Struct rust_jvm::vm::frame::Frame
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pub struct Frame<'a> {
current_class: &'a Class,
code: &'a [u8],
pc: u16,
local_variables: Vec<Option<Value>>,
operand_stack: Vec<Value>,
}A frame is used to store data and partial results, as well as to perform dynamic linking, return values for methods, and dispatch exceptions.
Fields
current_class | A reference to the class containing the currently executing method. |
code | The bytecode currently executing in this frame. |
pc | The current program counter. |
local_variables | The local variables of the current method.
Values that occupy two indices ( |
operand_stack | The operand stack manipulated by the instructions of the current method. |
Methods
impl<'a> Frame<'a>
fn new(current_class: &'a Class, code: &'a [u8], local_variables: Vec<Option<Value>>) -> Self
fn read_next_byte(&mut self) -> u8
Read a byte (u8) value and advance the program counter.
fn read_next_short(&mut self) -> u16
Read a short (u16) value and advance the program counter by 2.
fn pop_multi(&mut self, count: usize) -> Vec<Value>
Remove count items from the operand stack.
fn run(self, class_loader: &mut ClassLoader) -> Option<Value>
Execute the method associated with this stack frame in the context of the currrent class
loader, and return a result if there is one. This method may create new stack frames as a
result of evaluating invoke* instructions.