core/vm: reverse bit order in bytes of code bitmap (#24120)
* core/vm: reverse bit order in bytes of code bitmap This bit order is more natural for bit manipulation operations and we can eliminate some small number of CPU instructions. * core/vm: drop lookup table
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@ -17,12 +17,12 @@
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package vm
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const (
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set2BitsMask = uint16(0b1100_0000_0000_0000)
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set3BitsMask = uint16(0b1110_0000_0000_0000)
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set4BitsMask = uint16(0b1111_0000_0000_0000)
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set5BitsMask = uint16(0b1111_1000_0000_0000)
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set6BitsMask = uint16(0b1111_1100_0000_0000)
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set7BitsMask = uint16(0b1111_1110_0000_0000)
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set2BitsMask = uint16(0b11)
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set3BitsMask = uint16(0b111)
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set4BitsMask = uint16(0b1111)
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set5BitsMask = uint16(0b1_1111)
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set6BitsMask = uint16(0b11_1111)
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set7BitsMask = uint16(0b111_1111)
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)
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// bitvec is a bit vector which maps bytes in a program.
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@ -30,32 +30,26 @@ const (
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// it's data (i.e. argument of PUSHxx).
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type bitvec []byte
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var lookup = [8]byte{
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0x80, 0x40, 0x20, 0x10, 0x8, 0x4, 0x2, 0x1,
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}
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func (bits bitvec) set1(pos uint64) {
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bits[pos/8] |= lookup[pos%8]
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bits[pos/8] |= 1 << (pos % 8)
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}
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func (bits bitvec) setN(flag uint16, pos uint64) {
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a := flag >> (pos % 8)
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bits[pos/8] |= byte(a >> 8)
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if b := byte(a); b != 0 {
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// If the bit-setting affects the neighbouring byte, we can assign - no need to OR it,
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// since it's the first write to that byte
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a := flag << (pos % 8)
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bits[pos/8] |= byte(a)
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if b := byte(a >> 8); b != 0 {
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bits[pos/8+1] = b
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}
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}
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func (bits bitvec) set8(pos uint64) {
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a := byte(0xFF >> (pos % 8))
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a := byte(0xFF << (pos % 8))
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bits[pos/8] |= a
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bits[pos/8+1] = ^a
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}
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func (bits bitvec) set16(pos uint64) {
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a := byte(0xFF >> (pos % 8))
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a := byte(0xFF << (pos % 8))
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bits[pos/8] |= a
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bits[pos/8+1] = 0xFF
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bits[pos/8+2] = ^a
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@ -63,7 +57,7 @@ func (bits bitvec) set16(pos uint64) {
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// codeSegment checks if the position is in a code segment.
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func (bits *bitvec) codeSegment(pos uint64) bool {
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return ((*bits)[pos/8] & (0x80 >> (pos % 8))) == 0
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return (((*bits)[pos/8] >> (pos % 8)) & 1) == 0
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}
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// codeBitmap collects data locations in code.
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@ -17,6 +17,7 @@
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package vm
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import (
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"math/bits"
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"testing"
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"github.com/ethereum/go-ethereum/crypto"
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@ -28,24 +29,27 @@ func TestJumpDestAnalysis(t *testing.T) {
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exp byte
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which int
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}{
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{[]byte{byte(PUSH1), 0x01, 0x01, 0x01}, 0x40, 0},
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{[]byte{byte(PUSH1), byte(PUSH1), byte(PUSH1), byte(PUSH1)}, 0x50, 0},
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{[]byte{byte(PUSH8), byte(PUSH8), byte(PUSH8), byte(PUSH8), byte(PUSH8), byte(PUSH8), byte(PUSH8), byte(PUSH8), 0x01, 0x01, 0x01}, 0x7F, 0},
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{[]byte{byte(PUSH8), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0x80, 1},
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{[]byte{0x01, 0x01, 0x01, 0x01, 0x01, byte(PUSH2), byte(PUSH2), byte(PUSH2), 0x01, 0x01, 0x01}, 0x03, 0},
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{[]byte{0x01, 0x01, 0x01, 0x01, 0x01, byte(PUSH2), 0x01, 0x01, 0x01, 0x01, 0x01}, 0x00, 1},
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{[]byte{byte(PUSH3), 0x01, 0x01, 0x01, byte(PUSH1), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0x74, 0},
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{[]byte{byte(PUSH3), 0x01, 0x01, 0x01, byte(PUSH1), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0x00, 1},
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{[]byte{0x01, byte(PUSH8), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0x3F, 0},
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{[]byte{0x01, byte(PUSH8), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0xC0, 1},
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{[]byte{byte(PUSH16), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0x7F, 0},
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{[]byte{byte(PUSH16), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0xFF, 1},
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{[]byte{byte(PUSH16), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0x80, 2},
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{[]byte{byte(PUSH8), 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, byte(PUSH1), 0x01}, 0x7f, 0},
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{[]byte{byte(PUSH8), 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, byte(PUSH1), 0x01}, 0xA0, 1},
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{[]byte{byte(PUSH32)}, 0x7F, 0},
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{[]byte{byte(PUSH32)}, 0xFF, 1},
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{[]byte{byte(PUSH32)}, 0xFF, 2},
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{[]byte{byte(PUSH1), 0x01, 0x01, 0x01}, 0b0000_0010, 0},
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{[]byte{byte(PUSH1), byte(PUSH1), byte(PUSH1), byte(PUSH1)}, 0b0000_1010, 0},
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{[]byte{0x00, byte(PUSH1), 0x00, byte(PUSH1), 0x00, byte(PUSH1), 0x00, byte(PUSH1)}, 0b0101_0100, 0},
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{[]byte{byte(PUSH8), byte(PUSH8), byte(PUSH8), byte(PUSH8), byte(PUSH8), byte(PUSH8), byte(PUSH8), byte(PUSH8), 0x01, 0x01, 0x01}, bits.Reverse8(0x7F), 0},
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{[]byte{byte(PUSH8), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0b0000_0001, 1},
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{[]byte{0x01, 0x01, 0x01, 0x01, 0x01, byte(PUSH2), byte(PUSH2), byte(PUSH2), 0x01, 0x01, 0x01}, 0b1100_0000, 0},
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{[]byte{0x01, 0x01, 0x01, 0x01, 0x01, byte(PUSH2), 0x01, 0x01, 0x01, 0x01, 0x01}, 0b0000_0000, 1},
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{[]byte{byte(PUSH3), 0x01, 0x01, 0x01, byte(PUSH1), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0b0010_1110, 0},
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{[]byte{byte(PUSH3), 0x01, 0x01, 0x01, byte(PUSH1), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0b0000_0000, 1},
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{[]byte{0x01, byte(PUSH8), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0b1111_1100, 0},
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{[]byte{0x01, byte(PUSH8), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0b0000_0011, 1},
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{[]byte{byte(PUSH16), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0b1111_1110, 0},
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{[]byte{byte(PUSH16), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0b1111_1111, 1},
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{[]byte{byte(PUSH16), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0b0000_0001, 2},
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{[]byte{byte(PUSH8), 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, byte(PUSH1), 0x01}, 0b1111_1110, 0},
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{[]byte{byte(PUSH8), 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, byte(PUSH1), 0x01}, 0b0000_0101, 1},
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{[]byte{byte(PUSH32)}, 0b1111_1110, 0},
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{[]byte{byte(PUSH32)}, 0b1111_1111, 1},
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{[]byte{byte(PUSH32)}, 0b1111_1111, 2},
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{[]byte{byte(PUSH32)}, 0b1111_1111, 3},
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{[]byte{byte(PUSH32)}, 0b0000_0001, 4},
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}
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for i, test := range tests {
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ret := codeBitmap(test.code)
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