534 lines
13 KiB
C
534 lines
13 KiB
C
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*
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* Author: Ceriel J.H. Jacobs
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*/
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/* H I G H L E V E L S Y M B O L E N T R Y */
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/* $Header$ */
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#include "debug.h"
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#include <alloc.h>
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#include <em_arith.h>
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#include <em_label.h>
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#include <em_code.h>
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#include <assert.h>
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#include "idf.h"
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#include "LLlex.h"
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#include "def.h"
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#include "type.h"
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#include "scope.h"
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#include "node.h"
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#include "main.h"
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#include "misc.h"
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#include "f_info.h"
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t_def *
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Enter(name, kind, type, pnam)
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char *name;
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t_type *type;
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{
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/* Enter a definition for "name" with kind "kind" and type
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"type" in the Current Scope. If it is a standard name, also
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put its number in the definition structure.
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*/
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register t_def *df;
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df = define(str2idf(name, 0), CurrentScope, kind);
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df->df_type = type;
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if (pnam) df->df_value.df_stdname = pnam;
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return df;
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}
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EnterType(name, type)
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char *name;
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t_type *type;
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{
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/* Enter a type definition for "name" and type
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"type" in the Current Scope.
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*/
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if (! Enter(name, D_TYPE, type, 0)) {
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assert(0);
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}
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}
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EnterEnumList(Idlist, type)
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t_node *Idlist;
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register t_type *type;
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{
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/* Put a list of enumeration literals in the symbol table.
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They all have type "type".
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Also assign numbers to them, and link them together.
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We must link them together because an enumeration type may
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be exported, in which case its literals must also be exported.
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Thus, we need an easy way to get to them.
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*/
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register t_def *df;
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register t_node *idlist = Idlist;
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type->enm_ncst = 0;
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for (; idlist; idlist = idlist->nd_left) {
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df = define(idlist->nd_IDF, CurrentScope, D_ENUM);
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df->df_type = type;
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df->enm_val = (type->enm_ncst)++;
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df->enm_next = type->enm_enums;
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type->enm_enums = df;
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}
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FreeNode(Idlist);
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}
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EnterFieldList(Idlist, type, scope, addr)
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t_node *Idlist;
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register t_type *type;
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t_scope *scope;
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arith *addr;
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{
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/* Put a list of fields in the symbol table.
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They all have type "type", and are put in scope "scope".
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Mark them as QUALIFIED EXPORT, because that's exactly what
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fields are, you can get to them by qualifying them.
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*/
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register t_def *df;
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register t_node *idlist = Idlist;
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for (; idlist; idlist = idlist->nd_left) {
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df = define(idlist->nd_IDF, scope, D_FIELD);
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df->df_type = type;
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df->df_flags |= D_QEXPORTED;
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df->fld_off = align(*addr, type->tp_align);
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*addr = df->fld_off + type->tp_size;
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}
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FreeNode(Idlist);
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}
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EnterVarList(Idlist, type, local)
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t_node *Idlist;
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t_type *type;
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{
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/* Enter a list of identifiers representing variables into the
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name list. "type" represents the type of the variables.
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"local" is set if the variables are declared local to a
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procedure.
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*/
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register t_def *df;
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register t_node *idlist = Idlist;
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register t_scopelist *sc = CurrVis;
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char buf[256];
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extern char *sprint();
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if (local) {
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/* Find the closest enclosing open scope. This
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is the procedure that we are dealing with
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*/
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while (sc->sc_scope->sc_scopeclosed) sc = enclosing(sc);
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}
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for (; idlist; idlist = idlist->nd_right) {
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df = define(idlist->nd_IDF, CurrentScope, D_VARIABLE);
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df->df_type = type;
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if (idlist->nd_left) {
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/* An address was supplied
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*/
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register t_type *tp = idlist->nd_left->nd_type;
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df->df_flags |= D_ADDRGIVEN | D_NOREG;
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if (tp != error_type && !(tp->tp_fund & T_CARDINAL)){
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node_error(idlist->nd_left,
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"illegal type for address");
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}
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df->var_off = idlist->nd_left->nd_INT;
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}
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else if (local) {
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/* subtract aligned size of variable to the offset,
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as the variable list exists only local to a
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procedure
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*/
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sc->sc_scope->sc_off =
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-WA(align(type->tp_size - sc->sc_scope->sc_off,
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type->tp_align));
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df->var_off = sc->sc_scope->sc_off;
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}
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else {
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/* Global name, possibly external
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*/
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if (sc->sc_scope->sc_definedby->df_flags & D_FOREIGN) {
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df->var_name = df->df_idf->id_text;
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}
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else {
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sprint(buf,"%s_%s", sc->sc_scope->sc_name,
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df->df_idf->id_text);
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df->var_name = Salloc(buf,
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(unsigned)(strlen(buf)+1));
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}
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df->df_flags |= D_NOREG;
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if (DefinitionModule) {
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df->df_flags |= D_USED | D_DEFINED;
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if (sc == Defined->mod_vis) {
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C_exa_dnam(df->var_name);
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}
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}
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else {
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C_ina_dnam(df->var_name);
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}
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}
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}
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FreeNode(Idlist);
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}
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EnterParamList(ppr, Idlist, type, VARp, off)
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t_param **ppr;
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t_node *Idlist;
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t_type *type;
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int VARp;
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arith *off;
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{
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/* Create (part of) a parameterlist of a procedure.
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"ids" indicates the list of identifiers, "tp" their type, and
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"VARp" indicates D_VARPAR or D_VALPAR.
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*/
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register t_param *pr;
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register t_def *df;
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register t_node *idlist = Idlist;
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t_node *dummy = 0;
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static t_param *last;
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if (! idlist) {
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/* Can only happen when a procedure type is defined */
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dummy = Idlist = idlist = dot2leaf(Name);
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}
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for ( ; idlist; idlist = idlist->nd_left) {
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pr = new_paramlist();
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pr->par_next = 0;
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if (!*ppr) *ppr = pr;
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else last->par_next = pr;
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last = pr;
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if (!DefinitionModule && idlist != dummy) {
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df = define(idlist->nd_IDF, CurrentScope, D_VARIABLE);
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df->var_off = *off;
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}
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else df = new_def();
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pr->par_def = df;
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df->df_type = type;
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df->df_flags |= (VARp | D_DEFINED);
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if (df->df_flags & D_VARPAR) df->df_flags |= D_USED;
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if (IsConformantArray(type)) {
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/* we need room for the base address and a descriptor
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*/
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*off += pointer_size + 3 * word_size;
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}
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else if (VARp == D_VARPAR) {
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*off += pointer_size;
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}
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else {
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*off += WA(type->tp_size);
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}
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}
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FreeNode(Idlist);
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}
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STATIC t_def *DoImport();
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ImportEffects(idef, scope, flag)
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register t_def *idef;
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t_scope *scope;
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{
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/* Handle side effects of an import:
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- a module could have unqualified exports ???
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- importing an enumeration type also imports literals
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*/
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register t_def *df = idef;
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register t_type *tp;
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while (df->df_kind & D_IMPORTED) {
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df = df->imp_def;
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}
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tp = BaseType(df->df_type);
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if ((df->df_kind & (D_TYPE|D_FTYPE)) &&
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tp->tp_fund == T_ENUMERATION) {
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/* Also import all enumeration literals
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*/
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for (df = tp->enm_enums; df; df = df->enm_next) {
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df->df_flags |= D_QEXPORTED;
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if (! DoImport(df, scope, flag|D_USED)) assert(0);
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/* don't complain when not used ... */
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}
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idef->df_flags |= D_USED; /* don't complain ... */
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}
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else if (df->df_kind == D_MODULE) {
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if (df->mod_vis == CurrVis) {
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error("cannot import current module \"%s\"",
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df->df_idf->id_text);
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return;
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}
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if (df->df_scope == GlobalScope) return;
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/* Also import all definitions that are exported from this
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module
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*/
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for (df = df->mod_vis->sc_scope->sc_def;
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df;
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df = df->df_nextinscope) {
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if (df->df_flags & D_EXPORTED) {
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if (!DoImport(df, scope, D_IMP_BY_EXP|D_USED)){
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assert(0);
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}
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/* don't complain when these are not used */
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}
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}
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idef->df_flags |= D_USED; /* don't complain ... */
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}
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}
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STATIC t_def *
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DoImport(df, scope, flag)
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register t_def *df;
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t_scope *scope;
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{
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/* Definition "df" is imported to scope "scope".
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*/
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register t_def *idef = define(df->df_idf, scope, D_IMPORT);
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idef->imp_def = df;
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idef->df_flags |= flag;
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ImportEffects(idef, scope, flag);
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return idef;
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}
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STATIC
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ForwModule(df, nd)
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register t_def *df;
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t_node *nd;
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{
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/* An import is done from a not yet defined module "df".
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We could also end up here for not found DEFINITION MODULES.
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Create a declaration and a scope for this module.
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*/
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register t_scopelist *vis;
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if (df->df_scope != GlobalScope) {
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df->df_scope = enclosing(CurrVis)->sc_scope;
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df->df_kind = D_FORWMODULE;
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}
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open_scope(CLOSEDSCOPE);
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vis = CurrVis; /* The new scope, but watch out, it's "sc_encl"
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field is not set right. It must indicate the
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enclosing scope, but this must be done AFTER
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closing this one
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*/
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close_scope(0);
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vis->sc_encl = enclosing(CurrVis);
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/* Here ! */
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df->for_vis = vis;
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df->for_node = nd;
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}
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STATIC t_def *
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ForwDef(ids, scope)
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register t_node *ids;
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t_scope *scope;
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{
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/* Enter a forward definition of "ids" in scope "scope",
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if it is not already defined.
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*/
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register t_def *df;
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if (!(df = lookup(ids->nd_IDF, scope, 0, 0))) {
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df = define(ids->nd_IDF, scope, D_FORWARD);
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df->for_node = MkLeaf(Name, &(ids->nd_token));
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}
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return df;
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}
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EnterExportList(Idlist, qualified)
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t_node *Idlist;
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{
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/* From the current scope, the list of identifiers "ids" is
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exported. Note this fact. If the export is not qualified, make
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all the "ids" visible in the enclosing scope by defining them
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in this scope as "imported".
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*/
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register t_node *idlist = Idlist;
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register t_def *df, *df1;
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for (;idlist; idlist = idlist->nd_left) {
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df = lookup(idlist->nd_IDF, CurrentScope, 0, 0);
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if (!df) {
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/* undefined item in export list
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*/
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node_error(idlist,
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"identifier \"%s\" not defined",
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idlist->nd_IDF->id_text);
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continue;
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}
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if (df->df_flags & (D_EXPORTED|D_QEXPORTED)) {
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node_error(idlist,
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"multiple occurrences of \"%s\" in export list",
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idlist->nd_IDF->id_text);
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continue;
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}
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df->df_flags |= qualified;
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if (qualified == D_EXPORTED) {
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/* Export, but not qualified.
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Find all imports of the module in which this export
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occurs, and export the current definition to it
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*/
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df1 = CurrentScope->sc_definedby->df_idf->id_def;
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while (df1) {
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if ((df1->df_kind & D_IMPORTED) &&
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df1->imp_def == CurrentScope->sc_definedby) {
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if (! DoImport(df, df1->df_scope, D_IMP_BY_EXP)) assert(0);
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}
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df1 = df1->df_next;
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}
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/* Also handle the definition as if the enclosing
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scope imports it.
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*/
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df1 = lookup(idlist->nd_IDF,
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enclosing(CurrVis)->sc_scope,
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D_IMPORTED,
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0);
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if (df1) {
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/* It was already defined in the enclosing
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scope. There are two legal possibilities,
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which are examined below.
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*/
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t_def *df2 = df;
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while (df2->df_kind & D_IMPORTED) {
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df2 = df2->imp_def;
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}
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if (df1->df_kind == D_PROCHEAD &&
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df2->df_kind == D_PROCEDURE) {
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df1->df_kind = D_IMPORT;
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df1->df_flags |= D_IMP_BY_EXP;
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df1->imp_def = df;
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continue;
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}
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if (df1->df_kind == D_HIDDEN &&
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(df2->df_kind & (D_TYPE|D_FTYPE))) {
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DeclareType(idlist, df1, df2->df_type);
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df1->df_kind = D_TYPE;
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continue;
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}
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}
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if (! DoImport(df,enclosing(CurrVis)->sc_scope,D_IMP_BY_EXP)) assert(0);
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}
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}
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FreeNode(Idlist);
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}
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CheckForImports(df)
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t_def *df;
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{
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/* We have a definition for "df"; check all imports of
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it for side-effects
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*/
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register t_def *df1 = df->df_idf->id_def;
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while (df1) {
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if (df1->df_kind & D_IMPORTED) {
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register t_def *df2 = df1->imp_def;
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while (df2->df_kind & D_IMPORTED) df2 = df2->imp_def;
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if (df2 == df) {
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ImportEffects(df1, df1->df_scope, 0);
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}
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}
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df1 = df1->df_next;
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}
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}
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EnterFromImportList(idlist, FromDef, FromId)
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register t_node *idlist;
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register t_def *FromDef;
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t_node *FromId;
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{
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/* Import the list Idlist from the module indicated by Fromdef.
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*/
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t_scope *sc;
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register t_def *df;
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char *module_name = FromDef->df_idf->id_text;
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switch(FromDef->df_kind) {
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case D_ERROR:
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case D_FORWARD:
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/* The module from which the import was done
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is not yet declared. I'm not sure if I must
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accept this, but for the time being I will.
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We also end up here if some definition module could not
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be found.
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???
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*/
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ForwModule(FromDef, FromId);
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/* Fall through */
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case D_FORWMODULE:
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EnterImportList(idlist, 1, FromDef->for_vis->sc_scope);
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return;
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case D_MODULE:
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sc = FromDef->mod_vis->sc_scope;
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if (sc == CurrentScope) {
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node_error(FromId, "cannot import from current module \"%s\"", module_name);
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return;
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}
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break;
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default:
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node_error(FromId,"identifier \"%s\" does not represent a module",module_name);
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return;
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}
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for (; idlist; idlist = idlist->nd_left) {
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if (! (df = lookup(idlist->nd_IDF, sc, 0, 0))) {
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if (! is_anon_idf(idlist->nd_IDF)) {
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node_error(idlist,
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"identifier \"%s\" not declared in module \"%s\"",
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idlist->nd_IDF->id_text,
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module_name);
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}
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df = define(idlist->nd_IDF,sc,D_ERROR);
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}
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else if (! (df->df_flags & (D_EXPORTED|D_QEXPORTED))) {
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node_error(idlist,
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"identifier \"%s\" not exported from module \"%s\"",
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idlist->nd_IDF->id_text,
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module_name);
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df->df_flags |= D_QEXPORTED;
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}
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if (! DoImport(df, CurrentScope, 0)) assert(0);
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}
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FreeNode(FromId);
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}
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EnterImportList(idlist, local, sc)
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register t_node *idlist;
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t_scope *sc;
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{
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/* Import "idlist" from scope "sc".
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If the import is not local, definition modules must be read
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for "idlist".
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*/
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extern t_def *GetDefinitionModule();
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struct f_info f;
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f = file_info;
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for (; idlist; idlist = idlist->nd_left) {
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if (! DoImport(local ?
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ForwDef(idlist, sc) :
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GetDefinitionModule(idlist->nd_IDF, 1),
|
|
CurrentScope, 0)) assert(0);
|
|
file_info = f;
|
|
}
|
|
}
|