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vm: implement MEMCPY opcode

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MEMCPY copies byte-slice to a destination buffer.
This commit is contained in:
Evgenii Stratonikov 2020-05-12 14:55:31 +03:00
parent a5f6e0e53d
commit 98c508d361
4 changed files with 96 additions and 57 deletions
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1
pkg/vm/opcode/opcode.go
View file

@ -147,6 +147,7 @@ const (
// Splice
NEWBUFFER Opcode = 0x88
MEMCPY Opcode = 0x89
CAT Opcode = 0x8B
SUBSTR Opcode = 0x8C
LEFT Opcode = 0x8D

116
pkg/vm/opcode/opcode_string.go
View file

@ -133,6 +133,7 @@ func _() {
_ = x[STARG6-134]
_ = x[STARG-135]
_ = x[NEWBUFFER-136]
_ = x[MEMCPY-137]
_ = x[CAT-139]
_ = x[SUBSTR-140]
_ = x[LEFT-141]
@ -191,7 +192,7 @@ func _() {
_ = x[CONVERT-219]
}
const _Opcode_name = "PUSHINT8PUSHINT16PUSHINT32PUSHINT64PUSHINT128PUSHINT256PUSHAPUSHNULLPUSHDATA1PUSHDATA2PUSHDATA4PUSHM1PUSH0PUSH1PUSH2PUSH3PUSH4PUSH5PUSH6PUSH7PUSH8PUSH9PUSH10PUSH11PUSH12PUSH13PUSH14PUSH15PUSH16NOPJMPJMPLJMPIFJMPIFLJMPIFNOTJMPIFNOTLJMPEQJMPEQLJMPNEJMPNELJMPGTJMPGTLJMPGEJMPGELJMPLTJMPLTLJMPLEJMPLELCALLCALLLCALLAABORTASSERTTHROWRETSYSCALLDEPTHDROPNIPXDROPCLEARDUPOVERPICKTUCKSWAPOLDPUSH1ROLLREVERSE3REVERSE4REVERSENINITSSLOTINITSLOTLDSFLD0LDSFLD1LDSFLD2LDSFLD3LDSFLD4LDSFLD5LDSFLD6LDSFLDSTSFLD0STSFLD1STSFLD2STSFLD3STSFLD4STSFLD5STSFLD6STSFLDLDLOC0LDLOC1LDLOC2LDLOC3LDLOC4LDLOC5LDLOC6LDLOCSTLOC0STLOC1STLOC2STLOC3STLOC4STLOC5STLOC6STLOCLDARG0LDARG1LDARG2LDARG3LDARG4LDARG5LDARG6LDARGSTARG0STARG1STARG2STARG3STARG4STARG5STARG6STARGNEWBUFFERCATSUBSTRLEFTRIGHTINVERTANDORXOREQUALNOTEQUALSIGNABSNEGATEINCDECADDSUBMULDIVMODSHLSHRNOTBOOLANDBOOLORNZNUMEQUALNUMNOTEQUALLTLTEGTGTEMINMAXWITHINPACKUNPACKNEWARRAY0NEWARRAYNEWARRAYTNEWSTRUCT0NEWSTRUCTNEWMAPSIZEHASKEYKEYSVALUESPICKITEMAPPENDSETITEMREVERSEITEMSREMOVECLEARITEMSISNULLISTYPECONVERT"
const _Opcode_name = "PUSHINT8PUSHINT16PUSHINT32PUSHINT64PUSHINT128PUSHINT256PUSHAPUSHNULLPUSHDATA1PUSHDATA2PUSHDATA4PUSHM1PUSH0PUSH1PUSH2PUSH3PUSH4PUSH5PUSH6PUSH7PUSH8PUSH9PUSH10PUSH11PUSH12PUSH13PUSH14PUSH15PUSH16NOPJMPJMPLJMPIFJMPIFLJMPIFNOTJMPIFNOTLJMPEQJMPEQLJMPNEJMPNELJMPGTJMPGTLJMPGEJMPGELJMPLTJMPLTLJMPLEJMPLELCALLCALLLCALLAABORTASSERTTHROWRETSYSCALLDEPTHDROPNIPXDROPCLEARDUPOVERPICKTUCKSWAPOLDPUSH1ROLLREVERSE3REVERSE4REVERSENINITSSLOTINITSLOTLDSFLD0LDSFLD1LDSFLD2LDSFLD3LDSFLD4LDSFLD5LDSFLD6LDSFLDSTSFLD0STSFLD1STSFLD2STSFLD3STSFLD4STSFLD5STSFLD6STSFLDLDLOC0LDLOC1LDLOC2LDLOC3LDLOC4LDLOC5LDLOC6LDLOCSTLOC0STLOC1STLOC2STLOC3STLOC4STLOC5STLOC6STLOCLDARG0LDARG1LDARG2LDARG3LDARG4LDARG5LDARG6LDARGSTARG0STARG1STARG2STARG3STARG4STARG5STARG6STARGNEWBUFFERMEMCPYCATSUBSTRLEFTRIGHTINVERTANDORXOREQUALNOTEQUALSIGNABSNEGATEINCDECADDSUBMULDIVMODSHLSHRNOTBOOLANDBOOLORNZNUMEQUALNUMNOTEQUALLTLTEGTGTEMINMAXWITHINPACKUNPACKNEWARRAY0NEWARRAYNEWARRAYTNEWSTRUCT0NEWSTRUCTNEWMAPSIZEHASKEYKEYSVALUESPICKITEMAPPENDSETITEMREVERSEITEMSREMOVECLEARITEMSISNULLISTYPECONVERT"
var _Opcode_map = map[Opcode]string{
0: _Opcode_name[0:8],
@ -316,62 +317,63 @@ var _Opcode_map = map[Opcode]string{
134: _Opcode_name[718:724],
135: _Opcode_name[724:729],
136: _Opcode_name[729:738],
139: _Opcode_name[738:741],
140: _Opcode_name[741:747],
141: _Opcode_name[747:751],
142: _Opcode_name[751:756],
144: _Opcode_name[756:762],
145: _Opcode_name[762:765],
146: _Opcode_name[765:767],
147: _Opcode_name[767:770],
151: _Opcode_name[770:775],
152: _Opcode_name[775:783],
153: _Opcode_name[783:787],
154: _Opcode_name[787:790],
155: _Opcode_name[790:796],
156: _Opcode_name[796:799],
157: _Opcode_name[799:802],
158: _Opcode_name[802:805],
159: _Opcode_name[805:808],
160: _Opcode_name[808:811],
161: _Opcode_name[811:814],
162: _Opcode_name[814:817],
168: _Opcode_name[817:820],
169: _Opcode_name[820:823],
170: _Opcode_name[823:826],
171: _Opcode_name[826:833],
172: _Opcode_name[833:839],
177: _Opcode_name[839:841],
179: _Opcode_name[841:849],
180: _Opcode_name[849:860],
181: _Opcode_name[860:862],
182: _Opcode_name[862:865],
183: _Opcode_name[865:867],
184: _Opcode_name[867:870],
185: _Opcode_name[870:873],
186: _Opcode_name[873:876],
187: _Opcode_name[876:882],
192: _Opcode_name[882:886],
193: _Opcode_name[886:892],
194: _Opcode_name[892:901],
195: _Opcode_name[901:909],
196: _Opcode_name[909:918],
197: _Opcode_name[918:928],
198: _Opcode_name[928:937],
200: _Opcode_name[937:943],
202: _Opcode_name[943:947],
203: _Opcode_name[947:953],
204: _Opcode_name[953:957],
205: _Opcode_name[957:963],
206: _Opcode_name[963:971],
207: _Opcode_name[971:977],
208: _Opcode_name[977:984],
209: _Opcode_name[984:996],
210: _Opcode_name[996:1002],
211: _Opcode_name[1002:1012],
216: _Opcode_name[1012:1018],
217: _Opcode_name[1018:1024],
219: _Opcode_name[1024:1031],
137: _Opcode_name[738:744],
139: _Opcode_name[744:747],
140: _Opcode_name[747:753],
141: _Opcode_name[753:757],
142: _Opcode_name[757:762],
144: _Opcode_name[762:768],
145: _Opcode_name[768:771],
146: _Opcode_name[771:773],
147: _Opcode_name[773:776],
151: _Opcode_name[776:781],
152: _Opcode_name[781:789],
153: _Opcode_name[789:793],
154: _Opcode_name[793:796],
155: _Opcode_name[796:802],
156: _Opcode_name[802:805],
157: _Opcode_name[805:808],
158: _Opcode_name[808:811],
159: _Opcode_name[811:814],
160: _Opcode_name[814:817],
161: _Opcode_name[817:820],
162: _Opcode_name[820:823],
168: _Opcode_name[823:826],
169: _Opcode_name[826:829],
170: _Opcode_name[829:832],
171: _Opcode_name[832:839],
172: _Opcode_name[839:845],
177: _Opcode_name[845:847],
179: _Opcode_name[847:855],
180: _Opcode_name[855:866],
181: _Opcode_name[866:868],
182: _Opcode_name[868:871],
183: _Opcode_name[871:873],
184: _Opcode_name[873:876],
185: _Opcode_name[876:879],
186: _Opcode_name[879:882],
187: _Opcode_name[882:888],
192: _Opcode_name[888:892],
193: _Opcode_name[892:898],
194: _Opcode_name[898:907],
195: _Opcode_name[907:915],
196: _Opcode_name[915:924],
197: _Opcode_name[924:934],
198: _Opcode_name[934:943],
200: _Opcode_name[943:949],
202: _Opcode_name[949:953],
203: _Opcode_name[953:959],
204: _Opcode_name[959:963],
205: _Opcode_name[963:969],
206: _Opcode_name[969:977],
207: _Opcode_name[977:983],
208: _Opcode_name[983:990],
209: _Opcode_name[990:1002],
210: _Opcode_name[1002:1008],
211: _Opcode_name[1008:1018],
216: _Opcode_name[1018:1024],
217: _Opcode_name[1024:1030],
219: _Opcode_name[1030:1037],
}
func (i Opcode) String() string {

23
pkg/vm/vm.go
View file

@ -642,6 +642,29 @@ func (v *VM) execute(ctx *Context, op opcode.Opcode, parameter []byte) (err erro
}
v.estack.PushVal(NewBufferItem(make([]byte, n)))
case opcode.MEMCPY:
n := toInt(v.estack.Pop().BigInt())
if n < 0 {
panic("invalid size")
}
si := toInt(v.estack.Pop().BigInt())
if si < 0 {
panic("invalid source index")
}
src := v.estack.Pop().Bytes()
if sum := si + n; sum < 0 || sum > len(src) {
panic("size is too big")
}
di := toInt(v.estack.Pop().BigInt())
if di < 0 {
panic("invalid destination index")
}
dst := v.estack.Pop().value.(*BufferItem).value
if sum := si + n; sum < 0 || sum > len(dst) {
panic("size is too big")
}
copy(dst[di:], src[si:si+n])
case opcode.CAT:
b := v.estack.Pop().Bytes()
a := v.estack.Pop().Bytes()

13
pkg/vm/vm_test.go
View file

@ -1161,6 +1161,19 @@ func TestNEWBUFFER(t *testing.T) {
t.Run("TooBig", getTestFuncForVM(prog, nil, MaxItemSize+1))
}
func TestMEMCPY(t *testing.T) {
prog := makeProgram(opcode.MEMCPY)
t.Run("Good", func(t *testing.T) {
buf := NewBufferItem([]byte{0, 1, 2, 3})
runWithArgs(t, prog, NewBufferItem([]byte{0, 6, 7, 3}), buf, buf, 1, []byte{4, 5, 6, 7}, 2, 2)
})
t.Run("NegativeSize", getTestFuncForVM(prog, nil, NewBufferItem([]byte{0, 1}), 0, []byte{2}, 0, -1))
t.Run("NegativeSrcIndex", getTestFuncForVM(prog, nil, NewBufferItem([]byte{0, 1}), 0, []byte{2}, -1, 1))
t.Run("NegativeDstIndex", getTestFuncForVM(prog, nil, NewBufferItem([]byte{0, 1}), -1, []byte{2}, 0, 1))
t.Run("BigSizeSrc", getTestFuncForVM(prog, nil, NewBufferItem([]byte{0, 1}), 0, []byte{2}, 0, 2))
t.Run("BigSizeDst", getTestFuncForVM(prog, nil, NewBufferItem([]byte{0, 1}), 0, []byte{2, 3, 4}, 0, 3))
}
func TestNEWARRAY0(t *testing.T) {
prog := makeProgram(opcode.NEWARRAY0)
runWithArgs(t, prog, []StackItem{})