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expression.c
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expression.c
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/* picoc expression evaluator - a stack-based expression evaluation system
* which handles operator precedence */
#include "interpreter.h"
/* whether evaluation is left to right for a given precedence level */
#define IS_LEFT_TO_RIGHT(p) ((p) != 2 && (p) != 14)
#define BRACKET_PRECEDENCE 20
/* If the destination is not float, we can't assign a floating value to it, we need to convert it to integer instead */
#define ASSIGN_FP_OR_INT(value) \
if (IS_FP(BottomValue)) { ResultFP = ExpressionAssignFP(Parser, BottomValue, value); } \
else { ResultInt = ExpressionAssignInt(Parser, BottomValue, (long)(value), FALSE); ResultIsInt = TRUE; } \
#define DEEP_PRECEDENCE (BRACKET_PRECEDENCE*1000)
#ifdef DEBUG_EXPRESSIONS
#define debugf printf
#else
void debugf(char *Format, ...)
{
}
#endif
/* local prototypes */
enum OperatorOrder
{
OrderNone,
OrderPrefix,
OrderInfix,
OrderPostfix
};
/* a stack of expressions we use in evaluation */
struct ExpressionStack
{
struct ExpressionStack *Next; /* the next lower item on the stack */
struct Value *Val; /* the value for this stack node */
enum LexToken Op; /* the operator */
short unsigned int Precedence; /* the operator precedence of this node */
unsigned char Order; /* the evaluation order of this operator */
};
/* operator precedence definitions */
struct OpPrecedence
{
unsigned int PrefixPrecedence:4;
unsigned int PostfixPrecedence:4;
unsigned int InfixPrecedence:4;
char *Name;
};
/* NOTE: the order of this array must correspond exactly to the order of these tokens in enum LexToken */
static struct OpPrecedence OperatorPrecedence[] =
{
/* TokenNone, */ { 0, 0, 0, "none" },
/* TokenComma, */ { 0, 0, 0, "," },
/* TokenAssign, */ { 0, 0, 2, "=" }, /* TokenAddAssign, */ { 0, 0, 2, "+=" }, /* TokenSubtractAssign, */ { 0, 0, 2, "-=" },
/* TokenMultiplyAssign, */ { 0, 0, 2, "*=" }, /* TokenDivideAssign, */ { 0, 0, 2, "/=" }, /* TokenModulusAssign, */ { 0, 0, 2, "%=" },
/* TokenShiftLeftAssign, */ { 0, 0, 2, "<<=" }, /* TokenShiftRightAssign, */ { 0, 0, 2, ">>=" }, /* TokenArithmeticAndAssign, */ { 0, 0, 2, "&=" },
/* TokenArithmeticOrAssign, */ { 0, 0, 2, "|=" }, /* TokenArithmeticExorAssign, */ { 0, 0, 2, "^=" },
/* TokenQuestionMark, */ { 0, 0, 3, "?" }, /* TokenColon, */ { 0, 0, 3, ":" },
/* TokenLogicalOr, */ { 0, 0, 4, "||" },
/* TokenLogicalAnd, */ { 0, 0, 5, "&&" },
/* TokenArithmeticOr, */ { 0, 0, 6, "|" },
/* TokenArithmeticExor, */ { 0, 0, 7, "^" },
/* TokenAmpersand, */ { 14, 0, 8, "&" },
/* TokenEqual, */ { 0, 0, 9, "==" }, /* TokenNotEqual, */ { 0, 0, 9, "!=" },
/* TokenLessThan, */ { 0, 0, 10, "<" }, /* TokenGreaterThan, */ { 0, 0, 10, ">" }, /* TokenLessEqual, */ { 0, 0, 10, "<=" }, /* TokenGreaterEqual, */ { 0, 0, 10, ">=" },
/* TokenShiftLeft, */ { 0, 0, 11, "<<" }, /* TokenShiftRight, */ { 0, 0, 11, ">>" },
/* TokenPlus, */ { 14, 0, 12, "+" }, /* TokenMinus, */ { 14, 0, 12, "-" },
/* TokenAsterisk, */ { 14, 0, 13, "*" }, /* TokenSlash, */ { 0, 0, 13, "/" }, /* TokenModulus, */ { 0, 0, 13, "%" },
/* TokenIncrement, */ { 14, 15, 0, "++" }, /* TokenDecrement, */ { 14, 15, 0, "--" }, /* TokenUnaryNot, */ { 14, 0, 0, "!" }, /* TokenUnaryExor, */ { 14, 0, 0, "~" }, /* TokenSizeof, */ { 14, 0, 0, "sizeof" }, /* TokenCast, */ { 14, 0, 0, "cast" },
/* TokenLeftSquareBracket, */ { 0, 0, 15, "[" }, /* TokenRightSquareBracket, */ { 0, 15, 0, "]" }, /* TokenDot, */ { 0, 0, 15, "." }, /* TokenArrow, */ { 0, 0, 15, "->" },
/* TokenOpenBracket, */ { 15, 0, 0, "(" }, /* TokenCloseBracket, */ { 0, 15, 0, ")" }
};
void ExpressionParseFunctionCall(struct ParseState *Parser, struct ExpressionStack **StackTop, const char *FuncName, int RunIt);
#ifdef DEBUG_EXPRESSIONS
/* show the contents of the expression stack */
void ExpressionStackShow(Picoc *pc, struct ExpressionStack *StackTop)
{
printf("Expression stack [0x%lx,0x%lx]: ", (long)pc->HeapStackTop, (long)StackTop);
while (StackTop != NULL)
{
if (StackTop->Order == OrderNone)
{
/* it's a value */
if (StackTop->Val->IsLValue)
printf("lvalue=");
else
printf("value=");
switch (StackTop->Val->Typ->Base)
{
case TypeVoid: printf("void"); break;
case TypeInt: printf("%d:int", StackTop->Val->Val->Integer); break;
case TypeShort: printf("%d:short", StackTop->Val->Val->ShortInteger); break;
case TypeChar: printf("%d:char", StackTop->Val->Val->Character); break;
case TypeLong: printf("%ld:long", StackTop->Val->Val->LongInteger); break;
case TypeUnsignedShort: printf("%d:unsigned short", StackTop->Val->Val->UnsignedShortInteger); break;
case TypeUnsignedInt: printf("%d:unsigned int", StackTop->Val->Val->UnsignedInteger); break;
case TypeUnsignedLong: printf("%ld:unsigned long", StackTop->Val->Val->UnsignedLongInteger); break;
case TypeFP: printf("%f:fp", StackTop->Val->Val->FP); break;
case TypeFunction: printf("%s:function", StackTop->Val->Val->Identifier); break;
case TypeMacro: printf("%s:macro", StackTop->Val->Val->Identifier); break;
case TypePointer:
if (StackTop->Val->Val->Pointer == NULL)
printf("ptr(NULL)");
else if (StackTop->Val->Typ->FromType->Base == TypeChar)
printf("\"%s\":string", (char *)StackTop->Val->Val->Pointer);
else
printf("ptr(0x%lx)", (long)StackTop->Val->Val->Pointer);
break;
case TypeArray: printf("array"); break;
case TypeStruct: printf("%s:struct", StackTop->Val->Val->Identifier); break;
case TypeUnion: printf("%s:union", StackTop->Val->Val->Identifier); break;
case TypeEnum: printf("%s:enum", StackTop->Val->Val->Identifier); break;
case Type_Type: PrintType(StackTop->Val->Val->Typ, pc->CStdOut); printf(":type"); break;
default: printf("unknown"); break;
}
printf("[0x%lx,0x%lx]", (long)StackTop, (long)StackTop->Val);
}
else
{
/* it's an operator */
printf("op='%s' %s %d", OperatorPrecedence[(int)StackTop->Op].Name,
(StackTop->Order == OrderPrefix) ? "prefix" : ((StackTop->Order == OrderPostfix) ? "postfix" : "infix"),
StackTop->Precedence);
printf("[0x%lx]", (long)StackTop);
}
StackTop = StackTop->Next;
if (StackTop != NULL)
printf(", ");
}
printf("\n");
}
#endif
int IsTypeToken(struct ParseState * Parser, enum LexToken t, struct Value * LexValue)
{
if (t >= TokenIntType && t <= TokenUnsignedType)
return 1; /* base type */
/* typedef'ed type? */
if (t == TokenIdentifier) /* see TypeParseFront, case TokenIdentifier and ParseTypedef */
{
struct Value * VarValue;
if (VariableDefined(Parser->pc, LexValue->Val->Pointer))
{
VariableGet(Parser->pc, Parser, LexValue->Val->Pointer, &VarValue);
if (VarValue->Typ == &Parser->pc->TypeType)
return 1;
}
}
return 0;
}
long ExpressionCoerceInteger(struct Value *Val)
{
switch (Val->Typ->Base)
{
case TypeInt: return (long)Val->Val->Integer;
case TypeChar: return (long)Val->Val->Character;
case TypeShort: return (long)Val->Val->ShortInteger;
case TypeLong: return (long)Val->Val->LongInteger;
case TypeUnsignedInt: return (long)Val->Val->UnsignedInteger;
case TypeUnsignedShort: return (long)Val->Val->UnsignedShortInteger;
case TypeUnsignedLong: return (long)Val->Val->UnsignedLongInteger;
case TypeUnsignedChar: return (long)Val->Val->UnsignedCharacter;
case TypePointer: return (long)Val->Val->Pointer;
case TypeFP: return (long)Val->Val->FP;
default: return 0;
}
}
unsigned long ExpressionCoerceUnsignedInteger(struct Value *Val)
{
switch (Val->Typ->Base)
{
case TypeInt: return (unsigned long)Val->Val->Integer;
case TypeChar: return (unsigned long)Val->Val->Character;
case TypeShort: return (unsigned long)Val->Val->ShortInteger;
case TypeLong: return (unsigned long)Val->Val->LongInteger;
case TypeUnsignedInt: return (unsigned long)Val->Val->UnsignedInteger;
case TypeUnsignedShort: return (unsigned long)Val->Val->UnsignedShortInteger;
case TypeUnsignedLong: return (unsigned long)Val->Val->UnsignedLongInteger;
case TypeUnsignedChar: return (unsigned long)Val->Val->UnsignedCharacter;
case TypePointer: return (unsigned long)Val->Val->Pointer;
case TypeFP: return (unsigned long)Val->Val->FP;
default: return 0;
}
}
double ExpressionCoerceFP(struct Value *Val)
{
#ifndef BROKEN_FLOAT_CASTS
int IntVal;
unsigned UnsignedVal;
switch (Val->Typ->Base)
{
case TypeInt: IntVal = Val->Val->Integer; return (double)IntVal;
case TypeChar: IntVal = Val->Val->Character; return (double)IntVal;
case TypeShort: IntVal = Val->Val->ShortInteger; return (double)IntVal;
case TypeLong: IntVal = Val->Val->LongInteger; return (double)IntVal;
case TypeUnsignedInt: UnsignedVal = Val->Val->UnsignedInteger; return (double)UnsignedVal;
case TypeUnsignedShort: UnsignedVal = Val->Val->UnsignedShortInteger; return (double)UnsignedVal;
case TypeUnsignedLong: UnsignedVal = Val->Val->UnsignedLongInteger; return (double)UnsignedVal;
case TypeUnsignedChar: UnsignedVal = Val->Val->UnsignedCharacter; return (double)UnsignedVal;
case TypeFP: return Val->Val->FP;
default: return 0.0;
}
#else
switch (Val->Typ->Base)
{
case TypeInt: return (double)Val->Val->Integer;
case TypeChar: return (double)Val->Val->Character;
case TypeShort: return (double)Val->Val->ShortInteger;
case TypeLong: return (double)Val->Val->LongInteger;
case TypeUnsignedInt: return (double)Val->Val->UnsignedInteger;
case TypeUnsignedShort: return (double)Val->Val->UnsignedShortInteger;
case TypeUnsignedLong: return (double)Val->Val->UnsignedLongInteger;
case TypeUnsignedChar: return (double)Val->Val->UnsignedCharacter;
case TypeFP: return (double)Val->Val->FP;
default: return 0.0;
}
#endif
}
/* assign an integer value */
long ExpressionAssignInt(struct ParseState *Parser, struct Value *DestValue, long FromInt, int After)
{
long Result;
if (!DestValue->IsLValue)
ProgramFail(Parser, "can't assign to this");
if (After)
Result = ExpressionCoerceInteger(DestValue);
else
Result = FromInt;
switch (DestValue->Typ->Base)
{
case TypeInt: DestValue->Val->Integer = FromInt; break;
case TypeShort: DestValue->Val->ShortInteger = (short)FromInt; break;
case TypeChar: DestValue->Val->Character = (char)FromInt; break;
case TypeLong: DestValue->Val->LongInteger = (long)FromInt; break;
case TypeUnsignedInt: DestValue->Val->UnsignedInteger = (unsigned int)FromInt; break;
case TypeUnsignedShort: DestValue->Val->UnsignedShortInteger = (unsigned short)FromInt; break;
case TypeUnsignedLong: DestValue->Val->UnsignedLongInteger = (unsigned long)FromInt; break;
case TypeUnsignedChar: DestValue->Val->UnsignedCharacter = (unsigned char)FromInt; break;
default: break;
}
return Result;
}
/* assign a floating point value */
double ExpressionAssignFP(struct ParseState *Parser, struct Value *DestValue, double FromFP)
{
if (!DestValue->IsLValue)
ProgramFail(Parser, "can't assign to this");
DestValue->Val->FP = FromFP;
return FromFP;
}
/* push a node on to the expression stack */
void ExpressionStackPushValueNode(struct ParseState *Parser, struct ExpressionStack **StackTop, struct Value *ValueLoc)
{
struct ExpressionStack *StackNode = VariableAlloc(Parser->pc, Parser, sizeof(struct ExpressionStack), FALSE);
StackNode->Next = *StackTop;
StackNode->Val = ValueLoc;
*StackTop = StackNode;
#ifdef FANCY_ERROR_MESSAGES
StackNode->Line = Parser->Line;
StackNode->CharacterPos = Parser->CharacterPos;
#endif
#ifdef DEBUG_EXPRESSIONS
ExpressionStackShow(Parser->pc, *StackTop);
#endif
}
/* push a blank value on to the expression stack by type */
struct Value *ExpressionStackPushValueByType(struct ParseState *Parser, struct ExpressionStack **StackTop, struct ValueType *PushType)
{
struct Value *ValueLoc = VariableAllocValueFromType(Parser->pc, Parser, PushType, FALSE, NULL, FALSE);
ExpressionStackPushValueNode(Parser, StackTop, ValueLoc);
return ValueLoc;
}
/* push a value on to the expression stack */
void ExpressionStackPushValue(struct ParseState *Parser, struct ExpressionStack **StackTop, struct Value *PushValue)
{
struct Value *ValueLoc = VariableAllocValueAndCopy(Parser->pc, Parser, PushValue, FALSE);
ExpressionStackPushValueNode(Parser, StackTop, ValueLoc);
}
void ExpressionStackPushLValue(struct ParseState *Parser, struct ExpressionStack **StackTop, struct Value *PushValue, int Offset)
{
struct Value *ValueLoc = VariableAllocValueShared(Parser, PushValue);
ValueLoc->Val = (void *)((char *)ValueLoc->Val + Offset);
ExpressionStackPushValueNode(Parser, StackTop, ValueLoc);
}
void ExpressionStackPushDereference(struct ParseState *Parser, struct ExpressionStack **StackTop, struct Value *DereferenceValue)
{
struct Value *DerefVal;
struct Value *ValueLoc;
int Offset;
struct ValueType *DerefType;
int DerefIsLValue;
void *DerefDataLoc = VariableDereferencePointer(Parser, DereferenceValue, &DerefVal, &Offset, &DerefType, &DerefIsLValue);
if (DerefDataLoc == NULL)
ProgramFail(Parser, "NULL pointer dereference");
ValueLoc = VariableAllocValueFromExistingData(Parser, DerefType, (union AnyValue *)DerefDataLoc, DerefIsLValue, DerefVal);
ExpressionStackPushValueNode(Parser, StackTop, ValueLoc);
}
void ExpressionPushInt(struct ParseState *Parser, struct ExpressionStack **StackTop, long IntValue)
{
struct Value *ValueLoc = VariableAllocValueFromType(Parser->pc, Parser, &Parser->pc->IntType, FALSE, NULL, FALSE);
ValueLoc->Val->Integer = IntValue;
ExpressionStackPushValueNode(Parser, StackTop, ValueLoc);
}
void ExpressionPushFP(struct ParseState *Parser, struct ExpressionStack **StackTop, double FPValue)
{
struct Value *ValueLoc = VariableAllocValueFromType(Parser->pc, Parser, &Parser->pc->FPType, FALSE, NULL, FALSE);
ValueLoc->Val->FP = FPValue;
ExpressionStackPushValueNode(Parser, StackTop, ValueLoc);
}
/* assign to a pointer */
void ExpressionAssignToPointer(struct ParseState *Parser, struct Value *ToValue, struct Value *FromValue, const char *FuncName, int ParamNo, int AllowPointerCoercion)
{
struct ValueType *PointedToType = ToValue->Typ->FromType;
if (FromValue->Typ == ToValue->Typ || FromValue->Typ == Parser->pc->VoidPtrType || (ToValue->Typ == Parser->pc->VoidPtrType && FromValue->Typ->Base == TypePointer))
ToValue->Val->Pointer = FromValue->Val->Pointer; /* plain old pointer assignment */
else if (FromValue->Typ->Base == TypeArray && (PointedToType == FromValue->Typ->FromType || ToValue->Typ == Parser->pc->VoidPtrType))
{
/* the form is: blah *x = array of blah */
ToValue->Val->Pointer = (void *)&FromValue->Val->ArrayMem[0];
}
else if (FromValue->Typ->Base == TypePointer && FromValue->Typ->FromType->Base == TypeArray &&
(PointedToType == FromValue->Typ->FromType->FromType || ToValue->Typ == Parser->pc->VoidPtrType) )
{
/* the form is: blah *x = pointer to array of blah */
ToValue->Val->Pointer = VariableDereferencePointer(Parser, FromValue, NULL, NULL, NULL, NULL);
}
else if (IS_NUMERIC_COERCIBLE(FromValue) && ExpressionCoerceInteger(FromValue) == 0)
{
/* null pointer assignment */
ToValue->Val->Pointer = NULL;
}
else if (AllowPointerCoercion && IS_NUMERIC_COERCIBLE(FromValue))
{
/* assign integer to native pointer */
ToValue->Val->Pointer = (void *)(unsigned long)ExpressionCoerceUnsignedInteger(FromValue);
}
else if (AllowPointerCoercion && FromValue->Typ->Base == TypePointer)
{
/* assign a pointer to a pointer to a different type */
ToValue->Val->Pointer = FromValue->Val->Pointer;
}
else
AssignFail(Parser, "%t from %t", ToValue->Typ, FromValue->Typ, 0, 0, FuncName, ParamNo);
}
/* assign any kind of value */
void ExpressionAssign(struct ParseState *Parser, struct Value *DestValue, struct Value *SourceValue, int Force, const char *FuncName, int ParamNo, int AllowPointerCoercion)
{
if (!DestValue->IsLValue && !Force)
AssignFail(Parser, "not an lvalue", NULL, NULL, 0, 0, FuncName, ParamNo);
if (IS_NUMERIC_COERCIBLE(DestValue) && !IS_NUMERIC_COERCIBLE_PLUS_POINTERS(SourceValue, AllowPointerCoercion))
AssignFail(Parser, "%t from %t", DestValue->Typ, SourceValue->Typ, 0, 0, FuncName, ParamNo);
switch (DestValue->Typ->Base)
{
case TypeInt: DestValue->Val->Integer = ExpressionCoerceInteger(SourceValue); break;
case TypeShort: DestValue->Val->ShortInteger = (short)ExpressionCoerceInteger(SourceValue); break;
case TypeChar: DestValue->Val->Character = (char)ExpressionCoerceInteger(SourceValue); break;
case TypeLong: DestValue->Val->LongInteger = ExpressionCoerceInteger(SourceValue); break;
case TypeUnsignedInt: DestValue->Val->UnsignedInteger = ExpressionCoerceUnsignedInteger(SourceValue); break;
case TypeUnsignedShort: DestValue->Val->UnsignedShortInteger = (unsigned short)ExpressionCoerceUnsignedInteger(SourceValue); break;
case TypeUnsignedLong: DestValue->Val->UnsignedLongInteger = ExpressionCoerceUnsignedInteger(SourceValue); break;
case TypeUnsignedChar: DestValue->Val->UnsignedCharacter = (unsigned char)ExpressionCoerceUnsignedInteger(SourceValue); break;
case TypeFP:
if (!IS_NUMERIC_COERCIBLE_PLUS_POINTERS(SourceValue, AllowPointerCoercion))
AssignFail(Parser, "%t from %t", DestValue->Typ, SourceValue->Typ, 0, 0, FuncName, ParamNo);
DestValue->Val->FP = ExpressionCoerceFP(SourceValue);
break;
case TypePointer:
ExpressionAssignToPointer(Parser, DestValue, SourceValue, FuncName, ParamNo, AllowPointerCoercion);
break;
case TypeArray:
if (SourceValue->Typ->Base == TypeArray && DestValue->Typ->FromType == DestValue->Typ->FromType && DestValue->Typ->ArraySize == 0)
{
/* destination array is unsized - need to resize the destination array to the same size as the source array */
DestValue->Typ = SourceValue->Typ;
VariableRealloc(Parser, DestValue, TypeSizeValue(DestValue, FALSE));
if (DestValue->LValueFrom != NULL)
{
/* copy the resized value back to the LValue */
DestValue->LValueFrom->Val = DestValue->Val;
DestValue->LValueFrom->AnyValOnHeap = DestValue->AnyValOnHeap;
}
}
/* char array = "abcd" */
if (DestValue->Typ->FromType->Base == TypeChar && SourceValue->Typ->Base == TypePointer && SourceValue->Typ->FromType->Base == TypeChar)
{
if (DestValue->Typ->ArraySize == 0) /* char x[] = "abcd", x is unsized */
{
int Size = strlen(SourceValue->Val->Pointer) + 1;
#ifdef DEBUG_ARRAY_INITIALIZER
PRINT_SOURCE_POS;
fprintf(stderr, "str size: %d\n", Size);
#endif
DestValue->Typ = TypeGetMatching(Parser->pc, Parser, DestValue->Typ->FromType, DestValue->Typ->Base, Size, DestValue->Typ->Identifier, TRUE);
VariableRealloc(Parser, DestValue, TypeSizeValue(DestValue, FALSE));
}
/* else, it's char x[10] = "abcd" */
#ifdef DEBUG_ARRAY_INITIALIZER
PRINT_SOURCE_POS;
fprintf(stderr, "char[%d] from char* (len=%d)\n", DestValue->Typ->ArraySize, strlen(SourceValue->Val->Pointer));
#endif
memcpy((void *)DestValue->Val, SourceValue->Val->Pointer, TypeSizeValue(DestValue, FALSE));
break;
}
if (DestValue->Typ != SourceValue->Typ)
AssignFail(Parser, "%t from %t", DestValue->Typ, SourceValue->Typ, 0, 0, FuncName, ParamNo);
if (DestValue->Typ->ArraySize != SourceValue->Typ->ArraySize)
AssignFail(Parser, "from an array of size %d to one of size %d", NULL, NULL, DestValue->Typ->ArraySize, SourceValue->Typ->ArraySize, FuncName, ParamNo);
memcpy((void *)DestValue->Val, (void *)SourceValue->Val, TypeSizeValue(DestValue, FALSE));
break;
case TypeStruct:
case TypeUnion:
if (DestValue->Typ != SourceValue->Typ)
AssignFail(Parser, "%t from %t", DestValue->Typ, SourceValue->Typ, 0, 0, FuncName, ParamNo);
memcpy((void *)DestValue->Val, (void *)SourceValue->Val, TypeSizeValue(SourceValue, FALSE));
break;
default:
AssignFail(Parser, "%t", DestValue->Typ, NULL, 0, 0, FuncName, ParamNo);
break;
}
}
/* evaluate the first half of a ternary operator x ? y : z */
void ExpressionQuestionMarkOperator(struct ParseState *Parser, struct ExpressionStack **StackTop, struct Value *BottomValue, struct Value *TopValue)
{
if (!IS_NUMERIC_COERCIBLE(TopValue))
ProgramFail(Parser, "first argument to '?' should be a number");
if (ExpressionCoerceInteger(TopValue))
{
/* the condition's true, return the BottomValue */
ExpressionStackPushValue(Parser, StackTop, BottomValue);
}
else
{
/* the condition's false, return void */
ExpressionStackPushValueByType(Parser, StackTop, &Parser->pc->VoidType);
}
}
/* evaluate the second half of a ternary operator x ? y : z */
void ExpressionColonOperator(struct ParseState *Parser, struct ExpressionStack **StackTop, struct Value *BottomValue, struct Value *TopValue)
{
if (TopValue->Typ->Base == TypeVoid)
{
/* invoke the "else" part - return the BottomValue */
ExpressionStackPushValue(Parser, StackTop, BottomValue);
}
else
{
/* it was a "then" - return the TopValue */
ExpressionStackPushValue(Parser, StackTop, TopValue);
}
}
/* evaluate a prefix operator */
void ExpressionPrefixOperator(struct ParseState *Parser, struct ExpressionStack **StackTop, enum LexToken Op, struct Value *TopValue)
{
struct Value *Result;
union AnyValue *ValPtr;
debugf("ExpressionPrefixOperator()\n");
switch (Op)
{
case TokenAmpersand:
if (!TopValue->IsLValue)
ProgramFail(Parser, "can't get the address of this");
ValPtr = TopValue->Val;
Result = VariableAllocValueFromType(Parser->pc, Parser, TypeGetMatching(Parser->pc, Parser, TopValue->Typ, TypePointer, 0, Parser->pc->StrEmpty, TRUE), FALSE, NULL, FALSE);
Result->Val->Pointer = (void *)ValPtr;
ExpressionStackPushValueNode(Parser, StackTop, Result);
break;
case TokenAsterisk:
ExpressionStackPushDereference(Parser, StackTop, TopValue);
break;
case TokenSizeof:
/* return the size of the argument */
if (TopValue->Typ == &Parser->pc->TypeType)
ExpressionPushInt(Parser, StackTop, TypeSize(TopValue->Val->Typ, TopValue->Val->Typ->ArraySize, TRUE));
else
ExpressionPushInt(Parser, StackTop, TypeSize(TopValue->Typ, TopValue->Typ->ArraySize, TRUE));
break;
default:
/* an arithmetic operator */
if (TopValue->Typ == &Parser->pc->FPType)
{
/* floating point prefix arithmetic */
double ResultFP = 0.0;
switch (Op)
{
case TokenPlus: ResultFP = TopValue->Val->FP; break;
case TokenMinus: ResultFP = -TopValue->Val->FP; break;
case TokenIncrement: ResultFP = ExpressionAssignFP(Parser, TopValue, TopValue->Val->FP+1); break;
case TokenDecrement: ResultFP = ExpressionAssignFP(Parser, TopValue, TopValue->Val->FP-1); break;
case TokenUnaryNot: ResultFP = !TopValue->Val->FP; break;
default: ProgramFail(Parser, "invalid operation"); break;
}
ExpressionPushFP(Parser, StackTop, ResultFP);
}
else
if (IS_NUMERIC_COERCIBLE(TopValue))
{
/* integer prefix arithmetic */
long ResultInt = 0;
long TopInt = ExpressionCoerceInteger(TopValue);
switch (Op)
{
case TokenPlus: ResultInt = TopInt; break;
case TokenMinus: ResultInt = -TopInt; break;
case TokenIncrement: ResultInt = ExpressionAssignInt(Parser, TopValue, TopInt+1, FALSE); break;
case TokenDecrement: ResultInt = ExpressionAssignInt(Parser, TopValue, TopInt-1, FALSE); break;
case TokenUnaryNot: ResultInt = !TopInt; break;
case TokenUnaryExor: ResultInt = ~TopInt; break;
default: ProgramFail(Parser, "invalid operation"); break;
}
ExpressionPushInt(Parser, StackTop, ResultInt);
}
else if (TopValue->Typ->Base == TypePointer)
{
/* pointer prefix arithmetic */
int Size = TypeSize(TopValue->Typ->FromType, 0, TRUE);
struct Value *StackValue;
void *ResultPtr;
if (TopValue->Val->Pointer == NULL)
ProgramFail(Parser, "invalid use of a NULL pointer");
if (!TopValue->IsLValue)
ProgramFail(Parser, "can't assign to this");
switch (Op)
{
case TokenIncrement: TopValue->Val->Pointer = (void *)((char *)TopValue->Val->Pointer + Size); break;
case TokenDecrement: TopValue->Val->Pointer = (void *)((char *)TopValue->Val->Pointer - Size); break;
default: ProgramFail(Parser, "invalid operation"); break;
}
ResultPtr = TopValue->Val->Pointer;
StackValue = ExpressionStackPushValueByType(Parser, StackTop, TopValue->Typ);
StackValue->Val->Pointer = ResultPtr;
}
else
ProgramFail(Parser, "invalid operation");
break;
}
}
/* evaluate a postfix operator */
void ExpressionPostfixOperator(struct ParseState *Parser, struct ExpressionStack **StackTop, enum LexToken Op, struct Value *TopValue)
{
debugf("ExpressionPostfixOperator()\n");
if (TopValue->Typ == &Parser->pc->FPType)
{
/* floating point prefix arithmetic */
double ResultFP = 0.0;
switch (Op)
{
case TokenIncrement: ResultFP = ExpressionAssignFP(Parser, TopValue, TopValue->Val->FP+1); break;
case TokenDecrement: ResultFP = ExpressionAssignFP(Parser, TopValue, TopValue->Val->FP-1); break;
default: ProgramFail(Parser, "invalid operation"); break;
}
ExpressionPushFP(Parser, StackTop, ResultFP);
}
else
if (IS_NUMERIC_COERCIBLE(TopValue))
{
long ResultInt = 0;
long TopInt = ExpressionCoerceInteger(TopValue);
switch (Op)
{
case TokenIncrement: ResultInt = ExpressionAssignInt(Parser, TopValue, TopInt+1, TRUE); break;
case TokenDecrement: ResultInt = ExpressionAssignInt(Parser, TopValue, TopInt-1, TRUE); break;
case TokenRightSquareBracket: ProgramFail(Parser, "not supported"); break; /* XXX */
case TokenCloseBracket: ProgramFail(Parser, "not supported"); break; /* XXX */
default: ProgramFail(Parser, "invalid operation"); break;
}
ExpressionPushInt(Parser, StackTop, ResultInt);
}
else if (TopValue->Typ->Base == TypePointer)
{
/* pointer postfix arithmetic */
int Size = TypeSize(TopValue->Typ->FromType, 0, TRUE);
struct Value *StackValue;
void *OrigPointer = TopValue->Val->Pointer;
if (TopValue->Val->Pointer == NULL)
ProgramFail(Parser, "invalid use of a NULL pointer");
if (!TopValue->IsLValue)
ProgramFail(Parser, "can't assign to this");
switch (Op)
{
case TokenIncrement: TopValue->Val->Pointer = (void *)((char *)TopValue->Val->Pointer + Size); break;
case TokenDecrement: TopValue->Val->Pointer = (void *)((char *)TopValue->Val->Pointer - Size); break;
default: ProgramFail(Parser, "invalid operation"); break;
}
StackValue = ExpressionStackPushValueByType(Parser, StackTop, TopValue->Typ);
StackValue->Val->Pointer = OrigPointer;
}
else
ProgramFail(Parser, "invalid operation");
}
/* evaluate an infix operator */
void ExpressionInfixOperator(struct ParseState *Parser, struct ExpressionStack **StackTop, enum LexToken Op, struct Value *BottomValue, struct Value *TopValue)
{
long ResultInt = 0;
struct Value *StackValue;
void *Pointer;
debugf("ExpressionInfixOperator()\n");
if (BottomValue == NULL || TopValue == NULL)
ProgramFail(Parser, "invalid expression");
if (Op == TokenLeftSquareBracket)
{
/* array index */
int ArrayIndex;
struct Value *Result = NULL;
if (!IS_NUMERIC_COERCIBLE(TopValue))
ProgramFail(Parser, "array index must be an integer");
ArrayIndex = ExpressionCoerceInteger(TopValue);
/* make the array element result */
switch (BottomValue->Typ->Base)
{
case TypeArray: Result = VariableAllocValueFromExistingData(Parser, BottomValue->Typ->FromType, (union AnyValue *)(&BottomValue->Val->ArrayMem[0] + TypeSize(BottomValue->Typ, ArrayIndex, TRUE)), BottomValue->IsLValue, BottomValue->LValueFrom); break;
case TypePointer: Result = VariableAllocValueFromExistingData(Parser, BottomValue->Typ->FromType, (union AnyValue *)((char *)BottomValue->Val->Pointer + TypeSize(BottomValue->Typ->FromType, 0, TRUE) * ArrayIndex), BottomValue->IsLValue, BottomValue->LValueFrom); break;
default: ProgramFail(Parser, "this %t is not an array", BottomValue->Typ);
}
ExpressionStackPushValueNode(Parser, StackTop, Result);
}
else if (Op == TokenQuestionMark)
ExpressionQuestionMarkOperator(Parser, StackTop, TopValue, BottomValue);
else if (Op == TokenColon)
ExpressionColonOperator(Parser, StackTop, TopValue, BottomValue);
else if ( (TopValue->Typ == &Parser->pc->FPType && BottomValue->Typ == &Parser->pc->FPType) ||
(TopValue->Typ == &Parser->pc->FPType && IS_NUMERIC_COERCIBLE(BottomValue)) ||
(IS_NUMERIC_COERCIBLE(TopValue) && BottomValue->Typ == &Parser->pc->FPType) )
{
/* floating point infix arithmetic */
int ResultIsInt = FALSE;
double ResultFP = 0.0;
double TopFP = (TopValue->Typ == &Parser->pc->FPType) ? TopValue->Val->FP : (double)ExpressionCoerceInteger(TopValue);
double BottomFP = (BottomValue->Typ == &Parser->pc->FPType) ? BottomValue->Val->FP : (double)ExpressionCoerceInteger(BottomValue);
switch (Op)
{
case TokenAssign: ASSIGN_FP_OR_INT(TopFP); break;
case TokenAddAssign: ASSIGN_FP_OR_INT(BottomFP + TopFP); break;
case TokenSubtractAssign: ASSIGN_FP_OR_INT(BottomFP - TopFP); break;
case TokenMultiplyAssign: ASSIGN_FP_OR_INT(BottomFP * TopFP); break;
case TokenDivideAssign: ASSIGN_FP_OR_INT(BottomFP / TopFP); break;
case TokenEqual: ResultInt = BottomFP == TopFP; ResultIsInt = TRUE; break;
case TokenNotEqual: ResultInt = BottomFP != TopFP; ResultIsInt = TRUE; break;
case TokenLessThan: ResultInt = BottomFP < TopFP; ResultIsInt = TRUE; break;
case TokenGreaterThan: ResultInt = BottomFP > TopFP; ResultIsInt = TRUE; break;
case TokenLessEqual: ResultInt = BottomFP <= TopFP; ResultIsInt = TRUE; break;
case TokenGreaterEqual: ResultInt = BottomFP >= TopFP; ResultIsInt = TRUE; break;
case TokenPlus: ResultFP = BottomFP + TopFP; break;
case TokenMinus: ResultFP = BottomFP - TopFP; break;
case TokenAsterisk: ResultFP = BottomFP * TopFP; break;
case TokenSlash: ResultFP = BottomFP / TopFP; break;
default: ProgramFail(Parser, "invalid operation"); break;
}
if (ResultIsInt)
ExpressionPushInt(Parser, StackTop, ResultInt);
else
ExpressionPushFP(Parser, StackTop, ResultFP);
}
else if (IS_NUMERIC_COERCIBLE(TopValue) && IS_NUMERIC_COERCIBLE(BottomValue))
{
/* integer operation */
long TopInt = ExpressionCoerceInteger(TopValue);
long BottomInt = ExpressionCoerceInteger(BottomValue);
switch (Op)
{
case TokenAssign: ResultInt = ExpressionAssignInt(Parser, BottomValue, TopInt, FALSE); break;
case TokenAddAssign: ResultInt = ExpressionAssignInt(Parser, BottomValue, BottomInt + TopInt, FALSE); break;
case TokenSubtractAssign: ResultInt = ExpressionAssignInt(Parser, BottomValue, BottomInt - TopInt, FALSE); break;
case TokenMultiplyAssign: ResultInt = ExpressionAssignInt(Parser, BottomValue, BottomInt * TopInt, FALSE); break;
case TokenDivideAssign: ResultInt = ExpressionAssignInt(Parser, BottomValue, BottomInt / TopInt, FALSE); break;
#ifndef NO_MODULUS
case TokenModulusAssign: ResultInt = ExpressionAssignInt(Parser, BottomValue, BottomInt % TopInt, FALSE); break;
#endif
case TokenShiftLeftAssign: ResultInt = ExpressionAssignInt(Parser, BottomValue, BottomInt << TopInt, FALSE); break;
case TokenShiftRightAssign: ResultInt = ExpressionAssignInt(Parser, BottomValue, BottomInt >> TopInt, FALSE); break;
case TokenArithmeticAndAssign: ResultInt = ExpressionAssignInt(Parser, BottomValue, BottomInt & TopInt, FALSE); break;
case TokenArithmeticOrAssign: ResultInt = ExpressionAssignInt(Parser, BottomValue, BottomInt | TopInt, FALSE); break;
case TokenArithmeticExorAssign: ResultInt = ExpressionAssignInt(Parser, BottomValue, BottomInt ^ TopInt, FALSE); break;
case TokenLogicalOr: ResultInt = BottomInt || TopInt; break;
case TokenLogicalAnd: ResultInt = BottomInt && TopInt; break;
case TokenArithmeticOr: ResultInt = BottomInt | TopInt; break;
case TokenArithmeticExor: ResultInt = BottomInt ^ TopInt; break;
case TokenAmpersand: ResultInt = BottomInt & TopInt; break;
case TokenEqual: ResultInt = BottomInt == TopInt; break;
case TokenNotEqual: ResultInt = BottomInt != TopInt; break;
case TokenLessThan: ResultInt = BottomInt < TopInt; break;
case TokenGreaterThan: ResultInt = BottomInt > TopInt; break;
case TokenLessEqual: ResultInt = BottomInt <= TopInt; break;
case TokenGreaterEqual: ResultInt = BottomInt >= TopInt; break;
case TokenShiftLeft: ResultInt = BottomInt << TopInt; break;
case TokenShiftRight: ResultInt = BottomInt >> TopInt; break;
case TokenPlus: ResultInt = BottomInt + TopInt; break;
case TokenMinus: ResultInt = BottomInt - TopInt; break;
case TokenAsterisk: ResultInt = BottomInt * TopInt; break;
case TokenSlash: ResultInt = BottomInt / TopInt; break;
#ifndef NO_MODULUS
case TokenModulus: ResultInt = BottomInt % TopInt; break;
#endif
default: ProgramFail(Parser, "invalid operation"); break;
}
ExpressionPushInt(Parser, StackTop, ResultInt);
}
else if (BottomValue->Typ->Base == TypePointer && IS_NUMERIC_COERCIBLE(TopValue))
{
/* pointer/integer infix arithmetic */
long TopInt = ExpressionCoerceInteger(TopValue);
if (Op == TokenEqual || Op == TokenNotEqual)
{
/* comparison to a NULL pointer */
if (TopInt != 0)
ProgramFail(Parser, "invalid operation");
if (Op == TokenEqual)
ExpressionPushInt(Parser, StackTop, BottomValue->Val->Pointer == NULL);
else
ExpressionPushInt(Parser, StackTop, BottomValue->Val->Pointer != NULL);
}
else if (Op == TokenPlus || Op == TokenMinus)
{
/* pointer arithmetic */
int Size = TypeSize(BottomValue->Typ->FromType, 0, TRUE);
Pointer = BottomValue->Val->Pointer;
if (Pointer == NULL)
ProgramFail(Parser, "invalid use of a NULL pointer");
if (Op == TokenPlus)
Pointer = (void *)((char *)Pointer + TopInt * Size);
else
Pointer = (void *)((char *)Pointer - TopInt * Size);
StackValue = ExpressionStackPushValueByType(Parser, StackTop, BottomValue->Typ);
StackValue->Val->Pointer = Pointer;
}
else if (Op == TokenAssign && TopInt == 0)
{
/* assign a NULL pointer */
HeapUnpopStack(Parser->pc, sizeof(struct Value));
ExpressionAssign(Parser, BottomValue, TopValue, FALSE, NULL, 0, FALSE);
ExpressionStackPushValueNode(Parser, StackTop, BottomValue);
}
else if (Op == TokenAddAssign || Op == TokenSubtractAssign)
{
/* pointer arithmetic */
int Size = TypeSize(BottomValue->Typ->FromType, 0, TRUE);
Pointer = BottomValue->Val->Pointer;
if (Pointer == NULL)
ProgramFail(Parser, "invalid use of a NULL pointer");
if (Op == TokenAddAssign)
Pointer = (void *)((char *)Pointer + TopInt * Size);
else
Pointer = (void *)((char *)Pointer - TopInt * Size);
HeapUnpopStack(Parser->pc, sizeof(struct Value));
BottomValue->Val->Pointer = Pointer;
ExpressionStackPushValueNode(Parser, StackTop, BottomValue);
}
else
ProgramFail(Parser, "invalid operation");
}
else if (BottomValue->Typ->Base == TypePointer && TopValue->Typ->Base == TypePointer && Op != TokenAssign)
{
/* pointer/pointer operations */
char *TopLoc = (char *)TopValue->Val->Pointer;
char *BottomLoc = (char *)BottomValue->Val->Pointer;
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 */
HeapUnpopStack(Parser->pc, sizeof(struct Value)); /* XXX - possible bug if lvalue is a temp value and takes more than sizeof(struct Value) */
ExpressionAssign(Parser, BottomValue, TopValue, FALSE, NULL, 0, FALSE);
ExpressionStackPushValueNode(Parser, StackTop, BottomValue);
}
else if (Op == TokenCast)
{
/* cast a value to a different type */ /* XXX - possible bug if the destination type takes more than sizeof(struct Value) + sizeof(struct ValueType *) */
struct Value *ValueLoc = ExpressionStackPushValueByType(Parser, StackTop, BottomValue->Val->Typ);
ExpressionAssign(Parser, ValueLoc, TopValue, TRUE, NULL, 0, TRUE);
}
else
ProgramFail(Parser, "invalid operation");
}
/* take the contents of the expression stack and compute the top until there's nothing greater than the given precedence */
void ExpressionStackCollapse(struct ParseState *Parser, struct ExpressionStack **StackTop, int Precedence, int *IgnorePrecedence)
{
int FoundPrecedence = Precedence;
struct Value *TopValue;
struct Value *BottomValue;
struct ExpressionStack *TopStackNode = *StackTop;
struct ExpressionStack *TopOperatorNode;
debugf("ExpressionStackCollapse(%d):\n", Precedence);
#ifdef DEBUG_EXPRESSIONS
ExpressionStackShow(Parser->pc, *StackTop);
#endif
while (TopStackNode != NULL && TopStackNode->Next != NULL && FoundPrecedence >= Precedence)
{
/* find the top operator on the stack */
if (TopStackNode->Order == OrderNone)
TopOperatorNode = TopStackNode->Next;
else
TopOperatorNode = TopStackNode;
FoundPrecedence = TopOperatorNode->Precedence;
/* does it have a high enough precedence? */
if (FoundPrecedence >= Precedence && TopOperatorNode != NULL)
{
/* execute this operator */
switch (TopOperatorNode->Order)
{
case OrderPrefix:
/* prefix evaluation */
debugf("prefix evaluation\n");
TopValue = TopStackNode->Val;
/* pop the value and then the prefix operator - assume they'll still be there until we're done */
HeapPopStack(Parser->pc, NULL, sizeof(struct ExpressionStack) + sizeof(struct Value) + TypeStackSizeValue(TopValue));
HeapPopStack(Parser->pc, TopOperatorNode, sizeof(struct ExpressionStack));
*StackTop = TopOperatorNode->Next;
/* do the prefix operation */
if (Parser->Mode == RunModeRun /* && FoundPrecedence < *IgnorePrecedence */)
{
/* run the operator */
ExpressionPrefixOperator(Parser, StackTop, TopOperatorNode->Op, TopValue);
}
else
{
/* we're not running it so just return 0 */
ExpressionPushInt(Parser, StackTop, 0);
}
break;
case OrderPostfix:
/* postfix evaluation */
debugf("postfix evaluation\n");
TopValue = TopStackNode->Next->Val;
/* pop the postfix operator and then the value - assume they'll still be there until we're done */
HeapPopStack(Parser->pc, NULL, sizeof(struct ExpressionStack));
HeapPopStack(Parser->pc, TopValue, sizeof(struct ExpressionStack) + sizeof(struct Value) + TypeStackSizeValue(TopValue));
*StackTop = TopStackNode->Next->Next;
/* do the postfix operation */
if (Parser->Mode == RunModeRun /* && FoundPrecedence < *IgnorePrecedence */)
{
/* run the operator */
ExpressionPostfixOperator(Parser, StackTop, TopOperatorNode->Op, TopValue);
}
else
{
/* we're not running it so just return 0 */
ExpressionPushInt(Parser, StackTop, 0);
}
break;
case OrderInfix:
/* infix evaluation */
debugf("infix evaluation\n");
TopValue = TopStackNode->Val;
if (TopValue != NULL)
{
BottomValue = TopOperatorNode->Next->Val;
/* pop a value, the operator and another value - assume they'll still be there until we're done */
HeapPopStack(Parser->pc, NULL, sizeof(struct ExpressionStack) + sizeof(struct Value) + TypeStackSizeValue(TopValue));
HeapPopStack(Parser->pc, NULL, sizeof(struct ExpressionStack));
HeapPopStack(Parser->pc, BottomValue, sizeof(struct ExpressionStack) + sizeof(struct Value) + TypeStackSizeValue(BottomValue));
*StackTop = TopOperatorNode->Next->Next;
/* do the infix operation */
if (Parser->Mode == RunModeRun /* && FoundPrecedence <= *IgnorePrecedence */)
{
/* run the operator */
ExpressionInfixOperator(Parser, StackTop, TopOperatorNode->Op, BottomValue, TopValue);
}
else
{
/* we're not running it so just return 0 */
ExpressionPushInt(Parser, StackTop, 0);
}
}
else
FoundPrecedence = -1;
break;
case OrderNone:
/* this should never happen */
assert(TopOperatorNode->Order != OrderNone);
break;
}
/* if we've returned above the ignored precedence level turn ignoring off */
if (FoundPrecedence <= *IgnorePrecedence)
*IgnorePrecedence = DEEP_PRECEDENCE;
}
#ifdef DEBUG_EXPRESSIONS
ExpressionStackShow(Parser->pc, *StackTop);
#endif
TopStackNode = *StackTop;
}
debugf("ExpressionStackCollapse() finished\n");
#ifdef DEBUG_EXPRESSIONS
ExpressionStackShow(Parser->pc, *StackTop);
#endif
}
/* push an operator on to the expression stack */