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(* Copyright (C) 2015-2025 Free Software Foundation, Inc.
This file is part of GNU Modula-2.
GNU Modula-2 is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GNU Modula-2 is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. *)
IMPLEMENTATION MODULE mcComp ;
FROM FIO IMPORT StdErr ;
FROM libc IMPORT exit ;
FROM decl IMPORT node, isNodeF, isDef, isImp, isModule, isMainModule,
setMainModule, setCurrentModule, getSource, isImpOrModule,
lookupDef, lookupModule, lookupImp, setSource, getSymName,
foreachDefModuleDo, foreachModModuleDo,
getMainModule, out, hasHidden,
setVisited, unsetVisited, isVisited ;
FROM symbolKey IMPORT performOperation ;
FROM SYSTEM IMPORT ADDRESS ;
FROM mcReserved IMPORT toktype ;
FROM mcSearch IMPORT findSourceDefFile, findSourceModFile ;
FROM mcLexBuf IMPORT openSource, closeSource, currenttoken, getToken, reInitialize, currentstring ;
FROM mcFileName IMPORT calculateFileName ;
FROM mcPreprocess IMPORT preprocessModule ;
FROM FormatStrings IMPORT Sprintf1 ;
IMPORT mcflex ;
IMPORT mcp1 ;
IMPORT mcp2 ;
IMPORT mcp3 ;
IMPORT mcp4 ;
IMPORT mcp5 ;
IMPORT mcComment ;
FROM mcError IMPORT writeFormat0, flushErrors, flushWarnings ;
FROM nameKey IMPORT Name, NulName, getKey, keyToCharStar, makekey ;
FROM mcPrintf IMPORT fprintf1 ;
FROM mcQuiet IMPORT qprintf0, qprintf1, qprintf2 ;
FROM DynamicStrings IMPORT String, InitString, KillString, InitStringCharStar, Dup, Mark, string ;
FROM mcOptions IMPORT getExtendedOpaque ;
CONST
Debugging = FALSE ;
TYPE
parserFunction = PROCEDURE () : BOOLEAN ;
openFunction = PROCEDURE (node, BOOLEAN) : BOOLEAN ;
VAR
currentPass: CARDINAL ;
(*
doCompile - translate file, s, using a 6 pass technique.
*)
PROCEDURE doCompile (s: String) ;
VAR
n: node ;
BEGIN
n := initParser (s) ;
doPass (TRUE, TRUE, 1, p1, 'lexical analysis, modules, root decls and C preprocessor') ;
doPass (TRUE, TRUE, 2, p2, '[all modules] type equivalence and enumeration types') ;
doPass (TRUE, TRUE, 3, p3, '[all modules] import lists, types, variables and procedure declarations') ;
doPass (TRUE, TRUE, 4, p4, '[all modules] constant expressions') ;
IF NOT isDef (n)
THEN
IF isImp (n)
THEN
qprintf0 ('Parse implementation module\n') ;
doPass (FALSE, TRUE, 5, p5, '[implementation module] build code tree for all procedures and module initializations')
ELSE
qprintf0 ('Parse program module\n') ;
doPass (FALSE, TRUE, 5, p5, '[program module] build code tree for all procedures and module initializations')
END ;
END ;
qprintf0 ('walk tree converting it to C/C++\n') ;
out
END doCompile ;
(*
compile - check, s, is non NIL before calling doCompile.
*)
PROCEDURE compile (s: String) ;
BEGIN
IF s#NIL
THEN
doCompile (s)
END
END compile ;
(*
examineCompilationUnit - opens the source file to obtain the module name and kind of module.
*)
PROCEDURE examineCompilationUnit () : node ;
BEGIN
(* stop if we see eof, ';' or '[' *)
WHILE (currenttoken#eoftok) AND (currenttoken#semicolontok) AND (currenttoken#lsbratok) DO
IF currenttoken=definitiontok
THEN
getToken ;
IF currenttoken=moduletok
THEN
getToken ;
IF currenttoken=fortok
THEN
getToken ;
IF currenttoken=stringtok
THEN
getToken
ELSE
mcflex.mcError (string (InitString ('expecting language string after FOR keyword'))) ;
exit (1)
END
END ;
IF currenttoken=identtok
THEN
RETURN lookupDef (makekey (currentstring))
END
ELSE
mcflex.mcError (string (InitString ('MODULE missing after DEFINITION keyword')))
END
ELSIF currenttoken=implementationtok
THEN
getToken ;
IF currenttoken=moduletok
THEN
getToken ;
IF currenttoken=identtok
THEN
RETURN lookupImp (makekey (currentstring))
END
ELSE
mcflex.mcError (string (InitString ('MODULE missing after IMPLEMENTATION keyword')))
END
ELSIF currenttoken=moduletok
THEN
getToken ;
IF currenttoken=identtok
THEN
RETURN lookupModule (makekey (currentstring))
END
END ;
getToken
END ;
mcflex.mcError (string (InitString ('failed to find module name'))) ;
exit (1)
END examineCompilationUnit ;
(*
peepInto - peeps into source, s, and initializes a definition/implementation or
program module accordingly.
*)
PROCEDURE peepInto (s: String) : node ;
VAR
n : node ;
fileName: String ;
BEGIN
fileName := preprocessModule (s) ;
IF openSource (fileName)
THEN
n := examineCompilationUnit () ;
setSource (n, makekey (string (fileName))) ;
setMainModule (n) ;
closeSource ;
reInitialize ;
RETURN n
ELSE
fprintf1 (StdErr, 'failed to open %s\n', s) ;
exit (1)
END
END peepInto ;
(*
initParser - returns the node of the module found in the source file.
*)
PROCEDURE initParser (s: String) : node ;
BEGIN
qprintf1 ('Compiling: %s\n', s) ;
RETURN peepInto (s)
END initParser ;
(*
p1 - wrap the pass procedure with the correct parameter values.
*)
PROCEDURE p1 (n: node) ;
BEGIN
IF isDef (n)
THEN
pass (1, n, mcp1.CompilationUnit, isDef, openDef) ;
IF hasHidden (n) AND getExtendedOpaque ()
THEN
pass (1, lookupImp (getSymName (n)), mcp1.CompilationUnit, isImp, openMod)
END
ELSE
pass (1, n, mcp1.CompilationUnit, isImpOrModule, openMod)
END
END p1 ;
(*
p2 - wrap the pass procedure with the correct parameter values.
*)
PROCEDURE p2 (n: node) ;
BEGIN
IF isDef (n)
THEN
pass (2, n, mcp2.CompilationUnit, isDef, openDef) ;
IF hasHidden (n) AND getExtendedOpaque ()
THEN
pass (2, lookupImp (getSymName (n)), mcp2.CompilationUnit, isImp, openMod)
END
ELSE
pass (2, n, mcp2.CompilationUnit, isImpOrModule, openMod)
END
END p2 ;
(*
p3 - wrap the pass procedure with the correct parameter values.
*)
PROCEDURE p3 (n: node) ;
BEGIN
IF isDef (n)
THEN
pass (3, n, mcp3.CompilationUnit, isDef, openDef) ;
IF hasHidden (n) AND getExtendedOpaque ()
THEN
pass (3, lookupImp (getSymName (n)), mcp3.CompilationUnit, isImp, openMod)
END
ELSE
pass (3, n, mcp3.CompilationUnit, isImpOrModule, openMod)
END
END p3 ;
(*
p4 - wrap the pass procedure with the correct parameter values.
*)
PROCEDURE p4 (n: node) ;
BEGIN
IF isDef (n)
THEN
pass (4, n, mcp4.CompilationUnit, isDef, openDef) ;
IF hasHidden (n) AND getExtendedOpaque ()
THEN
pass (4, lookupImp (getSymName (n)), mcp4.CompilationUnit, isImp, openMod)
END
ELSE
pass (4, n, mcp4.CompilationUnit, isImpOrModule, openMod)
END
END p4 ;
(*
p5 - wrap the pass procedure with the correct parameter values.
*)
PROCEDURE p5 (n: node) ;
BEGIN
pass (5, n, mcp5.CompilationUnit, isImpOrModule, openMod)
END p5 ;
(*
doOpen -
*)
PROCEDURE doOpen (n: node; symName, fileName: String; exitOnFailure: BOOLEAN) : BOOLEAN ;
VAR
postProcessed: String ;
BEGIN
qprintf2(' Module %-20s : %s\n', symName, fileName) ;
postProcessed := preprocessModule (fileName) ;
setSource (n, makekey (string (postProcessed))) ;
setCurrentModule (n) ;
IF openSource (postProcessed)
THEN
RETURN TRUE
END ;
fprintf1 (StdErr, 'failed to open %s\n', fileName) ;
IF exitOnFailure
THEN
exit (1)
END ;
RETURN FALSE
END doOpen ;
(*
openDef - try and open the definition module source file.
Returns true/false if successful/unsuccessful or
exitOnFailure.
*)
PROCEDURE openDef (n: node; exitOnFailure: BOOLEAN) : BOOLEAN ;
VAR
sourceName: Name ;
symName,
fileName : String ;
BEGIN
sourceName := getSource (n) ;
symName := InitStringCharStar (keyToCharStar (getSymName (n))) ;
IF sourceName=NulName
THEN
IF NOT findSourceDefFile (symName, fileName)
THEN
fprintf1 (StdErr, 'failed to find definition module %s.def\n', symName) ;
IF exitOnFailure
THEN
exit (1)
END
END
ELSE
fileName := InitStringCharStar (keyToCharStar (sourceName))
END ;
RETURN doOpen (n, symName, fileName, exitOnFailure)
END openDef ;
(*
openMod - try and open the implementation/program module source file.
Returns true/false if successful/unsuccessful or
exitOnFailure.
*)
PROCEDURE openMod (n: node; exitOnFailure: BOOLEAN) : BOOLEAN ;
VAR
sourceName: Name ;
symName,
fileName : String ;
BEGIN
sourceName := getSource (n) ;
symName := InitStringCharStar (keyToCharStar (getSymName (n))) ;
IF sourceName=NulName
THEN
IF NOT findSourceModFile (symName, fileName)
THEN
IF isImp (n)
THEN
fprintf1 (StdErr, 'failed to find implementation module %s.mod\n', symName)
ELSE
fprintf1 (StdErr, 'failed to find program module %s.mod\n', symName)
END ;
IF exitOnFailure
THEN
exit (1)
END
END
ELSE
fileName := InitStringCharStar (keyToCharStar (sourceName))
END ;
RETURN doOpen (n, symName, fileName, exitOnFailure)
END openMod ;
(*
pass -
*)
PROCEDURE pass (no: CARDINAL; n: node; f: parserFunction;
isnode: isNodeF; open: openFunction) ;
BEGIN
IF isnode (n) AND (NOT isVisited (n))
THEN
setVisited (n) ;
IF open (n, TRUE)
THEN
IF NOT f ()
THEN
writeFormat0 ('compilation failed') ;
closeSource ;
RETURN
END ;
closeSource
END
END
END pass ;
(*
doPass -
*)
PROCEDURE doPass (parseDefs, parseMain: BOOLEAN;
no: CARDINAL; p: performOperation; desc: ARRAY OF CHAR) ;
VAR
descs: String ;
BEGIN
setToPassNo (no) ;
descs := InitString (desc) ;
qprintf2 ('Pass %d: %s\n', no, descs) ;
foreachDefModuleDo (unsetVisited) ;
foreachModModuleDo (unsetVisited) ;
IF parseMain
THEN
unsetVisited (getMainModule ()) ;
IF parseDefs AND isImp (getMainModule ())
THEN
(* we need to parse the definition module of a corresponding implementation module. *)
p (lookupDef (getSymName (getMainModule ())))
END ;
p (getMainModule ())
END ;
IF parseDefs
THEN
foreachDefModuleDo (p)
END ;
flushWarnings ; flushErrors ;
setToPassNo (0)
END doPass ;
(*
setToPassNo -
*)
PROCEDURE setToPassNo (n: CARDINAL) ;
BEGIN
currentPass := n
END setToPassNo ;
(*
getPassNo - return the pass no.
*)
PROCEDURE getPassNo () : CARDINAL ;
BEGIN
RETURN currentPass
END getPassNo ;
(*
init - initialise data structures for this module.
*)
PROCEDURE init ;
BEGIN
setToPassNo (0)
END init ;
BEGIN
init
END mcComp.
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