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Remove code that treats # as an illegal character in most places.

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C90 had constraints requiring # and ## tokens to only appear in preprocessing directives, but C99 and later removed those constraints, so this code is no longer necessary when targeting current languages versions. (It would be necessary in a "strict C90" mode, if that was ever implemented.)

The main practical effect of this is that # and ## tokens can be passed as parameters to macros, provided the macro either ignores or stringizes that parameter. # and ## tokens still have no role in the grammar of the C language after preprocessing, so they will be an unexpected token and produce some kind of error if they appear anywhere.

This also contains a change to ensure that a line containing one or more illegal characters (e.g. $) and then a # is not treated as a preprocessing directive.
This commit is contained in:
Stephen Heumann 2022-10-13 18:12:02 -05:00
parent 99a10590b1
commit b8b7dc2c2b
4 changed files with 20 additions and 41 deletions
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4
Asm.pas
View File

@ -166,10 +166,8 @@ var
{ An error was found: skip to the end & quit }
begin {Skip}
charKinds[ord('#')] := ch_pound;
while not (token.kind in [rbracech,eofsy]) do
NextToken;
charKinds[ord('#')] := illegal;
goto 99;
end; {Skip}
@ -329,7 +327,6 @@ while not (token.kind in [rbracech,eofsy]) do begin
{find the label and op-code}
CheckForComment;
charKinds[ord('#')] := ch_pound; {allow # as a token}
if token.kind <> ident then begin {error if not an identifier}
Error(9);
Skip;
@ -345,7 +342,6 @@ while not (token.kind in [rbracech,eofsy]) do begin
opname := token;
NextToken;
end; {while}
charKinds[ord('#')] := illegal; {don't allow # as a token}
{identify the op-code}
if length(opname.name^) = 3 then begin

18
Parser.pas
View File

@ -3625,33 +3625,19 @@ var
var
braceCount: integer; {# of unmatched { chars}
doingAsm: boolean; {compiling an asm statement?}
begin {SkipFunction}
Match(lbracech,27); {skip to the closing rbrackch}
braceCount := 1;
doingAsm := false;
if isAsm then
charKinds[ord('#')] := ch_pound;
while (not (token.kind = eofsy)) and (braceCount <> 0) do begin
if token.kind = asmsy then begin
doingAsm := true;
charKinds[ord('#')] := ch_pound;
end {if}
else if token.kind = lbracech then
if token.kind = lbracech then
braceCount := braceCount+1
else if token.kind = rbracech then begin
else if token.kind = rbracech then
braceCount := braceCount-1;
if doingAsm then begin
doingAsm := false;
charKinds[ord('#')] := illegal;
end; {if}
end; {else if}
NextToken;
end; {while}
nameFound := false; {no pc_nam for the next function (yet)}
doingFunction := false; {no longer doing a function}
charKinds[ord('#')] := illegal; {# is a preprocessor command}
end; {SkipFunction}

37
Scanner.pas
View File

@ -2545,7 +2545,6 @@ var
mPtr^.saved := false; {not saved in symbol file}
mPtr^.tokens := nil; {no tokens yet}
mPtr^.isVarargs := false; {not varargs (yet)}
charKinds[ord('#')] := ch_pound; {allow # as a token}
if ch = '(' then begin {scan the parameter list...}
NextToken; {done with the name token...}
NextToken; {skip the opening '('}
@ -2750,7 +2749,6 @@ var
parameterList := np^.next;
dispose(np);
end; {while}
charKinds[ord('#')] := illegal; {don't allow # as a token}
saveNumber := false; {stop saving numeric strings}
end; {DoDefine}
@ -3480,7 +3478,6 @@ else if charKinds[ord(ch)] = ch_eol {allow null commands}
if not tSkipping then
Error(8); {bad preprocessor command}
2:
charKinds[ord('#')] := ch_pound; {allow # as a token}
expandMacros := false; {skip to the end of the line}
flagOverflows := false;
skipping := tSkipping;
@ -3488,7 +3485,6 @@ while not (token.kind in [eolsy,eofsy]) do
NextToken;
flagOverflows := true;
expandMacros := true;
charKinds[ord('#')] := illegal; {don't allow # as a token}
reportEOL := lReportEOL; {restore flags}
suppressMacroExpansions := lSuppressMacroExpansions;
skipping := tskipping;
@ -4243,7 +4239,6 @@ new(macros); {no preprocessor macros so far}
for i := 0 to hashSize do
macros^[i] := nil;
pathList := nil; {no additional search paths}
charKinds[ord('#')] := illegal; {don't allow # as a token}
tokenList := nil; {nothing in putback buffer}
saveNumber := false; {don't save numbers}
expandMacros := true; {enable macro expansion}
@ -4619,7 +4614,7 @@ procedure NextToken;
{ Read the next token from the file. }
label 1,2,3,4,5,6;
label 1,2,3,4,5,6,7;
type
three = (s100,s1000,sMAX); {these declarations are used for a}
@ -4974,21 +4969,14 @@ if tokenList <> nil then begin {get a token put back by a macro}
goto 2;
end; {if}
5: {skip white space}
while charKinds[ord(ch)] in [illegal,ch_white,ch_eol] do begin
if charKinds[ord(ch)] = illegal then begin
if (ch = '#') and (lastWasReturn or (token.kind = eolsy)) then begin
while charKinds[ord(ch)] in [illegal,ch_white,ch_eol,ch_pound] do begin
if charKinds[ord(ch)] = ch_pound then begin
if lastWasReturn or (token.kind = eolsy) then begin
NextCh; {skip the '#' char}
PreProcess {call the preprocessor}
end {if}
else begin
tokenLine := lineNumber; {record a # token}
tokenColumn := ord(ord4(chPtr)-ord4(firstPtr));
tokenStart := pointer(ord4(chPtr)-1);
tokenEnd := chPtr;
if (not skipping) or (not (skipIllegalTokens or (ch = '#'))) then
Error(1);
NextCh;
end; {else}
else
goto 7;
end {if}
else if (charKinds[ord(ch)] = ch_eol) and reportEOL then begin
token.class := reservedSymbol; {record an eol token}
@ -5000,6 +4988,16 @@ while charKinds[ord(ch)] in [illegal,ch_white,ch_eol] do begin
NextCh;
goto 2;
end {if}
else if charKinds[ord(ch)] = illegal then begin
tokenLine := lineNumber; {record an illegal token}
tokenColumn := ord(ord4(chPtr)-ord4(firstPtr));
tokenStart := pointer(ord4(chPtr)-1);
tokenEnd := chPtr;
token.kind := questionch; {make sure it is not eolsy}
if (not skipping) or (not skipIllegalTokens) then
Error(1);
NextCh;
end {else if}
else begin {skip white space}
if printMacroExpansions and not suppressMacroExpansions then
if charKinds[ord(ch)] = ch_eol then begin
@ -5011,6 +5009,7 @@ while charKinds[ord(ch)] in [illegal,ch_white,ch_eol] do begin
NextCh;
end;
end; {while}
7:
tokenLine := lineNumber; {record the position of the token}
tokenColumn := ord(ord4(currentChPtr)-ord4(firstPtr)+1);
tokenStart := currentChPtr;
@ -5183,8 +5182,6 @@ case charKinds[ord(ch)] of
token.isDigraph := true;
if (ch = '%') and (chPtr <> eofPtr) and (chr(chPtr^) = ':') then begin
token.kind := poundpoundop; {%:%: digraph}
if charKinds[ord('#')] = illegal then
Error(1);
NextCh;
NextCh;
end

2
Table.asm
View File

@ -57,7 +57,7 @@ charKinds start character set
dc i'ch_white' space
dc i'ch_exc' !
dc i'ch_string' "
dc i'illegal' #
dc i'ch_pound' #
dc i'illegal' $
dc i'ch_percent' %
dc i'ch_and' &