276 lines
14 KiB
Rust
276 lines
14 KiB
Rust
use core::fmt::Debug;
|
|
|
|
pub struct Bytecode {
|
|
pub bytes: Box<[u8]>
|
|
}
|
|
|
|
impl Bytecode {
|
|
|
|
pub fn next_instruction(&self, offset: usize) -> (Instruction, usize) {
|
|
let opcode = self.bytes[offset];
|
|
|
|
match opcode {
|
|
0x00 => (Instruction::NoOperation(), 1),
|
|
0x01 => (Instruction::PushNull(), 1),
|
|
0x02 => (Instruction::PushConstIntM1(), 1),
|
|
0x03 => (Instruction::PushConstInt0(), 1),
|
|
0x04 => (Instruction::PushConstInt1(), 1),
|
|
0x05 => (Instruction::PushConstInt2(), 1),
|
|
0x06 => (Instruction::PushConstInt3(), 1),
|
|
0x07 => (Instruction::PushConstInt4(), 1),
|
|
0x08 => (Instruction::PushConstInt5(), 1),
|
|
0x0E => (Instruction::PushConstDouble0(), 1),
|
|
0x0F => (Instruction::PushConstDouble1(), 1),
|
|
|
|
0x10 => (Instruction::LoadByteImmediate(self.bytes[offset+1]), 2),
|
|
0x11 => (Instruction::LoadShortImmediate((self.bytes[offset+1] as u16) << 8 | self.bytes[offset+2] as u16), 3),
|
|
0x12 => (Instruction::LoadConstant(self.bytes[offset+1]), 2),
|
|
0x13 => (Instruction::LoadCostantWide((self.bytes[offset+1] as u16) << 8 | self.bytes[offset+2] as u16), 3),
|
|
0x14 => (Instruction::LoadConstant64((self.bytes[offset+1] as u16) << 8 | self.bytes[offset+2] as u16), 3),
|
|
|
|
0x1A => (Instruction::LoadLocalInt0(), 1),
|
|
0x1B => (Instruction::LoadLocalInt1(), 1),
|
|
0x1C => (Instruction::LoadLocalInt2(), 1),
|
|
0x1D => (Instruction::LoadLocalInt3(), 1),
|
|
0x26 => (Instruction::LoadLocalDouble0(), 1),
|
|
0x27 => (Instruction::LoadLocalDouble1(), 1),
|
|
0x28 => (Instruction::LoadLocalDouble2(), 1),
|
|
0x29 => (Instruction::LoadLocalDouble3(), 1),
|
|
0x2A => (Instruction::LoadLocalReference0(), 1),
|
|
0x2B => (Instruction::LoadLocalReference1(), 1),
|
|
0x2C => (Instruction::LoadLocalReference2(), 1),
|
|
0x2D => (Instruction::LoadLocalReference3(), 1),
|
|
|
|
0x32 => (Instruction::ArrayElement(), 1),
|
|
0x36 => (Instruction::StoreLocalInt(self.bytes[offset+1]), 2),
|
|
0x3B => (Instruction::StoreLocalInt0(), 1),
|
|
0x3C => (Instruction::StoreLocalInt1(), 1),
|
|
0x3D => (Instruction::StoreLocalInt2(), 1),
|
|
0x3E => (Instruction::StoreLocalInt3(), 1),
|
|
0x4B => (Instruction::StoreReference0(), 1),
|
|
0x4C => (Instruction::StoreReference1(), 1),
|
|
0x4D => (Instruction::StoreReference2(), 1),
|
|
0x4E => (Instruction::StoreReference3(), 1),
|
|
|
|
0x53 => (Instruction::StoreIntoRArray(), 1),
|
|
0x54 => (Instruction::StoreIntoBArray(), 1),
|
|
|
|
0x57 => (Instruction::Pop(), 1),
|
|
0x59 => (Instruction::Duplicate(), 1),
|
|
|
|
0x68 => (Instruction::MultiplyInt(), 1),
|
|
0x6C => (Instruction::DivideInt(), 1),
|
|
0x6D => (Instruction::DivideLong(), 1),
|
|
|
|
0x7A => (Instruction::ShiftIntRight(), 1),
|
|
|
|
0x80 => (Instruction::OrInt(), 1),
|
|
|
|
0x99 => {
|
|
let bytes = [self.bytes[offset+1], self.bytes[offset+2]];
|
|
(Instruction::BranchZero(i16::from_be_bytes(bytes)), 3)
|
|
}
|
|
0x9A => {
|
|
let bytes = [self.bytes[offset+1], self.bytes[offset+2]];
|
|
(Instruction::BranchNonZero(i16::from_be_bytes(bytes)), 3)
|
|
}
|
|
0x9B => {
|
|
let bytes = [self.bytes[offset+1], self.bytes[offset+2]];
|
|
(Instruction::BranchNegative(i16::from_be_bytes(bytes)), 3)
|
|
}
|
|
0x9C => {
|
|
let bytes = [self.bytes[offset+1], self.bytes[offset+2]];
|
|
(Instruction::BranchNonPositive(i16::from_be_bytes(bytes)), 3)
|
|
}
|
|
0x9D => {
|
|
let bytes = [self.bytes[offset+1], self.bytes[offset+2]];
|
|
(Instruction::BranchPositive(i16::from_be_bytes(bytes)), 3)
|
|
}
|
|
0x9E => {
|
|
let bytes = [self.bytes[offset+1], self.bytes[offset+2]];
|
|
(Instruction::BranchNonNegative(i16::from_be_bytes(bytes)), 3)
|
|
}
|
|
|
|
0x9F => {
|
|
let bytes = [self.bytes[offset+1], self.bytes[offset+2]];
|
|
(Instruction::BranchIntEquality(i16::from_be_bytes(bytes)), 3)
|
|
}
|
|
0xA0 => {
|
|
let bytes = [self.bytes[offset+1], self.bytes[offset+2]];
|
|
(Instruction::BranchIntInequality(i16::from_be_bytes(bytes)), 3)
|
|
}
|
|
0xA1 => {
|
|
let bytes = [self.bytes[offset+1], self.bytes[offset+2]];
|
|
(Instruction::BranchIntLessThan(i16::from_be_bytes(bytes)), 3)
|
|
}
|
|
0xA2 => {
|
|
let bytes = [self.bytes[offset+1], self.bytes[offset+2]];
|
|
(Instruction::BranchIntGreaterEquals(i16::from_be_bytes(bytes)), 3)
|
|
}
|
|
0xA3 => {
|
|
let bytes = [self.bytes[offset+1], self.bytes[offset+2]];
|
|
(Instruction::BranchIntGreaterThan(i16::from_be_bytes(bytes)), 3)
|
|
}
|
|
0xA4 => {
|
|
let bytes = [self.bytes[offset+1], self.bytes[offset+2]];
|
|
(Instruction::BranchIntLessEquals(i16::from_be_bytes(bytes)), 3)
|
|
}
|
|
|
|
0xAC => (Instruction::ReturnInt(), 1),
|
|
0xA7 => {
|
|
let bytes = [self.bytes[offset+1], self.bytes[offset+2]];
|
|
(Instruction::BranchAlways(i16::from_be_bytes(bytes)), 3)
|
|
}
|
|
|
|
0xB0 => (Instruction::ReturnReference(), 1),
|
|
0xB1 => (Instruction::ReturnVoid(), 1),
|
|
0xB2 => (Instruction::GetStatic((self.bytes[offset+1] as u16) << 8 | self.bytes[offset+2] as u16), 3),
|
|
0xB3 => (Instruction::PutStatic((self.bytes[offset+1] as u16) << 8 | self.bytes[offset+2] as u16), 3),
|
|
0xB4 => (Instruction::GetField((self.bytes[offset+1] as u16) << 8 | self.bytes[offset+2] as u16), 3),
|
|
0xB5 => (Instruction::PutField((self.bytes[offset+1] as u16) << 8 | self.bytes[offset+2] as u16), 3),
|
|
0xB6 => (Instruction::InvokeVirtual((self.bytes[offset+1] as u16) << 8 | self.bytes[offset+2] as u16), 3),
|
|
0xB7 => (Instruction::InvokeSpecial((self.bytes[offset+1] as u16) << 8 | self.bytes[offset+2] as u16), 3),
|
|
0xB8 => (Instruction::InvokeStatic((self.bytes[offset+1] as u16) << 8 | self.bytes[offset+2] as u16), 3),
|
|
0xBA => (Instruction::InvokeDynamic((self.bytes[offset+1] as u16) << 8 | self.bytes[offset+2] as u16, (self.bytes[offset+3] as u16) << 8 | self.bytes[offset+4] as u16), 5),
|
|
0xBB => (Instruction::NewObject((self.bytes[offset+1] as u16) << 8 | self.bytes[offset+2] as u16), 3),
|
|
0xBC => (Instruction::NewPrimitiveArray(self.bytes[offset+1]), 2),
|
|
0xBD => (Instruction::NewArray((self.bytes[offset+1] as u16) << 8 | self.bytes[offset+2] as u16), 3),
|
|
0xBE => (Instruction::ArrayLength(), 1),
|
|
|
|
0xC2 => (Instruction::EnterMonitor(), 1),
|
|
0xC3 => (Instruction::ExitMonitor(), 1),
|
|
|
|
0xC6 => {
|
|
let bytes = [self.bytes[offset+1], self.bytes[offset+2]];
|
|
(Instruction::BranchNull(i16::from_be_bytes(bytes)), 3)
|
|
}
|
|
0xC7 => {
|
|
let bytes = [self.bytes[offset+1], self.bytes[offset+2]];
|
|
(Instruction::BranchNonNull(i16::from_be_bytes(bytes)), 3)
|
|
}
|
|
_ => (Instruction::Unknown(opcode), 1)
|
|
}
|
|
}
|
|
|
|
pub fn instructions(&self) -> Box<[Instruction]> {
|
|
let mut v = Vec::with_capacity(self.bytes.len());
|
|
|
|
let mut i = 0;
|
|
while i < self.bytes.len() {
|
|
|
|
let (instruction, offset) = self.next_instruction(i);
|
|
|
|
v.push(instruction);
|
|
i += offset;
|
|
}
|
|
|
|
v.into_boxed_slice()
|
|
}
|
|
}
|
|
|
|
impl Debug for Bytecode {
|
|
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
|
|
f.debug_list()
|
|
.entries(self.instructions())
|
|
.finish()
|
|
}
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
#[repr(u8)]
|
|
pub enum Instruction {
|
|
NoOperation() = 0x00, // No-Operation
|
|
PushNull() = 0x01, // ..., arrayref, index, value
|
|
PushConstIntM1() = 0x02, // Push -1
|
|
PushConstInt0() = 0x03, // Push 0
|
|
PushConstInt1() = 0x04, // Push 1
|
|
PushConstInt2() = 0x05, // Push 2
|
|
PushConstInt3() = 0x06, // Push 3
|
|
PushConstInt4() = 0x07, // Push 4
|
|
PushConstInt5() = 0x08, // Push 5
|
|
PushConstDouble0() = 0x0E, // Push 0.0
|
|
PushConstDouble1() = 0x0F, // Push 1.0
|
|
|
|
LoadByteImmediate(u8) = 0x10, // push immediate short
|
|
LoadShortImmediate(u16) = 0x11, // push immediate short
|
|
LoadConstant(u8) = 0x12, // Push from constant pool
|
|
LoadCostantWide(u16) = 0x13, // Push from constant pool with wide index, don't load
|
|
// double or long or whatever
|
|
LoadConstant64(u16) = 0x14, // Push Long or Double from constant pool
|
|
LoadLocalInt0() = 0x1A, // Load int from local variable
|
|
LoadLocalInt1() = 0x1B, // Load int from local variable
|
|
LoadLocalInt2() = 0x1C, // Load int from local variable
|
|
LoadLocalInt3() = 0x1D, // Load int from local variable
|
|
|
|
LoadLocalDouble0() = 0x26, // Load local double variable reference onto stack
|
|
LoadLocalDouble1() = 0x27, // Load local double variable reference onto stack
|
|
LoadLocalDouble2() = 0x28, // Load local double variable reference onto stack
|
|
LoadLocalDouble3() = 0x29, // Load local double variable reference onto stack
|
|
LoadLocalReference0() = 0x2A, // Load local reference variable reference onto stack
|
|
LoadLocalReference1() = 0x2B, // Load local reference variable reference onto stack
|
|
LoadLocalReference2() = 0x2C, // Load local reference variable reference onto stack
|
|
LoadLocalReference3() = 0x2D, // Load local reference variable reference onto stack
|
|
|
|
ArrayElement() = 0x32, // load element from array
|
|
StoreLocalInt(u8) = 0x36, // store into indexed local variable
|
|
StoreLocalInt0() = 0x3B, // store int into local variable
|
|
StoreLocalInt1() = 0x3C, // store int into local variable
|
|
StoreLocalInt2() = 0x3D, // store int into local variable
|
|
StoreLocalInt3() = 0x3E, // store int into local variable
|
|
StoreReference0() = 0x4B, // store reference into local variable
|
|
StoreReference1() = 0x4C, // store reference into local variable
|
|
StoreReference2() = 0x4D, // store reference into local variable
|
|
StoreReference3() = 0x4E, // store reference into local variable
|
|
|
|
StoreIntoRArray() = 0x53, // store value into reference array
|
|
StoreIntoBArray() = 0x54, // store value into byte or boolean array
|
|
Pop() = 0x57, // Pop top stack value
|
|
Duplicate() = 0x59, // duplicate top stack value
|
|
|
|
MultiplyInt() = 0x68, // int multiplication
|
|
DivideInt() = 0x6C, // integer division, round toward zero and more rules
|
|
DivideLong() = 0x6D, // long division
|
|
|
|
ShiftIntRight() = 0x7a, // shift int
|
|
|
|
OrInt() = 0x80, // value, value => or
|
|
|
|
BranchZero(i16) = 0x99, // branch if value == 0
|
|
BranchNonZero(i16) = 0x9A, // branch if value != 0
|
|
BranchNegative(i16) = 0x9B, // branch if value < 0
|
|
BranchNonPositive(i16) = 0x9C, // branch if value <= 0
|
|
BranchPositive(i16) = 0x9D, // branch if value > 0
|
|
BranchNonNegative(i16) = 0x9E, // branch if value >= 0
|
|
|
|
BranchIntEquality(i16) = 0x9F,
|
|
BranchIntInequality(i16) = 0xA0,
|
|
BranchIntLessThan(i16) = 0xA1,
|
|
BranchIntGreaterEquals(i16) = 0xA2,
|
|
BranchIntGreaterThan(i16) = 0xA3,
|
|
BranchIntLessEquals(i16) = 0xA4,
|
|
|
|
BranchAlways(i16) = 0xA7, // branch if true
|
|
ReturnInt() = 0xAC, // return integer from function
|
|
|
|
ReturnReference() = 0xB0, // return top-ref from current function
|
|
ReturnVoid() = 0xB1, // return void from function
|
|
GetStatic(u16) = 0xB2, // get static field from class
|
|
PutStatic(u16) = 0xB3, // set static field on class
|
|
GetField(u16) = 0xB4, // get field from class
|
|
PutField(u16) = 0xB5, // set field to a value
|
|
InvokeVirtual(u16) = 0xB6, // invoke function on a class
|
|
InvokeSpecial(u16) = 0xB7, // invoke instance method
|
|
InvokeStatic(u16) = 0xB8, // invoke static function
|
|
InvokeDynamic(u16, u16) = 0xBA, // invoke dynamic function
|
|
NewObject(u16) = 0xBB, // Create a new object from a constant-pool class reference
|
|
NewPrimitiveArray(u8) = 0xBC, // make a primitive array
|
|
NewArray(u16) = 0xBD, // Create a new array from a constant-pool component class reference
|
|
ArrayLength() = 0xBE, // Get length from array reference
|
|
|
|
EnterMonitor() = 0xC2, // enter the synchronization monitor of an object
|
|
ExitMonitor() = 0xC3, // exit the synchronization monitor of an object
|
|
BranchNull(i16) = 0xC6, // branch if Null
|
|
BranchNonNull(i16) = 0xC7, // branch if Null
|
|
|
|
Unknown(u8),
|
|
}
|