Implemented Exception Throwing

src/bytecode.rs

@@ -102,6 +102,7 @@ impl Bytecode {
             0x6D => (Instruction::DivideLong(), 1),
             0x6E => (Instruction::DivideFloat(), 1),
 
+            0x70 => (Instruction::ModuloInt(), 1),
             0x74 => (Instruction::NegateInt(), 1),
             0x75 => (Instruction::NegateLong(), 1),
             0x78 => (Instruction::ArithmeticShiftIntLeft(), 1),
@@ -386,6 +387,7 @@ pub enum Instruction {
     DivideLong()                            = 0x6D, // long division
     DivideFloat()                           = 0x6E, // float division
 
+    ModuloInt()                             = 0x70, // modulo
     NegateInt()                             = 0x74, // arithmetic negation
     NegateLong()                            = 0x75, // arithmetic negation
     ArithmeticShiftIntLeft()                = 0x78, // shift int left, preserve sign

src/classfile.rs

@@ -375,6 +375,15 @@ impl JavaClassFile {
 
         return Ok((class_name, method_name, method_descriptor));
     }
+
+    pub fn gather_methodref_compatible(&self, methodref_index: u16) -> Result<(&String, &String, &String), Error> {
+        return match self.pool_entry(methodref_index) {
+            Ok(ConstantPoolInfo::MethodRef(_)) => self.gather_methodref(methodref_index),
+            Ok(ConstantPoolInfo::InterfaceMethodRef(_)) => self.gather_interfacemethodref(methodref_index),
+            Err(i) => Err(i),
+            _ => unreachable!()
+        }
+    }
     
     pub fn sourcefile(&self) -> Result<Option<&String>, Error> {
         match (&self.attributes).into_iter()
@@ -391,6 +400,23 @@ impl JavaClassFile {
                 },
         }
     }
+
+    pub fn is_method_bytecode_protected(&self, method: &MethodInfo, instruction_pointer: u16, exception: crate::heap_area::ObjectReference) -> bool {
+        let code_attribute = method.get_code_attribute().unwrap();
+
+        for exception_entry in &code_attribute.exception_table {
+            if exception_entry.start_pc <= instruction_pointer && exception_entry.end_pc > instruction_pointer {
+                if exception_entry.catch_type == 0 {
+                    return true;
+                } else {
+                    // Check catch-type
+                    todo!()
+                }
+            }
+        }
+
+        false
+    }
 }
 
 #[derive(Debug)] 
@@ -500,10 +526,10 @@ impl LineNumberTableAttributeData {
 
 #[derive(Debug)] 
 pub struct ExceptionTableEntry {
-    start_pc: u16,
-    end_pc: u16,
-    handler_pc: u16,
-    catch_type: u16,
+    pub start_pc: u16,
+    pub end_pc: u16,
+    pub handler_pc: u16,
+    pub catch_type: u16,
 }
 
 impl ExceptionTableEntry {
@@ -517,6 +543,10 @@ impl ExceptionTableEntry {
             }
         )
     }
+
+    fn catches_in(&self, instruction_pointer: u16) -> bool {
+        return self.start_pc <= instruction_pointer && self.end_pc > instruction_pointer
+    }
 }
 
 #[derive(Debug)] 
@@ -1128,6 +1158,20 @@ impl MethodInfo {
             None 
         };
     }
+
+    pub fn is_native(&self) -> bool {
+        return self.access_flags & MethodAccessFlag::Native;
+    }
+
+    pub fn get_protected_handler_pc(&self, instruction_pointer: u16) -> Option<u16> {
+        for exception_entry in &self.get_code_attribute()?.exception_table {
+            if exception_entry.catches_in(instruction_pointer) {
+                return Some(exception_entry.handler_pc)
+            }
+        }
+
+        None
+    }
 }
 
 

src/jvm.rs

@@ -1,3 +1,4 @@
+use crate::classfile::ExceptionTableEntry;
 use core::fmt::{Display, Formatter};
 
 use std::collections::VecDeque;
@@ -9,7 +10,7 @@ use crate::classfile;
 use crate::classfile::{ JavaClassFile, FieldInfo, MethodInfo, MethodDescriptor, AbstractTypeDescription, AbstractTypeKind, AttributeInfo, AttributeData, CodeAttributeData, ConstantValueAttributeData };
 use crate::classstore;
 use crate::classstore::ClassStore;
-use crate::constantpool::{ ConstantPoolInfo, ConstantClassInfo, ConstantUtf8Info, ConstantMethodRefInfo, ConstantNameAndTypeInfo};
+use crate::constantpool::{ ConstantClassInfo, ConstantInterfaceMethodRefInfo, ConstantMethodRefInfo, ConstantNameAndTypeInfo, ConstantPoolInfo, ConstantUtf8Info};
 use crate::heap_area::{ HeapArea, FieldValue, ObjectReference, CompartmentEntry };
 use crate::iterators::{ ClassMethodIterator, ClassFieldIterator };
 use crate::native_methods;
@@ -259,7 +260,12 @@ impl JVM {
                     ConstantPoolInfo::Class(ConstantClassInfo { name_index: 18 }),
                     ConstantPoolInfo::Utf8(ConstantUtf8Info { utf8: "java/lang/System".to_string() }),
                     ConstantPoolInfo::NameAndType(ConstantNameAndTypeInfo { name_index: 20, descriptor_index: 13 }),
-                    ConstantPoolInfo::Utf8(ConstantUtf8Info { utf8: "initPhase1".to_string() }),
+                    ConstantPoolInfo::Utf8(ConstantUtf8Info { utf8: "initPhase1".to_string() }), // 20
+                    ConstantPoolInfo::InterfaceMethodRef(ConstantInterfaceMethodRefInfo { class_index: 22, name_and_type_index: 24}),
+                    ConstantPoolInfo::Class(ConstantClassInfo { name_index: 23 }),
+                    ConstantPoolInfo::Utf8(ConstantUtf8Info { utf8: "java/lang/Throwable".to_string() }),
+                    ConstantPoolInfo::NameAndType(ConstantNameAndTypeInfo { name_index: 25, descriptor_index: 13 }),
+                    ConstantPoolInfo::Utf8(ConstantUtf8Info { utf8: "printStackTrace".to_string() }), // 25
                 ]
             ),
             access_flags: ClassAccessFlagMask { mask: ClassAccessFlag::Super.discriminant() },
@@ -309,9 +315,24 @@ impl JVM {
                                             0xB8_u8.to_be(), // invokestatic
                                             0x04_u16.to_be_bytes()[0], // index 4 into the constant
                                             0x04_u16.to_be_bytes()[1], // pool                      
+
+                                            0xB1_u8.to_be(), // returnvoid
+                                            // index 14
+
+                                            0xB9_u8.to_be(), // invokeinterface
+                                            21_u16.to_be_bytes()[0], // index 21 constant
+                                            21_u16.to_be_bytes()[1], // index 21 constant
+                                            0x00_u8.to_be(), // constant 0
                                         ]),
                                     },
-                                    exception_table: Box::new([]),
+                                    exception_table: Box::new([
+                                            ExceptionTableEntry {
+                                                start_pc: 0,
+                                                end_pc: u16::MAX,
+                                                handler_pc: 14,
+                                                catch_type: 0, // Catchall
+                                            }
+                                    ]),
                                     attributes: Box::new([]),
                                 }
                             )
@@ -460,6 +481,43 @@ impl JVM {
                 JVMCallbackOperation::MakeArrayClass(component_class_ref, component_descriptor) => {
                     self.make_array_class(component_class_ref, component_descriptor);
                 }
+
+                JVMCallbackOperation::ThrowException(exception) => {
+                    let mut is_handler_found = false;
+                    while ! is_handler_found {
+                        is_handler_found = {
+                            let frame     = {
+                                let frame_index = self.stack_frames.len() - 1;
+                                &mut self.stack_frames[frame_index]
+                            };
+                            let class     =  self.class_store.class_file_from_idx(frame.class_index).unwrap();
+                            let method    = &class.methods[frame.method_index as usize];
+                            if method.is_native() {
+                                false
+                            } else {
+                                class.is_method_bytecode_protected(method, frame.instruction_pointer as u16, exception)
+                            }
+                        };
+
+                        if ! is_handler_found {
+                            self.stack_frames.pop();
+                        }
+                    }
+
+                    if is_handler_found {
+                        let frame = {
+                            let frame_index = self.stack_frames.len() - 1;
+                            &mut self.stack_frames[frame_index]
+                        };
+                        let class  =  self.class_store.class_file_from_idx(frame.class_index).unwrap();
+                        let method = &class.methods[frame.method_index as usize];
+                        frame.operand_stack.clear();
+                        wrap_stackframe_error(class, method, frame.operand_stack.push(StackValue::Reference(exception)))?;
+                        frame.instruction_pointer = method.get_protected_handler_pc(frame.instruction_pointer as u16).unwrap() as u32;
+                    } else {
+                        unreachable!()
+                    }
+                }
             }
         }
 
@@ -1345,7 +1403,7 @@ impl JVM {
                 },
 
                 Instruction::InvokeStatic(methodref_index) => {
-                    let (supplied_class_name, supplied_method_name, supplied_descriptor_string) = class.gather_methodref(methodref_index)?;
+                    let (supplied_class_name, supplied_method_name, supplied_descriptor_string) = class.gather_methodref_compatible(methodref_index)?;
 
                     if ! self.class_store.have_class(supplied_class_name) {
                         // rewind the bytecode offset, I'll need to execute this instruction again
@@ -1784,6 +1842,15 @@ impl JVM {
                     wrap_stackframe_error(class, method, frame.operand_stack.push_long(result))?;
                 }
 
+                Instruction::ModuloInt() => {
+                    let int_1 = wrap_stackframe_error(class, method, frame.operand_stack.pop_int(0))?;
+                    let int_2 = wrap_stackframe_error(class, method, frame.operand_stack.pop_int(0))?;
+
+                    let modulo = int_2.wrapping_rem(int_1);
+
+                    wrap_stackframe_error(class, method, frame.operand_stack.push(StackValue::Int(modulo)))?;
+                }
+
                 Instruction::NegateInt() => {
                     let int = wrap_stackframe_error(class, method, frame.operand_stack.pop_int(0))?;
                     let negated = -int;
@@ -1962,6 +2029,7 @@ impl JVM {
                                 match expected_field_descriptor.as_str() {
                                     "Z" => FieldValue::Boolean(i != 0),
                                     "B" => FieldValue::Byte(i as i8),
+                                    "C" => FieldValue::Char(i as u16),
                                     _ => FieldValue::Int(i)
                                 }
                             }
@@ -2068,7 +2136,7 @@ impl JVM {
                         _ => return Err(Error::OpcodeError(format!("Found opcode '{:?}' on method returning '{:?}'", instruction, method.descriptor.return_type)))
                     }
 
-                    let int = wrap_stackframe_error(class, method, frame.operand_stack.pop_int(0))?;
+                    let int = wrap_stackframe_error(class, method, frame.operand_stack.pop_int_compatible(0))?;
 
                     return Ok(JVMCallbackOperation::ReturnFrame(FieldValue::Int(int)));
                 }
@@ -2281,7 +2349,10 @@ impl JVM {
                 Instruction::ThrowException() => {
                     let exception = wrap_stackframe_error(class, method, frame.operand_stack.pop_reference(0))?;
                     if exception == ObjectReference::NULL {
-
+                        // TODO: Throw NullPointerException
+                    } else {
+                        // TODO: Check throwable instance
+                        return Ok(JVMCallbackOperation::ThrowException(exception));
                     }
                 }
 
@@ -2312,6 +2383,7 @@ pub enum JVMCallbackOperation {
     LoadClass(String),
     InitClass(String),
     MakeArrayClass(ObjectReference, AbstractTypeDescription),
+    ThrowException(ObjectReference),
 }
 
 fn load_local_reference(class: &JavaClassFile, method: &MethodInfo, frame: &mut StackFrame, index: usize) -> Result<(), Error> {
@@ -2367,8 +2439,8 @@ fn fill_arguments(class: &JavaClassFile, method: &MethodInfo, arguments: &mut Ve
                             wrap_stackframe_error(
                                 class, 
                                 method, 
-                                stack.pop_char(0)
-                            )? as i32
+                                stack.pop_int_compatible(0)
+                            )?
                         )
                     )
                 },

src/native_methods.rs

@@ -461,6 +461,14 @@ impl JavaLangThrowable {
     }
 }
 
+struct JdkInternalMiscCDS {}
+
+impl JdkInternalMiscCDS {
+    fn get_cds_config_status(_jvm: &mut JVM) -> Result<JVMCallbackOperation, Error> {
+        return Ok(JVMCallbackOperation::ReturnFrame(FieldValue::Int(0)));
+    }
+}
+
 struct JdkInternalMiscUnsafe {}
 
 impl JdkInternalMiscUnsafe {
@@ -2949,6 +2957,185 @@ pub fn function_for(class_name: &str, m: &crate::classfile::MethodInfo) -> Resul
             },
             JavaLangThrowable::fill_in_stacktrace
         ),
+
+        (
+            "java/lang/invoke/MethodHandle",
+            "invokeExact",
+            MethodDescriptor {
+                argument_types: Box::new([
+                    AbstractTypeDescription { array_level: 1, kind: AbstractTypeKind::Classname("java/lang/Object".to_string())},
+                ]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Classname("java/lang/Object".to_string())},
+            },
+            todo_call
+        ),
+
+        (
+            "java/lang/invoke/MethodHandle",
+            "invoke",
+            MethodDescriptor {
+                argument_types: Box::new([
+                    AbstractTypeDescription { array_level: 1, kind: AbstractTypeKind::Classname("java/lang/Object".to_string())},
+                ]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Classname("java/lang/Object".to_string())},
+            },
+            todo_call
+        ),
+
+        (
+            "java/lang/invoke/MethodHandle",
+            "invokeBasic",
+            MethodDescriptor {
+                argument_types: Box::new([
+                    AbstractTypeDescription { array_level: 1, kind: AbstractTypeKind::Classname("java/lang/Object".to_string())},
+                ]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Classname("java/lang/Object".to_string())},
+            },
+            todo_call
+        ),
+
+        (
+            "java/lang/invoke/MethodHandle",
+            "linkToVirtual",
+            MethodDescriptor {
+                argument_types: Box::new([
+                    AbstractTypeDescription { array_level: 1, kind: AbstractTypeKind::Classname("java/lang/Object".to_string())},
+                ]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Classname("java/lang/Object".to_string())},
+            },
+            todo_call
+        ),
+
+        (
+            "java/lang/invoke/MethodHandle",
+            "linkToStatic",
+            MethodDescriptor {
+                argument_types: Box::new([
+                    AbstractTypeDescription { array_level: 1, kind: AbstractTypeKind::Classname("java/lang/Object".to_string())},
+                ]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Classname("java/lang/Object".to_string())},
+            },
+            todo_call
+        ),
+
+        (
+            "java/lang/invoke/MethodHandle",
+            "linkToSpecial",
+            MethodDescriptor {
+                argument_types: Box::new([
+                    AbstractTypeDescription { array_level: 1, kind: AbstractTypeKind::Classname("java/lang/Object".to_string())},
+                ]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Classname("java/lang/Object".to_string())},
+            },
+            todo_call
+        ),
+
+        (
+            "java/lang/invoke/MethodHandle",
+            "linkToInterface",
+            MethodDescriptor {
+                argument_types: Box::new([
+                    AbstractTypeDescription { array_level: 1, kind: AbstractTypeKind::Classname("java/lang/Object".to_string())},
+                ]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Classname("java/lang/Object".to_string())},
+            },
+            todo_call
+        ),
+
+        (
+            "java/lang/invoke/MethodHandle",
+            "linkToNative",
+            MethodDescriptor {
+                argument_types: Box::new([
+                    AbstractTypeDescription { array_level: 1, kind: AbstractTypeKind::Classname("java/lang/Object".to_string())},
+                ]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Classname("java/lang/Object".to_string())},
+            },
+            todo_call
+        ),
+
+        (
+            "jdk/internal/misc/CDS",
+            "getCDSConfigStatus",
+            MethodDescriptor {
+                argument_types: Box::new([
+                ]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Int() },
+            },
+            JdkInternalMiscCDS::get_cds_config_status
+        ),
+
+        (
+            "jdk/internal/misc/CDS",
+            "logLambdaFormInvoker",
+            MethodDescriptor {
+                argument_types: Box::new([
+                    AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Classname("java/lang/String".to_string())},
+                ]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Void() },
+            },
+            todo_call
+        ),
+
+        (
+            "jdk/internal/misc/CDS",
+            "initializeFromArchive",
+            MethodDescriptor {
+                argument_types: Box::new([
+                    AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Classname("java/lang/Class".to_string())},
+                ]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Void() },
+            },
+            ignore_call // TODO: idk
+        ),
+
+        (
+            "jdk/internal/misc/CDS",
+            "defineArchivedModules",
+            MethodDescriptor {
+                argument_types: Box::new([
+                    AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Classname("java/lang/ClassLoader".to_string())},
+                    AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Classname("java/lang/ClassLoader".to_string())},
+                ]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Void() },
+            },
+            todo_call
+        ),
+
+        (
+            "jdk/internal/misc/CDS",
+            "getRandomSeedForDumping",
+            MethodDescriptor {
+                argument_types: Box::new([
+                ]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Long() },
+            },
+            todo_call
+        ),
+
+        (
+            "jdk/internal/misc/CDS",
+            "dumpClassList",
+            MethodDescriptor {
+                argument_types: Box::new([
+                    AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Classname("java/lang/String".to_string())},
+                ]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Void() },
+            },
+            todo_call
+        ),
+
+        (
+            "jdk/internal/misc/CDS",
+            "dumpDynamicArchive",
+            MethodDescriptor {
+                argument_types: Box::new([
+                    AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Classname("java/lang/String".to_string())},
+                ]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Void() },
+            },
+            todo_call
+        ),
     ];
 
     for (classname, methodname, methoddescriptor, binding) in native_mappings {

src/stackframe.rs

@@ -8,7 +8,7 @@ pub enum StackValue {
     Boolean(bool),
     Byte(i8),
     Char(u16),
-    Short(u16),
+    Short(i16),
     Int(i32),
     Float(f32),
     Reference(ObjectReference),
@@ -47,6 +47,10 @@ impl OperandStack {
         }
     }
 
+    pub fn clear(&mut self) -> () {
+        self.depth = 0
+    }
+
     pub fn push(&mut self, value: StackValue) -> Result<(), Error> {
         if self.depth as usize == self.stack.len() {
             return Err(Error::PushError(format!("Trying to push onto full operand stack, capacity: {}, value: {:?}", self.depth, value)))
@@ -98,9 +102,15 @@ impl OperandStack {
                 self.push_long(l)
             }
 
-            _ => {
-                println!("{value:?}");
-                todo!();
+            FieldValue::Char(c) => {
+                self.push(StackValue::Char(c))
+            }
+
+            FieldValue::Short(s) => {
+                self.push(StackValue::Short(s))
+            }
+            FieldValue::Double(d) => {
+                self.push_double(d)
             }
         }
     }
@@ -187,7 +197,7 @@ impl OperandStack {
         }
     }
 
-    pub fn pop_short(&mut self, index: usize) -> Result<u16, Error> {
+    pub fn pop_short(&mut self, index: usize) -> Result<i16, Error> {
         let absolute_index = self.depth as usize - 1 - index;
         let value = self.stack[absolute_index];
         self.depth -= 1;
@@ -214,6 +224,7 @@ impl OperandStack {
         match value {
             StackValue::Int(i) => Ok(i),
             StackValue::Byte(b) => Ok(b as i32),
+            StackValue::Char(c) => Ok(c as i32),
             _ => Err(Error::LocalError(format!("Mismatched type at index {} of the function operand stack, expected Int-compatible but found '{:?}'", index, value)))
         }
     }