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dropped masks

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This commit is contained in:
lmittmann 2024-03-30 20:57:05 +01:00
parent ae0edbf0d0
commit 36a4609150
1 changed files with 6 additions and 41 deletions
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47
core/vm/analysis.go
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@ -133,11 +133,11 @@ func (bv bitVec) codeBitVec(code []byte) bitVec {
var pc uint64 var pc uint64
for pc < uint64(len(code)) { for pc < uint64(len(code)) {
op := code[pc] op := code[pc]
if int8(op) < 0x60 { if int8(op) < int8(PUSH1) {
pc++ pc++
continue // continue if the OpCode is not PUSH1..32 continue // continue if the OpCode is not PUSH1..32
} }
numBytes := op - 0x5f // number of data bytes pushed numBytes := op - uint8(PUSH0) // number of data bytes pushed
shift := uint8((pc + 1) % 32) shift := uint8((pc + 1) % 32)
i := (pc + 1) / 32 i := (pc + 1) / 32
@ -146,12 +146,12 @@ func (bv bitVec) codeBitVec(code []byte) bitVec {
bv[i] |= 1 << shift bv[i] |= 1 << shift
pc += 2 pc += 2
case 32: case 32:
a := masks[numBytes] << shift a := uint32(0xffffffff) << shift
bv[i] |= uint32(a) bv[i] |= a
bv[i+1] = uint32(^a) bv[i+1] = ^a
pc += 33 pc += 33
default: default:
a := masks[numBytes] << shift a := (uint64(1<<numBytes) - 1) << shift
bv[i] |= uint32(a) bv[i] |= uint32(a)
bv[i+1] = uint32(a >> 32) bv[i+1] = uint32(a >> 32)
pc += uint64(numBytes + 1) pc += uint64(numBytes + 1)
@ -159,38 +159,3 @@ func (bv bitVec) codeBitVec(code []byte) bitVec {
} }
return bv return bv
} }
var masks = [256]uint64{
1: 0b00000000_00000000_00000000_00000001,
2: 0b00000000_00000000_00000000_00000011,
3: 0b00000000_00000000_00000000_00000111,
4: 0b00000000_00000000_00000000_00001111,
5: 0b00000000_00000000_00000000_00011111,
6: 0b00000000_00000000_00000000_00111111,
7: 0b00000000_00000000_00000000_01111111,
8: 0b00000000_00000000_00000000_11111111,
9: 0b00000000_00000000_00000001_11111111,
10: 0b00000000_00000000_00000011_11111111,
11: 0b00000000_00000000_00000111_11111111,
12: 0b00000000_00000000_00001111_11111111,
13: 0b00000000_00000000_00011111_11111111,
14: 0b00000000_00000000_00111111_11111111,
15: 0b00000000_00000000_01111111_11111111,
16: 0b00000000_00000000_11111111_11111111,
17: 0b00000000_00000001_11111111_11111111,
18: 0b00000000_00000011_11111111_11111111,
19: 0b00000000_00000111_11111111_11111111,
20: 0b00000000_00001111_11111111_11111111,
21: 0b00000000_00011111_11111111_11111111,
22: 0b00000000_00111111_11111111_11111111,
23: 0b00000000_01111111_11111111_11111111,
24: 0b00000000_11111111_11111111_11111111,
25: 0b00000001_11111111_11111111_11111111,
26: 0b00000011_11111111_11111111_11111111,
27: 0b00000111_11111111_11111111_11111111,
28: 0b00001111_11111111_11111111_11111111,
29: 0b00011111_11111111_11111111_11111111,
30: 0b00111111_11111111_11111111_11111111,
31: 0b01111111_11111111_11111111_11111111,
32: 0b11111111_11111111_11111111_11111111,
}