dvander@39: /* vim: set ts=4 sw=4 tw=99 et:
dvander@39:  *
dvander@0:  * Copyright (C) 2012 David Anderson
dvander@0:  *
dvander@0:  * This file is part of JITCraft.
dvander@0:  *
dvander@0:  * JITCraft is free software: you can redistribute it and/or modify it under
dvander@0:  * the terms of the GNU General Public License as published by the Free
dvander@0:  * Software Foundation, either version 3 of the License, or (at your option)
dvander@0:  * any later version.
dvander@0:  * 
dvander@0:  * Foobar is distributed in the hope that it will be useful, but WITHOUT ANY
dvander@0:  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
dvander@0:  * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
dvander@0:  *
dvander@0:  * You should have received a copy of the GNU General Public License along with
dvander@0:  * JITCraft. If not, see http://www.gnu.org/licenses/.
dvander@0:  */
dvander@0: #include "Interpreter.h"
dvander@0: #include "Modules.h"
dvander@0: #include "Zone.h"
dvander@0: #include "Types.h"
dvander@12: #include "Array.h"
dvander@14: #include "Reference.h"
dvander@28: #include "Heap-inl.h"
dvander@0: 
dvander@59: using namespace ke;
dvander@0: 
dvander@0: #define PUSH_I32(top, value)    \
dvander@0:     do {                        \
dvander@0:         top.sp->i32 = value;    \
dvander@0:         top.sp++;               \
dvander@0:    } while (0)
dvander@0: 
dvander@4: #define PUSH_F(top, value)      \
dvander@4:     do {                        \
dvander@4:         top.sp->f = value;      \
dvander@4:         top.sp++;               \
dvander@4:    } while (0)
dvander@4: 
dvander@0: static inline int
dvander@0: POP_I32(Top &top)
dvander@0: {
dvander@0:     int value = top.sp[-1].i32;
dvander@0:     top.sp--;
dvander@0:     return value;
dvander@0: }
dvander@0: 
dvander@4: static inline float
dvander@4: POP_F(Top &top)
dvander@4: {
dvander@4:     float value = top.sp[-1].f;
dvander@4:     top.sp--;
dvander@4:     return value;
dvander@4: }
dvander@4: 
dvander@0: static inline bool
dvander@14: PushNewRef(Zone *zone, Top &top, void *location, Heap::Tenure tenure)
dvander@14: {
dvander@14:     Reference *ref = Reference::NewStack(zone, location, tenure);
dvander@14:     if (!ref)
dvander@14:         return false;
dvander@14:     top.sp->ref = ref;
dvander@14:     top.sp++;
dvander@14:     return true;
dvander@14: }
dvander@14: 
dvander@14: static inline bool
dvander@0: CheckDimensionSize(int size, unsigned width)
dvander@0: {
dvander@0:     if (size <= 0) {
dvander@0:         assert(false);
dvander@0:         return false;
dvander@0:     }
dvander@0:     // One  word, because we hide stuff below and need to add that in.
dvander@0:     if (unsigned(size) >= (INT_MAX / width) - sizeof(unsigned)) {
dvander@0:         assert(false);
dvander@0:         return false;
dvander@0:     }
dvander@0:     return true;
dvander@0: }
dvander@0: 
dvander@12: // Generate an array with completely static sizes.
dvander@12: static Array *
dvander@27: GenerateArray(Zone *zone, Handle<ArrayMap> map)
dvander@0: {
dvander@12:     assert(map->type()->elements() != -1);
dvander@0: 
dvander@43:     Local<Array> array(zone, Array::New(zone, map, map->type()->elements(), Heap::Tenure_Stack));
dvander@12:     if (!array)
dvander@0:         return NULL;
dvander@0: 
dvander@12:     if (map->type()->levels() == 1)
dvander@12:         return array;
dvander@0: 
dvander@27:     Local<ArrayMap> contained(zone, map->contained());
dvander@43:     Local<Array> sub(zone);
dvander@12:     for (unsigned i = 0; i < unsigned(map->type()->elements()); i++) {
dvander@43:         sub = GenerateArray(zone, contained);
dvander@12:         if (!sub)
dvander@0:             return NULL;
dvander@12:         array->writeObject(zone, i, sub);
dvander@0:     }
dvander@0: 
dvander@12:     return array;
dvander@0: }
dvander@0: 
dvander@21: static bool
dvander@21: CopyArray(Zone *zone, Array *source, Array *dest)
dvander@21: {
dvander@21:     assert(source->type()->levels() == 1);
dvander@21:     assert(dest->type()->levels() == 1);
dvander@21:     assert(source->type()->contained()->primitive() ==
dvander@21:            dest->type()->contained()->primitive());
dvander@21:     assert(source->nelements() >= dest->nelements());
dvander@21:     assert(dest->elementSize() == source->elementSize());
dvander@21: 
dvander@21:     memcpy(source->vec(), dest->vec(), dest->nelements() * dest->elementSize());
dvander@21:     return true;
dvander@21: }
dvander@21: 
dvander@68: static bool
dvander@68: InvokeNative(Zone *zone, Handle<Native> native, void *identity, LocalSlot *args, unsigned argc,
dvander@68:              int *result)
dvander@68: {
dvander@68:     NativeArgs guard;
dvander@68: 
dvander@68:     if (!zone->stack().pushNativeFrame(native, guard, argc + 1))
dvander@68:         return false;
dvander@68: 
dvander@68:     intptr_t *cells = guard.args();
dvander@68: 
dvander@68:     // params[0] == argc, in ISPE
dvander@68:     cells[0] = argc;
dvander@68: 
dvander@68:     // Pass the formal arguments.
dvander@68:     Local<Type> type(zone, native->type());
dvander@68:     Local<Type> param(zone);
dvander@68:     for (unsigned i = 0; i < type->parameters()->length(); i++) {
dvander@68:         param = type->parameterAt(i);
dvander@68:         
dvander@68:         // For floats, we rely on the aliasing of |i32| and |f|.
dvander@68:         LocalSlot &arg = args[-int(i) - 1];
dvander@68:         if (param->isInt32() || param->isFloat()) {
dvander@68:             cells[i + 1] = arg.i32;
dvander@68:         } else if (param->isReference()) {
dvander@68:             cells[i + 1] = reinterpret_cast<intptr_t>(arg.ref->location());
dvander@68:         } else {
dvander@68:             assert(param->isArray());
dvander@68:             cells[i + 1] = reinterpret_cast<intptr_t>(arg.array->vec());
dvander@68:         }
dvander@68:     }
dvander@68: 
dvander@68:     // For variadic arguments, the compiler left either arrays or references.
dvander@68:     for (unsigned i = type->parameters()->length(); i < argc; i++) {
dvander@68:         LocalSlot &arg = args[-int(i) - 1];
dvander@68: 
dvander@68:         if (arg.obj->is(MapKind_Reference)) {
dvander@68:             cells[i + 1] = reinterpret_cast<intptr_t>(arg.ref->location());
dvander@68:         } else {
dvander@68:             assert(arg.obj->is(MapKind_Array));
dvander@68:             cells[i + 1] = reinterpret_cast<intptr_t>(arg.array->vec());
dvander@68:         }
dvander@68:     }
dvander@68: 
dvander@68:     typedef intptr_t (*INVOKE)(void *, intptr_t *);
dvander@68:     INVOKE invoke = (INVOKE)native->function();
dvander@68:     *result = invoke(identity, cells);
dvander@68: 
dvander@68:     // :TODO: detect errors.
dvander@68:     return true;
dvander@68: }
dvander@68: 
dvander@0: bool
dvander@59: ke::Interpret(Zone *zone, Frame *entryFrame, LocalSlot *result)
dvander@0: {
dvander@42:     Top &top = *zone->stack().top();
dvander@47:     LocalSlot *locals = entryFrame->locals();
dvander@0: 
dvander@0:     for (;;) {
dvander@0:         Opcode op = Opcode(*top.pc);
dvander@0:         switch (op) {
dvander@0: 
dvander@0: case OP_NOP:
dvander@0:     break;
dvander@0: 
dvander@0: case OP_INT:
dvander@0:     PUSH_I32(top, READ_INT32(top.pc));
dvander@0:     break;
dvander@0: 
dvander@4: case OP_FLOAT:
dvander@4:     PUSH_F(top, READ_FLOAT(top.pc));
dvander@4:     break;
dvander@4: 
dvander@0: case OP_RETURN:
dvander@0: {
dvander@4:     *result = *--top.sp;
dvander@47:     if (!top.fp->prev())
dvander@0:         return true;
dvander@0: 
dvander@65:     zone->stack().popInlineFrame();
dvander@47:     locals = top.fp->locals();
dvander@4:     *top.sp++ = *result;
dvander@0:     top.pc += OpcodeInfo[*top.pc].length;
dvander@0:     continue;
dvander@0: }
dvander@0: 
dvander@0: #define RELATIONAL_JUMP(op)                 \
dvander@0:     {                                       \
dvander@0:         int right = POP_I32(top);           \
dvander@0:         int left = POP_I32(top);            \
dvander@0:         if (left op right) {                \
dvander@0:             top.pc += READ_INT32(top.pc);   \
dvander@0:             continue;                       \
dvander@0:         }                                   \
dvander@0:     }
dvander@0: 
dvander@0: case OP_JL:
dvander@0:     RELATIONAL_JUMP(<);
dvander@0:     break;
dvander@0: 
dvander@0: case OP_JLE:
dvander@0:     RELATIONAL_JUMP(<=);
dvander@0:     break;
dvander@0: 
dvander@0: case OP_JG:
dvander@0:     RELATIONAL_JUMP(>);
dvander@0:     break;
dvander@0: 
dvander@0: case OP_JGE:
dvander@0:     RELATIONAL_JUMP(>=);
dvander@0:     break;
dvander@0: 
dvander@0: case OP_JEQ:
dvander@0:     RELATIONAL_JUMP(==);
dvander@0:     break;
dvander@0: 
dvander@0: case OP_JNE:
dvander@0:     RELATIONAL_JUMP(!=);
dvander@0:     break;
dvander@0: 
dvander@0: case OP_JT:
dvander@0: {
dvander@0:     int value = POP_I32(top);
dvander@0:     if (value) {
dvander@0:         top.pc += READ_INT32(top.pc);
dvander@0:         continue;
dvander@0:     }
dvander@0:     break;
dvander@0: }
dvander@0: 
dvander@0: case OP_JF:
dvander@0: {
dvander@0:     int value = POP_I32(top);
dvander@0:     if (!value) {
dvander@0:         top.pc += READ_INT32(top.pc);
dvander@0:         continue;
dvander@0:     }
dvander@0:     break;
dvander@0: }
dvander@0: 
dvander@0: case OP_JUMP:
dvander@0:     top.pc += READ_INT32(top.pc);
dvander@0:     continue;
dvander@0: 
dvander@0: case OP_GETLOCAL:
dvander@0: {
dvander@0:     int slot = READ_INT32(top.pc);
dvander@0:     *top.sp++ = locals[slot];
dvander@0:     break;
dvander@0: }
dvander@0: 
dvander@0: case OP_SETLOCAL:
dvander@0: {
dvander@0:     int slot = READ_INT32(top.pc);
dvander@0:     locals[slot] = top.sp[-1];
dvander@0:     break;
dvander@0: }
dvander@0: 
dvander@0: case OP_ADD:
dvander@0: {
dvander@0:     int right = POP_I32(top);
dvander@0:     int left = POP_I32(top);
dvander@0:     int result = left + right;
dvander@0:     PUSH_I32(top, result);
dvander@0:     break;
dvander@0: }
dvander@0: 
dvander@0: case OP_SUB:
dvander@0: {
dvander@0:     int right = POP_I32(top);
dvander@0:     int left = POP_I32(top);
dvander@0:     int result = left - right;
dvander@0:     PUSH_I32(top, result);
dvander@0:     break;
dvander@0: }
dvander@0: 
dvander@0: case OP_MUL:
dvander@0: {
dvander@0:     int right = POP_I32(top);
dvander@0:     int left = POP_I32(top);
dvander@0:     int result = left * right;
dvander@22:     PUSH_I32(top, result);
dvander@0:     break;
dvander@0: }
dvander@0: 
dvander@0: case OP_DIV:
dvander@0: {
dvander@0:     int right = POP_I32(top);
dvander@0:     int left = POP_I32(top);
dvander@0:     if (!right)
dvander@0:         return false;
dvander@0:     int result = left / right;
dvander@0:     PUSH_I32(top, result);
dvander@0:     break;
dvander@0: }
dvander@0: 
dvander@4: case OP_ADD_F:
dvander@4: {
dvander@4:     float right = POP_F(top);
dvander@4:     float left = POP_F(top);
dvander@4:     float result = left + right;
dvander@4:     PUSH_F(top, result);
dvander@4:     break;
dvander@4: }
dvander@4: 
dvander@4: case OP_SUB_F:
dvander@4: {
dvander@4:     float right = POP_F(top);
dvander@4:     float left = POP_F(top);
dvander@4:     float result = left - right;
dvander@4:     PUSH_F(top, result);
dvander@4:     break;
dvander@4: }
dvander@4: 
dvander@4: case OP_MUL_F:
dvander@4: {
dvander@4:     float right = POP_F(top);
dvander@4:     float left = POP_F(top);
dvander@4:     float result = left * right;
dvander@4:     PUSH_F(top, result);
dvander@4:     break;
dvander@4: }
dvander@4: 
dvander@4: case OP_DIV_F:
dvander@4: {
dvander@4:     float right = POP_F(top);
dvander@4:     float left = POP_F(top);
dvander@4:     if (!right)
dvander@4:         return false;
dvander@4:     float result = left / right;
dvander@4:     PUSH_F(top, result);
dvander@4:     break;
dvander@4: }
dvander@4: 
dvander@8: case OP_SHL:
dvander@8: {
dvander@8:     int right = POP_I32(top);
dvander@8:     int left = POP_I32(top);
dvander@8:     int result = left << right;
dvander@8:     PUSH_I32(top, result);
dvander@8:     break;
dvander@8: }
dvander@8: 
dvander@8: case OP_SHR:
dvander@8: {
dvander@8:     int right = POP_I32(top);
dvander@8:     int left = POP_I32(top);
dvander@8:     int result = left >> right;
dvander@8:     PUSH_I32(top, result);
dvander@8:     break;
dvander@8: }
dvander@8: 
dvander@8: case OP_USHR:
dvander@8: {
dvander@8:     int right = POP_I32(top);
dvander@8:     int left = POP_I32(top);
dvander@8:     int result = unsigned(left) >> unsigned(right);
dvander@8:     PUSH_I32(top, result);
dvander@8:     break;
dvander@8: }
dvander@8: 
dvander@8: case OP_BITAND:
dvander@8: {
dvander@8:     int right = POP_I32(top);
dvander@8:     int left = POP_I32(top);
dvander@8:     int result = left & right;
dvander@8:     PUSH_I32(top, result);
dvander@8:     break;
dvander@8: }
dvander@8: 
dvander@8: case OP_BITOR:
dvander@8: {
dvander@8:     int right = POP_I32(top);
dvander@8:     int left = POP_I32(top);
dvander@8:     int result = left | right;
dvander@8:     PUSH_I32(top, result);
dvander@8:     break;
dvander@8: }
dvander@8: 
dvander@8: case OP_BITXOR:
dvander@8: {
dvander@8:     int right = POP_I32(top);
dvander@8:     int left = POP_I32(top);
dvander@8:     int result = left ^ right;
dvander@8:     PUSH_I32(top, result);
dvander@8:     break;
dvander@8: }
dvander@8: 
dvander@0: case OP_POP:
dvander@0:     top.sp--;
dvander@0:     break;
dvander@0: 
dvander@0: case OP_STOP:
dvander@0:     assert(false);
dvander@0:     break;
dvander@0: 
dvander@0: case OP_CALLGLOBAL:
dvander@0: {
dvander@53:     zone->heap().reclaim();
dvander@46:     unsigned index = READ_UINT32(top.pc);
dvander@47:     Local<Function> newFun(zone, top.fp->code()->module()->getFunction(index));
dvander@65:     if (!zone->stack().pushInlineFrame(newFun)) {
dvander@47:         assert(false);
dvander@47:         return false;
dvander@47:     }
dvander@0: 
dvander@47:     locals = top.fp->locals();
dvander@0:     continue;
dvander@0: }
dvander@0: 
dvander@0: case OP_GETARG:
dvander@0: {
dvander@0:     unsigned slot = READ_UINT32(top.pc);
dvander@47:     *top.sp++ = top.fp->arg(slot);
dvander@0:     break;
dvander@0: }
dvander@0: 
dvander@0: case OP_SETARG:
dvander@0: {
dvander@0:     unsigned slot = READ_UINT32(top.pc);
dvander@47:     top.fp->arg(slot) = *--top.sp;
dvander@0:     break;
dvander@0: }
dvander@0: 
dvander@19: case OP_BOUNDS:
dvander@0: {
dvander@12:     Array *array = top.sp[-2].array;
dvander@0:     int index = top.sp[-1].i32;
dvander@12:     if (index < 0 || unsigned(index) >= array->nelements())
dvander@0:         return false;
dvander@0:     break;
dvander@0: }
dvander@0: 
dvander@6: case OP_GETARRAY_I:
dvander@0: {
dvander@12:     Array *array = top.sp[-2].array;
dvander@0:     int index = top.sp[-1].i32;
dvander@0:     top.sp[-2].i32 = array->readInt32(index);
dvander@0:     top.sp--;
dvander@0:     break;
dvander@0: }
dvander@0: 
dvander@7: case OP_GETARRAY_F:
dvander@7: {
dvander@12:     Array *array = top.sp[-2].array;
dvander@7:     int index = top.sp[-1].i32;
dvander@7:     top.sp[-2].f = array->readFloat(index);
dvander@7:     top.sp--;
dvander@7:     break;
dvander@7: }
dvander@7: 
dvander@21: case OP_GETARRAY_C:
dvander@21: {
dvander@21:     Array *array = top.sp[-2].array;
dvander@21:     int index = top.sp[-1].i32;
dvander@21:     top.sp[-2].i32 = array->readChar(index);
dvander@21:     top.sp--;
dvander@21:     break;
dvander@21: }
dvander@21: 
dvander@6: case OP_SETARRAY_I:
dvander@0: {
dvander@12:     Array *array = top.sp[-3].array;
dvander@0:     int index = top.sp[-2].i32;
dvander@0:     array->writeInt32(index, top.sp[-1].i32);
dvander@0:     top.sp[-3] = top.sp[-1];
dvander@0:     top.sp -= 2;
dvander@0:     break;
dvander@0: }
dvander@0: 
dvander@7: case OP_SETARRAY_F:
dvander@7: {
dvander@12:     Array *array = top.sp[-3].array;
dvander@7:     int index = top.sp[-2].i32;
dvander@7:     array->writeFloat(index, top.sp[-1].f);
dvander@7:     top.sp[-3] = top.sp[-1];
dvander@7:     top.sp -= 2;
dvander@7:     break;
dvander@7: }
dvander@7: 
dvander@21: case OP_SETARRAY_C:
dvander@21: {
dvander@21:     Array *array = top.sp[-3].array;
dvander@21:     int index = top.sp[-2].i32;
dvander@21:     array->writeChar(index, top.sp[-1].i32);
dvander@21:     top.sp[-3] = top.sp[-1];
dvander@21:     top.sp -= 2;
dvander@21:     break;
dvander@21: }
dvander@21: 
dvander@19: case OP_GETARRAY_O:
dvander@0: {
dvander@12:     Array *array = top.sp[-2].array;
dvander@0:     int index = top.sp[-1].i32;
dvander@12:     top.sp[-2].array = Array::cast(array->readObject(index));
dvander@0:     top.sp--;
dvander@0:     break;
dvander@0: }
dvander@0: 
dvander@4: case OP_CVT_I2F:
dvander@4: {
dvander@4:     int ival = POP_I32(top);
dvander@4:     float fval = (float)ival;
dvander@4:     PUSH_F(top, fval);
dvander@4:     break;
dvander@4: }
dvander@4: 
dvander@19: case OP_NEWARRAY_LIFO:
dvander@12: {
dvander@47:     Local<ArrayMap> map(zone, ArrayMap::cast(top.fp->code()->map(READ_UINT32(top.pc))));
dvander@42:     Array *array = GenerateArray(zone, map);
dvander@12:     if (!array) {
dvander@12:         assert(false);
dvander@12:         return false;
dvander@12:     }
dvander@12:     top.sp->obj = array;
dvander@12:     top.sp++;
dvander@12:     break;
dvander@12: }
dvander@12: 
dvander@12: case OP_SAVELIFO:
dvander@10: {
dvander@10:     unsigned slot = READ_UINT32(top.pc);
dvander@42:     locals[slot].address = zone->heap().lifoPosition();
dvander@12:     break;
dvander@12: }
dvander@12: 
dvander@12: case OP_UNWINDLIFO:
dvander@12: {
dvander@12:     unsigned slot = READ_UINT32(top.pc);
dvander@42:     zone->heap().unwindLifo(locals[slot].address);
dvander@10:     break;
dvander@10: }
dvander@10: 
dvander@14: case OP_VARREF_LIFO:
dvander@14: {
dvander@14:     unsigned slot = READ_UINT32(top.pc);
dvander@42:     if (!PushNewRef(zone, top, &locals[slot], Heap::Tenure_Stack)) {
dvander@14:         assert(false);
dvander@14:         return false;
dvander@14:     }
dvander@14:     break;
dvander@14: }
dvander@14: 
dvander@14: case OP_ARGREF_LIFO:
dvander@14: {
dvander@14:     unsigned slot = READ_UINT32(top.pc);
dvander@47:     if (!PushNewRef(zone, top, &top.fp->arg(slot), Heap::Tenure_Stack)) {
dvander@14:         assert(false);
dvander@14:         return false;
dvander@14:     }
dvander@14:     break;
dvander@14: }
dvander@14: 
dvander@17: case OP_ARRAYREF_LIFO:
dvander@17: {
dvander@42:     Local<Array> array(zone, top.sp[-2].array);
dvander@42:     Local<Reference> ref(zone, Reference::NewArray(zone, array, top.sp[-1].i32, Heap::Tenure_Stack));
dvander@17:     if (!ref) {
dvander@17:         assert(false);
dvander@17:         return false;
dvander@17:     }
dvander@17:     top.sp[-2].ref = ref;
dvander@17:     top.sp--;
dvander@17:     break;
dvander@17: }
dvander@17: 
dvander@16: case OP_SLOTREF_LIFO:
dvander@16: {
dvander@42:     Reference *ref = Reference::NewStack(zone, top.sp[-1], Heap::Tenure_Stack);
dvander@16:     if (!ref) {
dvander@16:         assert(false);
dvander@16:         return false;
dvander@16:     }
dvander@16:     top.sp[-1].ref = ref;
dvander@16:     break;
dvander@16: }
dvander@16: 
dvander@14: case OP_GETREF_I:
dvander@14: {
dvander@14:     top.sp[-1].i32 = top.sp[-1].ref->getInt();
dvander@14:     break;
dvander@14: }
dvander@14: 
dvander@14: case OP_SETREF_I:
dvander@14: {
dvander@14:     top.sp[-2].ref->setInt(top.sp[-1].i32);
dvander@14:     top.sp[-2].i32 = top.sp[-1].i32;
dvander@23:     top.sp--;
dvander@14:     break;
dvander@14: }
dvander@14: 
dvander@14: case OP_GETREF_F:
dvander@14: {
dvander@14:     top.sp[-1].f = top.sp[-1].ref->getFloat();
dvander@14:     break;
dvander@14: }
dvander@14: 
dvander@14: case OP_SETREF_F:
dvander@14: {
dvander@14:     top.sp[-2].ref->setFloat(top.sp[-1].f);
dvander@14:     top.sp[-2].f = top.sp[-1].f;
dvander@14:     break;
dvander@14: }
dvander@14: 
dvander@21: case OP_OBJECT:
dvander@21: {
dvander@47:     top.sp->obj = top.fp->code()->object(READ_UINT32(top.pc));
dvander@21:     top.sp++;
dvander@21:     break;
dvander@21: }
dvander@21: 
dvander@21: case OP_ARRAYCOPY:
dvander@21: {
dvander@21:     // Note for this assignment opcode, we return the left-hand side, not the
dvander@21:     // right, since in this case the result of the expression could be different.
dvander@42:     if (!CopyArray(zone, top.sp[-2].array, top.sp[-1].array)) {
dvander@21:         assert(false);
dvander@21:         return false;
dvander@21:     }
dvander@21:     top.sp--;
dvander@21:     break;
dvander@21: }
dvander@21: 
dvander@22: case OP_DUP:
dvander@22: {
dvander@23:     top.sp++;
dvander@23:     top.sp[-1] = top.sp[-2];
dvander@22:     break;
dvander@22: }
dvander@22: 
dvander@22: case OP_DUP2:
dvander@22: {
dvander@23:     top.sp += 2;
dvander@23:     top.sp[-2] = top.sp[-4];
dvander@23:     top.sp[-1] = top.sp[-3];
dvander@23:     break;
dvander@23: }
dvander@23: 
dvander@23: case OP_SWAP:
dvander@23: {
dvander@23:     LocalSlot slot = top.sp[-2];
dvander@23:     top.sp[-2] = top.sp[-1];
dvander@23:     top.sp[-1] = slot;
dvander@23:     break;
dvander@23: }
dvander@23: 
dvander@23: case OP_ROLL3:
dvander@23: {
dvander@23:     LocalSlot slot = top.sp[-3];
dvander@23:     top.sp[-3] = top.sp[-2];
dvander@23:     top.sp[-2] = top.sp[-1];
dvander@23:     top.sp[-1] = slot;
dvander@23:     break;
dvander@23: }
dvander@23: 
dvander@23: case OP_PICK2:
dvander@23: {
dvander@23:     top.sp++;
dvander@23:     top.sp[-1] = top.sp[-3];
dvander@23:     break;
dvander@23: }
dvander@23: 
dvander@23: case OP_PICK3:
dvander@23: {
dvander@23:     top.sp++;
dvander@23:     top.sp[-1] = top.sp[-4];
dvander@22:     break;
dvander@22: }
dvander@22: 
dvander@68: case OP_CALLNATIVE:
dvander@68: {
dvander@68:     unsigned index = READ_UINT32(top.pc);
dvander@68:     unsigned argc = READ_UINT32(top.pc + 4);
dvander@68: 
dvander@68:     Local<Native> native(zone, Native::cast(top.fp->code()->module()->natives()->at(index)));
dvander@68:     if (!native->function()) {
dvander@68:         // :TODO: error
dvander@68:         assert(false);
dvander@68:         return false;
dvander@68:     }
dvander@68: 
dvander@68:     int result;
dvander@68:     void *nativeIdentity = top.fp->code()->module()->nativeIdentity();
dvander@68:     if (!InvokeNative(zone, native, nativeIdentity, top.sp, argc, &result)) {
dvander@68:         assert(false);
dvander@68:         return false;
dvander@68:     }
dvander@68: 
dvander@68:     top.sp -= argc;
dvander@68:     PUSH_I32(top, result);
dvander@68:     break;
dvander@68: }
dvander@68: 
dvander@0: default:
dvander@0:     assert(false);
dvander@0:     return false;
dvander@0: 
dvander@0:         }
dvander@0: 
dvander@0:         top.pc += OpcodeInfo[op].length;
dvander@0:     }
dvander@0: 
dvander@0:     return true;
dvander@0: }