280 lines
6 KiB
Plaintext
280 lines
6 KiB
Plaintext
/*
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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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/* O V E R A L L S T R U C T U R E */
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/* $Id$ */
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{
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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 <stb.h>
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#include "dbsymtab.h"
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#include "strict3rd.h"
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#include "main.h"
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#include "idf.h"
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#include "LLlex.h"
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#include "scope.h"
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#include "def.h"
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#include "type.h"
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#include "node.h"
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#include "f_info.h"
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#include "warning.h"
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#include "misc.h"
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extern t_def *GetDefinitionModule();
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}
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/*
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The grammar as given by Wirth is already almost LL(1); the
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main problem is that the full form of a qualified designator
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may be:
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[ module_ident '.' ]* IDENT [ '.' field_ident ]*
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which is quite confusing to an LL(1) parser. Rather than
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resorting to context-sensitive techniques, I have decided
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to render this as:
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IDENT [ '.' IDENT ]*
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on the grounds that it is quite natural to consider the first
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IDENT to be the name of the object and regard the others as
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field identifiers.
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*/
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%lexical LLlex;
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%start CompUnit, CompilationUnit;
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%start DefModule, DefinitionModule;
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ModuleDeclaration
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{
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register t_def *df;
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t_node *exportlist;
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int qualified;
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} :
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MODULE IDENT { df = DefineLocalModule(dot.TOK_IDF); }
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priority(&(df->mod_priority))
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';'
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import(1)*
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export(&qualified, &exportlist)
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block(&(df->mod_body))
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IDENT { EnterExportList(exportlist, qualified);
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close_scope(SC_CHKFORW|SC_CHKPROC|SC_REVERSE);
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match_id(df->df_idf, dot.TOK_IDF);
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}
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;
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priority(register t_node **prio;):
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[
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'[' ConstExpression(prio) ']'
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{ if (! ((*prio)->nd_type->tp_fund & T_CARDINAL)) {
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node_error(*prio, "illegal priority");
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}
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}
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]
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;
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export(int *QUALflag; t_node **ExportList;):
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{ *ExportList = 0; *QUALflag = D_EXPORTED; }
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[
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EXPORT
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[
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QUALIFIED
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{ *QUALflag = D_QEXPORTED; }
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]
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IdentList(ExportList) ';'
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]
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;
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import(int local;)
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{
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t_node *ImportList;
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register t_node *FromId = 0;
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register t_def *df;
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} :
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/*
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When parsing a global module, this is the place where we must
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read already compiled definition modules.
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If the FROM clause is present, the identifier in it is a module
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name, otherwise the names in the import list are module names.
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*/
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[ FROM
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IDENT
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%substart DefinitionModule;
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{ FromId = dot2leaf(Name);
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if (local) {
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df = lookfor(FromId,enclosing(CurrVis),0,D_USED);
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}
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else df = GetDefinitionModule(dot.TOK_IDF, 1);
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}
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]?
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IMPORT IdentList(&ImportList) ';'
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%substart DefinitionModule;
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{ if (FromId) {
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EnterFromImportList(ImportList, df, FromId);
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}
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else {
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EnterImportList(ImportList,
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local,
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enclosing(CurrVis)->sc_scope);
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}
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FreeNode(ImportList);
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}
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;
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DefinitionModule
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{
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register t_def *df;
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t_node *exportlist;
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int dummy;
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extern t_idf *DefId;
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extern int ForeignFlag;
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extern char *sprint();
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register t_scope *currscope = CurrentScope;
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char buf[512];
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} :
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DEFINITION
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MODULE IDENT { df = define(dot.TOK_IDF, GlobalScope, D_MODULE);
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df->df_flags |= D_BUSY | ForeignFlag;
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currscope->sc_definedby = df;
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if (DefId &&
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df->df_idf != DefId &&
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!is_anon_idf(df->df_idf)) {
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error("DEFINITION MODULE name is \"%s\", not \"%s\"",
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df->df_idf->id_text, DefId->id_text);
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}
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sprint(buf, "_%s_", df->df_idf->id_text);
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currscope->sc_name = Salloc(buf, (unsigned) strlen(buf) + 1);
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df->mod_vis = CurrVis;
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df->df_type = standard_type(T_RECORD, 1, (arith) 1);
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df->df_type->rec_scope = currscope;
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DefinitionModule++;
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if (!Defined) {
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Defined = df;
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}
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}
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';'
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import(0)*
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export(&dummy, &exportlist)
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/* New Modula-2 does not have export lists in definition
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modules. Issue a warning.
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*/
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{
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if (exportlist) {
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#ifndef STRICT_3RD_ED
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if (! options['3'])
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node_warning(exportlist, W_OLDFASHIONED, "export list in definition module ignored");
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else
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#endif
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error("export list not allowed in definition module");
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FreeNode(exportlist);
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}
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}
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definition* END IDENT
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{ end_definition_list(&(currscope->sc_def));
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DefinitionModule--;
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match_id(dot.TOK_IDF, df->df_idf);
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df->df_flags &= ~D_BUSY;
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}
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'.'
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;
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definition
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{
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register t_def *df;
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t_def *dummy;
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} :
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CONST [ %persistent ConstantDeclaration ';' ]*
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TYPE
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[ %persistent
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IDENT { df = define(dot.TOK_IDF, CurrentScope, D_TYPE); }
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[ '=' type(&(df->df_type))
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{ SolveForwardTypeRefs(df); }
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| /* empty */
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/*
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Here, the exported type has a hidden implementation.
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The export is said to be opaque.
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It is restricted to pointer types.
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*/
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{ df->df_kind = D_HIDDEN;
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df->df_type = construct_type(T_HIDDEN, NULLTYPE);
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}
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]
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{
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#ifdef DBSYMTAB
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if (options['g']) stb_string(df, D_TYPE);
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#endif
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}
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';'
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]*
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VAR [ %persistent VariableDeclaration ';' ]*
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ProcedureHeading(&dummy, D_PROCHEAD) ';'
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;
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ProgramModule
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{
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register t_def *df;
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} :
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MODULE
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IDENT
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%substart DefinitionModule;
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{
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if (state == IMPLEMENTATION) {
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int len = strlen(dot.TOK_IDF->id_text);
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if (len > 10) len = 10;
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if (strncmp(FileName, dot.TOK_IDF->id_text, len)) {
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warning(W_ORDINARY, "modulename %s does not match filename %s", dot.TOK_IDF->id_text, FileName);
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}
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df = GetDefinitionModule(dot.TOK_IDF, 0);
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CurrVis = df->mod_vis;
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}
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else {
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Defined = df = define(dot.TOK_IDF, GlobalScope, D_MODULE);
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open_scope(CLOSEDSCOPE);
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df->mod_vis = CurrVis;
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CurrentScope->sc_name = "__M2M_";
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CurrentScope->sc_definedby = df;
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}
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}
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priority(&(df->mod_priority))
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';' import(0)*
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block(&(df->mod_body)) IDENT
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{
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close_scope(SC_CHKFORW|SC_CHKPROC|SC_REVERSE);
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match_id(df->df_idf, dot.TOK_IDF);
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}
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'.'
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;
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CompilationUnit:
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{ error("Compiling a definition module");
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open_scope(CLOSEDSCOPE);
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state = DEFINITION;
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}
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DefinitionModule
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{ close_scope(SC_CHKFORW); }
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| %default
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[
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IMPLEMENTATION
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{ state = IMPLEMENTATION; }
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/* empty */
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{ state = PROGRAM; }
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]
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ProgramModule
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;
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