code.c 22.7 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
119
    switch(code->type)
    {
        case CT_APP_PRIM1:
        case CT_APP_PRIM2:
        case CT_APP_FUN:
120
        case CT_APP_FUN_TR:
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
121
122
        case CT_APP_FUN1:
        case CT_APP_FUN2:
123
124
125
126
127
128
129
        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:
130
        case CT_VAR_STRICT:            
131
132
            code->create_thunk = create_thunk_var;
            break;
133
134
        case CT_VAR_UNBOXED:
            code->create_thunk = create_thunk_var_unboxed;
135
136
137
138
            break;
        case CT_THUNK:
            code->create_thunk = create_thunk_thunk;
            break;
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
139
140
        case CT_SELECT_ADT:
        case CT_SELECT_LIT:    
141
        case CT_IF:
142
        case CT_LET:
143
144
145
            code->create_thunk = NULL;
            break;            
    }
146
147
}

148
149
150
151
152
153
154
// 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
155
void exec(Code* expr, int frame_ptr, int root_frame_ptr)
156
{
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
157
158
    if(heap_curr > gc_trigger) gc();
    
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
159
160
    int root_frame_ptr_b = stack_top_b;    
    
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
161
    while(1)
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
162
    {        
163
        assert(expr != NULL);
164
        assert(stack_top_a < STACK_SIZE_A);
165
        assert(stack_top_b < STACK_SIZE_B);
166
167
168

        // TODO: check over application
        // TODO: enforce strictness in ADT/Record
169
        
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
170
        switch (expr->type) {
171
172
        case CT_APP_PRIM1:
        {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
173
174
            switch(expr->arg_pattern)
            {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
175
176
177
178
179
180
181
182
183
184
            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
185
            }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
186
            
187
188
189
190
191
192
193
            ((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
194
        {           
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
195
196
197
            
            // careful, "exec" may trigger garbage collection
            // read local variables only after the last exec            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
198
199
            switch(expr->arg_pattern)
            {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
200
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
            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
237
            }
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
238
            
239
            ((PrimEntry*) ((AppEntry*) expr)->f)->exec(root_frame_ptr);
240

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
241
242
243
244
            destroy_stack_frame(root_frame_ptr);
            destroy_stack_frame_b(root_frame_ptr_b);
            return;            
        }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
245
246
247
248
249
250
251
252
253
254
255
256
257
258
        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;
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
259
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
260
261
262
263
264
265
266
267
268
            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
269
        case CT_APP_FUN:
270
        {            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
271
            Desc* slice = ((AppEntry*) expr)->f;
272

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
273
274
            int new_frame_ptr = stack_top_a;
            int argmask = 1;
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
275
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
276
277
            for (int i = 0; i < expr->nr_args; i++) {
                arg_from_code(slice, ((AppEntry*) expr)->args[i]);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
278
            }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
279

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
280
281
282
283
            expr = ((FunEntry*) slice)->body;
            frame_ptr = new_frame_ptr;
            continue;            
        }
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
        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
302
303
304
        case CT_APP_THUNK:
        {
            Desc* slice = ((AppEntry*) expr)->f;
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
305
306
307
            Thunk* thunk = get_dst(root_frame_ptr);
            int newsize = slice->thunk_size;
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
308
309
310
311
312
            if (thunk == NULL)
            {
                thunk = (Thunk*) alloc_heap(newsize);
                set_return(root_frame_ptr, thunk);
            }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
313
            else if (thunk->desc->thunk_size < newsize) {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
314
315
316
                Thunk* target = thunk;
                thunk = (Thunk*) alloc_heap(newsize);
                target->desc = (Desc*) __FORWARD_PTR__;
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
317
318
                target->_forward_ptr = thunk;
                set_return(root_frame_ptr, thunk);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
319
            }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
320

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
321
322
            thunk->desc = slice;
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
323
            assert(thunk->desc->arity == expr->nr_args);
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
324
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
325
326
            for (int i = 0; i < expr->nr_args; i++) {  
                ((AppEntry*) expr)->args[i]->create_thunk(((AppEntry*) expr)->args[i], &thunk->_args[i], frame_ptr);
327
            }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
328
329
330
331
332

            destroy_stack_frame(root_frame_ptr);
            destroy_stack_frame_b(root_frame_ptr_b);
            return;                                
        }
333
        case CT_APP_DYN:
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
334
        {
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
335
336
337
338
339
            push_a(local(frame_ptr, ((AppEntry*)expr)->var.index));

            Thunk** bt = &peek_a();
            (*bt)->desc->eval();
            
340
            Desc* slice =
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
341
342
                    get_slice((*bt)->desc->type == FT_SLICE ?
                              ((SliceEntry*) (*bt)->desc)->forward_ptr : (*bt)->desc, (*bt)->desc->arity + expr->nr_args);
343
344

            switch(slice->type) {
345
346
            case FT_PRIM1:
            case FT_PRIM2:
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
347
            {
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
348
349
350
351
                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();
                    
352
                }
353

354
                for (int i = 0; i < expr->nr_args; i++) {
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
355
                    placeholder();
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
356
                    exec(((AppEntry*) expr)->args[i], frame_ptr, stack_top_a);
357
358
359
                } 

                ((PrimEntry*) slice)->exec(root_frame_ptr);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
360
                destroy_stack_frame(root_frame_ptr);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
361
                destroy_stack_frame_b(root_frame_ptr_b);                
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
362
363
                return;                    
            }
364
365
366
367
368
            case FT_FUN:
            {
                int new_frame_ptr = stack_top_a;                    
                int argmask = 1;

Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
369
370
371
372
373
374
375
                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;
376
377
378
379
380
                }

                for (int i = 0; i < expr->nr_args; i++) {
                    arg_from_code(slice, ((AppEntry*) expr)->args[i]);    
                } 
381

382
383
384
385
386
387
388
389
                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
390
391
392
                Thunk* thunk = get_dst(root_frame_ptr);
                int newsize = slice->thunk_size;

Laszlo Domoszlai's avatar
fix bug    
Laszlo Domoszlai committed
393
394
395
396
397
398
                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
399
400
401
                    Thunk* target = thunk;
                    thunk = (Thunk*) alloc_heap(newsize);
                    target->desc = (Desc*) __FORWARD_PTR__;
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
402
403
                    target->_forward_ptr = thunk;
                    set_return(root_frame_ptr, thunk);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
404
                }
Laszlo Domoszlai's avatar
fix bug    
Laszlo Domoszlai committed
405
                
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
406
407
                thunk->desc = slice;
                
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
408
                assert(thunk->desc->arity == (*bt)->desc->arity + expr->nr_args);            
409

Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
410
                memcpy(&thunk->_args, &(*bt)->_args, sizeof(Thunk*) * (*bt)->desc->arity);
411
412

                for (int i = 0; i < expr->nr_args; i++) {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
413
                    ((AppEntry*) expr)->args[i]->create_thunk(((AppEntry*) expr)->args[i], &thunk->_args[(*bt)->desc->arity + i], frame_ptr);
414
415
416
                }

                destroy_stack_frame(root_frame_ptr);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
417
                destroy_stack_frame_b(root_frame_ptr_b);
418
                return;                    
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
419
            }
420
421
422
423
424
425
426
427
            case FT_BOXED_LIT:
                abort("Literal unexpected here");                
            case FT_CAF:
            case FT_CAF_REDUCED:
                not_implemented("CAF");
            }
        }
        case CT_VAR_STRICT:
428
        case CT_VAR_UNBOXED:            
429
        {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
430
            Thunk* arg = local(frame_ptr, ((VarEntry*) expr)->index);
431
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
432
            assert(is_hnf(arg));
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
433

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
434
            if(get_dst(root_frame_ptr) != NULL && arg->desc->thunk_size <= sizeof(Thunk))
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
435
            {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
436
                memcpy(get_dst(root_frame_ptr), arg, sizeof(Thunk));
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
437
438
439
440
            }
            else
            {
                forward_thunk(arg, root_frame_ptr);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
441
                set_return(root_frame_ptr, arg);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
442
443
            }
            
444
            destroy_stack_frame(root_frame_ptr);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
445
            destroy_stack_frame_b(root_frame_ptr_b);            
446
447
448
449
450
            return;                    
        }
        case CT_VAR:
        {
            Thunk* thunk = local(frame_ptr, ((VarEntry*) expr)->index);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
451

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
452
453
            assert(!instackb(thunk));
            
454
455
456
            follow_thunk(thunk);
            forward_thunk(thunk, root_frame_ptr);            
            set_return(root_frame_ptr, thunk);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
457

458
459
460
            switch(thunk->desc->type) {
            case FT_FUN:
            {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
461
462
                // Destroy stack frame before eval, it is not needed any more
                // Greatly reduces stack usage
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
463
464
                destroy_stack_frame(root_frame_ptr);
                destroy_stack_frame_b(root_frame_ptr_b);  
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
465
                                
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
466
467
468
469
                frame_ptr = stack_top_a;
                // Here frame_ptr == root_frame_ptr

                int argmask = 1;
470

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
471
                for (int i = 0; i < thunk->desc->arity; i++) {
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
472
473
474
475
476
477
478
                    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;
479
                }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
480
481
482

                expr = ((FunEntry*) thunk->desc)->body;
                continue;
483
            }
484
485
            case FT_PRIM1:
            case FT_PRIM2:
486
            {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
487
488

                for (int i = 0; i < thunk->desc->arity; i++) {
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
489
490
491
                    push_a(thunk->_args[i]);
                    thunk->_args[i]->desc->eval();
                    thunk = stack_a[root_frame_ptr-1];
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
492
493
494
                }

                ((PrimEntry*) thunk->desc)->exec(root_frame_ptr);
495
496
                
                destroy_stack_frame(root_frame_ptr);
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
497
                destroy_stack_frame_b(root_frame_ptr_b);                
498
499
500
501
502
503
504
505
506
507
                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
508
                destroy_stack_frame_b(root_frame_ptr_b);
509
510
                return;
            }            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
511
512
513
        }
        case CT_THUNK:
        {
514
            Thunk* thunk = &((ThunkEntry*) expr)->thunk;            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
            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);
            }

531
            destroy_stack_frame(root_frame_ptr);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
532
            destroy_stack_frame_b(root_frame_ptr_b);
533
            return;               
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
534
        }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
535
536
        case CT_SELECT_LIT:
        {
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
537
            placeholder();
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
538
            exec(((SelectEntry*) expr)->expr, frame_ptr, stack_top_a);
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
539
            Thunk* lit = pop_a();
540
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
541
542
543
544
            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
545

Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
546
547
                // NULL means "default", we accept it anyway
                if(caseEntry->lit != NULL)
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
548
                {
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
549
                    assert(caseEntry->lit->thunk.desc == (Desc*) __INT__);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
550
551
 
                    if(caseEntry->lit->thunk._int != lit->_int) continue;
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
552
                }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
553
554
555
556
557
558
559
560
561
                
                // must be SC_DEFAULT now
                handled = true;
                expr = caseEntry->body;
                break;
            }
            
            if(handled) continue;
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
562
563
564
565
566
567
568
569
570
            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
571
572
573
        }
        case CT_SELECT_ADT:
        {                        
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
574
575
            SelectEntry* select = (SelectEntry*) expr;
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
576
            push_a(NULL);
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
577
            exec(select->expr, frame_ptr, stack_top_a);
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
578
            Thunk* cons = pop_a();            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
579
580
            
            expr = select->bodies[((ADTEntry*)cons->desc)->idx];
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
581
582
583
584
585
586
587
588
589
            
            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
590
            
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
591
592
593
594
595
596
597
598
599
            if(select->fallback != NULL)
            {
                stack_top_a -= select->fallback_nrargs;
                expr = select->fallback;
                
                continue;
            }
            
            abort("no match");
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
600
601
602
        }
        case CT_IF:
        {        
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
603
            placeholder();
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
604
            exec(((IfEntry*) expr)->cond, frame_ptr, stack_top_a);
605
            Thunk* cond = pop_a();
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
606
               
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
607
608
609
610
611
612
613
614
            if (readB(cond)) {
                expr = ((IfEntry*) expr)->texpr;
                continue;                
            }
            else {
                expr = ((IfEntry*) expr)->fexpr;
                continue;     
            }
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
615
        }
616
617
618
619
620
621
622
623
624
        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
625
                    binding->body->create_thunk(binding->body, &stack_a[stack_top_a++], frame_ptr);
626
627
628
629
630
631
632
633
634
635
636
                }
                else // strict (including unboxed))
                {
                    push_a(NULL);
                    exec(binding->body, frame_ptr, stack_top_a);
                }
            }
            
            expr = ((LetEntry*) expr)->body;
            continue;
        }
637
638
639
640
        }
    }
}

Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
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 
659
660
        }
        
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
661
        argmask <<= 1;
662
663
    }

Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
664
    exec(((FunEntry*) thunk->desc)->body, frame_ptr, frame_ptr);
665
    //stack_a[frame_ptr] = stack_a[stack_top_a]; 
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
666
}
667

Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
668
669
670
671
672
673
674
675
676
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 
677
    }
Laszlo Domoszlai's avatar
GC    
Laszlo Domoszlai committed
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716

    ((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;
        case FT_PRIM1:
        case FT_PRIM2:
            desc->eval = eval_prim;
            break;
Laszlo Domoszlai's avatar
Laszlo Domoszlai committed
717
    }
718
}