+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
#include "nasal.h"
#include "code.h"
////////////////////////////////////////////////////////////////////////
// Debugging stuff. ////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
-//#define DEBUG_NASAL
-#if !defined(DEBUG_NASAL)
+//#define INTERPRETER_DUMP
+#if !defined(INTERPRETER_DUMP)
# define DBG(expr) /* noop */
#else
# define DBG(expr) expr
#endif
char* opStringDEBUG(int op);
void printOpDEBUG(int ip, int op);
-void printStackDEBUG(struct Context* ctx);
+void printStackDEBUG(naContext ctx);
////////////////////////////////////////////////////////////////////////
struct Globals* globals = 0;
-static naRef bindFunction(struct Context* ctx, struct Frame* f, naRef code);
+static naRef bindFunction(naContext ctx, struct Frame* f, naRef code);
#define ERR(c, msg) naRuntimeError((c),(msg))
-void naRuntimeError(struct Context* c, char* msg)
-{
- c->error = msg;
+void naRuntimeError(naContext c, const char* fmt, ...)
+{
+ va_list ap;
+ va_start(ap, fmt);
+ vsnprintf(c->error, sizeof(c->error), fmt, ap);
+ va_end(ap);
longjmp(c->jumpHandle, 1);
}
-static int boolify(struct Context* ctx, naRef r)
+void naRethrowError(naContext subc)
+{
+ strncpy(subc->callParent->error, subc->error, sizeof(subc->error));
+ subc->callParent->dieArg = subc->dieArg;
+ longjmp(subc->callParent->jumpHandle, 1);
+}
+
+#define END_PTR ((void*)1)
+#define IS_END(r) (IS_REF((r)) && PTR((r)).obj == END_PTR)
+static naRef endToken()
+{
+ naRef r;
+ SETPTR(r, END_PTR);
+ return r;
+}
+
+static int boolify(naContext ctx, naRef r)
{
if(IS_NUM(r)) return r.num != 0;
- if(IS_NIL(r)) return 0;
+ if(IS_NIL(r) || IS_END(r)) return 0;
if(IS_STR(r)) {
double d;
if(naStr_len(r) == 0) return 0;
return 0;
}
-static double numify(struct Context* ctx, naRef o)
+static double numify(naContext ctx, naRef o)
{
double n;
if(IS_NUM(o)) return o.num;
return 0;
}
-static naRef stringify(struct Context* ctx, naRef r)
+static naRef stringify(naContext ctx, naRef r)
{
if(IS_STR(r)) return r;
if(IS_NUM(r)) return naStr_fromnum(naNewString(ctx), r.num);
return naNil();
}
-static int checkVec(struct Context* ctx, naRef vec, naRef idx)
+static int checkVec(naContext ctx, naRef vec, naRef idx)
{
int i = (int)numify(ctx, idx);
if(i < 0) i += naVec_size(vec);
- if(i < 0 || i >= naVec_size(vec)) ERR(ctx, "vector index out of bounds");
+ if(i < 0 || i >= naVec_size(vec))
+ naRuntimeError(ctx, "vector index %d out of bounds (size: %d)",
+ i, naVec_size(vec));
return i;
}
-static int checkStr(struct Context* ctx, naRef str, naRef idx)
+static int checkStr(naContext ctx, naRef str, naRef idx)
{
int i = (int)numify(ctx, idx);
if(i < 0) i += naStr_len(str);
- if(i < 0 || i >= naStr_len(str)) ERR(ctx, "string index out of bounds");
+ if(i < 0 || i >= naStr_len(str))
+ naRuntimeError(ctx, "string index %d out of bounds (size: %d)",
+ i, naStr_len(str));
return i;
}
-static naRef containerGet(struct Context* ctx, naRef box, naRef key)
+static naRef containerGet(naContext ctx, naRef box, naRef key)
{
naRef result = naNil();
if(!IS_SCALAR(key)) ERR(ctx, "container index not scalar");
- if(IS_HASH(box)) {
- if(!naHash_get(box, key, &result))
- ERR(ctx, "undefined value in container");
- } else if(IS_VEC(box)) {
+ if(IS_HASH(box))
+ naHash_get(box, key, &result);
+ else if(IS_VEC(box))
result = naVec_get(box, checkVec(ctx, box, key));
- } else if(IS_STR(box)) {
+ else if(IS_STR(box))
result = naNum((unsigned char)naStr_data(box)[checkStr(ctx, box, key)]);
- } else {
+ else
ERR(ctx, "extract from non-container");
- }
return result;
}
-static void containerSet(struct Context* ctx, naRef box, naRef key, naRef val)
+static void containerSet(naContext ctx, naRef box, naRef key, naRef val)
{
if(!IS_SCALAR(key)) ERR(ctx, "container index not scalar");
else if(IS_HASH(box)) naHash_set(box, key, val);
else if(IS_VEC(box)) naVec_set(box, checkVec(ctx, box, key), val);
else if(IS_STR(box)) {
- if(box.ref.ptr.str->hashcode)
+ if(PTR(box).str->hashcode)
ERR(ctx, "cannot change immutable string");
naStr_data(box)[checkStr(ctx, box, key)] = (char)numify(ctx, val);
} else ERR(ctx, "insert into non-container");
}
-static void initTemps(struct Context* c)
+static void initTemps(naContext c)
{
c->tempsz = 4;
c->temps = naAlloc(c->tempsz * sizeof(struct naObj*));
c->ntemps = 0;
}
-static void initContext(struct Context* c)
+static void initContext(naContext c)
{
int i;
c->fTop = c->opTop = c->markTop = 0;
c->callParent = 0;
c->callChild = 0;
c->dieArg = naNil();
- c->error = 0;
+ c->error[0] = 0;
+ c->userData = 0;
}
static void initGlobals()
{
int i;
- struct Context* c;
+ naContext c;
globals = (struct Globals*)naAlloc(sizeof(struct Globals));
naBZero(globals, sizeof(struct Globals));
naFreeContext(c);
}
-struct Context* naNewContext()
+naContext naNewContext()
{
- struct Context* c;
+ naContext c;
if(globals == 0)
initGlobals();
initContext(c);
} else {
UNLOCK();
- c = (struct Context*)naAlloc(sizeof(struct Context));
+ c = (naContext)naAlloc(sizeof(struct Context));
initTemps(c);
initContext(c);
LOCK();
return c;
}
-void naFreeContext(struct Context* c)
+naContext naSubContext(naContext super)
+{
+ naContext ctx = naNewContext();
+ if(super->callChild) naFreeContext(super->callChild);
+ ctx->callParent = super;
+ super->callChild = ctx;
+ return ctx;
+}
+
+void naFreeContext(naContext c)
{
c->ntemps = 0;
+ if(c->callChild) naFreeContext(c->callChild);
+ if(c->callParent) c->callParent->callChild = 0;
LOCK();
c->nextFree = globals->freeContexts;
globals->freeContexts = c;
UNLOCK();
}
-#if 0
-/*
- * This is the original code which might not work properly on all
- * platforms since it allows one to work on the same variable in one
- * statement without the prior knowledge how this will behave.
- *
- * e.g. ctx->opStack[ctx->opTop++] = ctx->opStack[ctx->opTop-1];
- * ^^^^^ ^^^^^
- */
-# define PUSH(r) do { \
+// Note that opTop is incremented separately, to avoid situations
+// where the "r" expression also references opTop. The SGI compiler
+// is known to have issues with such code.
+#define PUSH(r) do { \
if(ctx->opTop >= MAX_STACK_DEPTH) ERR(ctx, "stack overflow"); \
- ctx->opStack[ctx->opTop++] = r; \
+ ctx->opStack[ctx->opTop] = r; \
+ ctx->opTop++; \
} while(0)
-#else
-
-# define PUSH(r) _PUSH((ctx), (r))
-void _PUSH(struct Context* ctx, naRef r) {
- if(ctx->opTop >= MAX_STACK_DEPTH) ERR(ctx, "stack overflow");
- ctx->opStack[ctx->opTop++] = r;
-}
-#endif
-
static void setupArgs(naContext ctx, struct Frame* f, naRef* args, int nargs)
{
int i;
- struct naCode* c = f->func.ref.ptr.func->code.ref.ptr.code;
+ struct naCode* c = PTR(PTR(f->func).func->code).code;
// Set the argument symbols, and put any remaining args in a vector
- if(nargs < c->nArgs) ERR(ctx, "not enough arguments to function call");
+ if(nargs < c->nArgs)
+ naRuntimeError(ctx, "too few function args (have %d need %d)",
+ nargs, c->nArgs);
for(i=0; i<c->nArgs; i++)
- naHash_newsym(f->locals.ref.ptr.hash,
- &c->constants[c->argSyms[i]], &args[i]);
+ naiHash_newsym(PTR(f->locals).hash,
+ &c->constants[ARGSYMS(c)[i]], &args[i]);
args += c->nArgs;
nargs -= c->nArgs;
for(i=0; i<c->nOptArgs; i++, nargs--) {
- naRef val = nargs > 0 ? args[i] : c->constants[c->optArgVals[i]];
+ naRef val = nargs > 0 ? args[i] : c->constants[OPTARGVALS(c)[i]];
if(IS_CODE(val))
val = bindFunction(ctx, &ctx->fStack[ctx->fTop-2], val);
- naHash_newsym(f->locals.ref.ptr.hash, &c->constants[c->optArgSyms[i]],
+ naiHash_newsym(PTR(f->locals).hash, &c->constants[OPTARGSYMS(c)[i]],
&val);
}
args += c->nOptArgs;
if(c->needArgVector || nargs > 0) {
- naRef argsv = naNewVector(ctx);
- naVec_setsize(argsv, nargs > 0 ? nargs : 0);
+ naRef argv = naNewVector(ctx);
+ naVec_setsize(argv, nargs > 0 ? nargs : 0);
for(i=0; i<nargs; i++)
- argsv.ref.ptr.vec->rec->array[i] = *args++;
- naHash_newsym(f->locals.ref.ptr.hash, &c->restArgSym, &argsv);
+ PTR(argv).vec->rec->array[i] = *args++;
+ naiHash_newsym(PTR(f->locals).hash, &c->constants[c->restArgSym], &argv);
+ }
+}
+
+static void checkNamedArgs(naContext ctx, struct naCode* c, struct naHash* h)
+{
+ int i;
+ naRef sym, rest, dummy;
+ for(i=0; i<c->nArgs; i++) {
+ sym = c->constants[ARGSYMS(c)[i]];
+ if(!naiHash_sym(h, PTR(sym).str, &dummy))
+ naRuntimeError(ctx, "Missing arg: %s", naStr_data(sym));
+ }
+ for(i=0; i<c->nOptArgs; i++) {
+ sym = c->constants[OPTARGSYMS(c)[i]];
+ if(!naiHash_sym(h, PTR(sym).str, &dummy))
+ naiHash_newsym(h, &sym, &c->constants[OPTARGVALS(c)[i]]);
+ }
+ if(c->needArgVector) {
+ sym = c->constants[c->restArgSym];
+ if(!naiHash_sym(h, PTR(sym).str, &dummy)) {
+ rest = naNewVector(ctx);
+ naiHash_newsym(h, &sym, &rest);
+ }
}
}
-struct Frame* setupFuncall(struct Context* ctx, int nargs, int mcall, int tail)
+static struct Frame* setupFuncall(naContext ctx, int nargs, int mcall, int named)
{
- naRef *frame;
+ naRef *args, func, code, obj = naNil();
struct Frame* f;
-
- DBG(printf("setupFuncall(nargs:%d, mcall:%d)\n", nargs, mcall);)
-
- frame = &ctx->opStack[ctx->opTop - nargs - 1];
- if(!IS_FUNC(frame[0]))
- ERR(ctx, "function/method call invoked on uncallable object");
-
- // Just do native calls right here, and don't touch the stack
- // frames; return the current one (unless it's a tail call!).
- if(frame[0].ref.ptr.func->code.ref.ptr.obj->type == T_CCODE) {
- naRef obj = mcall ? frame[-1] : naNil();
- naCFunction fp = frame[0].ref.ptr.func->code.ref.ptr.ccode->fptr;
- naRef result = (*fp)(ctx, obj, nargs, frame + 1);
- ctx->opTop -= nargs + 1 + mcall;
+ int opf = ctx->opTop - nargs;
+
+ args = &ctx->opStack[opf];
+ func = ctx->opStack[--opf];
+ if(!IS_FUNC(func)) ERR(ctx, "function/method call on uncallable object");
+ code = PTR(func).func->code;
+ if(mcall) obj = ctx->opStack[--opf];
+ ctx->opFrame = opf;
+
+ if(IS_CCODE(code)) {
+ naRef result = (*PTR(code).ccode->fptr)(ctx, obj, nargs, args);
+ if(named) ERR(ctx, "native functions have no named arguments");
+ ctx->opTop = ctx->opFrame;
PUSH(result);
return &(ctx->fStack[ctx->fTop-1]);
}
- if(tail) ctx->fTop--;
- else if(ctx->fTop >= MAX_RECURSION) ERR(ctx, "call stack overflow");
-
- // Note: assign nil first, otherwise the naNew() can cause a GC,
- // which will now (after fTop++) see the *old* reference as a
- // markable value!
- f = &(ctx->fStack[ctx->fTop++]);
- f->locals = f->func = naNil();
- f->locals = naNewHash(ctx);
- f->func = frame[0];
+ if(ctx->fTop >= MAX_RECURSION) ERR(ctx, "call stack overflow");
+
+ f = &(ctx->fStack[ctx->fTop]);
+ f->locals = named ? args[0] : naNewHash(ctx);
+ f->func = func;
f->ip = 0;
- f->bp = ctx->opTop - (nargs + 1 + mcall);
+ f->bp = ctx->opFrame;
- if(mcall)
- naHash_set(f->locals, globals->meRef, frame[-1]);
+ if(mcall) naHash_set(f->locals, globals->meRef, obj);
- setupArgs(ctx, f, frame+1, nargs);
+ if(named) checkNamedArgs(ctx, PTR(code).code, PTR(f->locals).hash);
+ else setupArgs(ctx, f, args, nargs);
- ctx->opTop = f->bp; // Pop the stack last, to avoid GC lossage
- DBG(printf("Entering frame %d with %d args\n", ctx->fTop-1, nargs);)
+ ctx->fTop++;
+ ctx->opTop = f->bp; /* Pop the stack last, to avoid GC lossage */
return f;
}
-static naRef evalAndOr(struct Context* ctx, int op, naRef ra, naRef rb)
-{
- int a = boolify(ctx, ra);
- int b = boolify(ctx, rb);
- int result;
- if(op == OP_AND) result = a && b ? 1 : 0;
- else result = a || b ? 1 : 0;
- return naNum(result);
-}
-
static naRef evalEquality(int op, naRef ra, naRef rb)
{
int result = naEqual(ra, rb);
return naNum((op==OP_EQ) ? result : !result);
}
+static naRef evalCat(naContext ctx, naRef l, naRef r)
+{
+ if(IS_VEC(l) && IS_VEC(r)) {
+ int i, ls = naVec_size(l), rs = naVec_size(r);
+ naRef v = naNewVector(ctx);
+ naVec_setsize(v, ls + rs);
+ for(i=0; i<ls; i+=1) naVec_set(v, i, naVec_get(l, i));
+ for(i=0; i<rs; i+=1) naVec_set(v, i+ls, naVec_get(r, i));
+ return v;
+ } else {
+ naRef a = stringify(ctx, l);
+ naRef b = stringify(ctx, r);
+ return naStr_concat(naNewString(ctx), a, b);
+ }
+}
+
// When a code object comes out of the constant pool and shows up on
// the stack, it needs to be bound with the lexical context.
-static naRef bindFunction(struct Context* ctx, struct Frame* f, naRef code)
+static naRef bindFunction(naContext ctx, struct Frame* f, naRef code)
{
naRef result = naNewFunc(ctx, code);
- result.ref.ptr.func->namespace = f->locals;
- result.ref.ptr.func->next = f->func;
+ PTR(result).func->namespace = f->locals;
+ PTR(result).func->next = f->func;
return result;
}
{
while(c) {
if(naHash_get(c->namespace, sym, result)) return 1;
- c = c->next.ref.ptr.func;
+ c = PTR(c->next).func;
}
return 0;
}
-static naRef getLocal2(struct Context* ctx, struct Frame* f, naRef sym)
+static naRef getLocal2(naContext ctx, struct Frame* f, naRef sym)
{
naRef result;
if(!naHash_get(f->locals, sym, &result))
- if(!getClosure(f->func.ref.ptr.func, sym, &result))
- ERR(ctx, "undefined symbol");
+ if(!getClosure(PTR(f->func).func, sym, &result))
+ naRuntimeError(ctx, "undefined symbol: %s", naStr_data(sym));
return result;
}
-static void getLocal(struct Context* ctx, struct Frame* f,
- naRef* sym, naRef* out)
+static void getLocal(naContext ctx, struct Frame* f, naRef* sym, naRef* out)
{
struct naFunc* func;
- struct naStr* str = sym->ref.ptr.str;
- if(naHash_sym(f->locals.ref.ptr.hash, str, out))
+ struct naStr* str = PTR(*sym).str;
+ if(naiHash_sym(PTR(f->locals).hash, str, out))
return;
- func = f->func.ref.ptr.func;
- while(func && func->namespace.ref.ptr.hash) {
- if(naHash_sym(func->namespace.ref.ptr.hash, str, out))
+ func = PTR(f->func).func;
+ while(func && PTR(func->namespace).hash) {
+ if(naiHash_sym(PTR(func->namespace).hash, str, out))
return;
- func = func->next.ref.ptr.func;
+ func = PTR(func->next).func;
}
// Now do it again using the more general naHash_get(). This will
// only be necessary if something has created the value in the
static int setClosure(naRef func, naRef sym, naRef val)
{
- struct naFunc* c = func.ref.ptr.func;
- if(c == 0) { return 0; }
- else if(naHash_tryset(c->namespace, sym, val)) { return 1; }
- else { return setClosure(c->next, sym, val); }
+ struct naFunc* c = PTR(func).func;
+ if(c == 0) return 0;
+ if(naiHash_tryset(c->namespace, sym, val)) return 1;
+ return setClosure(c->next, sym, val);
}
-static naRef setSymbol(struct Frame* f, naRef sym, naRef val)
+static void setSymbol(struct Frame* f, naRef sym, naRef val)
{
// Try the locals first, if not already there try the closures in
// order. Finally put it in the locals if nothing matched.
- if(!naHash_tryset(f->locals, sym, val))
+ if(!naiHash_tryset(f->locals, sym, val))
if(!setClosure(f->func, sym, val))
naHash_set(f->locals, sym, val);
- return val;
}
-// Recursively descend into the parents lists
-static int getMember(struct Context* ctx, naRef obj, naRef fld,
- naRef* result, int count)
+// Funky API: returns null to indicate no member, an empty string to
+// indicate success, or a non-empty error message. Works this way so
+// we can generate smart error messages without throwing them with a
+// longjmp -- this gets called under naMember_get() from C code.
+static const char* getMember_r(naRef obj, naRef field, naRef* out, int count)
{
+ int i;
naRef p;
- if(--count < 0) ERR(ctx, "too many parents");
- if(!IS_HASH(obj)) ERR(ctx, "non-objects have no members");
- if(naHash_get(obj, fld, result)) {
- return 1;
- } else if(naHash_get(obj, globals->parentsRef, &p)) {
- if(IS_VEC(p)) {
- int i;
- struct VecRec* v = p.ref.ptr.vec->rec;
- for(i=0; i<v->size; i++)
- if(getMember(ctx, v->array[i], fld, result, count))
- return 1;
- } else
- ERR(ctx, "parents field not vector");
+ struct VecRec* pv;
+ if(--count < 0) return "too many parents";
+ if(!IS_HASH(obj)) return "non-objects have no members";
+ if(naHash_get(obj, field, out)) return "";
+ if(!naHash_get(obj, globals->parentsRef, &p)) return 0;
+ if(!IS_VEC(p)) return "object \"parents\" field not vector";
+ pv = PTR(p).vec->rec;
+ for(i=0; pv && i<pv->size; i++) {
+ const char* err = getMember_r(pv->array[i], field, out, count);
+ if(err) return err; /* either an error or success */
}
return 0;
}
+static void getMember(naContext ctx, naRef obj, naRef fld,
+ naRef* result, int count)
+{
+ const char* err = getMember_r(obj, fld, result, count);
+ if(!err) naRuntimeError(ctx, "No such member: %s", naStr_data(fld));
+ if(err[0]) naRuntimeError(ctx, err);
+}
+
+int naMember_get(naRef obj, naRef field, naRef* out)
+{
+ const char* err = getMember_r(obj, field, out, 64);
+ return err && !err[0];
+}
+
// OP_EACH works like a vector get, except that it leaves the vector
-// and index on the stack, increments the index after use, and pops
-// the arguments and pushes a nil if the index is beyond the end.
-static void evalEach(struct Context* ctx, int useIndex)
+// and index on the stack, increments the index after use, and
+// pushes a nil if the index is beyond the end.
+static void evalEach(naContext ctx, int useIndex)
{
int idx = (int)(ctx->opStack[ctx->opTop-1].num);
naRef vec = ctx->opStack[ctx->opTop-2];
- if(!IS_VEC(vec)) naRuntimeError(ctx, "foreach enumeration of non-vector");
- if(!vec.ref.ptr.vec->rec || idx >= vec.ref.ptr.vec->rec->size) {
- ctx->opTop -= 2; // pop two values
- PUSH(naNil());
+ if(!IS_VEC(vec)) ERR(ctx, "foreach enumeration of non-vector");
+ if(!PTR(vec).vec->rec || idx >= PTR(vec).vec->rec->size) {
+ PUSH(endToken());
return;
}
ctx->opStack[ctx->opTop-1].num = idx+1; // modify in place
PUSH(useIndex ? naNum(idx) : naVec_get(vec, idx));
}
-#define ARG() cd->byteCode[f->ip++]
+static void evalUnpack(naContext ctx, int count)
+{
+ naRef vec = ctx->opStack[--ctx->opTop];
+ if(!IS_VEC(vec) || naVec_size(vec) < count)
+ ERR(ctx, "short or invalid multi-assignment vector");
+ while(count--) PUSH(naVec_get(vec, count));
+}
+
+// FIXME: unify with almost identical checkVec() above
+static int vbound(naContext ctx, naRef v, naRef ir, int end)
+{
+ int sz=naVec_size(v), i = IS_NIL(ir) ? (end ? -1 : 0) : numify(ctx, ir);
+ if(IS_NIL(ir) && !sz) return i;
+ if(i < 0) i += sz;
+ if(i < 0 || i >= sz)
+ naRuntimeError(ctx, "slice index %d out of bounds (size: %d)",
+ i, sz);
+ return i;
+}
+
+static void evalSlice(naContext ctx, naRef src, naRef dst, naRef idx)
+{
+ if(!IS_VEC(src)) ERR(ctx, "cannot slice non-vector");
+ naVec_append(dst, naVec_get(src, checkVec(ctx, src, idx)));
+}
+
+static void evalSlice2(naContext ctx, naRef src, naRef dst,
+ naRef start, naRef endr)
+{
+ int i, end;
+ if(!IS_VEC(src)) ERR(ctx, "cannot slice non-vector");
+ end = vbound(ctx, src, endr, 1);
+ for(i = vbound(ctx, src, start, 0); i<=end; i++)
+ naVec_append(dst, naVec_get(src, i));
+}
+
+#define ARG() BYTECODE(cd)[f->ip++]
#define CONSTARG() cd->constants[ARG()]
#define POP() ctx->opStack[--ctx->opTop]
#define STK(n) (ctx->opStack[ctx->opTop-(n)])
-#define FIXFRAME() f = &(ctx->fStack[ctx->fTop-1]); \
- cd = f->func.ref.ptr.func->code.ref.ptr.code;
-static naRef run(struct Context* ctx)
+#define SETFRAME(F) f = (F); cd = PTR(PTR(f->func).func->code).code;
+#define FIXFRAME() SETFRAME(&(ctx->fStack[ctx->fTop-1]))
+static naRef run(naContext ctx)
{
struct Frame* f;
struct naCode* cd;
int op, arg;
- naRef a, b, c;
+ naRef a, b;
+
+ ctx->dieArg = naNil();
+ ctx->error[0] = 0;
FIXFRAME();
while(1) {
- op = cd->byteCode[f->ip++];
+ op = BYTECODE(cd)[f->ip++];
DBG(printf("Stack Depth: %d\n", ctx->opTop));
DBG(printOpDEBUG(f->ip-1, op));
switch(op) {
- case OP_POP:
- ctx->opTop--;
- break;
- case OP_DUP:
- PUSH(ctx->opStack[ctx->opTop-1]);
- break;
- case OP_DUP2:
- PUSH(ctx->opStack[ctx->opTop-2]);
- PUSH(ctx->opStack[ctx->opTop-2]);
- break;
- case OP_XCHG:
- a = STK(1); STK(1) = STK(2); STK(2) = a;
- break;
+ case OP_POP: ctx->opTop--; break;
+ case OP_DUP: PUSH(STK(1)); break;
+ case OP_DUP2: PUSH(STK(2)); PUSH(STK(2)); break;
+ case OP_XCHG: a=STK(1); STK(1)=STK(2); STK(2)=a; break;
+ case OP_XCHG2: a=STK(1); STK(1)=STK(2); STK(2)=STK(3); STK(3)=a; break;
#define BINOP(expr) do { \
double l = IS_NUM(STK(2)) ? STK(2).num : numify(ctx, STK(2)); \
double r = IS_NUM(STK(1)) ? STK(1).num : numify(ctx, STK(1)); \
- STK(2).ref.reftag = ~NASAL_REFTAG; \
- STK(2).num = expr; \
+ SETNUM(STK(2), expr); \
ctx->opTop--; } while(0)
case OP_PLUS: BINOP(l + r); break;
case OP_LTE: BINOP(l <= r ? 1 : 0); break;
case OP_GT: BINOP(l > r ? 1 : 0); break;
case OP_GTE: BINOP(l >= r ? 1 : 0); break;
-
#undef BINOP
case OP_EQ: case OP_NEQ:
STK(2) = evalEquality(op, STK(2), STK(1));
ctx->opTop--;
break;
- case OP_AND: case OP_OR:
- STK(2) = evalAndOr(ctx, op, STK(2), STK(1));
- ctx->opTop--;
- break;
case OP_CAT:
- // stringify can call the GC, so don't take stuff of the stack!
- a = stringify(ctx, ctx->opStack[ctx->opTop-1]);
- b = stringify(ctx, ctx->opStack[ctx->opTop-2]);
- c = naStr_concat(naNewString(ctx), b, a);
- ctx->opTop -= 2;
- PUSH(c);
+ STK(2) = evalCat(ctx, STK(2), STK(1));
+ ctx->opTop--;
break;
case OP_NEG:
STK(1) = naNum(-numify(ctx, STK(1)));
case OP_PUSHNIL:
PUSH(naNil());
break;
+ case OP_PUSHEND:
+ PUSH(endToken());
+ break;
case OP_NEWVEC:
PUSH(naNewVector(ctx));
break;
PUSH(b);
break;
case OP_SETSYM:
- STK(2) = setSymbol(f, STK(2), STK(1));
+ setSymbol(f, STK(1), STK(2));
ctx->opTop--;
break;
case OP_SETLOCAL:
- naHash_set(f->locals, STK(2), STK(1));
- STK(2) = STK(1); // FIXME: reverse order of arguments instead!
+ naHash_set(f->locals, STK(1), STK(2));
ctx->opTop--;
break;
case OP_MEMBER:
- if(!getMember(ctx, STK(1), CONSTARG(), &STK(1), 64))
- ERR(ctx, "no such member");
+ getMember(ctx, STK(1), CONSTARG(), &STK(1), 64);
break;
case OP_SETMEMBER:
- if(!IS_HASH(STK(3))) ERR(ctx, "non-objects have no members");
- naHash_set(STK(3), STK(2), STK(1));
- STK(3) = STK(1); // FIXME: fix arg order instead
+ if(!IS_HASH(STK(2))) ERR(ctx, "non-objects have no members");
+ naHash_set(STK(2), STK(1), STK(3));
ctx->opTop -= 2;
break;
case OP_INSERT:
- containerSet(ctx, STK(3), STK(2), STK(1));
- STK(3) = STK(1); // FIXME: codegen order again...
+ containerSet(ctx, STK(2), STK(1), STK(3));
ctx->opTop -= 2;
break;
case OP_EXTRACT:
STK(2) = containerGet(ctx, STK(2), STK(1));
ctx->opTop--;
break;
+ case OP_SLICE:
+ evalSlice(ctx, STK(3), STK(2), STK(1));
+ ctx->opTop--;
+ break;
+ case OP_SLICE2:
+ evalSlice2(ctx, STK(4), STK(3), STK(2), STK(1));
+ ctx->opTop -= 2;
+ break;
case OP_JMPLOOP:
// Identical to JMP, except for locking
naCheckBottleneck();
- f->ip = cd->byteCode[f->ip];
- DBG(printf(" [Jump to: %d]\n", f->ip);)
+ f->ip = BYTECODE(cd)[f->ip];
+ DBG(printf(" [Jump to: %d]\n", f->ip));
break;
case OP_JMP:
- f->ip = cd->byteCode[f->ip];
- DBG(printf(" [Jump to: %d]\n", f->ip);)
+ f->ip = BYTECODE(cd)[f->ip];
+ DBG(printf(" [Jump to: %d]\n", f->ip));
break;
- case OP_JIFNIL:
+ case OP_JIFEND:
arg = ARG();
- if(IS_NIL(STK(1))) {
+ if(IS_END(STK(1))) {
ctx->opTop--; // Pops **ONLY** if it's nil!
f->ip = arg;
- DBG(printf(" [Jump to: %d]\n", f->ip);)
+ DBG(printf(" [Jump to: %d]\n", f->ip));
}
break;
- case OP_JIFNOT:
+ case OP_JIFTRUE:
arg = ARG();
- if(!boolify(ctx, POP())) {
+ if(boolify(ctx, STK(1))) {
f->ip = arg;
- DBG(printf(" [Jump to: %d]\n", f->ip);)
+ DBG(printf(" [Jump to: %d]\n", f->ip));
}
break;
- case OP_FCALL:
- f = setupFuncall(ctx, ARG(), 0, 0);
- cd = f->func.ref.ptr.func->code.ref.ptr.code;
- break;
- case OP_FTAIL:
- f = setupFuncall(ctx, ARG(), 0, 1);
- cd = f->func.ref.ptr.func->code.ref.ptr.code;
- break;
- case OP_MCALL:
- f = setupFuncall(ctx, ARG(), 1, 0);
- cd = f->func.ref.ptr.func->code.ref.ptr.code;
+ case OP_JIFNOT:
+ arg = ARG();
+ if(!boolify(ctx, STK(1))) {
+ f->ip = arg;
+ DBG(printf(" [Jump to: %d]\n", f->ip));
+ }
break;
- case OP_MTAIL:
- f = setupFuncall(ctx, ARG(), 1, 1);
- cd = f->func.ref.ptr.func->code.ref.ptr.code;
+ case OP_JIFNOTPOP:
+ arg = ARG();
+ if(!boolify(ctx, POP())) {
+ f->ip = arg;
+ DBG(printf(" [Jump to: %d]\n", f->ip));
+ }
break;
+ case OP_FCALL: SETFRAME(setupFuncall(ctx, ARG(), 0, 0)); break;
+ case OP_MCALL: SETFRAME(setupFuncall(ctx, ARG(), 1, 0)); break;
+ case OP_FCALLH: SETFRAME(setupFuncall(ctx, 1, 0, 1)); break;
+ case OP_MCALLH: SETFRAME(setupFuncall(ctx, 1, 1, 1)); break;
case OP_RETURN:
a = STK(1);
+ ctx->dieArg = naNil();
+ if(ctx->callChild) naFreeContext(ctx->callChild);
if(--ctx->fTop <= 0) return a;
ctx->opTop = f->bp + 1; // restore the correct opstack frame!
STK(1) = a;
break;
case OP_MARK: // save stack state (e.g. "setjmp")
if(ctx->markTop >= MAX_MARK_DEPTH)
- naRuntimeError(ctx, "mark stack overflow");
+ ERR(ctx, "mark stack overflow");
ctx->markStack[ctx->markTop++] = ctx->opTop;
break;
case OP_UNMARK: // pop stack state set by mark
ctx->markTop--;
break;
case OP_BREAK: // restore stack state (FOLLOW WITH JMP!)
+ ctx->opTop = ctx->markStack[ctx->markTop-1];
+ break;
+ case OP_BREAK2: // same, but also pop the mark stack
ctx->opTop = ctx->markStack[--ctx->markTop];
break;
+ case OP_UNPACK:
+ evalUnpack(ctx, ARG());
+ break;
default:
ERR(ctx, "BUG: bad opcode");
}
ctx->ntemps = 0; // reset GC temp vector
- DBG(printStackDEBUG(ctx);)
+ DBG(printStackDEBUG(ctx));
}
return naNil(); // unreachable
}
#undef STK
#undef FIXFRAME
-void naSave(struct Context* ctx, naRef obj)
+void naSave(naContext ctx, naRef obj)
{
naVec_append(globals->save, obj);
}
-// FIXME: handle ctx->callParent
-int naStackDepth(struct Context* ctx)
+int naStackDepth(naContext ctx)
{
- return ctx->fTop;
+ return ctx ? ctx->fTop + naStackDepth(ctx->callChild): 0;
}
-// FIXME: handle ctx->callParent
-int naGetLine(struct Context* ctx, int frame)
+static int findFrame(naContext ctx, naContext* out, int fn)
{
- struct Frame* f = &ctx->fStack[ctx->fTop-1-frame];
- naRef func = f->func;
- int ip = f->ip;
- if(IS_FUNC(func) && IS_CODE(func.ref.ptr.func->code)) {
- struct naCode* c = func.ref.ptr.func->code.ref.ptr.code;
- unsigned short* p = c->lineIps + c->nLines - 2;
- while(p >= c->lineIps && p[0] > ip)
+ int sd = naStackDepth(ctx->callChild);
+ if(fn < sd) return findFrame(ctx->callChild, out, fn);
+ *out = ctx;
+ return ctx->fTop - 1 - (fn - sd);
+}
+
+int naGetLine(naContext ctx, int frame)
+{
+ struct Frame* f;
+ frame = findFrame(ctx, &ctx, frame);
+ f = &ctx->fStack[frame];
+ if(IS_FUNC(f->func) && IS_CODE(PTR(f->func).func->code)) {
+ struct naCode* c = PTR(PTR(f->func).func->code).code;
+ unsigned short* p = LINEIPS(c) + c->nLines - 2;
+ while(p >= LINEIPS(c) && p[0] > f->ip)
p -= 2;
return p[1];
}
return -1;
}
-// FIXME: handle ctx->callParent
-naRef naGetSourceFile(struct Context* ctx, int frame)
+naRef naGetSourceFile(naContext ctx, int frame)
{
- naRef f = ctx->fStack[ctx->fTop-1-frame].func;
- f = f.ref.ptr.func->code;
- return f.ref.ptr.code->srcFile;
+ naRef f;
+ frame = findFrame(ctx, &ctx, frame);
+ f = ctx->fStack[frame].func;
+ f = PTR(f).func->code;
+ return PTR(f).code->srcFile;
}
-char* naGetError(struct Context* ctx)
+char* naGetError(naContext ctx)
{
if(IS_STR(ctx->dieArg))
- return (char*)ctx->dieArg.ref.ptr.str->data;
- return ctx->error;
+ return naStr_data(ctx->dieArg);
+ return ctx->error[0] ? ctx->error : 0;
}
naRef naBindFunction(naContext ctx, naRef code, naRef closure)
{
naRef func = naNewFunc(ctx, code);
- func.ref.ptr.func->namespace = closure;
- func.ref.ptr.func->next = naNil();
+ PTR(func).func->namespace = closure;
+ PTR(func).func->next = naNil();
return func;
}
naRef naBindToContext(naContext ctx, naRef code)
{
naRef func = naNewFunc(ctx, code);
- struct Frame* f = &ctx->fStack[ctx->fTop-1];
- func.ref.ptr.func->namespace = f->locals;
- func.ref.ptr.func->next = f->func;
+ if(ctx->fTop) {
+ struct Frame* f = &ctx->fStack[ctx->fTop-1];
+ PTR(func).func->namespace = f->locals;
+ PTR(func).func->next = f->func;
+ }
return func;
}
{
int i;
naRef result;
- if(!ctx->callParent) naModLock(ctx);
+ if(!ctx->callParent) naModLock();
// We might have to allocate objects, which can call the GC. But
// the call isn't on the Nasal stack yet, so the GC won't find our
naTempSave(ctx, obj);
naTempSave(ctx, locals);
- if(IS_CCODE(func.ref.ptr.func->code)) {
- naCFunction fp = func.ref.ptr.func->code.ref.ptr.ccode->fptr;
+ // naRuntimeError() calls end up here:
+ if(setjmp(ctx->jumpHandle)) {
+ if(!ctx->callParent) naModUnlock();
+ return naNil();
+ }
+
+ if(IS_CCODE(PTR(func).func->code)) {
+ naCFunction fp = PTR(PTR(func).func->code).ccode->fptr;
result = (*fp)(ctx, obj, argc, args);
- if(!ctx->callParent) naModUnlock(ctx);
+ if(!ctx->callParent) naModUnlock();
return result;
}
if(IS_NIL(locals))
locals = naNewHash(ctx);
- if(!IS_FUNC(func))
- func = naNewFunc(ctx, func); // bind bare code objects
+ if(!IS_FUNC(func)) {
+ func = naNewFunc(ctx, func);
+ PTR(func).func->namespace = locals;
+ }
if(!IS_NIL(obj))
naHash_set(locals, globals->meRef, obj);
- ctx->dieArg = naNil();
-
ctx->opTop = ctx->markTop = 0;
ctx->fTop = 1;
ctx->fStack[0].func = func;
+
ctx->fStack[0].locals = locals;
ctx->fStack[0].ip = 0;
ctx->fStack[0].bp = ctx->opTop;
setupArgs(ctx, ctx->fStack, args, argc);
- // Return early if an error occurred. It will be visible to the
- // caller via naGetError().
- ctx->error = 0;
+ result = run(ctx);
+ if(!ctx->callParent) naModUnlock();
+ return result;
+}
+
+naRef naContinue(naContext ctx)
+{
+ naRef result;
+ if(!ctx->callParent) naModLock();
+
+ ctx->dieArg = naNil();
+ ctx->error[0] = 0;
+
if(setjmp(ctx->jumpHandle)) {
- if(!ctx->callParent) naModUnlock(ctx);
+ if(!ctx->callParent) naModUnlock();
+ else naRethrowError(ctx);
return naNil();
}
+ // Wipe off the old function arguments, and push the expected
+ // result (either the result of our subcontext, or a synthesized
+ // nil if the thrown error was from an extension function or
+ // in-script die() call) before re-running the code from the
+ // instruction following the error.
+ ctx->opTop = ctx->opFrame;
+ PUSH(ctx->callChild ? naContinue(ctx->callChild) : naNil());
+
+ // Getting here means the child completed successfully. But
+ // because its original C stack was longjmp'd out of existence,
+ // there is no one left to free the context, so we have to do it.
+ // This is fragile, but unfortunately required.
+ if(ctx->callChild) naFreeContext(ctx->callChild);
+
result = run(ctx);
- if(!ctx->callParent) naModUnlock(ctx);
+ if(!ctx->callParent) naModUnlock();
return result;
}
-
projects / simgear.git / blobdiff