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Pointer comparison operations implemented

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git-svn-id: http://picoc.googlecode.com/svn/trunk@260 21eae674-98b7-11dd-bd71-f92a316d2d60
This commit is contained in:
zik.saleeba 2009-04-22 08:19:52 +00:00
parent e5fa7017f0
commit 16c5b72f4d
3 changed files with 29 additions and 5 deletions
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11
TODO
View file

@ -2,14 +2,23 @@ TODO
Bugs:
* assignment in declarators: int *b = &a;
* struct it
{
int a;
int b;
} c;
int *x;
x = &c.a;
printf("%d\n", *x);
XXX
Implement:
* pointer arithmetic
* ternary operator
* casts
* char access/char array access/char * access
* an easier way of checking pointers in library code
* evaluate only first argument of && and || if possible
* array assignment
Improvements:
* #define with arguments

20
expression.c
View file

@ -316,6 +316,8 @@ void ExpressionPostfixOperator(struct ParseState *Parser, struct ExpressionStack
void ExpressionInfixOperator(struct ParseState *Parser, struct ExpressionStack **StackTop, enum LexToken Op, struct Value *BottomValue, struct Value *TopValue)
{
int ResultInt = 0;
struct PointerValue Pointer;
struct Value *StackValue;
if (Parser->Mode != RunModeRun)
{
@ -433,8 +435,6 @@ void ExpressionInfixOperator(struct ParseState *Parser, struct ExpressionStack *
{
/* pointer/integer infix arithmetic */
int TopInt = COERCE_INTEGER(TopValue);
struct PointerValue Pointer;
struct Value *StackValue;
if (Op == TokenEqual || Op == TokenNotEqual)
{
@ -462,7 +462,7 @@ void ExpressionInfixOperator(struct ParseState *Parser, struct ExpressionStack *
Pointer.Offset -= TopInt * Size;
/* check pointer bounds */
if (Pointer.Offset < 0 || Pointer.Offset > TypeSizeValue(BottomValue->Val->Pointer.Segment) - Size)
if (Pointer.Offset < 0 || Pointer.Offset > TypeLastAccessibleOffset(Pointer.Segment))
Pointer.Offset = BottomValue->Val->Pointer.Offset;
StackValue = ExpressionStackPushValueByType(Parser, StackTop, BottomValue->Typ);
@ -479,6 +479,20 @@ void ExpressionInfixOperator(struct ParseState *Parser, struct ExpressionStack *
else
ProgramFail(Parser, "invalid operation");
}
else if (BottomValue->Typ->Base == TypePointer && TopValue->Typ->Base == TypePointer && Op != TokenAssign)
{
/* pointer/pointer operations */
void *TopLoc = (void *)TopValue->Val->Pointer.Segment->Val + TopValue->Val->Pointer.Offset;
void *BottomLoc = (void *)BottomValue->Val->Pointer.Segment->Val + BottomValue->Val->Pointer.Offset;
switch (Op)
{
case TokenEqual: ExpressionPushInt(Parser, StackTop, BottomLoc == TopLoc); break;
case TokenNotEqual: ExpressionPushInt(Parser, StackTop, BottomLoc != TopLoc); break;
case TokenMinus: ExpressionPushInt(Parser, StackTop, BottomLoc - TopLoc); break;
default: ProgramFail(Parser, "invalid operation"); break;
}
}
else if (Op == TokenAssign)
{
/* assign a non-numeric type */

3
tests/Makefile
View file

@ -17,7 +17,8 @@ TESTS= 00_assignment.test \
16_nesting.test \
17_enum.test \
18_include.test \
19_pointer_arithmetic.test
19_pointer_arithmetic.test \
20_pointer_comparison.test
%.test: %.expect %.c
@echo Test: $*...