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feat(compiler): introduce code section (#85)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| //! Table for the code section. | ||
|
|
||
| use opcodes::ShangHai as OpCode; | ||
| use std::collections::HashMap; | ||
|
|
||
| /// Code in code section. | ||
| #[derive(Clone, Copy, Debug, PartialOrd, Ord, PartialEq, Eq, Hash)] | ||
| pub enum Func { | ||
| /// Run select. | ||
| Select, | ||
| } | ||
|
|
||
| impl Func { | ||
| /// Get the bytecode of the function. | ||
| pub fn bytecode(&self) -> Vec<u8> { | ||
| match self { | ||
| Self::Select => [ | ||
| OpCode::JUMPDEST, | ||
| OpCode::POP, | ||
| OpCode::PUSH1, | ||
| OpCode::Data(0x06), | ||
| OpCode::ADD, | ||
| OpCode::JUMP, | ||
| ], | ||
| } | ||
| .into_iter() | ||
| .map(|op| op.into()) | ||
| .collect() | ||
| } | ||
| } | ||
|
|
||
| /// Code section for EVM. | ||
| #[derive(Default, Debug)] | ||
| pub struct Code { | ||
| offset: usize, | ||
| /// Function table. | ||
| funcs: HashMap<Func, usize>, | ||
| } | ||
|
|
||
| impl Code { | ||
| /// Create a new code section. | ||
| pub fn new() -> Self { | ||
| Self { | ||
| offset: 0, | ||
| funcs: HashMap::new(), | ||
| } | ||
| } | ||
|
|
||
| /// Get the functions in the code section. | ||
| pub fn funcs(&self) -> Vec<Func> { | ||
| self.funcs.keys().cloned().collect() | ||
| } | ||
|
|
||
| /// Shift the code section. | ||
| pub fn shift(&mut self, offset: u16) { | ||
| tracing::debug!("shift code section by 0x{:x} bytes.", offset); | ||
| let offset = offset as usize; | ||
| self.offset += offset; | ||
| self.funcs.values_mut().for_each(|pc| *pc += offset); | ||
| } | ||
|
|
||
| /// Add a function to the code section. | ||
| pub fn try_add_func(&mut self, func: Func) { | ||
| if self.funcs.contains_key(&func) { | ||
| return; | ||
| } | ||
|
|
||
| let bytecode = func.bytecode(); | ||
| let len = bytecode.len(); | ||
| self.funcs.insert(func, self.offset); | ||
| self.offset += len; | ||
| } | ||
|
|
||
| /// Get the current offset of the code section. | ||
| pub fn offset(&self) -> usize { | ||
| self.offset | ||
| } | ||
|
|
||
| /// Get the offset of a function. | ||
| pub fn offset_of(&self, func: &Func) -> Option<u16> { | ||
| self.funcs.get(func).and_then(|i| (*i).try_into().ok()) | ||
| } | ||
|
|
||
| /// Get the bytecode of the code section. | ||
| pub fn finish(&self) -> Vec<u8> { | ||
| let mut code = Vec::new(); | ||
| for func in self.funcs.keys() { | ||
| code.extend(func.bytecode()); | ||
| } | ||
| code | ||
| } | ||
| } |
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