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Report errors for illegal pointer arithmetic operations.

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These include arithmetic on pointers to incomplete types or functions, as well as subtraction of pointers to incompatible types.
This commit is contained in:
Stephen Heumann 2017-10-29 20:21:36 -05:00
parent dddae89af0
commit 8d31481182
2 changed files with 10 additions and 0 deletions
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9
Expression.pas
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@ -2170,6 +2170,8 @@ procedure ChangePointer (op: pcodes; size: longint; tp: baseTypeEnum);
{ tp - type of the integer operand }
begin {ChangePointer}
if size = 0 then
Error(122);
case tp of
cgByte,cgUByte,cgWord,cgUWord: begin
if (size = long(size).lsw) and (op = pc_adl)
@ -2494,6 +2496,8 @@ var
end {if}
else {if iType^.kind = pointerType then} begin
lSize := iType^.pType^.size;
if lSize = 0 then
Error(122);
if long(lSize).msw <> 0 then begin
{handle inc/dec of >64K}
@ -3359,6 +3363,11 @@ case tree^.token.kind of
if expressionType^.kind in [arrayType,pointerType] then begin
{subtraction of two pointers}
if size = 0 then
Error(122)
{NOTE: assumes aType & pType overlap in typeRecord}
else if not CompTypes(lType^.aType, expressionType^.aType) then
Error(47);
Gen0(pc_sbl);
if size <> 1 then begin
GenLdcLong(size);

1
Scanner.pas
View File

@ -604,6 +604,7 @@ if list or (numErr <> 0) then begin
119: msg := @'inline specifier is only allowed on functions';
120: msg := @'non-static inline functions are not supported';
121: msg := @'invalid digit for binary constant';
122: msg := @'arithmetic is not allowed on a pointer to an incomplete or function type';
otherwise: Error(57);
end; {case}
writeln(msg^);