285 lines
6 KiB
Plaintext
285 lines
6 KiB
Plaintext
/* O V E R A L L S T R U C T U R E */
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{
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#ifndef NORCSID
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static char *RcsId = "$Header$";
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#endif
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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 "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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static int DEFofIMPL = 0; /* Flag indicating that we are currently
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parsing the definition module of the
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implementation module currently being
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compiled
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*/
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struct def *currentdef; /* current definition of module or procedure */
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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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struct idf *id;
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register struct def *df;
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struct def *savecurr = currentdef;
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extern int proclevel;
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static int modulecount = 0;
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char buf[256];
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struct node *nd;
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struct node *exportlist = 0;
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int qualified;
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extern char *sprint(), *Malloc(), *strcpy();
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} :
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MODULE IDENT {
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id = dot.TOK_IDF;
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df = define(id, CurrentScope, D_MODULE);
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currentdef = df;
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if (!df->mod_vis) {
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open_scope(CLOSEDSCOPE);
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df->mod_vis = CurrVis;
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}
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else {
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CurrVis = df->mod_vis;
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CurrentScope->sc_level = proclevel;
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}
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df->df_type = standard_type(T_RECORD, 0, (arith) 0);
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df->df_type->rec_scope = df->mod_vis->sc_scope;
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sprint(buf, "__%d%s", ++modulecount, id->id_text);
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CurrentScope->sc_name =
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Malloc((unsigned) (strlen(buf) + 1));
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strcpy(CurrentScope->sc_name, buf);
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if (! proclevel) C_ina_dnam(&buf[1]);
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C_inp(buf);
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}
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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, 0)?
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block(&nd)
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IDENT { InitProc(nd, df);
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if (exportlist) {
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Export(exportlist, qualified, df);
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FreeNode(exportlist);
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}
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close_scope(SC_CHKFORW|SC_CHKPROC|SC_REVERSE);
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match_id(id, dot.TOK_IDF);
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currentdef = savecurr;
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}
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;
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priority(arith *pprio;)
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{
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struct node *nd;
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} :
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'[' ConstExpression(&nd) ']'
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{ if (!(nd->nd_type->tp_fund & T_INTORCARD)) {
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node_error(nd, "Illegal priority");
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}
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*pprio = nd->nd_INT;
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FreeNode(nd);
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}
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;
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export(int *QUALflag; struct node **ExportList; int def;)
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{
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} :
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EXPORT
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[
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QUALIFIED
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{ *QUALflag = 1; }
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{ *QUALflag = 0; }
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]
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IdentList(ExportList) ';'
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{
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if (def) {
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node_warning(*ExportList, "export list in definition module ignored");
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FreeNode(*ExportList);
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}
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}
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;
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import(int local;)
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{
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struct node *ImportList;
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struct node *id = 0;
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} :
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[ FROM
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IDENT { id = MkNode(Value, NULLNODE, NULLNODE, &dot); }
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]?
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IMPORT IdentList(&ImportList) ';'
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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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{
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Import(ImportList, id, local);
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}
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;
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DefinitionModule
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{
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register struct def *df;
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struct idf *id;
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struct node *exportlist;
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int dummy;
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} :
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DEFINITION
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MODULE IDENT {
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id = dot.TOK_IDF;
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df = define(id, GlobalScope, D_MODULE);
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if (!SYSTEMModule) open_scope(CLOSEDSCOPE);
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if (!Defined) Defined = df;
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df->mod_vis = CurrVis;
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CurrentScope->sc_name = id->id_text;
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df->df_type = standard_type(T_RECORD, 0, (arith) 0);
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df->df_type->rec_scope = df->mod_vis->sc_scope;
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DefinitionModule++;
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DO_DEBUG(1, debug("Definition module \"%s\" %d",
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id->id_text, DefinitionModule));
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}
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';'
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import(0)*
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export(&dummy, &exportlist, 1)?
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/* New Modula-2 does not have export lists in definition modules.
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For the time being, we ignore export lists here, and a
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warning is issued.
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*/
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definition* END IDENT
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{
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if (DEFofIMPL) {
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/* Just read the definition module of the
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implementation module being compiled
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*/
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RemImports(&(CurrentScope->sc_def));
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}
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df = CurrentScope->sc_def;
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while (df) {
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/* Make all definitions "QUALIFIED EXPORT" */
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df->df_flags |= D_QEXPORTED;
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df = df->df_nextinscope;
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}
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if (!SYSTEMModule) close_scope(SC_CHKFORW);
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DefinitionModule--;
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match_id(id, dot.TOK_IDF);
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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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struct def *df;
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} :
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CONST [ ConstantDeclaration Semicolon ]*
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TYPE
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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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| /* 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_POINTER, NULLTYPE);
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}
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]
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Semicolon
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]*
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VAR [ VariableDeclaration Semicolon ]*
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ProcedureHeading(&df, D_PROCHEAD) Semicolon
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;
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Semicolon:
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';'
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{ warning("; expected"); }
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;
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ProgramModule(int state;)
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{
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struct idf *id;
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struct def *GetDefinitionModule();
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register struct def *df;
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struct node *nd;
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} :
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MODULE
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IDENT {
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id = dot.TOK_IDF;
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if (state == IMPLEMENTATION) {
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DEFofIMPL = 1;
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df = GetDefinitionModule(id);
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currentdef = df;
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CurrVis = df->mod_vis;
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CurrentScope = CurrVis->sc_scope;
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DEFofIMPL = 0;
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}
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else {
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df = define(id, CurrentScope, D_MODULE);
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Defined = df;
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open_scope(CLOSEDSCOPE);
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df->mod_vis = CurrVis;
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CurrentScope->sc_name = id->id_text;
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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(&nd) IDENT
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{ InitProc(nd, df);
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close_scope(SC_CHKFORW|SC_CHKPROC|SC_REVERSE);
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match_id(id, dot.TOK_IDF);
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}
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'.'
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;
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Module
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{
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int state = PROGRAM;
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} :
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DefinitionModule
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[
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IMPLEMENTATION { state = IMPLEMENTATION; }
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]?
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ProgramModule(state)
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;
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CompilationUnit:
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Module
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;
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