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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"
#include "stats.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 long)(value), false); \
ResultIsInt = true; }
#define DEEP_PRECEDENCE (BRACKET_PRECEDENCE*1000)
/* 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 */
unsigned short 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, ")"}
};
#ifdef DEBUG_EXPRESSIONS
static void ExpressionStackShow(Picoc *pc, struct ExpressionStack *StackTop);
#endif
static int IsTypeToken(struct ParseState * Parser, enum LexToken t, struct Value * LexValue);
static long long ExpressionAssignInt(struct ParseState *Parser, struct Value *DestValue, long long FromInt, int After);
static double ExpressionAssignFP(struct ParseState *Parser, struct Value *DestValue, double FromFP);
static void ExpressionStackPushValueNode(struct ParseState *Parser, struct ExpressionStack **StackTop, struct Value *ValueLoc);
static struct Value *ExpressionStackPushValueByType(struct ParseState *Parser, struct ExpressionStack **StackTop, struct ValueType *PushType);
static void ExpressionStackPushValue(struct ParseState *Parser, struct ExpressionStack **StackTop, struct Value *PushValue);
static void ExpressionStackPushLValue(struct ParseState *Parser, struct ExpressionStack **StackTop, struct Value *PushValue, int Offset);
static void ExpressionStackPushDereference(struct ParseState *Parser, struct ExpressionStack **StackTop, struct Value *DereferenceValue);
static void ExpressionPushInt(struct ParseState *Parser, struct ExpressionStack **StackTop, long long IntValue);
static void ExpressionPushFloat(struct ParseState *Parser, struct ExpressionStack **StackTop, float FPValue);
static void ExpressionPushDouble(struct ParseState *Parser, struct ExpressionStack **StackTop, double FPValue);
static void ExpressionAssignToPointer(struct ParseState *Parser, struct Value *ToValue, struct Value *FromValue, const char *FuncName, int ParamNo, int AllowPointerCoercion);
static void ExpressionQuestionMarkOperator(struct ParseState *Parser, struct ExpressionStack **StackTop, struct Value *BottomValue, struct Value *TopValue);
static void ExpressionColonOperator(struct ParseState *Parser, struct ExpressionStack **StackTop, struct Value *BottomValue, struct Value *TopValue);
static void ExpressionPrefixOperator(struct ParseState *Parser, struct ExpressionStack **StackTop, enum LexToken Op, struct Value *TopValue);
static void ExpressionPostfixOperator(struct ParseState *Parser, struct ExpressionStack **StackTop, enum LexToken Op, struct Value *TopValue);
static void ExpressionInfixOperator(struct ParseState *Parser, struct ExpressionStack **StackTop, enum LexToken Op, struct Value *BottomValue, struct Value *TopValue);
static void ExpressionStackCollapse(struct ParseState *Parser, struct ExpressionStack **StackTop, int Precedence, int *IgnorePrecedence);
static void ExpressionStackPushOperator(struct ParseState *Parser, struct ExpressionStack **StackTop, enum OperatorOrder Order, enum LexToken Token, int Precedence);
static void ExpressionParseMacroCall(struct ParseState *Parser, struct ExpressionStack **StackTop, const char *MacroName, struct MacroDef *MDef);
static 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 long)pc->HeapStackTop, (long 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 TypeLongLong:
printf("%lld:long long", StackTop->Val->Val->LongLongInteger);
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 TypeUnsignedLongLong:
printf("%lld:unsigned long long", StackTop->Val->Val->UnsignedLongLongInteger);
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 long ExpressionCoerceInteger(struct Value *Val)
{
switch (Val->Typ->Base) {
case TypeInt:
return (long long)Val->Val->Integer;
case TypeChar:
return (long long)Val->Val->Character;
case TypeShort:
return (long long)Val->Val->ShortInteger;
case TypeLong:
return (long long)Val->Val->LongInteger;
case TypeLongLong:
return (long long)Val->Val->LongLongInteger;
case TypeUnsignedInt:
return (long long)Val->Val->UnsignedInteger;
case TypeUnsignedShort:
return (long long)Val->Val->UnsignedShortInteger;
case TypeUnsignedLong:
return (long long)Val->Val->UnsignedLongInteger;
case TypeUnsignedLongLong:
return (long long)Val->Val->UnsignedLongLongInteger;
case TypeUnsignedChar:
return (long long)Val->Val->UnsignedCharacter;
case TypePointer:
return (long long)Val->Val->Pointer;
case TypeFloat:
return (long long)Val->Val->Float;
case TypeDouble:
return (long long)Val->Val->Double;
default:
return 0;
}
}
unsigned long long ExpressionCoerceUnsignedInteger(struct Value *Val)
{
switch (Val->Typ->Base) {
case TypeInt:
return (unsigned long long)Val->Val->Integer;
case TypeChar:
return (unsigned long long)Val->Val->Character;
case TypeShort:
return (unsigned long long)Val->Val->ShortInteger;
case TypeLong:
return (unsigned long long)Val->Val->LongInteger;
case TypeLongLong:
return (unsigned long long)Val->Val->LongLongInteger;
case TypeUnsignedInt:
return (unsigned long long)Val->Val->UnsignedInteger;
case TypeUnsignedShort:
return (unsigned long long)Val->Val->UnsignedShortInteger;
case TypeUnsignedLong:
return (unsigned long)Val->Val->UnsignedLongInteger;
case TypeUnsignedLongLong:
return (unsigned long long)Val->Val->UnsignedLongLongInteger;
case TypeUnsignedChar:
return (unsigned long long)Val->Val->UnsignedCharacter;
case TypePointer:
return (unsigned long long)Val->Val->Pointer;
case TypeFloat:
return (unsigned long long)Val->Val->Float;
case TypeDouble:
return (unsigned long long)Val->Val->Double;
default:
return 0;
}
}
double ExpressionCoerceFP(struct Value *Val)
{
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 TypeLongLong:
return (double)Val->Val->LongLongInteger;
case TypeUnsignedInt:
return (double)Val->Val->UnsignedInteger;
case TypeUnsignedShort:
return (double)Val->Val->UnsignedShortInteger;
case TypeUnsignedLong:
return (double)Val->Val->UnsignedLongInteger;
case TypeUnsignedLongLong:
return (double)Val->Val->UnsignedLongLongInteger;
case TypeUnsignedChar:
return (double)Val->Val->UnsignedCharacter;
case TypeFloat:
return (double)Val->Val->Float;
case TypeDouble:
return Val->Val->Double;
default:
return 0.0;
}
}
/* assign an integer value */
long long ExpressionAssignInt(struct ParseState *Parser, struct Value *DestValue,
long long FromInt, int After)
{
long 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 = (int)FromInt;
stats_log_assignment(Parser, STATS_TYPE_Int);
break;
case TypeShort:
DestValue->Val->ShortInteger = (short)FromInt;
stats_log_assignment(Parser, STATS_TYPE_Short);
break;
case TypeChar:
DestValue->Val->Character = (char)FromInt;
stats_log_assignment(Parser, STATS_TYPE_Char);
break;
case TypeLong:
DestValue->Val->LongInteger = (long)FromInt;
stats_log_assignment(Parser, STATS_TYPE_Long);
break;
case TypeLongLong:
DestValue->Val->LongLongInteger = (long long)FromInt;
stats_log_assignment(Parser, STATS_TYPE_LongLong);
break;
case TypeUnsignedInt:
DestValue->Val->UnsignedInteger = (unsigned int)FromInt;
stats_log_assignment(Parser, STATS_TYPE_UnsignedInt);
break;
case TypeUnsignedShort:
DestValue->Val->UnsignedShortInteger = (unsigned short)FromInt;
stats_log_assignment(Parser, STATS_TYPE_UnsignedShort);
break;
case TypeUnsignedLong:
DestValue->Val->UnsignedLongInteger = (unsigned long)FromInt;
stats_log_assignment(Parser, STATS_TYPE_UnsignedLong);
break;
case TypeUnsignedLongLong:
DestValue->Val->UnsignedLongLongInteger = (unsigned long long)FromInt;
stats_log_assignment(Parser, STATS_TYPE_UnsignedLongLong);
break;
case TypeUnsignedChar:
DestValue->Val->UnsignedCharacter = (unsigned char)FromInt;
stats_log_assignment(Parser, STATS_TYPE_UnsignedChar);
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");
switch (DestValue->Typ->Base) {
case TypeFloat:
DestValue->Val->Float = (float) FromFP;
stats_log_assignment(Parser, STATS_TYPE_Float);
break;
case TypeDouble:
DestValue->Val->Double = FromFP;
stats_log_assignment(Parser, STATS_TYPE_Double);
break;
default:
break;
}
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(*StackNode), 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)
{
int Offset;
int DerefIsLValue;
struct Value *DerefVal;
struct Value *ValueLoc;
struct ValueType *DerefType;
void *DerefDataLoc = VariableDereferencePointer(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 long IntValue)
{
struct Value *ValueLoc = VariableAllocValueFromType(Parser->pc, Parser,
&Parser->pc->LongLongType, false, NULL, false);
// jdp: an ugly hack to a) assign the correct value and b) properly print long values
ValueLoc->Val->UnsignedLongLongInteger = (unsigned long long)IntValue;
ValueLoc->Val->LongLongInteger = (long long)IntValue;
ValueLoc->Val->UnsignedLongInteger = (unsigned long)IntValue;
ValueLoc->Val->LongInteger = (long)IntValue;
ValueLoc->Val->Integer = (int)IntValue;
ValueLoc->Val->ShortInteger = (short)IntValue;
ValueLoc->Val->UnsignedShortInteger = (unsigned short)IntValue;
ValueLoc->Val->UnsignedInteger = (unsigned int)IntValue;
ValueLoc->Val->UnsignedCharacter = (unsigned char)IntValue;
ValueLoc->Val->Character = (char)IntValue;
ExpressionStackPushValueNode(Parser, StackTop, ValueLoc);
}
void ExpressionPushIntWithType(struct ParseState *Parser,
struct ExpressionStack **StackTop, long long IntValue, enum BaseType Type)
{
struct ValueType *ValType;
struct Value *ValueLoc;
switch (Type) {
case TypeChar:
ValType = &Parser->pc->CharType;
break;
case TypeUnsignedChar:
ValType = &Parser->pc->UnsignedCharType;
break;
case TypeShort:
ValType = &Parser->pc->ShortType;
break;
case TypeUnsignedShort:
ValType = &Parser->pc->UnsignedShortType;
break;
case TypeInt:
ValType = &Parser->pc->IntType;
break;
case TypeUnsignedInt:
ValType = &Parser->pc->UnsignedIntType;
break;
case TypeLong:
ValType = &Parser->pc->LongType;
break;
case TypeUnsignedLong:
ValType = &Parser->pc->UnsignedLongType;
break;
case TypeUnsignedLongLong:
ValType = &Parser->pc->UnsignedLongLongType;
break;
default:
ValType = &Parser->pc->LongLongType;
}
ValueLoc = VariableAllocValueFromType(Parser->pc, Parser, ValType, false, NULL, false);
ValueLoc->Val->LongLongInteger = 0;
switch (Type) {
case TypeChar:
ValueLoc->Val->Character = (char)IntValue;
break;
case TypeUnsignedChar:
ValueLoc->Val->UnsignedCharacter = (unsigned char)IntValue;
break;
case TypeShort:
ValueLoc->Val->ShortInteger = (short)IntValue;
break;
case TypeUnsignedShort:
ValueLoc->Val->UnsignedShortInteger = (unsigned short)IntValue;
break;
case TypeInt:
ValueLoc->Val->Integer = (int)IntValue;
break;
case TypeUnsignedInt:
ValueLoc->Val->UnsignedInteger = (unsigned int)IntValue;
break;
case TypeLong:
ValueLoc->Val->LongInteger = (long)IntValue;
break;
case TypeUnsignedLong:
ValueLoc->Val->UnsignedLongInteger = (unsigned long)IntValue;
break;
case TypeUnsignedLongLong:
ValueLoc->Val->UnsignedLongLongInteger = (unsigned long long)IntValue;
break;
default:
ValueLoc->Val->LongLongInteger = IntValue;
}
ExpressionStackPushValueNode(Parser, StackTop, ValueLoc);
}
void ExpressionPushFloat(struct ParseState *Parser,
struct ExpressionStack **StackTop, float FPValue)
{
struct Value *ValueLoc = VariableAllocValueFromType(Parser->pc, Parser,
&Parser->pc->FloatType, false, NULL, false);
ValueLoc->Val->Float = FPValue;
ExpressionStackPushValueNode(Parser, StackTop, ValueLoc);
}
void ExpressionPushDouble(struct ParseState *Parser,
struct ExpressionStack **StackTop, double FPValue)
{
struct Value *ValueLoc = VariableAllocValueFromType(Parser->pc, Parser,
&Parser->pc->DoubleType, false, NULL, false);
ValueLoc->Val->Double = 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 */
stats_log_assignment(Parser, STATS_TYPE_Pointer);
}
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];
stats_log_assignment(Parser, STATS_TYPE_Pointer);
} 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(FromValue, NULL,
NULL, NULL, NULL);
stats_log_assignment(Parser, STATS_TYPE_Pointer);
} else if (IS_NUMERIC_COERCIBLE(FromValue) &&
ExpressionCoerceInteger(FromValue) == 0) {
/* null pointer assignment */
ToValue->Val->Pointer = NULL;
stats_log_assignment(Parser, STATS_TYPE_Pointer);
} else if (AllowPointerCoercion && IS_NUMERIC_COERCIBLE(FromValue)) {
/* assign integer to native pointer */
ToValue->Val->Pointer =
(void*)(unsigned long long)ExpressionCoerceUnsignedInteger(FromValue);
stats_log_assignment(Parser, STATS_TYPE_Pointer);
} else if (AllowPointerCoercion && FromValue->Typ->Base == TypePointer) {
/* assign a pointer to a pointer to a different type */
ToValue->Val->Pointer = FromValue->Val->Pointer;
stats_log_assignment(Parser, STATS_TYPE_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 = (int)ExpressionCoerceInteger(SourceValue);
stats_log_assignment(Parser, STATS_TYPE_Int);
break;
case TypeShort:
DestValue->Val->ShortInteger = (short)ExpressionCoerceInteger(SourceValue);
stats_log_assignment(Parser, STATS_TYPE_Short);
break;
case TypeChar:
DestValue->Val->Character = (char)ExpressionCoerceInteger(SourceValue);
stats_log_assignment(Parser, STATS_TYPE_Char);
break;
case TypeLong:
DestValue->Val->LongInteger = (long)ExpressionCoerceInteger(SourceValue);
stats_log_assignment(Parser, STATS_TYPE_Long);
break;
case TypeLongLong:
DestValue->Val->LongLongInteger = ExpressionCoerceInteger(SourceValue);
stats_log_assignment(Parser, STATS_TYPE_LongLong);
break;
case TypeUnsignedInt:
DestValue->Val->UnsignedInteger =
(unsigned int)ExpressionCoerceUnsignedInteger(SourceValue);
stats_log_assignment(Parser, STATS_TYPE_UnsignedInt);
break;
case TypeUnsignedShort:
DestValue->Val->UnsignedShortInteger =
(unsigned short)ExpressionCoerceUnsignedInteger(SourceValue);
stats_log_assignment(Parser, STATS_TYPE_UnsignedShort);
break;
case TypeUnsignedLong:
DestValue->Val->UnsignedLongInteger =
(unsigned long)ExpressionCoerceUnsignedInteger(SourceValue);
stats_log_assignment(Parser, STATS_TYPE_UnsignedLong);
break;
case TypeUnsignedLongLong:
DestValue->Val->UnsignedLongLongInteger = ExpressionCoerceUnsignedInteger(SourceValue);
stats_log_assignment(Parser, STATS_TYPE_UnsignedLongLong);
break;
case TypeUnsignedChar:
DestValue->Val->UnsignedCharacter =
(unsigned char)ExpressionCoerceUnsignedInteger(SourceValue);
stats_log_assignment(Parser, STATS_TYPE_UnsignedChar);
break;
case TypeFloat:
if (!IS_NUMERIC_COERCIBLE_PLUS_POINTERS(SourceValue, AllowPointerCoercion))
AssignFail(Parser, "%t from %t", DestValue->Typ, SourceValue->Typ,
0, 0, FuncName, ParamNo);
DestValue->Val->Float = (float)ExpressionCoerceFP(SourceValue);
stats_log_assignment(Parser, STATS_TYPE_Float);
break;
case TypeDouble:
if (!IS_NUMERIC_COERCIBLE_PLUS_POINTERS(SourceValue, AllowPointerCoercion))
AssignFail(Parser, "%t from %t", DestValue->Typ, SourceValue->Typ,
0, 0, FuncName, ParamNo);
DestValue->Val->Double = (double)ExpressionCoerceFP(SourceValue);
stats_log_assignment(Parser, STATS_TYPE_Double);
break;
case TypePointer:
ExpressionAssignToPointer(Parser, DestValue, SourceValue, FuncName,
ParamNo, AllowPointerCoercion);
break;
case TypeArray:
if (SourceValue->Typ->Base == TypeArray && 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;
struct ValueType *Typ;
#ifdef DEBUG_EXPRESSIONS
printf("ExpressionPrefixOperator()\n");
#endif
stats_log_expression_evaluation(Parser, ExpressionPrefix, Op, NULL, TopValue);
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:
if(StackTop != NULL && (*StackTop) != NULL && (*StackTop)->Op == TokenSizeof)
/* ignored */
ExpressionStackPushValueByType(Parser, StackTop, TopValue->Typ);
else
ExpressionStackPushDereference(Parser, StackTop, TopValue);
break;
case TokenSizeof:
/* return the size of the argument */
if (TopValue->Typ == &Parser->pc->TypeType)
Typ = TopValue->Val->Typ;
else
Typ = TopValue->Typ;
if (Typ->FromType != NULL && Typ->FromType->Base == TypeStruct)
Typ = Typ->FromType;
ExpressionPushInt(Parser, StackTop, TypeSize(Typ, Typ->ArraySize, true));
break;
default:
/* an arithmetic operator */
if (TopValue->Typ == &Parser->pc->FloatType) {
/* floating point prefix arithmetic */
float ResultFP = 0.0f;
switch (Op) {
case TokenPlus:
ResultFP = TopValue->Val->Float;
break;
case TokenMinus:
ResultFP = -TopValue->Val->Float;
break;
case TokenIncrement:
ResultFP = (float)ExpressionAssignFP(Parser, TopValue,
TopValue->Val->Float+1);
break;
case TokenDecrement:
ResultFP = (float)ExpressionAssignFP(Parser, TopValue,
TopValue->Val->Float-1);
break;
case TokenUnaryNot:
ResultFP = (float)(!TopValue->Val->Float);
break;
default:
ProgramFail(Parser, "invalid operation");
break;
}
ExpressionPushFloat(Parser, StackTop, ResultFP);
} else if (TopValue->Typ == &Parser->pc->DoubleType) {
/* floating point prefix arithmetic */
double ResultFP = 0.0;
switch (Op) {
case TokenPlus:
ResultFP = TopValue->Val->Double;
break;
case TokenMinus:
ResultFP = -TopValue->Val->Double;
break;
case TokenIncrement:
ResultFP = ExpressionAssignFP(Parser, TopValue,
TopValue->Val->Double+1);
break;
case TokenDecrement:
ResultFP = ExpressionAssignFP(Parser, TopValue,
TopValue->Val->Double-1);
break;
case TokenUnaryNot:
ResultFP = !TopValue->Val->Double;
break;
default:
ProgramFail(Parser, "invalid operation");
break;
}
ExpressionPushDouble(Parser, StackTop, ResultFP);
} else if (IS_NUMERIC_COERCIBLE(TopValue)) {
/* integer prefix arithmetic */
long long ResultInt = 0;
long long TopInt = ExpressionCoerceInteger(TopValue);
enum BaseType TopType = TopValue->Typ->Base;
enum BaseType ResultType = TypeLongLong;
int NeedsConversion = false;
switch (Op) {
case TokenPlus:
ResultInt = TopInt;
NeedsConversion = true;
break;
case TokenMinus:
ResultInt = -TopInt;
NeedsConversion = true;
break;
case TokenIncrement:
ResultInt = ExpressionAssignInt(Parser, TopValue,
TopInt+1, false);
NeedsConversion = true;
break;
case TokenDecrement:
ResultInt = ExpressionAssignInt(Parser, TopValue,
TopInt-1, false);
NeedsConversion = true;
break;
case TokenUnaryNot:
ResultInt = !TopInt;
break;
case TokenUnaryExor:
ResultInt = ~TopInt;
break;
default:
ProgramFail(Parser, "invalid operation");
break;
}
/* perform arithmetic type 'conversion' (via a cast) to get the expected value */
/* rules taken from https://en.cppreference.com/w/c/language/conversion */
if (NeedsConversion) {
if (TypeIntRank(TopType) < TypeIntRank(TypeInt))
TopType = TypeInt;
ResultType = TopType;
}
ExpressionPushIntWithType(Parser, StackTop, ResultInt, ResultType);
} else if (TopValue->Typ->Base == TypePointer) {
/* pointer prefix arithmetic */
int Size = TypeSize(TopValue->Typ->FromType, 0, true);
struct Value *StackValue;
void *ResultPtr = 0;
if (Op != TokenUnaryNot && TopValue->Val->Pointer == NULL)
ProgramFail(Parser, "a. invalid use of a NULL pointer");
if (!TopValue->IsLValue)
ProgramFail(Parser, "can't assign to this");
switch (Op) {
case TokenIncrement:
ResultPtr = TopValue->Val->Pointer =
(void*)((char*)TopValue->Val->Pointer+Size);
stats_log_assignment(Parser, STATS_TYPE_Pointer);
break;
case TokenDecrement:
ResultPtr = TopValue->Val->Pointer =
(void*)((char*)TopValue->Val->Pointer-Size);
stats_log_assignment(Parser, STATS_TYPE_Pointer);
break;
case TokenUnaryNot:
/* conditionally checking a pointer's value, we only want
to change the stack value (ResultPtr) and not the pointer's
actual value */
TopValue->Val->Pointer =
(void*)((char*)TopValue->Val->Pointer);
ResultPtr = TopValue->Val->Pointer ? NULL : (void*)0x01;
break;
default: