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boot-eval.c
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boot-eval.c
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#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <stdarg.h>
#include <stdlib.h>
#include <sys/types.h>
#include <assert.h>
extern int isatty(int);
#define GC_APP_HEADER int type;
struct GC_StackRoot
{
void **root;
struct GC_StackRoot *next;
#if !defined(NDEBUG)
int live;
const char *name;
const char *file;
long line;
#endif
};
#if defined(NDEBUG)
# define GC_PROTECT(V) struct GC_StackRoot _sr_##V; _sr_##V.root= (void *)&V; GC_push_root(&_sr_##V)
# define GC_UNPROTECT(V) GC_pop_root(&_sr_##V)
#else
# define GC_PROTECT(V) struct GC_StackRoot _sr_##V; _sr_##V.root= (void *)&V; GC_push_root(&_sr_##V, #V, __FILE__, __LINE__)
# define GC_UNPROTECT(V) GC_pop_root(&_sr_##V, #V, __FILE__, __LINE__)
#endif
#define GC_INIT()
#define GC_init()
#if !defined(GC_API)
# define GC_API
#endif
GC_API void *GC_malloc(size_t nbytes);
GC_API void *GC_malloc_atomic(size_t nbytes);
GC_API void *GC_realloc(void *ptr, size_t lbs);
GC_API void GC_free(void *ptr);
GC_API size_t GC_size(void *ptr);
GC_API void GC_add_root(void *root);
GC_API void GC_delete_root(void *root);
GC_API void GC_mark(void *ptr);
GC_API void GC_mark_leaf(void *ptr);
GC_API void GC_sweep(void);
GC_API void GC_gcollect(void);
GC_API size_t GC_count_objects(void);
GC_API size_t GC_count_bytes(void);
GC_API double GC_count_fragments(void);
GC_API int GC_atomic(void *ptr);
#ifndef NDEBUG
GC_API void *GC_check(void *ptr);
GC_API void *GC_stamp(void *ptr, const char *file, long line, const char *func);
GC_API const char *GC_file(void *ptr);
GC_API long GC_line(void *ptr);
GC_API const char *GC_function(void *ptr);
#else
# define GC_check(PTR) (PTR)
# define GC_stamp(PTR, FILE, LINE, FUNC) (PTR)
# define GC_file(PTR) "?"
# define GC_line(PTR) 0
# define GC_function(PTR) "?"
#endif
typedef void (*GC_finaliser_t)(void *ptr, void *data);
GC_API void GC_register_finaliser(void *ptr, GC_finaliser_t finaliser, void *data);
extern struct GC_StackRoot *GC_stack_roots;
#if defined(NDEBUG)
GC_API inline void GC_push_root(struct GC_StackRoot *sr)
{
sr->next= GC_stack_roots;
GC_stack_roots= sr;
}
GC_API inline void GC_pop_root(struct GC_StackRoot *sr)
{
# if 0
GC_stack_roots= sr->next;
# else /* paranoid version for broken code warns of mismatched pops with a SEGV */
struct GC_StackRoot *nr= sr->next;
while (nr != GC_stack_roots) GC_stack_roots= GC_stack_roots->next;
# endif
}
#else
GC_API inline void GC_push_root(struct GC_StackRoot *sr, const char *name, const char *file, int line)
{
sr->next= GC_stack_roots;
sr->name= name;
sr->file= file;
sr->line= line;
sr->live= 1;
GC_stack_roots= sr;
}
static int GC_roots_include(struct GC_StackRoot *roots, struct GC_StackRoot *root)
{
while (roots) {
if (roots == root) return 1;
roots= roots->next;
}
return 0;
}
GC_API inline void GC_pop_root(struct GC_StackRoot *sr, const char *name, const char *file, int line)
{
struct GC_StackRoot *nr= sr->next;
struct GC_StackRoot *gr= GC_stack_roots;
if (!sr->live) { fprintf(stderr, "*** %s %d %s: STALE POP IN GC_pop_root\n", file, line, name); goto die; }
sr->live= 0;
if (GC_roots_include(nr, sr)) { fprintf(stderr, "*** %s %d %s: CYCLE IN GC_pop_root\n", file, line, name); goto die; }
int n= 0;
while (nr != gr) {
if (n++ > 10) { fprintf(stderr, "*** %s %d %s: LOOP IN GC_pop_root\n", file, line, name); goto die; }
gr= gr->next;
}
GC_stack_roots= gr;
return;
die:
fprintf(stderr, "* gc stack roots = %p %s %ld %s\n", gr, gr->file, gr->line, gr->name);
fprintf(stderr, "* popped root = %p %s %ld %s\n", sr, sr->file, sr->line, sr->name);
while (nr) {
fprintf(stderr, "* next root = %p %s %ld %s\n", nr, nr ? nr->file : 0, nr ? nr->line : 0, nr ? nr->name : 0);
nr= nr->next;
}
abort();
}
#endif
typedef void (*GC_pre_mark_function_t)(void);
extern GC_pre_mark_function_t GC_pre_mark_function;
typedef void (*GC_mark_function_t)(void *ptr);
extern GC_mark_function_t GC_mark_function;
typedef void (*GC_free_function_t)(void *ptr);
extern GC_free_function_t GC_free_function;
#define GC_ALIGN sizeof(long)
#define GC_MEMORY 0x7fffffff
#define GC_QUANTUM 50*1024
#if defined(DEBUGGC)
# define ALLOCS_PER_GC 1
#else
# define ALLOCS_PER_GC 32768
#endif
#define VERBOSE 0
#define BITS_PER_WORD (sizeof(long) * 8)
typedef struct _gcheader
{
unsigned long size : BITS_PER_WORD - 8 __attribute__((__packed__));
union {
unsigned int flags : 3;
struct {
unsigned int used : 1;
unsigned int atom : 1;
unsigned int mark : 1;
} __attribute__((__packed__));
} __attribute__((__packed__));
struct _gcheader *next;
struct _gcfinaliser *finalisers;
#ifndef NDEBUG
const char *file;
long line;
const char *func;
#endif
#if defined(GC_APP_HEADER)
GC_APP_HEADER
#endif
} gcheader;
static inline void *hdr2ptr(gcheader *hdr) { return (void *)(hdr + 1); }
static inline gcheader *ptr2hdr(void *ptr) { return (gcheader *)ptr - 1; }
#ifndef NDEBUG
GC_API void *GC_stamp(void *ptr, const char *file, long line, const char *func)
{
gcheader *hdr= ptr2hdr(ptr);
hdr->file= file;
hdr->line= line;
hdr->func= func;
return ptr;
}
GC_API const char *GC_file(void *ptr) { return ptr2hdr(ptr)->file; }
GC_API long GC_line(void *ptr) { return ptr2hdr(ptr)->line; }
GC_API const char *GC_function(void *ptr) { return ptr2hdr(ptr)->func; }
#endif
typedef struct _gcfinaliser
{
void *ptr;
GC_finaliser_t finaliser;
void *data;
struct _gcfinaliser *next;
} gcfinaliser;
static gcheader gcbase= { 0, { -1 }, &gcbase };
static gcheader *gcnext= &gcbase;
static size_t gcQuantum= GC_QUANTUM;
static int gcCount= ALLOCS_PER_GC;
static int gcAllocs= ALLOCS_PER_GC;
static size_t gcMemory= GC_MEMORY;
static gcfinaliser *finalisable= 0;
GC_API void *GC_malloc(size_t lbs)
{
gcheader *hdr, *org;
size_t split;
if ((!--gcAllocs) || (gcMemory < lbs)) {
//fprintf(stderr, "%i %lu %ld\t", gcAllocs, gcMemory, lbs);
# if VERBOSE >= 1
if (gcAllocs > 0) fprintf(stderr, "GC: heap full after %i allocations\n", gcCount - gcAllocs);
# endif
gcAllocs= gcCount;
GC_gcollect();
//fprintf(stderr, "GC %i %lu %ld\n", gcAllocs, gcMemory, lbs);
if (gcMemory < lbs) goto full;
}
org= hdr= gcnext;
lbs= (lbs + GC_ALIGN-1) & ~(GC_ALIGN-1);
#if VERBOSE > 1
fprintf(stderr, "malloc %i\n", (int)lbs);
#endif
again:
#if VERBOSE > 4
{
gcheader *h= gcnext;
do {
fprintf(stderr, " %2d %p -> %p = %i\n", h->flags, h, h->next, (int)h->size);
h= h->next;
} while (h != gcnext);
}
#endif
split= lbs + sizeof(gcheader) + GC_ALIGN;
do {
# if VERBOSE > 3
fprintf(stderr, "? %2d %p -> %p = %i\n", hdr->flags, hdr, hdr->next, (int)hdr->size);
# endif
if (!hdr->used) {
while ((!hdr->next->used) && (hdr2ptr(hdr) + hdr->size == hdr->next)) {
hdr->size += sizeof(gcheader) + hdr->next->size;
hdr->next= hdr->next->next;
}
if ((hdr->size >= split) || (hdr->size == lbs))
{
void *mem;
if (hdr->size >= split)
{
gcheader *ins= (gcheader *)(hdr2ptr(hdr) + lbs);
ins->flags= 0;
ins->next= hdr->next;
ins->size= hdr->size - lbs - sizeof(gcheader);
hdr->next= ins;
hdr->size= lbs;
}
hdr->used= 1;
hdr->finalisers= 0;
gcnext= hdr->next;
mem= hdr2ptr(hdr);
# if VERBOSE > 2
//if ((long)hdr == 0x800248) abort();
fprintf(stderr, "MALLOC %p -> %p + %i\n", mem, hdr, (int)GC_size(mem));
# endif
memset(mem, 0, hdr->size);
gcMemory -= hdr->size;
//if (mem == (void *)0x617190) { fprintf(stderr, "ALLOCATING %p\n", mem); bkpt(); }
return mem;
}
}
hdr= hdr->next;
} while (hdr != org);
{
size_t incr= gcQuantum;
size_t req= sizeof(gcheader) + lbs;
while (incr <= req) incr *= 2;
//fprintf(stderr, "extending by %ld => %ld @ %d\n", req, incr, (int)(gcCount - gcAllocs));
hdr= (gcheader *)malloc(incr);
//fprintf(stderr, "buffer at %x\n", (int)hdr);
if (hdr != (gcheader *)-1)
{
hdr->flags= 0;
hdr->next= gcbase.next;
gcbase.next= hdr;
hdr->size= incr - sizeof(gcheader);
#if VERBOSE
fprintf(stderr, "extend by %i at %p\n", (int)hdr->size, hdr);
#endif
goto again;
}
fprintf(stderr, "GC: sbrk failed\n");
}
full:
fprintf(stderr, "GC: out of memory\n");
abort();
return 0;
}
GC_API void *GC_malloc_atomic(size_t lbs)
{
void *mem= GC_malloc(lbs);
ptr2hdr(mem)->atom= 1;
return mem;
}
GC_API void *GC_realloc(void *ptr, size_t lbs)
{
gcheader *hdr= ptr2hdr(ptr);
void *mem;
if (lbs <= hdr->size) return ptr;
mem= GC_malloc(lbs);
memcpy(mem, ptr, hdr->size);
ptr2hdr(mem)->atom= hdr->atom;
GC_free(ptr);
return mem;
}
static gcheader *GC_freeHeader(gcheader *hdr)
{
#if VERBOSE > 2
fprintf(stderr, "FREE %p -> %p %s:%ld %s\n", hdr2ptr(hdr), hdr, hdr->file, hdr->line, hdr->func);
if (hdr->line == 0) {
fflush(stdout);
abort();
}
#endif
hdr->flags= 0;
gcMemory += hdr->size;
return hdr;
}
GC_API void GC_free(void *ptr)
{
gcnext= GC_freeHeader(ptr2hdr(ptr));
}
GC_API size_t GC_size(void *ptr)
{
return ptr2hdr(ptr)->size;
}
GC_API void GC_default_pre_mark_function(void) {}
GC_pre_mark_function_t GC_pre_mark_function= GC_default_pre_mark_function;
GC_API void GC_default_mark_function(void *ptr)
{
gcheader *hdr= ptr2hdr(ptr);
void **pos= ptr;
void **lim= hdr2ptr(hdr) + hdr->size - sizeof(void *);
while (pos <= lim)
{
void *field= *pos;
if (field && !((long)field & 1))
GC_mark(field);
++pos;
}
}
GC_mark_function_t GC_mark_function= GC_default_mark_function;
GC_API void GC_mark(void *ptr)
{
if ((long)ptr & 1) return;
gcheader *hdr= ptr2hdr(ptr);
#if VERBOSE > 3
fprintf(stderr, "mark? %p -> %p used %d atom %d mark %d\n", ptr, hdr, hdr->used, hdr->atom, hdr->mark);
#endif
if (!hdr->mark) {
hdr->mark= 1;
if (!hdr->atom)
GC_mark_function(ptr);
}
}
GC_API void GC_mark_leaf(void *ptr)
{
ptr2hdr(ptr)->mark= 1;
}
GC_free_function_t GC_free_function= 0;
GC_API void GC_sweep(void)
{
gcheader *hdr= gcbase.next;
do {
#if VERBOSE > 3
fprintf(stderr, "sweep? %p %d\n", hdr, hdr->flags);
#endif
if (hdr->flags)
{
if (hdr->mark)
hdr->mark= 0;
else {
if (hdr->finalisers) {
while (hdr->finalisers) {
gcfinaliser *gcf= hdr->finalisers;
hdr->finalisers= gcf->next;
gcf->next= finalisable;
finalisable= gcf;
}
}
else {
if (GC_free_function) GC_free_function(hdr2ptr(hdr));
hdr= GC_freeHeader(hdr);
}
}
}
hdr= hdr->next;
} while (hdr != &gcbase);
gcnext= gcbase.next;
while (finalisable)
{
gcfinaliser *gcf= finalisable;
gcf->finaliser(gcf->ptr, gcf->data);
finalisable= gcf->next;
free(gcf);
}
}
static void ***roots= 0;
static size_t numRoots= 0;
static size_t maxRoots= 0;
struct GC_StackRoot *GC_stack_roots= 0;
GC_API void GC_add_root(void *root)
{
if (numRoots == maxRoots)
roots= maxRoots
? realloc(roots, sizeof(roots[0]) * (maxRoots *= 2))
: malloc ( sizeof(roots[0]) * (maxRoots= 128));
roots[numRoots++]= (void **)root;
assert(root);
}
GC_API void GC_delete_root(void *root)
{
int i;
for (i= 0; i < numRoots; ++i)
if (roots[i] == (void **)root)
break;
if (i < numRoots)
{
memmove(roots + i, roots + i + 1, sizeof(roots[0]) * (numRoots - i));
--numRoots;
}
}
GC_API long GC_collections= 0;
GC_API void GC_gcollect(void)
{
int i;
struct GC_StackRoot *sr;
++GC_collections;
#if !defined(NDEBUG)
{
# undef static
static char *cursors= "-/|\\";
static int cursor= 0;
if (GC_collections % 100 == 0) {
if (0 == cursors[cursor]) cursor= 0;
fprintf(stderr, "%c\010", cursors[cursor]);
++cursor;
}
# if (NONSTATIC)
# define static
# endif
}
#endif
GC_pre_mark_function();
#if VERBOSE >= 1
fprintf(stderr, "*** GC: mark roots\n");
#endif
for (i= 0; i < numRoots; ++i)
if (*roots[i]) {
# if VERBOSE >= 2
fprintf(stderr, "*** GC: root %i *%p -> %p\n", i, roots[i], *roots[i]);
# endif
GC_mark(*roots[i]);
}
#if VERBOSE > 0
fprintf(stderr, "*** GC: mark stack\n");
#endif
for (sr= GC_stack_roots; sr; sr= sr->next) {
#if VERBOSE > 2 && defined(DEBUGGC)
fprintf(stderr, "*** GC: stack root %p %s %s:%ld\n", *sr->root, sr->name, sr->file, sr->line);
#endif
if (*(sr->root)) GC_mark(*(sr->root));
}
#if VERBOSE > 0
fprintf(stderr, "*** GC: sweep\n");
#endif
GC_sweep();
#if VERBOSE > 0
fprintf(stderr, "*** GC: done\n");
#endif
}
GC_API size_t GC_count_objects(void)
{
gcheader *hdr= gcbase.next;
size_t count= 0;
do {
if (hdr->used)
++count;
hdr= hdr->next;
} while (hdr != &gcbase);
return count;
}
GC_API size_t GC_count_bytes(void)
{
gcheader *hdr= gcbase.next;
size_t count= 0;
do {
if (hdr->used)
count += hdr->size;
hdr= hdr->next;
} while (hdr != &gcbase);
return count;
}
GC_API double GC_count_fragments(void)
{
gcheader *hdr= gcbase.next;
size_t used= 0;
size_t free= 0;
do {
if (hdr->used) {
++used;
//printf("%p\t%7d\n", hdr, (int)hdr->size);
}
else {
while ((!hdr->next->used) && (hdr2ptr(hdr) + hdr->size == hdr->next)) {
hdr->size += sizeof(gcheader) + hdr->next->size;
hdr->next= hdr->next->next;
}
++free;
//printf("%p\t\t%7d\n", hdr, (int)hdr->size);
}
hdr= hdr->next;
} while (hdr != &gcbase);
return (double)free / (double)used;
}
GC_API int GC_atomic(void *ptr)
{
return ptr2hdr(ptr)->atom;
}
#ifndef NDEBUG
GC_API void *GC_check(void *ptr)
{
gcheader *hdr= ptr2hdr(ptr);
if (!hdr->used) {
hdr->used= 1;
printf("accessible dead object %p %s:%ld %s\n", ptr, hdr->file, hdr->line, hdr->func);
}
return ptr;
}
#endif
GC_API void GC_register_finaliser(void *ptr, GC_finaliser_t finaliser, void *data)
{
gcheader *gch = ptr2hdr(ptr);
gcfinaliser *gcf = (struct _gcfinaliser *)malloc(sizeof(struct _gcfinaliser));
gcf->ptr = ptr;
gcf->finaliser = finaliser;
gcf->data = data;
gcf->next = gch->finalisers;
gch->finalisers = gcf;
}
struct buffer
{
char *buffer;
int size;
int position;
};
#define BUFFER_INITIALISER { 0, 0, 0 }
static void buffer_reset(struct buffer *b) { b->position= 0; }
static void buffer_append(struct buffer *b, int c)
{
if (b->position == b->size)
b->buffer= b->buffer
? realloc(b->buffer, b->size *= 2)
: malloc(b->size= 32);
b->buffer[b->position++]= c;
}
static void buffer_appendAll(struct buffer *b, const char *s)
{
while (*s) buffer_append(b, *s++);
}
static char *buffer_contents(struct buffer *b)
{
buffer_append(b, 0);
b->position--;
return b->buffer;
}
union Object;
typedef union Object *oop;
typedef oop (*imp_t)(oop args, oop env);
#define nil ((oop)0)
enum { Undefined, Long, String, Symbol, Pair, _Array, Array, Expr, Form, Fixed, Subr };
struct Long { long bits; };
struct String { oop size; char *bits; };
struct Symbol { char *bits; };
struct Pair { oop head, tail; };
struct Array { oop _array; };
struct Expr { oop defn, env; };
struct Form { oop function; };
struct Fixed { oop function; };
struct Subr { imp_t imp; char *name; };
union Object {
struct Long Long;
struct String String;
struct Symbol Symbol;
struct Pair Pair;
struct Array Array;
struct Expr Expr;
struct Form Form;
struct Fixed Fixed;
struct Subr Subr;
};
static void fatal(char *reason, ...);
#define setType(OBJ, TYPE) (ptr2hdr(OBJ)->type= (TYPE))
static inline int getType(oop obj) { return obj ? ptr2hdr(obj)->type : Undefined; }
#define is(TYPE, OBJ) ((OBJ) && (TYPE == getType(OBJ)))
#if defined(NDEBUG)
# define checkType(OBJ, TYPE) OBJ
#else
# define checkType(OBJ, TYPE) _checkType(OBJ, TYPE, #TYPE, __FILE__, __LINE__)
static inline oop _checkType(oop obj, int type, char *name, char *file, int line)
{
if (obj && !ptr2hdr(obj)->used) fatal("%s:%i: attempt to access dead object %s\n", file, line, name);
if (!is(type, obj)) fatal("%s:%i: typecheck failed for %s (%i != %i)\n", file, line, name, type, getType(obj));
return obj;
}
#endif
#define get(OBJ, TYPE, FIELD) (checkType(OBJ, TYPE)->TYPE.FIELD)
#define set(OBJ, TYPE, FIELD, VALUE) (checkType(OBJ, TYPE)->TYPE.FIELD= (VALUE))
#define getHead(OBJ) get(OBJ, Pair,head)
#define getTail(OBJ) get(OBJ, Pair,tail)
#define setHead(OBJ, VAL) set(OBJ, Pair,head, VAL)
#define setTail(OBJ, VAL) set(OBJ, Pair,tail, VAL)
#define getLong(X) get((X), Long,bits)
static oop car(oop obj) { return is(Pair, obj) ? getHead(obj) : nil; }
static oop cdr(oop obj) { return is(Pair, obj) ? getTail(obj) : nil; }
static oop caar(oop obj) { return car(car(obj)); }
static oop cadr(oop obj) { return car(cdr(obj)); }
static oop cddr(oop obj) { return cdr(cdr(obj)); }
//static oop caaar(oop obj) { return car(car(car(obj))); }
//static oop cadar(oop obj) { return car(cdr(car(obj))); }
//static oop caddr(oop obj) { return car(cdr(cdr(obj))); }
//static oop cadddr(oop obj) { return car(cdr(cdr(cdr(obj)))); }
#define newBits(TYPE) _newBits(TYPE, sizeof(struct TYPE))
#define newOops(TYPE) _newOops(TYPE, sizeof(struct TYPE))
static oop _newBits(int type, size_t size) { oop obj= GC_malloc_atomic(size); setType(obj, type); return obj; }
static oop _newOops(int type, size_t size) { oop obj= GC_malloc(size); setType(obj, type); return obj; }
static oop symbols= nil;
static oop s_set= nil, s_quote= nil, s_lambda= nil, s_let= nil, s_quasiquote= nil, s_unquote= nil, s_unquote_splicing= nil, s_t= nil, s_dot= nil;
static oop f_lambda= nil, f_let= nil, f_quote= nil, f_set= nil;
static oop globals= nil, expanders= nil, encoders= nil, evaluators= nil, applicators= nil;
static oop backtrace= nil;
static int opt_v= 0;
static oop newLong(long bits) { oop obj= newBits(Long); set(obj, Long,bits, bits); return obj; }
static oop _newString(size_t len)
{
char *gstr= GC_malloc_atomic(len + 1); GC_PROTECT(gstr); /* + 1 to ensure null terminator */
oop obj= newOops(String); GC_PROTECT(obj);
set(obj, String,size, newLong(len)); GC_UNPROTECT(obj);
set(obj, String,bits, gstr); GC_UNPROTECT(gstr);
return obj;
}
static oop newString(char *cstr)
{
size_t len= strlen(cstr);
oop obj= _newString(len);
memcpy(get(obj, String,bits), cstr, len);
return obj;
}
static int stringLength(oop string)
{
return getLong(get(string, String,size));
}
static oop newSymbol(char *cstr) { oop obj= newBits(Symbol); set(obj, Symbol,bits, strdup(cstr)); return obj; }
static oop newPair(oop head, oop tail) { oop obj= newOops(Pair); set(obj, Pair,head, head); set(obj, Pair,tail, tail); return obj; }
static oop newArray(int tally)
{
oop elts= _newOops(_Array, sizeof(oop) * tally); GC_PROTECT(elts);
oop obj= newOops( Array); GC_UNPROTECT(elts);
set(obj, Array,_array, elts);
return obj;
}
static int arrayLength(oop obj)
{
if (is(Array, obj))
return GC_size(get(obj, Array,_array)) / sizeof(oop);
return 0;
}
static oop oopAt(oop obj, int index)
{
if (obj) {
if (!GC_atomic(obj)) {
int size= GC_size(obj) / sizeof(oop);
if ((unsigned)index < (unsigned)size) return ((oop *)obj)[index];
}
}
return nil;
}
static oop oopAtPut(oop obj, int index, oop value)
{
if (!GC_atomic(obj)) {
int size= GC_size(obj) / sizeof(oop);
if ((unsigned)index < (unsigned)size) return ((oop *)obj)[index]= value;
}
return nil;
}
static oop arrayAt(oop array, int index)
{
if (is(Array, array)) {
oop elts= get(array, Array,_array);
int size= GC_size(elts) / sizeof(oop);
if ((unsigned)index < (unsigned)size)
return ((oop *)elts)[index];
}
return nil;
}
static oop arrayAtPut(oop array, int index, oop val)
{
if (is(Array, array)) {
oop elts= get(array, Array,_array);
int size= GC_size(elts) / sizeof(oop);
if ((unsigned)index >= (unsigned)size) {
oop oops= _newOops(_Array, sizeof(oop) * (index + 1));
memcpy((oop *)oops, (oop *)elts, size * sizeof(oop));
elts= set(array, Array,_array, oops);
}
return ((oop *)elts)[index]= val;
}
return nil;
}
static oop newExpr(oop defn, oop env) { oop obj= newOops(Expr); set(obj, Expr,defn, defn); set(obj, Expr,env, env); return obj; }
static oop newForm(oop function) { oop obj= newOops(Form); set(obj, Form,function, function); return obj; }
static oop newFixed(oop function) { oop obj= newOops(Fixed); set(obj, Fixed,function, function); return obj; }
static oop newSubr(imp_t imp, char *name)
{
oop obj= newBits(Subr);
set(obj, Subr,imp, imp);
set(obj, Subr,name, name);
return obj;
}
static oop newBool(int b) { return b ? s_t : nil; }
static oop intern(char *cstr)
{
oop list= nil;
for (list= symbols; is(Pair, list); list= getTail(list)) {
oop sym= getHead(list);
if (!strcmp(cstr, get(sym, Symbol,bits))) return sym;
}
oop sym= nil;
GC_PROTECT(sym);
sym= newSymbol(cstr);
symbols= newPair(sym, symbols);
GC_UNPROTECT(sym);
return sym;
}
#define CHAR_PRINT (1<<0)
#define CHAR_BLANK (1<<1)
#define CHAR_ALPHA (1<<2)
#define CHAR_DIGIT10 (1<<3)
#define CHAR_DIGIT16 (1<<4)
#define CHAR_LETTER (1<<5)
static char chartab[]= {
/* 00 nul */ 0,
/* 01 soh */ 0,
/* 02 stx */ 0,
/* 03 etx */ 0,
/* 04 eot */ 0,
/* 05 enq */ 0,
/* 06 ack */ 0,
/* 07 bel */ 0,
/* 08 bs */ 0,
/* 09 ht */ 0,
/* 0a nl */ CHAR_PRINT | CHAR_BLANK,
/* 0b vt */ 0,
/* 0c np */ CHAR_PRINT | CHAR_BLANK,
/* 0d cr */ CHAR_PRINT | CHAR_BLANK,
/* 0e so */ 0,
/* 0f si */ 0,
/* 10 dle */ 0,
/* 11 dc1 */ 0,
/* 12 dc2 */ 0,
/* 13 dc3 */ 0,
/* 14 dc4 */ 0,
/* 15 nak */ 0,
/* 16 syn */ 0,
/* 17 etb */ 0,
/* 18 can */ 0,
/* 19 em */ 0,
/* 1a sub */ 0,
/* 1b esc */ 0,
/* 1c fs */ 0,
/* 1d gs */ 0,
/* 1e rs */ 0,
/* 1f us */ 0,
/* 20 sp */ CHAR_PRINT | CHAR_BLANK,
/* 21 ! */ CHAR_PRINT | CHAR_LETTER,
/* 22 " */ CHAR_PRINT | CHAR_PRINT,
/* 23 # */ CHAR_PRINT | CHAR_LETTER,
/* 24 $ */ CHAR_PRINT | CHAR_LETTER,
/* 25 % */ CHAR_PRINT | CHAR_LETTER,
/* 26 & */ CHAR_PRINT | CHAR_LETTER,
/* 27 ' */ CHAR_PRINT,
/* 28 ( */ CHAR_PRINT,
/* 29 ) */ CHAR_PRINT,
/* 2a * */ CHAR_PRINT | CHAR_LETTER,
/* 2b + */ CHAR_PRINT | CHAR_LETTER,
/* 2c , */ CHAR_PRINT | CHAR_LETTER,
/* 2d - */ CHAR_PRINT | CHAR_LETTER,
/* 2e . */ CHAR_PRINT | CHAR_LETTER,
/* 2f / */ CHAR_PRINT | CHAR_LETTER,
/* 30 0 */ CHAR_PRINT | CHAR_DIGIT10 | CHAR_DIGIT16,
/* 31 1 */ CHAR_PRINT | CHAR_DIGIT10 | CHAR_DIGIT16,
/* 32 2 */ CHAR_PRINT | CHAR_DIGIT10 | CHAR_DIGIT16,
/* 33 3 */ CHAR_PRINT | CHAR_DIGIT10 | CHAR_DIGIT16,
/* 34 4 */ CHAR_PRINT | CHAR_DIGIT10 | CHAR_DIGIT16,
/* 35 5 */ CHAR_PRINT | CHAR_DIGIT10 | CHAR_DIGIT16,
/* 36 6 */ CHAR_PRINT | CHAR_DIGIT10 | CHAR_DIGIT16,
/* 37 7 */ CHAR_PRINT | CHAR_DIGIT10 | CHAR_DIGIT16,
/* 38 8 */ CHAR_PRINT | CHAR_DIGIT10 | CHAR_DIGIT16,
/* 39 9 */ CHAR_PRINT | CHAR_DIGIT10 | CHAR_DIGIT16,
/* 3a : */ CHAR_PRINT | CHAR_LETTER,
/* 3b ; */ CHAR_PRINT,
/* 3c < */ CHAR_PRINT | CHAR_LETTER,
/* 3d = */ CHAR_PRINT | CHAR_LETTER,
/* 3e > */ CHAR_PRINT | CHAR_LETTER,
/* 3f ? */ CHAR_PRINT | CHAR_LETTER,
/* 40 @ */ CHAR_PRINT | CHAR_LETTER,
/* 41 A */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA | CHAR_DIGIT16,
/* 42 B */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA | CHAR_DIGIT16,
/* 43 C */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA | CHAR_DIGIT16,
/* 44 D */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA | CHAR_DIGIT16,
/* 45 E */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA | CHAR_DIGIT16,
/* 46 F */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA | CHAR_DIGIT16,
/* 47 G */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 48 H */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 49 I */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 4a J */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 4b K */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 4c L */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 4d M */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 4e N */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 4f O */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 50 P */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 51 Q */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 52 R */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 53 S */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 54 T */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 55 U */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 56 V */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 57 W */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 58 X */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 59 Y */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 5a Z */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 5b [ */ CHAR_PRINT,
/* 5c \ */ CHAR_PRINT | CHAR_LETTER,
/* 5d ] */ CHAR_PRINT,
/* 5e ^ */ CHAR_PRINT | CHAR_LETTER,
/* 5f _ */ CHAR_PRINT | CHAR_LETTER,
/* 60 ` */ CHAR_PRINT,
/* 61 a */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA | CHAR_DIGIT16,
/* 62 b */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA | CHAR_DIGIT16,
/* 63 c */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA | CHAR_DIGIT16,
/* 64 d */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA | CHAR_DIGIT16,
/* 65 e */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA | CHAR_DIGIT16,
/* 66 f */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA | CHAR_DIGIT16,
/* 67 g */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 68 h */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 69 i */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 6a j */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 6b k */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 6c l */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 6d m */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 6e n */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 6f o */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 70 p */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 71 q */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 72 r */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 73 s */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 74 t */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 75 u */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 76 v */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 77 w */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 78 x */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 79 y */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 7a z */ CHAR_PRINT | CHAR_LETTER | CHAR_ALPHA,
/* 7b { */ CHAR_PRINT,
/* 7c | */ CHAR_PRINT | CHAR_LETTER,
/* 7d } */ CHAR_PRINT,
/* 7e ~ */ CHAR_PRINT | CHAR_LETTER,
/* 7f del */ 0,
};
static int isPrint(int c) { return 0 <= c && c <= 127 && (CHAR_PRINT & chartab[c]); }
static int isAlpha(int c) { return 0 <= c && c <= 127 && (CHAR_ALPHA & chartab[c]); }
static int isDigit10(int c) { return 0 <= c && c <= 127 && (CHAR_DIGIT10 & chartab[c]); }
static int isDigit16(int c) { return 0 <= c && c <= 127 && (CHAR_DIGIT16 & chartab[c]); }
static int isLetter(int c) { return 0 <= c && c <= 127 && (CHAR_LETTER & chartab[c]); }
static oop read(FILE *fp);
static oop readList(FILE *fp, int delim)
{
oop head= nil, tail= head, obj= nil;
GC_PROTECT(head);
GC_PROTECT(obj);
obj= read(fp);
if (obj == (oop)EOF) goto eof;
head= tail= newPair(obj, nil);
for (;;) {
obj= read(fp);
if (obj == (oop)EOF) goto eof;
if (obj == s_dot) {
obj= read(fp);
if (obj == (oop)EOF) fatal("missing item after .");
tail= set(tail, Pair,tail, obj);
obj= read(fp);
if (obj != (oop)EOF) fatal("extra item after .");
goto eof;
}
obj= newPair(obj, nil);