63 lines
1.7 KiB
Rust
63 lines
1.7 KiB
Rust
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use core::fmt::{Display, Formatter};
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use std::error::Error as ErrorTrait;
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use crate::classstore;
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use crate::classstore::ClassStore;
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use crate::stackframe::StackFrame;
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#[derive(Debug)]
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pub enum Error {
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ClassStoreError(classstore::Error),
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BadNameError(String),
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}
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impl From<classstore::Error> for Error {
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fn from(value: classstore::Error) -> Self {
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return Error::ClassStoreError(value);
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}
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}
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impl ErrorTrait for Error {}
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impl Display for Error {
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fn fmt(&self, formatter: &mut Formatter<'_>) -> Result<(), std::fmt::Error> {
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writeln!(formatter, "{self}")?;
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if let Some(e) = self.source() {
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writeln!(formatter, "\tCaused by: {e:?}")?;
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}
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Ok(())
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}
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}
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#[derive(Debug)]
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pub struct JVM {
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class_store: ClassStore,
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stack_frames: Vec<StackFrame>,
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}
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impl JVM {
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pub fn new() -> Self {
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return JVM {
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class_store: ClassStore::new(),
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stack_frames: Vec::new(),
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}
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}
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pub fn load_class(&mut self, name: &String) -> Result<String, classstore::Error> {
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return self.class_store.load_class(name);
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}
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pub fn invoke_static(&mut self, class_name: &String, method_name: &String) -> Result<(), Error> {
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let (class_file, class_index) = self.class_store.get_or_load_class(class_name)?;
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let method_index = class_file.find_method_index(method_name)
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.ok_or(Error::BadNameError(format!("Could not find method '{}' in class '{}'", method_name, class_name)))?;
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let new_frame = StackFrame::new(class_file, class_index, method_index.try_into().expect(&format!("Bad method index: {}", method_index)));
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self.stack_frames.push(new_frame);
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return Ok(());
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}
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}
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