ 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");
+ }
+ }
+
+ oberon_assert_token(ctx, EQUAL);
+
+ 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:
+ 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(src -> result -> class != dst -> result -> class)
+ if(type -> class != OBERON_TYPE_RECORD)
{
- oberon_error(ctx, "incompatible assignment types");
+ return;
}
- if(dst -> result -> class == OBERON_TYPE_INTEGER)
+ int num_fields = type -> num_decl;
+ oberon_object_t * field = type -> decl;
+ for(int i = 0; i < num_fields; i++)
{
- if((dst -> result -> size) < (src -> result -> size))
+ if(field -> type -> class == OBERON_TYPE_POINTER)
{
- oberon_error(ctx, "incompatible assignment type size");
+ oberon_initialize_type(ctx, field -> type);
}
+
+ oberon_initialize_object(ctx, field);
+ field = field -> next;
}
- oberon_generate_assign(ctx, src, dst);
+ oberon_generator_init_record(ctx, type);
}
static void
-oberon_make_call(oberon_context_t * ctx, oberon_expr_t * desig)
+oberon_initialize_type(oberon_context_t * ctx, oberon_type_t * type)
{
- if(desig -> is_item == 0)
+ if(type -> class == OBERON_TYPE_VOID)
{
- oberon_error(ctx, "expected item");
+ oberon_error(ctx, "undeclarated type");
}
- if(desig -> item.mode != MODE_CALL)
+ if(type -> initialized)
{
- oberon_error(ctx, "expected mode CALL");
+ return;
}
- if(desig -> item.var -> class != OBERON_CLASS_PROC)
+ type -> initialized = 1;
+
+ if(type -> class == OBERON_TYPE_POINTER)
{
- oberon_error(ctx, "only procedures can be called");
+ if(type -> base -> class == OBERON_TYPE_RECORD)
+ {
+ oberon_generator_init_type(ctx, type -> base);
+ oberon_generator_init_type(ctx, type);
+ }
+ else
+ {
+ 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;
+ }
- // TODO check arguments
+ 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)
+{
+ printf("oberon_initialize_object: name %s class %i\n", x -> name, x -> class);
+ 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:
+ break;
+ default:
+ oberon_error(ctx, "oberon_prevent_recursive_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_decl_seq(oberon_context_t * ctx)
+{
+ if(ctx -> token == CONST)
+ {
+ oberon_assert_token(ctx, CONST);
+ while(ctx -> token == IDENT)
+ {
+ oberon_const_decl(ctx);
+ oberon_assert_token(ctx, SEMICOLON);
+ }
+ }
+
+ if(ctx -> token == TYPE)
+ {
+ oberon_assert_token(ctx, TYPE);
+ while(ctx -> token == IDENT)
+ {
+ oberon_type_decl(ctx);
+ oberon_assert_token(ctx, SEMICOLON);
+ }
+ }
+
+ if(ctx -> token == VAR)
+ {
+ oberon_assert_token(ctx, VAR);
+ while(ctx -> token == IDENT)
+ {
+ oberon_var_decl(ctx);
+ oberon_assert_token(ctx, SEMICOLON);
+ }
+ }
+
+ oberon_prevent_recursive_decl(ctx);
+ oberon_initialize_decl(ctx);
+
+ while(ctx -> token == PROCEDURE)
+ {
+ oberon_proc_decl(ctx);
+ oberon_assert_token(ctx, SEMICOLON);
+ }
+}
+
+static void
+oberon_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
+{
+ 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);
}
if(ctx -> token == IDENT)
{
- item1 = oberon_expr(ctx);
+ item1 = oberon_designator(ctx);
if(ctx -> token == ASSIGN)
{
oberon_assert_token(ctx, ASSIGN);
}
else
{
+ item1 = oberon_opt_proc_parens(ctx, item1);
oberon_make_call(ctx, item1);
}
}
+ else if(ctx -> token == RETURN)
+ {
+ oberon_assert_token(ctx, RETURN);
+ if(ISEXPR(ctx -> token))
+ {
+ oberon_expr_t * expr;
+ expr = oberon_expr(ctx);
+ oberon_make_return(ctx, expr);
+ }
+ else
+ {
+ oberon_make_return(ctx, NULL);
+ }
+ }
}
static void
// LIBRARY
// =======================================================================
-static oberon_type_t *
-oberon_new_type_ptr(int class)
-{
- oberon_type_t * x = malloc(sizeof *x);
- memset(x, 0, sizeof *x);
- x -> class = class;
- return x;
-}
-
-static oberon_type_t *
-oberon_new_type_integer(int size)
-{
- oberon_type_t * x;
- x = oberon_new_type_ptr(OBERON_TYPE_INTEGER);
- x -> size = size;
- return x;
-}
-
-static oberon_type_t *
-oberon_new_type_boolean(int size)
-{
- oberon_type_t * x;
- x = oberon_new_type_ptr(OBERON_TYPE_BOOLEAN);
- x -> size = size;
- return x;
-}
-
static void
register_default_types(oberon_context_t * ctx)
{
- ctx -> int_type = oberon_new_type_integer(sizeof(int));
- ctx -> bool_type = oberon_new_type_boolean(sizeof(int));
+ ctx -> void_type = oberon_new_type_ptr(OBERON_TYPE_VOID);
+ oberon_generator_init_type(ctx, ctx -> void_type);
+ ctx -> int_type = oberon_new_type_integer(sizeof(int));
oberon_define_type(ctx -> world_scope, "INTEGER", ctx -> int_type);
+
+ ctx -> bool_type = oberon_new_type_boolean(sizeof(int));
oberon_define_type(ctx -> world_scope, "BOOLEAN", ctx -> bool_type);
}