code.c 24.2 KB
Newer Older
1
2
#include <stdio.h>
#include <stdlib.h>
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
3
#include <stdbool.h>
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
4
#include <strings.h>
5

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
6
#include "debug.h"
7
#include "code.h"
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
8
#include "mem.h"
9
#include "desc.h"
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
10
#include "gc.h"
11

12
13
// For compressing the source code a bit

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
14
15
#define instackb(addr) ((char*)addr >= (char*) &stack_b[0] && (char*)addr < (char*) &stack_b[STACK_SIZE_B])

16
17
18
19
#define follow_thunk(thunk) if (thunk->desc == (Desc*) __FORWARD_PTR__) thunk = thunk->_forward_ptr;

#define forward_thunk(thunk, frame_ptr) \
        Thunk* dst = get_dst(frame_ptr); \
20
        if(dst != NULL){ \
21
        dst->desc = (Desc*) __FORWARD_PTR__; \
22
23
        dst->_forward_ptr = thunk; \
        }
24

Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
25
#define placeholder() \
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
26
        push_a(alloc_b());
27

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
28
#define arg_from_code(descarg, arg) \
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
29
        if(((FunEntry*) (descarg))->boxing & argmask) \
30
        { \
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
31
            placeholder(); \
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
32
            exec(arg, frame_ptr, stack_top_a); \
33
        } \
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
34
35
36
37
38
        else if(((FunEntry*) (descarg))->strictness & argmask) \
        { \
            push_a(NULL); \
            exec(arg, frame_ptr, stack_top_a); \
        } \
39
40
        else \
        { \
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
41
            arg->create_thunk(arg, &stack_a[stack_top_a++], frame_ptr); \
42
43
44
        } \
        argmask <<= 1;

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
45
void create_thunk_app_static(Code* expr, Thunk** target, int frame_ptr)
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
46
{
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
47
    Thunk* thunk = (Thunk*) alloc_heap(((AppEntry*) expr)->f->thunk_size);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
48
    *target = thunk;
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
49
    thunk->desc = ((AppEntry*) expr)->f;
50

51
    assert(thunk->desc->arity == expr->nr_args);
52

53
    for (int i = 0; i < expr->nr_args; i++) {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
54
55
         ((AppEntry*) expr)->args[i]->create_thunk(((AppEntry*) expr)->args[i], &thunk->_args[i], frame_ptr);
    }                     
56
}
57

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
58
void create_thunk_app_dyn(Code* expr, Thunk** target, int frame_ptr)
59
{
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
60
    push_a(local(frame_ptr, ((AppEntry*)expr)->var.index));
61

Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
62
63
64
65
66
67
68
    int tmp = gc_enabled;
    gc_enabled = 0;
    peek_a()->desc->eval();
    gc_enabled = tmp;
    
    Thunk* basethunk = pop_a();
    
69
70
71
    Desc* slice =
            get_slice(basethunk->desc->type == FT_SLICE ?
                      ((SliceEntry*) basethunk->desc)->forward_ptr : basethunk->desc, basethunk->desc->arity + expr->nr_args);
72

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
73
74
    Thunk* thunk = (Thunk*) alloc_heap(slice->thunk_size);
    thunk->desc = slice;
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
75
76
    *target = thunk;
    
77
78
79
80
81
    assert(thunk->desc->arity == basethunk->desc->arity + expr->nr_args);            

    memcpy(&thunk->_args, &basethunk->_args, sizeof(Thunk*) * basethunk->desc->arity);

    for (int i = 0; i < expr->nr_args; i++) {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
82
83
        ((AppEntry*) expr)->args[i]->create_thunk(((AppEntry*) expr)->args[i], &thunk->_args[basethunk->desc->arity + i], frame_ptr);
    } 
84
85
}

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
86
void create_thunk_var(Code* expr, Thunk** target, int frame_ptr)
87
{
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
88
    *target = local(frame_ptr, ((VarEntry*) expr)->index);    
89
90
}

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
91
void create_thunk_var_unboxed(Code* expr, Thunk** target, int frame_ptr)
92
93
94
{
    Thunk* arg = local(frame_ptr, ((VarEntry*) expr)->index);

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
95
96
97
    if(instackb(arg))
    {
        // The likely case
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
98
99
100
        Thunk* newthunk = (Thunk*) alloc_heap(sizeof (Thunk));
        memcpy(newthunk, arg, sizeof(Thunk));
        *target = newthunk;        
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
101
102
103
    }
    else
    {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
104
        *target = arg;
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
105
    }
106
107
}

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
108
void create_thunk_thunk(Code* expr, Thunk** target, int frame_ptr)
109
{
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
110
    *target = &((ThunkEntry*) expr)->thunk;
111
112
}

113
void set_create_thunk_fun(Code* code)
114
{
115
116
117
118
    switch(code->type)
    {
        case CT_APP_PRIM1:
        case CT_APP_PRIM2:
119
        case CT_APP_PRIM:            
120
        case CT_APP_FUN:
121
        case CT_APP_FUN_TR:
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
122
123
        case CT_APP_FUN1:
        case CT_APP_FUN2:
124
125
126
127
128
129
130
        case CT_APP_THUNK:
            code->create_thunk = create_thunk_app_static;
            break;
        case CT_APP_DYN:
            code->create_thunk = create_thunk_app_dyn;
            break;
        case CT_VAR:
131
        case CT_VAR_STRICT:            
132
133
            code->create_thunk = create_thunk_var;
            break;
134
135
        case CT_VAR_UNBOXED:
            code->create_thunk = create_thunk_var_unboxed;
136
137
138
139
            break;
        case CT_THUNK:
            code->create_thunk = create_thunk_thunk;
            break;
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
140
141
        case CT_SELECT_ADT:
        case CT_SELECT_LIT:    
142
        case CT_IF:
143
        case CT_LET:
144
145
146
            code->create_thunk = NULL;
            break;            
    }
147
148
}

149
150
151
152
153
154
155
// eval: frame_ptr, frame_ptr
// start: stack_top_a, stack_top_a
// otherwise: frame_ptr, stack_top_a

// frame_ptr: first arguments
// root_frame_ptr: place of the result

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
156
void exec(Code* expr, int frame_ptr, int root_frame_ptr)
157
{
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
158
159
    if(heap_curr > gc_trigger) gc();
    
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
160
161
    int root_frame_ptr_b = stack_top_b;    
    
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
162
    while(1)
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
163
    {        
164
        assert(expr != NULL);
165
        assert(stack_top_a < STACK_SIZE_A);
166
        assert(stack_top_b < STACK_SIZE_B);
167
168
169

        // TODO: check over application
        // TODO: enforce strictness in ADT/Record
170
        
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
171
        switch (expr->type) {
172
173
        case CT_APP_PRIM1:
        {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
174
175
            switch(expr->arg_pattern)
            {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
176
177
178
179
180
181
182
183
184
185
            case 1:
                push_a(local(frame_ptr, ((VarEntry*) ((AppEntry*) expr)->args[0])->index));  
                break;
            case 2:
                push_a(&((ThunkEntry*) ((AppEntry*) expr)->args[0])->thunk);            
                break;
            default:
                placeholder();                        
                exec(((AppEntry*) expr)->args[0], frame_ptr, stack_top_a);
                break;
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
186
            }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
187
            
188
189
190
191
192
193
194
            ((PrimEntry*) ((AppEntry*) expr)->f)->exec(root_frame_ptr);

            destroy_stack_frame(root_frame_ptr);
            destroy_stack_frame_b(root_frame_ptr_b);
            return;                        
        }
        case CT_APP_PRIM2:
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
195
        {           
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
196
197
198
            
            // careful, "exec" may trigger garbage collection
            // read local variables only after the last exec            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
199
200
            switch(expr->arg_pattern)
            {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
            case 1:
                push_a(local(frame_ptr, ((VarEntry*) ((AppEntry*) expr)->args[0])->index));  
                push_a(&((ThunkEntry*) ((AppEntry*) expr)->args[1])->thunk);
                break;
            case 2:
                push_a(&((ThunkEntry*) ((AppEntry*) expr)->args[0])->thunk);            
                push_a(local(frame_ptr, ((VarEntry*) ((AppEntry*) expr)->args[1])->index));                        
                break;
            case 3:
                push_a(local(frame_ptr, ((VarEntry*) ((AppEntry*) expr)->args[0])->index));
                push_a(local(frame_ptr, ((VarEntry*) ((AppEntry*) expr)->args[1])->index));
                break;                    
            case 4:
                push_a(&((ThunkEntry*) ((AppEntry*) expr)->args[0])->thunk);            
                placeholder();                       
                exec(((AppEntry*) expr)->args[1], frame_ptr, stack_top_a);                    
                break;                    
            case 5:
                placeholder();                     
                exec(((AppEntry*) expr)->args[0], frame_ptr, stack_top_a);
                push_a(&((ThunkEntry*) ((AppEntry*) expr)->args[1])->thunk);                                
                break;                    
            case 6:
                push_a(local(frame_ptr, ((VarEntry*) ((AppEntry*) expr)->args[0])->index));
                placeholder();                       
                exec(((AppEntry*) expr)->args[1], frame_ptr, stack_top_a);
                break;                    
            case 7:
                placeholder();                        
                exec(((AppEntry*) expr)->args[0], frame_ptr, stack_top_a);
                push_a(local(frame_ptr, ((VarEntry*) ((AppEntry*) expr)->args[1])->index));
                break;                    
            default:
                placeholder();                       
                exec(((AppEntry*) expr)->args[0], frame_ptr, stack_top_a);
                placeholder();                        
                exec(((AppEntry*) expr)->args[1], frame_ptr, stack_top_a);                    
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
238
            }
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
239
            
240
            ((PrimEntry*) ((AppEntry*) expr)->f)->exec(root_frame_ptr);
241

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
242
243
244
245
            destroy_stack_frame(root_frame_ptr);
            destroy_stack_frame_b(root_frame_ptr_b);
            return;            
        }
246
247
        case CT_APP_PRIM:
        {           
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
            PrimEntry* desc = (PrimEntry*) ((AppEntry*) expr)->f;
            int argmask = 1;            
            
            for (int i = 0; i < desc->base.arity; i++) {

                if(desc->boxingMap & argmask)
                {
                    placeholder();
                    exec(((AppEntry*) expr)->args[i], frame_ptr, stack_top_a);
                }
                else
                {
                    push_a(NULL);
                    exec(((AppEntry*) expr)->args[i], frame_ptr, stack_top_a);
                }

                argmask <<= 1;            
            }

            desc->exec(root_frame_ptr);
            
            destroy_stack_frame(root_frame_ptr);
            destroy_stack_frame_b(root_frame_ptr_b);
            return;            
272
        }        
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
273
274
275
276
277
278
279
280
281
282
283
284
285
286
        case CT_APP_FUN1:
        {
            Desc* slice = ((AppEntry*) expr)->f;

            int argmask = 1;            
            arg_from_code(slice, ((AppEntry*) expr)->args[0]);
              
            expr = ((FunEntry*) slice)->body;
            frame_ptr = stack_top_a - 1;
            continue;                        
        }        
        case CT_APP_FUN2:
        {
            Desc* slice = ((AppEntry*) expr)->f;
287
                        
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
288
289
290
291
292
293
294
295
296
            int argmask = 1;
            
            arg_from_code(slice, ((AppEntry*) expr)->args[0]);
            arg_from_code(slice, ((AppEntry*) expr)->args[1]);
              
            expr = ((FunEntry*) slice)->body;
            frame_ptr = stack_top_a - 2;
            continue;                        
        }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
297
        case CT_APP_FUN:
298
        {            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
299
            Desc* slice = ((AppEntry*) expr)->f;
300

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
301
302
            int new_frame_ptr = stack_top_a;
            int argmask = 1;
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
303
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
304
305
            for (int i = 0; i < expr->nr_args; i++) {
                arg_from_code(slice, ((AppEntry*) expr)->args[i]);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
306
            }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
307

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
308
309
310
311
            expr = ((FunEntry*) slice)->body;
            frame_ptr = new_frame_ptr;
            continue;            
        }
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
        case CT_APP_FUN_TR:
        {            
            Desc* slice = ((AppEntry*) expr)->f;
            
            // TODO: B stack?
            int new_frame_ptr = stack_top_a;
            int argmask = 1;
                        
            for (int i = 0; i < expr->nr_args; i++) {
                arg_from_code(slice, ((AppEntry*) expr)->args[i]);
            }

            memcpy(&stack_a[frame_ptr], &stack_a[new_frame_ptr], sizeof(void*) * expr->nr_args);
            stack_top_a = frame_ptr + expr->nr_args;
            
            expr = ((FunEntry*) slice)->body;
            continue;            
        }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
330
331
332
        case CT_APP_THUNK:
        {
            Desc* slice = ((AppEntry*) expr)->f;
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
333
            Thunk* thunk = get_dst(root_frame_ptr);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
334
335
            
            // no need to check for array length, thunks in HNF are never overwritten
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
336
337
            int newsize = slice->thunk_size;
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
338
339
340
341
342
            if (thunk == NULL)
            {
                thunk = (Thunk*) alloc_heap(newsize);
                set_return(root_frame_ptr, thunk);
            }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
343
            else if (thunk->desc->thunk_size < newsize) {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
344
345
346
                Thunk* target = thunk;
                thunk = (Thunk*) alloc_heap(newsize);
                target->desc = (Desc*) __FORWARD_PTR__;
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
347
348
                target->_forward_ptr = thunk;
                set_return(root_frame_ptr, thunk);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
349
            }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
350

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
351
352
            thunk->desc = slice;
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
353
            assert(thunk->desc->arity == expr->nr_args);
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
354
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
355
356
            for (int i = 0; i < expr->nr_args; i++) {  
                ((AppEntry*) expr)->args[i]->create_thunk(((AppEntry*) expr)->args[i], &thunk->_args[i], frame_ptr);
357
            }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
358
359
360
361
362

            destroy_stack_frame(root_frame_ptr);
            destroy_stack_frame_b(root_frame_ptr_b);
            return;                                
        }
363
        case CT_APP_DYN:
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
364
        {
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
365
366
367
368
369
            push_a(local(frame_ptr, ((AppEntry*)expr)->var.index));

            Thunk** bt = &peek_a();
            (*bt)->desc->eval();
            
370
371
372
373
374
375
376
377
378
379
380
            
            Desc* baseDesc = (*bt)->desc->type == FT_SLICE ?
                              ((SliceEntry*) (*bt)->desc)->forward_ptr : (*bt)->desc;
            
            int newArity = (*bt)->desc->arity + expr->nr_args;
            
            if(newArity > baseDesc->arity)
            {
                
            }
            
381
            Desc* slice =
382
383
                    get_slice(baseDesc, newArity);
            
384
            switch(slice->type) {
385
            case FT_PRIM:
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
386
            {
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
387
388
389
390
                for (int i = 0; i < (*bt)->desc->arity; i++) {
                    push_a((*bt)->_args[i]);
                    /*if(!basethunk->_args[i]->desc->hnf)*/ (*bt)->_args[i]->desc->eval();
                    
391
                }
392

393
                for (int i = 0; i < expr->nr_args; i++) {
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
394
                    placeholder();
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
395
                    exec(((AppEntry*) expr)->args[i], frame_ptr, stack_top_a);
396
397
398
                } 

                ((PrimEntry*) slice)->exec(root_frame_ptr);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
399
                destroy_stack_frame(root_frame_ptr);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
400
                destroy_stack_frame_b(root_frame_ptr_b);                
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
401
402
                return;                    
            }
403
404
405
406
407
            case FT_FUN:
            {
                int new_frame_ptr = stack_top_a;                    
                int argmask = 1;

Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
408
409
410
411
412
413
414
                for (int i = 0; i < (*bt)->desc->arity; i++) {                    
                    push_a((*bt)->_args[i]);
                    if(((FunEntry*) (slice))->strictness & argmask /*&& !arg->desc->hnf*/) 
                    { 
                        (*bt)->_args[i]->desc->eval(); 
                    } 
                    argmask <<= 1;
415
416
417
418
419
                }

                for (int i = 0; i < expr->nr_args; i++) {
                    arg_from_code(slice, ((AppEntry*) expr)->args[i]);    
                } 
420

421
422
423
424
425
426
427
428
                expr = ((FunEntry*) slice)->body;
                frame_ptr = new_frame_ptr;
                continue;                    
            }
            case FT_SLICE:
            case FT_ADT:
            case FT_RECORD:
            {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
429
                Thunk* thunk = get_dst(root_frame_ptr);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
430
                // no need to check for array length, thunks in HNF are never overwritten
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
431
432
                int newsize = slice->thunk_size;

Laszlo Domoszlai's avatar
fix bug    
Laszlo Domoszlai committed
433
434
435
436
437
438
                if (thunk == NULL)
                {
                    thunk = (Thunk*) alloc_heap(newsize);
                    set_return(root_frame_ptr, thunk);
                }
                else if (thunk->desc->thunk_size < newsize) {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
439
440
441
                    Thunk* target = thunk;
                    thunk = (Thunk*) alloc_heap(newsize);
                    target->desc = (Desc*) __FORWARD_PTR__;
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
442
443
                    target->_forward_ptr = thunk;
                    set_return(root_frame_ptr, thunk);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
444
                }
Laszlo Domoszlai's avatar
fix bug    
Laszlo Domoszlai committed
445
                
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
446
447
                thunk->desc = slice;
                
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
448
                assert(thunk->desc->arity == (*bt)->desc->arity + expr->nr_args);            
449

Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
450
                memcpy(&thunk->_args, &(*bt)->_args, sizeof(Thunk*) * (*bt)->desc->arity);
451
452

                for (int i = 0; i < expr->nr_args; i++) {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
453
                    ((AppEntry*) expr)->args[i]->create_thunk(((AppEntry*) expr)->args[i], &thunk->_args[(*bt)->desc->arity + i], frame_ptr);
454
455
456
                }

                destroy_stack_frame(root_frame_ptr);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
457
                destroy_stack_frame_b(root_frame_ptr_b);
458
                return;                    
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
459
            }
460
461
462
463
464
465
466
467
            case FT_BOXED_LIT:
                abort("Literal unexpected here");                
            case FT_CAF:
            case FT_CAF_REDUCED:
                not_implemented("CAF");
            }
        }
        case CT_VAR_STRICT:
468
        case CT_VAR_UNBOXED:            
469
        {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
470
            Thunk* arg = local(frame_ptr, ((VarEntry*) expr)->index);
471
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
472
            assert(is_hnf(arg));
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
473

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
474
            // no need to check for array length, thunks in HNF are never overwritten
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
475
            if(get_dst(root_frame_ptr) != NULL && arg->desc->thunk_size <= sizeof(Thunk))
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
476
            {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
477
                memcpy(get_dst(root_frame_ptr), arg, sizeof(Thunk));
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
478
479
480
481
            }
            else
            {
                forward_thunk(arg, root_frame_ptr);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
482
                set_return(root_frame_ptr, arg);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
483
484
            }
            
485
            destroy_stack_frame(root_frame_ptr);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
486
            destroy_stack_frame_b(root_frame_ptr_b);            
487
488
489
490
491
            return;                    
        }
        case CT_VAR:
        {
            Thunk* thunk = local(frame_ptr, ((VarEntry*) expr)->index);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
492

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
493
494
            assert(!instackb(thunk));
            
495
496
497
            follow_thunk(thunk);
            forward_thunk(thunk, root_frame_ptr);            
            set_return(root_frame_ptr, thunk);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
498

499
500
501
            switch(thunk->desc->type) {
            case FT_FUN:
            {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
502
503
                // Destroy stack frame before eval, it is not needed any more
                // Greatly reduces stack usage
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
504
505
                destroy_stack_frame(root_frame_ptr);
                destroy_stack_frame_b(root_frame_ptr_b);  
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
506
                                
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
507
508
509
510
                frame_ptr = stack_top_a;
                // Here frame_ptr == root_frame_ptr

                int argmask = 1;
511

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
512
                for (int i = 0; i < thunk->desc->arity; i++) {
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
513
514
515
516
517
518
519
                    push_a(thunk->_args[i]);
                    if(((FunEntry*) (thunk->desc))->strictness & argmask /*&& !arg->desc->hnf*/) 
                    { 
                        thunk->_args[i]->desc->eval(); 
                        thunk = stack_a[root_frame_ptr-1];
                    }
                    argmask <<= 1;
520
                }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
521
522
523

                expr = ((FunEntry*) thunk->desc)->body;
                continue;
524
            }
525
            case FT_PRIM:
526
            {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
527
528

                for (int i = 0; i < thunk->desc->arity; i++) {
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
529
530
531
                    push_a(thunk->_args[i]);
                    thunk->_args[i]->desc->eval();
                    thunk = stack_a[root_frame_ptr-1];
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
532
533
534
                }

                ((PrimEntry*) thunk->desc)->exec(root_frame_ptr);
535
536
                
                destroy_stack_frame(root_frame_ptr);
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
537
                destroy_stack_frame_b(root_frame_ptr_b);                
538
539
540
541
542
543
544
545
546
547
                return;
            }
            case FT_CAF:
            case FT_CAF_REDUCED:
                not_implemented("CAF");            
            case FT_SLICE:
            case FT_ADT:
            case FT_RECORD:
            case FT_BOXED_LIT:
                destroy_stack_frame(root_frame_ptr);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
548
                destroy_stack_frame_b(root_frame_ptr_b);
549
550
                return;
            }            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
551
552
553
        }
        case CT_THUNK:
        {
554
            Thunk* thunk = &((ThunkEntry*) expr)->thunk;            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
            Thunk* dst = get_dst(root_frame_ptr);

            if(dst != NULL)
            {
                memcpy(dst, thunk, sizeof(Thunk));
                
                if(!instackb(dst))
                {
                    set_return(root_frame_ptr, thunk);
                }                
            }
            else
            {
                set_return(root_frame_ptr, thunk);
            }

571
            destroy_stack_frame(root_frame_ptr);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
572
            destroy_stack_frame_b(root_frame_ptr_b);
573
            return;               
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
574
        }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
575
576
        case CT_SELECT_LIT:
        {
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
577
            placeholder();
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
578
            exec(((SelectEntry*) expr)->expr, frame_ptr, stack_top_a);
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
579
            Thunk* lit = pop_a();
580
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
581
582
583
584
            bool handled = false;
            
            for (int i = 0; i < expr->nr_cases; i++) {
                SelectLitCaseEntry* caseEntry = &((SelectEntry*) expr)->cases[i];
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
585

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
586
587
                // NULL means "default", we accept it anyway
                if(caseEntry->lit != NULL)
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
588
                {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
589
590
                    assert(caseEntry->lit->thunk.desc == (Desc*) __INT__ ||
                           caseEntry->lit->thunk.desc == (Desc*) __BOOL__ );
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
591
592
 
                    if(caseEntry->lit->thunk._int != lit->_int) continue;
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
593
                }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
594
595
596
597
598
599
600
601
602
                
                // must be SC_DEFAULT now
                handled = true;
                expr = caseEntry->body;
                break;
            }
            
            if(handled) continue;
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
603
604
605
606
607
608
609
610
611
            if(((SelectEntry*) expr)->fallback != NULL)
            {
                stack_top_a -= ((SelectEntry*) expr)->fallback_nrargs;
                expr = ((SelectEntry*) expr)->fallback;
                
                continue;
            }
            
            abort("no match");
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
612
613
614
        }
        case CT_SELECT_ADT:
        {                        
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
615
616
            SelectEntry* select = (SelectEntry*) expr;
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
617
            push_a(NULL);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
618
            exec(select->expr, frame_ptr, stack_top_a);
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
619
            Thunk* cons = pop_a();            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
620
621
            
            expr = select->bodies[((ADTEntry*)cons->desc)->idx];
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
622
623
624
625
626
627
628
629
630
            
            if(expr != NULL)
            {
                for (int i = 0; i < cons->desc->arity; i++) {
                    push_a(cons->_args[i]);
                }                  
                
                continue;
            }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
631
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
632
633
634
635
636
637
638
639
640
            if(select->fallback != NULL)
            {
                stack_top_a -= select->fallback_nrargs;
                expr = select->fallback;
                
                continue;
            }
            
            abort("no match");
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
641
642
643
        }
        case CT_IF:
        {        
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
644
            placeholder();
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
645
            exec(((IfEntry*) expr)->cond, frame_ptr, stack_top_a);
646
            Thunk* cond = pop_a();
647
            
648
            // safe to do it before read as nothing can overwrite it in between
649
650
            stack_top_b--;
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
651
652
653
654
655
656
657
658
            if (readB(cond)) {
                expr = ((IfEntry*) expr)->texpr;
                continue;                
            }
            else {
                expr = ((IfEntry*) expr)->fexpr;
                continue;     
            }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
659
        }
660
661
662
663
664
665
666
667
668
        case CT_LET:
        {
            for(int i=0; i<expr->nr_bindings; i++)
            {
                LetBindingEntry* binding = ((LetEntry*) expr)->bindings[i];
                
                // Normal
                if(binding->type == 0)
                {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
669
                    binding->body->create_thunk(binding->body, &stack_a[stack_top_a++], frame_ptr);
670
671
672
673
674
675
676
677
678
679
680
                }
                else // strict (including unboxed))
                {
                    push_a(NULL);
                    exec(binding->body, frame_ptr, stack_top_a);
                }
            }
            
            expr = ((LetEntry*) expr)->body;
            continue;
        }
681
682
683
684
        }
    }
}

Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
void eval_hnf()
{
    return;
}

void eval_fun()
{
    Thunk* thunk = peek_a();    
    int frame_ptr = stack_top_a;
    int argmask = 1;

    for (int i = 0; i < thunk->desc->arity; i++) {
        push_a(thunk->_args[i]);

        if(((FunEntry*) (thunk->desc))->strictness & argmask)
        {
            thunk->_args[i]->desc->eval();
            thunk = stack_a[frame_ptr-1]; // refresh thunk ptr after eval 
703
704
        }
        
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
705
        argmask <<= 1;
706
707
    }

Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
708
709
    exec(((FunEntry*) thunk->desc)->body, frame_ptr, frame_ptr);
}
710

Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
711
712
713
714
715
716
717
718
719
void eval_prim()
{
    Thunk* thunk = peek_a();
    int frame_ptr = stack_top_a;

    for (int i = 0; i < thunk->desc->arity; i++) {
        push_a(thunk->_args[i]);        
        thunk->_args[i]->desc->eval();
        thunk = stack_a[frame_ptr-1]; // refresh thunk ptr after eval 
720
    }
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755

    ((PrimEntry*) thunk->desc)->exec(frame_ptr);        

    stack_top_a = frame_ptr;        
}

void eval_fwd_ptr()
{
    Thunk* thunk = pop_a();
    follow_thunk(thunk);
    push_a(thunk);
    thunk->desc->eval();
}   
   
void set_eval_fun(Desc* desc)
{
    if(desc == (Desc*) __FORWARD_PTR__)
    {
        desc->eval = eval_fwd_ptr;
        return;
    }
    
    switch(desc->type)
    {
        case FT_BOXED_LIT:
        case FT_RECORD:
        case FT_ADT:
        case FT_CAF:
        case FT_CAF_REDUCED:
        case FT_SLICE:
            desc->eval = eval_hnf;
            break;
        case FT_FUN:
            desc->eval = eval_fun;
            break;
756
        case FT_PRIM:
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
757
758
            desc->eval = eval_prim;
            break;
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
759
    }
760
}