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Cosmo
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WIP: removed stale error handling 

currently, scripts seem to run fine. however I'm a bit worried about stack related issues. maybe i'll need to reset state->top as well? but not entirely sure
This commit is contained in:
CPunch 2023-08-29 14:07:45 -05:00 committed by cpunch
parent 75d27afe2c
commit 0633e87aa6
9 changed files with 79 additions and 130 deletions
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2
Makefile
View File

@ -1,7 +1,7 @@
# make clean && make && ./bin/cosmo
CC=clang
CFLAGS=-fPIE -Wall -Isrc -O3 -std=c99
CFLAGS=-fPIE -Wall -Isrc -O3 -std=c99 #-g -fsanitize=address
LDFLAGS=-lm #-fsanitize=address
OUT=bin/cosmo

25
main.c
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@ -45,21 +45,20 @@ int cosmoB_input(CState *state, int nargs, CValue *args)
static bool interpret(CState *state, const char *script, const char *mod)
{
bool ret;
// cosmoV_compileString pushes the result onto the stack (COBJ_ERROR or COBJ_CLOSURE)
if (cosmoV_compileString(state, script, mod)) {
// 0 args being passed, 0 results expected
if (!cosmoV_call(state, 0, 0))
cosmoV_printError(state, state->error);
if (!cosmoV_pcall(state, 0, 0)) {
cosmoV_printError(state, cosmoV_readError(*cosmoV_pop(state)));
return false;
}
} else {
cosmoV_pop(state); // pop the error off the stack
cosmoV_printError(state, state->error);
cosmoV_printError(state, cosmoV_readError(*cosmoV_pop(state)));
return false;
}
ret = state->panic;
state->panic = false; // so our repl isn't broken
return !ret;
return true;
}
static void repl(CState *state)
@ -158,8 +157,7 @@ void compileScript(CState *state, const char *in, const char *out)
CObjFunction *func = cosmoV_readClosure(*cosmoV_getTop(state, 0))->function;
cosmoD_dump(state, func, fileWriter, (void *)fout);
} else {
cosmoV_pop(state); // pop the error off the stack
cosmoV_printError(state, state->error);
cosmoV_printError(state, cosmoV_readError(*cosmoV_pop(state)));
}
free(script);
@ -172,14 +170,13 @@ void loadScript(CState *state, const char *in)
{
FILE *file = fopen(in, "rb");
if (!cosmoV_undump(state, fileReader, file)) {
cosmoV_pop(state); // pop the error off the stack
cosmoV_printError(state, state->error);
cosmoV_printError(state, cosmoV_readError(*cosmoV_pop(state)));
return;
};
printf("[!] loaded %s!\n", in);
if (!cosmoV_call(state, 0, 0))
cosmoV_printError(state, state->error);
if (!cosmoV_pcall(state, 0, 0))
cosmoV_printError(state, cosmoV_readError(*cosmoV_pop(state)));
fclose(file);
}

3
src/cmem.c
View File

@ -288,9 +288,6 @@ static void markRoots(CState *state)
// mark the user defined roots
markUserRoots(state);
// mark other misc. internally reserved objects
markObject(state, (CObj *)state->error);
for (int i = 0; i < COBJ_MAX; i++)
markObject(state, (CObj *)state->protoObjects[i]);

27
src/cobj.c
View File

@ -164,14 +164,12 @@ _eqFail:
cosmoV_pushValue(state, eq1);
cosmoV_pushRef(state, obj1);
cosmoV_pushRef(state, obj2);
if (!cosmoV_call(state, 2, 1))
return false;
cosmoV_call(state, 2, 1);
// check return value and make sure it's a boolean
if (!IS_BOOLEAN(*cosmoV_getTop(state, 0))) {
cosmoV_error(state, "__equal expected to return <boolean>, got %s!",
cosmoV_typeStr(*cosmoV_pop(state)));
return false;
}
// return the result
@ -409,9 +407,8 @@ bool cosmoO_getRawObject(CState *state, CObjObject *proto, CValue key, CValue *v
cosmoT_get(state, &cosmoV_readTable(*val)->tbl, key, val)) {
cosmoV_pushValue(state, *val); // push function
cosmoV_pushRef(state, (CObj *)obj); // push object
if (!cosmoV_call(state, 1, 1)) // call the function with the 1 argument
return false;
*val = *cosmoV_pop(state); // set value to the return value of __index
cosmoV_call(state, 1, 1); // call the function with the 1 argument
*val = *cosmoV_pop(state); // set value to the return value of __index
return true;
}
@ -530,9 +527,8 @@ bool cosmoO_indexObject(CState *state, CObjObject *object, CValue key, CValue *v
cosmoV_pushValue(state, *val); // push function
cosmoV_pushRef(state, (CObj *)object); // push object
cosmoV_pushValue(state, key); // push key
if (!cosmoV_call(state, 2, 1)) // call the function with the 2 arguments
return false;
*val = *cosmoV_pop(state); // set value to the return value of __index
cosmoV_call(state, 2, 1); // call the function with the 2 arguments
*val = *cosmoV_pop(state); // set value to the return value of __index
return true;
} else { // there's no __index function defined!
cosmoV_error(state, "Couldn't index object without __index function!");
@ -550,7 +546,8 @@ bool cosmoO_newIndexObject(CState *state, CObjObject *object, CValue key, CValue
cosmoV_pushRef(state, (CObj *)object); // push object
cosmoV_pushValue(state, key); // push key & value pair
cosmoV_pushValue(state, val);
return cosmoV_call(state, 3, 0);
cosmoV_call(state, 3, 0);
return true;
} else { // there's no __newindex function defined
cosmoV_error(state, "Couldn't set index on object without __newindex function!");
}
@ -567,8 +564,7 @@ CObjString *cosmoO_toString(CState *state, CObj *obj)
if (protoObject != NULL && cosmoO_getIString(state, protoObject, ISTRING_TOSTRING, &res)) {
cosmoV_pushValue(state, res);
cosmoV_pushRef(state, (CObj *)obj);
if (!cosmoV_call(state, 1, 1))
return cosmoO_copyString(state, "<err>", 5);
cosmoV_call(state, 1, 1);
// make sure the __tostring function returned a string
StkPtr ret = cosmoV_getTop(state, 0);
@ -633,14 +629,12 @@ cosmo_Number cosmoO_toNumber(CState *state, CObj *obj)
if (proto != NULL && cosmoO_getIString(state, proto, ISTRING_TONUMBER, &res)) {
cosmoV_pushValue(state, res);
cosmoV_pushRef(state, (CObj *)obj);
if (!cosmoV_call(state, 1, 1)) // call res, expect 1 return val of <number>
return 0;
cosmoV_call(state, 1, 1); // call res, expect 1 return val of <number>
StkPtr temp = cosmoV_getTop(state, 0);
if (!IS_NUMBER(*temp)) {
cosmoV_error(state, "__tonumber expected to return <number>, got %s!",
cosmoV_typeStr(*temp));
return 0;
}
// return number
@ -666,8 +660,7 @@ int cosmoO_count(CState *state, CObj *obj)
if (proto != NULL && cosmoO_getIString(state, proto, ISTRING_COUNT, &res)) {
cosmoV_pushValue(state, res);
cosmoV_pushRef(state, (CObj *)obj);
if (!cosmoV_call(state, 1, 1)) // call res, we expect 1 return value of type <number>
return 0;
cosmoV_call(state, 1, 1); // call res, we expect 1 return value of type <number>
StkPtr ret = cosmoV_getTop(state, 0);
if (!IS_NUMBER(*ret)) {

1
src/cobj.h
View File

@ -136,6 +136,7 @@ struct CObjUpval
#define cosmoV_readCFunction(x) (((CObjCFunction *)cosmoV_readRef(x))->cfunc)
#define cosmoV_readMethod(x) ((CObjMethod *)cosmoV_readRef(x))
#define cosmoV_readClosure(x) ((CObjClosure *)cosmoV_readRef(x))
#define cosmoV_readError(x) ((CObjError *)cosmoV_readRef(x))
#define cosmoO_readCString(x) ((CObjString *)x)->str
#define cosmoO_readType(x) ((CObj *)x)->type

5
src/cstate.c
View File

@ -12,6 +12,7 @@ CPanic *cosmoV_newPanic(CState *state)
CPanic *panic = cosmoM_xmalloc(state, sizeof(CPanic));
panic->prev = state->panic;
state->panic = panic;
return panic;
}
@ -19,6 +20,7 @@ void cosmoV_freePanic(CState *state)
{
CPanic *panic = state->panic;
state->panic = panic->prev;
cosmoM_free(state, CPanic, panic);
}
@ -32,7 +34,6 @@ CState *cosmoV_newState()
exit(1);
}
state->panic = false;
state->freezeGC = 1; // we start frozen
state->panic = NULL;
@ -50,8 +51,6 @@ CState *cosmoV_newState()
state->frameCount = 0;
state->openUpvalues = NULL;
state->error = NULL;
// set default proto objects
for (int i = 0; i < COBJ_MAX; i++)
state->protoObjects[i] = NULL;

1
src/cstate.h
View File

@ -52,7 +52,6 @@ struct CState
int frameCount;
CPanic *panic;
CObjError *error; // NULL, unless panic is true
CObj *objects; // tracks all of our allocated objects
CObj *userRoots; // user definable roots, this holds CObjs that should be considered "roots",
// lets the VM know you are holding a reference to a CObj in your code

131
src/cvm.c
View File

@ -10,17 +10,7 @@
#include <stdarg.h>
#include <string.h>
bool cosmoV_protect(CState *state)
{
CPanic *panic = cosmoV_newPanic(state);
if (setjmp(panic->jmp) == 0) {
return 1;
}
cosmoV_freePanic(state);
return 0;
}
#define cosmoV_protect(panic) setjmp(panic->jmp) == 0
COSMO_API void cosmoV_pushFString(CState *state, const char *format, ...)
{
@ -48,9 +38,6 @@ COSMO_API bool cosmoV_undump(CState *state, cosmo_Reader reader, const void *ud)
CObjFunction *func;
if (cosmoD_undump(state, reader, ud, &func)) {
// fail recovery
state->panic = false;
cosmoV_pushRef(state, (CObj *)state->error);
return false;
};
@ -65,24 +52,29 @@ COSMO_API bool cosmoV_undump(CState *state, cosmo_Reader reader, const void *ud)
return true;
}
// returns false if failed, error will be on the top of the stack. true if successful, closure will
// be on the top of the stack
COSMO_API bool cosmoV_compileString(CState *state, const char *src, const char *name)
{
CObjFunction *func;
if (cosmoV_protect(state)) {
if ((func = cosmoP_compileString(state, src, name)) != NULL) {
// success
CPanic *panic = cosmoV_newPanic(state);
if (cosmoV_protect(panic)) {
func = cosmoP_compileString(state, src, name);
#ifdef VM_DEBUG
disasmChunk(&func->chunk, func->module->str, 0);
disasmChunk(&func->chunk, func->module->str, 0);
#endif
// push function onto the stack so it doesn't it cleaned up by the GC, at the same stack
// location put our closure
cosmoV_pushRef(state, (CObj *)func);
*(cosmoV_getTop(state, 0)) = cosmoV_newRef(cosmoO_newClosure(state, func));
return true;
}
cosmoV_freePanic(state);
// push function onto the stack so it doesn't it cleaned up by the GC, at the same stack
// location put our closure
cosmoV_pushRef(state, (CObj *)func);
*(cosmoV_getTop(state, 0)) = cosmoV_newRef(cosmoO_newClosure(state, func));
return true;
}
cosmoV_freePanic(state);
return false;
}
@ -244,18 +236,16 @@ void cosmoV_concat(CState *state, int vals)
}
int cosmoV_execute(CState *state);
bool invokeMethod(CState *state, CObj *obj, CValue func, int args, int nresults, int offset);
void invokeMethod(CState *state, CObj *obj, CValue func, int args, int nresults, int offset);
/*
calls a native C Function with # args on the stack, nresults are pushed onto the stack upon
return.
return.
returns:
false: state paniced during C Function, error is at state->error
true: state->top is moved to base + offset + nresults, with nresults pushed onto the stack
from base + offset
state->top is moved to base + offset + nresults, with nresults pushed onto the stack
from base + offset
*/
static bool callCFunction(CState *state, CosmoCFunction cfunc, int args, int nresults, int offset)
static void callCFunction(CState *state, CosmoCFunction cfunc, int args, int nresults, int offset)
{
StkPtr savedBase = cosmoV_getTop(state, args);
@ -267,13 +257,8 @@ static bool callCFunction(CState *state, CosmoCFunction cfunc, int args, int nre
// remember where the return values are
StkPtr results = cosmoV_getTop(state, nres - 1);
state->top = savedBase + offset; // set stack
// if the state paniced during the c function, return false
if (state->panic)
return false;
// push the return value back onto the stack
memmove(state->top, results,
sizeof(CValue) * nres); // copies the return values to the top of the stack
@ -282,20 +267,16 @@ static bool callCFunction(CState *state, CosmoCFunction cfunc, int args, int nre
// now, if the caller function expected more return values, push nils onto the stack
for (int i = nres; i < nresults; i++)
cosmoV_pushValue(state, cosmoV_newNil());
return true;
}
/*
calls a raw closure object with # args on the stack, nresults are pushed onto the stack upon
return.
return.
returns:
false: state paniced, error is at state->error
true: stack->top is moved to base + offset + nresults, with nresults pushed onto the stack
from base + offset
stack->top is moved to base + offset + nresults, with nresults pushed onto the stack
from base + offset
*/
static bool rawCall(CState *state, CObjClosure *closure, int args, int nresults, int offset)
static void rawCall(CState *state, CObjClosure *closure, int args, int nresults, int offset)
{
CObjFunction *func = closure->function;
@ -319,7 +300,6 @@ static bool rawCall(CState *state, CObjClosure *closure, int args, int nresults,
cosmoV_error(state, "Expected %d arguments for %s, got %d!", closure->function->args,
closure->function->name == NULL ? UNNAMEDCHUNK : closure->function->name->str,
args);
return false;
} else {
// load function into callframe
pushCallFrame(state, closure, func->args);
@ -337,9 +317,6 @@ static bool rawCall(CState *state, CObjClosure *closure, int args, int nresults,
// pop the callframe and return results :)
popCallFrame(state, offset);
if (state->panic) // panic state
return false;
// push the return values back onto the stack
for (int i = 0; i < nres; i++) {
state->top[i] = results[i];
@ -349,12 +326,10 @@ static bool rawCall(CState *state, CObjClosure *closure, int args, int nresults,
// now, if the caller function expected more return values, push nils onto the stack
for (int i = nres; i < nresults; i++)
cosmoV_pushValue(state, cosmoV_newNil());
return true;
}
// returns true if successful, false if error
bool callCValue(CState *state, CValue func, int args, int nresults, int offset)
void callCValue(CState *state, CValue func, int args, int nresults, int offset)
{
#ifdef VM_DEBUG
printf("\n");
@ -365,17 +340,19 @@ bool callCValue(CState *state, CValue func, int args, int nresults, int offset)
if (!IS_REF(func)) {
cosmoV_error(state, "Cannot call non-callable type %s!", cosmoV_typeStr(func));
return false;
}
switch (cosmoV_readRef(func)->type) {
case COBJ_CLOSURE:
return rawCall(state, cosmoV_readClosure(func), args, nresults, offset);
rawCall(state, cosmoV_readClosure(func), args, nresults, offset);
break;
case COBJ_CFUNCTION:
return callCFunction(state, cosmoV_readCFunction(func), args, nresults, offset);
callCFunction(state, cosmoV_readCFunction(func), args, nresults, offset);
break;
case COBJ_METHOD: {
CObjMethod *method = (CObjMethod *)cosmoV_readRef(func);
return invokeMethod(state, method->obj, method->func, args, nresults, offset + 1);
invokeMethod(state, method->obj, method->func, args, nresults, offset + 1);
break;
}
case COBJ_OBJECT: { // object is being instantiated, making another object
CObjObject *protoObj = (CObjObject *)cosmoV_readRef(func);
@ -388,12 +365,10 @@ bool callCValue(CState *state, CValue func, int args, int nresults, int offset)
// check if they defined an initializer (we accept 0 return values)
if (cosmoO_getIString(state, protoObj, ISTRING_INIT, &ret)) {
if (!invokeMethod(state, (CObj *)newObj, ret, args, 0, offset + 1))
return false;
invokeMethod(state, (CObj *)newObj, ret, args, 0, offset + 1);
} else {
// no default initializer
cosmoV_error(state, "Expected __init() in proto, object cannot be instantiated!");
return false;
}
if (nresults > 0) {
@ -409,19 +384,16 @@ bool callCValue(CState *state, CValue func, int args, int nresults, int offset)
}
default:
cosmoV_error(state, "Cannot call non-callable type %s!", cosmoV_typeStr(func));
return false;
}
return true;
}
bool invokeMethod(CState *state, CObj *obj, CValue func, int args, int nresults, int offset)
void invokeMethod(CState *state, CObj *obj, CValue func, int args, int nresults, int offset)
{
// first, set the first argument to the object
StkPtr temp = cosmoV_getTop(state, args);
*temp = cosmoV_newRef(obj);
return callCValue(state, func, args + 1, nresults, offset);
callCValue(state, func, args + 1, nresults, offset);
}
// wraps cosmoV_call in a protected state, CObjError will be pushed onto the stack if function call
@ -429,22 +401,22 @@ bool invokeMethod(CState *state, CObj *obj, CValue func, int args, int nresults,
// returns false if function call failed, true if function call succeeded
bool cosmoV_pcall(CState *state, int args, int nresults)
{
if (cosmoV_protect(state)) {
CPanic *panic = cosmoV_newPanic(state);
if (cosmoV_protect(panic)) {
cosmoV_call(state, args, nresults);
cosmoV_freePanic(state);
return true;
} else {
printf("caught panic!\n");
// restore panic state
state->panic = false;
// if cosmoV_protect returns false, the error is already on the top of the stack
if (nresults > 0) {
cosmoV_pushRef(state, (CObj *)state->error);
// push other expected results onto the stack
for (int i = 0; i < nresults - 1; i++)
cosmoV_pushValue(state, cosmoV_newNil());
}
cosmoV_freePanic(state);
return false;
}
}
@ -452,11 +424,11 @@ bool cosmoV_pcall(CState *state, int args, int nresults)
// calls a callable object at stack->top - args - 1, passing the # of args to the callable, and
// ensuring nresults are returned
// returns false if an error was thrown, else true if successful
bool cosmoV_call(CState *state, int args, int nresults)
void cosmoV_call(CState *state, int args, int nresults)
{
StkPtr val = cosmoV_getTop(state, args); // function will always be right above the args
return callCValue(state, *val, args, nresults, 0);
callCValue(state, *val, args, nresults, 0);
}
static inline bool isFalsey(StkPtr val)
@ -732,7 +704,7 @@ int cosmoV_execute(CState *state)
CCallFrame *frame = &state->callFrame[state->frameCount - 1]; // grabs the current frame
CValue *constants = frame->closure->function->chunk.constants.values; // cache the pointer :)
while (!state->panic) {
for (;;) {
#ifdef VM_DEBUG
cosmoV_printStack(state);
disasmInstr(&frame->closure->function->chunk,
@ -816,9 +788,7 @@ int cosmoV_execute(CState *state)
{
uint8_t args = READBYTE(frame);
uint8_t nres = READBYTE(frame);
if (!cosmoV_call(state, args, nres)) {
return -1;
}
cosmoV_call(state, args, nres);
}
CASE(OP_CLOSURE) :
{
@ -1043,10 +1013,9 @@ int cosmoV_execute(CState *state)
cosmoV_pop(state); // pop the object from the stack
cosmoV_pushValue(state, val);
cosmoV_pushRef(state, (CObj *)obj);
if (!cosmoV_call(
state, 1,
1)) // we expect 1 return value on the stack, the iterable object
return -1;
cosmoV_call(
state, 1,
1); // we expect 1 return value on the stack, the iterable object
StkPtr iObj = cosmoV_getTop(state, 0);
@ -1104,8 +1073,7 @@ int cosmoV_execute(CState *state)
}
cosmoV_pushValue(state, *temp);
if (!cosmoV_call(state, 0, nresults))
return -1;
cosmoV_call(state, 0, nresults);
if (IS_NIL(*(cosmoV_getTop(
state, 0)))) { // __next returned a nil, which means to exit the loop
@ -1363,7 +1331,6 @@ int cosmoV_execute(CState *state)
}
}
// we'll only reach this if state->panic is true
return -1;
}

14
src/cvm.h
View File

@ -13,16 +13,19 @@
cosmoV_execute by about 20% from benchmarking. of course, if you know
your compiler supports computed gotos, you can define VM_JUMPTABLE
although, this is disabled when VM_DEBUG is defined, since it can cause
issues with debugging
BTW: be weary of maliciously crafted cosmo dumps!! it's very easy to crash
cosmo with this enabled and reading invalid opcodes due to us just using the
opcode as an index into the jump table
*/
#if defined(__GNUC__) || defined(__clang__)
#if (defined(__GNUC__) || defined(__clang__)) && !defined(VM_DEBUG)
# define VM_JUMPTABLE
#endif
// args = # of pass parameters, nresults = # of expected results
COSMO_API bool cosmoV_call(CState *state, int args, int nresults);
COSMO_API void cosmoV_call(CState *state, int args, int nresults);
COSMO_API bool cosmoV_pcall(CState *state, int args, int nresults);
// pushes new object onto the stack & returns a pointer to the new object
@ -97,13 +100,6 @@ static inline void cosmoV_pushValue(CState *state, CValue val)
// we reserve 8 slots for the error string and whatever c api we might be in
if (stackSize >= STACK_MAX - 8) {
if (state->panic) { // we're in a panic state, let the 8 reserved slots be filled
if (stackSize < STACK_MAX)
*(state->top++) = val;
return;
}
cosmoV_error(state, "Stack overflow!");
return;
}