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Implement the _Alignof operator (from C11).

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In ORCA/C, the alignment of all object types is 1.
This commit is contained in:
Stephen Heumann 2020-01-05 18:09:26 -06:00
parent 9036a98e1c
commit 3121a465f1
3 changed files with 27 additions and 9 deletions
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31
Expression.pas
View File

@ -576,6 +576,7 @@ label 1,2,3;
var
done,done2: boolean; {for loop termination}
doingSizeof: boolean; {used to test for a sizeof operator}
doingAlignof: boolean; {used to test for an _Alignof operator}
expectingTerm: boolean; {should the next token be a term?}
opStack: tokenPtr; {operation stack}
parenCount: integer; {# of open parenthesis}
@ -1228,6 +1229,7 @@ var
opplusplus, {postfix ++}
opminusminus, {postfix --}
sizeofsy, {sizeof}
_Alignofsy, {_Alignof (erroneous uses)}
castoper, {(type)}
typedef, {(type-name)}
tildech, {~}
@ -1255,6 +1257,15 @@ var
op^.left := nil;
end {if sizeofsy}
else if op^.token.kind = _Alignofsy then begin
{error case: operand of _Alignof is not a parenthesized type-name}
Error(36);
op^.token.kind := ulongConst;
op^.token.class := longConstant;
op^.token.lval := 1;
dispose(op^.left);
end {else if _Alignofsy}
else if op^.token.kind = castoper then begin
class := op^.left^.token.class;
if class in [intConstant,longConstant,doubleConstant] then begin
@ -1486,7 +1497,7 @@ var
if token.kind = constsy then
tp^.isConstant := true
else {if token.kind = volatilesy then}
if not doingSizeof then
if not (doingSizeof or doingAlignof) then
volatile := true;
NextToken;
end; {while}
@ -1659,11 +1670,14 @@ if token.kind in startExpression then begin
doublesy,compsy,extendedsy,voidsy,enumsy,structsy,unionsy,
typedef,constsy,volatilesy,signedsy] then begin
doingSizeof := false;
doingAlignof := false;
if opStack <> nil then
if opStack^.token.kind = sizeofsy then
doingSizeof := true;
doingSizeof := true
else if opStack^.token.kind = _Alignofsy then
doingAlignof := true;
TypeName;
if doingSizeof then begin
if doingSizeof or doingAlignof then begin
{handle a sizeof operator}
op := opStack;
@ -1676,10 +1690,13 @@ if token.kind in startExpression then begin
sp^.right := nil;
sp^.token.kind := ulongconst;
sp^.token.class := longConstant;
sp^.token.lval := typeSpec^.size;
if doingSizeof then
sp^.token.lval := typeSpec^.size
else {if doingAlignof then}
sp^.token.lval := 1;
with typeSpec^ do
if (size = 0) or ((kind = arrayType) and (elements = 0)) then
Error(49);
Error(133);
sp^.next := stack;
stack := sp;
expectingTerm := false;
@ -1743,7 +1760,7 @@ if token.kind in startExpression then begin
errorFound := true;
end; {if}
if token.kind in {make sure we get what we want}
[plusplusop,minusminusop,sizeofsy,tildech,excch,
[plusplusop,minusminusop,sizeofsy,_Alignofsy,tildech,excch,
uasterisk,uminus,uand] then begin
if not expectingTerm then begin
Error(38);
@ -3999,7 +4016,7 @@ startTerm := [ident,intconst,uintconst,longconst,ulongconst,doubleconst,
stringconst];
startExpression:= startTerm +
[lparench,asteriskch,andch,plusch,minusch,excch,tildech,sizeofsy,
plusplusop,minusminusop,typedef];
plusplusop,minusminusop,typedef,_Alignofsy];
end; {InitExpression}
end.

1
Scanner.pas
View File

@ -647,6 +647,7 @@ if list or (numErr <> 0) then begin
130: msg := @'lint: invalid shift count';
131: msg := @'numeric constant is too long';
132: msg := @'static assertion failed';
133: msg := @'incomplete or function types may not be used here';
otherwise: Error(57);
end; {case}
writeln(msg^);

4
Table.asm
View File

@ -359,7 +359,7 @@ icp start in comming priority for expression
dc i1'200' doubleconst
dc i1'200' stringconst
dc i1'200' _Alignassy
dc i1'200' _Alignofsy
dc i1'16' _Alignofsy
dc i1'200' _Atomicsy
dc i1'200' _Boolsy
dc i1'200' _Complexsy
@ -524,7 +524,7 @@ isp start in stack priority for expression
dc i1'0' doubleconst
dc i1'0' stringconst
dc i1'0' _Alignassy
dc i1'0' _Alignofsy
dc i1'16' _Alignofsy
dc i1'0' _Atomicsy
dc i1'0' _Boolsy
dc i1'0' _Complexsy