62 lines
1.4 KiB
Rust
62 lines
1.4 KiB
Rust
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use crate::classfile::{ JavaClassFile, AttributeData };
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#[derive(Copy, Clone, Debug)]
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pub enum LocalVariable {
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Boolean(bool),
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Byte(u8),
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Char(u16),
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Short(u16),
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Int(u32),
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Float(u32),
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Reference(u32),
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ReturnAddress(u32),
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Double0(u32),
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Double1(u32),
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Long0(u32),
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Long1(u32),
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Empty(),
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}
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#[derive(Debug)]
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pub struct OperandStack {
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stack: Box<[LocalVariable]>,
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depth: u16,
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}
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impl OperandStack {
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fn new(size: u16) -> Self {
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return OperandStack {
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stack: vec![LocalVariable::Empty(); size.into()].into_boxed_slice(),
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depth: 0,
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}
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}
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}
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#[derive(Debug)]
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pub struct StackFrame {
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locals: Box<[LocalVariable]>,
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operand_stack: OperandStack,
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class_id: usize,
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method_index: u16,
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instruction_pointer: u32,
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}
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impl StackFrame {
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pub fn new(classfile: &JavaClassFile, class_id: usize, method_index: u16) -> Self {
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let method_info = &classfile.methods[method_index as usize];
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let code_data = match &method_info.attributes[method_info.code_attribute_index].data {
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AttributeData::Code(data) => data,
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_ => unreachable!(),
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};
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StackFrame {
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locals: vec![LocalVariable::Empty(); code_data.max_locals.into()].into_boxed_slice(),
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operand_stack: OperandStack::new(code_data.max_stack),
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class_id,
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method_index,
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instruction_pointer: 0,
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}
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}
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}
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