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This commit is contained in:
Sander Hautvast 2023-09-30 08:34:16 +02:00
parent d6a40a81a4
commit 4d55892e61
13 changed files with 673 additions and 214 deletions
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79
Cargo.lock generated
View file

@ -2,15 +2,6 @@
# It is not intended for manual editing.
version = 3
[[package]]
name = "aho-corasick"
version = "1.1.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ea5d730647d4fadd988536d06fecce94b7b4f2a7efdae548f1cf4b63205518ab"
dependencies = [
"memchr",
]
[[package]]
name = "anyhow"
version = "1.0.75"
@ -18,44 +9,50 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a4668cab20f66d8d020e1fbc0ebe47217433c1b6c8f2040faf858554e394ace6"
[[package]]
name = "classfile_reader"
name = "byteorder"
version = "1.4.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
[[package]]
name = "cfg-if"
version = "1.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
[[package]]
name = "crc32fast"
version = "1.3.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b540bd8bc810d3885c6ea91e2018302f68baba2129ab3e88f32389ee9370880d"
dependencies = [
"cfg-if",
]
[[package]]
name = "crossbeam-utils"
version = "0.8.16"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5a22b2d63d4d1dc0b7f1b6b2747dd0088008a9be28b6ddf0b1e7d335e3037294"
dependencies = [
"cfg-if",
]
[[package]]
name = "java_rs"
version = "0.1.0"
dependencies = [
"anyhow",
"regex",
"zip",
]
[[package]]
name = "memchr"
version = "2.6.3"
name = "zip"
version = "0.6.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8f232d6ef707e1956a43342693d2a31e72989554d58299d7a88738cc95b0d35c"
[[package]]
name = "regex"
version = "1.9.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "697061221ea1b4a94a624f67d0ae2bfe4e22b8a17b6a192afb11046542cc8c47"
checksum = "760394e246e4c28189f19d488c058bf16f564016aefac5d32bb1f3b51d5e9261"
dependencies = [
"aho-corasick",
"memchr",
"regex-automata",
"regex-syntax",
"byteorder",
"crc32fast",
"crossbeam-utils",
]
[[package]]
name = "regex-automata"
version = "0.3.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c2f401f4955220693b56f8ec66ee9c78abffd8d1c4f23dc41a23839eb88f0795"
dependencies = [
"aho-corasick",
"memchr",
"regex-syntax",
]
[[package]]
name = "regex-syntax"
version = "0.7.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "dbb5fb1acd8a1a18b3dd5be62d25485eb770e05afb408a9627d14d451bae12da"

8
Cargo.toml
View file

@ -1,10 +1,8 @@
[package]
name = "classfile_reader"
name = "java_rs"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
regex = "1.9.5"
anyhow = { version = "1.0", features = [] }
anyhow = { version = "1.0", features = ["default"] }
zip = { version = "0.6", default-features = false }

347
LICENSE Normal file
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@ -0,0 +1,347 @@
The GNU General Public License (GPL)
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Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this when it
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with ABSOLUTELY NO WARRANTY; for details type 'show w'. This is free
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Yoyodyne, Inc., hereby disclaims all copyright interest in the program
'Gnomovision' (which makes passes at compilers) written by James Hacker.
signature of Ty Coon, 1 April 1989
Ty Coon, President of Vice
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License instead of this License.
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BIN
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76
src/class.rs
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@ -1,10 +1,10 @@
use crate::classloader::CpEntry;
use crate::heap::Object;
use anyhow::{anyhow, Error};
use std::collections::HashMap;
use std::fmt;
use std::rc::Rc;
use std::sync::Arc;
use anyhow::{anyhow, Error};
use crate::classloader::CpEntry;
use crate::heap::Object;
use crate::io::read_u16;
@ -29,7 +29,9 @@ impl Class {
}
pub fn get_method(&self, name: &str) -> Result<&Method, Error> {
self.methods.get(name).ok_or(anyhow!("Method {} not found", name))
self.methods
.get(name)
.ok_or(anyhow!("Method {} not found", name))
}
}
unsafe impl Send for Class {}
@ -44,18 +46,29 @@ pub struct Method {
impl fmt::Debug for Method {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "Method {{access_flags: {}, name_index: {}, descriptor_index: {}, attributes: {:?} }}",
self.access_flags, self.name_index, self.descriptor_index, self.attributes)
write!(
f,
"Method {{access_flags: {}, name_index: {}, descriptor_index: {}, attributes: {:?} }}",
self.access_flags, self.name_index, self.descriptor_index, self.attributes
)
}
}
impl Method {
pub fn new(constant_pool: Rc<HashMap<u16, CpEntry>>,
pub fn new(
constant_pool: Rc<HashMap<u16, CpEntry>>,
access_flags: u16,
name_index: u16,
descriptor_index: u16,
attributes: HashMap<String, AttributeType>, ) -> Self {
Method { constant_pool, access_flags, name_index, descriptor_index, attributes }
attributes: HashMap<String, AttributeType>,
) -> Self {
Method {
constant_pool,
access_flags,
name_index,
descriptor_index,
attributes,
}
}
pub fn name(&self) -> String {
@ -67,7 +80,6 @@ impl Method {
full_name.push_str(s);
}
full_name
}
}
@ -82,18 +94,29 @@ pub struct Field {
impl fmt::Debug for Field {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "Field {{access_flags: {}, name_index: {}, descriptor_index: {}, attributes: {:?} }}",
self.access_flags, self.name_index, self.descriptor_index, self.attributes)
write!(
f,
"Field {{access_flags: {}, name_index: {}, descriptor_index: {}, attributes: {:?} }}",
self.access_flags, self.name_index, self.descriptor_index, self.attributes
)
}
}
impl Field {
pub fn new(constant_pool: Rc<HashMap<u16, CpEntry>>,
pub fn new(
constant_pool: Rc<HashMap<u16, CpEntry>>,
access_flags: u16,
name_index: u16,
descriptor_index: u16,
attributes: HashMap<String, AttributeType>, ) -> Self {
Field { constant_pool, access_flags, name_index, descriptor_index, attributes }
attributes: HashMap<String, AttributeType>,
) -> Self {
Field {
constant_pool,
access_flags,
name_index,
descriptor_index,
attributes,
}
}
pub fn name(&self) -> String {
@ -128,17 +151,19 @@ const MODIFIERS: [(u16, &str); 12] = [
(0x0100, "native "),
(0x0200, "interface "),
(0x0400, "interface "),
(0x0800, "strict ")];
(0x0800, "strict "),
];
pub fn get_modifier(modifier: u16) -> String {
let mut output = String::new();
for m in MODIFIERS {
if modifier & m.0 == m.0 { output.push_str(m.1) }
if modifier & m.0 == m.0 {
output.push_str(m.1)
}
}
output
}
#[derive(Debug)]
pub enum AttributeType {
ConstantValue(u16),
@ -202,11 +227,20 @@ pub struct MethodCode {
}
impl MethodCode {
pub(crate) fn new(_max_stack: u16, _max_locals: u16,
pub(crate) fn new(
_max_stack: u16,
_max_locals: u16,
code: Vec<u8>,
_exception_table: Vec<Exception>,
_code_attributes: HashMap<String, AttributeType>) -> Self {
Self { _max_stack, _max_locals, opcodes: code, _exception_table, _code_attributes }
_code_attributes: HashMap<String, AttributeType>,
) -> Self {
Self {
_max_stack,
_max_locals,
opcodes: code,
_exception_table,
_code_attributes,
}
}
}

58
src/classloader.rs
View file

@ -1,8 +1,8 @@
use crate::class::{AttributeType, Class, Exception, Field, Method, MethodCode};
use crate::io::{read_f32, read_f64, read_i32, read_i64, read_u16, read_u32};
use anyhow::Error;
use std::collections::HashMap;
use std::rc::Rc;
use anyhow::Error;
use crate::io::{read_f32, read_f64, read_i32, read_i64, read_u16, read_u32};
use crate::class::{AttributeType, Class, MethodCode, Exception, Field, Method};
pub fn load_class(bytecode: Vec<u8>) -> Result<Class, Error> {
check_magic(&bytecode);
@ -10,11 +10,15 @@ pub fn load_class(bytecode: Vec<u8>) -> Result<Class, Error> {
let constant_pool_count = read_u16(&bytecode, 8);
// println!("cp count: {}", constant_pool_count);
let mut index = 10;
let mut constant_pool: HashMap<u16, CpEntry> = HashMap::with_capacity(constant_pool_count as usize);
let mut constant_pool: HashMap<u16, CpEntry> =
HashMap::with_capacity(constant_pool_count as usize);
let mut cp_index = 1;
while cp_index < constant_pool_count {
// println!("cp#{}", cp_index);
constant_pool.insert(cp_index, read_constant_pool_entry(&mut cp_index, &mut index, &bytecode));
constant_pool.insert(
cp_index,
read_constant_pool_entry(&mut cp_index, &mut index, &bytecode),
);
cp_index += 1;
}
@ -154,12 +158,15 @@ fn read_constant_pool_entry(cp_index: &mut u16, index: &mut usize, bytecode: &[u
// 18 InvokeDynamic,
// 19 Module,
// 20 Package,
_ => panic!("cp entry type not recognized")
_ => panic!("cp entry type not recognized"),
}
}
fn read_field(constant_pool: Rc<HashMap<u16, CpEntry>>, index: &mut usize, bytecode: &[u8]) -> Field {
fn read_field(
constant_pool: Rc<HashMap<u16, CpEntry>>,
index: &mut usize,
bytecode: &[u8],
) -> Field {
let access_flags = read_u16(bytecode, *index);
let name_index = read_u16(bytecode, *index + 2);
let descriptor_index = read_u16(bytecode, *index + 4);
@ -182,7 +189,11 @@ fn read_field(constant_pool: Rc<HashMap<u16, CpEntry>>, index: &mut usize, bytec
)
}
fn read_method(constant_pool: Rc<HashMap<u16, CpEntry>>, index: &mut usize, bytecode: &[u8]) -> Method {
fn read_method(
constant_pool: Rc<HashMap<u16, CpEntry>>,
index: &mut usize,
bytecode: &[u8],
) -> Method {
let access_flags = read_u16(bytecode, *index);
let name_index = read_u16(bytecode, *index + 2);
let descriptor_index = read_u16(bytecode, *index + 4);
@ -205,7 +216,11 @@ fn read_method(constant_pool: Rc<HashMap<u16, CpEntry>>, index: &mut usize, byte
)
}
fn read_attribute(constant_pool: Rc<HashMap<u16, CpEntry>>, bytecode: &[u8], index: &mut usize) -> Option<(String, AttributeType)> {
fn read_attribute(
constant_pool: Rc<HashMap<u16, CpEntry>>,
bytecode: &[u8],
index: &mut usize,
) -> Option<(String, AttributeType)> {
let attribute_name_index = read_u16(bytecode, *index);
*index += 2;
let attribute_length = read_u32(bytecode, *index) as usize;
@ -213,13 +228,15 @@ fn read_attribute(constant_pool: Rc<HashMap<u16, CpEntry>>, bytecode: &[u8], ind
let info: Vec<u8> = Vec::from(&bytecode[*index..*index + attribute_length]);
*index += attribute_length;
if let CpEntry::Utf8(s) = &constant_pool.get(&attribute_name_index).unwrap() {
// println!("Att [{}]", s);
return match s.as_str() {
"ConstantValue" => {
assert_eq!(info.len(), 2);
Some(("ConstantValue".into(), AttributeType::ConstantValue(read_u16(&info, 0))))
Some((
"ConstantValue".into(),
AttributeType::ConstantValue(read_u16(&info, 0)),
))
}
"Code" => {
let max_stack = read_u16(&info, 0);
@ -238,15 +255,25 @@ fn read_attribute(constant_pool: Rc<HashMap<u16, CpEntry>>, bytecode: &[u8], ind
code_index += 2;
let mut code_attributes = HashMap::new();
for _ in 0..attribute_count {
if let Some(att) = read_attribute(constant_pool.clone(), &info, &mut code_index) {
if let Some(att) = read_attribute(constant_pool.clone(), &info, &mut code_index)
{
code_attributes.insert(att.0, att.1);
}
}
Some(("Code".into(), AttributeType::Code(MethodCode::new(max_stack, max_locals, code, exception_table, code_attributes))))
Some((
"Code".into(),
AttributeType::Code(MethodCode::new(
max_stack,
max_locals,
code,
exception_table,
code_attributes,
)),
))
}
"SourceFile" => Some(("SourceFile".into(), AttributeType::SourceFile)),
"LineNumberTable" => Some(("SourceFile".into(), AttributeType::LineNumberTable)),
_ => None
_ => None,
};
}
None
@ -266,4 +293,3 @@ pub enum CpEntry {
InterfaceMethodref(u16, u16),
NameAndType(u16, u16),
}

11
src/heap.rs
View file

@ -1,6 +1,6 @@
use crate::class::{Class, Value};
use std::collections::HashMap;
use std::sync::Arc;
use crate::class::{Class, Value};
#[derive(Debug)]
pub struct Object {
@ -15,10 +15,7 @@ unsafe impl Sync for Object {}
impl Object {
pub fn new(_class: Arc<Class>, data: HashMap<u16, Arc<Value>>) -> Self {
Self {
_class,
data,
}
Self { _class, data }
}
}
@ -28,9 +25,7 @@ pub(crate) struct Heap {
impl Heap {
pub fn new() -> Self {
Self {
objects: vec![]
}
Self { objects: vec![] }
}
pub(crate) fn new_object(&mut self, object: Arc<Object>) {

44
src/io.rs
View file

@ -1,33 +1,61 @@
use anyhow::{anyhow, Error};
use std::fs::{self, File};
use std::io::Read;
use anyhow::{anyhow, Error};
pub(crate) fn read_u8(data: &[u8], pos: usize) -> u8 {
u8::from_be_bytes(data[pos..pos + 1].try_into().expect("slice with incorrect length"))
u8::from_be_bytes(
data[pos..pos + 1]
.try_into()
.expect("slice with incorrect length"),
)
}
pub(crate) fn read_u16(data: &[u8], pos: usize) -> u16 {
u16::from_be_bytes(data[pos..pos + 2].try_into().expect("slice with incorrect length"))
u16::from_be_bytes(
data[pos..pos + 2]
.try_into()
.expect("slice with incorrect length"),
)
}
pub(crate) fn read_i32(data: &[u8], pos: usize) -> i32 {
i32::from_be_bytes(data[pos..pos + 4].try_into().expect("slice with incorrect length"))
i32::from_be_bytes(
data[pos..pos + 4]
.try_into()
.expect("slice with incorrect length"),
)
}
pub(crate) fn read_u32(data: &[u8], pos: usize) -> u32 {
u32::from_be_bytes(data[pos..pos + 4].try_into().expect("slice with incorrect length"))
u32::from_be_bytes(
data[pos..pos + 4]
.try_into()
.expect("slice with incorrect length"),
)
}
pub(crate) fn read_f32(data: &[u8], pos: usize) -> f32 {
f32::from_be_bytes(data[pos..pos + 4].try_into().expect("slice with incorrect length"))
f32::from_be_bytes(
data[pos..pos + 4]
.try_into()
.expect("slice with incorrect length"),
)
}
pub(crate) fn read_i64(data: &[u8], pos: usize) -> i64 {
i64::from_be_bytes(data[pos..pos + 8].try_into().expect("slice with incorrect length"))
i64::from_be_bytes(
data[pos..pos + 8]
.try_into()
.expect("slice with incorrect length"),
)
}
pub(crate) fn read_f64(data: &[u8], pos: usize) -> f64 {
f64::from_be_bytes(data[pos..pos + 8].try_into().expect("slice with incorrect length"))
f64::from_be_bytes(
data[pos..pos + 8]
.try_into()
.expect("slice with incorrect length"),
)
}
pub fn find_class(classpath: &Vec<String>, class_name: &str) -> Result<String, Error> {

5
src/lib.rs
View file

@ -1,7 +1,6 @@
pub mod class;
pub mod classloader;
mod heap;
pub mod io;
pub mod opcodes;
pub mod vm;
mod heap;
pub mod classloader;

7
src/main.rs
View file

@ -1,10 +1,9 @@
use java_rs::vm::Vm;
use std::io::Error;
use classfile_reader::vm::Vm;
fn main() -> Result<(), Error> {
let mut vm = Vm::new("tests");
vm.execute("Main","public static main([Ljava/lang/String;)V", None).unwrap();
vm.execute("Main", "public static main([Ljava/lang/String;)V", None)
.unwrap();
Ok(())
}

5
src/opcodes.rs
View file

@ -51,7 +51,7 @@ pub const ALOAD_0:&u8 = &42;// (0x2a)
// pub const bastore:u8 = 84; // (0x54)
//
// pub const castore:u8 = 85; // (0x55)
// pub const dup:u8 = 89; // (0x59) duplicate the top operand stack value
pub const DUP: &u8 = &89; // (0x59) duplicate the top operand stack value
// pub const dup_x1: u8 = 90; // (0x5a) Duplicate the top operand stack value and insert two values down
// pub const dup_x2: u8 = 91; // (0x5b) Duplicate the top operand stack value and insert two or three values down
// pub const dup2: u8 = 92; // (0x5c) Duplicate the top one or two operand stack values
@ -86,11 +86,12 @@ pub const FRETURN: &u8 = &174; // (0xae) Return float from method
pub const DRETURN: &u8 = &175; // (0xaf) Return double from method
// pub const areturn: u8 = 176; //(0xb0) return reference
// pub const return_v: u8 = 177; // (0xb1) Return void from method (actually 'return' but that's a keyword)
// pub const getstatic: u8 = 178; // (0xb2) Get static field from class
pub const GETFIELD: &u8 = &180; // (0xb4) Fetch field from object3
pub const NEW: &u8 = &187; // (0xbb) Create new object
// pub const invokevirtual: u8 = 182; // (0xb6) Invoke instance method; dispatch based on class
//
// pub const getstatic: u8 = 178; // (0xb2) Get static field from class
pub const INVOKESPECIAL: &u8 = &183; // (0xb7) // nvoke instance method; direct invocation of instance initialization methods and methods of the current class and its supertypes
// pub const anewarray: u8 = 189; // (0xbd)
//
// pub const arraylength: u8 = 190; // (0xbe)

90
src/vm.rs
View file

@ -4,10 +4,10 @@ use std::sync::Arc;
use anyhow::{anyhow, Error};
use crate::class::{AttributeType, Class, Value};
use crate::classloader::{CpEntry, load_class};
use crate::classloader::{load_class, CpEntry};
use crate::heap::{Heap, Object};
use crate::io::*;
use crate::opcodes;
use crate::opcodes::*;
struct StackFrame {
data: Vec<Arc<Value>>,
@ -15,9 +15,7 @@ struct StackFrame {
impl StackFrame {
fn new() -> Self {
Self {
data: vec![]
}
Self { data: vec![] }
}
fn push(&mut self, val: Arc<Value>) {
@ -57,7 +55,6 @@ impl Vm {
Ok(entry.clone())
}
pub fn new_instance(&self, class: Arc<Class>) -> Object {
let mut data = HashMap::new();
for f in &class.fields {
@ -70,14 +67,19 @@ impl Vm {
"F" => Value::F32(0.0),
"D" => Value::F64(0.0),
"L" => Value::Null,
_ => Value::Void
_ => Value::Void,
};
data.insert(f.name_index, Arc::new(value));
}
Object::new(class.clone(), data)
}
pub fn execute(&mut self, class_name: &str, method_name: &str, instance: Option<Arc<Object>>) -> Result<Arc<Value>, Error> {
pub fn execute(
&mut self,
class_name: &str,
method_name: &str,
instance: Option<Arc<Object>>,
) -> Result<Arc<Value>, Error> {
let class = self.get_class(class_name)?;
let method = class.get_method(method_name)?;
if let AttributeType::Code(code) = method.attributes.get("Code").unwrap() {
@ -86,14 +88,14 @@ impl Vm {
while pc < code.opcodes.len() {
let opcode = &code.opcodes[pc];
pc += 1;
println!("{}", opcode);
println!("opcode {}", opcode);
match opcode {
opcodes::BIPUSH => {
BIPUSH => {
let c = code.opcodes[pc] as i32;
stack.push(Arc::new(Value::I32(c)));
pc += 1;
}
opcodes::LDC => {
LDC => {
let cp_index = read_u8(&code.opcodes, pc) as u16;
match method.constant_pool.get(&cp_index).unwrap() {
CpEntry::Integer(i) => {
@ -106,7 +108,7 @@ impl Vm {
}
pc += 1;
}
opcodes::LDC_W => {
LDC_W => {
let cp_index = read_u16(&code.opcodes, pc);
match method.constant_pool.get(&cp_index).unwrap() {
CpEntry::Integer(i) => {
@ -115,11 +117,13 @@ impl Vm {
CpEntry::Float(f) => {
stack.push(Arc::new(Value::F32(*f)));
}
_ => { panic!("unexpected") }
_ => {
panic!("unexpected")
}
}
pc += 2;
}
opcodes::LDC2_W => {
LDC2_W => {
let cp_index = read_u16(&code.opcodes, pc);
match method.constant_pool.get(&cp_index).unwrap() {
CpEntry::Double(d) => {
@ -128,33 +132,46 @@ impl Vm {
CpEntry::Long(l) => {
stack.push(Arc::new(Value::I64(*l)));
}
_ => { panic!("unexpected") }
_ => {
panic!("unexpected")
}
}
pc += 2;
}
opcodes::ALOAD_0 => {
match instance.clone() {
ALOAD_0 => match instance.clone() {
Some(r) => {
stack.push(Arc::new(Value::Ref(r)));
}
None => { panic!("static context") }
None => {
panic!("static context")
}
},
DUP => {
println!("DUP");
let value = stack.pop().expect("Stack empty");
stack.push(value.clone());
stack.push(value);
}
opcodes::IRETURN => {
IRETURN => {
return stack.pop();
}
opcodes::DRETURN => {
DRETURN => {
return stack.pop();
}
opcodes::FRETURN => {
FRETURN => {
return stack.pop();
}
opcodes::GETFIELD => {
GETFIELD => {
let cp_index = read_u16(&code.opcodes, pc);
if let CpEntry::Fieldref(_class_index, name_and_type_index) = method.constant_pool.get(&cp_index).unwrap() {
if let Value::Ref(inst) = &*stack.pop()? { //TODO smell?
if let CpEntry::NameAndType(name, _) = method.constant_pool.get(name_and_type_index).unwrap() {
if let CpEntry::Fieldref(_class_index, name_and_type_index) =
method.constant_pool.get(&cp_index).unwrap()
{
if let Value::Ref(inst) = &*stack.pop()? {
//TODO smell?
if let CpEntry::NameAndType(name, _) =
method.constant_pool.get(name_and_type_index).unwrap()
{
let value = inst.data.get(name).unwrap();
// println!("{:?}", value);
stack.push(value.clone());
@ -163,19 +180,34 @@ impl Vm {
}
pc += 2;
}
opcodes::NEW => {
INVOKESPECIAL => {
let ref_index = read_u16(&code.opcodes, pc);
if let CpEntry::MethodRef(_class_index, name_and_type_index) =
method.constant_pool.get(&ref_index).unwrap()
{}
pc += 2;
}
NEW => {
println!("new");
let cp_index = read_u16(&code.opcodes, pc);
if let CpEntry::ClassRef(class_name_index) = method.constant_pool.get(&cp_index).unwrap() {
if let CpEntry::Utf8(_) = method.constant_pool.get(class_name_index).unwrap() {
if let CpEntry::ClassRef(class_name_index) =
method.constant_pool.get(&cp_index).unwrap()
{
if let CpEntry::Utf8(_) =
method.constant_pool.get(class_name_index).unwrap()
{
let class = self.get_class(class_name)?;
let object = Arc::new(self.new_instance(class));
stack.push(Arc::new(Value::Ref(object.clone())));
self.heap.new_object(object);
}
}
pc += 2;
}
//TODO implement all opcodes
_ => { panic!("opcode not implemented") }
_ => {
panic!("opcode not implemented")
}
}
}
}

13
tests/class_tests.rs
View file

@ -1,9 +1,9 @@
mod test {
use std::rc::Rc;
use std::sync::Arc;
use classfile_reader::{classloader::load_class, io};
use classfile_reader::class::Value;
use classfile_reader::vm::Vm;
use classfile_reader::{classloader::load_class, io};
use std::rc::Rc;
use std::sync::Arc;
#[test]
fn get_constant_int() {
@ -47,11 +47,14 @@ mod test {
fn get_float() {
// assert_eq!((55, 0), class.get_version());
let mut vm = Vm::new("/Users/FJ19WK/RustroverProjects/classfile_reader/tests");
let mut vm = Vm::new("/Users/FJ19WK/RustroverProjects/java_rs/tests");
let c = vm.get_class("Float").unwrap();
let object = Arc::new(vm.new_instance(c));
if let Value::F32(v) = *vm.execute("Float","public getF2()F", Some(object)).unwrap() {
if let Value::F32(v) = *vm
.execute("Float", "public getF2()F", Some(object))
.unwrap()
{
assert_eq!(v, 0.0);
} else {
panic!("fail");