1 files changed, 1352 insertions, 0 deletions
diff --git a/src/sc_interpr.c b/src/sc_interpr.c
new file mode 100644
index 0000000..10eb1b2
--- /dev/null
+++ b/src/sc_interpr.c
@@ -0,0 +1,1352 @@
+/***********************************************************
+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.
+
+******************************************************************/
+
+#if 0
+#define STACK_TRACE
+#define SCDEBUG
+#endif
+#include <stdio.h>
+
+#include <ailamoeba.h>
+
+#include "PROTO.h"
+#include "sc_global.h"
+#include "object.h"
+#include "objimpl.h"
+#include "stringobject.h"
+#include "errors.h"
+#include "sc_errors.h"
+#include "stubcode.h"
+#include "tupleobject.h"
+#include "intobject.h"
+#include "listobject.h"
+
+typedef struct s_loopstruct {
+ struct s_loopstruct *l_next; /* Make a list of it */
+ TscOperand l_label; /* Indentify the loop */
+ int l_index; /* The index of the list */
+ int l_size; /* The size of the list */
+ int l_retaddr; /* Addres to jump back */
+ int l_endaddr; /* Addres to jump to end */
+ object *l_list; /* The list to append to */
+} TsLoop, *TpsLoop;
+
+
+/*
+** This file contains the Stubcode interpreter.
+** All the instructions have there own function. The interpreter
+** reads an instruction from the data and if needed also an operand.
+** After this it calls the function that executes the instruction.
+*/
+
+struct sc_ProcessBlock {
+ object **stack;
+ unsigned char *buffer, *data;
+ int sp, bp, pc, maxbufsize, datsize;
+ header hdr;
+ TpsLoop loops;
+};
+
+extern getcapability();
+
+/*
+ * Clean up the mess the loops make.
+ */
+
+static void
+xCleanUpLoops(sc_pb)
+ struct sc_ProcessBlock *sc_pb;
+{
+ TpsLoop prev, this;
+
+ if (sc_pb->loops == NULL)
+ return;
+ prev = sc_pb->loops;
+ this = sc_pb->loops->l_next;
+ while(this) {
+ free((char *)prev);
+ prev = this;
+ this = this->l_next;
+ }
+ free((char *)prev);
+}
+
+static int
+findendloop(label, sc_pb)
+ TscOperand label;
+ struct sc_ProcessBlock *sc_pb;
+{
+ TscOperand operand;
+ TscOpcode opcode;
+ int walk = sc_pb->pc, found = 0;
+
+ while (!found && (walk < sc_pb->datsize)) {
+ memcpy(&opcode, &sc_pb->data[walk], sizeof(TscOpcode));
+ walk += sizeof(TscOpcode);
+ if (opcode & (FLAGS | OPERAND)) {
+ memcpy(&operand, &sc_pb->data[walk], sizeof(TscOperand));
+ walk += sizeof(TscOperand);
+ }
+ if (opcode == EndLoop)
+ if (operand == label) found = 1;
+ }
+ if (found)
+ return walk;
+ return -1;
+}
+
+static int
+findloop(ret, label, sc_pb)
+ TpsLoop *ret;
+ TscOperand label;
+ struct sc_ProcessBlock *sc_pb;
+{
+ TpsLoop walk;
+
+ for (walk = sc_pb->loops; walk != NULL; walk = walk->l_next) {
+ if (walk->l_label == label) break;
+ }
+ if (walk == NULL) {
+ TpsLoop newloop;
+
+ newloop = (TpsLoop)malloc(sizeof(TsLoop));
+ if (newloop == NULL) {
+ err_nomem();
+ return -1;
+ }
+ newloop->l_label = label;
+ newloop->l_index = 0;
+ newloop->l_retaddr = sc_pb->pc - (sizeof(TscOpcode) + sizeof(TscOperand));
+ /*
+ ** We need a correction because the pc points to
+ ** the instruction after the XXXLoop.
+ */
+ if ((newloop->l_endaddr = findendloop(label, sc_pb)) < 0) {
+ free((char *)newloop);
+ err_scerr(NoEndLoop);
+ return -1;
+ }
+ newloop->l_list = NULL;
+ newloop->l_next = sc_pb->loops;
+ sc_pb->loops = newloop;
+ *ret = newloop;
+ return 1;
+ }
+ *ret = walk;
+ return 0;
+}
+
+#ifdef 0
+
+static void
+removeloop(this, sc_pb)
+ TpsLoop this;
+ struct sc_ProcessBlock *sc_pb;
+{
+ TpsLoop walk, prev = NULL;
+
+ for (walk = sc_pb->loops; walk != NULL; walk = walk->l_next) {
+ if (walk->l_label == this->l_label) {
+ if (prev != NULL) {
+ prev->l_next = walk->l_next;
+ } else {
+ loop = walk->l_next;
+ }
+ free((char *)this);
+ break;
+ }
+ prev = walk;
+ }
+}
+
+#endif
+
+static int
+init(self, sc_pb)
+ object *self;
+ struct sc_ProcessBlock *sc_pb;
+{
+object *string;
+int datasize;
+
+ string = gettupleitem(self, STUBC);
+ if (string == NULL)
+ return -1;
+ sc_pb->data = getstringvalue(string);
+ if (sc_pb->data == NULL)
+ return -1;
+ datasize = (int)getstringsize(string);
+ if (datasize == -1)
+ return -1;
+ sc_pb->stack = (object **)malloc(STKSIZE * sizeof(object *));
+ if (sc_pb->stack == NULL) {
+ err_nomem();
+ return -1;
+ }
+ sc_pb->bp = sc_pb->sp = sc_pb->pc = 0;
+ sc_pb->loops = NULL;
+ return datasize;
+}
+
+static void reinit(sc_pb)
+ struct sc_ProcessBlock *sc_pb;
+{
+ int i;
+
+ sc_pb->bp = 0;
+ for (i = 0; i < sc_pb->sp; i++) {
+ DECREF(sc_pb->stack[i]);
+ }
+ sc_pb->sp = 0;
+}
+
+static void UnInit(self, sc_pb)
+ object *self;
+ struct sc_ProcessBlock *sc_pb;
+{
+ int i;
+
+ free(sc_pb->buffer);
+ reinit(sc_pb);
+ free((char *)sc_pb->stack);
+ xCleanUpLoops(sc_pb);
+}
+
+static object *
+stacktop(sc_pb)
+ struct sc_ProcessBlock *sc_pb;
+{
+
+ if (sc_pb->sp == 0)
+ return err_scerr(StackUnderflow);
+ if (sc_pb->sp == (STKSIZE + 1))
+ return err_scerr(StackOverflow);
+ return sc_pb->stack[sc_pb->sp - 1];
+}
+
+/*
+ * Push an object on the stack.
+ */
+static int
+xPush(element, sc_pb)
+ object *element;
+ struct sc_ProcessBlock *sc_pb;
+{
+
+ if (sc_pb->sp >= STKSIZE) {
+ err_scerr(StackOverflow);
+ return -1;
+ }
+ if (element == NULL) {
+ err_scerr(ElementIsNull);
+ return -1;
+ }
+ INCREF(element);
+#ifdef STACK_TRACE
+ printf("pushed :");
+ printobject(element, stdout, 0);
+ printf("\n");
+#endif
+ sc_pb->stack[sc_pb->sp++] = element;
+ return 0;
+}
+
+/*
+ * Perform the RPC.
+ */
+static int
+xTrans(self,cmd, sc_pb)
+ object *self;
+ TscOperand cmd;
+ struct sc_ProcessBlock *sc_pb;
+{
+ short ret;
+ capability cap;
+ object *capobj;
+
+ if ((capobj = gettupleitem(self, CAP)) == NULL)
+ return -1;
+ if (getcapability(capobj, &cap) == -1)
+ return -1;
+ sc_pb->hdr.h_port = cap.cap_port;
+ sc_pb->hdr.h_priv = cap.cap_priv;
+ sc_pb->hdr.h_command = (command)cmd;
+#ifdef SCDEBUG
+ printf("bp = %d maxbufsize = %d\n",sc_pb->bp, sc_pb->maxbufsize);
+ {
+ int i;
+
+ for (i = 0; i < sc_pb->bp; i++) {
+ printf("%x ", sc_pb->buffer[i]);
+ }
+ }
+ printf("\n");
+#endif
+ ret = trans(&sc_pb->hdr, sc_pb->buffer, (bufsize) sc_pb->bp,
+ &sc_pb->hdr, sc_pb->buffer, (bufsize)sc_pb->maxbufsize);
+#ifdef SCDEBUG
+ printf("after Trans:ret = %d\n",ret);
+ {
+ int i;
+
+ for (i = 0; i < ret; i++) {
+ printf("%x ", sc_pb->buffer[i]);
+ }
+ }
+ printf("\n");
+#endif
+ if (ERR_STATUS(ret)) {
+ amoeba_error(ERR_CONVERT(ret));
+ return -1;
+ }
+ if (sc_pb->hdr.h_status != 0) {
+ object *v;
+
+ if ((v = newintobject(sc_pb->hdr.h_status)) == NULL)
+ return -1;
+ err_scerrset(TransError, v, "Trans");
+ DECREF(v);
+ return -1;
+ }
+ reinit(sc_pb);
+ return 0;
+}
+
+/*
+ * Test the tuple size.
+ */
+static int
+xTTupleS(size, sc_pb)
+ TscOperand size;
+ struct sc_ProcessBlock *sc_pb;
+{
+ object *tuple;
+
+ if ((tuple = stacktop(sc_pb)) == NULL)
+ return -1;
+ if (!is_tupleobject(tuple))
+ return err_scerrset(TypeFailure, tuple, "TTupleS");
+ if (gettuplesize(tuple) != (unsigned int)size)
+ return err_scerrset(SizeError, tuple, "TTupleS");
+ return 0;
+}
+
+/*
+ * Unpack a tuple
+ */
+static int
+xUnpack(size, sc_pb)
+ TscOperand size;
+ struct sc_ProcessBlock *sc_pb;
+{
+ object *tuple, *element;
+ int i;
+
+ if (size < (TscOperand)2) {
+ element = newintobject(size);
+ if (element == NULL)
+ return -1;
+ return err_scerrset(SizeError, element, "Unpack");
+ }
+ if ((tuple = stacktop(sc_pb)) == NULL)
+ return -1;
+ INCREF(tuple);
+ if (xPop((TscOperand) 1, sc_pb) != 0) {
+ DECREF(tuple);
+ return -1;
+ }
+ for (i = 0; i < (int)size; i++) {
+ if ((element = gettupleitem(tuple, i)) == NULL) {
+ DECREF(tuple);
+ return -1;
+ }
+ if (xPush(element, sc_pb) != 0) {
+ DECREF(tuple);
+ return -1;
+ }
+ }
+ DECREF(tuple);
+ return 0;
+}
+
+/*
+ * Marshal the Ailword to a headerfiels.
+ */
+static int
+xAilword(headerfield, sc_pb)
+ TscOperand headerfield;
+ struct sc_ProcessBlock *sc_pb;
+{
+
+ switch(headerfield) {
+
+ case H_EXTRA:
+ sc_pb->hdr.h_extra = (uint16)_ailword;
+ return 0;
+
+ case H_SIZE:
+ sc_pb->hdr.h_size = (bufsize)_ailword;
+ return 0;
+
+ case H_OFFSET:
+ sc_pb->hdr.h_offset = (int32)_ailword;
+ return 0;
+
+ default:
+ {
+ object *v;
+
+ if ((v = newintobject(headerfield)) == NULL)
+ return -1;
+ return err_scerrset(FlagError, v, "Ailword");
+ }
+ }
+}
+
+static int
+xStringS(sc_pb)
+ struct sc_ProcessBlock *sc_pb;
+{
+ object *size, *string;
+ int s;
+
+ if ((string = stacktop(sc_pb)) == NULL)
+ return -1;
+ if (!is_stringobject(string))
+ return err_scerrset(TypeFailure, string, "StringS");
+ if ((s = getstringsize(string)) < 0)
+ return -1;
+ if (xPop((TscOperand) 1, sc_pb) != 0)
+ return -1;
+ if ((size = newintobject(s)) == NULL)
+ return -1;
+ if (xPush(size, sc_pb) != 0) {
+ DECREF(size);
+ return -1;
+ }
+ DECREF(size);
+ return 0;
+}
+
+/*
+ *
+ */
+static int
+xListS(sc_pb)
+ struct sc_ProcessBlock *sc_pb;
+{
+ object *size, *list;
+ int s;
+
+ if ((list = stacktop(sc_pb)) == NULL)
+ return -1;
+ if (!is_listobject(list))
+ return err_scerrset(TypeFailure, list, "ListS");
+ if ((s = getlistsize(list)) < 0)
+ return -1;
+ if (xPop((TscOperand) 1, sc_pb) != 0)
+ return -1;
+ if ((size = newintobject(s)) == NULL)
+ return -1;
+ if (xPush(size, sc_pb) != 0) {
+ DECREF(size);
+ return -1;
+ }
+ DECREF(size);
+ return 0;
+}
+
+/*
+ * Marshal a fixed string to the buffer.
+ */
+static int
+xPutFS(size, sc_pb)
+ TscOperand size;
+ struct sc_ProcessBlock *sc_pb;
+{
+ object *string;
+ char *str;
+
+ if ((string = stacktop(sc_pb)) == NULL) {
+ return -1;
+ }
+ if (!is_stringobject(string))
+ return err_scerrset(TypeFailure, string, "PutFS");
+ if (getstringsize(string) != size)
+ return err_scerrset(SizeError, string, "PutFS");
+ if ((str = getstringvalue(string)) == NULL)
+ return -1;
+ if ((size + sc_pb->bp) > sc_pb->maxbufsize) {
+ err_scerr(BufferOverflow);
+ return -1;
+ }
+ memcpy(&sc_pb->buffer[sc_pb->bp], str, (int)size);
+ sc_pb->bp += size;
+ return xPop((TscOperand) 1, sc_pb);
+}
+
+
+/*
+ * Test the size of a string or list
+ */
+static int
+xTStringSeq(size, sc_pb)
+ TscOperand size;
+ struct sc_ProcessBlock *sc_pb;
+{
+ object *string;
+
+ if ((string = stacktop(sc_pb)) == NULL)
+ return -1;
+ if (!is_stringobject(string))
+ return err_scerrset(TypeFailure, string, "TStringSeq");
+ if (getstringsize(string) != size)
+ return err_scerrset(SizeError, string, "TStringSeq");
+ return 0;
+}
+
+static int
+xTStringSlt(size, sc_pb)
+ TscOperand size;
+ struct sc_ProcessBlock *sc_pb;
+{
+ object *string;
+
+ if ((string = stacktop(sc_pb)) == NULL)
+ return -1;
+ if (!is_stringobject(string))
+ return err_scerrset(TypeFailure, string, "TStringSlt");
+ if (getstringsize(string) > size)
+ return err_scerrset(SizeError, string, "TStringSlt");
+ return 0;
+}
+
+static int
+xTListSeq(size, sc_pb)
+ TscOperand size;
+ struct sc_ProcessBlock *sc_pb;
+{
+ object *list;
+
+ if ((list = stacktop(sc_pb)) == NULL)
+ return -1;
+ if (!is_listobject(list))
+ return err_scerrset(TypeFailure, list, "TListSeq");
+ if (getlistsize(list) != size)
+ return err_scerrset(SizeError, list, "TListSeq");
+ return 0;
+}
+
+static int
+xTListSlt(size, sc_pb)
+ TscOperand size;
+ struct sc_ProcessBlock *sc_pb;
+{
+ object *list;
+
+ if ((list = stacktop(sc_pb)) == NULL)
+ return -1;
+ if (!is_listobject(list))
+ return err_scerrset(TypeFailure, list, "TListSlt");
+ if (getlistsize(list) > size)
+ return err_scerrset(SizeError, list, "TListSlt");
+ return 0;
+}
+
+static int
+xPutVS(sc_pb)
+ struct sc_ProcessBlock *sc_pb;
+{
+ object *string;
+ char *str;
+ int size;
+
+ if ((string = stacktop(sc_pb)) == NULL)
+ return -1;
+ if ((size = getstringsize(string)) < 0)
+ return (size == -1 ? -1 : err_scerrset(SizeError, string, "PutVS"));
+ if ((str = getstringvalue(string)) == NULL)
+ return -1;
+ if (sc_pb->bp + size > sc_pb->maxbufsize) {
+ err_scerr(BufferOverflow);
+ return -1;
+ }
+ memcpy(&sc_pb->buffer[sc_pb->bp], str, size);
+ sc_pb->bp += size;
+ return xPop((TscOperand) 1, sc_pb);
+}
+
+/*
+ * The loop instructions.
+ */
+static int
+xLoopPut(label, sc_pb)
+ TscOperand label;
+ struct sc_ProcessBlock *sc_pb;
+{
+ TpsLoop this;
+ object *list, *element;
+
+ if (findloop(&this, label, sc_pb) < 0)
+ return -1;
+ if ((list = stacktop(sc_pb)) == NULL)
+ return -1;
+ if (!is_listobject(list))
+ return err_scerrset(TypeFailure, list, "LoopPut");
+ if (this->l_index >= getlistsize(list)) {
+ sc_pb->pc = this->l_endaddr;
+ /*
+ ** Pop the list from the stack
+ */
+ return xPop((TscOperand)1, sc_pb);
+ }
+ if ((element = getlistitem(list, this->l_index)) == NULL)
+ return -1;
+ return xPush(element, sc_pb);
+}
+
+static int
+xLoopGet(label, sc_pb)
+ TscOperand label;
+ struct sc_ProcessBlock *sc_pb;
+{
+ TpsLoop this;
+ object *element, *integer;
+ int i;
+
+ if ((i = findloop(&this, label, sc_pb)) < 0)
+ return -1;
+ else if (i == 1) {
+ /*
+ * It is the first time we enter LoopGet label
+ */
+ if ((this->l_list = newlistobject(0)) == NULL)
+ return -1;
+ if ((integer = stacktop(sc_pb)) == NULL)
+ return -1;
+ if (!is_intobject(integer))
+ return err_scerrset(TypeFailure, integer, "LoopGet");
+ this->l_size = getintvalue(integer);
+ if (xPop((TscOperand) 1, sc_pb) != 0)
+ return -1;
+ } else {
+ if ((element = stacktop(sc_pb)) == NULL)
+ return -1;
+ if (addlistitem(this->l_list, element) != 0)
+ return -1;
+ if (xPop((TscOperand) 1, sc_pb) != 0)
+ return -1;
+ }
+ if (this->l_index >= this->l_size) {
+ int ret;
+
+ sc_pb->pc = this->l_endaddr;
+ ret = xPush(this->l_list, sc_pb);
+ DECREF(this->l_list);
+ return ret;
+ }
+ return 0;
+}
+
+static int
+xEndLoop(label, sc_pb)
+ TscOperand label;
+ struct sc_ProcessBlock *sc_pb;
+{
+ TpsLoop this;
+
+ if (findloop(&this, label, sc_pb) < 0)
+ return -1;
+ this ->l_index += 1;
+ sc_pb->pc = this->l_retaddr;
+ return 0;
+}
+
+static int
+xPutI(flags, sc_pb)
+ TscOperand flags;
+ struct sc_ProcessBlock *sc_pb;
+{
+ object *integer;
+
+ if ((integer = stacktop(sc_pb)) == NULL)
+ return -1;
+ if (!is_intobject(integer))
+ return err_scerrset(TypeFailure, integer, "PutI");
+ if (flags & ALL_FIELDS) {
+ long i;
+
+ /*
+ * The integer must be marshalles in the header.
+ * No type casting according to the type flag because
+ * we have to cast to the headerfield types.
+ */
+ i = getintvalue(integer);
+ switch(flags & ALL_FIELDS) {
+
+ case H_EXTRA:
+ sc_pb->hdr.h_extra = (uint16)i;
+ break;
+
+ case H_SIZE:
+ sc_pb->hdr.h_size = (bufsize)i;
+ break;
+
+ case H_OFFSET:
+ sc_pb->hdr.h_offset = (int32)i;
+ break;
+
+ default:
+ if ((integer = newintobject(flags & ALL_FIELDS)) == NULL)
+ return -1;
+ err_scerrset(FlagError, integer, "Ailword");
+ DECREF(integer);
+ return -1;
+ }
+ } else {
+ long i;
+
+ i = getintvalue(integer);
+ switch(flags & ALLTYPES) {
+
+ case 0:
+ {
+ int16 x;
+
+ x = (int16)i;
+ if ((sc_pb->bp + sizeof(int16)) > sc_pb->maxbufsize) {
+ err_scerr(BufferOverflow);
+ return -1;
+ }
+ memcpy(&sc_pb->buffer[sc_pb->bp], &x, sizeof(int16));
+ sc_pb->bp += sizeof(int16);
+ break;
+ }
+
+ case NOSIGN:
+ {
+ uint16 x;
+
+ x = (uint16)i;
+ if ((sc_pb->bp + sizeof(uint16)) > sc_pb->maxbufsize) {
+ err_scerr(BufferOverflow);
+ return -1;
+ }
+ memcpy(&sc_pb->buffer[sc_pb->bp], &x, sizeof(uint16));
+ sc_pb->bp += sizeof(uint16);
+ break;
+ }
+
+ case INT32:
+ {
+ int32 x;
+
+ x = (int32)i;
+ if ((sc_pb->bp + sizeof(int32)) > sc_pb->maxbufsize) {
+ err_scerr(BufferOverflow);
+ return -1;
+ }
+ memcpy(&sc_pb->buffer[sc_pb->bp], &x, sizeof(int32));
+ sc_pb->bp += sizeof(int32);
+ break;
+ }
+
+ case INT32 | NOSIGN:
+ {
+ uint32 x;
+
+ x = (uint32)i;
+ if ((sc_pb->bp + sizeof(uint32)) > sc_pb->maxbufsize) {
+ err_scerr(BufferOverflow);
+ return -1;
+ }
+ memcpy(&sc_pb->buffer[sc_pb->bp], &x, sizeof(uint32));
+ sc_pb->bp += sizeof(uint32);
+ break;
+ }
+ default:
+ {
+ object *x;
+
+ if ((x = newintobject(flags)) == NULL)
+ return -1;
+ err_scerrset(FlagError, x, "PutI");
+ DECREF(x);
+ return -1;
+ }
+ }
+ }
+ return xPop((TscOperand)1, sc_pb);
+}
+
+static int
+xPutC(sc_pb)
+ struct sc_ProcessBlock *sc_pb;
+{
+ capability cap;
+ object *capobj;
+
+ if ((capobj = stacktop(sc_pb)) == NULL)
+ return -1;
+ if (!is_capobj(capobj))
+ return err_scerrset(TypeFailure, capobj, "xPutC");
+ if (getcapability(capobj, &cap) != 0)
+ return -1;
+ if ((sc_pb->bp + CAPSIZE) > sc_pb->maxbufsize) {
+ err_scerr(BufferOverflow);
+ return -1;
+ }
+ memcpy(&sc_pb->buffer[sc_pb->bp], &cap, CAPSIZE);
+ sc_pb->bp += CAPSIZE;
+ return xPop((TscOperand) 1, sc_pb);
+}
+
+static int
+xDup(n, sc_pb)
+ TscOperand n;
+ struct sc_ProcessBlock *sc_pb;
+{
+
+ if ((int)n > sc_pb->sp) {
+ object *i;
+
+ if ((i = newintobject((long)n)) == NULL)
+ return -1;
+ err_scerrset(RangeError, i, "Dup");
+ DECREF(i);
+ return -1;
+ }
+ return xPush(sc_pb->stack[sc_pb->sp - n], sc_pb);
+}
+
+static int
+xPop(n, sc_pb)
+ TscOperand n;
+ struct sc_ProcessBlock *sc_pb;
+{
+ int i;
+
+ if ((sc_pb->sp - (int)n) < 0) {
+ err_scerr(StackUnderflow);
+ return -1;
+ }
+ for (i = 0; i < (int)n; i++) {
+ sc_pb->sp--;
+#ifdef STACK_TRACE
+ printf("popped :");
+ printobject(sc_pb->stack[sc_pb->sp], stdout, 0);
+ printf("\n");
+#endif
+ DECREF(sc_pb->stack[sc_pb->sp]);
+ }
+ return 0;
+}
+
+static int
+xAlign(n, sc_pb)
+ TscOperand n;
+ struct sc_ProcessBlock *sc_pb;
+{
+ int align = sc_pb->bp % (int)n;
+
+#ifdef SCDEBUG
+ printf("Old bp = %d\n", sc_pb->bp);
+#endif
+ sc_pb->bp += (align == 0) ? 0 : ((int)n - align);
+#ifdef SCDEBUG
+ printf("New bp = %d\n", sc_pb->bp);
+#endif
+ return 0;
+}
+
+static int
+xPack(size, sc_pb)
+ TscOperand size;
+ struct sc_ProcessBlock *sc_pb;
+{
+ object *element, *tuple;
+ int i, ret;
+
+ if ((tuple = newtupleobject((int)size)) == NULL)
+ return -1;
+ for (i = 0; i < (int)size; i++) {
+ if ((element = stacktop(sc_pb)) == NULL)
+ return -1;
+ if (settupleitem(tuple, (int)size - i - 1, element) != 0)
+ return -1;
+ INCREF(element);
+ if (xPop((TscOperand) 1, sc_pb) != 0)
+ return -1;
+ }
+ ret = xPush(tuple, sc_pb);
+ DECREF(tuple);
+ return ret;
+}
+
+static int
+xGetVS(sc_pb)
+ struct sc_ProcessBlock *sc_pb;
+{
+ object *string, *integer;
+ int size;
+
+ if ((integer = stacktop(sc_pb)) == NULL)
+ return -1;
+ if (!is_intobject(integer))
+ return err_scerrset(TypeFailure, integer, "GetVS");
+ size = getintvalue(integer);
+ if ((sc_pb->bp + size) > sc_pb->maxbufsize) {
+ err_scerr(BufferOverflow);
+ return -1;
+ }
+ if ((string = newsizedstringobject(&sc_pb->buffer[sc_pb->bp], size)) == NULL)
+ return -1;
+ sc_pb->bp += size;
+ if (xPop((TscOperand) 1, sc_pb) != 0)
+ return -1;
+ if (xPush(string, sc_pb) != 0) {
+ return -1;
+ }
+ DECREF(string);
+ return 0;
+}
+
+static int
+xGetFS(size, sc_pb)
+ TscOperand size;
+ struct sc_ProcessBlock *sc_pb;
+{
+ object *string;
+
+ if ((sc_pb->bp + (int)size) > sc_pb->maxbufsize) {
+ err_scerr(BufferOverflow);
+ return -1;
+ }
+ if ((string = newsizedstringobject(&sc_pb->buffer[sc_pb->bp], (int)size)) == NULL)
+ return -1;
+ sc_pb->bp += (int)size;
+ if(xPush(string, sc_pb) != 0) {
+ return -1;
+ }
+ DECREF(string);
+ return 0;
+}
+
+static int
+xGetI(flags, sc_pb)
+ TscOperand flags;
+ struct sc_ProcessBlock *sc_pb;
+{
+ object *integer;
+ long i;
+
+ if (flags & ALL_FIELDS) {
+
+ switch(flags & ALL_FIELDS) {
+
+ case H_EXTRA:
+ i = (long)sc_pb->hdr.h_extra;
+ break;
+
+ case H_SIZE:
+ i = (long)sc_pb->hdr.h_size;
+ break;
+
+ case H_OFFSET:
+ i = (long)sc_pb->hdr.h_offset;
+ break;
+
+ default:
+ if ((integer = newintobject(flags & ALL_FIELDS)) == NULL)
+ return -1;
+ err_scerrset(FlagError, integer, "Ailword");
+ DECREF(integer);
+ return -1;
+ }
+ } else {
+ switch(flags & ALLTYPES) {
+
+ case 0:
+ {
+ int16 x;
+
+ if ((sc_pb->bp + sizeof(int16)) > sc_pb->maxbufsize) {
+ err_scerr(BufferOverflow);
+ return -1;
+ }
+ memcpy(&x, &sc_pb->buffer[sc_pb->bp], sizeof(int16));
+ sc_pb->bp += sizeof(int16);
+ i = (long)x;
+ break;
+ }
+
+ case NOSIGN:
+ {
+ uint16 x;
+
+ if ((sc_pb->bp + sizeof(uint16)) > sc_pb->maxbufsize) {
+ err_scerr(BufferOverflow);
+ return -1;
+ }
+ memcpy(&x, &sc_pb->buffer[sc_pb->bp], sizeof(uint16));
+ sc_pb->bp += sizeof(uint16);
+ i = (long)x;
+ break;
+ }
+
+ case INT32:
+ {
+ int32 x;
+
+ if ((sc_pb->bp + sizeof(int32)) > sc_pb->maxbufsize) {
+ err_scerr(BufferOverflow);
+ return -1;
+ }
+ memcpy(&x, &sc_pb->buffer[sc_pb->bp], sizeof(int32));
+ sc_pb->bp += sizeof(int32);
+ i = (long)x;
+ break;
+ }
+
+ case INT32 | NOSIGN:
+ {
+ uint32 x;
+
+ if ((sc_pb->bp + sizeof(uint32)) > sc_pb->maxbufsize) {
+ err_scerr(BufferOverflow);
+ return -1;
+ }
+ memcpy(&x, &sc_pb->buffer[sc_pb->bp], sizeof(uint32));
+ sc_pb->bp += sizeof(uint32);
+ i = (long)x;
+ break;
+ }
+ default:
+ {
+ if ((integer = newintobject(flags)) == NULL)
+ return -1;
+ err_scerrset(FlagError, integer, "GetI");
+ DECREF(integer);
+ return -1;
+ }
+ }
+ }
+ if ((integer = newintobject(i)) == NULL)
+ return -1;
+ if (xPush(integer, sc_pb) != 0) {
+ DECREF(integer);
+ return -1;
+ }
+ DECREF(integer);
+ return 0;
+}
+
+static int
+xGetC(flags, sc_pb)
+ TscOperand flags;
+ struct sc_ProcessBlock *sc_pb;
+{
+ extern object *newcapobject();
+ object *capobj;
+ capability cap;
+
+ if ((int)flags != 0) {
+ switch ((int)flags) {
+
+ case PSEUDOFIELD:
+ cap.cap_port = sc_pb->hdr.h_port;
+ cap.cap_priv = sc_pb->hdr.h_priv;
+ break;
+ }
+ } else {
+ if ((CAPSIZE + sc_pb->bp) > sc_pb->maxbufsize) {
+ err_scerr(BufferOverflow);
+ return -1;
+ }
+ memcpy(&cap, &sc_pb->buffer[sc_pb->bp], CAPSIZE);
+ }
+ if ((capobj = newcapobject(&cap)) == NULL)
+ return -1;
+ return xPush(capobj, sc_pb);
+}
+
+static int
+xEqual(sc_pb)
+ struct sc_ProcessBlock *sc_pb;
+{
+ object *int1, *int2;
+
+ if (sc_pb->sp < 2) {
+ err_scerr(StackUnderflow);
+ return -1;
+ }
+ int1 = sc_pb->stack[sc_pb->sp - 1];
+ int2 = sc_pb->stack[sc_pb->sp - 2];
+ if ((int1 == NULL) || (int2 == NULL))
+ return -1;
+ if (!is_intobject(int1))
+ return err_scerrset(TypeFailure, int1, "Equal");
+ if (!is_intobject(int2))
+ return err_scerrset(TypeFailure, int2, "Equal");
+ if (getintvalue(int1) != getintvalue(int2)) {
+ object *tmptuple;
+
+ if ((tmptuple = newtupleobject(2)) == NULL)
+ return -1;
+ INCREF(int1);
+ if (settupleitem(tmptuple, 0, int1) != 0) {
+ DECREF(tmptuple);
+ DECREF(int1);
+ return -1;
+ }
+ if (settupleitem(tmptuple, 1, int2) != 0) {
+ DECREF(tmptuple);
+ DECREF(int2);
+ return -1;
+ }
+ return err_scerrset(SizeError, tmptuple, "Equal");
+ }
+ return 0;
+}
+
+object *
+sc_interpreter(self, args)
+ object *self, *args;
+{
+TscOpcode opcode;
+TscOperand operand;
+int datasize, ret;
+object *returnobject;
+struct sc_ProcessBlock sc_pb;
+
+ if ((datasize = init(self, &sc_pb)) < 0)
+ return NULL;
+ memcpy(&opcode, sc_pb.data, sizeof(TscOpcode));
+ sc_pb.datsize = datasize;
+ sc_pb.pc += sizeof(TscOpcode);
+ if (opcode != BufSize) {
+ free((char *)sc_pb.stack);
+ return err_scerr(NoBufSize);
+ }
+ memcpy(&operand, &sc_pb.data[sc_pb.pc], sizeof(TscOperand));
+ sc_pb.pc += sizeof(TscOperand);
+ sc_pb.buffer = (unsigned char *)malloc(operand);
+ sc_pb.maxbufsize = (int)operand;
+ if (sc_pb.buffer == NULL) {
+ free((char *)sc_pb.stack);
+ return err_nomem();
+ }
+ memcpy(&opcode, &sc_pb.data[sc_pb.pc], sizeof(TscOpcode));
+ if (opcode != NoArgs) {
+ if (xPush(args, &sc_pb) != 0) {
+ UnInit(self, &sc_pb);
+ return NULL;
+ }
+ }
+ while (sc_pb.pc < datasize) {
+ memcpy(&opcode, &sc_pb.data[sc_pb.pc], sizeof(TscOpcode));
+ sc_pb.pc += sizeof(TscOpcode);
+ if (opcode & (OPERAND | FLAGS)) {
+ memcpy(&operand, &sc_pb.data[sc_pb.pc], sizeof(TscOperand));
+ sc_pb.pc += sizeof(TscOperand);
+ }
+#ifdef SCDEBUG
+ xPrintCode(opcode);
+ if ((opcode & FLAGS) && (opcode & OPERAND))
+ xPrintFlags(operand);
+ else if (opcode & OPERAND)
+ xPrintNum(operand);
+ printf("\n");
+ fflush(stdout);
+#endif
+#ifdef STACK_TRACE
+ {
+ register i;
+
+ printf("Stack trace :\n");
+ for(i = 0; i < sc_pb.sp; i++) {
+ printobject(sc_pb.stack[i], stdout, 0);
+ printf("\n");
+ }
+ }
+#endif
+ switch(opcode) {
+
+ case NoArgs:
+ ret = 0;
+ if (args != NULL) {
+ err_scerrset(TypeFailure, args, "NoArgs");
+ ret = -1;
+ }
+ break;
+
+ case BufSize:
+ UnInit(self, &sc_pb);
+ return err_scerr(TwoBufSize);
+
+ case Trans:
+ ret = xTrans(self, operand, &sc_pb);
+ break;
+
+ case TTupleS:
+ ret = xTTupleS(operand, &sc_pb);
+ break;
+
+ case Unpack:
+ ret = xUnpack(operand, &sc_pb);
+ break;
+
+ case AilWord:
+ ret = xAilword(operand, &sc_pb);
+ break;
+
+ case StringS:
+ ret = xStringS(&sc_pb);
+ break;
+
+ case ListS:
+ ret = xListS(&sc_pb);
+ break;
+
+ case PutFS:
+ ret = xPutFS(operand, &sc_pb);
+ break;
+
+ case TStringSeq:
+ ret = xTStringSeq(operand, &sc_pb);
+ break;
+
+ case TStringSlt:
+ ret = xTStringSlt(operand, &sc_pb);
+ break;
+
+ case PutVS:
+ ret = xPutVS(&sc_pb);
+ break;
+
+ case TListSeq:
+ ret = xTListSeq(operand, &sc_pb);
+ break;
+
+ case TListSlt:
+
+ret = xTListSlt(operand, &sc_pb);
+ break;
+
+ case LoopPut:
+ ret = xLoopPut(operand, &sc_pb);
+ break;
+
+ case EndLoop:
+ ret = xEndLoop(operand, &sc_pb);
+ break;
+
+ case PutI:
+ ret = xPutI(operand, &sc_pb);
+ break;
+
+ case PutC:
+ ret = xPutC(&sc_pb);
+ break;
+
+ case Dup:
+ ret = xDup(operand, &sc_pb);
+ break;
+
+ case Pop:
+ ret = xPop(operand, &sc_pb);
+ break;
+
+ case Align:
+ ret = xAlign(operand, &sc_pb);
+ break;
+
+ case Pack:
+ ret = xPack(operand, &sc_pb);
+ break;
+
+ case GetVS:
+ ret = xGetVS(&sc_pb);
+ break;
+
+ case LoopGet:
+ ret = xLoopGet(operand, &sc_pb);
+ break;
+
+ case GetFS:
+ ret = xGetFS(operand, &sc_pb);
+ break;
+
+ case GetI:
+ ret = xGetI(operand, &sc_pb);
+ break;
+
+ case GetC:
+ ret = xGetC(operand, &sc_pb);
+ break;
+
+ case PushI:
+ {
+ object *element;
+
+ element = newintobject((long)operand);
+ if (element == NULL) {
+ UnInit(self, &sc_pb);
+ return NULL;
+ }
+ ret = xPush(element, &sc_pb);
+ if (ret == 0)
+ DECREF(element);
+ }
+ break;
+
+ case Equal:
+ ret = xEqual(&sc_pb);
+ break;
+
+ default:
+ {
+ char errstr[256];
+
+ UnInit(self, &sc_pb);
+ sprintf(errstr, "Unknow stubcode %d", opcode);
+ err_setstr(RuntimeError, errstr);
+ return NULL;
+ }
+ }
+ if (ret != 0) {
+ UnInit(self, &sc_pb);
+ return NULL;
+ }
+ }
+ if (sc_pb.sp > 0) {
+ INCREF(sc_pb.stack[sc_pb.sp - 1]);
+ returnobject = sc_pb.stack[sc_pb.sp - 1];
+ } else {
+ INCREF(None);
+ returnobject = None;
+ }
+ UnInit(self, &sc_pb);
+ return returnobject;
+}