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vm.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include "compiler.h"
#include "disasm.h"
#include "memory.h"
#include "native.h"
#include "vm.h"
VM vm;
static void resetStack(void) {
vm.sp = vm.stack;
vm.frameCount = 0;
vm.openUpvalues = NULL;
}
static void closeUpvalues(Value* last);
#ifdef LOX_DBG
static void indentCallTrace(void) {
int depth = vm.frameCount;
while (depth--)
putstr(" ");
}
static void printArgList(int argCount) {
const char* separator = "";
Value* args = vm.sp - argCount;
while (argCount--) {
putstr(separator);
separator = ", ";
printValue(*args++, PRTF_MACHINE | PRTF_EXPAND);
}
}
static void printStack(void) {
Value* slot;
for (slot = vm.stack; slot < vm.sp; slot++) {
printValue(*slot, PRTF_MACHINE | PRTF_COMPACT);
putstr(" | ");
}
putstr("\n");
}
#endif
static void printBacktrace(void) {
int i;
size_t instruction;
CallFrame* frame;
ObjFunction* function;
for (i = vm.frameCount - 1; i >= 0; i--) {
frame = &vm.frames[i];
function = frame->closure->function;
instruction = frame->ip - function->chunk.code - 1;
printf("[line %d] in %s\n", getLine(&function->chunk, instruction), functionName(function));
}
resetStack();
}
void runtimeError(const char* format, ...) {
va_list args;
int i;
CallFrame* frame;
va_start(args, format);
vsprintf(big_buffer, format, args);
va_end(args);
#ifdef LOX_DBG
if (vm.log_native_result) {
printf("/!\\ \"%s\"\n", big_buffer);
vm.log_native_result = false;
}
if (vm.debug_trace_calls) {
indentCallTrace();
printf("<== \"%s\"\n", big_buffer);
}
#endif
// search for handler in frames
for (i = vm.frameCount - 1; i >= 0; i--) {
frame = &vm.frames[i];
if (!IS_NIL(frame->handler)) {
if (IS_STRING(frame->handler)) {
popGlobal(frame->handler);
continue;
}
closeUpvalues(frame->fp);
vm.sp = frame->fp;
vm.frameCount = i;
pushUnchecked(frame->handler);
pushUnchecked(OBJ_VAL(makeString0(big_buffer)));
vm.handleException = true;
return;
}
}
putstr("Runtime error: ");
putstr(big_buffer);
putstr("\n");
printBacktrace();
}
void userError(Value exception) {
int i;
CallFrame* frame;
#ifdef LOX_DBG
if (vm.log_native_result) {
putstr("/!\\ ");
printValue(exception, PRTF_MACHINE | PRTF_EXPAND);
putstr("\n");
vm.log_native_result = false;
}
if (vm.debug_trace_calls) {
indentCallTrace();
putstr("<== ");
printValue(exception, PRTF_MACHINE | PRTF_EXPAND);
putstr("\n");
}
#endif
// search for handler in frames
for (i = vm.frameCount - 1; i >= 0; i--) {
frame = &vm.frames[i];
if (!IS_NIL(frame->handler)) {
if (IS_STRING(frame->handler)) {
popGlobal(frame->handler);
continue;
}
closeUpvalues(frame->fp);
vm.sp = frame->fp;
vm.frameCount = i;
pushUnchecked(frame->handler);
pushUnchecked(exception);
vm.handleException = true;
return;
}
}
putstr("Runtime error: ");
printValue(exception, PRTF_HUMAN | PRTF_EXPAND);
putstr("\n");
printBacktrace();
}
void initVM(void) {
resetStack();
vm.objects = NULL;
vm.bytesAllocated = 0;
vm.grayCount = 0;
vm.lambdaCount = 0;
vm.randomState = 47110815;
initTable(&vm.globals);
initTable(&vm.strings);
vm.initString = NULL;
vm.initString = makeString0("init");
defineAllNatives();
}
#ifndef KIT68K
void freeVM(void) {
freeTable(&vm.globals);
freeTable(&vm.strings);
vm.initString = NULL;
freeObjects();
}
#endif
#ifndef KIT68K
// Optimized ASM code for 68K, see kit_util.asm
void push(Value value) {
if (vm.sp >= (vm.stack + (STACK_MAX-1))) {
vm.hadStackoverflow = true;
return;
}
*vm.sp++ = value;
}
#endif
#define dropNpush(n,value) { \
vm.sp -= (n) - 1; \
vm.sp[-1] = (value); \
}
#define CHECK_ARITH_ERROR(op) \
if (errno != 0) { \
runtimeError("'%s' arithmetic error.", op); \
goto handleError; \
}
#define CHECK_LOX_STACK_OVERFLOW() \
if (vm.frameCount == FRAMES_MAX) { \
runtimeError("Lox call stack overflow."); \
return false; \
}
static bool callClosure(ObjClosure* closure, int argCount) {
CallFrame* frame;
ObjFunction* function = closure->function;
ObjList* args;
int itemCount;
int arity;
CHECK_LOX_STACK_OVERFLOW()
#ifdef LOX_DBG
if (vm.debug_trace_calls) {
indentCallTrace();
printf("--> %s (", functionName(function));
printArgList(argCount);
putstr(")\n");
}
#endif
arity = function->arity & ARITY_MASK;
if (function->arity & REST_PARM_MASK) {
if (argCount < arity - 1) {
runtimeError("'%s' expected %s%d arguments but got %d.",
functionName(function), "at least ", arity - 1, argCount);
return false;
}
itemCount = argCount - arity + 1;
args = makeList(itemCount, vm.sp - itemCount, itemCount, 1);
dropNpush(itemCount, OBJ_VAL(args));
}
else if (argCount != arity) {
runtimeError("'%s' expected %s%d arguments but got %d.",
functionName(function), "", arity, argCount);
return false;
}
frame = &vm.frames[vm.frameCount++];
frame->closure = closure;
frame->handler = NIL_VAL;
frame->ip = function->chunk.code;
frame->fp = vm.sp - arity - 1;
return true;
}
static bool callWithHandler(void) {
CallFrame* frame;
ObjClosure* closure = AS_CLOSURE(peek(1));
ObjFunction* function = closure->function;
CHECK_LOX_STACK_OVERFLOW()
if (!isCallable(peek(0))) {
runtimeError("Handler must be callable.");
return false;
}
#ifdef LOX_DBG
if (vm.debug_trace_calls) {
indentCallTrace();
printf("==> %s () handler ", functionName(function));
printValue(peek(0), PRTF_MACHINE | PRTF_EXPAND);
putstr("\n");
}
#endif
frame = &vm.frames[vm.frameCount++];
frame->closure = closure;
frame->handler = pop();
frame->ip = function->chunk.code;
frame->fp = vm.sp - 1;
return true;
}
static bool callBinding(Value varName) {
CallFrame* frame;
ObjClosure* closure = AS_CLOSURE(peek(0));
ObjFunction* function = closure->function;
CHECK_LOX_STACK_OVERFLOW()
#ifdef LOX_DBG
if (vm.debug_trace_calls) {
indentCallTrace();
printf("~~> %s () %s = ", functionName(function), AS_CSTRING(varName));
printValue(peek(1), PRTF_MACHINE | PRTF_EXPAND);
putstr("\n");
}
#endif
pushGlobal(varName, peek(1));
dropNpush(2, OBJ_VAL(closure));
frame = &vm.frames[vm.frameCount++];
frame->closure = closure;
frame->handler = varName;
frame->ip = function->chunk.code;
frame->fp = vm.sp - 1;
return true;
}
static bool callValue(Value callee, int argCount) {
const Native* native;
ObjClass* klass;
ObjBound* bound;
Value initializer = NIL_VAL;
if (IS_OBJ(callee)) {
switch (OBJ_TYPE(callee)) {
case OBJ_BOUND:
bound = AS_BOUND(callee);
vm.sp[-argCount - 1] = bound->receiver;
return callClosure(bound->method, argCount);
case OBJ_CLASS:
klass = AS_CLASS(callee);
vm.sp[-argCount - 1] = OBJ_VAL(makeInstance(klass));
if (tableGet(&klass->methods, OBJ_VAL(vm.initString), &initializer))
return callClosure(AS_CLOSURE(initializer), argCount);
else if (argCount != 0) {
runtimeError("'%s' expected %s%d arguments but got %d.",
AS_CSTRING(klass->name), "", 0, argCount);
return false;
}
return true;
case OBJ_CLOSURE:
return callClosure(AS_CLOSURE(callee), argCount);
case OBJ_NATIVE:
native = AS_NATIVE(callee);
#ifdef LOX_DBG
if (vm.debug_trace_natives) {
if (vm.debug_trace_calls)
indentCallTrace();
printf("--- %s (", native->name);
printArgList(argCount);
putstr(") -> ");
vm.log_native_result = true;
}
#endif
if (!callNative(native, argCount, vm.sp - argCount)) // don't update vm.sp yet!
return false;
vm.sp -= argCount;
#ifdef LOX_DBG
if (vm.log_native_result) {
printValue(vm.sp[-1], PRTF_MACHINE | PRTF_EXPAND);
putstr("\n");
vm.log_native_result = false;
}
#endif
return true;
}
}
runtimeError("Can't %s type %s.", "call", valueType(callee));
return false;
}
static bool invokeFromClass(ObjClass* klass, ObjString* name, int argCount) {
Value method = NIL_VAL;
if (!tableGet(&klass->methods, OBJ_VAL(name), &method)) {
runtimeError("Undefined property '%s'.", name->chars);
return false;
}
return callClosure(AS_CLOSURE(method), argCount);
}
static bool invoke(ObjString* name, int argCount) {
Value receiver = peek(argCount);
ObjInstance* instance;
Value value = NIL_VAL;
if (!IS_INSTANCE(receiver)) {
runtimeError("Only instances have %s.", "methods");
return false;
}
instance = AS_INSTANCE(receiver);
if (tableGet(&instance->fields, OBJ_VAL(name), &value)) {
vm.sp[-argCount - 1] = value;
return callValue(value, argCount);
}
return invokeFromClass(instance->klass, name, argCount);
}
static bool bindMethod(ObjClass* klass, ObjString* name) {
Value method = NIL_VAL;
ObjBound* bound;
if (!tableGet(&klass->methods, OBJ_VAL(name), &method)) {
runtimeError("Undefined property '%s'.", name->chars);
return false;
}
bound = makeBound(peek(0), AS_CLOSURE(method));
dropNpush(1, OBJ_VAL(bound));
return true;
}
static ObjUpvalue* captureUpvalue(Value* local) {
ObjUpvalue* prevUpvalue = NULL;
ObjUpvalue* upvalue = vm.openUpvalues;
ObjUpvalue* createdUpvalue;
while (upvalue != NULL && upvalue->location > local) {
prevUpvalue = upvalue;
upvalue = upvalue->nextUpvalue;
}
if (upvalue != NULL && upvalue->location == local)
return upvalue;
createdUpvalue = makeUpvalue(local);
createdUpvalue->nextUpvalue = upvalue;
if (prevUpvalue == NULL)
vm.openUpvalues = createdUpvalue;
else
prevUpvalue->nextUpvalue = createdUpvalue;
return createdUpvalue;
}
static void closeUpvalues(Value* last) {
ObjUpvalue* upvalue;
while (vm.openUpvalues != NULL && vm.openUpvalues->location >= last) {
upvalue = vm.openUpvalues;
upvalue->closed = *upvalue->location;
upvalue->location = &upvalue->closed;
vm.openUpvalues = upvalue->nextUpvalue;
}
}
static void defineMethod(ObjString* name) {
Value method = peek(0);
ObjClass* klass = AS_CLASS(peek(1));
ObjClosure* clos = AS_CLOSURE(method);
clos->function->klass = klass;
tableSet(&klass->methods, OBJ_VAL(name), method);
drop();
}
#define READ_BYTE() (*frame->ip++)
#define READ_USHORT() (frame->ip += 2, (frame->ip[-2] << 8) | frame->ip[-1])
#define CURR_INSTR() (frame->ip[-1])
static InterpretResult run(void) {
int index, begin, end, i;
Value constant;
// The IDE68K ancient C compiler generates wrong code for local vars in case branches.
// Thus, we declare all needed variables at function start..
Int aInt, bInt;
Real aReal, bReal;
Value aVal=NIL_VAL, bVal, cVal, resVal;
ObjString *aStr, *bStr, *resStr;
ObjList *aLst, *bLst, *resLst;
ObjIterator *aIt;
ObjClass *superclass, *subclass;
ObjInstance *instance;
int slotNr;
ObjFunction *function;
ObjClosure *closure;
int argCount, itemCount;
int offset;
int upvalue;
CallFrame *frame;
Value *consts;
vm.hadStackoverflow = false;
vm.handleException = false;
#ifdef LOX_DBG
vm.log_native_result = false;
vm.stepsExecuted = 0;
STATIC_BREAKPOINT();
#endif
updateFrame:
// Last op changed call frame, update cached values
frame = &vm.frames[vm.frameCount - 1];
consts = frame->closure->function->chunk.constants.values;
nextInst:
// Last op possibly caused stack overflow, check here
if (vm.hadStackoverflow) {
runtimeError("Lox value stack overflow.");
goto handleError;
}
nextInstNoSO:
// Last op guaranteed no stack overflow, omit check
if (INTERRUPTED()) {
(void)READ_BYTE();
putstr("Interrupted.\n");
printBacktrace();
return INTERPRET_INTERRUPTED;
}
#ifdef LOX_DBG
if (vm.debug_trace_steps) {
printStack();
disassembleInst(&frame->closure->function->chunk,
(int)(frame->ip - frame->closure->function->chunk.code));
}
++vm.stepsExecuted;
#endif
switch (READ_BYTE()) {
case OP_CONSTANT:
index = READ_BYTE();
constant = consts[index];
push(constant);
goto nextInst;
case OP_NIL: push(NIL_VAL); goto nextInst;
case OP_TRUE: push(TRUE_VAL); goto nextInst;
case OP_FALSE: push(FALSE_VAL); goto nextInst;
case OP_ZERO: push(INT_VAL(0)); goto nextInst;
case OP_ONE: push(INT_VAL(1)); goto nextInst;
case OP_POP: drop(); goto nextInstNoSO;
case OP_DUP: push(peek(0)); goto nextInst;
case OP_SWAP:
aVal = peek(0);
peek(0) = peek(1);
peek(1) = aVal;
goto nextInstNoSO;
case OP_GET_LOCAL:
slotNr = READ_BYTE();
push(frame->fp[slotNr]);
goto nextInst;
case OP_SET_LOCAL:
slotNr = READ_BYTE();
frame->fp[slotNr] = peek(0);
goto nextInstNoSO;
case OP_GET_GLOBAL:
index = READ_BYTE();
constant = consts[index];
if (!tableGet(&vm.globals, constant, &aVal)) {
runtimeError("Undefined variable '%s'.", AS_CSTRING(constant));
goto handleError;
}
if (IS_DYNVAR(aVal))
aVal = AS_DYNVAR(aVal)->current;
push(aVal);
goto nextInst;
case OP_DEF_GLOBAL:
index = READ_BYTE();
constant = consts[index];
tableSet(&vm.globals, constant, peek(0)); // not pushGlobal to avoid chains when redefining
drop();
goto nextInstNoSO;
case OP_SET_GLOBAL:
index = READ_BYTE();
constant = consts[index];
if (!setGlobal(constant, peek(0))) {
runtimeError("Undefined variable '%s'.", AS_CSTRING(constant));
goto handleError;
}
goto nextInstNoSO;
case OP_GET_UPVALUE:
slotNr = READ_BYTE();
push(*frame->closure->upvalues[slotNr]->location);
goto nextInst;
case OP_SET_UPVALUE:
slotNr = READ_BYTE();
*frame->closure->upvalues[slotNr]->location = peek(0);
goto nextInstNoSO;
case OP_GET_PROPERTY:
if (!IS_INSTANCE(peek(0))) {
runtimeError("Only instances have %s.", "properties");
goto handleError;
}
instance = AS_INSTANCE(peek(0));
index = READ_BYTE();
constant = consts[index];
if (tableGet(&instance->fields, constant, &aVal)) {
dropNpush(1, aVal);
goto nextInstNoSO;
}
aStr = AS_STRING(constant);
if (!bindMethod(instance->klass, aStr))
goto handleError;
goto nextInstNoSO;
case OP_SET_PROPERTY:
if (!IS_INSTANCE(peek(1))) {
runtimeError("Only instances have %s.", "properties");
goto handleError;
}
instance = AS_INSTANCE(peek(1));
index = READ_BYTE();
constant = consts[index];
tableSet(&instance->fields, constant, peek(0));
aVal = pop();
dropNpush(1, aVal);
goto nextInstNoSO;
case OP_GET_SUPER:
index = READ_BYTE();
constant = consts[index];
aStr = AS_STRING(constant);
superclass = AS_CLASS(pop());
if (!bindMethod(superclass, aStr))
goto handleError;
goto nextInstNoSO;
case OP_EQUAL:
bVal = pop();
dropNpush(1, BOOL_VAL(valuesEqual(peek(0), bVal)));
goto nextInstNoSO;
case OP_LESS:
if (IS_INT(peek(0))) {
if (IS_INT(peek(1))) {
bVal = pop();
dropNpush(1, BOOL_VAL(peek(0) < bVal)); // relying on Value tagging for int
goto nextInstNoSO;
} else if (IS_REAL(peek(1))) {
aReal = AS_REAL(peek(1));
bReal = intToReal(AS_INT(peek(0)));
goto lessReals;
} else goto typeErrorLess;
} else if (IS_REAL(peek(0))) {
bReal = AS_REAL(peek(0));
if (IS_INT(peek(1)))
aReal = intToReal(AS_INT(peek(1)));
else if (IS_REAL(peek(1)))
aReal = AS_REAL(peek(1));
else goto typeErrorLess;
lessReals:
dropNpush(2, BOOL_VAL(less(aReal,bReal)));
} else if (IS_STRING(peek(0)) && IS_STRING(peek(1))) {
bStr = AS_STRING(peek(0));
aStr = AS_STRING(peek(1));
dropNpush(2, BOOL_VAL(strcmp(aStr->chars, bStr->chars) < 0));
} else {
typeErrorLess:
runtimeError("Can't %s types %s and %s.", "order",
valueType(peek(1)), valueType(peek(0)));
goto handleError;
}
goto nextInstNoSO;
case OP_ADD:
if (IS_INT(peek(0))) {
if (IS_INT(peek(1))) {
bVal = pop();
dropNpush(1, peek(0) + bVal - 1); // relying on Value tagging for int
goto nextInstNoSO;
} else if (IS_REAL(peek(1))) {
aReal = AS_REAL(peek(1));
bReal = intToReal(AS_INT(peek(0)));
goto addReals;
} else goto typeErrorAdd;
} else if (IS_REAL(peek(0))) {
bReal = AS_REAL(peek(0));
if (IS_INT(peek(1)))
aReal = intToReal(AS_INT(peek(1)));
else if (IS_REAL(peek(1)))
aReal = AS_REAL(peek(1));
else goto typeErrorAdd;
addReals:
errno = 0;
dropNpush(2, makeReal(add(aReal,bReal)));
CHECK_ARITH_ERROR("+")
} else if (IS_STRING(peek(0)) && IS_STRING(peek(1))) {
bStr = AS_STRING(peek(0));
aStr = AS_STRING(peek(1));
resStr = concatStrings(aStr, bStr);
if (!resStr) {
runtimeError("'%s' stringbuffer overflow.", "+");
goto handleError;
}
dropNpush(2, OBJ_VAL(resStr));
} else if (IS_LIST(peek(0)) && IS_LIST(peek(1))) {
bLst = AS_LIST(peek(0));
aLst = AS_LIST(peek(1));
resLst = concatLists(aLst, bLst);
dropNpush(2, OBJ_VAL(resLst));
} else {
typeErrorAdd:
runtimeError("Can't %s types %s and %s.", "add",
valueType(peek(1)), valueType(peek(0)));
goto handleError;
}
goto nextInstNoSO;
case OP_SUB:
if (IS_INT(peek(0))) {
if (IS_INT(peek(1))) {
bVal = pop();
dropNpush(1, peek(0) - bVal + 1); // relying on Value tagging for int
goto nextInstNoSO;
} else if (IS_REAL(peek(1))) {
aReal = AS_REAL(peek(1));
bReal = intToReal(AS_INT(peek(0)));
} else goto typeErrorSub;
} else if (IS_REAL(peek(0))) {
bReal = AS_REAL(peek(0));
if (IS_INT(peek(1)))
aReal = intToReal(AS_INT(peek(1)));
else if (IS_REAL(peek(1)))
aReal = AS_REAL(peek(1));
else goto typeErrorSub;
} else {
typeErrorSub:
runtimeError("Can't %s types %s and %s.", "subtract",
valueType(peek(1)), valueType(peek(0)));
goto handleError;
}
errno = 0;
dropNpush(2, makeReal(sub(aReal,bReal)));
CHECK_ARITH_ERROR("-")
goto nextInstNoSO;
case OP_MUL:
if (IS_INT(peek(0))) {
if (IS_INT(peek(1))) {
bInt = AS_INT(pop());
dropNpush(1, INT_VAL(AS_INT(peek(0)) * bInt));
goto nextInstNoSO;
} else if (IS_REAL(peek(1))) {
aReal = AS_REAL(peek(1));
bReal = intToReal(AS_INT(peek(0)));
} else goto typeErrorMul;
} else if (IS_REAL(peek(0))) {
bReal = AS_REAL(peek(0));
if (IS_INT(peek(1)))
aReal = intToReal(AS_INT(peek(1)));
else if (IS_REAL(peek(1)))
aReal = AS_REAL(peek(1));
else goto typeErrorMul;
} else {
typeErrorMul:
runtimeError("Can't %s types %s and %s.", "multiply",
valueType(peek(1)), valueType(peek(0)));
goto handleError;
}
errno = 0;
dropNpush(2, makeReal(mul(aReal,bReal)));
CHECK_ARITH_ERROR("*")
goto nextInstNoSO;
case OP_DIV:
case OP_MOD:
if (IS_INT(peek(0))) {
if (IS_INT(peek(1))) {
bInt = AS_INT(pop());
aInt = AS_INT(pop());
if (bInt == 0) {
runtimeError("div by zero.");
goto handleError;
}
if (CURR_INSTR()==OP_DIV)
aInt = aInt / bInt;
else
aInt = aInt % bInt;
pushUnchecked(INT_VAL(aInt));
goto nextInstNoSO;
} else if (IS_REAL(peek(1))) {
aReal = AS_REAL(peek(1));
bReal = intToReal(AS_INT(peek(0)));
} else goto typeErrorDiv;
} else if (IS_REAL(peek(0))) {
bReal = AS_REAL(peek(0));
if (IS_INT(peek(1)))
aReal = intToReal(AS_INT(peek(1)));
else if (IS_REAL(peek(1)))
aReal = AS_REAL(peek(1));
else goto typeErrorDiv;
} else {
typeErrorDiv:
runtimeError("Can't %s types %s and %s.", "divide",
valueType(peek(1)), valueType(peek(0)));
goto handleError;
}
if (bReal == 0) {
runtimeError("div by zero.");
goto handleError;
}
errno = 0;
if (CURR_INSTR()==OP_DIV)
aReal = div(aReal,bReal);
else
aReal = mod(aReal,bReal);
dropNpush(2, makeReal(aReal));
CHECK_ARITH_ERROR("div")
goto nextInstNoSO;
case OP_NOT:
peek(0) = BOOL_VAL(IS_FALSEY(peek(0)));
goto nextInstNoSO;
case OP_PRINT:
printValue(pop(), PRTF_HUMAN | PRTF_EXPAND);
goto nextInstNoSO;
case OP_PRINTLN:
printValue(pop(), PRTF_HUMAN | PRTF_EXPAND);
putstr("\n");
goto nextInstNoSO;
case OP_PRINTQ:
printValue(pop(), PRTF_MACHINE | PRTF_EXPAND);
putstr("\n");
goto nextInstNoSO;
case OP_JUMP:
offset = READ_USHORT();
frame->ip += offset;
goto nextInstNoSO;
case OP_JUMP_OR:
offset = READ_USHORT();
if (IS_FALSEY(peek(0)))
drop();
else
frame->ip += offset;
goto nextInstNoSO;
case OP_JUMP_AND:
offset = READ_USHORT();
if (IS_FALSEY(peek(0)))
frame->ip += offset;
else
drop();
goto nextInstNoSO;
case OP_JUMP_TRUE:
offset = READ_USHORT();
if (!IS_FALSEY(pop()))
frame->ip += offset;
goto nextInstNoSO;
case OP_JUMP_FALSE:
offset = READ_USHORT();
if (IS_FALSEY(pop()))
frame->ip += offset;
goto nextInstNoSO;
case OP_LOOP:
offset = READ_USHORT();
frame->ip -= offset;
goto nextInstNoSO;
case OP_CALL0:
argCount = 0;
goto cont_call;
case OP_CALL1:
argCount = 1;
goto cont_call;
case OP_CALL2:
argCount = 2;
goto cont_call;
case OP_CALL:
argCount = READ_BYTE();
cont_call:
if (!callValue(peek(argCount), argCount))
goto handleError;
goto updateFrame;
case OP_VCALL:
argCount = READ_BYTE() + AS_INT(pop());
goto cont_call;
case OP_CALL_HAND:
if (!callWithHandler())
goto handleError;
goto updateFrame;
case OP_CALL_BIND:
index = READ_BYTE();
constant = consts[index];
if (!callBinding(constant))
goto handleError;
goto updateFrame;
case OP_INVOKE:
index = READ_BYTE();
argCount = READ_BYTE();
cont_invoke:
constant = consts[index];
aStr = AS_STRING(constant);
if (!invoke(aStr, argCount))
goto handleError;
goto updateFrame;
case OP_VINVOKE:
index = READ_BYTE();
argCount = READ_BYTE() + AS_INT(pop());
goto cont_invoke;
case OP_SUPER_INVOKE:
index = READ_BYTE();
superclass = AS_CLASS(pop());
argCount = READ_BYTE();
cont_super_invoke:
constant = consts[index];
aStr = AS_STRING(constant);
if (!invokeFromClass(superclass, aStr, argCount))
goto handleError;
goto updateFrame;
case OP_VSUPER_INVOKE:
index = READ_BYTE();
superclass = AS_CLASS(pop());
argCount = READ_BYTE() + AS_INT(pop());
goto cont_super_invoke;
case OP_CLOSURE:
index = READ_BYTE();
constant = consts[index];
function = AS_FUNCTION(constant);
closure = makeClosure(function);
push(OBJ_VAL(closure));
for (i = 0; i < closure->upvalueCount; i++) {
upvalue = READ_BYTE();
if (UV_ISLOC(upvalue))
closure->upvalues[i] = captureUpvalue(frame->fp + UV_INDEX(upvalue));
else
closure->upvalues[i] = frame->closure->upvalues[UV_INDEX(upvalue)];
}
goto nextInst;
case OP_CLOSE_UPVALUE:
closeUpvalues(vm.sp - 1);
drop();
goto nextInstNoSO;
case OP_RETURN_NIL:
resVal = NIL_VAL;
goto cont_ret;
case OP_RETURN:
resVal = pop();
cont_ret:
closeUpvalues(frame->fp);
if (IS_STRING(frame->handler))
popGlobal(frame->handler);
vm.frameCount--;
#ifdef LOX_DBG
if (vm.debug_trace_calls) {
indentCallTrace();
printf("<-- %s ", functionName(frame->closure->function));
printValue(resVal, PRTF_MACHINE | PRTF_EXPAND);
putstr("\n");
}
#endif
if (vm.frameCount == 0) {
drop();
return INTERPRET_OK;
}
vm.sp = frame->fp;
pushUnchecked(resVal);
goto updateFrame;
case OP_CLASS:
index = READ_BYTE();
constant = consts[index];
aStr = AS_STRING(constant);
push(OBJ_VAL(makeClass(aStr)));
goto nextInst;
case OP_INHERIT:
aVal = peek(1);
if (!IS_CLASS(aVal)) {
runtimeError("Can't %s type %s.", "inherit from", valueType(aVal));
goto handleError;
}
superclass = AS_CLASS(aVal);
subclass = AS_CLASS(peek(0));
if (superclass == subclass) {
runtimeError("Can't %s itself.", "inherit from");
goto handleError;
}
subclass->superClass = superclass;