forked from perlin-network/life
/
vm.go
2099 lines (1820 loc) · 66.1 KB
/
vm.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
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
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
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
717
718
719
720
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
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
package exec
import (
"encoding/binary"
"fmt"
"math"
"math/bits"
"runtime/debug"
"strings"
"time"
"github.com/go-interpreter/wagon/wasm"
"github.com/bradyjoestar/life/compiler"
"github.com/bradyjoestar/life/compiler/opcodes"
"github.com/bradyjoestar/life/utils"
)
type FunctionImport func(vm *VirtualMachine) int64
const (
// DefaultCallStackSize is the default call stack size.
DefaultCallStackSize = 512
// DefaultPageSize is the linear memory page size.
DefaultPageSize = 65536
// JITCodeSizeThreshold is the lower-bound code size threshold for the JIT compiler.
JITCodeSizeThreshold = 30
)
// LE is a simple alias to `binary.LittleEndian`.
var LE = binary.LittleEndian
type FunctionImportInfo struct {
ModuleName string
FieldName string
F FunctionImport
}
type NCompileConfig struct {
AliasDef bool
DisableMemBoundCheck bool
}
type AOTService interface {
Initialize(vm *VirtualMachine)
UnsafeInvokeFunction_0(vm *VirtualMachine, name string) uint64
UnsafeInvokeFunction_1(vm *VirtualMachine, name string, p0 uint64) uint64
UnsafeInvokeFunction_2(vm *VirtualMachine, name string, p0, p1 uint64) uint64
}
// VirtualMachine is a WebAssembly execution environment.
type VirtualMachine struct {
Config VMConfig
Module *compiler.Module
FunctionCode []compiler.InterpreterCode
FunctionImports []FunctionImportInfo
CallStack []Frame
CurrentFrame int
Table []uint32
Globals []int64
Memory []byte
NumValueSlots int
Yielded int64
InsideExecute bool
Delegate func()
Exited bool
ExitError interface{}
ReturnValue int64
Gas uint64
GasLimitExceeded bool
GasPolicy compiler.GasPolicy
ImportResolver ImportResolver
AOTService AOTService
StackTrace string
}
// VMConfig denotes a set of options passed to a single VirtualMachine insta.ce
type VMConfig struct {
EnableJIT bool
MaxMemoryPages int
MaxTableSize int
MaxValueSlots int
MaxCallStackDepth int
DefaultMemoryPages int
DefaultTableSize int
GasLimit uint64
DisableFloatingPoint bool
ReturnOnGasLimitExceeded bool
}
// Frame represents a call frame.
type Frame struct {
FunctionID int
Code []byte
Regs []int64
Locals []int64
IP int
ReturnReg int
Continuation int32
}
// ImportResolver is an interface for allowing one to define imports to WebAssembly modules
// ran under a single VirtualMachine instance.
type ImportResolver interface {
ResolveFunc(module, field string) FunctionImport
ResolveGlobal(module, field string) int64
}
type Module struct {
Config VMConfig
Module *compiler.Module
FunctionCode []compiler.InterpreterCode
FunctionImports []FunctionImportInfo
Table []uint32
Globals []int64
GasPolicy compiler.GasPolicy
ImportResolver ImportResolver
}
var (
emptyGlobals = []int64{}
emptyFuncImports = []FunctionImportInfo{}
emptyMemory = []byte{}
emptyTable = []uint32{}
)
// NewModule instantiates a module for a given WebAssembly module, with
// specific execution options specified under a VMConfig, and a WebAssembly module import
// resolver.
func NewModule(
code []byte,
config VMConfig,
impResolver ImportResolver,
gasPolicy compiler.GasPolicy,
) (_retVM *Module, retErr error) {
if config.EnableJIT {
fmt.Println("Warning: JIT support is removed.")
}
fmt.Println("load module begin:"+time.Now().UTC().String())
m, err := compiler.LoadModule(code)
if err != nil {
return nil, err
}
fmt.Println("load module end :"+time.Now().UTC().String())
m.DisableFloatingPoint = config.DisableFloatingPoint
fmt.Println("CompileForInterpreter begin:"+time.Now().UTC().String())
functionCode, err := m.CompileForInterpreter(gasPolicy)
if err != nil {
return nil, err
}
fmt.Println("CompileForInterpreter end :"+time.Now().UTC().String())
defer utils.CatchPanic(&retErr)
table := emptyTable
globals := emptyGlobals
funcImports := emptyFuncImports
if m.Base.Import != nil && impResolver != nil {
for _, imp := range m.Base.Import.Entries {
switch imp.Type.Kind() {
case wasm.ExternalFunction:
funcImports = append(funcImports, FunctionImportInfo{
ModuleName: imp.ModuleName,
FieldName: imp.FieldName,
F: nil, // deferred
})
case wasm.ExternalGlobal:
globals = append(globals, impResolver.ResolveGlobal(imp.ModuleName, imp.FieldName))
case wasm.ExternalMemory:
// TODO: Do we want a real import?
if m.Base.Memory != nil && len(m.Base.Memory.Entries) > 0 {
panic("cannot import another memory while we already have one")
}
m.Base.Memory = &wasm.SectionMemories{
Entries: []wasm.Memory{
{
Limits: wasm.ResizableLimits{
Initial: uint32(config.DefaultMemoryPages),
},
},
},
}
case wasm.ExternalTable:
// TODO: Do we want a real import?
if m.Base.Table != nil && len(m.Base.Table.Entries) > 0 {
panic("cannot import another table while we already have one")
}
m.Base.Table = &wasm.SectionTables{
Entries: []wasm.Table{
{
Limits: wasm.ResizableLimits{
Initial: uint32(config.DefaultTableSize),
},
},
},
}
default:
panic(fmt.Errorf("import kind not supported: %d", imp.Type.Kind()))
}
}
}
// Load global entries.
for _, entry := range m.Base.GlobalIndexSpace {
globals = append(globals, execInitExpr(entry.Init, globals))
}
// Populate table elements.
if m.Base.Table != nil && len(m.Base.Table.Entries) > 0 {
t := &m.Base.Table.Entries[0]
if config.MaxTableSize != 0 && int(t.Limits.Initial) > config.MaxTableSize {
panic("max table size exceeded")
}
table = make([]uint32, int(t.Limits.Initial))
for i := 0; i < int(t.Limits.Initial); i++ {
table[i] = 0xffffffff
}
if m.Base.Elements != nil && len(m.Base.Elements.Entries) > 0 {
for _, e := range m.Base.Elements.Entries {
offset := int(execInitExpr(e.Offset, globals))
copy(table[offset:], e.Elems)
}
}
}
return &Module{
Module: m,
Config: config,
FunctionCode: functionCode,
FunctionImports: funcImports,
Table: table,
Globals: globals,
GasPolicy: gasPolicy,
ImportResolver: impResolver,
}, nil
}
func (m *Module) getExport(key string, kind wasm.External) (int, bool) {
if m.Module.Base.Export == nil {
return -1, false
}
entry, ok := m.Module.Base.Export.Entries[key]
if !ok {
return -1, false
}
if entry.Kind != kind {
return -1, false
}
return int(entry.Index), true
}
// GetGlobalExport returns the global export with the given name.
func (m *Module) GetGlobalExport(key string) (int, bool) {
return m.getExport(key, wasm.ExternalGlobal)
}
// GetFunctionExport returns the function export with the given name.
func (m *Module) GetFunctionExport(key string) (int, bool) {
return m.getExport(key, wasm.ExternalFunction)
}
func (m *Module) GenerateNEnv(config NCompileConfig) string {
builder := &strings.Builder{}
bSprintf(builder, "#include <stdint.h>\n\n")
if config.DisableMemBoundCheck {
builder.WriteString("#define POLYMERASE_NO_MEM_BOUND_CHECK\n")
}
builder.WriteString(compiler.NGEN_HEADER)
if !m.Config.DisableFloatingPoint {
builder.WriteString(compiler.NGEN_FP_HEADER)
}
bSprintf(builder, "static uint64_t globals[] = {")
for _, v := range m.Globals {
bSprintf(builder, "%dull,", uint64(v))
}
bSprintf(builder, "};\n")
for i, code := range m.FunctionCode {
bSprintf(builder, "uint64_t %s%d(struct VirtualMachine *", compiler.NGEN_FUNCTION_PREFIX, i)
for j := 0; j < code.NumParams; j++ {
bSprintf(builder, ",uint64_t")
}
bSprintf(builder, ");\n")
}
// call_indirect dispatcher.
bSprintf(builder, "struct TableEntry { uint64_t num_params; void *func; };\n")
bSprintf(builder, "static const uint64_t num_table_entries = %d;\n", len(m.Table))
bSprintf(builder, "static struct TableEntry table[] = {\n")
for _, entry := range m.Table {
if entry == math.MaxUint32 {
bSprintf(builder, "{ .num_params = 0, .func = 0 },\n")
} else {
functionID := int(entry)
code := m.FunctionCode[functionID]
bSprintf(builder, "{ .num_params = %d, .func = %s%d },\n", code.NumParams, compiler.NGEN_FUNCTION_PREFIX, functionID)
}
}
bSprintf(builder, "};\n")
bSprintf(builder, "static void * __attribute__((always_inline)) %sresolve_indirect(struct VirtualMachine *vm, uint64_t entry_id, uint64_t num_params) {\n", compiler.NGEN_ENV_API_PREFIX)
bSprintf(builder, "if(entry_id >= num_table_entries) { vm->throw_s(vm, \"%s\"); }\n", "table entry out of bounds")
bSprintf(builder, "if(table[entry_id].func == 0) { vm->throw_s(vm, \"%s\"); }\n", "table entry is null")
bSprintf(builder, "if(table[entry_id].num_params != num_params) { vm->throw_s(vm, \"%s\"); }\n", "argument count mismatch")
bSprintf(builder, "return table[entry_id].func;\n")
bSprintf(builder, "}\n")
bSprintf(builder, "struct ImportEntry { const char *module_name; const char *field_name; ExternalFunction f; };\n")
bSprintf(builder, "static const uint64_t num_import_entries = %d;\n", len(m.FunctionImports))
bSprintf(builder, "static struct ImportEntry imports[] = {\n")
for _, imp := range m.FunctionImports {
bSprintf(builder, "{ .module_name = \"%s\", .field_name = \"%s\", .f = 0 },\n", escapeName(imp.ModuleName), escapeName(imp.FieldName))
}
bSprintf(builder, "};\n")
bSprintf(builder,
"static uint64_t __attribute__((always_inline)) %sinvoke_import(struct VirtualMachine *vm, uint64_t import_id, uint64_t num_params, uint64_t *params) {\n",
compiler.NGEN_ENV_API_PREFIX,
)
bSprintf(builder, "if(import_id >= num_import_entries) { vm->throw_s(vm, \"%s\"); }\n", "import entry out of bounds")
bSprintf(builder, "if(imports[import_id].f == 0) { imports[import_id].f = vm->resolve_import(vm, imports[import_id].module_name, imports[import_id].field_name); }\n")
bSprintf(builder, "if(imports[import_id].f == 0) { vm->throw_s(vm, \"%s\"); }\n", "cannot resolve import")
bSprintf(builder, "return imports[import_id].f(vm, import_id, num_params, params);\n")
bSprintf(builder, "}\n")
return builder.String()
}
func (m *Module) NBuildAliasDef() string {
builder := &strings.Builder{}
builder.WriteString("// Aliases for exported functions\n")
if m.Module.Base.Export != nil {
for name, exp := range m.Module.Base.Export.Entries {
if exp.Kind == wasm.ExternalFunction {
bSprintf(builder, "#define %sexport_%s %s%d\n", compiler.NGEN_FUNCTION_PREFIX, filterName(name), compiler.NGEN_FUNCTION_PREFIX, exp.Index)
}
}
}
return builder.String()
}
func (m *Module) NCompile(config NCompileConfig) string {
body, err := m.Module.CompileWithNGen(m.GasPolicy, uint64(len(m.Globals)))
if err != nil {
panic(err)
}
out := m.GenerateNEnv(config) + "\n" + body
if config.AliasDef {
out += "\n"
out += m.NBuildAliasDef()
}
return out
}
// NewVirtualMachine instantiates a virtual machine for the module.
func (m *Module) NewVirtualMachine() *VirtualMachine {
globals := make([]int64, len(m.Globals))
copy(globals, m.Globals)
table := make([]uint32, len(m.Table))
copy(table, m.Table)
// Load linear memory.
memory := emptyMemory
if m.Module.Base.Memory != nil && len(m.Module.Base.Memory.Entries) > 0 {
initialLimit := int(m.Module.Base.Memory.Entries[0].Limits.Initial)
if m.Config.MaxMemoryPages != 0 && initialLimit > m.Config.MaxMemoryPages {
panic("max memory exceeded")
}
capacity := initialLimit * DefaultPageSize
// Initialize empty memory.
memory = make([]byte, capacity)
for i := 0; i < capacity; i++ {
memory[i] = 0
}
if m.Module.Base.Data != nil && len(m.Module.Base.Data.Entries) > 0 {
for _, e := range m.Module.Base.Data.Entries {
offset := int(execInitExpr(e.Offset, globals))
copy(memory[offset:], e.Data)
}
}
}
return &VirtualMachine{
Module: m.Module,
Config: m.Config,
FunctionCode: m.FunctionCode,
FunctionImports: m.FunctionImports,
CallStack: make([]Frame, DefaultCallStackSize),
CurrentFrame: -1,
Table: table,
Globals: globals,
Memory: memory,
Exited: true,
GasPolicy: m.GasPolicy,
ImportResolver: m.ImportResolver,
}
}
// NewVirtualMachine instantiates a virtual machine for a given WebAssembly module, with
// specific execution options specified under a VMConfig, and a WebAssembly module import
// resolver.
func NewVirtualMachine(
code []byte,
config VMConfig,
impResolver ImportResolver,
gasPolicy compiler.GasPolicy,
) (_retVM *VirtualMachine, retErr error) {
if config.EnableJIT {
fmt.Println("Warning: JIT support is removed.")
}
m, err := compiler.LoadModule(code)
if err != nil {
return nil, err
}
m.DisableFloatingPoint = config.DisableFloatingPoint
functionCode, err := m.CompileForInterpreter(gasPolicy)
if err != nil {
return nil, err
}
defer utils.CatchPanic(&retErr)
table := emptyTable
globals := emptyGlobals
funcImports := emptyFuncImports
if m.Base.Import != nil && impResolver != nil {
for _, imp := range m.Base.Import.Entries {
switch imp.Type.Kind() {
case wasm.ExternalFunction:
funcImports = append(funcImports, FunctionImportInfo{
ModuleName: imp.ModuleName,
FieldName: imp.FieldName,
F: nil, // deferred
})
case wasm.ExternalGlobal:
globals = append(globals, impResolver.ResolveGlobal(imp.ModuleName, imp.FieldName))
case wasm.ExternalMemory:
// TODO: Do we want a real import?
if m.Base.Memory != nil && len(m.Base.Memory.Entries) > 0 {
panic("cannot import another memory while we already have one")
}
m.Base.Memory = &wasm.SectionMemories{
Entries: []wasm.Memory{
{
Limits: wasm.ResizableLimits{
Initial: uint32(config.DefaultMemoryPages),
},
},
},
}
case wasm.ExternalTable:
// TODO: Do we want a real import?
if m.Base.Table != nil && len(m.Base.Table.Entries) > 0 {
panic("cannot import another table while we already have one")
}
m.Base.Table = &wasm.SectionTables{
Entries: []wasm.Table{
{
Limits: wasm.ResizableLimits{
Initial: uint32(config.DefaultTableSize),
},
},
},
}
default:
panic(fmt.Errorf("import kind not supported: %d", imp.Type.Kind()))
}
}
}
// Load global entries.
for _, entry := range m.Base.GlobalIndexSpace {
globals = append(globals, execInitExpr(entry.Init, globals))
}
// Populate table elements.
if m.Base.Table != nil && len(m.Base.Table.Entries) > 0 {
t := &m.Base.Table.Entries[0]
if config.MaxTableSize != 0 && int(t.Limits.Initial) > config.MaxTableSize {
panic("max table size exceeded")
}
table = make([]uint32, int(t.Limits.Initial))
for i := 0; i < int(t.Limits.Initial); i++ {
table[i] = 0xffffffff
}
if m.Base.Elements != nil && len(m.Base.Elements.Entries) > 0 {
for _, e := range m.Base.Elements.Entries {
offset := int(execInitExpr(e.Offset, globals))
copy(table[offset:], e.Elems)
}
}
}
// Load linear memory.
memory := emptyMemory
if m.Base.Memory != nil && len(m.Base.Memory.Entries) > 0 {
initialLimit := int(m.Base.Memory.Entries[0].Limits.Initial)
if config.MaxMemoryPages != 0 && initialLimit > config.MaxMemoryPages {
panic("max memory exceeded")
}
capacity := initialLimit * DefaultPageSize
// Initialize empty memory.
memory = make([]byte, capacity)
for i := 0; i < capacity; i++ {
memory[i] = 0
}
if m.Base.Data != nil && len(m.Base.Data.Entries) > 0 {
for _, e := range m.Base.Data.Entries {
offset := int(execInitExpr(e.Offset, globals))
copy(memory[offset:], e.Data)
}
}
}
return &VirtualMachine{
Module: m,
Config: config,
FunctionCode: functionCode,
FunctionImports: funcImports,
CallStack: make([]Frame, DefaultCallStackSize),
CurrentFrame: -1,
Table: table,
Globals: globals,
Memory: memory,
Exited: true,
GasPolicy: gasPolicy,
ImportResolver: impResolver,
}, nil
}
func (vm *VirtualMachine) SetAOTService(s AOTService) {
s.Initialize(vm)
vm.AOTService = s
}
func bSprintf(builder *strings.Builder, format string, args ...interface{}) { // nolint:interfacer
builder.WriteString(fmt.Sprintf(format, args...))
}
func escapeName(name string) string {
ret := ""
for _, ch := range []byte(name) {
if (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') || (ch >= '0' && ch <= '9') || ch == '_' {
ret += string(ch)
} else {
ret += fmt.Sprintf("\\x%02x", ch)
}
}
return ret
}
func filterName(name string) string {
ret := ""
for _, ch := range []byte(name) {
if (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') || (ch >= '0' && ch <= '9') || ch == '_' {
ret += string(ch)
}
}
return ret
}
func (vm *VirtualMachine) GenerateNEnv(config NCompileConfig) string {
builder := &strings.Builder{}
bSprintf(builder, "#include <stdint.h>\n\n")
if config.DisableMemBoundCheck {
builder.WriteString("#define POLYMERASE_NO_MEM_BOUND_CHECK\n")
}
builder.WriteString(compiler.NGEN_HEADER)
if !vm.Config.DisableFloatingPoint {
builder.WriteString(compiler.NGEN_FP_HEADER)
}
bSprintf(builder, "static uint64_t globals[] = {")
for _, v := range vm.Globals {
bSprintf(builder, "%dull,", uint64(v))
}
bSprintf(builder, "};\n")
for i, code := range vm.FunctionCode {
bSprintf(builder, "uint64_t %s%d(struct VirtualMachine *", compiler.NGEN_FUNCTION_PREFIX, i)
for j := 0; j < code.NumParams; j++ {
bSprintf(builder, ",uint64_t")
}
bSprintf(builder, ");\n")
}
// call_indirect dispatcher.
bSprintf(builder, "struct TableEntry { uint64_t num_params; void *func; };\n")
bSprintf(builder, "static const uint64_t num_table_entries = %d;\n", len(vm.Table))
bSprintf(builder, "static struct TableEntry table[] = {\n")
for _, entry := range vm.Table {
if entry == math.MaxUint32 {
bSprintf(builder, "{ .num_params = 0, .func = 0 },\n")
} else {
functionID := int(entry)
code := vm.FunctionCode[functionID]
bSprintf(builder, "{ .num_params = %d, .func = %s%d },\n", code.NumParams, compiler.NGEN_FUNCTION_PREFIX, functionID)
}
}
bSprintf(builder, "};\n")
bSprintf(builder, "static void * __attribute__((always_inline)) %sresolve_indirect(struct VirtualMachine *vm, uint64_t entry_id, uint64_t num_params) {\n", compiler.NGEN_ENV_API_PREFIX)
bSprintf(builder, "if(entry_id >= num_table_entries) { vm->throw_s(vm, \"%s\"); }\n", "table entry out of bounds")
bSprintf(builder, "if(table[entry_id].func == 0) { vm->throw_s(vm, \"%s\"); }\n", "table entry is null")
bSprintf(builder, "if(table[entry_id].num_params != num_params) { vm->throw_s(vm, \"%s\"); }\n", "argument count mismatch")
bSprintf(builder, "return table[entry_id].func;\n")
bSprintf(builder, "}\n")
bSprintf(builder, "struct ImportEntry { const char *module_name; const char *field_name; ExternalFunction f; };\n")
bSprintf(builder, "static const uint64_t num_import_entries = %d;\n", len(vm.FunctionImports))
bSprintf(builder, "static struct ImportEntry imports[] = {\n")
for _, imp := range vm.FunctionImports {
bSprintf(builder, "{ .module_name = \"%s\", .field_name = \"%s\", .f = 0 },\n", escapeName(imp.ModuleName), escapeName(imp.FieldName))
}
bSprintf(builder, "};\n")
bSprintf(builder,
"static uint64_t __attribute__((always_inline)) %sinvoke_import(struct VirtualMachine *vm, uint64_t import_id, uint64_t num_params, uint64_t *params) {\n",
compiler.NGEN_ENV_API_PREFIX,
)
bSprintf(builder, "if(import_id >= num_import_entries) { vm->throw_s(vm, \"%s\"); }\n", "import entry out of bounds")
bSprintf(builder, "if(imports[import_id].f == 0) { imports[import_id].f = vm->resolve_import(vm, imports[import_id].module_name, imports[import_id].field_name); }\n")
bSprintf(builder, "if(imports[import_id].f == 0) { vm->throw_s(vm, \"%s\"); }\n", "cannot resolve import")
bSprintf(builder, "return imports[import_id].f(vm, import_id, num_params, params);\n")
bSprintf(builder, "}\n")
return builder.String()
}
func (vm *VirtualMachine) NBuildAliasDef() string {
builder := &strings.Builder{}
builder.WriteString("// Aliases for exported functions\n")
if vm.Module.Base.Export != nil {
for name, exp := range vm.Module.Base.Export.Entries {
if exp.Kind == wasm.ExternalFunction {
bSprintf(builder, "#define %sexport_%s %s%d\n", compiler.NGEN_FUNCTION_PREFIX, filterName(name), compiler.NGEN_FUNCTION_PREFIX, exp.Index)
}
}
}
return builder.String()
}
func (vm *VirtualMachine) NCompile(config NCompileConfig) string {
body, err := vm.Module.CompileWithNGen(vm.GasPolicy, uint64(len(vm.Globals)))
if err != nil {
panic(err)
}
out := vm.GenerateNEnv(config) + "\n" + body
if config.AliasDef {
out += "\n"
out += vm.NBuildAliasDef()
}
return out
}
// Init initializes a frame. Must be called on `call` and `call_indirect`.
func (f *Frame) Init(vm *VirtualMachine, functionID int, code compiler.InterpreterCode) {
numValueSlots := code.NumRegs + code.NumParams + code.NumLocals
if vm.Config.MaxValueSlots != 0 && vm.NumValueSlots+numValueSlots > vm.Config.MaxValueSlots {
panic("max value slot count exceeded")
}
vm.NumValueSlots += numValueSlots
values := make([]int64, numValueSlots)
f.FunctionID = functionID
f.Regs = values[:code.NumRegs]
f.Locals = values[code.NumRegs:]
f.Code = code.Bytes
f.IP = 0
f.Continuation = 0
//fmt.Printf("Enter function %d (%s)\n", functionID, vm.Module.FunctionNames[functionID])
}
// Destroy destroys a frame. Must be called on return.
func (f *Frame) Destroy(vm *VirtualMachine) {
numValueSlots := len(f.Regs) + len(f.Locals)
vm.NumValueSlots -= numValueSlots
//fmt.Printf("Leave function %d (%s)\n", f.FunctionID, vm.Module.FunctionNames[f.FunctionID])
}
// GetCurrentFrame returns the current frame.
func (vm *VirtualMachine) GetCurrentFrame() *Frame {
if vm.Config.MaxCallStackDepth != 0 && vm.CurrentFrame >= vm.Config.MaxCallStackDepth {
panic("max call stack depth exceeded")
}
if vm.CurrentFrame >= len(vm.CallStack) {
panic("call stack overflow")
//vm.CallStack = append(vm.CallStack, make([]Frame, DefaultCallStackSize / 2)...)
}
return &vm.CallStack[vm.CurrentFrame]
}
func (vm *VirtualMachine) getExport(key string, kind wasm.External) (int, bool) {
if vm.Module.Base.Export == nil {
return -1, false
}
entry, ok := vm.Module.Base.Export.Entries[key]
if !ok {
return -1, false
}
if entry.Kind != kind {
return -1, false
}
return int(entry.Index), true
}
// GetGlobalExport returns the global export with the given name.
func (vm *VirtualMachine) GetGlobalExport(key string) (int, bool) {
return vm.getExport(key, wasm.ExternalGlobal)
}
// GetFunctionExport returns the function export with the given name.
func (vm *VirtualMachine) GetFunctionExport(key string) (int, bool) {
return vm.getExport(key, wasm.ExternalFunction)
}
// PrintStackTrace prints the entire VM stack trace for debugging.
func (vm *VirtualMachine) PrintStackTrace() {
fmt.Println("--- Begin stack trace ---")
for i := vm.CurrentFrame; i >= 0; i-- {
functionID := vm.CallStack[i].FunctionID
fmt.Printf("<%d> [%d] %s\n", i, functionID, vm.Module.FunctionNames[functionID])
}
fmt.Println("--- End stack trace ---")
}
// Ignite initializes the first call frame.
func (vm *VirtualMachine) Ignite(functionID int, params ...int64) {
if vm.ExitError != nil {
panic("last execution exited with error; cannot ignite.")
}
if vm.CurrentFrame != -1 {
panic("call stack not empty; cannot ignite.")
}
code := vm.FunctionCode[functionID]
if code.NumParams != len(params) {
panic("param count mismatch")
}
vm.Exited = false
vm.CurrentFrame++
frame := vm.GetCurrentFrame()
frame.Init(
vm,
functionID,
code,
)
copy(frame.Locals, params)
}
func (vm *VirtualMachine) AddAndCheckGas(delta uint64) bool {
newGas := vm.Gas + delta
if newGas < vm.Gas {
panic("gas overflow")
}
if vm.Config.GasLimit != 0 && newGas > vm.Config.GasLimit {
if vm.Config.ReturnOnGasLimitExceeded {
return false
}
panic("gas limit exceeded")
}
vm.Gas = newGas
return true
}
// Execute starts the virtual machines main instruction processing loop.
// This function may return at any point and is guaranteed to return
// at least once every 10000 instructions. Caller is responsible for
// detecting VM status in a loop.
func (vm *VirtualMachine) Execute() {
if vm.Exited {
panic("attempting to execute an exited vm")
}
if vm.Delegate != nil {
panic("delegate not cleared")
}
if vm.InsideExecute {
panic("vm execution is not re-entrant")
}
vm.InsideExecute = true
vm.GasLimitExceeded = false
defer func() {
vm.InsideExecute = false
if err := recover(); err != nil {
vm.Exited = true
vm.ExitError = err
vm.StackTrace = string(debug.Stack())
}
}()
frame := vm.GetCurrentFrame()
for {
valueID := int(LE.Uint32(frame.Code[frame.IP : frame.IP+4]))
ins := opcodes.Opcode(frame.Code[frame.IP+4])
frame.IP += 5
//fmt.Printf("INS: [%d] %s\n", valueID, ins.String())
switch ins {
case opcodes.Nop:
case opcodes.Unreachable:
panic("wasm: unreachable executed")
case opcodes.Select:
a := frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))]
b := frame.Regs[int(LE.Uint32(frame.Code[frame.IP+4:frame.IP+8]))]
c := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP+8:frame.IP+12]))])
frame.IP += 12
if c != 0 {
frame.Regs[valueID] = a
} else {
frame.Regs[valueID] = b
}
case opcodes.I32Const:
val := LE.Uint32(frame.Code[frame.IP : frame.IP+4])
frame.IP += 4
frame.Regs[valueID] = int64(val)
case opcodes.I32Add:
a := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])
b := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP+4:frame.IP+8]))])
frame.IP += 8
frame.Regs[valueID] = int64(a + b)
case opcodes.I32Sub:
a := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])
b := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP+4:frame.IP+8]))])
frame.IP += 8
frame.Regs[valueID] = int64(a - b)
case opcodes.I32Mul:
a := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])
b := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP+4:frame.IP+8]))])
frame.IP += 8
frame.Regs[valueID] = int64(a * b)
case opcodes.I32DivS:
a := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])
b := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP+4:frame.IP+8]))])
if b == 0 {
panic("integer division by zero")
}
if a == math.MinInt32 && b == -1 {
panic("signed integer overflow")
}
frame.IP += 8
frame.Regs[valueID] = int64(a / b)
case opcodes.I32DivU:
a := uint32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])
b := uint32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP+4:frame.IP+8]))])
if b == 0 {
panic("integer division by zero")
}
frame.IP += 8
frame.Regs[valueID] = int64(a / b)
case opcodes.I32RemS:
a := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])
b := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP+4:frame.IP+8]))])
if b == 0 {
panic("integer division by zero")
}
frame.IP += 8
frame.Regs[valueID] = int64(a % b)
case opcodes.I32RemU:
a := uint32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])
b := uint32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP+4:frame.IP+8]))])
if b == 0 {
panic("integer division by zero")
}
frame.IP += 8
frame.Regs[valueID] = int64(a % b)
case opcodes.I32And:
a := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])
b := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP+4:frame.IP+8]))])
frame.IP += 8
frame.Regs[valueID] = int64(a & b)
case opcodes.I32Or:
a := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])
b := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP+4:frame.IP+8]))])
frame.IP += 8
frame.Regs[valueID] = int64(a | b)
case opcodes.I32Xor:
a := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])
b := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP+4:frame.IP+8]))])
frame.IP += 8
frame.Regs[valueID] = int64(a ^ b)
case opcodes.I32Shl:
a := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])
b := uint32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP+4:frame.IP+8]))])
frame.IP += 8
frame.Regs[valueID] = int64(a << (b % 32))
case opcodes.I32ShrS:
a := int32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])
b := uint32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP+4:frame.IP+8]))])
frame.IP += 8
frame.Regs[valueID] = int64(a >> (b % 32))
case opcodes.I32ShrU:
a := uint32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])
b := uint32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP+4:frame.IP+8]))])
frame.IP += 8
frame.Regs[valueID] = int64(a >> (b % 32))
case opcodes.I32Rotl:
a := uint32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])
b := uint32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP+4:frame.IP+8]))])
frame.IP += 8
frame.Regs[valueID] = int64(bits.RotateLeft32(a, int(b)))
case opcodes.I32Rotr:
a := uint32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])
b := uint32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP+4:frame.IP+8]))])
frame.IP += 8
frame.Regs[valueID] = int64(bits.RotateLeft32(a, -int(b)))
case opcodes.I32Clz:
val := uint32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])
frame.IP += 4
frame.Regs[valueID] = int64(bits.LeadingZeros32(val))
case opcodes.I32Ctz:
val := uint32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])
frame.IP += 4
frame.Regs[valueID] = int64(bits.TrailingZeros32(val))
case opcodes.I32PopCnt:
val := uint32(frame.Regs[int(LE.Uint32(frame.Code[frame.IP:frame.IP+4]))])