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Allow for empty macro arguments, as specified by C99 and later.

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These were previously allowed in some cases, but not as the last argument to a macro. Also, stringization and concatenation of them did not behave according to the standards.
This commit is contained in:
Stephen Heumann 2020-01-20 19:49:22 -06:00
parent 656868a095
commit 06a3719304
2 changed files with 43 additions and 31 deletions
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72
Scanner.pas
View File

@ -1363,37 +1363,35 @@ if macro^.parameters >= 0 then begin {find the values of the parameters}
parmEnd := nil;
repeat
done := true;
if token.kind <> rparench then begin
parenCount := 0;
paramCount := paramCount+1;
new(newParm);
newParm^.next := nil;
if parmEnd = nil then
parms := newParm
else
parmEnd^.next := newParm;
parmEnd := newParm;
newParm^.tokens := nil;
while (token.kind <> eofsy)
and ((parenCount <> 0)
or (not (token.kind in [rparench,commach]))) do begin
new(tPtr);
tPtr^.next := newParm^.tokens;
newParm^.tokens := tPtr;
tPtr^.token := token;
tPtr^.tokenStart := tokenStart;
tPtr^.tokenEnd := tokenEnd;
tPtr^.expandEnabled := tokenExpandEnabled;
if token.kind = lparench then
parenCount := parenCount+1
else if token.kind = rparench then
parenCount := parenCount-1;
NextToken;
end; {while}
if token.kind = commach then begin
NextToken;
done := false;
end; {if}
parenCount := 0;
paramCount := paramCount+1;
new(newParm);
newParm^.next := nil;
if parmEnd = nil then
parms := newParm
else
parmEnd^.next := newParm;
parmEnd := newParm;
newParm^.tokens := nil;
while (token.kind <> eofsy)
and ((parenCount <> 0)
or (not (token.kind in [rparench,commach]))) do begin
new(tPtr);
tPtr^.next := newParm^.tokens;
newParm^.tokens := tPtr;
tPtr^.token := token;
tPtr^.tokenStart := tokenStart;
tPtr^.tokenEnd := tokenEnd;
tPtr^.expandEnabled := tokenExpandEnabled;
if token.kind = lparench then
parenCount := parenCount+1
else if token.kind = rparench then
parenCount := parenCount-1;
NextToken;
end; {while}
if token.kind = commach then begin
NextToken;
done := false;
end; {if}
until done;
if paramCount <> macro^.parameters then
@ -1501,6 +1499,8 @@ else begin
{handle macro stringization}
if stringization then begin
tcPtr := pptr^.tokens;
if tcPtr = nil then
BuildStringToken(nil, 0);
while tcPtr <> nil do begin
if tcPtr^.token.kind = stringconst then
BuildStringToken(@tcPtr^.token.sval^.str,
@ -1516,6 +1516,16 @@ else begin
{expand a macro parameter}
else begin
tcPtr := pptr^.tokens;
if tcPtr = nil then begin
if tlPtr^.next <> nil then
if tlPtr^.next^.token.kind = poundpoundop then
tlPtr^.next := tlPtr^.next^.next;
if lastPtr <> nil then
if lastPtr^.token.kind = poundpoundop then
if tokenList <> nil then
if tokenList^.token.kind = poundpoundop then
tokenList := tokenList^.next;
end; {if}
while tcPtr <> nil do begin
tokenStart := tcPtr^.tokenStart;
tokenEnd := tcPtr^.tokenEnd;

2
cc.notes
View File

@ -868,6 +868,8 @@ int foo(int[42]);
109. strtoul() should return 0 when given an empty string. It now does, and also sets errno to EINVAL in that case.
(This was a regression introduced in ORCA/C 2.2.0 B3.)
110. Any or all of the arguments to a function-like macro can be empty, as specified in the C99 and later standards. (Empty macro arguments previously worked in some cases, but gave errors or non-standard behavior in others.)
-- Bugs from C 2.1.0 that have been fixed -----------------------------------
1. In some situations, fread() reread the first 1K or so of the file.