1 files changed, 1436 insertions, 0 deletions
diff --git a/src/ceval.c b/src/ceval.c
new file mode 100644
index 0000000..6876208
--- /dev/null
+++ b/src/ceval.c
@@ -0,0 +1,1436 @@
+/***********************************************************
+Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The
+Netherlands.
+
+ All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the names of Stichting Mathematisch
+Centrum or CWI not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior permission.
+
+STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
+THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
+FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+******************************************************************/
+
+/* Execute compiled code */
+
+#include "allobjects.h"
+
+#include "import.h"
+#include "sysmodule.h"
+#include "compile.h"
+#include "frameobject.h"
+#include "ceval.h"
+#include "opcode.h"
+#include "bltinmodule.h"
+#include "traceback.h"
+
+#ifndef NDEBUG
+#define TRACE
+#endif
+
+#ifdef TRACE
+static int
+prtrace(v, str)
+ object *v;
+ char *str;
+{
+ printf("%s ", str);
+ printobject(v, stdout, 0);
+ printf("\n");
+}
+#endif
+
+static frameobject *current_frame;
+
+object *
+getlocals()
+{
+ if (current_frame == NULL)
+ return NULL;
+ else
+ return current_frame->f_locals;
+}
+
+object *
+getglobals()
+{
+ if (current_frame == NULL)
+ return NULL;
+ else
+ return current_frame->f_globals;
+}
+
+void
+printtraceback(fp)
+ FILE *fp;
+{
+ object *v = tb_fetch();
+ if (v != NULL) {
+ fprintf(fp, "Stack backtrace (innermost last):\n");
+ tb_print(v, fp);
+ DECREF(v);
+ }
+}
+
+
+/* XXX Mixing "print ...," and direct file I/O on stdin/stdout
+ XXX has some bad consequences. The needspace flag should
+ XXX really be part of the file object. */
+
+static int needspace;
+
+void
+flushline()
+{
+ FILE *fp = sysgetfile("stdout", stdout);
+ if (needspace) {
+ fprintf(fp, "\n");
+ needspace = 0;
+ }
+}
+
+
+/* Test a value used as condition, e.g., in a for or if statement */
+
+static int
+testbool(v)
+ object *v;
+{
+ if (is_intobject(v))
+ return getintvalue(v) != 0;
+ if (is_floatobject(v))
+ return getfloatvalue(v) != 0.0;
+ if (v->ob_type->tp_as_sequence != NULL)
+ return (*v->ob_type->tp_as_sequence->sq_length)(v) != 0;
+ if (v->ob_type->tp_as_mapping != NULL)
+ return (*v->ob_type->tp_as_mapping->mp_length)(v) != 0;
+ if (v == None)
+ return 0;
+ /* All other objects are 'true' */
+ return 1;
+}
+
+static object *
+add(v, w)
+ object *v, *w;
+{
+ if (v->ob_type->tp_as_number != NULL)
+ v = (*v->ob_type->tp_as_number->nb_add)(v, w);
+ else if (v->ob_type->tp_as_sequence != NULL)
+ v = (*v->ob_type->tp_as_sequence->sq_concat)(v, w);
+ else {
+ err_setstr(TypeError, "+ not supported by operands");
+ return NULL;
+ }
+ return v;
+}
+
+static object *
+sub(v, w)
+ object *v, *w;
+{
+ if (v->ob_type->tp_as_number != NULL)
+ return (*v->ob_type->tp_as_number->nb_subtract)(v, w);
+ err_setstr(TypeError, "bad operand type(s) for -");
+ return NULL;
+}
+
+static object *
+mul(v, w)
+ object *v, *w;
+{
+ typeobject *tp;
+ if (is_intobject(v) && w->ob_type->tp_as_sequence != NULL) {
+ /* int*sequence -- swap v and w */
+ object *tmp = v;
+ v = w;
+ w = tmp;
+ }
+ tp = v->ob_type;
+ if (tp->tp_as_number != NULL)
+ return (*tp->tp_as_number->nb_multiply)(v, w);
+ if (tp->tp_as_sequence != NULL) {
+ if (!is_intobject(w)) {
+ err_setstr(TypeError,
+ "can't multiply sequence with non-int");
+ return NULL;
+ }
+ if (tp->tp_as_sequence->sq_repeat == NULL) {
+ err_setstr(TypeError, "sequence does not support *");
+ return NULL;
+ }
+ return (*tp->tp_as_sequence->sq_repeat)
+ (v, (int)getintvalue(w));
+ }
+ err_setstr(TypeError, "bad operand type(s) for *");
+ return NULL;
+}
+
+static object *
+divide(v, w)
+ object *v, *w;
+{
+ if (v->ob_type->tp_as_number != NULL)
+ return (*v->ob_type->tp_as_number->nb_divide)(v, w);
+ err_setstr(TypeError, "bad operand type(s) for /");
+ return NULL;
+}
+
+static object *
+rem(v, w)
+ object *v, *w;
+{
+ if (v->ob_type->tp_as_number != NULL)
+ return (*v->ob_type->tp_as_number->nb_remainder)(v, w);
+ err_setstr(TypeError, "bad operand type(s) for %");
+ return NULL;
+}
+
+static object *
+neg(v)
+ object *v;
+{
+ if (v->ob_type->tp_as_number != NULL)
+ return (*v->ob_type->tp_as_number->nb_negative)(v);
+ err_setstr(TypeError, "bad operand type(s) for unary -");
+ return NULL;
+}
+
+static object *
+pos(v)
+ object *v;
+{
+ if (v->ob_type->tp_as_number != NULL)
+ return (*v->ob_type->tp_as_number->nb_positive)(v);
+ err_setstr(TypeError, "bad operand type(s) for unary +");
+ return NULL;
+}
+
+static object *
+not(v)
+ object *v;
+{
+ int outcome = testbool(v);
+ object *w = outcome == 0 ? True : False;
+ INCREF(w);
+ return w;
+}
+
+static object *
+call_builtin(func, arg)
+ object *func;
+ object *arg;
+{
+ if (is_methodobject(func)) {
+ method meth = getmethod(func);
+ object *self = getself(func);
+ return (*meth)(self, arg);
+ }
+ if (is_classobject(func)) {
+ if (arg != NULL) {
+ err_setstr(TypeError,
+ "classobject() allows no arguments");
+ return NULL;
+ }
+ return newclassmemberobject(func);
+ }
+ err_setstr(TypeError, "call of non-function");
+ return NULL;
+}
+
+static object *
+call_function(func, arg)
+ object *func;
+ object *arg;
+{
+ object *newarg = NULL;
+ object *newlocals, *newglobals;
+ object *co, *v;
+
+ if (is_classmethodobject(func)) {
+ object *self = classmethodgetself(func);
+ func = classmethodgetfunc(func);
+ if (arg == NULL) {
+ arg = self;
+ }
+ else {
+ newarg = newtupleobject(2);
+ if (newarg == NULL)
+ return NULL;
+ INCREF(self);
+ INCREF(arg);
+ settupleitem(newarg, 0, self);
+ settupleitem(newarg, 1, arg);
+ arg = newarg;
+ }
+ }
+ else {
+ if (!is_funcobject(func)) {
+ err_setstr(TypeError, "call of non-function");
+ return NULL;
+ }
+ }
+
+ co = getfunccode(func);
+ if (co == NULL) {
+ XDECREF(newarg);
+ return NULL;
+ }
+ if (!is_codeobject(co)) {
+ fprintf(stderr, "XXX Bad code\n");
+ abort();
+ }
+ newlocals = newdictobject();
+ if (newlocals == NULL) {
+ XDECREF(newarg);
+ return NULL;
+ }
+
+ newglobals = getfuncglobals(func);
+ INCREF(newglobals);
+
+ v = eval_code((codeobject *)co, newglobals, newlocals, arg);
+
+ DECREF(newlocals);
+ DECREF(newglobals);
+
+ XDECREF(newarg);
+
+ return v;
+}
+
+static object *
+apply_subscript(v, w)
+ object *v, *w;
+{
+ typeobject *tp = v->ob_type;
+ if (tp->tp_as_sequence == NULL && tp->tp_as_mapping == NULL) {
+ err_setstr(TypeError, "unsubscriptable object");
+ return NULL;
+ }
+ if (tp->tp_as_sequence != NULL) {
+ int i;
+ if (!is_intobject(w)) {
+ err_setstr(TypeError, "sequence subscript not int");
+ return NULL;
+ }
+ i = getintvalue(w);
+ return (*tp->tp_as_sequence->sq_item)(v, i);
+ }
+ return (*tp->tp_as_mapping->mp_subscript)(v, w);
+}
+
+static object *
+loop_subscript(v, w)
+ object *v, *w;
+{
+ sequence_methods *sq = v->ob_type->tp_as_sequence;
+ int i, n;
+ if (sq == NULL) {
+ err_setstr(TypeError, "loop over non-sequence");
+ return NULL;
+ }
+ i = getintvalue(w);
+ n = (*sq->sq_length)(v);
+ if (i >= n)
+ return NULL; /* End of loop */
+ return (*sq->sq_item)(v, i);
+}
+
+static int
+slice_index(v, isize, pi)
+ object *v;
+ int isize;
+ int *pi;
+{
+ if (v != NULL) {
+ if (!is_intobject(v)) {
+ err_setstr(TypeError, "slice index must be int");
+ return -1;
+ }
+ *pi = getintvalue(v);
+ if (*pi < 0)
+ *pi += isize;
+ }
+ return 0;
+}
+
+static object *
+apply_slice(u, v, w) /* return u[v:w] */
+ object *u, *v, *w;
+{
+ typeobject *tp = u->ob_type;
+ int ilow, ihigh, isize;
+ if (tp->tp_as_sequence == NULL) {
+ err_setstr(TypeError, "only sequences can be sliced");
+ return NULL;
+ }
+ ilow = 0;
+ isize = ihigh = (*tp->tp_as_sequence->sq_length)(u);
+ if (slice_index(v, isize, &ilow) != 0)
+ return NULL;
+ if (slice_index(w, isize, &ihigh) != 0)
+ return NULL;
+ return (*tp->tp_as_sequence->sq_slice)(u, ilow, ihigh);
+}
+
+static int
+assign_subscript(w, key, v) /* w[key] = v */
+ object *w;
+ object *key;
+ object *v;
+{
+ typeobject *tp = w->ob_type;
+ sequence_methods *sq;
+ mapping_methods *mp;
+ int (*func)();
+ if ((sq = tp->tp_as_sequence) != NULL &&
+ (func = sq->sq_ass_item) != NULL) {
+ if (!is_intobject(key)) {
+ err_setstr(TypeError,
+ "sequence subscript must be integer");
+ return -1;
+ }
+ else
+ return (*func)(w, (int)getintvalue(key), v);
+ }
+ else if ((mp = tp->tp_as_mapping) != NULL &&
+ (func = mp->mp_ass_subscript) != NULL) {
+ return (*func)(w, key, v);
+ }
+ else {
+ err_setstr(TypeError,
+ "can't assign to this subscripted object");
+ return -1;
+ }
+}
+
+static int
+assign_slice(u, v, w, x) /* u[v:w] = x */
+ object *u, *v, *w, *x;
+{
+ sequence_methods *sq = u->ob_type->tp_as_sequence;
+ int ilow, ihigh, isize;
+ if (sq == NULL) {
+ err_setstr(TypeError, "assign to slice of non-sequence");
+ return -1;
+ }
+ if (sq == NULL || sq->sq_ass_slice == NULL) {
+ err_setstr(TypeError, "unassignable slice");
+ return -1;
+ }
+ ilow = 0;
+ isize = ihigh = (*sq->sq_length)(u);
+ if (slice_index(v, isize, &ilow) != 0)
+ return -1;
+ if (slice_index(w, isize, &ihigh) != 0)
+ return -1;
+ return (*sq->sq_ass_slice)(u, ilow, ihigh, x);
+}
+
+static int
+cmp_exception(err, v)
+ object *err, *v;
+{
+ if (is_tupleobject(v)) {
+ int i, n;
+ n = gettuplesize(v);
+ for (i = 0; i < n; i++) {
+ if (err == gettupleitem(v, i))
+ return 1;
+ }
+ return 0;
+ }
+ return err == v;
+}
+
+static int
+cmp_member(v, w)
+ object *v, *w;
+{
+ int i, n, cmp;
+ object *x;
+ sequence_methods *sq;
+ /* Special case for char in string */
+ if (is_stringobject(w)) {
+ register char *s, *end;
+ register char c;
+ if (!is_stringobject(v) || getstringsize(v) != 1) {
+ err_setstr(TypeError,
+ "string member test needs char left operand");
+ return -1;
+ }
+ c = getstringvalue(v)[0];
+ s = getstringvalue(w);
+ end = s + getstringsize(w);
+ while (s < end) {
+ if (c == *s++)
+ return 1;
+ }
+ return 0;
+ }
+ sq = w->ob_type->tp_as_sequence;
+ if (sq == NULL) {
+ err_setstr(TypeError,
+ "'in' or 'not in' needs sequence right argument");
+ return -1;
+ }
+ n = (*sq->sq_length)(w);
+ for (i = 0; i < n; i++) {
+ x = (*sq->sq_item)(w, i);
+ cmp = cmpobject(v, x);
+ XDECREF(x);
+ if (cmp == 0)
+ return 1;
+ }
+ return 0;
+}
+
+static object *
+cmp_outcome(op, v, w)
+ enum cmp_op op;
+ register object *v;
+ register object *w;
+{
+ register int cmp;
+ register int res = 0;
+ switch (op) {
+ case IS:
+ case IS_NOT:
+ res = (v == w);
+ if (op == IS_NOT)
+ res = !res;
+ break;
+ case IN:
+ case NOT_IN:
+ res = cmp_member(v, w);
+ if (res < 0)
+ return NULL;
+ if (op == NOT_IN)
+ res = !res;
+ break;
+ case EXC_MATCH:
+ res = cmp_exception(v, w);
+ break;
+ default:
+ cmp = cmpobject(v, w);
+ switch (op) {
+ case LT: res = cmp < 0; break;
+ case LE: res = cmp <= 0; break;
+ case EQ: res = cmp == 0; break;
+ case NE: res = cmp != 0; break;
+ case GT: res = cmp > 0; break;
+ case GE: res = cmp >= 0; break;
+ /* XXX no default? (res is initialized to 0 though) */
+ }
+ }
+ v = res ? True : False;
+ INCREF(v);
+ return v;
+}
+
+static int
+import_from(locals, v, name)
+ object *locals;
+ object *v;
+ char *name;
+{
+ object *w, *x;
+ w = getmoduledict(v);
+ if (name[0] == '*') {
+ int i;
+ int n = getdictsize(w);
+ for (i = 0; i < n; i++) {
+ name = getdictkey(w, i);
+ if (name == NULL || name[0] == '_')
+ continue;
+ x = dictlookup(w, name);
+ if (x == NULL) {
+ /* XXX can't happen? */
+ err_setstr(NameError, name);
+ return -1;
+ }
+ if (dictinsert(locals, name, x) != 0)
+ return -1;
+ }
+ return 0;
+ }
+ else {
+ x = dictlookup(w, name);
+ if (x == NULL) {
+ err_setstr(NameError, name);
+ return -1;
+ }
+ else
+ return dictinsert(locals, name, x);
+ }
+}
+
+static object *
+build_class(v, w)
+ object *v; /* None or tuple containing base classes */
+ object *w; /* dictionary */
+{
+ if (is_tupleobject(v)) {
+ int i;
+ for (i = gettuplesize(v); --i >= 0; ) {
+ object *x = gettupleitem(v, i);
+ if (!is_classobject(x)) {
+ err_setstr(TypeError,
+ "base is not a class object");
+ return NULL;
+ }
+ }
+ }
+ else {
+ v = NULL;
+ }
+ if (!is_dictobject(w)) {
+ err_setstr(SystemError, "build_class with non-dictionary");
+ return NULL;
+ }
+ return newclassobject(v, w);
+}
+
+
+/* Status code for main loop (reason for stack unwind) */
+
+enum why_code {
+ WHY_NOT, /* No error */
+ WHY_EXCEPTION, /* Exception occurred */
+ WHY_RERAISE, /* Exception re-raised by 'finally' */
+ WHY_RETURN, /* 'return' statement */
+ WHY_BREAK /* 'break' statement */
+};
+
+/* Interpreter main loop */
+
+object *
+eval_code(co, globals, locals, arg)
+ codeobject *co;
+ object *globals;
+ object *locals;
+ object *arg;
+{
+ register unsigned char *next_instr;
+ register int opcode; /* Current opcode */
+ register int oparg; /* Current opcode argument, if any */
+ register object **stack_pointer;
+ register enum why_code why; /* Reason for block stack unwind */
+ register int err; /* Error status -- nonzero if error */
+ register object *x; /* Result object -- NULL if error */
+ register object *v; /* Temporary objects popped off stack */
+ register object *w;
+ register object *u;
+ register object *t;
+ register frameobject *f; /* Current frame */
+ int lineno; /* Current line number */
+ object *retval; /* Return value iff why == WHY_RETURN */
+ char *name; /* Name used by some instructions */
+ FILE *fp; /* Used by print operations */
+#ifdef TRACE
+ int trace = dictlookup(globals, "__trace__") != NULL;
+#endif
+
+/* Code access macros */
+
+#define GETCONST(i) Getconst(f, i)
+#define GETNAME(i) Getname(f, i)
+#define FIRST_INSTR() (GETUSTRINGVALUE(f->f_code->co_code))
+#define INSTR_OFFSET() (next_instr - FIRST_INSTR())
+#define NEXTOP() (*next_instr++)
+#define NEXTARG() (next_instr += 2, (next_instr[-1]<<8) + next_instr[-2])
+#define JUMPTO(x) (next_instr = FIRST_INSTR() + (x))
+#define JUMPBY(x) (next_instr += (x))
+
+/* Stack manipulation macros */
+
+#define STACK_LEVEL() (stack_pointer - f->f_valuestack)
+#define EMPTY() (STACK_LEVEL() == 0)
+#define TOP() (stack_pointer[-1])
+#define BASIC_PUSH(v) (*stack_pointer++ = (v))
+#define BASIC_POP() (*--stack_pointer)
+
+#ifdef TRACE
+#define PUSH(v) (BASIC_PUSH(v), trace && prtrace(TOP(), "push"))
+#define POP() (trace && prtrace(TOP(), "pop"), BASIC_POP())
+#else
+#define PUSH(v) BASIC_PUSH(v)
+#define POP() BASIC_POP()
+#endif
+
+ f = newframeobject(
+ current_frame, /*back*/
+ co, /*code*/
+ globals, /*globals*/
+ locals, /*locals*/
+ 50, /*nvalues*/
+ 20); /*nblocks*/
+ if (f == NULL)
+ return NULL;
+
+ current_frame = f;
+
+ next_instr = GETUSTRINGVALUE(f->f_code->co_code);
+
+ stack_pointer = f->f_valuestack;
+
+ if (arg != NULL) {
+ INCREF(arg);
+ PUSH(arg);
+ }
+
+ why = WHY_NOT;
+ err = 0;
+ x = None; /* Not a reference, just anything non-NULL */
+ lineno = -1;
+
+ for (;;) {
+ static ticker;
+
+ /* Do periodic things */
+
+ if (--ticker < 0) {
+ ticker = 100;
+ if (intrcheck()) {
+ err_set(KeyboardInterrupt);
+ why = WHY_EXCEPTION;
+ tb_here(f, INSTR_OFFSET(), lineno);
+ break;
+ }
+ }
+
+ /* Extract opcode and argument */
+
+ opcode = NEXTOP();
+ if (HAS_ARG(opcode))
+ oparg = NEXTARG();
+
+#ifdef TRACE
+ /* Instruction tracing */
+
+ if (trace) {
+ if (HAS_ARG(opcode)) {
+ printf("%d: %d, %d\n",
+ (int) (INSTR_OFFSET() - 3),
+ opcode, oparg);
+ }
+ else {
+ printf("%d: %d\n",
+ (int) (INSTR_OFFSET() - 1), opcode);
+ }
+ }
+#endif
+
+ /* Main switch on opcode */
+
+ switch (opcode) {
+
+ /* BEWARE!
+ It is essential that any operation that fails sets either
+ x to NULL, err to nonzero, or why to anything but WHY_NOT,
+ and that no operation that succeeds does this! */
+
+ /* case STOP_CODE: this is an error! */
+
+ case POP_TOP:
+ v = POP();
+ DECREF(v);
+ break;
+
+ case ROT_TWO:
+ v = POP();
+ w = POP();
+ PUSH(v);
+ PUSH(w);
+ break;
+
+ case ROT_THREE:
+ v = POP();
+ w = POP();
+ x = POP();
+ PUSH(v);
+ PUSH(x);
+ PUSH(w);
+ break;
+
+ case DUP_TOP:
+ v = TOP();
+ INCREF(v);
+ PUSH(v);
+ break;
+
+ case UNARY_POSITIVE:
+ v = POP();
+ x = pos(v);
+ DECREF(v);
+ PUSH(x);
+ break;
+
+ case UNARY_NEGATIVE:
+ v = POP();
+ x = neg(v);
+ DECREF(v);
+ PUSH(x);
+ break;
+
+ case UNARY_NOT:
+ v = POP();
+ x = not(v);
+ DECREF(v);
+ PUSH(x);
+ break;
+
+ case UNARY_CONVERT:
+ v = POP();
+ x = reprobject(v);
+ DECREF(v);
+ PUSH(x);
+ break;
+
+ case UNARY_CALL:
+ v = POP();
+ if (is_classmethodobject(v) || is_funcobject(v))
+ x = call_function(v, (object *)NULL);
+ else
+ x = call_builtin(v, (object *)NULL);
+ DECREF(v);
+ PUSH(x);
+ break;
+
+ case BINARY_MULTIPLY:
+ w = POP();
+ v = POP();
+ x = mul(v, w);
+ DECREF(v);
+ DECREF(w);
+ PUSH(x);
+ break;
+
+ case BINARY_DIVIDE:
+ w = POP();
+ v = POP();
+ x = divide(v, w);
+ DECREF(v);
+ DECREF(w);
+ PUSH(x);
+ break;
+
+ case BINARY_MODULO:
+ w = POP();
+ v = POP();
+ x = rem(v, w);
+ DECREF(v);
+ DECREF(w);
+ PUSH(x);
+ break;
+
+ case BINARY_ADD:
+ w = POP();
+ v = POP();
+ x = add(v, w);
+ DECREF(v);
+ DECREF(w);
+ PUSH(x);
+ break;
+
+ case BINARY_SUBTRACT:
+ w = POP();
+ v = POP();
+ x = sub(v, w);
+ DECREF(v);
+ DECREF(w);
+ PUSH(x);
+ break;
+
+ case BINARY_SUBSCR:
+ w = POP();
+ v = POP();
+ x = apply_subscript(v, w);
+ DECREF(v);
+ DECREF(w);
+ PUSH(x);
+ break;
+
+ case BINARY_CALL:
+ w = POP();
+ v = POP();
+ if (is_classmethodobject(v) || is_funcobject(v))
+ x = call_function(v, w);
+ else
+ x = call_builtin(v, w);
+ DECREF(v);
+ DECREF(w);
+ PUSH(x);
+ break;
+
+ case SLICE+0:
+ case SLICE+1:
+ case SLICE+2:
+ case SLICE+3:
+ if ((opcode-SLICE) & 2)
+ w = POP();
+ else
+ w = NULL;
+ if ((opcode-SLICE) & 1)
+ v = POP();
+ else
+ v = NULL;
+ u = POP();
+ x = apply_slice(u, v, w);
+ DECREF(u);
+ XDECREF(v);
+ XDECREF(w);
+ PUSH(x);
+ break;
+
+ case STORE_SLICE+0:
+ case STORE_SLICE+1:
+ case STORE_SLICE+2:
+ case STORE_SLICE+3:
+ if ((opcode-STORE_SLICE) & 2)
+ w = POP();
+ else
+ w = NULL;
+ if ((opcode-STORE_SLICE) & 1)
+ v = POP();
+ else
+ v = NULL;
+ u = POP();
+ t = POP();
+ err = assign_slice(u, v, w, t); /* u[v:w] = t */
+ DECREF(t);
+ DECREF(u);
+ XDECREF(v);
+ XDECREF(w);
+ break;
+
+ case DELETE_SLICE+0:
+ case DELETE_SLICE+1:
+ case DELETE_SLICE+2:
+ case DELETE_SLICE+3:
+ if ((opcode-DELETE_SLICE) & 2)
+ w = POP();
+ else
+ w = NULL;
+ if ((opcode-DELETE_SLICE) & 1)
+ v = POP();
+ else
+ v = NULL;
+ u = POP();
+ err = assign_slice(u, v, w, (object *)NULL);
+ /* del u[v:w] */
+ DECREF(u);
+ XDECREF(v);
+ XDECREF(w);
+ break;
+
+ case STORE_SUBSCR:
+ w = POP();
+ v = POP();
+ u = POP();
+ /* v[w] = u */
+ err = assign_subscript(v, w, u);
+ DECREF(u);
+ DECREF(v);
+ DECREF(w);
+ break;
+
+ case DELETE_SUBSCR:
+ w = POP();
+ v = POP();
+ /* del v[w] */
+ err = assign_subscript(v, w, (object *)NULL);
+ DECREF(v);
+ DECREF(w);
+ break;
+
+ case PRINT_EXPR:
+ v = POP();
+ fp = sysgetfile("stdout", stdout);
+ /* Print value except if procedure result */
+ if (v != None) {
+ flushline();
+ printobject(v, fp, 0);
+ fprintf(fp, "\n");
+ }
+ DECREF(v);
+ break;
+
+ case PRINT_ITEM:
+ v = POP();
+ fp = sysgetfile("stdout", stdout);
+ if (needspace)
+ fprintf(fp, " ");
+ if (is_stringobject(v)) {
+ char *s = getstringvalue(v);
+ int len = getstringsize(v);
+ fwrite(s, 1, len, fp);
+ if (len > 0 && s[len-1] == '\n')
+ needspace = 0;
+ else
+ needspace = 1;
+ }
+ else {
+ printobject(v, fp, 0);
+ needspace = 1;
+ }
+ DECREF(v);
+ break;
+
+ case PRINT_NEWLINE:
+ fp = sysgetfile("stdout", stdout);
+ fprintf(fp, "\n");
+ needspace = 0;
+ break;
+
+ case BREAK_LOOP:
+ why = WHY_BREAK;
+ break;
+
+ case RAISE_EXCEPTION:
+ v = POP();
+ w = POP();
+ if (!is_stringobject(w))
+ err_setstr(TypeError,
+ "exceptions must be strings");
+ else
+ err_setval(w, v);
+ DECREF(v);
+ DECREF(w);
+ why = WHY_EXCEPTION;
+ break;
+
+ case LOAD_LOCALS:
+ v = f->f_locals;
+ INCREF(v);
+ PUSH(v);
+ break;
+
+ case RETURN_VALUE:
+ retval = POP();
+ why = WHY_RETURN;
+ break;
+
+ case REQUIRE_ARGS:
+ if (EMPTY()) {
+ err_setstr(TypeError,
+ "function expects argument(s)");
+ why = WHY_EXCEPTION;
+ }
+ break;
+
+ case REFUSE_ARGS:
+ if (!EMPTY()) {
+ err_setstr(TypeError,
+ "function expects no argument(s)");
+ why = WHY_EXCEPTION;
+ }
+ break;
+
+ case BUILD_FUNCTION:
+ v = POP();
+ x = newfuncobject(v, f->f_globals);
+ DECREF(v);
+ PUSH(x);
+ break;
+
+ case POP_BLOCK:
+ {
+ block *b = pop_block(f);
+ while (STACK_LEVEL() > b->b_level) {
+ v = POP();
+ DECREF(v);
+ }
+ }
+ break;
+
+ case END_FINALLY:
+ v = POP();
+ if (is_intobject(v)) {
+ why = (enum why_code) getintvalue(v);
+ if (why == WHY_RETURN)
+ retval = POP();
+ }
+ else if (is_stringobject(v)) {
+ w = POP();
+ err_setval(v, w);
+ DECREF(w);
+ w = POP();
+ tb_store(w);
+ DECREF(w);
+ why = WHY_RERAISE;
+ }
+ else if (v != None) {
+ err_setstr(SystemError,
+ "'finally' pops bad exception");
+ why = WHY_EXCEPTION;
+ }
+ DECREF(v);
+ break;
+
+ case BUILD_CLASS:
+ w = POP();
+ v = POP();
+ x = build_class(v, w);
+ PUSH(x);
+ DECREF(v);
+ DECREF(w);
+ break;
+
+ case STORE_NAME:
+ name = GETNAME(oparg);
+ v = POP();
+ err = dictinsert(f->f_locals, name, v);
+ DECREF(v);
+ break;
+
+ case DELETE_NAME:
+ name = GETNAME(oparg);
+ if ((err = dictremove(f->f_locals, name)) != 0)
+ err_setstr(NameError, name);
+ break;
+
+ case UNPACK_TUPLE:
+ v = POP();
+ if (!is_tupleobject(v)) {
+ err_setstr(TypeError, "unpack non-tuple");
+ why = WHY_EXCEPTION;
+ }
+ else if (gettuplesize(v) != oparg) {
+ err_setstr(RuntimeError,
+ "unpack tuple of wrong size");
+ why = WHY_EXCEPTION;
+ }
+ else {
+ for (; --oparg >= 0; ) {
+ w = gettupleitem(v, oparg);
+ INCREF(w);
+ PUSH(w);
+ }
+ }
+ DECREF(v);
+ break;
+
+ case UNPACK_LIST:
+ v = POP();
+ if (!is_listobject(v)) {
+ err_setstr(TypeError, "unpack non-list");
+ why = WHY_EXCEPTION;
+ }
+ else if (getlistsize(v) != oparg) {
+ err_setstr(RuntimeError,
+ "unpack list of wrong size");
+ why = WHY_EXCEPTION;
+ }
+ else {
+ for (; --oparg >= 0; ) {
+ w = getlistitem(v, oparg);
+ INCREF(w);
+ PUSH(w);
+ }
+ }
+ DECREF(v);
+ break;
+
+ case STORE_ATTR:
+ name = GETNAME(oparg);
+ v = POP();
+ u = POP();
+ err = setattr(v, name, u); /* v.name = u */
+ DECREF(v);
+ DECREF(u);
+ break;
+
+ case DELETE_ATTR:
+ name = GETNAME(oparg);
+ v = POP();
+ err = setattr(v, name, (object *)NULL);
+ /* del v.name */
+ DECREF(v);
+ break;
+
+ case LOAD_CONST:
+ x = GETCONST(oparg);
+ INCREF(x);
+ PUSH(x);
+ break;
+
+ case LOAD_NAME:
+ name = GETNAME(oparg);
+ x = dictlookup(f->f_locals, name);
+ if (x == NULL) {
+ x = dictlookup(f->f_globals, name);
+ if (x == NULL)
+ x = getbuiltin(name);
+ }
+ if (x == NULL)
+ err_setstr(NameError, name);
+ else
+ INCREF(x);
+ PUSH(x);
+ break;
+
+ case BUILD_TUPLE:
+ x = newtupleobject(oparg);
+ if (x != NULL) {
+ for (; --oparg >= 0;) {
+ w = POP();
+ err = settupleitem(x, oparg, w);
+ if (err != 0)
+ break;
+ }
+ PUSH(x);
+ }
+ break;
+
+ case BUILD_LIST:
+ x = newlistobject(oparg);
+ if (x != NULL) {
+ for (; --oparg >= 0;) {
+ w = POP();
+ err = setlistitem(x, oparg, w);
+ if (err != 0)
+ break;
+ }
+ PUSH(x);
+ }
+ break;
+
+ case BUILD_MAP:
+ x = newdictobject();
+ PUSH(x);
+ break;
+
+ case LOAD_ATTR:
+ name = GETNAME(oparg);
+ v = POP();
+ x = getattr(v, name);
+ DECREF(v);
+ PUSH(x);
+ break;
+
+ case COMPARE_OP:
+ w = POP();
+ v = POP();
+ x = cmp_outcome((enum cmp_op)oparg, v, w);
+ DECREF(v);
+ DECREF(w);
+ PUSH(x);
+ break;
+
+ case IMPORT_NAME:
+ name = GETNAME(oparg);
+ x = import_module(name);
+ XINCREF(x);
+ PUSH(x);
+ break;
+
+ case IMPORT_FROM:
+ name = GETNAME(oparg);
+ v = TOP();
+ err = import_from(f->f_locals, v, name);
+ break;
+
+ case JUMP_FORWARD:
+ JUMPBY(oparg);
+ break;
+
+ case JUMP_IF_FALSE:
+ if (!testbool(TOP()))
+ JUMPBY(oparg);
+ break;
+
+ case JUMP_IF_TRUE:
+ if (testbool(TOP()))
+ JUMPBY(oparg);
+ break;
+
+ case JUMP_ABSOLUTE:
+ JUMPTO(oparg);
+ break;
+
+ case FOR_LOOP:
+ /* for v in s: ...
+ On entry: stack contains s, i.
+ On exit: stack contains s, i+1, s[i];
+ but if loop exhausted:
+ s, i are popped, and we jump */
+ w = POP(); /* Loop index */
+ v = POP(); /* Sequence object */
+ u = loop_subscript(v, w);
+ if (u != NULL) {
+ PUSH(v);
+ x = newintobject(getintvalue(w)+1);
+ PUSH(x);
+ DECREF(w);
+ PUSH(u);
+ }
+ else {
+ DECREF(v);
+ DECREF(w);
+ /* A NULL can mean "s exhausted"
+ but also an error: */
+ if (err_occurred())
+ why = WHY_EXCEPTION;
+ else
+ JUMPBY(oparg);
+ }
+ break;
+
+ case SETUP_LOOP:
+ case SETUP_EXCEPT:
+ case SETUP_FINALLY:
+ setup_block(f, opcode, INSTR_OFFSET() + oparg,
+ STACK_LEVEL());
+ break;
+
+ case SET_LINENO:
+#ifdef TRACE
+ if (trace)
+ printf("--- Line %d ---\n", oparg);
+#endif
+ lineno = oparg;
+ break;
+
+ default:
+ fprintf(stderr,
+ "XXX lineno: %d, opcode: %d\n",
+ lineno, opcode);
+ err_setstr(SystemError, "eval_code: unknown opcode");
+ why = WHY_EXCEPTION;
+ break;
+
+ } /* switch */
+
+
+ /* Quickly continue if no error occurred */
+
+ if (why == WHY_NOT) {
+ if (err == 0 && x != NULL)
+ continue; /* Normal, fast path */
+ why = WHY_EXCEPTION;
+ x = None;
+ err = 0;
+ }
+
+#ifndef NDEBUG
+ /* Double-check exception status */
+
+ if (why == WHY_EXCEPTION || why == WHY_RERAISE) {
+ if (!err_occurred()) {
+ fprintf(stderr, "XXX ghost error\n");
+ err_setstr(SystemError, "ghost error");
+ why = WHY_EXCEPTION;
+ }
+ }
+ else {
+ if (err_occurred()) {
+ fprintf(stderr, "XXX undetected error\n");
+ why = WHY_EXCEPTION;
+ }
+ }
+#endif
+
+ /* Log traceback info if this is a real exception */
+
+ if (why == WHY_EXCEPTION) {
+ int lasti = INSTR_OFFSET() - 1;
+ if (HAS_ARG(opcode))
+ lasti -= 2;
+ tb_here(f, lasti, lineno);
+ }
+
+ /* For the rest, treat WHY_RERAISE as WHY_EXCEPTION */
+
+ if (why == WHY_RERAISE)
+ why = WHY_EXCEPTION;
+
+ /* Unwind stacks if a (pseudo) exception occurred */
+
+ while (why != WHY_NOT && f->f_iblock > 0) {
+ block *b = pop_block(f);
+ while (STACK_LEVEL() > b->b_level) {
+ v = POP();
+ XDECREF(v);
+ }
+ if (b->b_type == SETUP_LOOP && why == WHY_BREAK) {
+ why = WHY_NOT;
+ JUMPTO(b->b_handler);
+ break;
+ }
+ if (b->b_type == SETUP_FINALLY ||
+ b->b_type == SETUP_EXCEPT &&
+ why == WHY_EXCEPTION) {
+ if (why == WHY_EXCEPTION) {
+ object *exc, *val;
+ err_get(&exc, &val);
+ if (val == NULL) {
+ val = None;
+ INCREF(val);
+ }
+ v = tb_fetch();
+ /* Make the raw exception data
+ available to the handler,
+ so a program can emulate the
+ Python main loop. Don't do
+ this for 'finally'. */
+ if (b->b_type == SETUP_EXCEPT) {
+#if 0 /* Oops, this breaks too many things */
+ sysset("exc_traceback", v);
+#endif
+ sysset("exc_value", val);
+ sysset("exc_type", exc);
+ err_clear();
+ }
+ PUSH(v);
+ PUSH(val);
+ PUSH(exc);
+ }
+ else {
+ if (why == WHY_RETURN)
+ PUSH(retval);
+ v = newintobject((long)why);
+ PUSH(v);
+ }
+ why = WHY_NOT;
+ JUMPTO(b->b_handler);
+ break;
+ }
+ } /* unwind stack */
+
+ /* End the loop if we still have an error (or return) */
+
+ if (why != WHY_NOT)
+ break;
+
+ } /* main loop */
+
+ /* Pop remaining stack entries */
+
+ while (!EMPTY()) {
+ v = POP();
+ XDECREF(v);
+ }
+
+ /* Restore previous frame and release the current one */
+
+ current_frame = f->f_back;
+ DECREF(f);
+
+ if (why == WHY_RETURN)
+ return retval;
+ else
+ return NULL;
+}