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|
{ Old file: tbs0193.pp }
{ overflow checking for 8 and 16 bit operations wrong }
{$mode objfpc}
uses sysutils;
procedure doerror(l: longint);
begin
writeln('error near ',l);
halt(1);
end;
{$R-}
{$Q+}
var i: integer;
b: byte;
l: longint;
c: cardinal;
n: int64;
q: qword;
begin
i := 32767;
i := i + 15;
b := 255;
b := b + 18;
b := 255;
b := b * 8;
b := 255;
b := b * 17;
{ 64 bit cpus do all calculations in 64 bit so longint and cardinal can't overflow }
{$ifndef CPU64}
l := high(longint);
try
l := l+1;
doerror(1);
except
on eintoverflow do
;
else
doerror(2);
end;
l := low(longint);
try
l := l-1;
doerror(3);
except
on eintoverflow do
;
else
doerror(4);
end;
l := low(longint);
try
l := l*2;
doerror(5);
except
on eintoverflow do
;
else
doerror(6);
end;
l := high(longint) div 2;
try
l := l*3;
doerror(7);
except
on eintoverflow do
;
else
doerror(8);
end;
c := high(cardinal);
try
c := c+1;
doerror(11);
except
on eintoverflow do
;
else
doerror(12);
end;
c := high(cardinal) div 2;
try
c := c*3;
doerror(13);
except
on eintoverflow do
;
else
doerror(14);
end;
c := high(cardinal);
try
c := c*high(cardinal);
doerror(15);
except
on eintoverflow do
;
else
doerror(16);
end;
{$endif CPU64}
{$ifdef fpc}
n := high(int64);
try
n := n+1;
doerror(17);
except
on eintoverflow do
;
else
doerror(18);
end;
n := low(int64);
try
n := n-1;
doerror(19);
except
on eintoverflow do
;
else
doerror(20);
end;
n := 0;
try
n := n-1;
except
on eintoverflow do
doerror(39);
end;
n := low(int64);
try
n := n*2;
doerror(21);
except
on eintoverflow do
;
else
doerror(22);
end;
n := high(int64) div 2;
try
n := n*3;
doerror(23);
except
on eintoverflow do
;
else
doerror(24);
end;
q := 0;
try
q := q-1;
doerror(25);
except
on eintoverflow do
;
else
doerror(26);
end;
q := qword(high(qword));
try
q := q+1;
doerror(27);
except
on eintoverflow do
;
else
doerror(28);
end;
q := qword(high(qword)) div qword(2);
try
q := q*qword(3);
doerror(29);
except
on eintoverflow do
;
else
doerror(30);
end;
q := high(qword);
try
q := q*high(qword);
doerror(31);
except
on eintoverflow do
;
else
doerror(32);
end;
{$endif fpc}
End.
|
