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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:14:06 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:14:06 +0000
commiteee068778cb28ecf3c14e1bf843a95547d72c42d (patch)
tree0e07b30ddc5ea579d682d5dbe57998200d1c9ab7 /tests/gpgscm/scheme.c
parentInitial commit. (diff)
downloadgnupg2-upstream.tar.xz
gnupg2-upstream.zip
Adding upstream version 2.2.40.upstream/2.2.40upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/gpgscm/scheme.c')
-rw-r--r--tests/gpgscm/scheme.c6043
1 files changed, 6043 insertions, 0 deletions
diff --git a/tests/gpgscm/scheme.c b/tests/gpgscm/scheme.c
new file mode 100644
index 0000000..86d70b3
--- /dev/null
+++ b/tests/gpgscm/scheme.c
@@ -0,0 +1,6043 @@
+/* T I N Y S C H E M E 1 . 4 1
+ * Dimitrios Souflis (dsouflis@acm.org)
+ * Based on MiniScheme (original credits follow)
+ * (MINISCM) coded by Atsushi Moriwaki (11/5/1989)
+ * (MINISCM) E-MAIL : moriwaki@kurims.kurims.kyoto-u.ac.jp
+ * (MINISCM) This version has been modified by R.C. Secrist.
+ * (MINISCM)
+ * (MINISCM) Mini-Scheme is now maintained by Akira KIDA.
+ * (MINISCM)
+ * (MINISCM) This is a revised and modified version by Akira KIDA.
+ * (MINISCM) current version is 0.85k4 (15 May 1994)
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#define _SCHEME_SOURCE
+#include "scheme-private.h"
+#ifndef WIN32
+# include <unistd.h>
+#endif
+#ifdef WIN32
+#define snprintf _snprintf
+#endif
+#if USE_DL
+# include "dynload.h"
+#endif
+#if USE_MATH
+# include <math.h>
+#endif
+
+#include <assert.h>
+#include <limits.h>
+#include <stdint.h>
+#include <float.h>
+#include <ctype.h>
+
+#if USE_STRCASECMP
+#include <strings.h>
+# ifndef __APPLE__
+# define stricmp strcasecmp
+# endif
+#endif
+
+#include "gpgrt.h" /* For GGPRT_GCC_VERSION */
+
+/* Used for documentation purposes, to signal functions in 'interface' */
+#define INTERFACE
+
+#define TOK_EOF (-1)
+#define TOK_LPAREN 0
+#define TOK_RPAREN 1
+#define TOK_DOT 2
+#define TOK_ATOM 3
+#define TOK_QUOTE 4
+#define TOK_COMMENT 5
+#define TOK_DQUOTE 6
+#define TOK_BQUOTE 7
+#define TOK_COMMA 8
+#define TOK_ATMARK 9
+#define TOK_SHARP 10
+#define TOK_SHARP_CONST 11
+#define TOK_VEC 12
+
+#define BACKQUOTE '`'
+#define DELIMITERS "()\";\f\t\v\n\r "
+
+/*
+ * Basic memory allocation units
+ */
+
+#define banner "TinyScheme 1.41"
+
+#include <string.h>
+#include <stddef.h>
+#include <stdlib.h>
+
+#ifdef __APPLE__
+static int stricmp(const char *s1, const char *s2)
+{
+ unsigned char c1, c2;
+ do {
+ c1 = tolower(*s1);
+ c2 = tolower(*s2);
+ if (c1 < c2)
+ return -1;
+ else if (c1 > c2)
+ return 1;
+ s1++, s2++;
+ } while (c1 != 0);
+ return 0;
+}
+#endif /* __APPLE__ */
+
+#if USE_STRLWR && !defined(HAVE_STRLWR)
+static const char *strlwr(char *s) {
+ const char *p=s;
+ while(*s) {
+ *s=tolower(*s);
+ s++;
+ }
+ return p;
+}
+#endif
+
+#ifndef prompt
+# define prompt "ts> "
+#endif
+
+#ifndef InitFile
+# define InitFile "init.scm"
+#endif
+
+#ifndef FIRST_CELLSEGS
+# define FIRST_CELLSEGS 3
+#endif
+
+
+
+/* All types have the LSB set. The garbage collector takes advantage
+ * of that to identify types. */
+enum scheme_types {
+ T_STRING = 1 << 1 | 1,
+ T_NUMBER = 2 << 1 | 1,
+ T_SYMBOL = 3 << 1 | 1,
+ T_PROC = 4 << 1 | 1,
+ T_PAIR = 5 << 1 | 1,
+ T_CLOSURE = 6 << 1 | 1,
+ T_CONTINUATION = 7 << 1 | 1,
+ T_FOREIGN = 8 << 1 | 1,
+ T_CHARACTER = 9 << 1 | 1,
+ T_PORT = 10 << 1 | 1,
+ T_VECTOR = 11 << 1 | 1,
+ T_MACRO = 12 << 1 | 1,
+ T_PROMISE = 13 << 1 | 1,
+ T_ENVIRONMENT = 14 << 1 | 1,
+ T_FOREIGN_OBJECT = 15 << 1 | 1,
+ T_BOOLEAN = 16 << 1 | 1,
+ T_NIL = 17 << 1 | 1,
+ T_EOF_OBJ = 18 << 1 | 1,
+ T_SINK = 19 << 1 | 1,
+ T_FRAME = 20 << 1 | 1,
+ T_LAST_SYSTEM_TYPE = 20 << 1 | 1
+};
+
+static const char *
+type_to_string (enum scheme_types typ)
+{
+ switch (typ)
+ {
+ case T_STRING: return "string";
+ case T_NUMBER: return "number";
+ case T_SYMBOL: return "symbol";
+ case T_PROC: return "proc";
+ case T_PAIR: return "pair";
+ case T_CLOSURE: return "closure";
+ case T_CONTINUATION: return "continuation";
+ case T_FOREIGN: return "foreign";
+ case T_CHARACTER: return "character";
+ case T_PORT: return "port";
+ case T_VECTOR: return "vector";
+ case T_MACRO: return "macro";
+ case T_PROMISE: return "promise";
+ case T_ENVIRONMENT: return "environment";
+ case T_FOREIGN_OBJECT: return "foreign object";
+ case T_BOOLEAN: return "boolean";
+ case T_NIL: return "nil";
+ case T_EOF_OBJ: return "eof object";
+ case T_SINK: return "sink";
+ case T_FRAME: return "frame";
+ }
+ assert (! "not reached");
+ return "?";
+}
+
+/* ADJ is enough slack to align cells in a TYPE_BITS-bit boundary */
+#define TYPE_BITS 6
+#define ADJ (1 << TYPE_BITS)
+#define T_MASKTYPE (ADJ - 1)
+ /* 0000000000111111 */
+#define T_TAGGED 1024 /* 0000010000000000 */
+#define T_FINALIZE 2048 /* 0000100000000000 */
+#define T_SYNTAX 4096 /* 0001000000000000 */
+#define T_IMMUTABLE 8192 /* 0010000000000000 */
+#define T_ATOM 16384 /* 0100000000000000 */ /* only for gc */
+#define CLRATOM 49151 /* 1011111111111111 */ /* only for gc */
+#define MARK 32768 /* 1000000000000000 */
+#define UNMARK 32767 /* 0111111111111111 */
+
+
+static num num_add(num a, num b);
+static num num_mul(num a, num b);
+static num num_div(num a, num b);
+static num num_intdiv(num a, num b);
+static num num_sub(num a, num b);
+static num num_rem(num a, num b);
+static num num_mod(num a, num b);
+static int num_eq(num a, num b);
+static int num_gt(num a, num b);
+static int num_ge(num a, num b);
+static int num_lt(num a, num b);
+static int num_le(num a, num b);
+
+#if USE_MATH
+static double round_per_R5RS(double x);
+#endif
+static int is_zero_double(double x);
+static INLINE int num_is_integer(pointer p) {
+ return ((p)->_object._number.is_fixnum);
+}
+
+static const struct num num_zero = { 1, {0} };
+static const struct num num_one = { 1, {1} };
+
+/* macros for cell operations */
+#define typeflag(p) ((p)->_flag)
+#define type(p) (typeflag(p)&T_MASKTYPE)
+#define settype(p, typ) (typeflag(p) = (typeflag(p) & ~T_MASKTYPE) | (typ))
+
+INTERFACE INLINE int is_string(pointer p) { return (type(p)==T_STRING); }
+#define strvalue(p) ((p)->_object._string._svalue)
+#define strlength(p) ((p)->_object._string._length)
+
+INTERFACE static int is_list(scheme *sc, pointer p);
+INTERFACE INLINE int is_vector(pointer p) { return (type(p)==T_VECTOR); }
+/* Given a vector, return it's length. */
+#define vector_length(v) (v)->_object._vector._length
+/* Given a vector length, compute the amount of cells required to
+ * represent it. */
+#define vector_size(len) (1 + ((len) - 1 + 2) / 3)
+INTERFACE static void fill_vector(pointer vec, pointer obj);
+INTERFACE static pointer *vector_elem_slot(pointer vec, int ielem);
+INTERFACE static pointer vector_elem(pointer vec, int ielem);
+INTERFACE static pointer set_vector_elem(pointer vec, int ielem, pointer a);
+INTERFACE INLINE int is_number(pointer p) { return (type(p)==T_NUMBER); }
+INTERFACE INLINE int is_integer(pointer p) {
+ if (!is_number(p))
+ return 0;
+ if (num_is_integer(p) || (double)ivalue(p) == rvalue(p))
+ return 1;
+ return 0;
+}
+
+INTERFACE INLINE int is_real(pointer p) {
+ return is_number(p) && (!(p)->_object._number.is_fixnum);
+}
+
+INTERFACE INLINE int is_character(pointer p) { return (type(p)==T_CHARACTER); }
+INTERFACE INLINE char *string_value(pointer p) { return strvalue(p); }
+INLINE num nvalue(pointer p) { return ((p)->_object._number); }
+INTERFACE long ivalue(pointer p) { return (num_is_integer(p)?(p)->_object._number.value.ivalue:(long)(p)->_object._number.value.rvalue); }
+INTERFACE double rvalue(pointer p) { return (!num_is_integer(p)?(p)->_object._number.value.rvalue:(double)(p)->_object._number.value.ivalue); }
+#define ivalue_unchecked(p) ((p)->_object._number.value.ivalue)
+#define rvalue_unchecked(p) ((p)->_object._number.value.rvalue)
+#define set_num_integer(p) (p)->_object._number.is_fixnum=1;
+#define set_num_real(p) (p)->_object._number.is_fixnum=0;
+INTERFACE long charvalue(pointer p) { return ivalue_unchecked(p); }
+
+INTERFACE INLINE int is_port(pointer p) { return (type(p)==T_PORT); }
+INTERFACE INLINE int is_inport(pointer p) { return is_port(p) && p->_object._port->kind & port_input; }
+INTERFACE INLINE int is_outport(pointer p) { return is_port(p) && p->_object._port->kind & port_output; }
+
+INTERFACE INLINE int is_pair(pointer p) { return (type(p)==T_PAIR); }
+#define car(p) ((p)->_object._cons._car)
+#define cdr(p) ((p)->_object._cons._cdr)
+INTERFACE pointer pair_car(pointer p) { return car(p); }
+INTERFACE pointer pair_cdr(pointer p) { return cdr(p); }
+INTERFACE pointer set_car(pointer p, pointer q) { return car(p)=q; }
+INTERFACE pointer set_cdr(pointer p, pointer q) { return cdr(p)=q; }
+
+INTERFACE INLINE int is_symbol(pointer p) { return (type(p)==T_SYMBOL); }
+INTERFACE INLINE char *symname(pointer p) { return strvalue(car(p)); }
+#if USE_PLIST
+SCHEME_EXPORT INLINE int hasprop(pointer p) { return (is_symbol(p)); }
+#define symprop(p) cdr(p)
+#endif
+
+INTERFACE INLINE int is_syntax(pointer p) { return (typeflag(p)&T_SYNTAX); }
+INTERFACE INLINE int is_proc(pointer p) { return (type(p)==T_PROC); }
+INTERFACE INLINE int is_foreign(pointer p) { return (type(p)==T_FOREIGN); }
+INTERFACE INLINE char *syntaxname(pointer p) { return strvalue(car(p)); }
+#define procnum(p) ivalue_unchecked(p)
+static const char *procname(pointer x);
+
+INTERFACE INLINE int is_closure(pointer p) { return (type(p)==T_CLOSURE); }
+INTERFACE INLINE int is_macro(pointer p) { return (type(p)==T_MACRO); }
+INTERFACE INLINE pointer closure_code(pointer p) { return car(p); }
+INTERFACE INLINE pointer closure_env(pointer p) { return cdr(p); }
+
+INTERFACE INLINE int is_continuation(pointer p) { return (type(p)==T_CONTINUATION); }
+#define cont_dump(p) cdr(p)
+
+INTERFACE INLINE int is_foreign_object(pointer p) { return (type(p)==T_FOREIGN_OBJECT); }
+INTERFACE const foreign_object_vtable *get_foreign_object_vtable(pointer p) {
+ return p->_object._foreign_object._vtable;
+}
+INTERFACE void *get_foreign_object_data(pointer p) {
+ return p->_object._foreign_object._data;
+}
+
+/* To do: promise should be forced ONCE only */
+INTERFACE INLINE int is_promise(pointer p) { return (type(p)==T_PROMISE); }
+
+INTERFACE INLINE int is_environment(pointer p) { return (type(p)==T_ENVIRONMENT); }
+#define setenvironment(p) typeflag(p) = T_ENVIRONMENT
+
+INTERFACE INLINE int is_frame(pointer p) { return (type(p) == T_FRAME); }
+#define setframe(p) settype(p, T_FRAME)
+
+#define is_atom(p) (typeflag(p)&T_ATOM)
+#define setatom(p) typeflag(p) |= T_ATOM
+#define clratom(p) typeflag(p) &= CLRATOM
+
+#define is_mark(p) (typeflag(p)&MARK)
+#define setmark(p) typeflag(p) |= MARK
+#define clrmark(p) typeflag(p) &= UNMARK
+
+INTERFACE INLINE int is_immutable(pointer p) { return (typeflag(p)&T_IMMUTABLE); }
+/*#define setimmutable(p) typeflag(p) |= T_IMMUTABLE*/
+INTERFACE INLINE void setimmutable(pointer p) { typeflag(p) |= T_IMMUTABLE; }
+
+#define caar(p) car(car(p))
+#define cadr(p) car(cdr(p))
+#define cdar(p) cdr(car(p))
+#define cddr(p) cdr(cdr(p))
+#define cadar(p) car(cdr(car(p)))
+#define caddr(p) car(cdr(cdr(p)))
+#define cdaar(p) cdr(car(car(p)))
+#define cadaar(p) car(cdr(car(car(p))))
+#define cadddr(p) car(cdr(cdr(cdr(p))))
+#define cddddr(p) cdr(cdr(cdr(cdr(p))))
+
+#if USE_HISTORY
+static pointer history_flatten(scheme *sc);
+static void history_mark(scheme *sc);
+#else
+# define history_mark(SC) (void) 0
+# define history_flatten(SC) (SC)->NIL
+#endif
+
+#if USE_CHAR_CLASSIFIERS
+static INLINE int Cisalpha(int c) { return isascii(c) && isalpha(c); }
+static INLINE int Cisdigit(int c) { return isascii(c) && isdigit(c); }
+static INLINE int Cisspace(int c) { return isascii(c) && isspace(c); }
+static INLINE int Cisupper(int c) { return isascii(c) && isupper(c); }
+static INLINE int Cislower(int c) { return isascii(c) && islower(c); }
+#endif
+
+#if USE_ASCII_NAMES
+static const char charnames[32][3]={
+ "nul",
+ "soh",
+ "stx",
+ "etx",
+ "eot",
+ "enq",
+ "ack",
+ "bel",
+ "bs",
+ "ht",
+ "lf",
+ "vt",
+ "ff",
+ "cr",
+ "so",
+ "si",
+ "dle",
+ "dc1",
+ "dc2",
+ "dc3",
+ "dc4",
+ "nak",
+ "syn",
+ "etb",
+ "can",
+ "em",
+ "sub",
+ "esc",
+ "fs",
+ "gs",
+ "rs",
+ "us"
+};
+
+static int is_ascii_name(const char *name, int *pc) {
+ int i;
+ for(i=0; i<32; i++) {
+ if (strncasecmp(name, charnames[i], 3) == 0) {
+ *pc=i;
+ return 1;
+ }
+ }
+ if (strcasecmp(name, "del") == 0) {
+ *pc=127;
+ return 1;
+ }
+ return 0;
+}
+
+#endif
+
+static int file_push(scheme *sc, pointer fname);
+static void file_pop(scheme *sc);
+static int file_interactive(scheme *sc);
+static INLINE int is_one_of(char *s, int c);
+static int alloc_cellseg(scheme *sc, int n);
+static long binary_decode(const char *s);
+static INLINE pointer get_cell(scheme *sc, pointer a, pointer b);
+static pointer _get_cell(scheme *sc, pointer a, pointer b);
+static pointer reserve_cells(scheme *sc, int n);
+static pointer get_consecutive_cells(scheme *sc, int n);
+static pointer find_consecutive_cells(scheme *sc, int n);
+static int finalize_cell(scheme *sc, pointer a);
+static int count_consecutive_cells(pointer x, int needed);
+static pointer find_slot_in_env(scheme *sc, pointer env, pointer sym, int all);
+static pointer mk_number(scheme *sc, num n);
+static char *store_string(scheme *sc, int len, const char *str, char fill);
+static pointer mk_vector(scheme *sc, int len);
+static pointer mk_atom(scheme *sc, char *q);
+static pointer mk_sharp_const(scheme *sc, char *name);
+static pointer mk_port(scheme *sc, port *p);
+static pointer port_from_filename(scheme *sc, const char *fn, int prop);
+static pointer port_from_file(scheme *sc, FILE *, int prop);
+static pointer port_from_string(scheme *sc, char *start, char *past_the_end, int prop);
+static port *port_rep_from_filename(scheme *sc, const char *fn, int prop);
+static port *port_rep_from_file(scheme *sc, FILE *, int prop);
+static port *port_rep_from_string(scheme *sc, char *start, char *past_the_end, int prop);
+static void port_close(scheme *sc, pointer p, int flag);
+static void mark(pointer a);
+static void gc(scheme *sc, pointer a, pointer b);
+static int basic_inchar(port *pt);
+static int inchar(scheme *sc);
+static void backchar(scheme *sc, int c);
+static char *readstr_upto(scheme *sc, char *delim);
+static pointer readstrexp(scheme *sc);
+static INLINE int skipspace(scheme *sc);
+static int token(scheme *sc);
+static void printslashstring(scheme *sc, char *s, int len);
+static void atom2str(scheme *sc, pointer l, int f, char **pp, int *plen);
+static void printatom(scheme *sc, pointer l, int f);
+static pointer mk_proc(scheme *sc, enum scheme_opcodes op);
+static pointer mk_closure(scheme *sc, pointer c, pointer e);
+static pointer mk_continuation(scheme *sc, pointer d);
+static pointer reverse(scheme *sc, pointer term, pointer list);
+static pointer reverse_in_place(scheme *sc, pointer term, pointer list);
+static pointer revappend(scheme *sc, pointer a, pointer b);
+static void dump_stack_preallocate_frame(scheme *sc);
+static void dump_stack_mark(scheme *);
+struct op_code_info {
+ char name[31]; /* strlen ("call-with-current-continuation") + 1 */
+ unsigned char min_arity;
+ unsigned char max_arity;
+ char arg_tests_encoding[3];
+};
+static const struct op_code_info dispatch_table[];
+static int check_arguments (scheme *sc, const struct op_code_info *pcd, char *msg, size_t msg_size);
+static void Eval_Cycle(scheme *sc, enum scheme_opcodes op);
+static void assign_syntax(scheme *sc, enum scheme_opcodes op, char *name);
+static int syntaxnum(scheme *sc, pointer p);
+static void assign_proc(scheme *sc, enum scheme_opcodes, const char *name);
+
+#define num_ivalue(n) (n.is_fixnum?(n).value.ivalue:(long)(n).value.rvalue)
+#define num_rvalue(n) (!n.is_fixnum?(n).value.rvalue:(double)(n).value.ivalue)
+
+static num num_add(num a, num b) {
+ num ret;
+ ret.is_fixnum=a.is_fixnum && b.is_fixnum;
+ if(ret.is_fixnum) {
+ ret.value.ivalue= a.value.ivalue+b.value.ivalue;
+ } else {
+ ret.value.rvalue=num_rvalue(a)+num_rvalue(b);
+ }
+ return ret;
+}
+
+static num num_mul(num a, num b) {
+ num ret;
+ ret.is_fixnum=a.is_fixnum && b.is_fixnum;
+ if(ret.is_fixnum) {
+ ret.value.ivalue= a.value.ivalue*b.value.ivalue;
+ } else {
+ ret.value.rvalue=num_rvalue(a)*num_rvalue(b);
+ }
+ return ret;
+}
+
+static num num_div(num a, num b) {
+ num ret;
+ ret.is_fixnum=a.is_fixnum && b.is_fixnum && a.value.ivalue%b.value.ivalue==0;
+ if(ret.is_fixnum) {
+ ret.value.ivalue= a.value.ivalue/b.value.ivalue;
+ } else {
+ ret.value.rvalue=num_rvalue(a)/num_rvalue(b);
+ }
+ return ret;
+}
+
+static num num_intdiv(num a, num b) {
+ num ret;
+ ret.is_fixnum=a.is_fixnum && b.is_fixnum;
+ if(ret.is_fixnum) {
+ ret.value.ivalue= a.value.ivalue/b.value.ivalue;
+ } else {
+ ret.value.rvalue=num_rvalue(a)/num_rvalue(b);
+ }
+ return ret;
+}
+
+static num num_sub(num a, num b) {
+ num ret;
+ ret.is_fixnum=a.is_fixnum && b.is_fixnum;
+ if(ret.is_fixnum) {
+ ret.value.ivalue= a.value.ivalue-b.value.ivalue;
+ } else {
+ ret.value.rvalue=num_rvalue(a)-num_rvalue(b);
+ }
+ return ret;
+}
+
+static num num_rem(num a, num b) {
+ num ret;
+ long e1, e2, res;
+ ret.is_fixnum=a.is_fixnum && b.is_fixnum;
+ e1=num_ivalue(a);
+ e2=num_ivalue(b);
+ res=e1%e2;
+ /* remainder should have same sign as second operand */
+ if (res > 0) {
+ if (e1 < 0) {
+ res -= labs(e2);
+ }
+ } else if (res < 0) {
+ if (e1 > 0) {
+ res += labs(e2);
+ }
+ }
+ ret.value.ivalue=res;
+ return ret;
+}
+
+static num num_mod(num a, num b) {
+ num ret;
+ long e1, e2, res;
+ ret.is_fixnum=a.is_fixnum && b.is_fixnum;
+ e1=num_ivalue(a);
+ e2=num_ivalue(b);
+ res=e1%e2;
+ /* modulo should have same sign as second operand */
+ if (res * e2 < 0) {
+ res += e2;
+ }
+ ret.value.ivalue=res;
+ return ret;
+}
+
+static int num_eq(num a, num b) {
+ int ret;
+ int is_fixnum=a.is_fixnum && b.is_fixnum;
+ if(is_fixnum) {
+ ret= a.value.ivalue==b.value.ivalue;
+ } else {
+ ret=num_rvalue(a)==num_rvalue(b);
+ }
+ return ret;
+}
+
+
+static int num_gt(num a, num b) {
+ int ret;
+ int is_fixnum=a.is_fixnum && b.is_fixnum;
+ if(is_fixnum) {
+ ret= a.value.ivalue>b.value.ivalue;
+ } else {
+ ret=num_rvalue(a)>num_rvalue(b);
+ }
+ return ret;
+}
+
+static int num_ge(num a, num b) {
+ return !num_lt(a,b);
+}
+
+static int num_lt(num a, num b) {
+ int ret;
+ int is_fixnum=a.is_fixnum && b.is_fixnum;
+ if(is_fixnum) {
+ ret= a.value.ivalue<b.value.ivalue;
+ } else {
+ ret=num_rvalue(a)<num_rvalue(b);
+ }
+ return ret;
+}
+
+static int num_le(num a, num b) {
+ return !num_gt(a,b);
+}
+
+#if USE_MATH
+/* Round to nearest. Round to even if midway */
+static double round_per_R5RS(double x) {
+ double fl=floor(x);
+ double ce=ceil(x);
+ double dfl=x-fl;
+ double dce=ce-x;
+ if(dfl>dce) {
+ return ce;
+ } else if(dfl<dce) {
+ return fl;
+ } else {
+ if(fmod(fl,2.0)==0.0) { /* I imagine this holds */
+ return fl;
+ } else {
+ return ce;
+ }
+ }
+}
+#endif
+
+static int is_zero_double(double x) {
+ return x<DBL_MIN && x>-DBL_MIN;
+}
+
+static long binary_decode(const char *s) {
+ long x=0;
+
+ while(*s!=0 && (*s=='1' || *s=='0')) {
+ x<<=1;
+ x+=*s-'0';
+ s++;
+ }
+
+ return x;
+}
+
+
+
+/*
+ * Copying values.
+ *
+ * Occasionally, we need to copy a value from one location in the
+ * storage to another. Scheme objects are fine. Some primitive
+ * objects, however, require finalization, usually to free resources.
+ *
+ * For these values, we either make a copy or acquire a reference.
+ */
+
+/*
+ * Copy SRC to DST.
+ *
+ * Copies the representation of SRC to DST. This makes SRC
+ * indistinguishable from DST from the perspective of a Scheme
+ * expression modulo the fact that they reside at a different location
+ * in the store.
+ *
+ * Conditions:
+ *
+ * - SRC must not be a vector.
+ * - Caller must ensure that any resources associated with the
+ * value currently stored in DST is accounted for.
+ */
+static void
+copy_value(scheme *sc, pointer dst, pointer src)
+{
+ memcpy(dst, src, sizeof *src);
+
+ /* We may need to make a copy or acquire a reference. */
+ if (typeflag(dst) & T_FINALIZE)
+ switch (type(dst)) {
+ case T_STRING:
+ strvalue(dst) = store_string(sc, strlength(dst), strvalue(dst), 0);
+ break;
+ case T_PORT:
+ /* XXX acquire reference */
+ assert (!"implemented");
+ break;
+ case T_FOREIGN_OBJECT:
+ /* XXX acquire reference */
+ assert (!"implemented");
+ break;
+ case T_VECTOR:
+ assert (!"vectors cannot be copied");
+ }
+}
+
+
+
+/* Tags are like property lists, but can be attached to arbitrary
+ * values. */
+
+static pointer
+mk_tagged_value(scheme *sc, pointer v, pointer tag_car, pointer tag_cdr)
+{
+ pointer r, t;
+
+ assert(! is_vector(v));
+
+ r = get_consecutive_cells(sc, 2);
+ if (r == sc->sink)
+ return sc->sink;
+
+ copy_value(sc, r, v);
+ typeflag(r) |= T_TAGGED;
+
+ t = r + 1;
+ typeflag(t) = T_PAIR;
+ car(t) = tag_car;
+ cdr(t) = tag_cdr;
+
+ return r;
+}
+
+static INLINE int
+has_tag(pointer v)
+{
+ return !! (typeflag(v) & T_TAGGED);
+}
+
+static INLINE pointer
+get_tag(scheme *sc, pointer v)
+{
+ if (has_tag(v))
+ return v + 1;
+ return sc->NIL;
+}
+
+
+
+/* Low-level allocator.
+ *
+ * Memory is allocated in segments. Every segment holds a fixed
+ * number of cells. Segments are linked into a list, sorted in
+ * reverse address order (i.e. those with a higher address first).
+ * This is used in the garbage collector to build the freelist in
+ * address order.
+ */
+
+struct cell_segment
+{
+ struct cell_segment *next;
+ void *alloc;
+ pointer cells;
+ size_t cells_len;
+};
+
+/* Allocate a new cell segment but do not make it available yet. */
+static int
+_alloc_cellseg(scheme *sc, size_t len, struct cell_segment **segment)
+{
+ int adj = ADJ;
+ void *cp;
+
+ if (adj < sizeof(struct cell))
+ adj = sizeof(struct cell);
+
+ /* The segment header is conveniently allocated with the cells. */
+ cp = sc->malloc(sizeof **segment + len * sizeof(struct cell) + adj);
+ if (cp == NULL)
+ return 1;
+
+ *segment = cp;
+ (*segment)->next = NULL;
+ (*segment)->alloc = cp;
+ cp = (void *) ((uintptr_t) cp + sizeof **segment);
+
+ /* adjust in TYPE_BITS-bit boundary */
+ if (((uintptr_t) cp) % adj != 0)
+ cp = (void *) (adj * ((uintptr_t) cp / adj + 1));
+
+ (*segment)->cells = cp;
+ (*segment)->cells_len = len;
+ return 0;
+}
+
+/* Deallocate a cell segment. Returns the next cell segment.
+ * Convenient for deallocation in a loop. */
+static struct cell_segment *
+_dealloc_cellseg(scheme *sc, struct cell_segment *segment)
+{
+
+ struct cell_segment *next;
+
+ if (segment == NULL)
+ return NULL;
+
+ next = segment->next;
+ sc->free(segment->alloc);
+ return next;
+}
+
+/* allocate new cell segment */
+static int alloc_cellseg(scheme *sc, int n) {
+ pointer last;
+ pointer p;
+ int k;
+
+ for (k = 0; k < n; k++) {
+ struct cell_segment *new, **s;
+ if (_alloc_cellseg(sc, CELL_SEGSIZE, &new)) {
+ return k;
+ }
+ /* insert new segment in reverse address order */
+ for (s = &sc->cell_segments;
+ *s && (uintptr_t) (*s)->alloc > (uintptr_t) new->alloc;
+ s = &(*s)->next) {
+ /* walk */
+ }
+ new->next = *s;
+ *s = new;
+
+ sc->fcells += new->cells_len;
+ last = new->cells + new->cells_len - 1;
+ for (p = new->cells; p <= last; p++) {
+ typeflag(p) = 0;
+ cdr(p) = p + 1;
+ car(p) = sc->NIL;
+ }
+ /* insert new cells in address order on free list */
+ if (sc->free_cell == sc->NIL || p < sc->free_cell) {
+ cdr(last) = sc->free_cell;
+ sc->free_cell = new->cells;
+ } else {
+ p = sc->free_cell;
+ while (cdr(p) != sc->NIL && (uintptr_t) new->cells > (uintptr_t) cdr(p))
+ p = cdr(p);
+ cdr(last) = cdr(p);
+ cdr(p) = new->cells;
+ }
+ }
+ return n;
+}
+
+
+
+/* Controlling the garbage collector.
+ *
+ * Every time a cell is allocated, the interpreter may run out of free
+ * cells and do a garbage collection. This is problematic because it
+ * might garbage collect objects that have been allocated, but are not
+ * yet made available to the interpreter.
+ *
+ * Previously, we would plug such newly allocated cells into the list
+ * of newly allocated objects rooted at car(sc->sink), but that
+ * requires allocating yet another cell increasing pressure on the
+ * memory management system.
+ *
+ * A faster alternative is to preallocate the cells needed for an
+ * operation and make sure the garbage collection is not run until all
+ * allocated objects are plugged in. This can be done with gc_disable
+ * and gc_enable.
+ */
+
+/* The garbage collector is enabled if the inhibit counter is
+ * zero. */
+#define GC_ENABLED 0
+
+/* For now we provide a way to disable this optimization for
+ * benchmarking and because it produces slightly smaller code. */
+#ifndef USE_GC_LOCKING
+# define USE_GC_LOCKING 1
+#endif
+
+/* To facilitate nested calls to gc_disable, functions that allocate
+ * more than one cell may define a macro, e.g. foo_allocates. This
+ * macro can be used to compute the amount of preallocation at the
+ * call site with the help of this macro. */
+#define gc_reservations(fn) fn ## _allocates
+
+#if USE_GC_LOCKING
+
+/* Report a shortage in reserved cells, and terminate the program. */
+static void
+gc_reservation_failure(struct scheme *sc)
+{
+#ifdef NDEBUG
+ fprintf(stderr,
+ "insufficient reservation\n");
+#else
+ fprintf(stderr,
+ "insufficient %s reservation in line %d\n",
+ sc->frame_freelist == sc->NIL ? "frame" : "cell",
+ sc->reserved_lineno);
+#endif
+ abort();
+}
+
+/* Disable the garbage collection and reserve the given number of
+ * cells. gc_disable may be nested, but the enclosing reservation
+ * must include the reservations of all nested calls. Note: You must
+ * re-enable the gc before calling Error_X. */
+static void
+_gc_disable(struct scheme *sc, size_t reserve, int lineno)
+{
+ if (sc->inhibit_gc == 0) {
+ reserve_cells(sc, (reserve));
+ sc->reserved_cells = (reserve);
+#ifdef NDEBUG
+ (void) lineno;
+#else
+ sc->reserved_lineno = lineno;
+#endif
+ } else if (sc->reserved_cells < (reserve))
+ gc_reservation_failure (sc);
+ sc->inhibit_gc += 1;
+}
+#define gc_disable(sc, reserve) \
+ do { \
+ if (sc->frame_freelist == sc->NIL) { \
+ if (gc_enabled(sc)) \
+ dump_stack_preallocate_frame(sc); \
+ else \
+ gc_reservation_failure(sc); \
+ } \
+ _gc_disable (sc, reserve, __LINE__); \
+ } while (0)
+
+/* Enable the garbage collector. */
+#define gc_enable(sc) \
+ do { \
+ assert(sc->inhibit_gc); \
+ sc->inhibit_gc -= 1; \
+ } while (0)
+
+/* Test whether the garbage collector is enabled. */
+#define gc_enabled(sc) \
+ (sc->inhibit_gc == GC_ENABLED)
+
+/* Consume a reserved cell. */
+#define gc_consume(sc) \
+ do { \
+ assert(! gc_enabled (sc)); \
+ if (sc->reserved_cells == 0) \
+ gc_reservation_failure (sc); \
+ sc->reserved_cells -= 1; \
+ } while (0)
+
+#else /* USE_GC_LOCKING */
+
+#define gc_reservation_failure(sc) (void) 0
+#define gc_disable(sc, reserve) \
+ do { \
+ if (sc->frame_freelist == sc->NIL) \
+ dump_stack_preallocate_frame(sc); \
+ } while (0)
+#define gc_enable(sc) (void) 0
+#define gc_enabled(sc) 1
+#define gc_consume(sc) (void) 0
+
+#endif /* USE_GC_LOCKING */
+
+static INLINE pointer get_cell_x(scheme *sc, pointer a, pointer b) {
+ if (! gc_enabled (sc) || sc->free_cell != sc->NIL) {
+ pointer x = sc->free_cell;
+ if (! gc_enabled (sc))
+ gc_consume (sc);
+ sc->free_cell = cdr(x);
+ --sc->fcells;
+ return (x);
+ }
+ assert (gc_enabled (sc));
+ return _get_cell (sc, a, b);
+}
+
+
+/* get new cell. parameter a, b is marked by gc. */
+static pointer _get_cell(scheme *sc, pointer a, pointer b) {
+ pointer x;
+
+ if(sc->no_memory) {
+ return sc->sink;
+ }
+
+ assert (gc_enabled (sc));
+ if (sc->free_cell == sc->NIL) {
+ gc(sc,a, b);
+ if (sc->free_cell == sc->NIL) {
+ sc->no_memory=1;
+ return sc->sink;
+ }
+ }
+ x = sc->free_cell;
+ sc->free_cell = cdr(x);
+ --sc->fcells;
+ return (x);
+}
+
+/* make sure that there is a given number of cells free */
+static pointer reserve_cells(scheme *sc, int n) {
+ if(sc->no_memory) {
+ return sc->NIL;
+ }
+
+ /* Are there enough cells available? */
+ if (sc->fcells < n) {
+ /* If not, try gc'ing some */
+ gc(sc, sc->NIL, sc->NIL);
+ if (sc->fcells < n) {
+ /* If there still aren't, try getting more heap */
+ if (!alloc_cellseg(sc,1)) {
+ sc->no_memory=1;
+ return sc->NIL;
+ }
+ }
+ if (sc->fcells < n) {
+ /* If all fail, report failure */
+ sc->no_memory=1;
+ return sc->NIL;
+ }
+ }
+ return (sc->T);
+}
+
+static pointer get_consecutive_cells(scheme *sc, int n) {
+ pointer x;
+
+ if(sc->no_memory) { return sc->sink; }
+
+ /* Are there any cells available? */
+ x=find_consecutive_cells(sc,n);
+ if (x != sc->NIL) { return x; }
+
+ /* If not, try gc'ing some */
+ gc(sc, sc->NIL, sc->NIL);
+ x=find_consecutive_cells(sc,n);
+ if (x != sc->NIL) { return x; }
+
+ /* If there still aren't, try getting more heap */
+ if (!alloc_cellseg(sc,1))
+ {
+ sc->no_memory=1;
+ return sc->sink;
+ }
+
+ x=find_consecutive_cells(sc,n);
+ if (x != sc->NIL) { return x; }
+
+ /* If all fail, report failure */
+ sc->no_memory=1;
+ return sc->sink;
+}
+
+static int count_consecutive_cells(pointer x, int needed) {
+ int n=1;
+ while(cdr(x)==x+1) {
+ x=cdr(x);
+ n++;
+ if(n>needed) return n;
+ }
+ return n;
+}
+
+static pointer find_consecutive_cells(scheme *sc, int n) {
+ pointer *pp;
+ int cnt;
+
+ pp=&sc->free_cell;
+ while(*pp!=sc->NIL) {
+ cnt=count_consecutive_cells(*pp,n);
+ if(cnt>=n) {
+ pointer x=*pp;
+ *pp=cdr(*pp+n-1);
+ sc->fcells -= n;
+ return x;
+ }
+ pp=&cdr(*pp+cnt-1);
+ }
+ return sc->NIL;
+}
+
+/* Free a cell. This is dangerous. Only free cells that are not
+ * referenced. */
+static INLINE void
+free_cell(scheme *sc, pointer a)
+{
+ cdr(a) = sc->free_cell;
+ sc->free_cell = a;
+ sc->fcells += 1;
+}
+
+/* Free a cell and retrieve its content. This is dangerous. Only
+ * free cells that are not referenced. */
+static INLINE void
+free_cons(scheme *sc, pointer a, pointer *r_car, pointer *r_cdr)
+{
+ *r_car = car(a);
+ *r_cdr = cdr(a);
+ free_cell(sc, a);
+}
+
+/* To retain recent allocs before interpreter knows about them -
+ Tehom */
+
+static void push_recent_alloc(scheme *sc, pointer recent, pointer extra)
+{
+ pointer holder = get_cell_x(sc, recent, extra);
+ typeflag(holder) = T_PAIR | T_IMMUTABLE;
+ car(holder) = recent;
+ cdr(holder) = car(sc->sink);
+ car(sc->sink) = holder;
+}
+
+static INLINE void ok_to_freely_gc(scheme *sc)
+{
+ pointer a = car(sc->sink), next;
+ car(sc->sink) = sc->NIL;
+ while (a != sc->NIL)
+ {
+ next = cdr(a);
+ free_cell(sc, a);
+ a = next;
+ }
+}
+
+static pointer get_cell(scheme *sc, pointer a, pointer b)
+{
+ pointer cell = get_cell_x(sc, a, b);
+ /* For right now, include "a" and "b" in "cell" so that gc doesn't
+ think they are garbage. */
+ /* Tentatively record it as a pair so gc understands it. */
+ typeflag(cell) = T_PAIR;
+ car(cell) = a;
+ cdr(cell) = b;
+ if (gc_enabled (sc))
+ push_recent_alloc(sc, cell, sc->NIL);
+ return cell;
+}
+
+static pointer get_vector_object(scheme *sc, int len, pointer init)
+{
+ pointer cells = get_consecutive_cells(sc, vector_size(len));
+ int i;
+ int alloc_len = 1 + 3 * (vector_size(len) - 1);
+ if(sc->no_memory) { return sc->sink; }
+ /* Record it as a vector so that gc understands it. */
+ typeflag(cells) = (T_VECTOR | T_ATOM | T_FINALIZE);
+ vector_length(cells) = len;
+ fill_vector(cells,init);
+
+ /* Initialize the unused slots at the end. */
+ assert (alloc_len - len < 3);
+ for (i = len; i < alloc_len; i++)
+ cells->_object._vector._elements[i] = sc->NIL;
+
+ if (gc_enabled (sc))
+ push_recent_alloc(sc, cells, sc->NIL);
+ return cells;
+}
+
+/* Medium level cell allocation */
+
+/* get new cons cell */
+pointer _cons(scheme *sc, pointer a, pointer b, int immutable) {
+ pointer x = get_cell(sc,a, b);
+
+ typeflag(x) = T_PAIR;
+ if(immutable) {
+ setimmutable(x);
+ }
+ car(x) = a;
+ cdr(x) = b;
+ return (x);
+}
+
+
+/* ========== oblist implementation ========== */
+
+#ifndef USE_OBJECT_LIST
+
+static int hash_fn(const char *key, int table_size);
+
+static pointer oblist_initial_value(scheme *sc)
+{
+ /* There are about 768 symbols used after loading the
+ * interpreter. */
+ return mk_vector(sc, 1009);
+}
+
+/* Lookup the symbol NAME. Returns the symbol, or NIL if it does not
+ * exist. In that case, SLOT points to the point where the new symbol
+ * is to be inserted. */
+static INLINE pointer
+oblist_find_by_name(scheme *sc, const char *name, pointer **slot)
+{
+ int location;
+ pointer x;
+ char *s;
+ int d;
+
+ location = hash_fn(name, vector_length(sc->oblist));
+ for (*slot = vector_elem_slot(sc->oblist, location), x = **slot;
+ x != sc->NIL; *slot = &cdr(x), x = **slot) {
+ s = symname(car(x));
+ /* case-insensitive, per R5RS section 2. */
+ d = stricmp(name, s);
+ if (d == 0)
+ return car(x); /* Hit. */
+ else if (d > 0)
+ break; /* Miss. */
+ }
+ return sc->NIL;
+}
+
+static pointer oblist_all_symbols(scheme *sc)
+{
+ int i;
+ pointer x;
+ pointer ob_list = sc->NIL;
+
+ for (i = 0; i < vector_length(sc->oblist); i++) {
+ for (x = vector_elem(sc->oblist, i); x != sc->NIL; x = cdr(x)) {
+ ob_list = cons(sc, x, ob_list);
+ }
+ }
+ return ob_list;
+}
+
+#else
+
+static pointer oblist_initial_value(scheme *sc)
+{
+ return sc->NIL;
+}
+
+/* Lookup the symbol NAME. Returns the symbol, or NIL if it does not
+ * exist. In that case, SLOT points to the point where the new symbol
+ * is to be inserted. */
+static INLINE pointer
+oblist_find_by_name(scheme *sc, const char *name, pointer **slot)
+{
+ pointer x;
+ char *s;
+ int d;
+
+ for (*slot = &sc->oblist, x = **slot; x != sc->NIL; *slot = &cdr(x), x = **slot) {
+ s = symname(car(x));
+ /* case-insensitive, per R5RS section 2. */
+ d = stricmp(name, s);
+ if (d == 0)
+ return car(x); /* Hit. */
+ else if (d > 0)
+ break; /* Miss. */
+ }
+ return sc->NIL;
+}
+
+static pointer oblist_all_symbols(scheme *sc)
+{
+ return sc->oblist;
+}
+
+#endif
+
+/* Add a new symbol NAME at SLOT. SLOT must be obtained using
+ * oblist_find_by_name, and no insertion must be done between
+ * obtaining the SLOT and calling this function. Returns the new
+ * symbol. */
+static pointer oblist_add_by_name(scheme *sc, const char *name, pointer *slot)
+{
+#define oblist_add_by_name_allocates 3
+ pointer x;
+
+ gc_disable(sc, gc_reservations (oblist_add_by_name));
+ x = immutable_cons(sc, mk_string(sc, name), sc->NIL);
+ typeflag(x) = T_SYMBOL;
+ setimmutable(car(x));
+ *slot = immutable_cons(sc, x, *slot);
+ gc_enable(sc);
+ return x;
+}
+
+
+
+static pointer mk_port(scheme *sc, port *p) {
+ pointer x = get_cell(sc, sc->NIL, sc->NIL);
+
+ typeflag(x) = T_PORT|T_ATOM|T_FINALIZE;
+ x->_object._port=p;
+ return (x);
+}
+
+pointer mk_foreign_func(scheme *sc, foreign_func f) {
+ pointer x = get_cell(sc, sc->NIL, sc->NIL);
+
+ typeflag(x) = (T_FOREIGN | T_ATOM);
+ x->_object._ff=f;
+ return (x);
+}
+
+pointer mk_foreign_object(scheme *sc, const foreign_object_vtable *vtable, void *data) {
+ pointer x = get_cell(sc, sc->NIL, sc->NIL);
+
+ typeflag(x) = (T_FOREIGN_OBJECT | T_ATOM | T_FINALIZE);
+ x->_object._foreign_object._vtable=vtable;
+ x->_object._foreign_object._data = data;
+ return (x);
+}
+
+INTERFACE pointer mk_character(scheme *sc, int c) {
+ pointer x = get_cell(sc,sc->NIL, sc->NIL);
+
+ typeflag(x) = (T_CHARACTER | T_ATOM);
+ ivalue_unchecked(x)= c;
+ set_num_integer(x);
+ return (x);
+}
+
+
+
+#if USE_SMALL_INTEGERS
+
+static const struct cell small_integers[] = {
+#define DEFINE_INTEGER(n) { T_NUMBER | T_ATOM | MARK, {{ 1, {n}}}},
+#include "small-integers.h"
+#undef DEFINE_INTEGER
+ {0}
+};
+
+#define MAX_SMALL_INTEGER (sizeof small_integers / sizeof *small_integers - 1)
+
+static INLINE pointer
+mk_small_integer(scheme *sc, long n)
+{
+#define mk_small_integer_allocates 0
+ (void) sc;
+ assert(0 <= n && n < MAX_SMALL_INTEGER);
+ return (pointer) &small_integers[n];
+}
+#else
+
+#define mk_small_integer_allocates 1
+#define mk_small_integer mk_integer
+
+#endif
+
+/* get number atom (integer) */
+INTERFACE pointer mk_integer(scheme *sc, long n) {
+ pointer x;
+
+#if USE_SMALL_INTEGERS
+ if (0 <= n && n < MAX_SMALL_INTEGER)
+ return mk_small_integer(sc, n);
+#endif
+
+ x = get_cell(sc,sc->NIL, sc->NIL);
+ typeflag(x) = (T_NUMBER | T_ATOM);
+ ivalue_unchecked(x)= n;
+ set_num_integer(x);
+ return (x);
+}
+
+
+
+INTERFACE pointer mk_real(scheme *sc, double n) {
+ pointer x = get_cell(sc,sc->NIL, sc->NIL);
+
+ typeflag(x) = (T_NUMBER | T_ATOM);
+ rvalue_unchecked(x)= n;
+ set_num_real(x);
+ return (x);
+}
+
+static pointer mk_number(scheme *sc, num n) {
+ if(n.is_fixnum) {
+ return mk_integer(sc,n.value.ivalue);
+ } else {
+ return mk_real(sc,n.value.rvalue);
+ }
+}
+
+/* allocate name to string area */
+static char *store_string(scheme *sc, int len_str, const char *str, char fill) {
+ char *q;
+
+ q=(char*)sc->malloc(len_str+1);
+ if(q==0) {
+ sc->no_memory=1;
+ return sc->strbuff;
+ }
+ if(str!=0) {
+ memcpy (q, str, len_str);
+ q[len_str]=0;
+ } else {
+ memset(q, fill, len_str);
+ q[len_str]=0;
+ }
+ return (q);
+}
+
+/* get new string */
+INTERFACE pointer mk_string(scheme *sc, const char *str) {
+ return mk_counted_string(sc,str,strlen(str));
+}
+
+INTERFACE pointer mk_counted_string(scheme *sc, const char *str, int len) {
+ pointer x = get_cell(sc, sc->NIL, sc->NIL);
+ typeflag(x) = (T_STRING | T_ATOM | T_FINALIZE);
+ strvalue(x) = store_string(sc,len,str,0);
+ strlength(x) = len;
+ return (x);
+}
+
+INTERFACE pointer mk_empty_string(scheme *sc, int len, char fill) {
+ pointer x = get_cell(sc, sc->NIL, sc->NIL);
+ typeflag(x) = (T_STRING | T_ATOM | T_FINALIZE);
+ strvalue(x) = store_string(sc,len,0,fill);
+ strlength(x) = len;
+ return (x);
+}
+
+INTERFACE static pointer mk_vector(scheme *sc, int len)
+{ return get_vector_object(sc,len,sc->NIL); }
+
+INTERFACE static void fill_vector(pointer vec, pointer obj) {
+ size_t i;
+ assert (is_vector (vec));
+ for(i = 0; i < vector_length(vec); i++) {
+ vec->_object._vector._elements[i] = obj;
+ }
+}
+
+INTERFACE static pointer *vector_elem_slot(pointer vec, int ielem) {
+ assert (is_vector (vec));
+ assert (ielem < vector_length(vec));
+ return &vec->_object._vector._elements[ielem];
+}
+
+INTERFACE static pointer vector_elem(pointer vec, int ielem) {
+ assert (is_vector (vec));
+ assert (ielem < vector_length(vec));
+ return vec->_object._vector._elements[ielem];
+}
+
+INTERFACE static pointer set_vector_elem(pointer vec, int ielem, pointer a) {
+ assert (is_vector (vec));
+ assert (ielem < vector_length(vec));
+ vec->_object._vector._elements[ielem] = a;
+ return a;
+}
+
+/* get new symbol */
+INTERFACE pointer mk_symbol(scheme *sc, const char *name) {
+#define mk_symbol_allocates oblist_add_by_name_allocates
+ pointer x;
+ pointer *slot;
+
+ /* first check oblist */
+ x = oblist_find_by_name(sc, name, &slot);
+ if (x != sc->NIL) {
+ return (x);
+ } else {
+ x = oblist_add_by_name(sc, name, slot);
+ return (x);
+ }
+}
+
+INTERFACE pointer gensym(scheme *sc) {
+ pointer x;
+ pointer *slot;
+ char name[40];
+
+ for(; sc->gensym_cnt<LONG_MAX; sc->gensym_cnt++) {
+ snprintf(name,40,"gensym-%ld",sc->gensym_cnt);
+
+ /* first check oblist */
+ x = oblist_find_by_name(sc, name, &slot);
+
+ if (x != sc->NIL) {
+ continue;
+ } else {
+ x = oblist_add_by_name(sc, name, slot);
+ return (x);
+ }
+ }
+
+ return sc->NIL;
+}
+
+/* double the size of the string buffer */
+static int expand_strbuff(scheme *sc) {
+ size_t new_size = sc->strbuff_size * 2;
+ char *new_buffer = sc->malloc(new_size);
+ if (new_buffer == 0) {
+ sc->no_memory = 1;
+ return 1;
+ }
+ memcpy(new_buffer, sc->strbuff, sc->strbuff_size);
+ sc->free(sc->strbuff);
+ sc->strbuff = new_buffer;
+ sc->strbuff_size = new_size;
+ return 0;
+}
+
+/* make symbol or number atom from string */
+static pointer mk_atom(scheme *sc, char *q) {
+ char c, *p;
+ int has_dec_point=0;
+ int has_fp_exp = 0;
+
+#if USE_COLON_HOOK
+ char *next;
+ next = p = q;
+ while ((next = strstr(next, "::")) != 0) {
+ /* Keep looking for the last occurrence. */
+ p = next;
+ next = next + 2;
+ }
+
+ if (p != q) {
+ *p=0;
+ return cons(sc, sc->COLON_HOOK,
+ cons(sc,
+ cons(sc,
+ sc->QUOTE,
+ cons(sc, mk_symbol(sc, strlwr(p + 2)),
+ sc->NIL)),
+ cons(sc, mk_atom(sc, q), sc->NIL)));
+ }
+#endif
+
+ p = q;
+ c = *p++;
+ if ((c == '+') || (c == '-')) {
+ c = *p++;
+ if (c == '.') {
+ has_dec_point=1;
+ c = *p++;
+ }
+ if (!isdigit(c)) {
+ return (mk_symbol(sc, strlwr(q)));
+ }
+ } else if (c == '.') {
+ has_dec_point=1;
+ c = *p++;
+ if (!isdigit(c)) {
+ return (mk_symbol(sc, strlwr(q)));
+ }
+ } else if (!isdigit(c)) {
+ return (mk_symbol(sc, strlwr(q)));
+ }
+
+ for ( ; (c = *p) != 0; ++p) {
+ if (!isdigit(c)) {
+ if(c=='.') {
+ if(!has_dec_point) {
+ has_dec_point=1;
+ continue;
+ }
+ }
+ else if ((c == 'e') || (c == 'E')) {
+ if(!has_fp_exp) {
+ has_dec_point = 1; /* decimal point illegal
+ from now on */
+ p++;
+ if ((*p == '-') || (*p == '+') || isdigit(*p)) {
+ continue;
+ }
+ }
+ }
+ return (mk_symbol(sc, strlwr(q)));
+ }
+ }
+ if(has_dec_point) {
+ return mk_real(sc,atof(q));
+ }
+ return (mk_integer(sc, atol(q)));
+}
+
+/* make constant */
+static pointer mk_sharp_const(scheme *sc, char *name) {
+ long x;
+ char tmp[STRBUFFSIZE];
+
+ if (!strcmp(name, "t"))
+ return (sc->T);
+ else if (!strcmp(name, "f"))
+ return (sc->F);
+ else if (*name == 'o') {/* #o (octal) */
+ snprintf(tmp, STRBUFFSIZE, "0%s", name+1);
+ sscanf(tmp, "%lo", (long unsigned *)&x);
+ return (mk_integer(sc, x));
+ } else if (*name == 'd') { /* #d (decimal) */
+ sscanf(name+1, "%ld", (long int *)&x);
+ return (mk_integer(sc, x));
+ } else if (*name == 'x') { /* #x (hex) */
+ snprintf(tmp, STRBUFFSIZE, "0x%s", name+1);
+ sscanf(tmp, "%lx", (long unsigned *)&x);
+ return (mk_integer(sc, x));
+ } else if (*name == 'b') { /* #b (binary) */
+ x = binary_decode(name+1);
+ return (mk_integer(sc, x));
+ } else if (*name == '\\') { /* #\w (character) */
+ int c=0;
+ if(stricmp(name+1,"space")==0) {
+ c=' ';
+ } else if(stricmp(name+1,"newline")==0) {
+ c='\n';
+ } else if(stricmp(name+1,"return")==0) {
+ c='\r';
+ } else if(stricmp(name+1,"tab")==0) {
+ c='\t';
+ } else if(name[1]=='x' && name[2]!=0) {
+ int c1=0;
+ if(sscanf(name+2,"%x",(unsigned int *)&c1)==1 && c1 < UCHAR_MAX) {
+ c=c1;
+ } else {
+ return sc->NIL;
+ }
+#if USE_ASCII_NAMES
+ } else if(is_ascii_name(name+1,&c)) {
+ /* nothing */
+#endif
+ } else if(name[2]==0) {
+ c=name[1];
+ } else {
+ return sc->NIL;
+ }
+ return mk_character(sc,c);
+ } else
+ return (sc->NIL);
+}
+
+/* ========== garbage collector ========== */
+
+const int frame_length;
+static void dump_stack_deallocate_frame(scheme *sc, pointer frame);
+
+/*--
+ * We use algorithm E (Knuth, The Art of Computer Programming Vol.1,
+ * sec. 2.3.5), the Schorr-Deutsch-Waite link-inversion algorithm,
+ * for marking.
+ */
+static void mark(pointer a) {
+ pointer t, q, p;
+
+ t = (pointer) 0;
+ p = a;
+E2: if (! is_mark(p))
+ setmark(p);
+ if (is_vector(p) || is_frame(p)) {
+ int i;
+ int len = is_vector(p) ? vector_length(p) : frame_length;
+ for (i = 0; i < len; i++) {
+ mark(p->_object._vector._elements[i]);
+ }
+ }
+#if SHOW_ERROR_LINE
+ else if (is_port(p)) {
+ port *pt = p->_object._port;
+ mark(pt->curr_line);
+ mark(pt->filename);
+ }
+#endif
+ /* Mark tag if p has one. */
+ if (has_tag(p))
+ mark(p + 1);
+ if (is_atom(p))
+ goto E6;
+ /* E4: down car */
+ q = car(p);
+ if (q && !is_mark(q)) {
+ setatom(p); /* a note that we have moved car */
+ car(p) = t;
+ t = p;
+ p = q;
+ goto E2;
+ }
+E5: q = cdr(p); /* down cdr */
+ if (q && !is_mark(q)) {
+ cdr(p) = t;
+ t = p;
+ p = q;
+ goto E2;
+ }
+E6: /* up. Undo the link switching from steps E4 and E5. */
+ if (!t)
+ return;
+ q = t;
+ if (is_atom(q)) {
+ clratom(q);
+ t = car(q);
+ car(q) = p;
+ p = q;
+ goto E5;
+ } else {
+ t = cdr(q);
+ cdr(q) = p;
+ p = q;
+ goto E6;
+ }
+}
+
+/* garbage collection. parameter a, b is marked. */
+static void gc(scheme *sc, pointer a, pointer b) {
+ pointer p;
+ struct cell_segment *s;
+ int i;
+
+ assert (gc_enabled (sc));
+
+ if(sc->gc_verbose) {
+ putstr(sc, "gc...");
+ }
+
+ /* mark system globals */
+ mark(sc->oblist);
+ mark(sc->global_env);
+
+ /* mark current registers */
+ mark(sc->args);
+ mark(sc->envir);
+ mark(sc->code);
+ history_mark(sc);
+ dump_stack_mark(sc);
+ mark(sc->value);
+ mark(sc->inport);
+ mark(sc->save_inport);
+ mark(sc->outport);
+ mark(sc->loadport);
+ for (i = 0; i <= sc->file_i; i++) {
+ mark(sc->load_stack[i].filename);
+ mark(sc->load_stack[i].curr_line);
+ }
+
+ /* Mark recent objects the interpreter doesn't know about yet. */
+ mark(car(sc->sink));
+ /* Mark any older stuff above nested C calls */
+ mark(sc->c_nest);
+
+ /* mark variables a, b */
+ mark(a);
+ mark(b);
+
+ /* garbage collect */
+ clrmark(sc->NIL);
+ sc->fcells = 0;
+ sc->free_cell = sc->NIL;
+ /* free-list is kept sorted by address so as to maintain consecutive
+ ranges, if possible, for use with vectors. Here we scan the cells
+ (which are also kept sorted by address) downwards to build the
+ free-list in sorted order.
+ */
+ for (s = sc->cell_segments; s; s = s->next) {
+ p = s->cells + s->cells_len;
+ while (--p >= s->cells) {
+ if ((typeflag(p) & 1) == 0)
+ /* All types have the LSB set. This is not a typeflag. */
+ continue;
+ if (is_mark(p)) {
+ clrmark(p);
+ } else {
+ /* reclaim cell */
+ if ((typeflag(p) & T_FINALIZE) == 0
+ || finalize_cell(sc, p)) {
+ /* Reclaim cell. */
+ ++sc->fcells;
+ typeflag(p) = 0;
+ car(p) = sc->NIL;
+ cdr(p) = sc->free_cell;
+ sc->free_cell = p;
+ }
+ }
+ }
+ }
+
+ if (sc->gc_verbose) {
+ char msg[80];
+ snprintf(msg,80,"done: %ld cells were recovered.\n", sc->fcells);
+ putstr(sc,msg);
+ }
+
+ /* if only a few recovered, get more to avoid fruitless gc's */
+ if (sc->fcells < CELL_MINRECOVER
+ && alloc_cellseg(sc, 1) == 0)
+ sc->no_memory = 1;
+}
+
+/* Finalize A. Returns true if a can be added to the list of free
+ * cells. */
+static int
+finalize_cell(scheme *sc, pointer a)
+{
+ switch (type(a)) {
+ case T_STRING:
+ sc->free(strvalue(a));
+ break;
+
+ case T_PORT:
+ if(a->_object._port->kind&port_file
+ && a->_object._port->rep.stdio.closeit) {
+ port_close(sc,a,port_input|port_output);
+ } else if (a->_object._port->kind & port_srfi6) {
+ sc->free(a->_object._port->rep.string.start);
+ }
+ sc->free(a->_object._port);
+ break;
+
+ case T_FOREIGN_OBJECT:
+ a->_object._foreign_object._vtable->finalize(sc, a->_object._foreign_object._data);
+ break;
+
+ case T_VECTOR:
+ do {
+ int i;
+ for (i = vector_size(vector_length(a)) - 1; i > 0; i--) {
+ pointer p = a + i;
+ typeflag(p) = 0;
+ car(p) = sc->NIL;
+ cdr(p) = sc->free_cell;
+ sc->free_cell = p;
+ sc->fcells += 1;
+ }
+ } while (0);
+ break;
+
+ case T_FRAME:
+ dump_stack_deallocate_frame(sc, a);
+ return 0; /* Do not free cell. */
+ }
+
+ return 1; /* Free cell. */
+}
+
+#if SHOW_ERROR_LINE
+static void
+port_clear_location (scheme *sc, port *p)
+{
+ p->curr_line = sc->NIL;
+ p->filename = sc->NIL;
+}
+
+static void
+port_increment_current_line (scheme *sc, port *p, long delta)
+{
+ if (delta == 0)
+ return;
+
+ p->curr_line =
+ mk_integer(sc, ivalue_unchecked(p->curr_line) + delta);
+}
+
+static void
+port_init_location (scheme *sc, port *p, pointer name)
+{
+ p->curr_line = mk_integer(sc, 0);
+ p->filename = name ? name : mk_string(sc, "<unknown>");
+}
+
+#else
+
+static void
+port_clear_location (scheme *sc, port *p)
+{
+}
+
+static void
+port_increment_current_line (scheme *sc, port *p, long delta)
+{
+}
+
+static void
+port_init_location (scheme *sc, port *p, pointer name)
+{
+}
+
+#endif
+
+/* ========== Routines for Reading ========== */
+
+static int file_push(scheme *sc, pointer fname) {
+ FILE *fin = NULL;
+
+ if (sc->file_i == MAXFIL-1)
+ return 0;
+ fin = fopen(string_value(fname), "r");
+ if(fin!=0) {
+ sc->file_i++;
+ sc->load_stack[sc->file_i].kind=port_file|port_input;
+ sc->load_stack[sc->file_i].rep.stdio.file=fin;
+ sc->load_stack[sc->file_i].rep.stdio.closeit=1;
+ sc->nesting_stack[sc->file_i]=0;
+ sc->loadport->_object._port=sc->load_stack+sc->file_i;
+ port_init_location(sc, &sc->load_stack[sc->file_i], fname);
+ }
+ return fin!=0;
+}
+
+static void file_pop(scheme *sc) {
+ if(sc->file_i != 0) {
+ sc->nesting=sc->nesting_stack[sc->file_i];
+ port_close(sc,sc->loadport,port_input);
+ port_clear_location(sc, &sc->load_stack[sc->file_i]);
+ sc->file_i--;
+ sc->loadport->_object._port=sc->load_stack+sc->file_i;
+ }
+}
+
+static int file_interactive(scheme *sc) {
+ return sc->file_i==0 && sc->load_stack[0].rep.stdio.file==stdin
+ && sc->inport->_object._port->kind&port_file;
+}
+
+static port *port_rep_from_filename(scheme *sc, const char *fn, int prop) {
+ FILE *f;
+ char *rw;
+ port *pt;
+ if(prop==(port_input|port_output)) {
+ rw="a+";
+ } else if(prop==port_output) {
+ rw="w";
+ } else {
+ rw="r";
+ }
+ f=fopen(fn,rw);
+ if(f==0) {
+ return 0;
+ }
+ pt=port_rep_from_file(sc,f,prop);
+ pt->rep.stdio.closeit=1;
+ port_init_location(sc, pt, mk_string(sc, fn));
+ return pt;
+}
+
+static pointer port_from_filename(scheme *sc, const char *fn, int prop) {
+ port *pt;
+ pt=port_rep_from_filename(sc,fn,prop);
+ if(pt==0) {
+ return sc->NIL;
+ }
+ return mk_port(sc,pt);
+}
+
+static port *port_rep_from_file(scheme *sc, FILE *f, int prop)
+{
+ port *pt;
+
+ pt = (port *)sc->malloc(sizeof *pt);
+ if (pt == NULL) {
+ return NULL;
+ }
+ pt->kind = port_file | prop;
+ pt->rep.stdio.file = f;
+ pt->rep.stdio.closeit = 0;
+ port_init_location(sc, pt, NULL);
+ return pt;
+}
+
+static pointer port_from_file(scheme *sc, FILE *f, int prop) {
+ port *pt;
+ pt=port_rep_from_file(sc,f,prop);
+ if(pt==0) {
+ return sc->NIL;
+ }
+ return mk_port(sc,pt);
+}
+
+static port *port_rep_from_string(scheme *sc, char *start, char *past_the_end, int prop) {
+ port *pt;
+ pt=(port*)sc->malloc(sizeof(port));
+ if(pt==0) {
+ return 0;
+ }
+ pt->kind=port_string|prop;
+ pt->rep.string.start=start;
+ pt->rep.string.curr=start;
+ pt->rep.string.past_the_end=past_the_end;
+ port_init_location(sc, pt, NULL);
+ return pt;
+}
+
+static pointer port_from_string(scheme *sc, char *start, char *past_the_end, int prop) {
+ port *pt;
+ pt=port_rep_from_string(sc,start,past_the_end,prop);
+ if(pt==0) {
+ return sc->NIL;
+ }
+ return mk_port(sc,pt);
+}
+
+#define BLOCK_SIZE 256
+
+static port *port_rep_from_scratch(scheme *sc) {
+ port *pt;
+ char *start;
+ pt=(port*)sc->malloc(sizeof(port));
+ if(pt==0) {
+ return 0;
+ }
+ start=sc->malloc(BLOCK_SIZE);
+ if(start==0) {
+ return 0;
+ }
+ memset(start,' ',BLOCK_SIZE-1);
+ start[BLOCK_SIZE-1]='\0';
+ pt->kind=port_string|port_output|port_srfi6;
+ pt->rep.string.start=start;
+ pt->rep.string.curr=start;
+ pt->rep.string.past_the_end=start+BLOCK_SIZE-1;
+ port_init_location(sc, pt, NULL);
+ return pt;
+}
+
+static pointer port_from_scratch(scheme *sc) {
+ port *pt;
+ pt=port_rep_from_scratch(sc);
+ if(pt==0) {
+ return sc->NIL;
+ }
+ return mk_port(sc,pt);
+}
+
+static void port_close(scheme *sc, pointer p, int flag) {
+ port *pt=p->_object._port;
+ pt->kind&=~flag;
+ if((pt->kind & (port_input|port_output))==0) {
+ /* Cleanup is here so (close-*-port) functions could work too */
+ port_clear_location(sc, pt);
+ if(pt->kind&port_file) {
+ fclose(pt->rep.stdio.file);
+ }
+ pt->kind=port_free;
+ }
+}
+
+/* get new character from input file */
+static int inchar(scheme *sc) {
+ int c;
+ port *pt;
+
+ pt = sc->inport->_object._port;
+ if(pt->kind & port_saw_EOF)
+ { return EOF; }
+ c = basic_inchar(pt);
+ if(c == EOF && sc->inport == sc->loadport) {
+ /* Instead, set port_saw_EOF */
+ pt->kind |= port_saw_EOF;
+
+ /* file_pop(sc); */
+ return EOF;
+ /* NOTREACHED */
+ }
+ return c;
+}
+
+static int basic_inchar(port *pt) {
+ if(pt->kind & port_file) {
+ return fgetc(pt->rep.stdio.file);
+ } else {
+ if(*pt->rep.string.curr == 0 ||
+ pt->rep.string.curr == pt->rep.string.past_the_end) {
+ return EOF;
+ } else {
+ return *pt->rep.string.curr++;
+ }
+ }
+}
+
+/* back character to input buffer */
+static void backchar(scheme *sc, int c) {
+ port *pt;
+ if(c==EOF) return;
+ pt=sc->inport->_object._port;
+ if(pt->kind&port_file) {
+ ungetc(c,pt->rep.stdio.file);
+ } else {
+ if(pt->rep.string.curr!=pt->rep.string.start) {
+ --pt->rep.string.curr;
+ }
+ }
+}
+
+static int realloc_port_string(scheme *sc, port *p)
+{
+ char *start=p->rep.string.start;
+ size_t old_size = p->rep.string.past_the_end - start;
+ size_t new_size=p->rep.string.past_the_end-start+1+BLOCK_SIZE;
+ char *str=sc->malloc(new_size);
+ if(str) {
+ memset(str,' ',new_size-1);
+ str[new_size-1]='\0';
+ memcpy(str, start, old_size);
+ p->rep.string.start=str;
+ p->rep.string.past_the_end=str+new_size-1;
+ p->rep.string.curr-=start-str;
+ sc->free(start);
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+INTERFACE void putstr(scheme *sc, const char *s) {
+ port *pt=sc->outport->_object._port;
+ if(pt->kind&port_file) {
+ fputs(s,pt->rep.stdio.file);
+ } else {
+ for(;*s;s++) {
+ if(pt->rep.string.curr!=pt->rep.string.past_the_end) {
+ *pt->rep.string.curr++=*s;
+ } else if(pt->kind&port_srfi6&&realloc_port_string(sc,pt)) {
+ *pt->rep.string.curr++=*s;
+ }
+ }
+ }
+}
+
+static void putchars(scheme *sc, const char *s, int len) {
+ port *pt=sc->outport->_object._port;
+ if(pt->kind&port_file) {
+ fwrite(s,1,len,pt->rep.stdio.file);
+ } else {
+ for(;len;len--) {
+ if(pt->rep.string.curr!=pt->rep.string.past_the_end) {
+ *pt->rep.string.curr++=*s++;
+ } else if(pt->kind&port_srfi6&&realloc_port_string(sc,pt)) {
+ *pt->rep.string.curr++=*s++;
+ }
+ }
+ }
+}
+
+INTERFACE void putcharacter(scheme *sc, int c) {
+ port *pt=sc->outport->_object._port;
+ if(pt->kind&port_file) {
+ fputc(c,pt->rep.stdio.file);
+ } else {
+ if(pt->rep.string.curr!=pt->rep.string.past_the_end) {
+ *pt->rep.string.curr++=c;
+ } else if(pt->kind&port_srfi6&&realloc_port_string(sc,pt)) {
+ *pt->rep.string.curr++=c;
+ }
+ }
+}
+
+/* read characters up to delimiter, but cater to character constants */
+static char *readstr_upto(scheme *sc, char *delim) {
+ char *p = sc->strbuff;
+
+ while ((p - sc->strbuff < sc->strbuff_size) &&
+ !is_one_of(delim, (*p++ = inchar(sc))));
+
+ if(p == sc->strbuff+2 && p[-2] == '\\') {
+ *p=0;
+ } else {
+ backchar(sc,p[-1]);
+ *--p = '\0';
+ }
+ return sc->strbuff;
+}
+
+/* read string expression "xxx...xxx" */
+static pointer readstrexp(scheme *sc) {
+ char *p = sc->strbuff;
+ int c;
+ int c1=0;
+ enum { st_ok, st_bsl, st_x1, st_x2, st_oct1, st_oct2 } state=st_ok;
+
+ for (;;) {
+ c=inchar(sc);
+ if(c == EOF) {
+ return sc->F;
+ }
+ if(p-sc->strbuff > (sc->strbuff_size)-1) {
+ ptrdiff_t offset = p - sc->strbuff;
+ if (expand_strbuff(sc) != 0) {
+ return sc->F;
+ }
+ p = sc->strbuff + offset;
+ }
+ switch(state) {
+ case st_ok:
+ switch(c) {
+ case '\\':
+ state=st_bsl;
+ break;
+ case '"':
+ *p=0;
+ return mk_counted_string(sc,sc->strbuff,p-sc->strbuff);
+ default:
+ *p++=c;
+ break;
+ }
+ break;
+ case st_bsl:
+ switch(c) {
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ state=st_oct1;
+ c1=c-'0';
+ break;
+ case 'x':
+ case 'X':
+ state=st_x1;
+ c1=0;
+ break;
+ case 'n':
+ *p++='\n';
+ state=st_ok;
+ break;
+ case 't':
+ *p++='\t';
+ state=st_ok;
+ break;
+ case 'r':
+ *p++='\r';
+ state=st_ok;
+ break;
+ case '"':
+ *p++='"';
+ state=st_ok;
+ break;
+ default:
+ *p++=c;
+ state=st_ok;
+ break;
+ }
+ break;
+ case st_x1:
+ case st_x2:
+ c=toupper(c);
+ if(c>='0' && c<='F') {
+ if(c<='9') {
+ c1=(c1<<4)+c-'0';
+ } else {
+ c1=(c1<<4)+c-'A'+10;
+ }
+ if(state==st_x1) {
+ state=st_x2;
+ } else {
+ *p++=c1;
+ state=st_ok;
+ }
+ } else {
+ return sc->F;
+ }
+ break;
+ case st_oct1:
+ case st_oct2:
+ if (c < '0' || c > '7')
+ {
+ *p++=c1;
+ backchar(sc, c);
+ state=st_ok;
+ }
+ else
+ {
+ if (state==st_oct2 && c1 >= 32)
+ return sc->F;
+
+ c1=(c1<<3)+(c-'0');
+
+ if (state == st_oct1)
+ state=st_oct2;
+ else
+ {
+ *p++=c1;
+ state=st_ok;
+ }
+ }
+ break;
+
+ }
+ }
+}
+
+/* check c is in chars */
+static INLINE int is_one_of(char *s, int c) {
+ if(c==EOF) return 1;
+ while (*s)
+ if (*s++ == c)
+ return (1);
+ return (0);
+}
+
+/* skip white characters */
+static INLINE int skipspace(scheme *sc) {
+ int c = 0, curr_line = 0;
+
+ do {
+ c=inchar(sc);
+#if SHOW_ERROR_LINE
+ if(c=='\n')
+ curr_line++;
+#endif
+ } while (isspace(c));
+
+ /* record it */
+ port_increment_current_line(sc, &sc->load_stack[sc->file_i], curr_line);
+
+ if(c!=EOF) {
+ backchar(sc,c);
+ return 1;
+ }
+ else
+ { return EOF; }
+}
+
+/* get token */
+static int token(scheme *sc) {
+ int c;
+ c = skipspace(sc);
+ if(c == EOF) { return (TOK_EOF); }
+ switch (c=inchar(sc)) {
+ case EOF:
+ return (TOK_EOF);
+ case '(':
+ return (TOK_LPAREN);
+ case ')':
+ return (TOK_RPAREN);
+ case '.':
+ c=inchar(sc);
+ if(is_one_of(" \n\t",c)) {
+ return (TOK_DOT);
+ } else {
+ backchar(sc,c);
+ backchar(sc,'.');
+ return TOK_ATOM;
+ }
+ case '\'':
+ return (TOK_QUOTE);
+ case ';':
+ while ((c=inchar(sc)) != '\n' && c!=EOF)
+ ;
+
+ if(c == '\n')
+ port_increment_current_line(sc, &sc->load_stack[sc->file_i], 1);
+
+ if(c == EOF)
+ { return (TOK_EOF); }
+ else
+ { return (token(sc));}
+ case '"':
+ return (TOK_DQUOTE);
+ case BACKQUOTE:
+ return (TOK_BQUOTE);
+ case ',':
+ if ((c=inchar(sc)) == '@') {
+ return (TOK_ATMARK);
+ } else {
+ backchar(sc,c);
+ return (TOK_COMMA);
+ }
+ case '#':
+ c=inchar(sc);
+ if (c == '(') {
+ return (TOK_VEC);
+ } else if(c == '!') {
+ while ((c=inchar(sc)) != '\n' && c!=EOF)
+ ;
+
+ if(c == '\n')
+ port_increment_current_line(sc, &sc->load_stack[sc->file_i], 1);
+
+ if(c == EOF)
+ { return (TOK_EOF); }
+ else
+ { return (token(sc));}
+ } else {
+ backchar(sc,c);
+ if(is_one_of(" tfodxb\\",c)) {
+ return TOK_SHARP_CONST;
+ } else {
+ return (TOK_SHARP);
+ }
+ }
+ default:
+ backchar(sc,c);
+ return (TOK_ATOM);
+ }
+}
+
+/* ========== Routines for Printing ========== */
+#define ok_abbrev(x) (is_pair(x) && cdr(x) == sc->NIL)
+
+static void printslashstring(scheme *sc, char *p, int len) {
+ int i;
+ unsigned char *s=(unsigned char*)p;
+ putcharacter(sc,'"');
+ for ( i=0; i<len; i++) {
+ if(*s==0xff || *s=='"' || *s<' ' || *s=='\\') {
+ putcharacter(sc,'\\');
+ switch(*s) {
+ case '"':
+ putcharacter(sc,'"');
+ break;
+ case '\n':
+ putcharacter(sc,'n');
+ break;
+ case '\t':
+ putcharacter(sc,'t');
+ break;
+ case '\r':
+ putcharacter(sc,'r');
+ break;
+ case '\\':
+ putcharacter(sc,'\\');
+ break;
+ default: {
+ int d=*s/16;
+ putcharacter(sc,'x');
+ if(d<10) {
+ putcharacter(sc,d+'0');
+ } else {
+ putcharacter(sc,d-10+'A');
+ }
+ d=*s%16;
+ if(d<10) {
+ putcharacter(sc,d+'0');
+ } else {
+ putcharacter(sc,d-10+'A');
+ }
+ }
+ }
+ } else {
+ putcharacter(sc,*s);
+ }
+ s++;
+ }
+ putcharacter(sc,'"');
+}
+
+
+/* print atoms */
+static void printatom(scheme *sc, pointer l, int f) {
+ char *p;
+ int len;
+ atom2str(sc,l,f,&p,&len);
+ putchars(sc,p,len);
+}
+
+
+/* Uses internal buffer unless string pointer is already available */
+static void atom2str(scheme *sc, pointer l, int f, char **pp, int *plen) {
+ char *p;
+
+ if (l == sc->NIL) {
+ p = "()";
+ } else if (l == sc->T) {
+ p = "#t";
+ } else if (l == sc->F) {
+ p = "#f";
+ } else if (l == sc->EOF_OBJ) {
+ p = "#<EOF>";
+ } else if (is_port(l)) {
+ p = "#<PORT>";
+ } else if (is_number(l)) {
+ p = sc->strbuff;
+ if (f <= 1 || f == 10) /* f is the base for numbers if > 1 */ {
+ if(num_is_integer(l)) {
+ snprintf(p, STRBUFFSIZE, "%ld", ivalue_unchecked(l));
+ } else {
+ snprintf(p, STRBUFFSIZE, "%.10g", rvalue_unchecked(l));
+ /* r5rs says there must be a '.' (unless 'e'?) */
+ f = strcspn(p, ".e");
+ if (p[f] == 0) {
+ p[f] = '.'; /* not found, so add '.0' at the end */
+ p[f+1] = '0';
+ p[f+2] = 0;
+ }
+ }
+ } else {
+ long v = ivalue(l);
+ if (f == 16) {
+ if (v >= 0)
+ snprintf(p, STRBUFFSIZE, "%lx", v);
+ else
+ snprintf(p, STRBUFFSIZE, "-%lx", -v);
+ } else if (f == 8) {
+ if (v >= 0)
+ snprintf(p, STRBUFFSIZE, "%lo", v);
+ else
+ snprintf(p, STRBUFFSIZE, "-%lo", -v);
+ } else if (f == 2) {
+ unsigned long b = (v < 0) ? -v : v;
+ p = &p[STRBUFFSIZE-1];
+ *p = 0;
+ do { *--p = (b&1) ? '1' : '0'; b >>= 1; } while (b != 0);
+ if (v < 0) *--p = '-';
+ }
+ }
+ } else if (is_string(l)) {
+ if (!f) {
+ *pp = strvalue(l);
+ *plen = strlength(l);
+ return;
+ } else { /* Hack, uses the fact that printing is needed */
+ *pp=sc->strbuff;
+ *plen=0;
+ printslashstring(sc, strvalue(l), strlength(l));
+ return;
+ }
+ } else if (is_character(l)) {
+ int c=charvalue(l);
+ p = sc->strbuff;
+ if (!f) {
+ p[0]=c;
+ p[1]=0;
+ } else {
+ switch(c) {
+ case ' ':
+ p = "#\\space";
+ break;
+ case '\n':
+ p = "#\\newline";
+ break;
+ case '\r':
+ p = "#\\return";
+ break;
+ case '\t':
+ p = "#\\tab";
+ break;
+ default:
+#if USE_ASCII_NAMES
+ if(c==127) {
+ p = "#\\del";
+ break;
+ } else if(c<32) {
+ snprintf(p,STRBUFFSIZE, "#\\%s",charnames[c]);
+ break;
+ }
+#else
+ if(c<32) {
+ snprintf(p,STRBUFFSIZE,"#\\x%x",c);
+ break;
+ }
+#endif
+ snprintf(p,STRBUFFSIZE,"#\\%c",c);
+ break;
+ }
+ }
+ } else if (is_symbol(l)) {
+ p = symname(l);
+ } else if (is_proc(l)) {
+ p = sc->strbuff;
+ snprintf(p,STRBUFFSIZE,"#<%s PROCEDURE %ld>", procname(l),procnum(l));
+ } else if (is_macro(l)) {
+ p = "#<MACRO>";
+ } else if (is_closure(l)) {
+ p = "#<CLOSURE>";
+ } else if (is_promise(l)) {
+ p = "#<PROMISE>";
+ } else if (is_foreign(l)) {
+ p = sc->strbuff;
+ snprintf(p,STRBUFFSIZE,"#<FOREIGN PROCEDURE %ld>", procnum(l));
+ } else if (is_continuation(l)) {
+ p = "#<CONTINUATION>";
+ } else if (is_foreign_object(l)) {
+ p = sc->strbuff;
+ l->_object._foreign_object._vtable->to_string(sc, p, STRBUFFSIZE, l->_object._foreign_object._data);
+ } else {
+ p = "#<ERROR>";
+ }
+ *pp=p;
+ *plen=strlen(p);
+}
+/* ========== Routines for Evaluation Cycle ========== */
+
+/* make closure. c is code. e is environment */
+static pointer mk_closure(scheme *sc, pointer c, pointer e) {
+ pointer x = get_cell(sc, c, e);
+
+ typeflag(x) = T_CLOSURE;
+ car(x) = c;
+ cdr(x) = e;
+ return (x);
+}
+
+/* make continuation. */
+static pointer mk_continuation(scheme *sc, pointer d) {
+ pointer x = get_cell(sc, sc->NIL, d);
+
+ typeflag(x) = T_CONTINUATION;
+ cont_dump(x) = d;
+ return (x);
+}
+
+static pointer list_star(scheme *sc, pointer d) {
+ pointer p, q;
+ if(cdr(d)==sc->NIL) {
+ return car(d);
+ }
+ p=cons(sc,car(d),cdr(d));
+ q=p;
+ while(cdr(cdr(p))!=sc->NIL) {
+ d=cons(sc,car(p),cdr(p));
+ if(cdr(cdr(p))!=sc->NIL) {
+ p=cdr(d);
+ }
+ }
+ cdr(p)=car(cdr(p));
+ return q;
+}
+
+/* reverse list -- produce new list */
+static pointer reverse(scheme *sc, pointer term, pointer list) {
+/* a must be checked by gc */
+ pointer a = list, p = term;
+
+ for ( ; is_pair(a); a = cdr(a)) {
+ p = cons(sc, car(a), p);
+ }
+ return (p);
+}
+
+/* reverse list --- in-place */
+static pointer reverse_in_place(scheme *sc, pointer term, pointer list) {
+ pointer p = list, result = term, q;
+
+ while (p != sc->NIL) {
+ q = cdr(p);
+ cdr(p) = result;
+ result = p;
+ p = q;
+ }
+ return (result);
+}
+
+/* append list -- produce new list (in reverse order) */
+static pointer revappend(scheme *sc, pointer a, pointer b) {
+ pointer result = a;
+ pointer p = b;
+
+ while (is_pair(p)) {
+ result = cons(sc, car(p), result);
+ p = cdr(p);
+ }
+
+ if (p == sc->NIL) {
+ return result;
+ }
+
+ return sc->F; /* signal an error */
+}
+
+/* equivalence of atoms */
+int eqv(pointer a, pointer b) {
+ if (is_string(a)) {
+ if (is_string(b))
+ return (strvalue(a) == strvalue(b));
+ else
+ return (0);
+ } else if (is_number(a)) {
+ if (is_number(b)) {
+ if (num_is_integer(a) == num_is_integer(b))
+ return num_eq(nvalue(a),nvalue(b));
+ }
+ return (0);
+ } else if (is_character(a)) {
+ if (is_character(b))
+ return charvalue(a)==charvalue(b);
+ else
+ return (0);
+ } else if (is_port(a)) {
+ if (is_port(b))
+ return a==b;
+ else
+ return (0);
+ } else if (is_proc(a)) {
+ if (is_proc(b))
+ return procnum(a)==procnum(b);
+ else
+ return (0);
+ } else {
+ return (a == b);
+ }
+}
+
+/* true or false value macro */
+/* () is #t in R5RS */
+#define is_true(p) ((p) != sc->F)
+#define is_false(p) ((p) == sc->F)
+
+
+/* ========== Environment implementation ========== */
+
+#if !defined(USE_ALIST_ENV) || !defined(USE_OBJECT_LIST)
+
+static int hash_fn(const char *key, int table_size)
+{
+ unsigned int hashed = 0;
+ const char *c;
+ int bits_per_int = sizeof(unsigned int)*8;
+
+ for (c = key; *c; c++) {
+ /* letters have about 5 bits in them */
+ hashed = (hashed<<5) | (hashed>>(bits_per_int-5));
+ hashed ^= *c;
+ }
+ return hashed % table_size;
+}
+#endif
+
+/* Compares A and B. Returns an integer less than, equal to, or
+ * greater than zero if A is stored at a memory location that is
+ * numerical less than, equal to, or greater than that of B. */
+static int
+pointercmp(pointer a, pointer b)
+{
+ uintptr_t a_n = (uintptr_t) a;
+ uintptr_t b_n = (uintptr_t) b;
+
+ if (a_n < b_n)
+ return -1;
+ if (a_n > b_n)
+ return 1;
+ return 0;
+}
+
+#ifndef USE_ALIST_ENV
+
+/*
+ * In this implementation, each frame of the environment may be
+ * a hash table: a vector of alists hashed by variable name.
+ * In practice, we use a vector only for the initial frame;
+ * subsequent frames are too small and transient for the lookup
+ * speed to out-weigh the cost of making a new vector.
+ */
+
+static void new_frame_in_env(scheme *sc, pointer old_env)
+{
+ pointer new_frame;
+
+ /* The interaction-environment has about 480 variables in it. */
+ if (old_env == sc->NIL) {
+ new_frame = mk_vector(sc, 751);
+ } else {
+ new_frame = sc->NIL;
+ }
+
+ gc_disable(sc, 1);
+ sc->envir = immutable_cons(sc, new_frame, old_env);
+ gc_enable(sc);
+ setenvironment(sc->envir);
+}
+
+/* Find the slot in ENV under the key HDL. If ALL is given, look in
+ * all environments enclosing ENV. If the lookup fails, and SSLOT is
+ * given, the position where the new slot has to be inserted is stored
+ * at SSLOT. */
+static pointer
+find_slot_spec_in_env(scheme *sc, pointer env, pointer hdl, int all, pointer **sslot)
+{
+ pointer x,y;
+ int location;
+ pointer *sl;
+ int d;
+ assert(is_symbol(hdl));
+
+ for (x = env; x != sc->NIL; x = cdr(x)) {
+ if (is_vector(car(x))) {
+ location = hash_fn(symname(hdl), vector_length(car(x)));
+ sl = vector_elem_slot(car(x), location);
+ } else {
+ sl = &car(x);
+ }
+ for (y = *sl ; y != sc->NIL; sl = &cdr(y), y = *sl) {
+ d = pointercmp(caar(y), hdl);
+ if (d == 0)
+ return car(y); /* Hit. */
+ else if (d > 0)
+ break; /* Miss. */
+ }
+
+ if (x == env && sslot)
+ *sslot = sl; /* Insert here. */
+
+ if (!all)
+ return sc->NIL; /* Miss, and stop looking. */
+ }
+
+ return sc->NIL; /* Not found in any environment. */
+}
+
+#else /* USE_ALIST_ENV */
+
+static INLINE void new_frame_in_env(scheme *sc, pointer old_env)
+{
+ sc->envir = immutable_cons(sc, sc->NIL, old_env);
+ setenvironment(sc->envir);
+}
+
+/* Find the slot in ENV under the key HDL. If ALL is given, look in
+ * all environments enclosing ENV. If the lookup fails, and SSLOT is
+ * given, the position where the new slot has to be inserted is stored
+ * at SSLOT. */
+static pointer
+find_slot_spec_in_env(scheme *sc, pointer env, pointer hdl, int all, pointer **sslot)
+{
+ pointer x,y;
+ pointer *sl;
+ int d;
+ assert(is_symbol(hdl));
+
+ for (x = env; x != sc->NIL; x = cdr(x)) {
+ for (sl = &car(x), y = *sl; y != sc->NIL; sl = &cdr(y), y = *sl) {
+ d = pointercmp(caar(y), hdl);
+ if (d == 0)
+ return car(y); /* Hit. */
+ else if (d > 0)
+ break; /* Miss. */
+ }
+
+ if (x == env && sslot)
+ *sslot = sl; /* Insert here. */
+
+ if (!all)
+ return sc->NIL; /* Miss, and stop looking. */
+ }
+
+ return sc->NIL; /* Not found in any environment. */
+}
+
+#endif /* USE_ALIST_ENV else */
+
+static pointer find_slot_in_env(scheme *sc, pointer env, pointer hdl, int all)
+{
+ return find_slot_spec_in_env(sc, env, hdl, all, NULL);
+}
+
+/* Insert (VARIABLE, VALUE) at SSLOT. SSLOT must be obtained using
+ * find_slot_spec_in_env, and no insertion must be done between
+ * obtaining SSLOT and the call to this function. */
+static INLINE void new_slot_spec_in_env(scheme *sc,
+ pointer variable, pointer value,
+ pointer *sslot)
+{
+#define new_slot_spec_in_env_allocates 2
+ pointer slot;
+ gc_disable(sc, gc_reservations (new_slot_spec_in_env));
+ slot = immutable_cons(sc, variable, value);
+ *sslot = immutable_cons(sc, slot, *sslot);
+ gc_enable(sc);
+}
+
+static INLINE void new_slot_in_env(scheme *sc, pointer variable, pointer value)
+{
+#define new_slot_in_env_allocates new_slot_spec_in_env_allocates
+ pointer slot;
+ pointer *sslot;
+ assert(is_symbol(variable));
+ slot = find_slot_spec_in_env(sc, sc->envir, variable, 0, &sslot);
+ assert(slot == sc->NIL);
+ new_slot_spec_in_env(sc, variable, value, sslot);
+}
+
+static INLINE void set_slot_in_env(scheme *sc, pointer slot, pointer value)
+{
+ (void)sc;
+ cdr(slot) = value;
+}
+
+static INLINE pointer slot_value_in_env(pointer slot)
+{
+ return cdr(slot);
+}
+
+
+/* ========== Evaluation Cycle ========== */
+
+
+static enum scheme_opcodes
+_Error_1(scheme *sc, const char *s, pointer a) {
+ const char *str = s;
+ pointer history;
+#if USE_ERROR_HOOK
+ pointer x;
+ pointer hdl=sc->ERROR_HOOK;
+#endif
+
+#if SHOW_ERROR_LINE
+ char sbuf[STRBUFFSIZE];
+#endif
+
+ history = history_flatten(sc);
+
+#if SHOW_ERROR_LINE
+ /* make sure error is not in REPL */
+ if (((sc->load_stack[sc->file_i].kind & port_file) == 0
+ || sc->load_stack[sc->file_i].rep.stdio.file != stdin)) {
+ pointer tag;
+ const char *fname;
+ int ln;
+
+ if (history != sc->NIL && has_tag(car(history))
+ && (tag = get_tag(sc, car(history)))
+ && is_string(car(tag)) && is_integer(cdr(tag))) {
+ fname = string_value(car(tag));
+ ln = ivalue_unchecked(cdr(tag));
+ } else {
+ fname = string_value(sc->load_stack[sc->file_i].filename);
+ ln = ivalue_unchecked(sc->load_stack[sc->file_i].curr_line);
+ }
+
+ /* should never happen */
+ if(!fname) fname = "<unknown>";
+
+ /* we started from 0 */
+ ln++;
+ snprintf(sbuf, STRBUFFSIZE, "%s:%i: %s", fname, ln, s);
+
+ str = (const char*)sbuf;
+ }
+#endif
+
+#if USE_ERROR_HOOK
+ x=find_slot_in_env(sc,sc->envir,hdl,1);
+ if (x != sc->NIL) {
+ sc->code = cons(sc, cons(sc, sc->QUOTE,
+ cons(sc, history, sc->NIL)),
+ sc->NIL);
+ if(a!=0) {
+ sc->code = cons(sc, cons(sc, sc->QUOTE, cons(sc, a, sc->NIL)),
+ sc->code);
+ } else {
+ sc->code = cons(sc, sc->F, sc->code);
+ }
+ sc->code = cons(sc, mk_string(sc, str), sc->code);
+ setimmutable(car(sc->code));
+ sc->code = cons(sc, slot_value_in_env(x), sc->code);
+ return OP_EVAL;
+ }
+#endif
+
+ if(a!=0) {
+ sc->args = cons(sc, (a), sc->NIL);
+ } else {
+ sc->args = sc->NIL;
+ }
+ sc->args = cons(sc, mk_string(sc, str), sc->args);
+ setimmutable(car(sc->args));
+ return OP_ERR0;
+}
+#define Error_1(sc,s, a) { op = _Error_1(sc,s,a); goto dispatch; }
+#define Error_0(sc,s) { op = _Error_1(sc,s,0); goto dispatch; }
+
+/* Too small to turn into function */
+# define BEGIN do {
+# define END } while (0)
+
+
+
+/* Flags. The interpreter has a flags field. When the interpreter
+ * pushes a frame to the dump stack, it is encoded with the opcode.
+ * Therefore, we do not use the least significant byte. */
+
+/* Masks used to encode and decode opcode and flags. */
+#define S_OP_MASK 0x000000ff
+#define S_FLAG_MASK 0xffffff00
+
+/* Set if the interpreter evaluates an expression in a tail context
+ * (see R5RS, section 3.5). If a function, procedure, or continuation
+ * is invoked while this flag is set, the call is recorded as tail
+ * call in the history buffer. */
+#define S_FLAG_TAIL_CONTEXT 0x00000100
+
+/* Set flag F. */
+#define s_set_flag(sc, f) \
+ BEGIN \
+ (sc)->flags |= S_FLAG_ ## f; \
+ END
+
+/* Clear flag F. */
+#define s_clear_flag(sc, f) \
+ BEGIN \
+ (sc)->flags &= ~ S_FLAG_ ## f; \
+ END
+
+/* Check if flag F is set. */
+#define s_get_flag(sc, f) \
+ !!((sc)->flags & S_FLAG_ ## f)
+
+
+
+/* Bounce back to Eval_Cycle and execute A. */
+#define s_goto(sc, a) { op = (a); goto dispatch; }
+
+#if USE_THREADED_CODE
+
+/* Do not bounce back to Eval_Cycle but execute A by jumping directly
+ * to it. */
+#define s_thread_to(sc, a) \
+ BEGIN \
+ op = (a); \
+ goto a; \
+ END
+
+/* Define a label OP and emit a case statement for OP. For use in the
+ * dispatch function. The slightly peculiar goto that is never
+ * executed avoids warnings about unused labels. */
+#define CASE(OP) case OP: if (0) goto OP; OP
+
+#else /* USE_THREADED_CODE */
+#define s_thread_to(sc, a) s_goto(sc, a)
+#define CASE(OP) case OP
+#endif /* USE_THREADED_CODE */
+
+/* Return to the previous frame on the dump stack, setting the current
+ * value to A. */
+#define s_return(sc, a) s_goto(sc, _s_return(sc, a, 0))
+
+/* Return to the previous frame on the dump stack, setting the current
+ * value to A, and re-enable the garbage collector. */
+#define s_return_enable_gc(sc, a) s_goto(sc, _s_return(sc, a, 1))
+
+static INLINE void dump_stack_reset(scheme *sc)
+{
+ sc->dump = sc->NIL;
+}
+
+static INLINE void dump_stack_initialize(scheme *sc)
+{
+ dump_stack_reset(sc);
+ sc->frame_freelist = sc->NIL;
+}
+
+static void dump_stack_free(scheme *sc)
+{
+ dump_stack_initialize(sc);
+}
+
+const int frame_length = 4;
+
+static pointer
+dump_stack_make_frame(scheme *sc)
+{
+ pointer frame;
+
+ frame = mk_vector(sc, frame_length);
+ if (! sc->no_memory)
+ setframe(frame);
+
+ return frame;
+}
+
+static INLINE pointer *
+frame_slots(pointer frame)
+{
+ return &frame->_object._vector._elements[0];
+}
+
+#define frame_payload vector_length
+
+static pointer
+dump_stack_allocate_frame(scheme *sc)
+{
+ pointer frame = sc->frame_freelist;
+ if (frame == sc->NIL) {
+ if (gc_enabled(sc))
+ frame = dump_stack_make_frame(sc);
+ else
+ gc_reservation_failure(sc);
+ } else
+ sc->frame_freelist = *frame_slots(frame);
+ return frame;
+}
+
+static void
+dump_stack_deallocate_frame(scheme *sc, pointer frame)
+{
+ pointer *p = frame_slots(frame);
+ *p++ = sc->frame_freelist;
+ *p++ = sc->NIL;
+ *p++ = sc->NIL;
+ *p++ = sc->NIL;
+ sc->frame_freelist = frame;
+}
+
+static void
+dump_stack_preallocate_frame(scheme *sc)
+{
+ pointer frame = dump_stack_make_frame(sc);
+ if (! sc->no_memory)
+ dump_stack_deallocate_frame(sc, frame);
+}
+
+static enum scheme_opcodes
+_s_return(scheme *sc, pointer a, int enable_gc) {
+ pointer dump = sc->dump;
+ pointer *p;
+ unsigned long v;
+ enum scheme_opcodes next_op;
+ sc->value = (a);
+ if (enable_gc)
+ gc_enable(sc);
+ if (dump == sc->NIL)
+ return OP_QUIT;
+ v = frame_payload(dump);
+ next_op = (int) (v & S_OP_MASK);
+ sc->flags = v & S_FLAG_MASK;
+ p = frame_slots(dump);
+ sc->args = *p++;
+ sc->envir = *p++;
+ sc->code = *p++;
+ sc->dump = *p++;
+ dump_stack_deallocate_frame(sc, dump);
+ return next_op;
+}
+
+static void s_save(scheme *sc, enum scheme_opcodes op, pointer args, pointer code) {
+#define s_save_allocates 0
+ pointer dump;
+ pointer *p;
+ gc_disable(sc, gc_reservations (s_save));
+ dump = dump_stack_allocate_frame(sc);
+ frame_payload(dump) = (size_t) (sc->flags | (unsigned long) op);
+ p = frame_slots(dump);
+ *p++ = args;
+ *p++ = sc->envir;
+ *p++ = code;
+ *p++ = sc->dump;
+ sc->dump = dump;
+ gc_enable(sc);
+}
+
+static INLINE void dump_stack_mark(scheme *sc)
+{
+ mark(sc->dump);
+ mark(sc->frame_freelist);
+}
+
+
+
+#if USE_HISTORY
+
+static void
+history_free(scheme *sc)
+{
+ sc->free(sc->history.m);
+ sc->history.tailstacks = sc->NIL;
+ sc->history.callstack = sc->NIL;
+}
+
+static pointer
+history_init(scheme *sc, size_t N, size_t M)
+{
+ size_t i;
+ struct history *h = &sc->history;
+
+ h->N = N;
+ h->mask_N = N - 1;
+ h->n = N - 1;
+ assert ((N & h->mask_N) == 0);
+
+ h->M = M;
+ h->mask_M = M - 1;
+ assert ((M & h->mask_M) == 0);
+
+ h->callstack = mk_vector(sc, N);
+ if (h->callstack == sc->sink)
+ goto fail;
+
+ h->tailstacks = mk_vector(sc, N);
+ for (i = 0; i < N; i++) {
+ pointer tailstack = mk_vector(sc, M);
+ if (tailstack == sc->sink)
+ goto fail;
+ set_vector_elem(h->tailstacks, i, tailstack);
+ }
+
+ h->m = sc->malloc(N * sizeof *h->m);
+ if (h->m == NULL)
+ goto fail;
+
+ for (i = 0; i < N; i++)
+ h->m[i] = 0;
+
+ return sc->T;
+
+fail:
+ history_free(sc);
+ return sc->F;
+}
+
+static void
+history_mark(scheme *sc)
+{
+ struct history *h = &sc->history;
+ mark(h->callstack);
+ mark(h->tailstacks);
+}
+
+#define add_mod(a, b, mask) (((a) + (b)) & (mask))
+#define sub_mod(a, b, mask) add_mod(a, (mask) + 1 - (b), mask)
+
+static INLINE void
+tailstack_clear(scheme *sc, pointer v)
+{
+ assert(is_vector(v));
+ /* XXX optimize */
+ fill_vector(v, sc->NIL);
+}
+
+static pointer
+callstack_pop(scheme *sc)
+{
+ struct history *h = &sc->history;
+ size_t n = h->n;
+ pointer item;
+
+ if (h->callstack == sc->NIL)
+ return sc->NIL;
+
+ item = vector_elem(h->callstack, n);
+ /* Clear our frame so that it can be gc'ed and we don't run into it
+ * when walking the history. */
+ set_vector_elem(h->callstack, n, sc->NIL);
+ tailstack_clear(sc, vector_elem(h->tailstacks, n));
+
+ /* Exit from the frame. */
+ h->n = sub_mod(h->n, 1, h->mask_N);
+
+ return item;
+}
+
+static void
+callstack_push(scheme *sc, pointer item)
+{
+ struct history *h = &sc->history;
+ size_t n = h->n;
+
+ if (h->callstack == sc->NIL)
+ return;
+
+ /* Enter a new frame. */
+ n = h->n = add_mod(n, 1, h->mask_N);
+
+ /* Initialize tail stack. */
+ tailstack_clear(sc, vector_elem(h->tailstacks, n));
+ h->m[n] = h->mask_M;
+
+ set_vector_elem(h->callstack, n, item);
+}
+
+static void
+tailstack_push(scheme *sc, pointer item)
+{
+ struct history *h = &sc->history;
+ size_t n = h->n;
+ size_t m = h->m[n];
+
+ if (h->callstack == sc->NIL)
+ return;
+
+ /* Enter a new tail frame. */
+ m = h->m[n] = add_mod(m, 1, h->mask_M);
+ set_vector_elem(vector_elem(h->tailstacks, n), m, item);
+}
+
+static pointer
+tailstack_flatten(scheme *sc, pointer tailstack, size_t i, size_t n,
+ pointer acc)
+{
+ struct history *h = &sc->history;
+ pointer frame;
+
+ assert(i <= h->M);
+ assert(n < h->M);
+
+ if (acc == sc->sink)
+ return sc->sink;
+
+ if (i == 0) {
+ /* We reached the end, but we did not see a unused frame. Signal
+ this using '... . */
+ return cons(sc, mk_symbol(sc, "..."), acc);
+ }
+
+ frame = vector_elem(tailstack, n);
+ if (frame == sc->NIL) {
+ /* A unused frame. We reached the end of the history. */
+ return acc;
+ }
+
+ /* Add us. */
+ acc = cons(sc, frame, acc);
+
+ return tailstack_flatten(sc, tailstack, i - 1, sub_mod(n, 1, h->mask_M),
+ acc);
+}
+
+static pointer
+callstack_flatten(scheme *sc, size_t i, size_t n, pointer acc)
+{
+ struct history *h = &sc->history;
+ pointer frame;
+
+ assert(i <= h->N);
+ assert(n < h->N);
+
+ if (acc == sc->sink)
+ return sc->sink;
+
+ if (i == 0) {
+ /* We reached the end, but we did not see a unused frame. Signal
+ this using '... . */
+ return cons(sc, mk_symbol(sc, "..."), acc);
+ }
+
+ frame = vector_elem(h->callstack, n);
+ if (frame == sc->NIL) {
+ /* A unused frame. We reached the end of the history. */
+ return acc;
+ }
+
+ /* First, emit the tail calls. */
+ acc = tailstack_flatten(sc, vector_elem(h->tailstacks, n), h->M, h->m[n],
+ acc);
+
+ /* Then us. */
+ acc = cons(sc, frame, acc);
+
+ return callstack_flatten(sc, i - 1, sub_mod(n, 1, h->mask_N), acc);
+}
+
+static pointer
+history_flatten(scheme *sc)
+{
+ struct history *h = &sc->history;
+ pointer history;
+
+ if (h->callstack == sc->NIL)
+ return sc->NIL;
+
+ history = callstack_flatten(sc, h->N, h->n, sc->NIL);
+ if (history == sc->sink)
+ return sc->sink;
+
+ return reverse_in_place(sc, sc->NIL, history);
+}
+
+#undef add_mod
+#undef sub_mod
+
+#else /* USE_HISTORY */
+
+#define history_init(SC, A, B) (void) 0
+#define history_free(SC) (void) 0
+#define callstack_pop(SC) (void) 0
+#define callstack_push(SC, X) (void) 0
+#define tailstack_push(SC, X) (void) 0
+
+#endif /* USE_HISTORY */
+
+
+
+#if USE_PLIST
+static pointer
+get_property(scheme *sc, pointer obj, pointer key)
+{
+ pointer x;
+
+ assert (is_symbol(obj));
+ assert (is_symbol(key));
+
+ for (x = symprop(obj); x != sc->NIL; x = cdr(x)) {
+ if (caar(x) == key)
+ break;
+ }
+
+ if (x != sc->NIL)
+ return cdar(x);
+
+ return sc->NIL;
+}
+
+static pointer
+set_property(scheme *sc, pointer obj, pointer key, pointer value)
+{
+#define set_property_allocates 2
+ pointer x;
+
+ assert (is_symbol(obj));
+ assert (is_symbol(key));
+
+ for (x = symprop(obj); x != sc->NIL; x = cdr(x)) {
+ if (caar(x) == key)
+ break;
+ }
+
+ if (x != sc->NIL)
+ cdar(x) = value;
+ else {
+ gc_disable(sc, gc_reservations(set_property));
+ symprop(obj) = cons(sc, cons(sc, key, value), symprop(obj));
+ gc_enable(sc);
+ }
+
+ return sc->T;
+}
+#endif
+
+
+
+static int is_list(scheme *sc, pointer a)
+{ return list_length(sc,a) >= 0; }
+
+/* Result is:
+ proper list: length
+ circular list: -1
+ not even a pair: -2
+ dotted list: -2 minus length before dot
+*/
+int list_length(scheme *sc, pointer a) {
+ int i=0;
+ pointer slow, fast;
+
+ slow = fast = a;
+ while (1)
+ {
+ if (fast == sc->NIL)
+ return i;
+ if (!is_pair(fast))
+ return -2 - i;
+ fast = cdr(fast);
+ ++i;
+ if (fast == sc->NIL)
+ return i;
+ if (!is_pair(fast))
+ return -2 - i;
+ ++i;
+ fast = cdr(fast);
+
+ /* Safe because we would have already returned if `fast'
+ encountered a non-pair. */
+ slow = cdr(slow);
+ if (fast == slow)
+ {
+ /* the fast pointer has looped back around and caught up
+ with the slow pointer, hence the structure is circular,
+ not of finite length, and therefore not a list */
+ return -1;
+ }
+ }
+}
+
+
+
+#if GPGRT_GCC_VERSION >= 80000
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
+#endif
+
+#define s_retbool(tf) s_return(sc,(tf) ? sc->T : sc->F)
+
+/* kernel of this interpreter */
+static void
+Eval_Cycle(scheme *sc, enum scheme_opcodes op) {
+ for (;;) {
+ pointer x, y;
+ pointer callsite;
+ num v;
+#if USE_MATH
+ double dd;
+#endif
+ int (*comp_func)(num, num) = NULL;
+ const struct op_code_info *pcd;
+
+ dispatch:
+ pcd = &dispatch_table[op];
+ if (pcd->name[0] != 0) { /* if built-in function, check arguments */
+ char msg[STRBUFFSIZE];
+ if (! check_arguments (sc, pcd, msg, sizeof msg)) {
+ s_goto(sc, _Error_1(sc, msg, 0));
+ }
+ }
+
+ if(sc->no_memory) {
+ fprintf(stderr,"No memory!\n");
+ exit(1);
+ }
+ ok_to_freely_gc(sc);
+
+ switch (op) {
+ CASE(OP_LOAD): /* load */
+ if(file_interactive(sc)) {
+ fprintf(sc->outport->_object._port->rep.stdio.file,
+ "Loading %s\n", strvalue(car(sc->args)));
+ }
+ if (!file_push(sc, car(sc->args))) {
+ Error_1(sc,"unable to open", car(sc->args));
+ }
+ else
+ {
+ sc->args = mk_integer(sc,sc->file_i);
+ s_thread_to(sc,OP_T0LVL);
+ }
+
+ CASE(OP_T0LVL): /* top level */
+ /* If we reached the end of file, this loop is done. */
+ if(sc->loadport->_object._port->kind & port_saw_EOF)
+ {
+ if(sc->file_i == 0)
+ {
+ sc->args=sc->NIL;
+ sc->nesting = sc->nesting_stack[0];
+ s_thread_to(sc,OP_QUIT);
+ }
+ else
+ {
+ file_pop(sc);
+ s_return(sc,sc->value);
+ }
+ /* NOTREACHED */
+ }
+
+ /* If interactive, be nice to user. */
+ if(file_interactive(sc))
+ {
+ sc->envir = sc->global_env;
+ dump_stack_reset(sc);
+ putstr(sc,"\n");
+ putstr(sc,prompt);
+ }
+
+ /* Set up another iteration of REPL */
+ sc->nesting=0;
+ sc->save_inport=sc->inport;
+ sc->inport = sc->loadport;
+ s_save(sc,OP_T0LVL, sc->NIL, sc->NIL);
+ s_save(sc,OP_VALUEPRINT, sc->NIL, sc->NIL);
+ s_save(sc,OP_T1LVL, sc->NIL, sc->NIL);
+ s_thread_to(sc,OP_READ_INTERNAL);
+
+ CASE(OP_T1LVL): /* top level */
+ sc->code = sc->value;
+ sc->inport=sc->save_inport;
+ s_thread_to(sc,OP_EVAL);
+
+ CASE(OP_READ_INTERNAL): /* internal read */
+ sc->tok = token(sc);
+ if(sc->tok==TOK_EOF)
+ { s_return(sc,sc->EOF_OBJ); }
+ s_thread_to(sc,OP_RDSEXPR);
+
+ CASE(OP_GENSYM):
+ s_return(sc, gensym(sc));
+
+ CASE(OP_VALUEPRINT): /* print evaluation result */
+ /* OP_VALUEPRINT is always pushed, because when changing from
+ non-interactive to interactive mode, it needs to be
+ already on the stack */
+ if(sc->tracing) {
+ putstr(sc,"\nGives: ");
+ }
+ if(file_interactive(sc)) {
+ sc->print_flag = 1;
+ sc->args = sc->value;
+ s_thread_to(sc,OP_P0LIST);
+ } else {
+ s_return(sc,sc->value);
+ }
+
+ CASE(OP_EVAL): /* main part of evaluation */
+#if USE_TRACING
+ if(sc->tracing) {
+ /*s_save(sc,OP_VALUEPRINT,sc->NIL,sc->NIL);*/
+ s_save(sc,OP_REAL_EVAL,sc->args,sc->code);
+ sc->args=sc->code;
+ putstr(sc,"\nEval: ");
+ s_thread_to(sc,OP_P0LIST);
+ }
+ /* fall through */
+ CASE(OP_REAL_EVAL):
+#endif
+ if (is_symbol(sc->code)) { /* symbol */
+ x=find_slot_in_env(sc,sc->envir,sc->code,1);
+ if (x != sc->NIL) {
+ s_return(sc,slot_value_in_env(x));
+ } else {
+ Error_1(sc, "eval: unbound variable", sc->code);
+ }
+ } else if (is_pair(sc->code)) {
+ if (is_syntax(x = car(sc->code))) { /* SYNTAX */
+ sc->code = cdr(sc->code);
+ s_goto(sc, syntaxnum(sc, x));
+ } else {/* first, eval top element and eval arguments */
+ s_save(sc,OP_E0ARGS, sc->NIL, sc->code);
+ /* If no macros => s_save(sc,OP_E1ARGS, sc->NIL, cdr(sc->code));*/
+ sc->code = car(sc->code);
+ s_clear_flag(sc, TAIL_CONTEXT);
+ s_thread_to(sc,OP_EVAL);
+ }
+ } else {
+ s_return(sc,sc->code);
+ }
+
+ CASE(OP_E0ARGS): /* eval arguments */
+ if (is_macro(sc->value)) { /* macro expansion */
+ gc_disable(sc, 1 + gc_reservations (s_save));
+ s_save(sc,OP_DOMACRO, sc->NIL, sc->NIL);
+ sc->args = cons(sc,sc->code, sc->NIL);
+ gc_enable(sc);
+ sc->code = sc->value;
+ s_clear_flag(sc, TAIL_CONTEXT);
+ s_thread_to(sc,OP_APPLY);
+ } else {
+ gc_disable(sc, 1);
+ sc->args = cons(sc, sc->code, sc->NIL);
+ gc_enable(sc);
+ sc->code = cdr(sc->code);
+ s_thread_to(sc,OP_E1ARGS);
+ }
+
+ CASE(OP_E1ARGS): /* eval arguments */
+ gc_disable(sc, 1);
+ sc->args = cons(sc, sc->value, sc->args);
+ gc_enable(sc);
+ if (is_pair(sc->code)) { /* continue */
+ s_save(sc,OP_E1ARGS, sc->args, cdr(sc->code));
+ sc->code = car(sc->code);
+ sc->args = sc->NIL;
+ s_clear_flag(sc, TAIL_CONTEXT);
+ s_thread_to(sc,OP_EVAL);
+ } else { /* end */
+ sc->args = reverse_in_place(sc, sc->NIL, sc->args);
+ s_thread_to(sc,OP_APPLY_CODE);
+ }
+
+#if USE_TRACING
+ CASE(OP_TRACING): {
+ int tr=sc->tracing;
+ sc->tracing=ivalue(car(sc->args));
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_integer(sc, tr));
+ }
+#endif
+
+#if USE_HISTORY
+ CASE(OP_CALLSTACK_POP): /* pop the call stack */
+ callstack_pop(sc);
+ s_return(sc, sc->value);
+#endif
+
+ CASE(OP_APPLY_CODE): /* apply 'cadr(args)' to 'cddr(args)',
+ * record in the history as invoked from
+ * 'car(args)' */
+ free_cons(sc, sc->args, &callsite, &sc->args);
+ sc->code = car(sc->args);
+ sc->args = cdr(sc->args);
+ /* Fallthrough. */
+
+ CASE(OP_APPLY): /* apply 'code' to 'args' */
+#if USE_TRACING
+ if(sc->tracing) {
+ s_save(sc,OP_REAL_APPLY,sc->args,sc->code);
+ sc->print_flag = 1;
+ /* sc->args=cons(sc,sc->code,sc->args);*/
+ putstr(sc,"\nApply to: ");
+ s_thread_to(sc,OP_P0LIST);
+ }
+ /* fall through */
+ CASE(OP_REAL_APPLY):
+#endif
+#if USE_HISTORY
+ if (op != OP_APPLY_CODE)
+ callsite = sc->code;
+ if (s_get_flag(sc, TAIL_CONTEXT)) {
+ /* We are evaluating a tail call. */
+ tailstack_push(sc, callsite);
+ } else {
+ callstack_push(sc, callsite);
+ s_save(sc, OP_CALLSTACK_POP, sc->NIL, sc->NIL);
+ }
+#endif
+
+ if (is_proc(sc->code)) {
+ s_goto(sc,procnum(sc->code)); /* PROCEDURE */
+ } else if (is_foreign(sc->code))
+ {
+ /* Keep nested calls from GC'ing the arglist */
+ push_recent_alloc(sc,sc->args,sc->NIL);
+ x=sc->code->_object._ff(sc,sc->args);
+ s_return(sc,x);
+ } else if (is_closure(sc->code) || is_macro(sc->code)
+ || is_promise(sc->code)) { /* CLOSURE */
+ /* Should not accept promise */
+ /* make environment */
+ new_frame_in_env(sc, closure_env(sc->code));
+ for (x = car(closure_code(sc->code)), y = sc->args;
+ is_pair(x); x = cdr(x), y = cdr(y)) {
+ if (y == sc->NIL) {
+ Error_1(sc, "not enough arguments, missing", x);
+ } else if (is_symbol(car(x))) {
+ new_slot_in_env(sc, car(x), car(y));
+ } else {
+ Error_1(sc, "syntax error in closure: not a symbol", car(x));
+ }
+ }
+
+ if (x == sc->NIL) {
+ if (y != sc->NIL) {
+ Error_0(sc, "too many arguments");
+ }
+ } else if (is_symbol(x))
+ new_slot_in_env(sc, x, y);
+ else {
+ Error_1(sc, "syntax error in closure: not a symbol", x);
+ }
+ sc->code = cdr(closure_code(sc->code));
+ sc->args = sc->NIL;
+ s_set_flag(sc, TAIL_CONTEXT);
+ s_thread_to(sc,OP_BEGIN);
+ } else if (is_continuation(sc->code)) { /* CONTINUATION */
+ sc->dump = cont_dump(sc->code);
+ s_return(sc,sc->args != sc->NIL ? car(sc->args) : sc->NIL);
+ } else {
+ Error_1(sc,"illegal function",sc->code);
+ }
+
+ CASE(OP_DOMACRO): /* do macro */
+ sc->code = sc->value;
+ s_thread_to(sc,OP_EVAL);
+
+#if USE_COMPILE_HOOK
+ CASE(OP_LAMBDA): /* lambda */
+ /* If the hook is defined, apply it to sc->code, otherwise
+ set sc->value fall through */
+ {
+ pointer f=find_slot_in_env(sc,sc->envir,sc->COMPILE_HOOK,1);
+ if(f==sc->NIL) {
+ sc->value = sc->code;
+ /* Fallthru */
+ } else {
+ gc_disable(sc, 1 + gc_reservations (s_save));
+ s_save(sc,OP_LAMBDA1,sc->args,sc->code);
+ sc->args=cons(sc,sc->code,sc->NIL);
+ gc_enable(sc);
+ sc->code=slot_value_in_env(f);
+ s_thread_to(sc,OP_APPLY);
+ }
+ }
+ /* Fallthrough. */
+#else
+ CASE(OP_LAMBDA): /* lambda */
+ sc->value = sc->code;
+ /* Fallthrough. */
+#endif
+
+ CASE(OP_LAMBDA1):
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_closure(sc, sc->value, sc->envir));
+
+
+ CASE(OP_MKCLOSURE): /* make-closure */
+ x=car(sc->args);
+ if(car(x)==sc->LAMBDA) {
+ x=cdr(x);
+ }
+ if(cdr(sc->args)==sc->NIL) {
+ y=sc->envir;
+ } else {
+ y=cadr(sc->args);
+ }
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_closure(sc, x, y));
+
+ CASE(OP_QUOTE): /* quote */
+ s_return(sc,car(sc->code));
+
+ CASE(OP_DEF0): /* define */
+ if(is_immutable(car(sc->code)))
+ Error_1(sc,"define: unable to alter immutable", car(sc->code));
+
+ if (is_pair(car(sc->code))) {
+ x = caar(sc->code);
+ gc_disable(sc, 2);
+ sc->code = cons(sc, sc->LAMBDA, cons(sc, cdar(sc->code), cdr(sc->code)));
+ gc_enable(sc);
+ } else {
+ x = car(sc->code);
+ sc->code = cadr(sc->code);
+ }
+ if (!is_symbol(x)) {
+ Error_0(sc,"variable is not a symbol");
+ }
+ s_save(sc,OP_DEF1, sc->NIL, x);
+ s_thread_to(sc,OP_EVAL);
+
+ CASE(OP_DEF1): { /* define */
+ pointer *sslot;
+ x = find_slot_spec_in_env(sc, sc->envir, sc->code, 0, &sslot);
+ if (x != sc->NIL) {
+ set_slot_in_env(sc, x, sc->value);
+ } else {
+ new_slot_spec_in_env(sc, sc->code, sc->value, sslot);
+ }
+ s_return(sc,sc->code);
+ }
+
+ CASE(OP_DEFP): /* defined? */
+ x=sc->envir;
+ if(cdr(sc->args)!=sc->NIL) {
+ x=cadr(sc->args);
+ }
+ s_retbool(find_slot_in_env(sc,x,car(sc->args),1)!=sc->NIL);
+
+ CASE(OP_SET0): /* set! */
+ if(is_immutable(car(sc->code)))
+ Error_1(sc,"set!: unable to alter immutable variable",car(sc->code));
+ s_save(sc,OP_SET1, sc->NIL, car(sc->code));
+ sc->code = cadr(sc->code);
+ s_thread_to(sc,OP_EVAL);
+
+ CASE(OP_SET1): /* set! */
+ y=find_slot_in_env(sc,sc->envir,sc->code,1);
+ if (y != sc->NIL) {
+ set_slot_in_env(sc, y, sc->value);
+ s_return(sc,sc->value);
+ } else {
+ Error_1(sc, "set!: unbound variable", sc->code);
+ }
+
+
+ CASE(OP_BEGIN): /* begin */
+ {
+ int last;
+
+ if (!is_pair(sc->code)) {
+ s_return(sc,sc->code);
+ }
+
+ last = cdr(sc->code) == sc->NIL;
+ if (!last) {
+ s_save(sc,OP_BEGIN, sc->NIL, cdr(sc->code));
+ }
+ sc->code = car(sc->code);
+ if (! last)
+ /* This is not the end of the list. This is not a tail
+ * position. */
+ s_clear_flag(sc, TAIL_CONTEXT);
+ s_thread_to(sc,OP_EVAL);
+ }
+
+ CASE(OP_IF0): /* if */
+ s_save(sc,OP_IF1, sc->NIL, cdr(sc->code));
+ sc->code = car(sc->code);
+ s_clear_flag(sc, TAIL_CONTEXT);
+ s_thread_to(sc,OP_EVAL);
+
+ CASE(OP_IF1): /* if */
+ if (is_true(sc->value))
+ sc->code = car(sc->code);
+ else
+ sc->code = cadr(sc->code); /* (if #f 1) ==> () because
+ * car(sc->NIL) = sc->NIL */
+ s_thread_to(sc,OP_EVAL);
+
+ CASE(OP_LET0): /* let */
+ sc->args = sc->NIL;
+ sc->value = sc->code;
+ sc->code = is_symbol(car(sc->code)) ? cadr(sc->code) : car(sc->code);
+ s_thread_to(sc,OP_LET1);
+
+ CASE(OP_LET1): /* let (calculate parameters) */
+ gc_disable(sc, 1 + (is_pair(sc->code) ? gc_reservations (s_save) : 0));
+ sc->args = cons(sc, sc->value, sc->args);
+ if (is_pair(sc->code)) { /* continue */
+ if (!is_pair(car(sc->code)) || !is_pair(cdar(sc->code))) {
+ gc_enable(sc);
+ Error_1(sc, "Bad syntax of binding spec in let",
+ car(sc->code));
+ }
+ s_save(sc,OP_LET1, sc->args, cdr(sc->code));
+ gc_enable(sc);
+ sc->code = cadar(sc->code);
+ sc->args = sc->NIL;
+ s_clear_flag(sc, TAIL_CONTEXT);
+ s_thread_to(sc,OP_EVAL);
+ } else { /* end */
+ gc_enable(sc);
+ sc->args = reverse_in_place(sc, sc->NIL, sc->args);
+ sc->code = car(sc->args);
+ sc->args = cdr(sc->args);
+ s_thread_to(sc,OP_LET2);
+ }
+
+ CASE(OP_LET2): /* let */
+ new_frame_in_env(sc, sc->envir);
+ for (x = is_symbol(car(sc->code)) ? cadr(sc->code) : car(sc->code), y = sc->args;
+ y != sc->NIL; x = cdr(x), y = cdr(y)) {
+ new_slot_in_env(sc, caar(x), car(y));
+ }
+ if (is_symbol(car(sc->code))) { /* named let */
+ for (x = cadr(sc->code), sc->args = sc->NIL; x != sc->NIL; x = cdr(x)) {
+ if (!is_pair(x))
+ Error_1(sc, "Bad syntax of binding in let", x);
+ if (!is_list(sc, car(x)))
+ Error_1(sc, "Bad syntax of binding in let", car(x));
+ gc_disable(sc, 1);
+ sc->args = cons(sc, caar(x), sc->args);
+ gc_enable(sc);
+ }
+ gc_disable(sc, 2 + gc_reservations (new_slot_in_env));
+ x = mk_closure(sc, cons(sc, reverse_in_place(sc, sc->NIL, sc->args), cddr(sc->code)), sc->envir);
+ new_slot_in_env(sc, car(sc->code), x);
+ gc_enable(sc);
+ sc->code = cddr(sc->code);
+ sc->args = sc->NIL;
+ } else {
+ sc->code = cdr(sc->code);
+ sc->args = sc->NIL;
+ }
+ s_thread_to(sc,OP_BEGIN);
+
+ CASE(OP_LET0AST): /* let* */
+ if (car(sc->code) == sc->NIL) {
+ new_frame_in_env(sc, sc->envir);
+ sc->code = cdr(sc->code);
+ s_thread_to(sc,OP_BEGIN);
+ }
+ if(!is_pair(car(sc->code)) || !is_pair(caar(sc->code)) || !is_pair(cdaar(sc->code))) {
+ Error_1(sc, "Bad syntax of binding spec in let*", car(sc->code));
+ }
+ s_save(sc,OP_LET1AST, cdr(sc->code), car(sc->code));
+ sc->code = cadaar(sc->code);
+ s_clear_flag(sc, TAIL_CONTEXT);
+ s_thread_to(sc,OP_EVAL);
+
+ CASE(OP_LET1AST): /* let* (make new frame) */
+ new_frame_in_env(sc, sc->envir);
+ s_thread_to(sc,OP_LET2AST);
+
+ CASE(OP_LET2AST): /* let* (calculate parameters) */
+ new_slot_in_env(sc, caar(sc->code), sc->value);
+ sc->code = cdr(sc->code);
+ if (is_pair(sc->code)) { /* continue */
+ s_save(sc,OP_LET2AST, sc->args, sc->code);
+ sc->code = cadar(sc->code);
+ sc->args = sc->NIL;
+ s_clear_flag(sc, TAIL_CONTEXT);
+ s_thread_to(sc,OP_EVAL);
+ } else { /* end */
+ sc->code = sc->args;
+ sc->args = sc->NIL;
+ s_thread_to(sc,OP_BEGIN);
+ }
+
+ CASE(OP_LET0REC): /* letrec */
+ new_frame_in_env(sc, sc->envir);
+ sc->args = sc->NIL;
+ sc->value = sc->code;
+ sc->code = car(sc->code);
+ s_thread_to(sc,OP_LET1REC);
+
+ CASE(OP_LET1REC): /* letrec (calculate parameters) */
+ gc_disable(sc, 1);
+ sc->args = cons(sc, sc->value, sc->args);
+ gc_enable(sc);
+ if (is_pair(sc->code)) { /* continue */
+ if (!is_pair(car(sc->code)) || !is_pair(cdar(sc->code))) {
+ Error_1(sc, "Bad syntax of binding spec in letrec",
+ car(sc->code));
+ }
+ s_save(sc,OP_LET1REC, sc->args, cdr(sc->code));
+ sc->code = cadar(sc->code);
+ sc->args = sc->NIL;
+ s_clear_flag(sc, TAIL_CONTEXT);
+ s_thread_to(sc,OP_EVAL);
+ } else { /* end */
+ sc->args = reverse_in_place(sc, sc->NIL, sc->args);
+ sc->code = car(sc->args);
+ sc->args = cdr(sc->args);
+ s_thread_to(sc,OP_LET2REC);
+ }
+
+ CASE(OP_LET2REC): /* letrec */
+ for (x = car(sc->code), y = sc->args; y != sc->NIL; x = cdr(x), y = cdr(y)) {
+ new_slot_in_env(sc, caar(x), car(y));
+ }
+ sc->code = cdr(sc->code);
+ sc->args = sc->NIL;
+ s_thread_to(sc,OP_BEGIN);
+
+ CASE(OP_COND0): /* cond */
+ if (!is_pair(sc->code)) {
+ Error_0(sc,"syntax error in cond");
+ }
+ s_save(sc,OP_COND1, sc->NIL, sc->code);
+ sc->code = caar(sc->code);
+ s_clear_flag(sc, TAIL_CONTEXT);
+ s_thread_to(sc,OP_EVAL);
+
+ CASE(OP_COND1): /* cond */
+ if (is_true(sc->value)) {
+ if ((sc->code = cdar(sc->code)) == sc->NIL) {
+ s_return(sc,sc->value);
+ }
+ if(!sc->code || car(sc->code)==sc->FEED_TO) {
+ if(!is_pair(cdr(sc->code))) {
+ Error_0(sc,"syntax error in cond");
+ }
+ gc_disable(sc, 4);
+ x=cons(sc, sc->QUOTE, cons(sc, sc->value, sc->NIL));
+ sc->code=cons(sc,cadr(sc->code),cons(sc,x,sc->NIL));
+ gc_enable(sc);
+ s_thread_to(sc,OP_EVAL);
+ }
+ s_thread_to(sc,OP_BEGIN);
+ } else {
+ if ((sc->code = cdr(sc->code)) == sc->NIL) {
+ s_return(sc,sc->NIL);
+ } else {
+ s_save(sc,OP_COND1, sc->NIL, sc->code);
+ sc->code = caar(sc->code);
+ s_clear_flag(sc, TAIL_CONTEXT);
+ s_thread_to(sc,OP_EVAL);
+ }
+ }
+
+ CASE(OP_DELAY): /* delay */
+ gc_disable(sc, 2);
+ x = mk_closure(sc, cons(sc, sc->NIL, sc->code), sc->envir);
+ typeflag(x)=T_PROMISE;
+ s_return_enable_gc(sc,x);
+
+ CASE(OP_AND0): /* and */
+ if (sc->code == sc->NIL) {
+ s_return(sc,sc->T);
+ }
+ s_save(sc,OP_AND1, sc->NIL, cdr(sc->code));
+ if (cdr(sc->code) != sc->NIL)
+ s_clear_flag(sc, TAIL_CONTEXT);
+ sc->code = car(sc->code);
+ s_thread_to(sc,OP_EVAL);
+
+ CASE(OP_AND1): /* and */
+ if (is_false(sc->value)) {
+ s_return(sc,sc->value);
+ } else if (sc->code == sc->NIL) {
+ s_return(sc,sc->value);
+ } else {
+ s_save(sc,OP_AND1, sc->NIL, cdr(sc->code));
+ if (cdr(sc->code) != sc->NIL)
+ s_clear_flag(sc, TAIL_CONTEXT);
+ sc->code = car(sc->code);
+ s_thread_to(sc,OP_EVAL);
+ }
+
+ CASE(OP_OR0): /* or */
+ if (sc->code == sc->NIL) {
+ s_return(sc,sc->F);
+ }
+ s_save(sc,OP_OR1, sc->NIL, cdr(sc->code));
+ if (cdr(sc->code) != sc->NIL)
+ s_clear_flag(sc, TAIL_CONTEXT);
+ sc->code = car(sc->code);
+ s_thread_to(sc,OP_EVAL);
+
+ CASE(OP_OR1): /* or */
+ if (is_true(sc->value)) {
+ s_return(sc,sc->value);
+ } else if (sc->code == sc->NIL) {
+ s_return(sc,sc->value);
+ } else {
+ s_save(sc,OP_OR1, sc->NIL, cdr(sc->code));
+ if (cdr(sc->code) != sc->NIL)
+ s_clear_flag(sc, TAIL_CONTEXT);
+ sc->code = car(sc->code);
+ s_thread_to(sc,OP_EVAL);
+ }
+
+ CASE(OP_C0STREAM): /* cons-stream */
+ s_save(sc,OP_C1STREAM, sc->NIL, cdr(sc->code));
+ sc->code = car(sc->code);
+ s_thread_to(sc,OP_EVAL);
+
+ CASE(OP_C1STREAM): /* cons-stream */
+ sc->args = sc->value; /* save sc->value to register sc->args for gc */
+ gc_disable(sc, 3);
+ x = mk_closure(sc, cons(sc, sc->NIL, sc->code), sc->envir);
+ typeflag(x)=T_PROMISE;
+ s_return_enable_gc(sc, cons(sc, sc->args, x));
+
+ CASE(OP_MACRO0): /* macro */
+ if (is_pair(car(sc->code))) {
+ x = caar(sc->code);
+ gc_disable(sc, 2);
+ sc->code = cons(sc, sc->LAMBDA, cons(sc, cdar(sc->code), cdr(sc->code)));
+ gc_enable(sc);
+ } else {
+ x = car(sc->code);
+ sc->code = cadr(sc->code);
+ }
+ if (!is_symbol(x)) {
+ Error_0(sc,"variable is not a symbol");
+ }
+ s_save(sc,OP_MACRO1, sc->NIL, x);
+ s_thread_to(sc,OP_EVAL);
+
+ CASE(OP_MACRO1): { /* macro */
+ pointer *sslot;
+ typeflag(sc->value) = T_MACRO;
+ x = find_slot_spec_in_env(sc, sc->envir, sc->code, 0, &sslot);
+ if (x != sc->NIL) {
+ set_slot_in_env(sc, x, sc->value);
+ } else {
+ new_slot_spec_in_env(sc, sc->code, sc->value, sslot);
+ }
+ s_return(sc,sc->code);
+ }
+
+ CASE(OP_CASE0): /* case */
+ s_save(sc,OP_CASE1, sc->NIL, cdr(sc->code));
+ sc->code = car(sc->code);
+ s_clear_flag(sc, TAIL_CONTEXT);
+ s_thread_to(sc,OP_EVAL);
+
+ CASE(OP_CASE1): /* case */
+ for (x = sc->code; x != sc->NIL; x = cdr(x)) {
+ if (!is_pair(y = caar(x))) {
+ break;
+ }
+ for ( ; y != sc->NIL; y = cdr(y)) {
+ if (eqv(car(y), sc->value)) {
+ break;
+ }
+ }
+ if (y != sc->NIL) {
+ break;
+ }
+ }
+ if (x != sc->NIL) {
+ if (is_pair(caar(x))) {
+ sc->code = cdar(x);
+ s_thread_to(sc,OP_BEGIN);
+ } else {/* else */
+ s_save(sc,OP_CASE2, sc->NIL, cdar(x));
+ sc->code = caar(x);
+ s_thread_to(sc,OP_EVAL);
+ }
+ } else {
+ s_return(sc,sc->NIL);
+ }
+
+ CASE(OP_CASE2): /* case */
+ if (is_true(sc->value)) {
+ s_thread_to(sc,OP_BEGIN);
+ } else {
+ s_return(sc,sc->NIL);
+ }
+
+ CASE(OP_PAPPLY): /* apply */
+ sc->code = car(sc->args);
+ sc->args = list_star(sc,cdr(sc->args));
+ /*sc->args = cadr(sc->args);*/
+ s_thread_to(sc,OP_APPLY);
+
+ CASE(OP_PEVAL): /* eval */
+ if(cdr(sc->args)!=sc->NIL) {
+ sc->envir=cadr(sc->args);
+ }
+ sc->code = car(sc->args);
+ s_thread_to(sc,OP_EVAL);
+
+ CASE(OP_CONTINUATION): /* call-with-current-continuation */
+ sc->code = car(sc->args);
+ gc_disable(sc, 2);
+ sc->args = cons(sc, mk_continuation(sc, sc->dump), sc->NIL);
+ gc_enable(sc);
+ s_thread_to(sc,OP_APPLY);
+
+#if USE_MATH
+ CASE(OP_INEX2EX): /* inexact->exact */
+ x=car(sc->args);
+ if(num_is_integer(x)) {
+ s_return(sc,x);
+ } else if(modf(rvalue_unchecked(x),&dd)==0.0) {
+ s_return(sc,mk_integer(sc,ivalue(x)));
+ } else {
+ Error_1(sc, "inexact->exact: not integral", x);
+ }
+
+ CASE(OP_EXP):
+ x=car(sc->args);
+ s_return(sc, mk_real(sc, exp(rvalue(x))));
+
+ CASE(OP_LOG):
+ x=car(sc->args);
+ s_return(sc, mk_real(sc, log(rvalue(x))));
+
+ CASE(OP_SIN):
+ x=car(sc->args);
+ s_return(sc, mk_real(sc, sin(rvalue(x))));
+
+ CASE(OP_COS):
+ x=car(sc->args);
+ s_return(sc, mk_real(sc, cos(rvalue(x))));
+
+ CASE(OP_TAN):
+ x=car(sc->args);
+ s_return(sc, mk_real(sc, tan(rvalue(x))));
+
+ CASE(OP_ASIN):
+ x=car(sc->args);
+ s_return(sc, mk_real(sc, asin(rvalue(x))));
+
+ CASE(OP_ACOS):
+ x=car(sc->args);
+ s_return(sc, mk_real(sc, acos(rvalue(x))));
+
+ CASE(OP_ATAN):
+ x=car(sc->args);
+ if(cdr(sc->args)==sc->NIL) {
+ s_return(sc, mk_real(sc, atan(rvalue(x))));
+ } else {
+ pointer y=cadr(sc->args);
+ s_return(sc, mk_real(sc, atan2(rvalue(x),rvalue(y))));
+ }
+
+ CASE(OP_SQRT):
+ x=car(sc->args);
+ s_return(sc, mk_real(sc, sqrt(rvalue(x))));
+
+ CASE(OP_EXPT): {
+ double result;
+ int real_result=1;
+ pointer y=cadr(sc->args);
+ x=car(sc->args);
+ if (num_is_integer(x) && num_is_integer(y))
+ real_result=0;
+ /* This 'if' is an R5RS compatibility fix. */
+ /* NOTE: Remove this 'if' fix for R6RS. */
+ if (rvalue(x) == 0 && rvalue(y) < 0) {
+ result = 0.0;
+ } else {
+ result = pow(rvalue(x),rvalue(y));
+ }
+ /* Before returning integer result make sure we can. */
+ /* If the test fails, result is too big for integer. */
+ if (!real_result)
+ {
+ long result_as_long = (long)result;
+ if (result != (double)result_as_long)
+ real_result = 1;
+ }
+ if (real_result) {
+ s_return(sc, mk_real(sc, result));
+ } else {
+ s_return(sc, mk_integer(sc, result));
+ }
+ }
+
+ CASE(OP_FLOOR):
+ x=car(sc->args);
+ s_return(sc, mk_real(sc, floor(rvalue(x))));
+
+ CASE(OP_CEILING):
+ x=car(sc->args);
+ s_return(sc, mk_real(sc, ceil(rvalue(x))));
+
+ CASE(OP_TRUNCATE ): {
+ double rvalue_of_x ;
+ x=car(sc->args);
+ rvalue_of_x = rvalue(x) ;
+ if (rvalue_of_x > 0) {
+ s_return(sc, mk_real(sc, floor(rvalue_of_x)));
+ } else {
+ s_return(sc, mk_real(sc, ceil(rvalue_of_x)));
+ }
+ }
+
+ CASE(OP_ROUND):
+ x=car(sc->args);
+ if (num_is_integer(x))
+ s_return(sc, x);
+ s_return(sc, mk_real(sc, round_per_R5RS(rvalue(x))));
+#endif
+
+ CASE(OP_ADD): /* + */
+ v=num_zero;
+ for (x = sc->args; x != sc->NIL; x = cdr(x)) {
+ v=num_add(v,nvalue(car(x)));
+ }
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_number(sc, v));
+
+ CASE(OP_MUL): /* * */
+ v=num_one;
+ for (x = sc->args; x != sc->NIL; x = cdr(x)) {
+ v=num_mul(v,nvalue(car(x)));
+ }
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_number(sc, v));
+
+ CASE(OP_SUB): /* - */
+ if(cdr(sc->args)==sc->NIL) {
+ x=sc->args;
+ v=num_zero;
+ } else {
+ x = cdr(sc->args);
+ v = nvalue(car(sc->args));
+ }
+ for (; x != sc->NIL; x = cdr(x)) {
+ v=num_sub(v,nvalue(car(x)));
+ }
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_number(sc, v));
+
+ CASE(OP_DIV): /* / */
+ if(cdr(sc->args)==sc->NIL) {
+ x=sc->args;
+ v=num_one;
+ } else {
+ x = cdr(sc->args);
+ v = nvalue(car(sc->args));
+ }
+ for (; x != sc->NIL; x = cdr(x)) {
+ if (!is_zero_double(rvalue(car(x))))
+ v=num_div(v,nvalue(car(x)));
+ else {
+ Error_0(sc,"/: division by zero");
+ }
+ }
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_number(sc, v));
+
+ CASE(OP_INTDIV): /* quotient */
+ if(cdr(sc->args)==sc->NIL) {
+ x=sc->args;
+ v=num_one;
+ } else {
+ x = cdr(sc->args);
+ v = nvalue(car(sc->args));
+ }
+ for (; x != sc->NIL; x = cdr(x)) {
+ if (ivalue(car(x)) != 0)
+ v=num_intdiv(v,nvalue(car(x)));
+ else {
+ Error_0(sc,"quotient: division by zero");
+ }
+ }
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_number(sc, v));
+
+ CASE(OP_REM): /* remainder */
+ v = nvalue(car(sc->args));
+ if (ivalue(cadr(sc->args)) != 0)
+ v=num_rem(v,nvalue(cadr(sc->args)));
+ else {
+ Error_0(sc,"remainder: division by zero");
+ }
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_number(sc, v));
+
+ CASE(OP_MOD): /* modulo */
+ v = nvalue(car(sc->args));
+ if (ivalue(cadr(sc->args)) != 0)
+ v=num_mod(v,nvalue(cadr(sc->args)));
+ else {
+ Error_0(sc,"modulo: division by zero");
+ }
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_number(sc, v));
+
+ CASE(OP_CAR): /* car */
+ s_return(sc,caar(sc->args));
+
+ CASE(OP_CDR): /* cdr */
+ s_return(sc,cdar(sc->args));
+
+ CASE(OP_CONS): /* cons */
+ cdr(sc->args) = cadr(sc->args);
+ s_return(sc,sc->args);
+
+ CASE(OP_SETCAR): /* set-car! */
+ if(!is_immutable(car(sc->args))) {
+ caar(sc->args) = cadr(sc->args);
+ s_return(sc,car(sc->args));
+ } else {
+ Error_0(sc,"set-car!: unable to alter immutable pair");
+ }
+
+ CASE(OP_SETCDR): /* set-cdr! */
+ if(!is_immutable(car(sc->args))) {
+ cdar(sc->args) = cadr(sc->args);
+ s_return(sc,car(sc->args));
+ } else {
+ Error_0(sc,"set-cdr!: unable to alter immutable pair");
+ }
+
+ CASE(OP_CHAR2INT): { /* char->integer */
+ char c;
+ c=(char)ivalue(car(sc->args));
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_integer(sc, (unsigned char) c));
+ }
+
+ CASE(OP_INT2CHAR): { /* integer->char */
+ unsigned char c;
+ c=(unsigned char)ivalue(car(sc->args));
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_character(sc, (char) c));
+ }
+
+ CASE(OP_CHARUPCASE): {
+ unsigned char c;
+ c=(unsigned char)ivalue(car(sc->args));
+ c=toupper(c);
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_character(sc, (char) c));
+ }
+
+ CASE(OP_CHARDNCASE): {
+ unsigned char c;
+ c=(unsigned char)ivalue(car(sc->args));
+ c=tolower(c);
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_character(sc, (char) c));
+ }
+
+ CASE(OP_STR2SYM): /* string->symbol */
+ gc_disable(sc, gc_reservations (mk_symbol));
+ s_return_enable_gc(sc, mk_symbol(sc, strvalue(car(sc->args))));
+
+ CASE(OP_STR2ATOM): /* string->atom */ {
+ char *s=strvalue(car(sc->args));
+ long pf = 0;
+ if(cdr(sc->args)!=sc->NIL) {
+ /* we know cadr(sc->args) is a natural number */
+ /* see if it is 2, 8, 10, or 16, or error */
+ pf = ivalue_unchecked(cadr(sc->args));
+ if(pf == 16 || pf == 10 || pf == 8 || pf == 2) {
+ /* base is OK */
+ }
+ else {
+ pf = -1;
+ }
+ }
+ if (pf < 0) {
+ Error_1(sc, "string->atom: bad base", cadr(sc->args));
+ } else if(*s=='#') /* no use of base! */ {
+ s_return(sc, mk_sharp_const(sc, s+1));
+ } else {
+ if (pf == 0 || pf == 10) {
+ s_return(sc, mk_atom(sc, s));
+ }
+ else {
+ char *ep;
+ long iv = strtol(s,&ep,(int )pf);
+ if (*ep == 0) {
+ s_return(sc, mk_integer(sc, iv));
+ }
+ else {
+ s_return(sc, sc->F);
+ }
+ }
+ }
+ }
+
+ CASE(OP_SYM2STR): /* symbol->string */
+ gc_disable(sc, 1);
+ x=mk_string(sc,symname(car(sc->args)));
+ setimmutable(x);
+ s_return_enable_gc(sc, x);
+
+ CASE(OP_ATOM2STR): /* atom->string */ {
+ long pf = 0;
+ x=car(sc->args);
+ if(cdr(sc->args)!=sc->NIL) {
+ /* we know cadr(sc->args) is a natural number */
+ /* see if it is 2, 8, 10, or 16, or error */
+ pf = ivalue_unchecked(cadr(sc->args));
+ if(is_number(x) && (pf == 16 || pf == 10 || pf == 8 || pf == 2)) {
+ /* base is OK */
+ }
+ else {
+ pf = -1;
+ }
+ }
+ if (pf < 0) {
+ Error_1(sc, "atom->string: bad base", cadr(sc->args));
+ } else if(is_number(x) || is_character(x) || is_string(x) || is_symbol(x)) {
+ char *p;
+ int len;
+ atom2str(sc,x,(int )pf,&p,&len);
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_counted_string(sc, p, len));
+ } else {
+ Error_1(sc, "atom->string: not an atom", x);
+ }
+ }
+
+ CASE(OP_MKSTRING): { /* make-string */
+ int fill=' ';
+ int len;
+
+ len=ivalue(car(sc->args));
+
+ if(cdr(sc->args)!=sc->NIL) {
+ fill=charvalue(cadr(sc->args));
+ }
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_empty_string(sc, len, (char) fill));
+ }
+
+ CASE(OP_STRLEN): /* string-length */
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_integer(sc, strlength(car(sc->args))));
+
+ CASE(OP_STRREF): { /* string-ref */
+ char *str;
+ int index;
+
+ str=strvalue(car(sc->args));
+
+ index=ivalue(cadr(sc->args));
+
+ if(index>=strlength(car(sc->args))) {
+ Error_1(sc, "string-ref: out of bounds", cadr(sc->args));
+ }
+
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc,
+ mk_character(sc, ((unsigned char*) str)[index]));
+ }
+
+ CASE(OP_STRSET): { /* string-set! */
+ char *str;
+ int index;
+ int c;
+
+ if(is_immutable(car(sc->args))) {
+ Error_1(sc, "string-set!: unable to alter immutable string",
+ car(sc->args));
+ }
+ str=strvalue(car(sc->args));
+
+ index=ivalue(cadr(sc->args));
+ if(index>=strlength(car(sc->args))) {
+ Error_1(sc, "string-set!: out of bounds", cadr(sc->args));
+ }
+
+ c=charvalue(caddr(sc->args));
+
+ str[index]=(char)c;
+ s_return(sc,car(sc->args));
+ }
+
+ CASE(OP_STRAPPEND): { /* string-append */
+ /* in 1.29 string-append was in Scheme in init.scm but was too slow */
+ int len = 0;
+ pointer newstr;
+ char *pos;
+
+ /* compute needed length for new string */
+ for (x = sc->args; x != sc->NIL; x = cdr(x)) {
+ len += strlength(car(x));
+ }
+ gc_disable(sc, 1);
+ newstr = mk_empty_string(sc, len, ' ');
+ /* store the contents of the argument strings into the new string */
+ for (pos = strvalue(newstr), x = sc->args; x != sc->NIL;
+ pos += strlength(car(x)), x = cdr(x)) {
+ memcpy(pos, strvalue(car(x)), strlength(car(x)));
+ }
+ s_return_enable_gc(sc, newstr);
+ }
+
+ CASE(OP_SUBSTR): { /* substring */
+ char *str;
+ int index0;
+ int index1;
+
+ str=strvalue(car(sc->args));
+
+ index0=ivalue(cadr(sc->args));
+
+ if(index0>strlength(car(sc->args))) {
+ Error_1(sc, "substring: start out of bounds", cadr(sc->args));
+ }
+
+ if(cddr(sc->args)!=sc->NIL) {
+ index1=ivalue(caddr(sc->args));
+ if(index1>strlength(car(sc->args)) || index1<index0) {
+ Error_1(sc, "substring: end out of bounds", caddr(sc->args));
+ }
+ } else {
+ index1=strlength(car(sc->args));
+ }
+
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_counted_string(sc, str + index0, index1 - index0));
+ }
+
+ CASE(OP_VECTOR): { /* vector */
+ int i;
+ pointer vec;
+ int len=list_length(sc,sc->args);
+ if(len<0) {
+ Error_1(sc, "vector: not a proper list", sc->args);
+ }
+ vec=mk_vector(sc,len);
+ if(sc->no_memory) { s_return(sc, sc->sink); }
+ for (x = sc->args, i = 0; is_pair(x); x = cdr(x), i++) {
+ set_vector_elem(vec,i,car(x));
+ }
+ s_return(sc,vec);
+ }
+
+ CASE(OP_MKVECTOR): { /* make-vector */
+ pointer fill=sc->NIL;
+ int len;
+ pointer vec;
+
+ len=ivalue(car(sc->args));
+
+ if(cdr(sc->args)!=sc->NIL) {
+ fill=cadr(sc->args);
+ }
+ vec=mk_vector(sc,len);
+ if(sc->no_memory) { s_return(sc, sc->sink); }
+ if(fill!=sc->NIL) {
+ fill_vector(vec,fill);
+ }
+ s_return(sc,vec);
+ }
+
+ CASE(OP_VECLEN): /* vector-length */
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_integer(sc, vector_length(car(sc->args))));
+
+ CASE(OP_VECREF): { /* vector-ref */
+ int index;
+
+ index=ivalue(cadr(sc->args));
+
+ if(index >= vector_length(car(sc->args))) {
+ Error_1(sc, "vector-ref: out of bounds", cadr(sc->args));
+ }
+
+ s_return(sc,vector_elem(car(sc->args),index));
+ }
+
+ CASE(OP_VECSET): { /* vector-set! */
+ int index;
+
+ if(is_immutable(car(sc->args))) {
+ Error_1(sc, "vector-set!: unable to alter immutable vector",
+ car(sc->args));
+ }
+
+ index=ivalue(cadr(sc->args));
+ if(index >= vector_length(car(sc->args))) {
+ Error_1(sc, "vector-set!: out of bounds", cadr(sc->args));
+ }
+
+ set_vector_elem(car(sc->args),index,caddr(sc->args));
+ s_return(sc,car(sc->args));
+ }
+
+ CASE(OP_NOT): /* not */
+ s_retbool(is_false(car(sc->args)));
+ CASE(OP_BOOLP): /* boolean? */
+ s_retbool(car(sc->args) == sc->F || car(sc->args) == sc->T);
+ CASE(OP_EOFOBJP): /* boolean? */
+ s_retbool(car(sc->args) == sc->EOF_OBJ);
+ CASE(OP_NULLP): /* null? */
+ s_retbool(car(sc->args) == sc->NIL);
+ CASE(OP_NUMEQ): /* = */
+ /* Fallthrough. */
+ CASE(OP_LESS): /* < */
+ /* Fallthrough. */
+ CASE(OP_GRE): /* > */
+ /* Fallthrough. */
+ CASE(OP_LEQ): /* <= */
+ /* Fallthrough. */
+ CASE(OP_GEQ): /* >= */
+ switch(op) {
+ case OP_NUMEQ: comp_func=num_eq; break;
+ case OP_LESS: comp_func=num_lt; break;
+ case OP_GRE: comp_func=num_gt; break;
+ case OP_LEQ: comp_func=num_le; break;
+ case OP_GEQ: comp_func=num_ge; break;
+ default: assert (! "reached");
+ }
+ x=sc->args;
+ v=nvalue(car(x));
+ x=cdr(x);
+
+ for (; x != sc->NIL; x = cdr(x)) {
+ if(!comp_func(v,nvalue(car(x)))) {
+ s_retbool(0);
+ }
+ v=nvalue(car(x));
+ }
+ s_retbool(1);
+ CASE(OP_SYMBOLP): /* symbol? */
+ s_retbool(is_symbol(car(sc->args)));
+ CASE(OP_NUMBERP): /* number? */
+ s_retbool(is_number(car(sc->args)));
+ CASE(OP_STRINGP): /* string? */
+ s_retbool(is_string(car(sc->args)));
+ CASE(OP_INTEGERP): /* integer? */
+ s_retbool(is_integer(car(sc->args)));
+ CASE(OP_REALP): /* real? */
+ s_retbool(is_number(car(sc->args))); /* All numbers are real */
+ CASE(OP_CHARP): /* char? */
+ s_retbool(is_character(car(sc->args)));
+#if USE_CHAR_CLASSIFIERS
+ CASE(OP_CHARAP): /* char-alphabetic? */
+ s_retbool(Cisalpha(ivalue(car(sc->args))));
+ CASE(OP_CHARNP): /* char-numeric? */
+ s_retbool(Cisdigit(ivalue(car(sc->args))));
+ CASE(OP_CHARWP): /* char-whitespace? */
+ s_retbool(Cisspace(ivalue(car(sc->args))));
+ CASE(OP_CHARUP): /* char-upper-case? */
+ s_retbool(Cisupper(ivalue(car(sc->args))));
+ CASE(OP_CHARLP): /* char-lower-case? */
+ s_retbool(Cislower(ivalue(car(sc->args))));
+#endif
+ CASE(OP_PORTP): /* port? */
+ s_retbool(is_port(car(sc->args)));
+ CASE(OP_INPORTP): /* input-port? */
+ s_retbool(is_inport(car(sc->args)));
+ CASE(OP_OUTPORTP): /* output-port? */
+ s_retbool(is_outport(car(sc->args)));
+ CASE(OP_PROCP): /* procedure? */
+ /*--
+ * continuation should be procedure by the example
+ * (call-with-current-continuation procedure?) ==> #t
+ * in R^3 report sec. 6.9
+ */
+ s_retbool(is_proc(car(sc->args)) || is_closure(car(sc->args))
+ || is_continuation(car(sc->args)) || is_foreign(car(sc->args)));
+ CASE(OP_PAIRP): /* pair? */
+ s_retbool(is_pair(car(sc->args)));
+ CASE(OP_LISTP): /* list? */
+ s_retbool(list_length(sc,car(sc->args)) >= 0);
+
+ CASE(OP_ENVP): /* environment? */
+ s_retbool(is_environment(car(sc->args)));
+ CASE(OP_VECTORP): /* vector? */
+ s_retbool(is_vector(car(sc->args)));
+ CASE(OP_EQ): /* eq? */
+ s_retbool(car(sc->args) == cadr(sc->args));
+ CASE(OP_EQV): /* eqv? */
+ s_retbool(eqv(car(sc->args), cadr(sc->args)));
+
+ CASE(OP_FORCE): /* force */
+ sc->code = car(sc->args);
+ if (is_promise(sc->code)) {
+ /* Should change type to closure here */
+ s_save(sc, OP_SAVE_FORCED, sc->NIL, sc->code);
+ sc->args = sc->NIL;
+ s_thread_to(sc,OP_APPLY);
+ } else {
+ s_return(sc,sc->code);
+ }
+
+ CASE(OP_SAVE_FORCED): /* Save forced value replacing promise */
+ copy_value(sc, sc->code, sc->value);
+ s_return(sc,sc->value);
+
+ CASE(OP_WRITE): /* write */
+ /* Fallthrough. */
+ CASE(OP_DISPLAY): /* display */
+ /* Fallthrough. */
+ CASE(OP_WRITE_CHAR): /* write-char */
+ if(is_pair(cdr(sc->args))) {
+ if(cadr(sc->args)!=sc->outport) {
+ x=cons(sc,sc->outport,sc->NIL);
+ s_save(sc,OP_SET_OUTPORT, x, sc->NIL);
+ sc->outport=cadr(sc->args);
+ }
+ }
+ sc->args = car(sc->args);
+ if(op==OP_WRITE) {
+ sc->print_flag = 1;
+ } else {
+ sc->print_flag = 0;
+ }
+ s_thread_to(sc,OP_P0LIST);
+
+ CASE(OP_NEWLINE): /* newline */
+ if(is_pair(sc->args)) {
+ if(car(sc->args)!=sc->outport) {
+ x=cons(sc,sc->outport,sc->NIL);
+ s_save(sc,OP_SET_OUTPORT, x, sc->NIL);
+ sc->outport=car(sc->args);
+ }
+ }
+ putstr(sc, "\n");
+ s_return(sc,sc->T);
+
+ CASE(OP_ERR0): /* error */
+ sc->retcode=-1;
+ if (!is_string(car(sc->args))) {
+ sc->args=cons(sc,mk_string(sc," -- "),sc->args);
+ setimmutable(car(sc->args));
+ }
+ putstr(sc, "Error: ");
+ putstr(sc, strvalue(car(sc->args)));
+ sc->args = cdr(sc->args);
+ s_thread_to(sc,OP_ERR1);
+
+ CASE(OP_ERR1): /* error */
+ putstr(sc, " ");
+ if (sc->args != sc->NIL) {
+ s_save(sc,OP_ERR1, cdr(sc->args), sc->NIL);
+ sc->args = car(sc->args);
+ sc->print_flag = 1;
+ s_thread_to(sc,OP_P0LIST);
+ } else {
+ putstr(sc, "\n");
+ if(sc->interactive_repl) {
+ s_thread_to(sc,OP_T0LVL);
+ } else {
+ return;
+ }
+ }
+
+ CASE(OP_REVERSE): /* reverse */
+ s_return(sc,reverse(sc, sc->NIL, car(sc->args)));
+
+ CASE(OP_REVERSE_IN_PLACE): /* reverse! */
+ s_return(sc, reverse_in_place(sc, sc->NIL, car(sc->args)));
+
+ CASE(OP_LIST_STAR): /* list* */
+ s_return(sc,list_star(sc,sc->args));
+
+ CASE(OP_APPEND): /* append */
+ x = sc->NIL;
+ y = sc->args;
+ if (y == x) {
+ s_return(sc, x);
+ }
+
+ /* cdr() in the while condition is not a typo. If car() */
+ /* is used (append '() 'a) will return the wrong result.*/
+ while (cdr(y) != sc->NIL) {
+ x = revappend(sc, x, car(y));
+ y = cdr(y);
+ if (x == sc->F) {
+ Error_0(sc, "non-list argument to append");
+ }
+ }
+
+ s_return(sc, reverse_in_place(sc, car(y), x));
+
+#if USE_PLIST
+ CASE(OP_SET_SYMBOL_PROPERTY): /* set-symbol-property! */
+ gc_disable(sc, gc_reservations(set_property));
+ s_return_enable_gc(sc,
+ set_property(sc, car(sc->args),
+ cadr(sc->args), caddr(sc->args)));
+
+ CASE(OP_SYMBOL_PROPERTY): /* symbol-property */
+ s_return(sc, get_property(sc, car(sc->args), cadr(sc->args)));
+#endif /* USE_PLIST */
+
+ CASE(OP_TAG_VALUE): { /* not exposed */
+ /* This tags sc->value with car(sc->args). Useful to tag
+ * results of opcode evaluations. */
+ pointer a, b, c;
+ free_cons(sc, sc->args, &a, &b);
+ free_cons(sc, b, &b, &c);
+ assert(c == sc->NIL);
+ s_return(sc, mk_tagged_value(sc, sc->value, a, b));
+ }
+
+ CASE(OP_MK_TAGGED): /* make-tagged-value */
+ if (is_vector(car(sc->args)))
+ Error_0(sc, "cannot tag vector");
+ s_return(sc, mk_tagged_value(sc, car(sc->args),
+ car(cadr(sc->args)),
+ cdr(cadr(sc->args))));
+
+ CASE(OP_GET_TAG): /* get-tag */
+ s_return(sc, get_tag(sc, car(sc->args)));
+
+ CASE(OP_QUIT): /* quit */
+ if(is_pair(sc->args)) {
+ sc->retcode=ivalue(car(sc->args));
+ }
+ return;
+
+ CASE(OP_GC): /* gc */
+ gc(sc, sc->NIL, sc->NIL);
+ s_return(sc,sc->T);
+
+ CASE(OP_GCVERB): /* gc-verbose */
+ { int was = sc->gc_verbose;
+
+ sc->gc_verbose = (car(sc->args) != sc->F);
+ s_retbool(was);
+ }
+
+ CASE(OP_NEWSEGMENT): /* new-segment */
+ if (!is_pair(sc->args) || !is_number(car(sc->args))) {
+ Error_0(sc,"new-segment: argument must be a number");
+ }
+ alloc_cellseg(sc, (int) ivalue(car(sc->args)));
+ s_return(sc,sc->T);
+
+ CASE(OP_OBLIST): /* oblist */
+ s_return(sc, oblist_all_symbols(sc));
+
+ CASE(OP_CURR_INPORT): /* current-input-port */
+ s_return(sc,sc->inport);
+
+ CASE(OP_CURR_OUTPORT): /* current-output-port */
+ s_return(sc,sc->outport);
+
+ CASE(OP_OPEN_INFILE): /* open-input-file */
+ /* Fallthrough. */
+ CASE(OP_OPEN_OUTFILE): /* open-output-file */
+ /* Fallthrough. */
+ CASE(OP_OPEN_INOUTFILE): /* open-input-output-file */ {
+ int prop=0;
+ pointer p;
+ switch(op) {
+ case OP_OPEN_INFILE: prop=port_input; break;
+ case OP_OPEN_OUTFILE: prop=port_output; break;
+ case OP_OPEN_INOUTFILE: prop=port_input|port_output; break;
+ default: assert (! "reached");
+ }
+ p=port_from_filename(sc,strvalue(car(sc->args)),prop);
+ if(p==sc->NIL) {
+ s_return(sc,sc->F);
+ }
+ s_return(sc,p);
+ break;
+ }
+
+#if USE_STRING_PORTS
+ CASE(OP_OPEN_INSTRING): /* open-input-string */
+ /* Fallthrough. */
+ CASE(OP_OPEN_INOUTSTRING): /* open-input-output-string */ {
+ int prop=0;
+ pointer p;
+ switch(op) {
+ case OP_OPEN_INSTRING: prop=port_input; break;
+ case OP_OPEN_INOUTSTRING: prop=port_input|port_output; break;
+ default: assert (! "reached");
+ }
+ p=port_from_string(sc, strvalue(car(sc->args)),
+ strvalue(car(sc->args))+strlength(car(sc->args)), prop);
+ if(p==sc->NIL) {
+ s_return(sc,sc->F);
+ }
+ s_return(sc,p);
+ }
+ CASE(OP_OPEN_OUTSTRING): /* open-output-string */ {
+ pointer p;
+ if(car(sc->args)==sc->NIL) {
+ p=port_from_scratch(sc);
+ if(p==sc->NIL) {
+ s_return(sc,sc->F);
+ }
+ } else {
+ p=port_from_string(sc, strvalue(car(sc->args)),
+ strvalue(car(sc->args))+strlength(car(sc->args)),
+ port_output);
+ if(p==sc->NIL) {
+ s_return(sc,sc->F);
+ }
+ }
+ s_return(sc,p);
+ }
+ CASE(OP_GET_OUTSTRING): /* get-output-string */ {
+ port *p;
+
+ if ((p=car(sc->args)->_object._port)->kind&port_string) {
+ gc_disable(sc, 1);
+ s_return_enable_gc(
+ sc,
+ mk_counted_string(sc,
+ p->rep.string.start,
+ p->rep.string.curr - p->rep.string.start));
+ }
+ s_return(sc,sc->F);
+ }
+#endif
+
+ CASE(OP_CLOSE_INPORT): /* close-input-port */
+ port_close(sc,car(sc->args),port_input);
+ s_return(sc,sc->T);
+
+ CASE(OP_CLOSE_OUTPORT): /* close-output-port */
+ port_close(sc,car(sc->args),port_output);
+ s_return(sc,sc->T);
+
+ CASE(OP_INT_ENV): /* interaction-environment */
+ s_return(sc,sc->global_env);
+
+ CASE(OP_CURR_ENV): /* current-environment */
+ s_return(sc,sc->envir);
+
+
+ /* ========== reading part ========== */
+ CASE(OP_READ):
+ if(!is_pair(sc->args)) {
+ s_thread_to(sc,OP_READ_INTERNAL);
+ }
+ if(!is_inport(car(sc->args))) {
+ Error_1(sc, "read: not an input port", car(sc->args));
+ }
+ if(car(sc->args)==sc->inport) {
+ s_thread_to(sc,OP_READ_INTERNAL);
+ }
+ x=sc->inport;
+ sc->inport=car(sc->args);
+ x=cons(sc,x,sc->NIL);
+ s_save(sc,OP_SET_INPORT, x, sc->NIL);
+ s_thread_to(sc,OP_READ_INTERNAL);
+
+ CASE(OP_READ_CHAR): /* read-char */
+ /* Fallthrough. */
+ CASE(OP_PEEK_CHAR): /* peek-char */ {
+ int c;
+ if(is_pair(sc->args)) {
+ if(car(sc->args)!=sc->inport) {
+ x=sc->inport;
+ x=cons(sc,x,sc->NIL);
+ s_save(sc,OP_SET_INPORT, x, sc->NIL);
+ sc->inport=car(sc->args);
+ }
+ }
+ c=inchar(sc);
+ if(c==EOF) {
+ s_return(sc,sc->EOF_OBJ);
+ }
+ if(op==OP_PEEK_CHAR) {
+ backchar(sc,c);
+ }
+ s_return(sc,mk_character(sc,c));
+ }
+
+ CASE(OP_CHAR_READY): /* char-ready? */ {
+ pointer p=sc->inport;
+ int res;
+ if(is_pair(sc->args)) {
+ p=car(sc->args);
+ }
+ res=p->_object._port->kind&port_string;
+ s_retbool(res);
+ }
+
+ CASE(OP_SET_INPORT): /* set-input-port */
+ sc->inport=car(sc->args);
+ s_return(sc,sc->value);
+
+ CASE(OP_SET_OUTPORT): /* set-output-port */
+ sc->outport=car(sc->args);
+ s_return(sc,sc->value);
+
+ CASE(OP_RDSEXPR):
+ switch (sc->tok) {
+ case TOK_EOF:
+ s_return(sc,sc->EOF_OBJ);
+ /* NOTREACHED */
+ case TOK_VEC:
+ s_save(sc,OP_RDVEC,sc->NIL,sc->NIL);
+ /* fall through */
+ case TOK_LPAREN:
+ sc->tok = token(sc);
+ if (sc->tok == TOK_RPAREN) {
+ s_return(sc,sc->NIL);
+ } else if (sc->tok == TOK_DOT) {
+ Error_0(sc,"syntax error: illegal dot expression");
+ } else {
+#if SHOW_ERROR_LINE
+ pointer filename;
+ pointer lineno;
+#endif
+ sc->nesting_stack[sc->file_i]++;
+#if SHOW_ERROR_LINE
+ filename = sc->load_stack[sc->file_i].filename;
+ lineno = sc->load_stack[sc->file_i].curr_line;
+
+ s_save(sc, OP_TAG_VALUE,
+ cons(sc, filename, cons(sc, lineno, sc->NIL)),
+ sc->NIL);
+#endif
+ s_save(sc,OP_RDLIST, sc->NIL, sc->NIL);
+ s_thread_to(sc,OP_RDSEXPR);
+ }
+ case TOK_QUOTE:
+ s_save(sc,OP_RDQUOTE, sc->NIL, sc->NIL);
+ sc->tok = token(sc);
+ s_thread_to(sc,OP_RDSEXPR);
+ case TOK_BQUOTE:
+ sc->tok = token(sc);
+ if(sc->tok==TOK_VEC) {
+ s_save(sc,OP_RDQQUOTEVEC, sc->NIL, sc->NIL);
+ sc->tok=TOK_LPAREN;
+ s_thread_to(sc,OP_RDSEXPR);
+ } else {
+ s_save(sc,OP_RDQQUOTE, sc->NIL, sc->NIL);
+ }
+ s_thread_to(sc,OP_RDSEXPR);
+ case TOK_COMMA:
+ s_save(sc,OP_RDUNQUOTE, sc->NIL, sc->NIL);
+ sc->tok = token(sc);
+ s_thread_to(sc,OP_RDSEXPR);
+ case TOK_ATMARK:
+ s_save(sc,OP_RDUQTSP, sc->NIL, sc->NIL);
+ sc->tok = token(sc);
+ s_thread_to(sc,OP_RDSEXPR);
+ case TOK_ATOM:
+ s_return(sc,mk_atom(sc, readstr_upto(sc, DELIMITERS)));
+ case TOK_DQUOTE:
+ x=readstrexp(sc);
+ if(x==sc->F) {
+ Error_0(sc,"Error reading string");
+ }
+ setimmutable(x);
+ s_return(sc,x);
+ case TOK_SHARP: {
+ pointer f=find_slot_in_env(sc,sc->envir,sc->SHARP_HOOK,1);
+ if(f==sc->NIL) {
+ Error_0(sc,"undefined sharp expression");
+ } else {
+ sc->code=cons(sc,slot_value_in_env(f),sc->NIL);
+ s_thread_to(sc,OP_EVAL);
+ }
+ }
+ case TOK_SHARP_CONST:
+ if ((x = mk_sharp_const(sc, readstr_upto(sc, DELIMITERS))) == sc->NIL) {
+ Error_0(sc,"undefined sharp expression");
+ } else {
+ s_return(sc,x);
+ }
+ default:
+ Error_0(sc,"syntax error: illegal token");
+ }
+ break;
+
+ CASE(OP_RDLIST): {
+ gc_disable(sc, 1);
+ sc->args = cons(sc, sc->value, sc->args);
+ gc_enable(sc);
+ sc->tok = token(sc);
+ if (sc->tok == TOK_EOF)
+ { s_return(sc,sc->EOF_OBJ); }
+ else if (sc->tok == TOK_RPAREN) {
+ int c = inchar(sc);
+ if (c != '\n')
+ backchar(sc,c);
+ else
+ port_increment_current_line(sc, &sc->load_stack[sc->file_i], 1);
+ sc->nesting_stack[sc->file_i]--;
+ s_return(sc,reverse_in_place(sc, sc->NIL, sc->args));
+ } else if (sc->tok == TOK_DOT) {
+ s_save(sc,OP_RDDOT, sc->args, sc->NIL);
+ sc->tok = token(sc);
+ s_thread_to(sc,OP_RDSEXPR);
+ } else {
+ s_save(sc,OP_RDLIST, sc->args, sc->NIL);;
+ s_thread_to(sc,OP_RDSEXPR);
+ }
+ }
+
+ CASE(OP_RDDOT):
+ if (token(sc) != TOK_RPAREN) {
+ Error_0(sc,"syntax error: illegal dot expression");
+ } else {
+ sc->nesting_stack[sc->file_i]--;
+ s_return(sc,reverse_in_place(sc, sc->value, sc->args));
+ }
+
+ CASE(OP_RDQUOTE):
+ gc_disable(sc, 2);
+ s_return_enable_gc(sc, cons(sc, sc->QUOTE,
+ cons(sc, sc->value, sc->NIL)));
+
+ CASE(OP_RDQQUOTE):
+ gc_disable(sc, 2);
+ s_return_enable_gc(sc, cons(sc, sc->QQUOTE,
+ cons(sc, sc->value, sc->NIL)));
+
+ CASE(OP_RDQQUOTEVEC):
+ gc_disable(sc, 5 + 2 * gc_reservations (mk_symbol));
+ s_return_enable_gc(sc,cons(sc, mk_symbol(sc,"apply"),
+ cons(sc, mk_symbol(sc,"vector"),
+ cons(sc,cons(sc, sc->QQUOTE,
+ cons(sc,sc->value,sc->NIL)),
+ sc->NIL))));
+
+ CASE(OP_RDUNQUOTE):
+ gc_disable(sc, 2);
+ s_return_enable_gc(sc, cons(sc, sc->UNQUOTE,
+ cons(sc, sc->value, sc->NIL)));
+
+ CASE(OP_RDUQTSP):
+ gc_disable(sc, 2);
+ s_return_enable_gc(sc, cons(sc, sc->UNQUOTESP,
+ cons(sc, sc->value, sc->NIL)));
+
+ CASE(OP_RDVEC):
+ /*sc->code=cons(sc,mk_proc(sc,OP_VECTOR),sc->value);
+ s_thread_to(sc,OP_EVAL); Cannot be quoted*/
+ /*x=cons(sc,mk_proc(sc,OP_VECTOR),sc->value);
+ s_return(sc,x); Cannot be part of pairs*/
+ /*sc->code=mk_proc(sc,OP_VECTOR);
+ sc->args=sc->value;
+ s_thread_to(sc,OP_APPLY);*/
+ sc->args=sc->value;
+ s_thread_to(sc,OP_VECTOR);
+
+ /* ========== printing part ========== */
+ CASE(OP_P0LIST):
+ if(is_vector(sc->args)) {
+ putstr(sc,"#(");
+ sc->args=cons(sc,sc->args,mk_integer(sc,0));
+ s_thread_to(sc,OP_PVECFROM);
+ } else if(is_environment(sc->args)) {
+ putstr(sc,"#<ENVIRONMENT>");
+ s_return(sc,sc->T);
+ } else if (!is_pair(sc->args)) {
+ printatom(sc, sc->args, sc->print_flag);
+ s_return(sc,sc->T);
+ } else if (car(sc->args) == sc->QUOTE && ok_abbrev(cdr(sc->args))) {
+ putstr(sc, "'");
+ sc->args = cadr(sc->args);
+ s_thread_to(sc,OP_P0LIST);
+ } else if (car(sc->args) == sc->QQUOTE && ok_abbrev(cdr(sc->args))) {
+ putstr(sc, "`");
+ sc->args = cadr(sc->args);
+ s_thread_to(sc,OP_P0LIST);
+ } else if (car(sc->args) == sc->UNQUOTE && ok_abbrev(cdr(sc->args))) {
+ putstr(sc, ",");
+ sc->args = cadr(sc->args);
+ s_thread_to(sc,OP_P0LIST);
+ } else if (car(sc->args) == sc->UNQUOTESP && ok_abbrev(cdr(sc->args))) {
+ putstr(sc, ",@");
+ sc->args = cadr(sc->args);
+ s_thread_to(sc,OP_P0LIST);
+ } else {
+ putstr(sc, "(");
+ s_save(sc,OP_P1LIST, cdr(sc->args), sc->NIL);
+ sc->args = car(sc->args);
+ s_thread_to(sc,OP_P0LIST);
+ }
+
+ CASE(OP_P1LIST):
+ if (is_pair(sc->args)) {
+ s_save(sc,OP_P1LIST, cdr(sc->args), sc->NIL);
+ putstr(sc, " ");
+ sc->args = car(sc->args);
+ s_thread_to(sc,OP_P0LIST);
+ } else if(is_vector(sc->args)) {
+ s_save(sc,OP_P1LIST,sc->NIL,sc->NIL);
+ putstr(sc, " . ");
+ s_thread_to(sc,OP_P0LIST);
+ } else {
+ if (sc->args != sc->NIL) {
+ putstr(sc, " . ");
+ printatom(sc, sc->args, sc->print_flag);
+ }
+ putstr(sc, ")");
+ s_return(sc,sc->T);
+ }
+ CASE(OP_PVECFROM): {
+ int i=ivalue_unchecked(cdr(sc->args));
+ pointer vec=car(sc->args);
+ int len = vector_length(vec);
+ if(i==len) {
+ putstr(sc,")");
+ s_return(sc,sc->T);
+ } else {
+ pointer elem=vector_elem(vec,i);
+ cdr(sc->args) = mk_integer(sc, i + 1);
+ s_save(sc,OP_PVECFROM, sc->args, sc->NIL);
+ sc->args=elem;
+ if (i > 0)
+ putstr(sc," ");
+ s_thread_to(sc,OP_P0LIST);
+ }
+ }
+
+ CASE(OP_LIST_LENGTH): { /* length */ /* a.k */
+ long l = list_length(sc, car(sc->args));
+ if(l<0) {
+ Error_1(sc, "length: not a list", car(sc->args));
+ }
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, mk_integer(sc, l));
+ }
+ CASE(OP_ASSQ): /* assq */ /* a.k */
+ x = car(sc->args);
+ for (y = cadr(sc->args); is_pair(y); y = cdr(y)) {
+ if (!is_pair(car(y))) {
+ Error_0(sc,"unable to handle non pair element");
+ }
+ if (x == caar(y))
+ break;
+ }
+ if (is_pair(y)) {
+ s_return(sc,car(y));
+ } else {
+ s_return(sc,sc->F);
+ }
+
+
+ CASE(OP_GET_CLOSURE): /* get-closure-code */ /* a.k */
+ sc->args = car(sc->args);
+ if (sc->args == sc->NIL) {
+ s_return(sc,sc->F);
+ } else if (is_closure(sc->args)) {
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, cons(sc, sc->LAMBDA,
+ closure_code(sc->value)));
+ } else if (is_macro(sc->args)) {
+ gc_disable(sc, 1);
+ s_return_enable_gc(sc, cons(sc, sc->LAMBDA,
+ closure_code(sc->value)));
+ } else {
+ s_return(sc,sc->F);
+ }
+ CASE(OP_CLOSUREP): /* closure? */
+ /*
+ * Note, macro object is also a closure.
+ * Therefore, (closure? <#MACRO>) ==> #t
+ */
+ s_retbool(is_closure(car(sc->args)));
+ CASE(OP_MACROP): /* macro? */
+ s_retbool(is_macro(car(sc->args)));
+ CASE(OP_VM_HISTORY): /* *vm-history* */
+ s_return(sc, history_flatten(sc));
+ default:
+ snprintf(sc->strbuff,STRBUFFSIZE,"%d: illegal operator", op);
+ Error_0(sc,sc->strbuff);
+ }
+ }
+}
+
+#if GPGRT_GCC_VERSION >= 80000
+# pragma GCC diagnostic pop
+#endif
+
+
+typedef int (*test_predicate)(pointer);
+
+static int is_any(pointer p) {
+ (void)p;
+ return 1;
+}
+
+static int is_nonneg(pointer p) {
+ return ivalue(p)>=0 && is_integer(p);
+}
+
+/* Correspond carefully with following defines! */
+static const struct {
+ test_predicate fct;
+ const char *kind;
+} tests[]={
+ {0,0}, /* unused */
+ {is_any, 0},
+ {is_string, "string"},
+ {is_symbol, "symbol"},
+ {is_port, "port"},
+ {is_inport,"input port"},
+ {is_outport,"output port"},
+ {is_environment, "environment"},
+ {is_pair, "pair"},
+ {0, "pair or '()"},
+ {is_character, "character"},
+ {is_vector, "vector"},
+ {is_number, "number"},
+ {is_integer, "integer"},
+ {is_nonneg, "non-negative integer"}
+};
+
+#define TST_NONE 0
+#define TST_ANY "\001"
+#define TST_STRING "\002"
+#define TST_SYMBOL "\003"
+#define TST_PORT "\004"
+#define TST_INPORT "\005"
+#define TST_OUTPORT "\006"
+#define TST_ENVIRONMENT "\007"
+#define TST_PAIR "\010"
+#define TST_LIST "\011"
+#define TST_CHAR "\012"
+#define TST_VECTOR "\013"
+#define TST_NUMBER "\014"
+#define TST_INTEGER "\015"
+#define TST_NATURAL "\016"
+
+#define INF_ARG 0xff
+
+static const struct op_code_info dispatch_table[]= {
+#define _OP_DEF(A,B,C,D,OP) {{A},B,C,{D}},
+#include "opdefines.h"
+#undef _OP_DEF
+ {{0},0,0,{0}},
+};
+
+static const char *procname(pointer x) {
+ int n=procnum(x);
+ const char *name=dispatch_table[n].name;
+ if (name[0] == 0) {
+ name="ILLEGAL!";
+ }
+ return name;
+}
+
+static int
+check_arguments (scheme *sc, const struct op_code_info *pcd, char *msg, size_t msg_size)
+{
+ int ok = 1;
+ int n = list_length(sc, sc->args);
+
+ /* Check number of arguments */
+ if (n < pcd->min_arity) {
+ ok = 0;
+ snprintf(msg, msg_size, "%s: needs%s %d argument(s)",
+ pcd->name,
+ pcd->min_arity == pcd->max_arity ? "" : " at least",
+ pcd->min_arity);
+ }
+ if (ok && n>pcd->max_arity) {
+ ok = 0;
+ snprintf(msg, msg_size, "%s: needs%s %d argument(s)",
+ pcd->name,
+ pcd->min_arity == pcd->max_arity ? "" : " at most",
+ pcd->max_arity);
+ }
+ if (ok) {
+ if (pcd->arg_tests_encoding[0] != 0) {
+ int i = 0;
+ int j;
+ const char *t = pcd->arg_tests_encoding;
+ pointer arglist = sc->args;
+
+ do {
+ pointer arg = car(arglist);
+ j = (int)t[0];
+ if (j == TST_LIST[0]) {
+ if (arg != sc->NIL && !is_pair(arg)) break;
+ } else {
+ if (!tests[j].fct(arg)) break;
+ }
+
+ if (t[1] != 0 && i < sizeof pcd->arg_tests_encoding) {
+ /* last test is replicated as necessary */
+ t++;
+ }
+ arglist = cdr(arglist);
+ i++;
+ } while (i < n);
+
+ if (i < n) {
+ ok = 0;
+ snprintf(msg, msg_size, "%s: argument %d must be: %s, got: %s",
+ pcd->name,
+ i + 1,
+ tests[j].kind,
+ type_to_string(type(car(arglist))));
+ }
+ }
+ }
+
+ return ok;
+}
+
+/* ========== Initialization of internal keywords ========== */
+
+/* Symbols representing syntax are tagged with (OP . '()). */
+static void assign_syntax(scheme *sc, enum scheme_opcodes op, char *name) {
+ pointer x, y;
+ pointer *slot;
+
+ x = oblist_find_by_name(sc, name, &slot);
+ assert (x == sc->NIL);
+
+ x = immutable_cons(sc, mk_string(sc, name), sc->NIL);
+ typeflag(x) = T_SYMBOL | T_SYNTAX;
+ setimmutable(car(x));
+ y = mk_tagged_value(sc, x, mk_integer(sc, op), sc->NIL);
+ free_cell(sc, x);
+ setimmutable(get_tag(sc, y));
+ *slot = immutable_cons(sc, y, *slot);
+}
+
+/* Returns the opcode for the syntax represented by P. */
+static int syntaxnum(scheme *sc, pointer p) {
+ int op = ivalue_unchecked(car(get_tag(sc, p)));
+ assert (op < OP_MAXDEFINED);
+ return op;
+}
+
+static void assign_proc(scheme *sc, enum scheme_opcodes op, const char *name) {
+ pointer x, y;
+
+ x = mk_symbol(sc, name);
+ y = mk_proc(sc,op);
+ new_slot_in_env(sc, x, y);
+}
+
+static pointer mk_proc(scheme *sc, enum scheme_opcodes op) {
+ pointer y;
+
+ y = get_cell(sc, sc->NIL, sc->NIL);
+ typeflag(y) = (T_PROC | T_ATOM);
+ ivalue_unchecked(y) = (long) op;
+ set_num_integer(y);
+ return y;
+}
+
+/* initialization of TinyScheme */
+#if USE_INTERFACE
+INTERFACE static pointer s_cons(scheme *sc, pointer a, pointer b) {
+ return cons(sc,a,b);
+}
+INTERFACE static pointer s_immutable_cons(scheme *sc, pointer a, pointer b) {
+ return immutable_cons(sc,a,b);
+}
+
+static const struct scheme_interface vtbl = {
+ scheme_define,
+ s_cons,
+ s_immutable_cons,
+ reserve_cells,
+ mk_integer,
+ mk_real,
+ mk_symbol,
+ gensym,
+ mk_string,
+ mk_counted_string,
+ mk_character,
+ mk_vector,
+ mk_foreign_func,
+ mk_foreign_object,
+ get_foreign_object_vtable,
+ get_foreign_object_data,
+ putstr,
+ putcharacter,
+
+ is_string,
+ string_value,
+ is_number,
+ nvalue,
+ ivalue,
+ rvalue,
+ is_integer,
+ is_real,
+ is_character,
+ charvalue,
+ is_list,
+ is_vector,
+ list_length,
+ ivalue,
+ fill_vector,
+ vector_elem,
+ set_vector_elem,
+ is_port,
+ is_pair,
+ pair_car,
+ pair_cdr,
+ set_car,
+ set_cdr,
+
+ is_symbol,
+ symname,
+
+ is_syntax,
+ is_proc,
+ is_foreign,
+ syntaxname,
+ is_closure,
+ is_macro,
+ closure_code,
+ closure_env,
+
+ is_continuation,
+ is_promise,
+ is_environment,
+ is_immutable,
+ setimmutable,
+
+ scheme_load_file,
+ scheme_load_string,
+ port_from_file
+};
+#endif
+
+scheme *scheme_init_new() {
+ scheme *sc=(scheme*)malloc(sizeof(scheme));
+ if(!scheme_init(sc)) {
+ free(sc);
+ return 0;
+ } else {
+ return sc;
+ }
+}
+
+scheme *scheme_init_new_custom_alloc(func_alloc malloc, func_dealloc free) {
+ scheme *sc=(scheme*)malloc(sizeof(scheme));
+ if(!scheme_init_custom_alloc(sc,malloc,free)) {
+ free(sc);
+ return 0;
+ } else {
+ return sc;
+ }
+}
+
+
+int scheme_init(scheme *sc) {
+ return scheme_init_custom_alloc(sc,malloc,free);
+}
+
+int scheme_init_custom_alloc(scheme *sc, func_alloc malloc, func_dealloc free) {
+ int i, n=sizeof(dispatch_table)/sizeof(dispatch_table[0]);
+ pointer x;
+
+#if USE_INTERFACE
+ sc->vptr=&vtbl;
+#endif
+ sc->gensym_cnt=0;
+ sc->malloc=malloc;
+ sc->free=free;
+ sc->sink = &sc->_sink;
+ sc->NIL = &sc->_NIL;
+ sc->T = &sc->_HASHT;
+ sc->F = &sc->_HASHF;
+ sc->EOF_OBJ=&sc->_EOF_OBJ;
+
+ sc->free_cell = &sc->_NIL;
+ sc->fcells = 0;
+ sc->inhibit_gc = GC_ENABLED;
+ sc->reserved_cells = 0;
+#ifndef NDEBUG
+ sc->reserved_lineno = 0;
+#endif
+ sc->no_memory=0;
+ sc->inport=sc->NIL;
+ sc->outport=sc->NIL;
+ sc->save_inport=sc->NIL;
+ sc->loadport=sc->NIL;
+ sc->nesting=0;
+ memset (sc->nesting_stack, 0, sizeof sc->nesting_stack);
+ sc->interactive_repl=0;
+ sc->strbuff = sc->malloc(STRBUFFSIZE);
+ if (sc->strbuff == 0) {
+ sc->no_memory=1;
+ return 0;
+ }
+ sc->strbuff_size = STRBUFFSIZE;
+
+ sc->cell_segments = NULL;
+ if (alloc_cellseg(sc,FIRST_CELLSEGS) != FIRST_CELLSEGS) {
+ sc->no_memory=1;
+ return 0;
+ }
+ sc->gc_verbose = 0;
+ dump_stack_initialize(sc);
+ sc->code = sc->NIL;
+ sc->tracing=0;
+ sc->flags = 0;
+
+ /* init sc->NIL */
+ typeflag(sc->NIL) = (T_NIL | T_ATOM | MARK);
+ car(sc->NIL) = cdr(sc->NIL) = sc->NIL;
+ /* init T */
+ typeflag(sc->T) = (T_BOOLEAN | T_ATOM | MARK);
+ car(sc->T) = cdr(sc->T) = sc->T;
+ /* init F */
+ typeflag(sc->F) = (T_BOOLEAN | T_ATOM | MARK);
+ car(sc->F) = cdr(sc->F) = sc->F;
+ /* init EOF_OBJ */
+ typeflag(sc->EOF_OBJ) = (T_EOF_OBJ | T_ATOM | MARK);
+ car(sc->EOF_OBJ) = cdr(sc->EOF_OBJ) = sc->EOF_OBJ;
+ /* init sink */
+ typeflag(sc->sink) = (T_SINK | T_PAIR | MARK);
+ car(sc->sink) = cdr(sc->sink) = sc->NIL;
+ /* init c_nest */
+ sc->c_nest = sc->NIL;
+
+ sc->oblist = oblist_initial_value(sc);
+ /* init global_env */
+ new_frame_in_env(sc, sc->NIL);
+ sc->global_env = sc->envir;
+ /* init else */
+ x = mk_symbol(sc,"else");
+ new_slot_in_env(sc, x, sc->T);
+
+ assign_syntax(sc, OP_LAMBDA, "lambda");
+ assign_syntax(sc, OP_QUOTE, "quote");
+ assign_syntax(sc, OP_DEF0, "define");
+ assign_syntax(sc, OP_IF0, "if");
+ assign_syntax(sc, OP_BEGIN, "begin");
+ assign_syntax(sc, OP_SET0, "set!");
+ assign_syntax(sc, OP_LET0, "let");
+ assign_syntax(sc, OP_LET0AST, "let*");
+ assign_syntax(sc, OP_LET0REC, "letrec");
+ assign_syntax(sc, OP_COND0, "cond");
+ assign_syntax(sc, OP_DELAY, "delay");
+ assign_syntax(sc, OP_AND0, "and");
+ assign_syntax(sc, OP_OR0, "or");
+ assign_syntax(sc, OP_C0STREAM, "cons-stream");
+ assign_syntax(sc, OP_MACRO0, "macro");
+ assign_syntax(sc, OP_CASE0, "case");
+
+ for(i=0; i<n; i++) {
+ if (dispatch_table[i].name[0] != 0) {
+ assign_proc(sc, (enum scheme_opcodes)i, dispatch_table[i].name);
+ }
+ }
+
+ history_init(sc, 8, 8);
+
+ /* initialization of global pointers to special symbols */
+ sc->LAMBDA = mk_symbol(sc, "lambda");
+ sc->QUOTE = mk_symbol(sc, "quote");
+ sc->QQUOTE = mk_symbol(sc, "quasiquote");
+ sc->UNQUOTE = mk_symbol(sc, "unquote");
+ sc->UNQUOTESP = mk_symbol(sc, "unquote-splicing");
+ sc->FEED_TO = mk_symbol(sc, "=>");
+ sc->COLON_HOOK = mk_symbol(sc,"*colon-hook*");
+ sc->ERROR_HOOK = mk_symbol(sc, "*error-hook*");
+ sc->SHARP_HOOK = mk_symbol(sc, "*sharp-hook*");
+#if USE_COMPILE_HOOK
+ sc->COMPILE_HOOK = mk_symbol(sc, "*compile-hook*");
+#endif
+
+ return !sc->no_memory;
+}
+
+void scheme_set_input_port_file(scheme *sc, FILE *fin) {
+ sc->inport=port_from_file(sc,fin,port_input);
+}
+
+void scheme_set_input_port_string(scheme *sc, char *start, char *past_the_end) {
+ sc->inport=port_from_string(sc,start,past_the_end,port_input);
+}
+
+void scheme_set_output_port_file(scheme *sc, FILE *fout) {
+ sc->outport=port_from_file(sc,fout,port_output);
+}
+
+void scheme_set_output_port_string(scheme *sc, char *start, char *past_the_end) {
+ sc->outport=port_from_string(sc,start,past_the_end,port_output);
+}
+
+void scheme_set_external_data(scheme *sc, void *p) {
+ sc->ext_data=p;
+}
+
+void scheme_deinit(scheme *sc) {
+ struct cell_segment *s;
+ int i;
+
+ sc->oblist=sc->NIL;
+ sc->global_env=sc->NIL;
+ dump_stack_free(sc);
+ sc->envir=sc->NIL;
+ sc->code=sc->NIL;
+ history_free(sc);
+ sc->args=sc->NIL;
+ sc->value=sc->NIL;
+ if(is_port(sc->inport)) {
+ typeflag(sc->inport) = T_ATOM;
+ }
+ sc->inport=sc->NIL;
+ sc->outport=sc->NIL;
+ if(is_port(sc->save_inport)) {
+ typeflag(sc->save_inport) = T_ATOM;
+ }
+ sc->save_inport=sc->NIL;
+ if(is_port(sc->loadport)) {
+ typeflag(sc->loadport) = T_ATOM;
+ }
+ sc->loadport=sc->NIL;
+
+ for(i=0; i<=sc->file_i; i++) {
+ port_clear_location(sc, &sc->load_stack[i]);
+ }
+
+ sc->gc_verbose=0;
+ gc(sc,sc->NIL,sc->NIL);
+
+ for (s = sc->cell_segments; s; s = _dealloc_cellseg(sc, s)) {
+ /* nop */
+ }
+ sc->free(sc->strbuff);
+}
+
+void scheme_load_file(scheme *sc, FILE *fin)
+{ scheme_load_named_file(sc,fin,0); }
+
+void scheme_load_named_file(scheme *sc, FILE *fin, const char *filename) {
+ dump_stack_reset(sc);
+ sc->envir = sc->global_env;
+ sc->file_i=0;
+ sc->load_stack[0].kind=port_input|port_file;
+ sc->load_stack[0].rep.stdio.file=fin;
+ sc->loadport=mk_port(sc,sc->load_stack);
+ sc->retcode=0;
+ if(fin==stdin) {
+ sc->interactive_repl=1;
+ }
+
+ port_init_location(sc, &sc->load_stack[0],
+ (fin != stdin && filename)
+ ? mk_string(sc, filename)
+ : NULL);
+
+ sc->inport=sc->loadport;
+ sc->args = mk_integer(sc,sc->file_i);
+ Eval_Cycle(sc, OP_T0LVL);
+ typeflag(sc->loadport)=T_ATOM;
+ if(sc->retcode==0) {
+ sc->retcode=sc->nesting!=0;
+ }
+
+ port_clear_location(sc, &sc->load_stack[0]);
+}
+
+void scheme_load_string(scheme *sc, const char *cmd) {
+ scheme_load_memory(sc, cmd, strlen(cmd), NULL);
+}
+
+void scheme_load_memory(scheme *sc, const char *buf, size_t len, const char *filename) {
+ dump_stack_reset(sc);
+ sc->envir = sc->global_env;
+ sc->file_i=0;
+ sc->load_stack[0].kind=port_input|port_string;
+ sc->load_stack[0].rep.string.start = (char *) buf; /* This func respects const */
+ sc->load_stack[0].rep.string.past_the_end = (char *) buf + len;
+ sc->load_stack[0].rep.string.curr = (char *) buf;
+ port_init_location(sc, &sc->load_stack[0], filename ? mk_string(sc, filename) : NULL);
+ sc->loadport=mk_port(sc,sc->load_stack);
+ sc->retcode=0;
+ sc->interactive_repl=0;
+ sc->inport=sc->loadport;
+ sc->args = mk_integer(sc,sc->file_i);
+ Eval_Cycle(sc, OP_T0LVL);
+ typeflag(sc->loadport)=T_ATOM;
+ if(sc->retcode==0) {
+ sc->retcode=sc->nesting!=0;
+ }
+
+ port_clear_location(sc, &sc->load_stack[0]);
+}
+
+void scheme_define(scheme *sc, pointer envir, pointer symbol, pointer value) {
+ pointer x;
+ pointer *sslot;
+ x = find_slot_spec_in_env(sc, envir, symbol, 0, &sslot);
+ if (x != sc->NIL) {
+ set_slot_in_env(sc, x, value);
+ } else {
+ new_slot_spec_in_env(sc, symbol, value, sslot);
+ }
+}
+
+#if !STANDALONE
+void scheme_register_foreign_func(scheme * sc, scheme_registerable * sr)
+{
+ scheme_define(sc,
+ sc->global_env,
+ mk_symbol(sc,sr->name),
+ mk_foreign_func(sc, sr->f));
+}
+
+void scheme_register_foreign_func_list(scheme * sc,
+ scheme_registerable * list,
+ int count)
+{
+ int i;
+ for(i = 0; i < count; i++)
+ {
+ scheme_register_foreign_func(sc, list + i);
+ }
+}
+
+pointer scheme_apply0(scheme *sc, const char *procname)
+{ return scheme_eval(sc, cons(sc,mk_symbol(sc,procname),sc->NIL)); }
+
+void save_from_C_call(scheme *sc)
+{
+ pointer saved_data =
+ cons(sc,
+ car(sc->sink),
+ cons(sc,
+ sc->envir,
+ sc->dump));
+ /* Push */
+ sc->c_nest = cons(sc, saved_data, sc->c_nest);
+ /* Truncate the dump stack so TS will return here when done, not
+ directly resume pre-C-call operations. */
+ dump_stack_reset(sc);
+}
+void restore_from_C_call(scheme *sc)
+{
+ car(sc->sink) = caar(sc->c_nest);
+ sc->envir = cadar(sc->c_nest);
+ sc->dump = cdr(cdar(sc->c_nest));
+ /* Pop */
+ sc->c_nest = cdr(sc->c_nest);
+}
+
+/* "func" and "args" are assumed to be already eval'ed. */
+pointer scheme_call(scheme *sc, pointer func, pointer args)
+{
+ int old_repl = sc->interactive_repl;
+ sc->interactive_repl = 0;
+ save_from_C_call(sc);
+ sc->envir = sc->global_env;
+ sc->args = args;
+ sc->code = func;
+ sc->retcode = 0;
+ Eval_Cycle(sc, OP_APPLY);
+ sc->interactive_repl = old_repl;
+ restore_from_C_call(sc);
+ return sc->value;
+}
+
+pointer scheme_eval(scheme *sc, pointer obj)
+{
+ int old_repl = sc->interactive_repl;
+ sc->interactive_repl = 0;
+ save_from_C_call(sc);
+ sc->args = sc->NIL;
+ sc->code = obj;
+ sc->retcode = 0;
+ Eval_Cycle(sc, OP_EVAL);
+ sc->interactive_repl = old_repl;
+ restore_from_C_call(sc);
+ return sc->value;
+}
+
+
+#endif
+
+/* ========== Main ========== */
+
+#if STANDALONE
+
+#if defined(__APPLE__) && !defined (OSX)
+int main()
+{
+ extern MacTS_main(int argc, char **argv);
+ char** argv;
+ int argc = ccommand(&argv);
+ MacTS_main(argc,argv);
+ return 0;
+}
+int MacTS_main(int argc, char **argv) {
+#else
+int main(int argc, char **argv) {
+#endif
+ scheme sc;
+ FILE *fin;
+ char *file_name=InitFile;
+ int retcode;
+ int isfile=1;
+
+ if(argc==1) {
+ printf(banner);
+ }
+ if(argc==2 && strcmp(argv[1],"-?")==0) {
+ printf("Usage: tinyscheme -?\n");
+ printf("or: tinyscheme [<file1> <file2> ...]\n");
+ printf("followed by\n");
+ printf(" -1 <file> [<arg1> <arg2> ...]\n");
+ printf(" -c <Scheme commands> [<arg1> <arg2> ...]\n");
+ printf("assuming that the executable is named tinyscheme.\n");
+ printf("Use - as filename for stdin.\n");
+ return 1;
+ }
+ if(!scheme_init(&sc)) {
+ fprintf(stderr,"Could not initialize!\n");
+ return 2;
+ }
+ scheme_set_input_port_file(&sc, stdin);
+ scheme_set_output_port_file(&sc, stdout);
+#if USE_DL
+ scheme_define(&sc,sc.global_env,mk_symbol(&sc,"load-extension"),mk_foreign_func(&sc, scm_load_ext));
+#endif
+ argv++;
+ if(access(file_name,0)!=0) {
+ char *p=getenv("TINYSCHEMEINIT");
+ if(p!=0) {
+ file_name=p;
+ }
+ }
+ do {
+ if(strcmp(file_name,"-")==0) {
+ fin=stdin;
+ } else if(strcmp(file_name,"-1")==0 || strcmp(file_name,"-c")==0) {
+ pointer args=sc.NIL;
+ isfile=file_name[1]=='1';
+ file_name=*argv++;
+ if(strcmp(file_name,"-")==0) {
+ fin=stdin;
+ } else if(isfile) {
+ fin=fopen(file_name,"r");
+ }
+ for(;*argv;argv++) {
+ pointer value=mk_string(&sc,*argv);
+ args=cons(&sc,value,args);
+ }
+ args=reverse_in_place(&sc,sc.NIL,args);
+ scheme_define(&sc,sc.global_env,mk_symbol(&sc,"*args*"),args);
+
+ } else {
+ fin=fopen(file_name,"r");
+ }
+ if(isfile && fin==0) {
+ fprintf(stderr,"Could not open file %s\n",file_name);
+ } else {
+ if(isfile) {
+ scheme_load_named_file(&sc,fin,file_name);
+ } else {
+ scheme_load_string(&sc,file_name);
+ }
+ if(!isfile || fin!=stdin) {
+ if(sc.retcode!=0) {
+ fprintf(stderr,"Errors encountered reading %s\n",file_name);
+ }
+ if(isfile) {
+ fclose(fin);
+ }
+ }
+ }
+ file_name=*argv++;
+ } while(file_name!=0);
+ if(argc==1) {
+ scheme_load_named_file(&sc,stdin,0);
+ }
+ retcode=sc.retcode;
+ scheme_deinit(&sc);
+
+ return retcode;
+}
+
+#endif
+
+/*
+Local variables:
+c-file-style: "k&r"
+End:
+*/
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-31 22:21:00 +0000