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interpreter.c
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interpreter.c
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/*
* Project name:
* Implementace interpretu imperativního jazyka IFJ13.
*
* Codename:
* INI: Ni Interpreter
*
* Description:
* https://wis.fit.vutbr.cz/FIT/st/course-files-st.php/course/IFJ-IT/projects/ifj2013.pdf
*
* Project's GitHub repository:
* https://github.com/metthal/IFJ-Projekt
*
* Team:
* Marek Milkovič (xmilko01)
* Lukáš Vrabec (xvrabe07)
* Ján Spišiak (xspisi03)
* Ivan Ševčík (xsevci50)
* Marek Bertovič (xberto00)
*/
#include "interpreter.h"
#include "value_vector.h"
#include "builtin.h"
#include "nierr.h"
#include "interpreter_helpers.h"
#include <stdint.h>
#define DEFAULT_STACK_CAPACITY 5000
void interpretationLoop(const Instruction *firstInstruction, const Vector *constTable, const Vector *addressTable, Vector *stack)
{
// 3 value pointers used during interpretation
Value *resVal;
const Value *aVal, *bVal;
// Stack pointer have to be index because of possibility of stack
// vector reallocation
uint32_t stackPtr = 1;
// Pointer on first constant for fast access
const Value *cCtIt = NULL;
if (vectorSize(constTable) > 0)
cCtIt = vectorAtConst(constTable, 0);
const Instruction *instructionPtr = firstInstruction;
uint8_t running = 1;
while (running) {
switch (instructionPtr->code) {
case IST_Mov: {
// Don't dereference, as we can just move
// reference and update it.
Value *base = vectorFastAtValue(stack, stackPtr);
aVal = base + instructionPtr->a;
// There's exception with WeakReference, which
// must be dereferenced
if (aVal->type == VT_WeakReference)
aVal += aVal->data.ref;
else if (aVal->type == VT_Undefined) {
setError(ERR_UndefVariable);
break;
}
fillResValuePtr(base, &resVal, instructionPtr->res);
if (aVal != resVal) {
deleteValue(resVal);
copyValue(aVal, resVal);
// Reference needs to be updated
if (aVal->type == VT_StrongReference)
resVal->data.ref += (aVal - resVal);
}
break;
}
case IST_MovC:
fillResValuePtr(vectorFastAtValue(stack, stackPtr), &resVal, instructionPtr->res);
resVal->data.ref = instructionPtr->a;
resVal->type = VT_ConstReference;
break;
case IST_Jmp:
instructionPtr += instructionPtr->a;
continue;
case IST_Jmpz: {
if (!fillConstValuePtr(vectorFastAtValue(stack, stackPtr), cCtIt, &bVal,
instructionPtr->b))
break;
uint32_t tempRes = instructionPtr->res;
if (valueToBool(bVal))
instructionPtr++;
else
instructionPtr += instructionPtr->a;
// If valueToBool failed
if (getError())
return;
// Clear space hold by condition's expression
vectorDownsizeValue(stack, stackPtr + tempRes);
continue;
}
case IST_Jmpnz: {
if (!fillConstValuePtr(vectorFastAtValue(stack, stackPtr), cCtIt, &bVal,
instructionPtr->b))
break;
uint32_t tempRes = instructionPtr->res;
if (valueToBool(bVal))
instructionPtr += instructionPtr->a;
else
instructionPtr++;
// If valueToBool failed
if (getError())
return;
// Clear space hold by condition's expression
vectorDownsizeValue(stack, stackPtr + tempRes);
continue;
}
case IST_Push: {
if ((vectorFastAtValue(stack, stackPtr + instructionPtr->a))->type == VT_String) {
resVal = vectorPushDefaultValue(stack);
resVal->data.ref = ((int64_t)stackPtr + instructionPtr->a - (vectorSize(stack) - 1));
resVal->type = VT_WeakReference;
}
else {
// Reference gets updated automatically
resVal = vectorPushIndexValue(stack, stackPtr + instructionPtr->a);
}
break;
}
case IST_PushC:
resVal = vectorPushDefaultValue(stack);
resVal->data.ref = instructionPtr->a;
resVal->type = VT_ConstReference;
break;
case IST_PushRef:
resVal = vectorPushDefaultValue(stack);
aVal = resVal + instructionPtr->a;
switch(aVal->type) {
case VT_StrongReference:
resVal->data.ref = aVal->data.ref + instructionPtr->a;
resVal->type = VT_StrongReference;
break;
default:
resVal->data.ref = instructionPtr->a;
resVal->type = VT_StrongReference;
break;
}
break;
case IST_Reserve:
vectorPushDefaultNValue(stack, instructionPtr->a);
break;
case IST_Pop:
if (instructionPtr->a == 1)
vectorPopValue(stack);
else
vectorPopNValue(stack, instructionPtr->a);
break;
case IST_ClearExpr:
vectorDownsizeValue(stack, stackPtr + instructionPtr->a);
break;
case IST_Call: {
// Stack pointer
Value *val = vectorPushDefaultValue(stack);
val->type = VT_StackPtr;
val->data.sp = stackPtr;
stackPtr = vectorSize(stack) - 1;
// Instruction pointer
val = vectorPushDefaultValue(stack);
val->type = VT_InstructionPtr;
val->data.ip = instructionPtr + 1;
// Condition reserved
vectorPushDefaultValue(stack);
instructionPtr = *((Instruction**)vectorAtConst(addressTable, instructionPtr->a));
continue;
}
case IST_Return:
// Load old instruction pointer
aVal = vectorFastAtValue(stack, stackPtr + 1);
uint32_t paramCount = instructionPtr->a;
if (aVal->type == VT_Null) {
// End interpretation
running = 0;
return;
}
else
instructionPtr = aVal->data.ip;
// Load old stack pointer
uint32_t oldStackPtr = stackPtr;
aVal = vectorFastAtValue(stack, stackPtr);
stackPtr = aVal->data.sp;
vectorDownsizeValue(stack, oldStackPtr - paramCount);
continue;
case IST_Nullify:
fillResValuePtr(vectorFastAtValue(stack, stackPtr), &resVal, instructionPtr->a);
deleteValue(resVal);
initValue(resVal);
resVal->type = VT_Null;
break;
case IST_BoolVal: {
if (!fillResConstValuePtr(vectorEndValue(stack), cCtIt, &resVal, &aVal,
-2, -1))
break;
boolval(aVal, resVal);
// Clear parameters
vectorPopValue(stack);
break;
}
case IST_DoubleVal: {
if (!fillResConstValuePtr(vectorEndValue(stack), cCtIt, &resVal, &aVal,
-2, -1))
break;
doubleval(aVal, resVal);
// Clear parameters
vectorPopValue(stack);
break;
}
case IST_FindString: {
Value *base = vectorEndValue(stack);
fillResValuePtr(base, &resVal, -3);
if (!fillConstValuePtrs(base, cCtIt, &aVal, &bVal,
-2, -1))
break;
findString(resVal, aVal, bVal);
// Clear parameters
vectorPopNValue(stack, 2);
break;
}
case IST_GetString: {
fillResValuePtr(vectorEndValue(stack), &resVal, -1);
getString(resVal);
break;
}
case IST_GetSubstring: {
if (!fillConstValuePtrs(vectorEndValue(stack), cCtIt, &aVal, &bVal,
-2, -1))
break;
int start = valueToInt(aVal);
int end = valueToInt(bVal);
if (getError())
return;
if (!fillResConstValuePtr(vectorEndValue(stack), cCtIt, &resVal, &aVal,
-4, -3))
break;
getSubstring(aVal, resVal, start, end);
// Clear parameters
vectorPopNValue(stack, 3);
break;
}
case IST_IntVal: {
if (!fillResConstValuePtr(vectorEndValue(stack), cCtIt, &resVal, &aVal,
-2, -1))
break;
intval(aVal, resVal);
// Clear parameters
vectorPopValue(stack);
break;
}
case IST_PutString: {
Value *base = vectorEndValue(stack);
fillResValuePtr(base, &resVal, -instructionPtr->a - 1);
putString(base, cCtIt, resVal, instructionPtr->a);
// Clear parameters
vectorPopNValue(stack, instructionPtr->a);
break;
}
case IST_SortString: {
if (!fillResConstValuePtr(vectorEndValue(stack), cCtIt, &resVal, &aVal,
-2, -1))
break;
sortString(aVal, resVal);
// Clear parameters
vectorPopValue(stack);
break;
}
case IST_StrLen: {
if (!fillResConstValuePtr(vectorEndValue(stack), cCtIt, &resVal, &aVal,
-2, -1))
break;
strLen(aVal, resVal);
// Clear parameters
vectorPopValue(stack);
break;
}
case IST_StrVal: {
if (!fillResConstValuePtr(vectorEndValue(stack), cCtIt, &resVal, &aVal,
-2, -1))
break;
strval(aVal, resVal);
// Clear parameters
vectorPopValue(stack);
break;
}
case IST_Add:
if (stackPtr + instructionPtr->res >= vectorSize(stack))
vectorPushDefaultValue(stack);
if (!fillValuePtrs(vectorFastAtValue(stack, stackPtr), cCtIt, &resVal, &aVal, &bVal,
instructionPtr))
break;
if (aVal->type == VT_Integer) {
if (bVal->type == VT_Integer) {
resVal->data.i = aVal->data.i + bVal->data.i;
resVal->type = VT_Integer;
}
else if (bVal->type == VT_Double) {
resVal->data.d = aVal->data.i + bVal->data.d;
resVal->type = VT_Double;
}
else
setError(ERR_OperandTypes);
break;
}
else if (aVal->type == VT_Double) {
if (bVal->type == VT_Integer) {
resVal->data.d = aVal->data.d + bVal->data.i;
resVal->type = VT_Double;
}
else if (bVal->type == VT_Double) {
resVal->data.d = aVal->data.d + bVal->data.d;
resVal->type = VT_Double;
}
else
setError(ERR_OperandTypes);
break;
}
else
setError(ERR_OperandTypes);
break;
case IST_Subtract:
if (stackPtr + instructionPtr->res >= vectorSize(stack))
vectorPushDefaultValue(stack);
if (!fillValuePtrs(vectorFastAtValue(stack, stackPtr), cCtIt, &resVal, &aVal, &bVal,
instructionPtr))
break;
if (aVal->type == VT_Integer) {
if (bVal->type == VT_Integer) {
resVal->data.i = aVal->data.i - bVal->data.i;
resVal->type = VT_Integer;
}
else if (bVal->type == VT_Double) {
resVal->data.d = aVal->data.i - bVal->data.d;
resVal->type = VT_Double;
}
else
setError(ERR_OperandTypes);
break;
}
else if (aVal->type == VT_Double) {
if (bVal->type == VT_Integer) {
resVal->data.d = aVal->data.d - bVal->data.i;
resVal->type = VT_Double;
}
else if (bVal->type == VT_Double) {
resVal->data.d = aVal->data.d - bVal->data.d;
resVal->type = VT_Double;
}
else
setError(ERR_OperandTypes);
break;
}
else
setError(ERR_OperandTypes);
break;
case IST_Multiply:
if (stackPtr + instructionPtr->res >= vectorSize(stack))
vectorPushDefaultValue(stack);
if (!fillValuePtrs(vectorFastAtValue(stack, stackPtr), cCtIt, &resVal, &aVal, &bVal,
instructionPtr))
break;
if (aVal->type == VT_Integer) {
if (bVal->type == VT_Integer) {
resVal->data.i = aVal->data.i * bVal->data.i;
resVal->type = VT_Integer;
}
else if (bVal->type == VT_Double) {
resVal->data.d = aVal->data.i * bVal->data.d;
resVal->type = VT_Double;
}
else
setError(ERR_OperandTypes);
break;
}
else if (aVal->type == VT_Double) {
if (bVal->type == VT_Integer) {
resVal->data.d = aVal->data.d * bVal->data.i;
resVal->type = VT_Double;
}
else if (bVal->type == VT_Double) {
resVal->data.d = aVal->data.d * bVal->data.d;
resVal->type = VT_Double;
}
else
setError(ERR_OperandTypes);
break;
}
else
setError(ERR_OperandTypes);
break;
case IST_Divide:
if (stackPtr + instructionPtr->res >= vectorSize(stack))
vectorPushDefaultValue(stack);
if (!fillValuePtrs(vectorFastAtValue(stack, stackPtr), cCtIt, &resVal, &aVal, &bVal,
instructionPtr))
break;
if (bVal->type == VT_Integer) {
if (bVal->data.i == 0) {
setError(ERR_DivideByZero);
break;
}
if (aVal->type == VT_Integer) {
resVal->data.d = (double)aVal->data.i / (double)bVal->data.i;
resVal->type = VT_Double;
}
else if (aVal->type == VT_Double) {
resVal->data.d = aVal->data.d / (double)bVal->data.i;
resVal->type = VT_Double;
}
else
setError(ERR_OperandTypes);
break;
}
else if (bVal->type == VT_Double) {
if (bVal->data.d == 0.0) {
setError(ERR_DivideByZero);
break;
}
if (aVal->type == VT_Integer) {
resVal->data.d = (double)aVal->data.i / bVal->data.d;
resVal->type = VT_Double;
}
else if (aVal->type == VT_Double) {
resVal->data.d = aVal->data.d / bVal->data.d;
resVal->type = VT_Double;
}
else
setError(ERR_OperandTypes);
break;
}
else
setError(ERR_OperandTypes);
break;
case IST_Concat:
if (stackPtr + instructionPtr->res >= vectorSize(stack))
vectorPushDefaultValue(stack);
if (!fillValuePtrs(vectorFastAtValue(stack, stackPtr), cCtIt, &resVal, &aVal, &bVal,
instructionPtr))
break;
// Test if first operand is string
if (aVal->type != VT_String) {
setError(ERR_OperandTypes);
break;
}
// If resVal == aVal, we can just add bVal
if (resVal != aVal) {
if (resVal == bVal && bVal->type == VT_String) {
// Special case, aVal can be just added before resVal == bVal
stringFrontAdd(&(resVal->data.s), &(aVal->data.s));
break;
}
}
// Add bVal, thus concatenating
if (bVal->type == VT_String) {
// Initialize result if it's not already set to aVal
if (resVal != aVal) {
deleteValue(resVal);
initStringSet(&(resVal->data.s), &(aVal->data.s));
}
// This will work even if resVal == aVal == bVal
stringAdd(&(resVal->data.s), &(bVal->data.s));
}
else {
// First, bVal needs to be converted
String tmp;
valueToString(bVal, &tmp);
if (getError())
return;
// Then, having temporary string, we can initialize resVal
// but only if it's not aVal
if (resVal != aVal) {
deleteValue(resVal);
initStringSet(&(resVal->data.s), &(aVal->data.s));
}
// And perform concatenation
stringAdd(&(resVal->data.s), &tmp);
// Finally, delete temporary string
deleteString(&tmp);
}
resVal->type = VT_String;
break;
case IST_Equal:
if (stackPtr + instructionPtr->res >= vectorSize(stack))
vectorPushDefaultValue(stack);
if (!fillValuePtrs(vectorFastAtValue(stack, stackPtr), cCtIt, &resVal, &aVal, &bVal,
instructionPtr))
break;
if (aVal->type == bVal->type ) {
switch (aVal->type) {
case VT_Integer:
resVal->data.b = aVal->data.i == bVal->data.i;
resVal->type = VT_Bool;
break;
case VT_Double:
resVal->data.b = aVal->data.d == bVal->data.d;
resVal->type = VT_Bool;
break;
case VT_String: {
uint8_t tmp = stringCompare(&aVal->data.s, &bVal->data.s) == 0;
deleteValue(resVal);
resVal->data.b = tmp;
resVal->type = VT_Bool;
break;
}
case VT_Bool:
resVal->data.b = aVal->data.b == bVal->data.b;
resVal->type = VT_Bool;
break;
case VT_Null:
resVal->data.b = 1;
resVal->type = VT_Bool;
break;
default:
resVal->type = VT_Bool;
resVal->data.b = 0;
break;
}
}
else {
resVal->type = VT_Bool;
resVal->data.b = 0;
}
break;
case IST_NotEqual:
if (stackPtr + instructionPtr->res >= vectorSize(stack))
vectorPushDefaultValue(stack);
if (!fillValuePtrs(vectorFastAtValue(stack, stackPtr), cCtIt, &resVal, &aVal, &bVal,
instructionPtr))
break;
if (aVal->type == bVal->type) {
switch (aVal->type) {
case VT_Integer:
resVal->data.b = aVal->data.i != bVal->data.i;
resVal->type = VT_Bool;
break;
case VT_Double:
resVal->data.b = aVal->data.d != bVal->data.d;
resVal->type = VT_Bool;
break;
case VT_String: {
uint8_t tmp = stringCompare(&aVal->data.s, &bVal->data.s) != 0;
deleteValue(resVal);
resVal->data.b = tmp;
resVal->type = VT_Bool;
break;
}
case VT_Bool:
resVal->data.b = aVal->data.b != bVal->data.b;
resVal->type = VT_Bool;
break;
default:
resVal->type = VT_Bool;
resVal->data.b = 0;
break;
}
}
else {
resVal->type = VT_Bool;
resVal->data.b = 1;
}
break;
case IST_Less:
if (stackPtr + instructionPtr->res >= vectorSize(stack))
vectorPushDefaultValue(stack);
if (!fillValuePtrs(vectorFastAtValue(stack, stackPtr), cCtIt, &resVal, &aVal, &bVal,
instructionPtr))
break;
if (aVal->type == bVal->type ) {
switch (aVal->type) {
case VT_Integer:
resVal->data.b = aVal->data.i < bVal->data.i;
resVal->type = VT_Bool;
break;
case VT_Double:
resVal->data.b = aVal->data.d < bVal->data.d;
resVal->type = VT_Bool;
break;
case VT_String: {
uint8_t tmp = stringCompare(&aVal->data.s, &bVal->data.s) < 0;
deleteValue(resVal);
resVal->data.b = tmp;
resVal->type = VT_Bool;
break;
}
case VT_Bool:
resVal->data.b = aVal->data.b < bVal->data.b;
resVal->type = VT_Bool;
break;
default:
resVal->type = VT_Bool;
resVal->data.b = 0;
break;
}
}
else
setError(ERR_OperandTypes);
break;
case IST_LessEq:
if (stackPtr + instructionPtr->res >= vectorSize(stack))
vectorPushDefaultValue(stack);
if (!fillValuePtrs(vectorFastAtValue(stack, stackPtr), cCtIt, &resVal, &aVal, &bVal,
instructionPtr))
break;
if (aVal->type == bVal->type ) {
switch (aVal->type) {
case VT_Integer:
resVal->data.b = aVal->data.i <= bVal->data.i;
resVal->type = VT_Bool;
break;
case VT_Double:
resVal->data.b = aVal->data.d <= bVal->data.d;
resVal->type = VT_Bool;
break;
case VT_String: {
uint8_t tmp = stringCompare(&aVal->data.s, &bVal->data.s) <= 0;
deleteValue(resVal);
resVal->data.b = tmp;
resVal->type = VT_Bool;
break;
}
case VT_Bool:
resVal->data.b = aVal->data.b <= bVal->data.b;
resVal->type = VT_Bool;
break;
default:
resVal->type = VT_Bool;
resVal->data.b = 0;
break;
}
}
else
setError(ERR_OperandTypes);
break;
case IST_Greater:
if (stackPtr + instructionPtr->res >= vectorSize(stack))
vectorPushDefaultValue(stack);
if (!fillValuePtrs(vectorFastAtValue(stack, stackPtr), cCtIt, &resVal, &aVal, &bVal,
instructionPtr))
break;
if (aVal->type == bVal->type ) {
switch (aVal->type) {
case VT_Integer:
resVal->data.b = aVal->data.i > bVal->data.i;
resVal->type = VT_Bool;
break;
case VT_Double:
resVal->data.b = aVal->data.d > bVal->data.d;
resVal->type = VT_Bool;
break;
case VT_String: {
uint8_t tmp = stringCompare(&aVal->data.s, &bVal->data.s) > 0;
deleteValue(resVal);
resVal->data.b = tmp;
resVal->type = VT_Bool;
break;
}
case VT_Bool:
resVal->data.b = aVal->data.b > bVal->data.b;
resVal->type = VT_Bool;
break;
default:
resVal->type = VT_Bool;
resVal->data.b = 0;
break;
}
}
else
setError(ERR_OperandTypes);
break;
case IST_GreaterEq:
if (stackPtr + instructionPtr->res >= vectorSize(stack))
vectorPushDefaultValue(stack);
if (!fillValuePtrs(vectorFastAtValue(stack, stackPtr), cCtIt, &resVal, &aVal, &bVal,
instructionPtr))
break;
if (aVal->type == bVal->type ) {
switch (aVal->type) {
case VT_Integer:
resVal->data.b = aVal->data.i >= bVal->data.i;
resVal->type = VT_Bool;
break;
case VT_Double:
resVal->data.b = aVal->data.d >= bVal->data.d;
resVal->type = VT_Bool;
break;
case VT_String: {
uint8_t tmp = stringCompare(&aVal->data.s, &bVal->data.s) >= 0;
deleteValue(resVal);
resVal->data.b = tmp;
resVal->type = VT_Bool;
break;
}
case VT_Bool:
resVal->data.b = aVal->data.b >= bVal->data.b;
resVal->type = VT_Bool;
break;
default:
resVal->type = VT_Bool;
resVal->data.b = 0;
break;
}
}
else
setError(ERR_OperandTypes);
break;
case IST_And: {
if (stackPtr + instructionPtr->res >= vectorSize(stack))
vectorPushDefaultValue(stack);
if (!fillValuePtrs(vectorFastAtValue(stack, stackPtr), cCtIt, &resVal, &aVal, &bVal,
instructionPtr))
break;
uint8_t tmp = valueToBool(aVal) && valueToBool(bVal);
deleteValue(resVal);
resVal->data.b = tmp;
resVal->type = VT_Bool;
break;
}
case IST_Or: {
if (stackPtr + instructionPtr->res >= vectorSize(stack))
vectorPushDefaultValue(stack);
if (!fillValuePtrs(vectorFastAtValue(stack, stackPtr), cCtIt, &resVal, &aVal, &bVal,
instructionPtr))
break;
uint8_t tmp = valueToBool(aVal) || valueToBool(bVal);
deleteValue(resVal);
resVal->data.b = tmp;
resVal->type = VT_Bool;
break;
}
case IST_Not: {
if (stackPtr + instructionPtr->res >= vectorSize(stack))
vectorPushDefaultValue(stack);
if (!fillResConstValuePtr(vectorFastAtValue(stack, stackPtr), cCtIt, &resVal, &aVal,
instructionPtr->res, instructionPtr->a))
break;
// if B is 1 it means we are actually performing negation (used in case of odd number of negations)
// if B is 0 it means we just convert value to bool (used in case of even number of negations)
// A is TRUE(1) and B is TRUE(1) = 1 ^ 1 = FALSE(0)
// A is FALSE(0) and B is TRUE(1) = 0 ^ 1 = TRUE(1)
// A is TRUE(1) and B is FALSE(0) = 1 ^ 0 = TRUE(1)
// A is FALSE(0) and B is FALSE(0) = 0 ^ 0 = FALSE(0)
uint8_t tmp = valueToBool(aVal) ^ instructionPtr->b;
deleteValue(resVal);
resVal->data.b = tmp;
resVal->type = VT_Bool;
break;
}
default:
break;
}
if(getError())
return;
// Move to next instruction
instructionPtr++;
}
}
void interpret(const Instruction *firstInstruction, const Vector *constTable, const Vector *addressTable)
{
Vector *stack = newValueVector();
vectorReserve(stack, DEFAULT_STACK_CAPACITY);
// Reserve space for global return value
vectorPushDefaultValue(stack);
interpretationLoop(firstInstruction, constTable, addressTable, stack);
freeValueVector(&stack);
// Force printing to output
fflush(stdout);
}