4 typedef unsigned char u8;
5 typedef unsigned short u16;
6 typedef unsigned int u32;
7 typedef unsigned long long u64;
8 typedef signed char s8;
9 typedef signed short s16;
10 typedef signed int s32;
11 typedef signed long long s64;
14 typedef long long fixnum;
15 typedef unsigned long long cell;
18 typedef unsigned long cell;
21 inline static cell align(cell a, cell b)
23 return (a + (b-1)) & ~(b-1);
26 static const cell data_alignment = 16;
28 #define WORD_SIZE (signed)(sizeof(cell)*8)
32 #define TAG(x) ((cell)(x) & TAG_MASK)
33 #define UNTAG(x) ((cell)(x) & ~TAG_MASK)
34 #define RETAG(x,tag) (UNTAG(x) | (tag))
41 #define QUOTATION_TYPE 4
46 #define HEADER_TYPE 8 /* anything less than this is a tag */
48 #define GC_COLLECTED 5 /* can be anything other than FIXNUM_TYPE */
50 /*** Header types ***/
51 #define WRAPPER_TYPE 8
52 #define BYTE_ARRAY_TYPE 9
53 #define CALLSTACK_TYPE 10
54 #define STRING_TYPE 11
61 /* Not real types, but code_block's type can be set to this */
65 code_block_unoptimized,
71 /* Constants used when floating-point trap exceptions are thrown */
74 FP_TRAP_INVALID_OPERATION = 1 << 0,
75 FP_TRAP_OVERFLOW = 1 << 1,
76 FP_TRAP_UNDERFLOW = 1 << 2,
77 FP_TRAP_ZERO_DIVIDE = 1 << 3,
78 FP_TRAP_INEXACT = 1 << 4,
81 /* What Factor calls 'f' */
82 static const cell false_object = F_TYPE;
84 inline static bool immediate_p(cell obj)
86 return (obj == false_object || TAG(obj) == FIXNUM_TYPE);
89 inline static fixnum untag_fixnum(cell tagged)
92 assert(TAG(tagged) == FIXNUM_TYPE);
94 return ((fixnum)tagged) >> TAG_BITS;
97 inline static cell tag_fixnum(fixnum untagged)
99 return RETAG(untagged << TAG_BITS,FIXNUM_TYPE);
102 inline static cell tag_for(cell type)
104 return type < HEADER_TYPE ? type : OBJECT_TYPE;
112 /* Default ctor to make gcc 3.x happy */
113 explicit header() { abort(); }
115 explicit header(cell value_) : value(value_ << TAG_BITS) {}
120 assert(TAG(value) == FIXNUM_TYPE && untag_fixnum(value) < TYPE_COUNT);
127 return value >> TAG_BITS;
130 bool forwarding_pointer_p()
132 return TAG(value) == GC_COLLECTED;
135 object *forwarding_pointer()
137 return (object *)UNTAG(value);
140 void forward_to(object *pointer)
142 value = RETAG(pointer,GC_COLLECTED);
146 #define NO_TYPE_CHECK static const cell type_number = TYPE_COUNT
151 cell *slots() { return (cell *)this; }
155 /* Assembly code makes assumptions about the layout of this struct */
156 struct array : public object {
157 static const cell type_number = ARRAY_TYPE;
158 static const cell element_size = sizeof(cell);
162 cell *data() { return (cell *)(this + 1); }
165 /* These are really just arrays, but certain elements have special
167 struct tuple_layout : public array {
177 struct bignum : public object {
178 static const cell type_number = BIGNUM_TYPE;
179 static const cell element_size = sizeof(cell);
183 cell *data() { return (cell *)(this + 1); }
186 struct byte_array : public object {
187 static const cell type_number = BYTE_ARRAY_TYPE;
188 static const cell element_size = 1;
197 template<typename Scalar> Scalar *data() { return (Scalar *)(this + 1); }
200 /* Assembly code makes assumptions about the layout of this struct */
201 struct string : public object {
202 static const cell type_number = STRING_TYPE;
203 /* tagged num of chars */
210 u8 *data() { return (u8 *)(this + 1); }
213 /* The compiled code heap is structured into blocks. */
220 return header & 1 == 1;
238 void set_size(cell size)
240 header = (header & 0x7) | (size << 3);
244 struct free_heap_block : public heap_block
246 free_heap_block *next_free;
249 struct code_block : public heap_block
251 cell owner; /* tagged pointer to word, quotation or f */
252 cell literals; /* tagged pointer to array or f */
253 cell relocation; /* tagged pointer to byte-array or f */
257 return (void *)(this + 1);
260 code_block_type type()
262 return (code_block_type)((header >> 1) & 0x3);
265 void set_type(code_block_type type)
267 header = ((header & ~0x7) | (type << 1));
272 return type() == code_block_pic;
277 return type() == code_block_optimized;
281 /* Assembly code makes assumptions about the layout of this struct */
282 struct word : public object {
283 static const cell type_number = WORD_TYPE;
284 /* TAGGED hashcode */
286 /* TAGGED word name */
288 /* TAGGED word vocabulary */
290 /* TAGGED definition */
292 /* TAGGED property assoc for library code */
294 /* TAGGED alternative entry point for direct non-tail calls. Used for inline caching */
296 /* TAGGED alternative entry point for direct tail calls. Used for inline caching */
298 /* TAGGED call count for profiling */
300 /* TAGGED machine code for sub-primitive */
302 /* UNTAGGED execution token: jump here to execute word */
304 /* UNTAGGED compiled code block */
306 /* UNTAGGED profiler stub */
307 code_block *profiling;
310 /* Assembly code makes assumptions about the layout of this struct */
311 struct wrapper : public object {
312 static const cell type_number = WRAPPER_TYPE;
316 /* Assembly code makes assumptions about the layout of this struct */
317 struct boxed_float : object {
318 static const cell type_number = FLOAT_TYPE;
327 /* Assembly code makes assumptions about the layout of this struct */
328 struct quotation : public object {
329 static const cell type_number = QUOTATION_TYPE;
338 /* UNTAGGED compiled code block */
342 /* Assembly code makes assumptions about the layout of this struct */
343 struct alien : public object {
344 static const cell type_number = ALIEN_TYPE;
353 struct dll : public object {
354 static const cell type_number = DLL_TYPE;
355 /* tagged byte array holding a C string */
357 /* OS-specific handle */
364 /* Frame size in bytes */
368 struct callstack : public object {
369 static const cell type_number = CALLSTACK_TYPE;
373 stack_frame *frame_at(cell offset)
375 return (stack_frame *)((char *)(this + 1) + offset);
378 stack_frame *top() { return (stack_frame *)(this + 1); }
379 stack_frame *bottom() { return (stack_frame *)((cell)(this + 1) + untag_fixnum(length)); }
382 struct tuple : public object {
383 static const cell type_number = TUPLE_TYPE;
387 cell *data() { return (cell *)(this + 1); }