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stringlengths 9
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values | created_date
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```go
package references
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/rtda/heap"
// Invoke interface method
type INVOKE_INTERFACE struct {
index uint
// count uint8
// zero uint8
}
func (self *INVOKE_INTERFACE) FetchOperands(reader *base.BytecodeReader) {
self.index = uint(reader.ReadUint16())
reader.ReadUint8() // count
reader.ReadUint8() // must be 0
}
func (self *INVOKE_INTERFACE) Execute(frame *rtda.Frame) {
cp := frame.Method().Class().ConstantPool()
methodRef := cp.GetConstant(self.index).(*heap.InterfaceMethodRef)
resolvedMethod := methodRef.ResolvedInterfaceMethod()
if resolvedMethod.IsStatic() || resolvedMethod.IsPrivate() {
panic("java.lang.IncompatibleClassChangeError")
}
ref := frame.OperandStack().GetRefFromTop(resolvedMethod.ArgSlotCount() - 1)
if ref == nil {
panic("java.lang.NullPointerException") // todo
}
if !ref.Class().IsImplements(methodRef.ResolvedClass()) {
panic("java.lang.IncompatibleClassChangeError")
}
methodToBeInvoked := heap.LookupMethodInClass(ref.Class(),
methodRef.Name(), methodRef.Descriptor())
if methodToBeInvoked == nil || methodToBeInvoked.IsAbstract() {
panic("java.lang.AbstractMethodError")
}
if !methodToBeInvoked.IsPublic() {
panic("java.lang.IllegalAccessError")
}
base.InvokeMethod(frame, methodToBeInvoked)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/references/invokeinterface.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 349
|
```go
package references
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Get length of array
type ARRAY_LENGTH struct{ base.NoOperandsInstruction }
func (self *ARRAY_LENGTH) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
arrRef := stack.PopRef()
if arrRef == nil {
panic("java.lang.NullPointerException")
}
arrLen := arrRef.ArrayLength()
stack.PushInt(arrLen)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/references/arraylength.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 104
|
```go
package references
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/rtda/heap"
// Determine if object is of given type
type INSTANCE_OF struct{ base.Index16Instruction }
func (self *INSTANCE_OF) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
ref := stack.PopRef()
if ref == nil {
stack.PushInt(0)
return
}
cp := frame.Method().Class().ConstantPool()
classRef := cp.GetConstant(self.Index).(*heap.ClassRef)
class := classRef.ResolvedClass()
if ref.IsInstanceOf(class) {
stack.PushInt(1)
} else {
stack.PushInt(0)
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/references/instanceof.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 164
|
```go
package references
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/rtda/heap"
// Fetch field from object
type GET_FIELD struct{ base.Index16Instruction }
func (self *GET_FIELD) Execute(frame *rtda.Frame) {
cp := frame.Method().Class().ConstantPool()
fieldRef := cp.GetConstant(self.Index).(*heap.FieldRef)
field := fieldRef.ResolvedField()
if field.IsStatic() {
panic("java.lang.IncompatibleClassChangeError")
}
stack := frame.OperandStack()
ref := stack.PopRef()
if ref == nil {
panic("java.lang.NullPointerException")
}
descriptor := field.Descriptor()
slotId := field.SlotId()
slots := ref.Fields()
switch descriptor[0] {
case 'Z', 'B', 'C', 'S', 'I':
stack.PushInt(slots.GetInt(slotId))
case 'F':
stack.PushFloat(slots.GetFloat(slotId))
case 'J':
stack.PushLong(slots.GetLong(slotId))
case 'D':
stack.PushDouble(slots.GetDouble(slotId))
case 'L', '[':
stack.PushRef(slots.GetRef(slotId))
default:
// todo
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/references/getfield.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 275
|
```go
package references
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/rtda/heap"
// Create new object
type NEW struct{ base.Index16Instruction }
func (self *NEW) Execute(frame *rtda.Frame) {
cp := frame.Method().Class().ConstantPool()
classRef := cp.GetConstant(self.Index).(*heap.ClassRef)
class := classRef.ResolvedClass()
if !class.InitStarted() {
frame.RevertNextPC()
base.InitClass(frame.Thread(), class)
return
}
if class.IsInterface() || class.IsAbstract() {
panic("java.lang.InstantiationError")
}
ref := class.NewObject()
frame.OperandStack().PushRef(ref)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/references/new.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 167
|
```go
package references
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/rtda/heap"
// Set static field in class
type PUT_STATIC struct{ base.Index16Instruction }
func (self *PUT_STATIC) Execute(frame *rtda.Frame) {
currentMethod := frame.Method()
currentClass := currentMethod.Class()
cp := currentClass.ConstantPool()
fieldRef := cp.GetConstant(self.Index).(*heap.FieldRef)
field := fieldRef.ResolvedField()
class := field.Class()
if !class.InitStarted() {
frame.RevertNextPC()
base.InitClass(frame.Thread(), class)
return
}
if !field.IsStatic() {
panic("java.lang.IncompatibleClassChangeError")
}
if field.IsFinal() {
if currentClass != class || currentMethod.Name() != "<clinit>" {
panic("java.lang.IllegalAccessError")
}
}
descriptor := field.Descriptor()
slotId := field.SlotId()
slots := class.StaticVars()
stack := frame.OperandStack()
switch descriptor[0] {
case 'Z', 'B', 'C', 'S', 'I':
slots.SetInt(slotId, stack.PopInt())
case 'F':
slots.SetFloat(slotId, stack.PopFloat())
case 'J':
slots.SetLong(slotId, stack.PopLong())
case 'D':
slots.SetDouble(slotId, stack.PopDouble())
case 'L', '[':
slots.SetRef(slotId, stack.PopRef())
default:
// todo
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/references/putstatic.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 342
|
```go
package references
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/rtda/heap"
const (
//Array Type atype
AT_BOOLEAN = 4
AT_CHAR = 5
AT_FLOAT = 6
AT_DOUBLE = 7
AT_BYTE = 8
AT_SHORT = 9
AT_INT = 10
AT_LONG = 11
)
// Create new array
type NEW_ARRAY struct {
atype uint8
}
func (self *NEW_ARRAY) FetchOperands(reader *base.BytecodeReader) {
self.atype = reader.ReadUint8()
}
func (self *NEW_ARRAY) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
count := stack.PopInt()
if count < 0 {
panic("java.lang.NegativeArraySizeException")
}
classLoader := frame.Method().Class().Loader()
arrClass := getPrimitiveArrayClass(classLoader, self.atype)
arr := arrClass.NewArray(uint(count))
stack.PushRef(arr)
}
func getPrimitiveArrayClass(loader *heap.ClassLoader, atype uint8) *heap.Class {
switch atype {
case AT_BOOLEAN:
return loader.LoadClass("[Z")
case AT_BYTE:
return loader.LoadClass("[B")
case AT_CHAR:
return loader.LoadClass("[C")
case AT_SHORT:
return loader.LoadClass("[S")
case AT_INT:
return loader.LoadClass("[I")
case AT_LONG:
return loader.LoadClass("[J")
case AT_FLOAT:
return loader.LoadClass("[F")
case AT_DOUBLE:
return loader.LoadClass("[D")
default:
panic("Invalid atype!")
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/references/newarray.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 368
|
```go
package references
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/rtda/heap"
// Invoke instance method;
// special handling for superclass, private, and instance initialization method invocations
type INVOKE_SPECIAL struct{ base.Index16Instruction }
func (self *INVOKE_SPECIAL) Execute(frame *rtda.Frame) {
currentClass := frame.Method().Class()
cp := currentClass.ConstantPool()
methodRef := cp.GetConstant(self.Index).(*heap.MethodRef)
resolvedClass := methodRef.ResolvedClass()
resolvedMethod := methodRef.ResolvedMethod()
if resolvedMethod.Name() == "<init>" && resolvedMethod.Class() != resolvedClass {
panic("java.lang.NoSuchMethodError")
}
if resolvedMethod.IsStatic() {
panic("java.lang.IncompatibleClassChangeError")
}
ref := frame.OperandStack().GetRefFromTop(resolvedMethod.ArgSlotCount() - 1)
if ref == nil {
panic("java.lang.NullPointerException")
}
if resolvedMethod.IsProtected() &&
resolvedMethod.Class().IsSuperClassOf(currentClass) &&
resolvedMethod.Class().GetPackageName() != currentClass.GetPackageName() &&
ref.Class() != currentClass &&
!ref.Class().IsSubClassOf(currentClass) {
panic("java.lang.IllegalAccessError")
}
methodToBeInvoked := resolvedMethod
if currentClass.IsSuper() &&
resolvedClass.IsSuperClassOf(currentClass) &&
resolvedMethod.Name() != "<init>" {
methodToBeInvoked = heap.LookupMethodInClass(currentClass.SuperClass(),
methodRef.Name(), methodRef.Descriptor())
}
if methodToBeInvoked == nil || methodToBeInvoked.IsAbstract() {
panic("java.lang.AbstractMethodError")
}
base.InvokeMethod(frame, methodToBeInvoked)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/references/invokespecial.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 403
|
```go
package references
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/rtda/heap"
// Create new array of reference
type ANEW_ARRAY struct{ base.Index16Instruction }
func (self *ANEW_ARRAY) Execute(frame *rtda.Frame) {
cp := frame.Method().Class().ConstantPool()
classRef := cp.GetConstant(self.Index).(*heap.ClassRef)
componentClass := classRef.ResolvedClass()
// if componentClass.InitializationNotStarted() {
// thread := frame.Thread()
// frame.SetNextPC(thread.PC()) // undo anewarray
// thread.InitClass(componentClass)
// return
// }
stack := frame.OperandStack()
count := stack.PopInt()
if count < 0 {
panic("java.lang.NegativeArraySizeException")
}
arrClass := componentClass.ArrayClass()
arr := arrClass.NewArray(uint(count))
stack.PushRef(arr)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/references/anewarray.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 214
|
```go
package references
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/rtda/heap"
// Set field in object
type PUT_FIELD struct{ base.Index16Instruction }
func (self *PUT_FIELD) Execute(frame *rtda.Frame) {
currentMethod := frame.Method()
currentClass := currentMethod.Class()
cp := currentClass.ConstantPool()
fieldRef := cp.GetConstant(self.Index).(*heap.FieldRef)
field := fieldRef.ResolvedField()
if field.IsStatic() {
panic("java.lang.IncompatibleClassChangeError")
}
if field.IsFinal() {
if currentClass != field.Class() || currentMethod.Name() != "<init>" {
panic("java.lang.IllegalAccessError")
}
}
descriptor := field.Descriptor()
slotId := field.SlotId()
stack := frame.OperandStack()
switch descriptor[0] {
case 'Z', 'B', 'C', 'S', 'I':
val := stack.PopInt()
ref := stack.PopRef()
if ref == nil {
panic("java.lang.NullPointerException")
}
ref.Fields().SetInt(slotId, val)
case 'F':
val := stack.PopFloat()
ref := stack.PopRef()
if ref == nil {
panic("java.lang.NullPointerException")
}
ref.Fields().SetFloat(slotId, val)
case 'J':
val := stack.PopLong()
ref := stack.PopRef()
if ref == nil {
panic("java.lang.NullPointerException")
}
ref.Fields().SetLong(slotId, val)
case 'D':
val := stack.PopDouble()
ref := stack.PopRef()
if ref == nil {
panic("java.lang.NullPointerException")
}
ref.Fields().SetDouble(slotId, val)
case 'L', '[':
val := stack.PopRef()
ref := stack.PopRef()
if ref == nil {
panic("java.lang.NullPointerException")
}
ref.Fields().SetRef(slotId, val)
default:
// todo
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/references/putfield.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 453
|
```go
package references
import "fmt"
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/rtda/heap"
// Invoke instance method; dispatch based on class
type INVOKE_VIRTUAL struct{ base.Index16Instruction }
func (self *INVOKE_VIRTUAL) Execute(frame *rtda.Frame) {
currentClass := frame.Method().Class()
cp := currentClass.ConstantPool()
methodRef := cp.GetConstant(self.Index).(*heap.MethodRef)
resolvedMethod := methodRef.ResolvedMethod()
if resolvedMethod.IsStatic() {
panic("java.lang.IncompatibleClassChangeError")
}
ref := frame.OperandStack().GetRefFromTop(resolvedMethod.ArgSlotCount() - 1)
if ref == nil {
// hack!
if methodRef.Name() == "println" {
_println(frame.OperandStack(), methodRef.Descriptor())
return
}
panic("java.lang.NullPointerException")
}
if resolvedMethod.IsProtected() &&
resolvedMethod.Class().IsSuperClassOf(currentClass) &&
resolvedMethod.Class().GetPackageName() != currentClass.GetPackageName() &&
ref.Class() != currentClass &&
!ref.Class().IsSubClassOf(currentClass) {
if !(ref.Class().IsArray() && resolvedMethod.Name() == "clone") {
panic("java.lang.IllegalAccessError")
}
}
methodToBeInvoked := heap.LookupMethodInClass(ref.Class(),
methodRef.Name(), methodRef.Descriptor())
if methodToBeInvoked == nil || methodToBeInvoked.IsAbstract() {
panic("java.lang.AbstractMethodError")
}
base.InvokeMethod(frame, methodToBeInvoked)
}
// hack!
func _println(stack *rtda.OperandStack, descriptor string) {
switch descriptor {
case "(Z)V":
fmt.Printf("%v\n", stack.PopInt() != 0)
case "(C)V":
fmt.Printf("%c\n", stack.PopInt())
case "(I)V", "(B)V", "(S)V":
fmt.Printf("%v\n", stack.PopInt())
case "(F)V":
fmt.Printf("%v\n", stack.PopFloat())
case "(J)V":
fmt.Printf("%v\n", stack.PopLong())
case "(D)V":
fmt.Printf("%v\n", stack.PopDouble())
case "(Ljava/lang/String;)V":
jStr := stack.PopRef()
goStr := heap.GoString(jStr)
fmt.Println(goStr)
default:
panic("println: " + descriptor)
}
stack.PopRef()
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/references/invokevirtual.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 551
|
```go
package references
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/rtda/heap"
// Create new multidimensional array
type MULTI_ANEW_ARRAY struct {
index uint16
dimensions uint8
}
func (self *MULTI_ANEW_ARRAY) FetchOperands(reader *base.BytecodeReader) {
self.index = reader.ReadUint16()
self.dimensions = reader.ReadUint8()
}
func (self *MULTI_ANEW_ARRAY) Execute(frame *rtda.Frame) {
cp := frame.Method().Class().ConstantPool()
classRef := cp.GetConstant(uint(self.index)).(*heap.ClassRef)
arrClass := classRef.ResolvedClass()
stack := frame.OperandStack()
counts := popAndCheckCounts(stack, int(self.dimensions))
arr := newMultiDimensionalArray(counts, arrClass)
stack.PushRef(arr)
}
func popAndCheckCounts(stack *rtda.OperandStack, dimensions int) []int32 {
counts := make([]int32, dimensions)
for i := dimensions - 1; i >= 0; i-- {
counts[i] = stack.PopInt()
if counts[i] < 0 {
panic("java.lang.NegativeArraySizeException")
}
}
return counts
}
func newMultiDimensionalArray(counts []int32, arrClass *heap.Class) *heap.Object {
count := uint(counts[0])
arr := arrClass.NewArray(count)
if len(counts) > 1 {
refs := arr.Refs()
for i := range refs {
refs[i] = newMultiDimensionalArray(counts[1:], arrClass.ComponentClass())
}
}
return arr
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/references/multianewarray.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 373
|
```go
package loads
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Load reference from local variable
type ALOAD struct{ base.Index8Instruction }
func (self *ALOAD) Execute(frame *rtda.Frame) {
_aload(frame, self.Index)
}
type ALOAD_0 struct{ base.NoOperandsInstruction }
func (self *ALOAD_0) Execute(frame *rtda.Frame) {
_aload(frame, 0)
}
type ALOAD_1 struct{ base.NoOperandsInstruction }
func (self *ALOAD_1) Execute(frame *rtda.Frame) {
_aload(frame, 1)
}
type ALOAD_2 struct{ base.NoOperandsInstruction }
func (self *ALOAD_2) Execute(frame *rtda.Frame) {
_aload(frame, 2)
}
type ALOAD_3 struct{ base.NoOperandsInstruction }
func (self *ALOAD_3) Execute(frame *rtda.Frame) {
_aload(frame, 3)
}
func _aload(frame *rtda.Frame, index uint) {
ref := frame.LocalVars().GetRef(index)
frame.OperandStack().PushRef(ref)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/loads/aload.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 262
|
```go
package loads
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Load double from local variable
type DLOAD struct{ base.Index8Instruction }
func (self *DLOAD) Execute(frame *rtda.Frame) {
_dload(frame, self.Index)
}
type DLOAD_0 struct{ base.NoOperandsInstruction }
func (self *DLOAD_0) Execute(frame *rtda.Frame) {
_dload(frame, 0)
}
type DLOAD_1 struct{ base.NoOperandsInstruction }
func (self *DLOAD_1) Execute(frame *rtda.Frame) {
_dload(frame, 1)
}
type DLOAD_2 struct{ base.NoOperandsInstruction }
func (self *DLOAD_2) Execute(frame *rtda.Frame) {
_dload(frame, 2)
}
type DLOAD_3 struct{ base.NoOperandsInstruction }
func (self *DLOAD_3) Execute(frame *rtda.Frame) {
_dload(frame, 3)
}
func _dload(frame *rtda.Frame, index uint) {
val := frame.LocalVars().GetDouble(index)
frame.OperandStack().PushDouble(val)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/loads/dload.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 263
|
```go
package loads
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/rtda/heap"
// Load reference from array
type AALOAD struct{ base.NoOperandsInstruction }
func (self *AALOAD) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
index := stack.PopInt()
arrRef := stack.PopRef()
checkNotNil(arrRef)
refs := arrRef.Refs()
checkIndex(len(refs), index)
stack.PushRef(refs[index])
}
// Load byte or boolean from array
type BALOAD struct{ base.NoOperandsInstruction }
func (self *BALOAD) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
index := stack.PopInt()
arrRef := stack.PopRef()
checkNotNil(arrRef)
bytes := arrRef.Bytes()
checkIndex(len(bytes), index)
stack.PushInt(int32(bytes[index]))
}
// Load char from array
type CALOAD struct{ base.NoOperandsInstruction }
func (self *CALOAD) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
index := stack.PopInt()
arrRef := stack.PopRef()
checkNotNil(arrRef)
chars := arrRef.Chars()
checkIndex(len(chars), index)
stack.PushInt(int32(chars[index]))
}
// Load double from array
type DALOAD struct{ base.NoOperandsInstruction }
func (self *DALOAD) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
index := stack.PopInt()
arrRef := stack.PopRef()
checkNotNil(arrRef)
doubles := arrRef.Doubles()
checkIndex(len(doubles), index)
stack.PushDouble(doubles[index])
}
// Load float from array
type FALOAD struct{ base.NoOperandsInstruction }
func (self *FALOAD) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
index := stack.PopInt()
arrRef := stack.PopRef()
checkNotNil(arrRef)
floats := arrRef.Floats()
checkIndex(len(floats), index)
stack.PushFloat(floats[index])
}
// Load int from array
type IALOAD struct{ base.NoOperandsInstruction }
func (self *IALOAD) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
index := stack.PopInt()
arrRef := stack.PopRef()
checkNotNil(arrRef)
ints := arrRef.Ints()
checkIndex(len(ints), index)
stack.PushInt(ints[index])
}
// Load long from array
type LALOAD struct{ base.NoOperandsInstruction }
func (self *LALOAD) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
index := stack.PopInt()
arrRef := stack.PopRef()
checkNotNil(arrRef)
longs := arrRef.Longs()
checkIndex(len(longs), index)
stack.PushLong(longs[index])
}
// Load short from array
type SALOAD struct{ base.NoOperandsInstruction }
func (self *SALOAD) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
index := stack.PopInt()
arrRef := stack.PopRef()
checkNotNil(arrRef)
shorts := arrRef.Shorts()
checkIndex(len(shorts), index)
stack.PushInt(int32(shorts[index]))
}
func checkNotNil(ref *heap.Object) {
if ref == nil {
panic("java.lang.NullPointerException")
}
}
func checkIndex(arrLen int, index int32) {
if index < 0 || index >= int32(arrLen) {
panic("ArrayIndexOutOfBoundsException")
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/loads/xaload.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 766
|
```go
package loads
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Load int from local variable
type ILOAD struct{ base.Index8Instruction }
func (self *ILOAD) Execute(frame *rtda.Frame) {
_iload(frame, self.Index)
}
type ILOAD_0 struct{ base.NoOperandsInstruction }
func (self *ILOAD_0) Execute(frame *rtda.Frame) {
_iload(frame, 0)
}
type ILOAD_1 struct{ base.NoOperandsInstruction }
func (self *ILOAD_1) Execute(frame *rtda.Frame) {
_iload(frame, 1)
}
type ILOAD_2 struct{ base.NoOperandsInstruction }
func (self *ILOAD_2) Execute(frame *rtda.Frame) {
_iload(frame, 2)
}
type ILOAD_3 struct{ base.NoOperandsInstruction }
func (self *ILOAD_3) Execute(frame *rtda.Frame) {
_iload(frame, 3)
}
func _iload(frame *rtda.Frame, index uint) {
val := frame.LocalVars().GetInt(index)
frame.OperandStack().PushInt(val)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/loads/iload.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 262
|
```go
package loads
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Load float from local variable
type FLOAD struct{ base.Index8Instruction }
func (self *FLOAD) Execute(frame *rtda.Frame) {
_fload(frame, self.Index)
}
type FLOAD_0 struct{ base.NoOperandsInstruction }
func (self *FLOAD_0) Execute(frame *rtda.Frame) {
_fload(frame, 0)
}
type FLOAD_1 struct{ base.NoOperandsInstruction }
func (self *FLOAD_1) Execute(frame *rtda.Frame) {
_fload(frame, 1)
}
type FLOAD_2 struct{ base.NoOperandsInstruction }
func (self *FLOAD_2) Execute(frame *rtda.Frame) {
_fload(frame, 2)
}
type FLOAD_3 struct{ base.NoOperandsInstruction }
func (self *FLOAD_3) Execute(frame *rtda.Frame) {
_fload(frame, 3)
}
func _fload(frame *rtda.Frame, index uint) {
val := frame.LocalVars().GetFloat(index)
frame.OperandStack().PushFloat(val)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/loads/fload.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 263
|
```go
package loads
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Load long from local variable
type LLOAD struct{ base.Index8Instruction }
func (self *LLOAD) Execute(frame *rtda.Frame) {
_lload(frame, self.Index)
}
type LLOAD_0 struct{ base.NoOperandsInstruction }
func (self *LLOAD_0) Execute(frame *rtda.Frame) {
_lload(frame, 0)
}
type LLOAD_1 struct{ base.NoOperandsInstruction }
func (self *LLOAD_1) Execute(frame *rtda.Frame) {
_lload(frame, 1)
}
type LLOAD_2 struct{ base.NoOperandsInstruction }
func (self *LLOAD_2) Execute(frame *rtda.Frame) {
_lload(frame, 2)
}
type LLOAD_3 struct{ base.NoOperandsInstruction }
func (self *LLOAD_3) Execute(frame *rtda.Frame) {
_lload(frame, 3)
}
func _lload(frame *rtda.Frame, index uint) {
val := frame.LocalVars().GetLong(index)
frame.OperandStack().PushLong(val)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/loads/lload.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 263
|
```go
package extended
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Branch if reference is null
type IFNULL struct{ base.BranchInstruction }
func (self *IFNULL) Execute(frame *rtda.Frame) {
ref := frame.OperandStack().PopRef()
if ref == nil {
base.Branch(frame, self.Offset)
}
}
// Branch if reference not null
type IFNONNULL struct{ base.BranchInstruction }
func (self *IFNONNULL) Execute(frame *rtda.Frame) {
ref := frame.OperandStack().PopRef()
if ref != nil {
base.Branch(frame, self.Offset)
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/extended/ifnull.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 144
|
```go
package extended
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/instructions/loads"
import "jvmgo/ch09/instructions/math"
import "jvmgo/ch09/instructions/stores"
import "jvmgo/ch09/rtda"
// Extend local variable index by additional bytes
type WIDE struct {
modifiedInstruction base.Instruction
}
func (self *WIDE) FetchOperands(reader *base.BytecodeReader) {
opcode := reader.ReadUint8()
switch opcode {
case 0x15:
inst := &loads.ILOAD{}
inst.Index = uint(reader.ReadUint16())
self.modifiedInstruction = inst
case 0x16:
inst := &loads.LLOAD{}
inst.Index = uint(reader.ReadUint16())
self.modifiedInstruction = inst
case 0x17:
inst := &loads.FLOAD{}
inst.Index = uint(reader.ReadUint16())
self.modifiedInstruction = inst
case 0x18:
inst := &loads.DLOAD{}
inst.Index = uint(reader.ReadUint16())
self.modifiedInstruction = inst
case 0x19:
inst := &loads.ALOAD{}
inst.Index = uint(reader.ReadUint16())
self.modifiedInstruction = inst
case 0x36:
inst := &stores.ISTORE{}
inst.Index = uint(reader.ReadUint16())
self.modifiedInstruction = inst
case 0x37:
inst := &stores.LSTORE{}
inst.Index = uint(reader.ReadUint16())
self.modifiedInstruction = inst
case 0x38:
inst := &stores.FSTORE{}
inst.Index = uint(reader.ReadUint16())
self.modifiedInstruction = inst
case 0x39:
inst := &stores.DSTORE{}
inst.Index = uint(reader.ReadUint16())
self.modifiedInstruction = inst
case 0x3a:
inst := &stores.ASTORE{}
inst.Index = uint(reader.ReadUint16())
self.modifiedInstruction = inst
case 0x84:
inst := &math.IINC{}
inst.Index = uint(reader.ReadUint16())
inst.Const = int32(reader.ReadInt16())
self.modifiedInstruction = inst
case 0xa9: // ret
panic("Unsupported opcode: 0xa9!")
}
}
func (self *WIDE) Execute(frame *rtda.Frame) {
self.modifiedInstruction.Execute(frame)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/extended/wide.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 511
|
```go
package extended
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Branch always (wide index)
type GOTO_W struct {
offset int
}
func (self *GOTO_W) FetchOperands(reader *base.BytecodeReader) {
self.offset = int(reader.ReadInt32())
}
func (self *GOTO_W) Execute(frame *rtda.Frame) {
base.Branch(frame, self.offset)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/extended/goto_w.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 96
|
```go
package comparisons
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Compare long
type LCMP struct{ base.NoOperandsInstruction }
func (self *LCMP) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
v2 := stack.PopLong()
v1 := stack.PopLong()
if v1 > v2 {
stack.PushInt(1)
} else if v1 == v2 {
stack.PushInt(0)
} else {
stack.PushInt(-1)
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/comparisons/lcmp.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 123
|
```go
package comparisons
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Branch if int comparison with zero succeeds
type IFEQ struct{ base.BranchInstruction }
func (self *IFEQ) Execute(frame *rtda.Frame) {
val := frame.OperandStack().PopInt()
if val == 0 {
base.Branch(frame, self.Offset)
}
}
type IFNE struct{ base.BranchInstruction }
func (self *IFNE) Execute(frame *rtda.Frame) {
val := frame.OperandStack().PopInt()
if val != 0 {
base.Branch(frame, self.Offset)
}
}
type IFLT struct{ base.BranchInstruction }
func (self *IFLT) Execute(frame *rtda.Frame) {
val := frame.OperandStack().PopInt()
if val < 0 {
base.Branch(frame, self.Offset)
}
}
type IFLE struct{ base.BranchInstruction }
func (self *IFLE) Execute(frame *rtda.Frame) {
val := frame.OperandStack().PopInt()
if val <= 0 {
base.Branch(frame, self.Offset)
}
}
type IFGT struct{ base.BranchInstruction }
func (self *IFGT) Execute(frame *rtda.Frame) {
val := frame.OperandStack().PopInt()
if val > 0 {
base.Branch(frame, self.Offset)
}
}
type IFGE struct{ base.BranchInstruction }
func (self *IFGE) Execute(frame *rtda.Frame) {
val := frame.OperandStack().PopInt()
if val >= 0 {
base.Branch(frame, self.Offset)
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/comparisons/ifcond.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 348
|
```go
package comparisons
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Compare float
type FCMPG struct{ base.NoOperandsInstruction }
func (self *FCMPG) Execute(frame *rtda.Frame) {
_fcmp(frame, true)
}
type FCMPL struct{ base.NoOperandsInstruction }
func (self *FCMPL) Execute(frame *rtda.Frame) {
_fcmp(frame, false)
}
func _fcmp(frame *rtda.Frame, gFlag bool) {
stack := frame.OperandStack()
v2 := stack.PopFloat()
v1 := stack.PopFloat()
if v1 > v2 {
stack.PushInt(1)
} else if v1 == v2 {
stack.PushInt(0)
} else if v1 < v2 {
stack.PushInt(-1)
} else if gFlag {
stack.PushInt(1)
} else {
stack.PushInt(-1)
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/comparisons/fcmp.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 217
|
```go
package comparisons
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Compare double
type DCMPG struct{ base.NoOperandsInstruction }
func (self *DCMPG) Execute(frame *rtda.Frame) {
_dcmp(frame, true)
}
type DCMPL struct{ base.NoOperandsInstruction }
func (self *DCMPL) Execute(frame *rtda.Frame) {
_dcmp(frame, false)
}
func _dcmp(frame *rtda.Frame, gFlag bool) {
stack := frame.OperandStack()
v2 := stack.PopDouble()
v1 := stack.PopDouble()
if v1 > v2 {
stack.PushInt(1)
} else if v1 == v2 {
stack.PushInt(0)
} else if v1 < v2 {
stack.PushInt(-1)
} else if gFlag {
stack.PushInt(1)
} else {
stack.PushInt(-1)
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/comparisons/dcmp.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 217
|
```go
package comparisons
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Branch if reference comparison succeeds
type IF_ACMPEQ struct{ base.BranchInstruction }
func (self *IF_ACMPEQ) Execute(frame *rtda.Frame) {
if _acmp(frame) {
base.Branch(frame, self.Offset)
}
}
type IF_ACMPNE struct{ base.BranchInstruction }
func (self *IF_ACMPNE) Execute(frame *rtda.Frame) {
if !_acmp(frame) {
base.Branch(frame, self.Offset)
}
}
func _acmp(frame *rtda.Frame) bool {
stack := frame.OperandStack()
ref2 := stack.PopRef()
ref1 := stack.PopRef()
return ref1 == ref2 // todo
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/comparisons/if_acmp.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 173
|
```go
package comparisons
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Branch if int comparison succeeds
type IF_ICMPEQ struct{ base.BranchInstruction }
func (self *IF_ICMPEQ) Execute(frame *rtda.Frame) {
if val1, val2 := _icmpPop(frame); val1 == val2 {
base.Branch(frame, self.Offset)
}
}
type IF_ICMPNE struct{ base.BranchInstruction }
func (self *IF_ICMPNE) Execute(frame *rtda.Frame) {
if val1, val2 := _icmpPop(frame); val1 != val2 {
base.Branch(frame, self.Offset)
}
}
type IF_ICMPLT struct{ base.BranchInstruction }
func (self *IF_ICMPLT) Execute(frame *rtda.Frame) {
if val1, val2 := _icmpPop(frame); val1 < val2 {
base.Branch(frame, self.Offset)
}
}
type IF_ICMPLE struct{ base.BranchInstruction }
func (self *IF_ICMPLE) Execute(frame *rtda.Frame) {
if val1, val2 := _icmpPop(frame); val1 <= val2 {
base.Branch(frame, self.Offset)
}
}
type IF_ICMPGT struct{ base.BranchInstruction }
func (self *IF_ICMPGT) Execute(frame *rtda.Frame) {
if val1, val2 := _icmpPop(frame); val1 > val2 {
base.Branch(frame, self.Offset)
}
}
type IF_ICMPGE struct{ base.BranchInstruction }
func (self *IF_ICMPGE) Execute(frame *rtda.Frame) {
if val1, val2 := _icmpPop(frame); val1 >= val2 {
base.Branch(frame, self.Offset)
}
}
func _icmpPop(frame *rtda.Frame) (val1, val2 int32) {
stack := frame.OperandStack()
val2 = stack.PopInt()
val1 = stack.PopInt()
return
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/comparisons/if_icmp.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 430
|
```go
package constants
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Do nothing
type NOP struct{ base.NoOperandsInstruction }
func (self *NOP) Execute(frame *rtda.Frame) {
// really do nothing
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/constants/nop.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 62
|
```go
package constants
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/rtda/heap"
// Push item from run-time constant pool
type LDC struct{ base.Index8Instruction }
func (self *LDC) Execute(frame *rtda.Frame) {
_ldc(frame, self.Index)
}
// Push item from run-time constant pool (wide index)
type LDC_W struct{ base.Index16Instruction }
func (self *LDC_W) Execute(frame *rtda.Frame) {
_ldc(frame, self.Index)
}
func _ldc(frame *rtda.Frame, index uint) {
stack := frame.OperandStack()
class := frame.Method().Class()
c := class.ConstantPool().GetConstant(index)
switch c.(type) {
case int32:
stack.PushInt(c.(int32))
case float32:
stack.PushFloat(c.(float32))
case string:
internedStr := heap.JString(class.Loader(), c.(string))
stack.PushRef(internedStr)
case *heap.ClassRef:
classRef := c.(*heap.ClassRef)
classObj := classRef.ResolvedClass().JClass()
stack.PushRef(classObj)
// case MethodType, MethodHandle
default:
panic("todo: ldc!")
}
}
// Push long or double from run-time constant pool (wide index)
type LDC2_W struct{ base.Index16Instruction }
func (self *LDC2_W) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
cp := frame.Method().Class().ConstantPool()
c := cp.GetConstant(self.Index)
switch c.(type) {
case int64:
stack.PushLong(c.(int64))
case float64:
stack.PushDouble(c.(float64))
default:
panic("java.lang.ClassFormatError")
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/constants/ldc.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 403
|
```go
package constants
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Push byte
type BIPUSH struct {
val int8
}
func (self *BIPUSH) FetchOperands(reader *base.BytecodeReader) {
self.val = reader.ReadInt8()
}
func (self *BIPUSH) Execute(frame *rtda.Frame) {
i := int32(self.val)
frame.OperandStack().PushInt(i)
}
// Push short
type SIPUSH struct {
val int16
}
func (self *SIPUSH) FetchOperands(reader *base.BytecodeReader) {
self.val = reader.ReadInt16()
}
func (self *SIPUSH) Execute(frame *rtda.Frame) {
i := int32(self.val)
frame.OperandStack().PushInt(i)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/constants/ipush.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 177
|
```go
package reserved
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/native"
import _ "jvmgo/ch09/native/java/lang"
import _ "jvmgo/ch09/native/sun/misc"
// Invoke native method
type INVOKE_NATIVE struct{ base.NoOperandsInstruction }
func (self *INVOKE_NATIVE) Execute(frame *rtda.Frame) {
method := frame.Method()
className := method.Class().Name()
methodName := method.Name()
methodDescriptor := method.Descriptor()
nativeMethod := native.FindNativeMethod(className, methodName, methodDescriptor)
if nativeMethod == nil {
methodInfo := className + "." + methodName + methodDescriptor
panic("java.lang.UnsatisfiedLinkError: " + methodInfo)
}
nativeMethod(frame)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/reserved/invokenative.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 177
|
```go
package constants
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Push null
type ACONST_NULL struct{ base.NoOperandsInstruction }
func (self *ACONST_NULL) Execute(frame *rtda.Frame) {
frame.OperandStack().PushRef(nil)
}
// Push double
type DCONST_0 struct{ base.NoOperandsInstruction }
func (self *DCONST_0) Execute(frame *rtda.Frame) {
frame.OperandStack().PushDouble(0.0)
}
type DCONST_1 struct{ base.NoOperandsInstruction }
func (self *DCONST_1) Execute(frame *rtda.Frame) {
frame.OperandStack().PushDouble(1.0)
}
// Push float
type FCONST_0 struct{ base.NoOperandsInstruction }
func (self *FCONST_0) Execute(frame *rtda.Frame) {
frame.OperandStack().PushFloat(0.0)
}
type FCONST_1 struct{ base.NoOperandsInstruction }
func (self *FCONST_1) Execute(frame *rtda.Frame) {
frame.OperandStack().PushFloat(1.0)
}
type FCONST_2 struct{ base.NoOperandsInstruction }
func (self *FCONST_2) Execute(frame *rtda.Frame) {
frame.OperandStack().PushFloat(2.0)
}
// Push int constant
type ICONST_M1 struct{ base.NoOperandsInstruction }
func (self *ICONST_M1) Execute(frame *rtda.Frame) {
frame.OperandStack().PushInt(-1)
}
type ICONST_0 struct{ base.NoOperandsInstruction }
func (self *ICONST_0) Execute(frame *rtda.Frame) {
frame.OperandStack().PushInt(0)
}
type ICONST_1 struct{ base.NoOperandsInstruction }
func (self *ICONST_1) Execute(frame *rtda.Frame) {
frame.OperandStack().PushInt(1)
}
type ICONST_2 struct{ base.NoOperandsInstruction }
func (self *ICONST_2) Execute(frame *rtda.Frame) {
frame.OperandStack().PushInt(2)
}
type ICONST_3 struct{ base.NoOperandsInstruction }
func (self *ICONST_3) Execute(frame *rtda.Frame) {
frame.OperandStack().PushInt(3)
}
type ICONST_4 struct{ base.NoOperandsInstruction }
func (self *ICONST_4) Execute(frame *rtda.Frame) {
frame.OperandStack().PushInt(4)
}
type ICONST_5 struct{ base.NoOperandsInstruction }
func (self *ICONST_5) Execute(frame *rtda.Frame) {
frame.OperandStack().PushInt(5)
}
// Push long constant
type LCONST_0 struct{ base.NoOperandsInstruction }
func (self *LCONST_0) Execute(frame *rtda.Frame) {
frame.OperandStack().PushLong(0)
}
type LCONST_1 struct{ base.NoOperandsInstruction }
func (self *LCONST_1) Execute(frame *rtda.Frame) {
frame.OperandStack().PushLong(1)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/constants/const.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 688
|
```go
package stack
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Pop the top operand stack value
type POP struct{ base.NoOperandsInstruction }
func (self *POP) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
stack.PopSlot()
}
// Pop the top one or two operand stack values
type POP2 struct{ base.NoOperandsInstruction }
func (self *POP2) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
stack.PopSlot()
stack.PopSlot()
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/stack/pop.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 125
|
```go
package stack
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Swap the top two operand stack values
type SWAP struct{ base.NoOperandsInstruction }
func (self *SWAP) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
slot1 := stack.PopSlot()
slot2 := stack.PopSlot()
stack.PushSlot(slot1)
stack.PushSlot(slot2)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/stack/swap.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 96
|
```go
package conversions
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Convert double to float
type D2F struct{ base.NoOperandsInstruction }
func (self *D2F) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
d := stack.PopDouble()
f := float32(d)
stack.PushFloat(f)
}
// Convert double to int
type D2I struct{ base.NoOperandsInstruction }
func (self *D2I) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
d := stack.PopDouble()
i := int32(d)
stack.PushInt(i)
}
// Convert double to long
type D2L struct{ base.NoOperandsInstruction }
func (self *D2L) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
d := stack.PopDouble()
l := int64(d)
stack.PushLong(l)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/conversions/d2x.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 206
|
```go
package stack
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Duplicate the top operand stack value
type DUP struct{ base.NoOperandsInstruction }
func (self *DUP) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
slot := stack.PopSlot()
stack.PushSlot(slot)
stack.PushSlot(slot)
}
// Duplicate the top operand stack value and insert two values down
type DUP_X1 struct{ base.NoOperandsInstruction }
func (self *DUP_X1) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
slot1 := stack.PopSlot()
slot2 := stack.PopSlot()
stack.PushSlot(slot1)
stack.PushSlot(slot2)
stack.PushSlot(slot1)
}
// Duplicate the top operand stack value and insert two or three values down
type DUP_X2 struct{ base.NoOperandsInstruction }
func (self *DUP_X2) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
slot1 := stack.PopSlot()
slot2 := stack.PopSlot()
slot3 := stack.PopSlot()
stack.PushSlot(slot1)
stack.PushSlot(slot3)
stack.PushSlot(slot2)
stack.PushSlot(slot1)
}
// Duplicate the top one or two operand stack values
type DUP2 struct{ base.NoOperandsInstruction }
func (self *DUP2) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
slot1 := stack.PopSlot()
slot2 := stack.PopSlot()
stack.PushSlot(slot2)
stack.PushSlot(slot1)
stack.PushSlot(slot2)
stack.PushSlot(slot1)
}
// Duplicate the top one or two operand stack values and insert two or three values down
type DUP2_X1 struct{ base.NoOperandsInstruction }
func (self *DUP2_X1) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
slot1 := stack.PopSlot()
slot2 := stack.PopSlot()
slot3 := stack.PopSlot()
stack.PushSlot(slot2)
stack.PushSlot(slot1)
stack.PushSlot(slot3)
stack.PushSlot(slot2)
stack.PushSlot(slot1)
}
// Duplicate the top one or two operand stack values and insert two, three, or four values down
type DUP2_X2 struct{ base.NoOperandsInstruction }
func (self *DUP2_X2) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
slot1 := stack.PopSlot()
slot2 := stack.PopSlot()
slot3 := stack.PopSlot()
slot4 := stack.PopSlot()
stack.PushSlot(slot2)
stack.PushSlot(slot1)
stack.PushSlot(slot4)
stack.PushSlot(slot3)
stack.PushSlot(slot2)
stack.PushSlot(slot1)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/stack/dup.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 584
|
```go
package conversions
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Convert int to byte
type I2B struct{ base.NoOperandsInstruction }
func (self *I2B) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
i := stack.PopInt()
b := int32(int8(i))
stack.PushInt(b)
}
// Convert int to char
type I2C struct{ base.NoOperandsInstruction }
func (self *I2C) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
i := stack.PopInt()
c := int32(uint16(i))
stack.PushInt(c)
}
// Convert int to short
type I2S struct{ base.NoOperandsInstruction }
func (self *I2S) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
i := stack.PopInt()
s := int32(int16(i))
stack.PushInt(s)
}
// Convert int to long
type I2L struct{ base.NoOperandsInstruction }
func (self *I2L) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
i := stack.PopInt()
l := int64(i)
stack.PushLong(l)
}
// Convert int to float
type I2F struct{ base.NoOperandsInstruction }
func (self *I2F) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
i := stack.PopInt()
f := float32(i)
stack.PushFloat(f)
}
// Convert int to double
type I2D struct{ base.NoOperandsInstruction }
func (self *I2D) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
i := stack.PopInt()
d := float64(i)
stack.PushDouble(d)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/conversions/i2x.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 392
|
```go
package conversions
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Convert float to double
type F2D struct{ base.NoOperandsInstruction }
func (self *F2D) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
f := stack.PopFloat()
d := float64(f)
stack.PushDouble(d)
}
// Convert float to int
type F2I struct{ base.NoOperandsInstruction }
func (self *F2I) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
f := stack.PopFloat()
i := int32(f)
stack.PushInt(i)
}
// Convert float to long
type F2L struct{ base.NoOperandsInstruction }
func (self *F2L) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
f := stack.PopFloat()
l := int64(f)
stack.PushLong(l)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/conversions/f2x.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 206
|
```go
package conversions
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Convert long to double
type L2D struct{ base.NoOperandsInstruction }
func (self *L2D) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
l := stack.PopLong()
d := float64(l)
stack.PushDouble(d)
}
// Convert long to float
type L2F struct{ base.NoOperandsInstruction }
func (self *L2F) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
l := stack.PopLong()
f := float32(l)
stack.PushFloat(f)
}
// Convert long to int
type L2I struct{ base.NoOperandsInstruction }
func (self *L2I) Execute(frame *rtda.Frame) {
stack := frame.OperandStack()
l := stack.PopLong()
i := int32(l)
stack.PushInt(i)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/conversions/l2x.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 206
|
```go
package control
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Branch always
type GOTO struct{ base.BranchInstruction }
func (self *GOTO) Execute(frame *rtda.Frame) {
base.Branch(frame, self.Offset)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/control/goto.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 63
|
```go
package control
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
/*
tableswitch
<0-3 byte pad>
defaultbyte1
defaultbyte2
defaultbyte3
defaultbyte4
lowbyte1
lowbyte2
lowbyte3
lowbyte4
highbyte1
highbyte2
highbyte3
highbyte4
jump offsets...
*/
// Access jump table by index and jump
type TABLE_SWITCH struct {
defaultOffset int32
low int32
high int32
jumpOffsets []int32
}
func (self *TABLE_SWITCH) FetchOperands(reader *base.BytecodeReader) {
reader.SkipPadding()
self.defaultOffset = reader.ReadInt32()
self.low = reader.ReadInt32()
self.high = reader.ReadInt32()
jumpOffsetsCount := self.high - self.low + 1
self.jumpOffsets = reader.ReadInt32s(jumpOffsetsCount)
}
func (self *TABLE_SWITCH) Execute(frame *rtda.Frame) {
index := frame.OperandStack().PopInt()
var offset int
if index >= self.low && index <= self.high {
offset = int(self.jumpOffsets[index-self.low])
} else {
offset = int(self.defaultOffset)
}
base.Branch(frame, offset)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/control/tableswitch.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 274
|
```go
package control
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
// Return void from method
type RETURN struct{ base.NoOperandsInstruction }
func (self *RETURN) Execute(frame *rtda.Frame) {
frame.Thread().PopFrame()
}
// Return reference from method
type ARETURN struct{ base.NoOperandsInstruction }
func (self *ARETURN) Execute(frame *rtda.Frame) {
thread := frame.Thread()
currentFrame := thread.PopFrame()
invokerFrame := thread.TopFrame()
ref := currentFrame.OperandStack().PopRef()
invokerFrame.OperandStack().PushRef(ref)
}
// Return double from method
type DRETURN struct{ base.NoOperandsInstruction }
func (self *DRETURN) Execute(frame *rtda.Frame) {
thread := frame.Thread()
currentFrame := thread.PopFrame()
invokerFrame := thread.TopFrame()
val := currentFrame.OperandStack().PopDouble()
invokerFrame.OperandStack().PushDouble(val)
}
// Return float from method
type FRETURN struct{ base.NoOperandsInstruction }
func (self *FRETURN) Execute(frame *rtda.Frame) {
thread := frame.Thread()
currentFrame := thread.PopFrame()
invokerFrame := thread.TopFrame()
val := currentFrame.OperandStack().PopFloat()
invokerFrame.OperandStack().PushFloat(val)
}
// Return int from method
type IRETURN struct{ base.NoOperandsInstruction }
func (self *IRETURN) Execute(frame *rtda.Frame) {
thread := frame.Thread()
currentFrame := thread.PopFrame()
invokerFrame := thread.TopFrame()
val := currentFrame.OperandStack().PopInt()
invokerFrame.OperandStack().PushInt(val)
}
// Return double from method
type LRETURN struct{ base.NoOperandsInstruction }
func (self *LRETURN) Execute(frame *rtda.Frame) {
thread := frame.Thread()
currentFrame := thread.PopFrame()
invokerFrame := thread.TopFrame()
val := currentFrame.OperandStack().PopLong()
invokerFrame.OperandStack().PushLong(val)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/control/return.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 454
|
```go
package control
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/rtda"
/*
lookupswitch
<0-3 byte pad>
defaultbyte1
defaultbyte2
defaultbyte3
defaultbyte4
npairs1
npairs2
npairs3
npairs4
match-offset pairs...
*/
// Access jump table by key match and jump
type LOOKUP_SWITCH struct {
defaultOffset int32
npairs int32
matchOffsets []int32
}
func (self *LOOKUP_SWITCH) FetchOperands(reader *base.BytecodeReader) {
reader.SkipPadding()
self.defaultOffset = reader.ReadInt32()
self.npairs = reader.ReadInt32()
self.matchOffsets = reader.ReadInt32s(self.npairs * 2)
}
func (self *LOOKUP_SWITCH) Execute(frame *rtda.Frame) {
key := frame.OperandStack().PopInt()
for i := int32(0); i < self.npairs*2; i += 2 {
if self.matchOffsets[i] == key {
offset := self.matchOffsets[i+1]
base.Branch(frame, int(offset))
return
}
}
base.Branch(frame, int(self.defaultOffset))
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/instructions/control/lookupswitch.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 259
|
```go
package classfile
/*
field_info {
u2 access_flags;
u2 name_index;
u2 descriptor_index;
u2 attributes_count;
attribute_info attributes[attributes_count];
}
method_info {
u2 access_flags;
u2 name_index;
u2 descriptor_index;
u2 attributes_count;
attribute_info attributes[attributes_count];
}
*/
type MemberInfo struct {
cp ConstantPool
accessFlags uint16
nameIndex uint16
descriptorIndex uint16
attributes []AttributeInfo
}
// read field or method table
func readMembers(reader *ClassReader, cp ConstantPool) []*MemberInfo {
memberCount := reader.readUint16()
members := make([]*MemberInfo, memberCount)
for i := range members {
members[i] = readMember(reader, cp)
}
return members
}
func readMember(reader *ClassReader, cp ConstantPool) *MemberInfo {
return &MemberInfo{
cp: cp,
accessFlags: reader.readUint16(),
nameIndex: reader.readUint16(),
descriptorIndex: reader.readUint16(),
attributes: readAttributes(reader, cp),
}
}
func (self *MemberInfo) AccessFlags() uint16 {
return self.accessFlags
}
func (self *MemberInfo) Name() string {
return self.cp.getUtf8(self.nameIndex)
}
func (self *MemberInfo) Descriptor() string {
return self.cp.getUtf8(self.descriptorIndex)
}
func (self *MemberInfo) CodeAttribute() *CodeAttribute {
for _, attrInfo := range self.attributes {
switch attrInfo.(type) {
case *CodeAttribute:
return attrInfo.(*CodeAttribute)
}
}
return nil
}
func (self *MemberInfo) ConstantValueAttribute() *ConstantValueAttribute {
for _, attrInfo := range self.attributes {
switch attrInfo.(type) {
case *ConstantValueAttribute:
return attrInfo.(*ConstantValueAttribute)
}
}
return nil
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/member_info.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 438
|
```go
package classfile
/*
EnclosingMethod_attribute {
u2 attribute_name_index;
u4 attribute_length;
u2 class_index;
u2 method_index;
}
*/
type EnclosingMethodAttribute struct {
cp ConstantPool
classIndex uint16
methodIndex uint16
}
func (self *EnclosingMethodAttribute) readInfo(reader *ClassReader) {
self.classIndex = reader.readUint16()
self.methodIndex = reader.readUint16()
}
func (self *EnclosingMethodAttribute) ClassName() string {
return self.cp.getClassName(self.classIndex)
}
func (self *EnclosingMethodAttribute) MethodNameAndDescriptor() (string, string) {
if self.methodIndex > 0 {
return self.cp.getNameAndType(self.methodIndex)
} else {
return "", ""
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/attr_enclosing_method.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 170
|
```go
package classfile
/*
CONSTANT_MethodHandle_info {
u1 tag;
u1 reference_kind;
u2 reference_index;
}
*/
type ConstantMethodHandleInfo struct {
referenceKind uint8
referenceIndex uint16
}
func (self *ConstantMethodHandleInfo) readInfo(reader *ClassReader) {
self.referenceKind = reader.readUint8()
self.referenceIndex = reader.readUint16()
}
/*
CONSTANT_MethodType_info {
u1 tag;
u2 descriptor_index;
}
*/
type ConstantMethodTypeInfo struct {
descriptorIndex uint16
}
func (self *ConstantMethodTypeInfo) readInfo(reader *ClassReader) {
self.descriptorIndex = reader.readUint16()
}
/*
CONSTANT_InvokeDynamic_info {
u1 tag;
u2 bootstrap_method_attr_index;
u2 name_and_type_index;
}
*/
type ConstantInvokeDynamicInfo struct {
bootstrapMethodAttrIndex uint16
nameAndTypeIndex uint16
}
func (self *ConstantInvokeDynamicInfo) readInfo(reader *ClassReader) {
self.bootstrapMethodAttrIndex = reader.readUint16()
self.nameAndTypeIndex = reader.readUint16()
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/cp_invoke_dynamic.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 241
|
```go
package classfile
/*
BootstrapMethods_attribute {
u2 attribute_name_index;
u4 attribute_length;
u2 num_bootstrap_methods;
{ u2 bootstrap_method_ref;
u2 num_bootstrap_arguments;
u2 bootstrap_arguments[num_bootstrap_arguments];
} bootstrap_methods[num_bootstrap_methods];
}
*/
type BootstrapMethodsAttribute struct {
bootstrapMethods []*BootstrapMethod
}
func (self *BootstrapMethodsAttribute) readInfo(reader *ClassReader) {
numBootstrapMethods := reader.readUint16()
self.bootstrapMethods = make([]*BootstrapMethod, numBootstrapMethods)
for i := range self.bootstrapMethods {
self.bootstrapMethods[i] = &BootstrapMethod{
bootstrapMethodRef: reader.readUint16(),
bootstrapArguments: reader.readUint16s(),
}
}
}
type BootstrapMethod struct {
bootstrapMethodRef uint16
bootstrapArguments []uint16
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/attr_bootstrap_methods.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 184
|
```go
package classfile
import "fmt"
type ConstantPool []ConstantInfo
func readConstantPool(reader *ClassReader) ConstantPool {
cpCount := int(reader.readUint16())
cp := make([]ConstantInfo, cpCount)
// The constant_pool table is indexed from 1 to constant_pool_count - 1.
for i := 1; i < cpCount; i++ {
cp[i] = readConstantInfo(reader, cp)
// path_to_url#jvms-4.4.5
// All 8-byte constants take up two entries in the constant_pool table of the class file.
// If a CONSTANT_Long_info or CONSTANT_Double_info structure is the item in the constant_pool
// table at index n, then the next usable item in the pool is located at index n+2.
// The constant_pool index n+1 must be valid but is considered unusable.
switch cp[i].(type) {
case *ConstantLongInfo, *ConstantDoubleInfo:
i++
}
}
return cp
}
func (self ConstantPool) getConstantInfo(index uint16) ConstantInfo {
if cpInfo := self[index]; cpInfo != nil {
return cpInfo
}
panic(fmt.Errorf("Invalid constant pool index: %v!", index))
}
func (self ConstantPool) getNameAndType(index uint16) (string, string) {
ntInfo := self.getConstantInfo(index).(*ConstantNameAndTypeInfo)
name := self.getUtf8(ntInfo.nameIndex)
_type := self.getUtf8(ntInfo.descriptorIndex)
return name, _type
}
func (self ConstantPool) getClassName(index uint16) string {
classInfo := self.getConstantInfo(index).(*ConstantClassInfo)
return self.getUtf8(classInfo.nameIndex)
}
func (self ConstantPool) getUtf8(index uint16) string {
utf8Info := self.getConstantInfo(index).(*ConstantUtf8Info)
return utf8Info.str
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/constant_pool.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 421
|
```go
package classfile
/*
Exceptions_attribute {
u2 attribute_name_index;
u4 attribute_length;
u2 number_of_exceptions;
u2 exception_index_table[number_of_exceptions];
}
*/
type ExceptionsAttribute struct {
exceptionIndexTable []uint16
}
func (self *ExceptionsAttribute) readInfo(reader *ClassReader) {
self.exceptionIndexTable = reader.readUint16s()
}
func (self *ExceptionsAttribute) ExceptionIndexTable() []uint16 {
return self.exceptionIndexTable
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/attr_exceptions.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 104
|
```go
package classfile
/*
CONSTANT_NameAndType_info {
u1 tag;
u2 name_index;
u2 descriptor_index;
}
*/
type ConstantNameAndTypeInfo struct {
nameIndex uint16
descriptorIndex uint16
}
func (self *ConstantNameAndTypeInfo) readInfo(reader *ClassReader) {
self.nameIndex = reader.readUint16()
self.descriptorIndex = reader.readUint16()
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/cp_name_and_type.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 88
|
```go
package classfile
/*
LineNumberTable_attribute {
u2 attribute_name_index;
u4 attribute_length;
u2 line_number_table_length;
{ u2 start_pc;
u2 line_number;
} line_number_table[line_number_table_length];
}
*/
type LineNumberTableAttribute struct {
lineNumberTable []*LineNumberTableEntry
}
type LineNumberTableEntry struct {
startPc uint16
lineNumber uint16
}
func (self *LineNumberTableAttribute) readInfo(reader *ClassReader) {
lineNumberTableLength := reader.readUint16()
self.lineNumberTable = make([]*LineNumberTableEntry, lineNumberTableLength)
for i := range self.lineNumberTable {
self.lineNumberTable[i] = &LineNumberTableEntry{
startPc: reader.readUint16(),
lineNumber: reader.readUint16(),
}
}
}
func (self *LineNumberTableAttribute) GetLineNumber(pc int) int {
for i := len(self.lineNumberTable) - 1; i >= 0; i-- {
entry := self.lineNumberTable[i]
if pc >= int(entry.startPc) {
return int(entry.lineNumber)
}
}
return -1
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/attr_line_number_table.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 255
|
```go
package classfile
/*
Deprecated_attribute {
u2 attribute_name_index;
u4 attribute_length;
}
*/
type DeprecatedAttribute struct {
MarkerAttribute
}
/*
Synthetic_attribute {
u2 attribute_name_index;
u4 attribute_length;
}
*/
type SyntheticAttribute struct {
MarkerAttribute
}
type MarkerAttribute struct{}
func (self *MarkerAttribute) readInfo(reader *ClassReader) {
// read nothing
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/attr_markers.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 90
|
```go
package classfile
/*
attribute_info {
u2 attribute_name_index;
u4 attribute_length;
u1 info[attribute_length];
}
*/
type UnparsedAttribute struct {
name string
length uint32
info []byte
}
func (self *UnparsedAttribute) readInfo(reader *ClassReader) {
self.info = reader.readBytes(self.length)
}
func (self *UnparsedAttribute) Info() []byte {
return self.info
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/attr_unparsed.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 96
|
```go
package classfile
/*
CONSTANT_Class_info {
u1 tag;
u2 name_index;
}
*/
type ConstantClassInfo struct {
cp ConstantPool
nameIndex uint16
}
func (self *ConstantClassInfo) readInfo(reader *ClassReader) {
self.nameIndex = reader.readUint16()
}
func (self *ConstantClassInfo) Name() string {
return self.cp.getUtf8(self.nameIndex)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/cp_class.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 90
|
```go
package classfile
// Constant pool tags
const (
CONSTANT_Class = 7
CONSTANT_Fieldref = 9
CONSTANT_Methodref = 10
CONSTANT_InterfaceMethodref = 11
CONSTANT_String = 8
CONSTANT_Integer = 3
CONSTANT_Float = 4
CONSTANT_Long = 5
CONSTANT_Double = 6
CONSTANT_NameAndType = 12
CONSTANT_Utf8 = 1
CONSTANT_MethodHandle = 15
CONSTANT_MethodType = 16
CONSTANT_InvokeDynamic = 18
)
/*
cp_info {
u1 tag;
u1 info[];
}
*/
type ConstantInfo interface {
readInfo(reader *ClassReader)
}
func readConstantInfo(reader *ClassReader, cp ConstantPool) ConstantInfo {
tag := reader.readUint8()
c := newConstantInfo(tag, cp)
c.readInfo(reader)
return c
}
// todo ugly code
func newConstantInfo(tag uint8, cp ConstantPool) ConstantInfo {
switch tag {
case CONSTANT_Integer:
return &ConstantIntegerInfo{}
case CONSTANT_Float:
return &ConstantFloatInfo{}
case CONSTANT_Long:
return &ConstantLongInfo{}
case CONSTANT_Double:
return &ConstantDoubleInfo{}
case CONSTANT_Utf8:
return &ConstantUtf8Info{}
case CONSTANT_String:
return &ConstantStringInfo{cp: cp}
case CONSTANT_Class:
return &ConstantClassInfo{cp: cp}
case CONSTANT_Fieldref:
return &ConstantFieldrefInfo{ConstantMemberrefInfo{cp: cp}}
case CONSTANT_Methodref:
return &ConstantMethodrefInfo{ConstantMemberrefInfo{cp: cp}}
case CONSTANT_InterfaceMethodref:
return &ConstantInterfaceMethodrefInfo{ConstantMemberrefInfo{cp: cp}}
case CONSTANT_NameAndType:
return &ConstantNameAndTypeInfo{}
case CONSTANT_MethodType:
return &ConstantMethodTypeInfo{}
case CONSTANT_MethodHandle:
return &ConstantMethodHandleInfo{}
case CONSTANT_InvokeDynamic:
return &ConstantInvokeDynamicInfo{}
default:
panic("java.lang.ClassFormatError: constant pool tag!")
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/constant_info.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 468
|
```go
package classfile
import "math"
/*
CONSTANT_Integer_info {
u1 tag;
u4 bytes;
}
*/
type ConstantIntegerInfo struct {
val int32
}
func (self *ConstantIntegerInfo) readInfo(reader *ClassReader) {
bytes := reader.readUint32()
self.val = int32(bytes)
}
func (self *ConstantIntegerInfo) Value() int32 {
return self.val
}
/*
CONSTANT_Float_info {
u1 tag;
u4 bytes;
}
*/
type ConstantFloatInfo struct {
val float32
}
func (self *ConstantFloatInfo) readInfo(reader *ClassReader) {
bytes := reader.readUint32()
self.val = math.Float32frombits(bytes)
}
func (self *ConstantFloatInfo) Value() float32 {
return self.val
}
/*
CONSTANT_Long_info {
u1 tag;
u4 high_bytes;
u4 low_bytes;
}
*/
type ConstantLongInfo struct {
val int64
}
func (self *ConstantLongInfo) readInfo(reader *ClassReader) {
bytes := reader.readUint64()
self.val = int64(bytes)
}
func (self *ConstantLongInfo) Value() int64 {
return self.val
}
/*
CONSTANT_Double_info {
u1 tag;
u4 high_bytes;
u4 low_bytes;
}
*/
type ConstantDoubleInfo struct {
val float64
}
func (self *ConstantDoubleInfo) readInfo(reader *ClassReader) {
bytes := reader.readUint64()
self.val = math.Float64frombits(bytes)
}
func (self *ConstantDoubleInfo) Value() float64 {
return self.val
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/cp_numeric.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 341
|
```go
package classfile
/*
SourceFile_attribute {
u2 attribute_name_index;
u4 attribute_length;
u2 sourcefile_index;
}
*/
type SourceFileAttribute struct {
cp ConstantPool
sourceFileIndex uint16
}
func (self *SourceFileAttribute) readInfo(reader *ClassReader) {
self.sourceFileIndex = reader.readUint16()
}
func (self *SourceFileAttribute) FileName() string {
return self.cp.getUtf8(self.sourceFileIndex)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/attr_source_file.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 101
|
```go
package classfile
import "fmt"
/*
ClassFile {
u4 magic;
u2 minor_version;
u2 major_version;
u2 constant_pool_count;
cp_info constant_pool[constant_pool_count-1];
u2 access_flags;
u2 this_class;
u2 super_class;
u2 interfaces_count;
u2 interfaces[interfaces_count];
u2 fields_count;
field_info fields[fields_count];
u2 methods_count;
method_info methods[methods_count];
u2 attributes_count;
attribute_info attributes[attributes_count];
}
*/
type ClassFile struct {
//magic uint32
minorVersion uint16
majorVersion uint16
constantPool ConstantPool
accessFlags uint16
thisClass uint16
superClass uint16
interfaces []uint16
fields []*MemberInfo
methods []*MemberInfo
attributes []AttributeInfo
}
func Parse(classData []byte) (cf *ClassFile, err error) {
defer func() {
if r := recover(); r != nil {
var ok bool
err, ok = r.(error)
if !ok {
err = fmt.Errorf("%v", r)
}
}
}()
cr := &ClassReader{classData}
cf = &ClassFile{}
cf.read(cr)
return
}
func (self *ClassFile) read(reader *ClassReader) {
self.readAndCheckMagic(reader)
self.readAndCheckVersion(reader)
self.constantPool = readConstantPool(reader)
self.accessFlags = reader.readUint16()
self.thisClass = reader.readUint16()
self.superClass = reader.readUint16()
self.interfaces = reader.readUint16s()
self.fields = readMembers(reader, self.constantPool)
self.methods = readMembers(reader, self.constantPool)
self.attributes = readAttributes(reader, self.constantPool)
}
func (self *ClassFile) readAndCheckMagic(reader *ClassReader) {
magic := reader.readUint32()
if magic != 0xCAFEBABE {
panic("java.lang.ClassFormatError: magic!")
}
}
func (self *ClassFile) readAndCheckVersion(reader *ClassReader) {
self.minorVersion = reader.readUint16()
self.majorVersion = reader.readUint16()
switch self.majorVersion {
case 45:
return
case 46, 47, 48, 49, 50, 51, 52:
if self.minorVersion == 0 {
return
}
}
panic("java.lang.UnsupportedClassVersionError!")
}
func (self *ClassFile) MinorVersion() uint16 {
return self.minorVersion
}
func (self *ClassFile) MajorVersion() uint16 {
return self.majorVersion
}
func (self *ClassFile) ConstantPool() ConstantPool {
return self.constantPool
}
func (self *ClassFile) AccessFlags() uint16 {
return self.accessFlags
}
func (self *ClassFile) Fields() []*MemberInfo {
return self.fields
}
func (self *ClassFile) Methods() []*MemberInfo {
return self.methods
}
func (self *ClassFile) ClassName() string {
return self.constantPool.getClassName(self.thisClass)
}
func (self *ClassFile) SuperClassName() string {
if self.superClass > 0 {
return self.constantPool.getClassName(self.superClass)
}
return ""
}
func (self *ClassFile) InterfaceNames() []string {
interfaceNames := make([]string, len(self.interfaces))
for i, cpIndex := range self.interfaces {
interfaceNames[i] = self.constantPool.getClassName(cpIndex)
}
return interfaceNames
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/class_file.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 787
|
```go
package classfile
/*
ConstantValue_attribute {
u2 attribute_name_index;
u4 attribute_length;
u2 constantvalue_index;
}
*/
type ConstantValueAttribute struct {
constantValueIndex uint16
}
func (self *ConstantValueAttribute) readInfo(reader *ClassReader) {
self.constantValueIndex = reader.readUint16()
}
func (self *ConstantValueAttribute) ConstantValueIndex() uint16 {
return self.constantValueIndex
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/attr_constant_value.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 95
|
```go
package classfile
/*
LocalVariableTable_attribute {
u2 attribute_name_index;
u4 attribute_length;
u2 local_variable_table_length;
{ u2 start_pc;
u2 length;
u2 name_index;
u2 descriptor_index;
u2 index;
} local_variable_table[local_variable_table_length];
}
*/
type LocalVariableTableAttribute struct {
localVariableTable []*LocalVariableTableEntry
}
type LocalVariableTableEntry struct {
startPc uint16
length uint16
nameIndex uint16
descriptorIndex uint16
index uint16
}
func (self *LocalVariableTableAttribute) readInfo(reader *ClassReader) {
localVariableTableLength := reader.readUint16()
self.localVariableTable = make([]*LocalVariableTableEntry, localVariableTableLength)
for i := range self.localVariableTable {
self.localVariableTable[i] = &LocalVariableTableEntry{
startPc: reader.readUint16(),
length: reader.readUint16(),
nameIndex: reader.readUint16(),
descriptorIndex: reader.readUint16(),
index: reader.readUint16(),
}
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/attr_local_variable_table.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 251
|
```go
package classfile
import "encoding/binary"
type ClassReader struct {
data []byte
}
// u1
func (self *ClassReader) readUint8() uint8 {
val := self.data[0]
self.data = self.data[1:]
return val
}
// u2
func (self *ClassReader) readUint16() uint16 {
val := binary.BigEndian.Uint16(self.data)
self.data = self.data[2:]
return val
}
// u4
func (self *ClassReader) readUint32() uint32 {
val := binary.BigEndian.Uint32(self.data)
self.data = self.data[4:]
return val
}
func (self *ClassReader) readUint64() uint64 {
val := binary.BigEndian.Uint64(self.data)
self.data = self.data[8:]
return val
}
func (self *ClassReader) readUint16s() []uint16 {
n := self.readUint16()
s := make([]uint16, n)
for i := range s {
s[i] = self.readUint16()
}
return s
}
func (self *ClassReader) readBytes(n uint32) []byte {
bytes := self.data[:n]
self.data = self.data[n:]
return bytes
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/class_reader.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 262
|
```go
package classfile
/*
InnerClasses_attribute {
u2 attribute_name_index;
u4 attribute_length;
u2 number_of_classes;
{ u2 inner_class_info_index;
u2 outer_class_info_index;
u2 inner_name_index;
u2 inner_class_access_flags;
} classes[number_of_classes];
}
*/
type InnerClassesAttribute struct {
classes []*InnerClassInfo
}
type InnerClassInfo struct {
innerClassInfoIndex uint16
outerClassInfoIndex uint16
innerNameIndex uint16
innerClassAccessFlags uint16
}
func (self *InnerClassesAttribute) readInfo(reader *ClassReader) {
numberOfClasses := reader.readUint16()
self.classes = make([]*InnerClassInfo, numberOfClasses)
for i := range self.classes {
self.classes[i] = &InnerClassInfo{
innerClassInfoIndex: reader.readUint16(),
outerClassInfoIndex: reader.readUint16(),
innerNameIndex: reader.readUint16(),
innerClassAccessFlags: reader.readUint16(),
}
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/attr_inner_classes.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 238
|
```go
package classfile
/*
Signature_attribute {
u2 attribute_name_index;
u4 attribute_length;
u2 signature_index;
}
*/
type SignatureAttribute struct {
cp ConstantPool
signatureIndex uint16
}
func (self *SignatureAttribute) readInfo(reader *ClassReader) {
self.signatureIndex = reader.readUint16()
}
func (self *SignatureAttribute) Signature() string {
return self.cp.getUtf8(self.signatureIndex)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/attr_signature.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 94
|
```go
package classfile
import "fmt"
import "unicode/utf16"
/*
CONSTANT_Utf8_info {
u1 tag;
u2 length;
u1 bytes[length];
}
*/
type ConstantUtf8Info struct {
str string
}
func (self *ConstantUtf8Info) readInfo(reader *ClassReader) {
length := uint32(reader.readUint16())
bytes := reader.readBytes(length)
self.str = decodeMUTF8(bytes)
}
func (self *ConstantUtf8Info) Str() string {
return self.str
}
/*
func decodeMUTF8(bytes []byte) string {
return string(bytes) // not correct!
}
*/
// mutf8 -> utf16 -> utf32 -> string
// see java.io.DataInputStream.readUTF(DataInput)
func decodeMUTF8(bytearr []byte) string {
utflen := len(bytearr)
chararr := make([]uint16, utflen)
var c, char2, char3 uint16
count := 0
chararr_count := 0
for count < utflen {
c = uint16(bytearr[count])
if c > 127 {
break
}
count++
chararr[chararr_count] = c
chararr_count++
}
for count < utflen {
c = uint16(bytearr[count])
switch c >> 4 {
case 0, 1, 2, 3, 4, 5, 6, 7:
/* 0xxxxxxx*/
count++
chararr[chararr_count] = c
chararr_count++
case 12, 13:
/* 110x xxxx 10xx xxxx*/
count += 2
if count > utflen {
panic("malformed input: partial character at end")
}
char2 = uint16(bytearr[count-1])
if char2&0xC0 != 0x80 {
panic(fmt.Errorf("malformed input around byte %v", count))
}
chararr[chararr_count] = c&0x1F<<6 | char2&0x3F
chararr_count++
case 14:
/* 1110 xxxx 10xx xxxx 10xx xxxx*/
count += 3
if count > utflen {
panic("malformed input: partial character at end")
}
char2 = uint16(bytearr[count-2])
char3 = uint16(bytearr[count-1])
if char2&0xC0 != 0x80 || char3&0xC0 != 0x80 {
panic(fmt.Errorf("malformed input around byte %v", (count - 1)))
}
chararr[chararr_count] = c&0x0F<<12 | char2&0x3F<<6 | char3&0x3F<<0
chararr_count++
default:
/* 10xx xxxx, 1111 xxxx */
panic(fmt.Errorf("malformed input around byte %v", count))
}
}
// The number of chars produced may be less than utflen
chararr = chararr[0:chararr_count]
runes := utf16.Decode(chararr)
return string(runes)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/cp_utf8.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 702
|
```go
package classfile
/*
Code_attribute {
u2 attribute_name_index;
u4 attribute_length;
u2 max_stack;
u2 max_locals;
u4 code_length;
u1 code[code_length];
u2 exception_table_length;
{ u2 start_pc;
u2 end_pc;
u2 handler_pc;
u2 catch_type;
} exception_table[exception_table_length];
u2 attributes_count;
attribute_info attributes[attributes_count];
}
*/
type CodeAttribute struct {
cp ConstantPool
maxStack uint16
maxLocals uint16
code []byte
exceptionTable []*ExceptionTableEntry
attributes []AttributeInfo
}
func (self *CodeAttribute) readInfo(reader *ClassReader) {
self.maxStack = reader.readUint16()
self.maxLocals = reader.readUint16()
codeLength := reader.readUint32()
self.code = reader.readBytes(codeLength)
self.exceptionTable = readExceptionTable(reader)
self.attributes = readAttributes(reader, self.cp)
}
func (self *CodeAttribute) MaxStack() uint {
return uint(self.maxStack)
}
func (self *CodeAttribute) MaxLocals() uint {
return uint(self.maxLocals)
}
func (self *CodeAttribute) Code() []byte {
return self.code
}
func (self *CodeAttribute) ExceptionTable() []*ExceptionTableEntry {
return self.exceptionTable
}
type ExceptionTableEntry struct {
startPc uint16
endPc uint16
handlerPc uint16
catchType uint16
}
func readExceptionTable(reader *ClassReader) []*ExceptionTableEntry {
exceptionTableLength := reader.readUint16()
exceptionTable := make([]*ExceptionTableEntry, exceptionTableLength)
for i := range exceptionTable {
exceptionTable[i] = &ExceptionTableEntry{
startPc: reader.readUint16(),
endPc: reader.readUint16(),
handlerPc: reader.readUint16(),
catchType: reader.readUint16(),
}
}
return exceptionTable
}
func (self *ExceptionTableEntry) StartPc() uint16 {
return self.startPc
}
func (self *ExceptionTableEntry) EndPc() uint16 {
return self.endPc
}
func (self *ExceptionTableEntry) HandlerPc() uint16 {
return self.handlerPc
}
func (self *ExceptionTableEntry) CatchType() uint16 {
return self.catchType
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/attr_code.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 524
|
```go
package classfile
/*
CONSTANT_Fieldref_info {
u1 tag;
u2 class_index;
u2 name_and_type_index;
}
CONSTANT_Methodref_info {
u1 tag;
u2 class_index;
u2 name_and_type_index;
}
CONSTANT_InterfaceMethodref_info {
u1 tag;
u2 class_index;
u2 name_and_type_index;
}
*/
type ConstantFieldrefInfo struct{ ConstantMemberrefInfo }
type ConstantMethodrefInfo struct{ ConstantMemberrefInfo }
type ConstantInterfaceMethodrefInfo struct{ ConstantMemberrefInfo }
type ConstantMemberrefInfo struct {
cp ConstantPool
classIndex uint16
nameAndTypeIndex uint16
}
func (self *ConstantMemberrefInfo) readInfo(reader *ClassReader) {
self.classIndex = reader.readUint16()
self.nameAndTypeIndex = reader.readUint16()
}
func (self *ConstantMemberrefInfo) ClassName() string {
return self.cp.getClassName(self.classIndex)
}
func (self *ConstantMemberrefInfo) NameAndDescriptor() (string, string) {
return self.cp.getNameAndType(self.nameAndTypeIndex)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/cp_member_ref.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 241
|
```go
package classfile
/*
CONSTANT_String_info {
u1 tag;
u2 string_index;
}
*/
type ConstantStringInfo struct {
cp ConstantPool
stringIndex uint16
}
func (self *ConstantStringInfo) readInfo(reader *ClassReader) {
self.stringIndex = reader.readUint16()
}
func (self *ConstantStringInfo) String() string {
return self.cp.getUtf8(self.stringIndex)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/cp_string.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 90
|
```go
package classfile
var (
_attrDeprecated = &DeprecatedAttribute{}
_attrSynthetic = &SyntheticAttribute{}
)
/*
attribute_info {
u2 attribute_name_index;
u4 attribute_length;
u1 info[attribute_length];
}
*/
type AttributeInfo interface {
readInfo(reader *ClassReader)
}
func readAttributes(reader *ClassReader, cp ConstantPool) []AttributeInfo {
attributesCount := reader.readUint16()
attributes := make([]AttributeInfo, attributesCount)
for i := range attributes {
attributes[i] = readAttribute(reader, cp)
}
return attributes
}
func readAttribute(reader *ClassReader, cp ConstantPool) AttributeInfo {
attrNameIndex := reader.readUint16()
attrName := cp.getUtf8(attrNameIndex)
attrLen := reader.readUint32()
attrInfo := newAttributeInfo(attrName, attrLen, cp)
attrInfo.readInfo(reader)
return attrInfo
}
func newAttributeInfo(attrName string, attrLen uint32, cp ConstantPool) AttributeInfo {
switch attrName {
// case "AnnotationDefault":
case "BootstrapMethods":
return &BootstrapMethodsAttribute{}
case "Code":
return &CodeAttribute{cp: cp}
case "ConstantValue":
return &ConstantValueAttribute{}
case "Deprecated":
return _attrDeprecated
case "EnclosingMethod":
return &EnclosingMethodAttribute{cp: cp}
case "Exceptions":
return &ExceptionsAttribute{}
case "InnerClasses":
return &InnerClassesAttribute{}
case "LineNumberTable":
return &LineNumberTableAttribute{}
case "LocalVariableTable":
return &LocalVariableTableAttribute{}
case "LocalVariableTypeTable":
return &LocalVariableTypeTableAttribute{}
// case "MethodParameters":
// case "RuntimeInvisibleAnnotations":
// case "RuntimeInvisibleParameterAnnotations":
// case "RuntimeInvisibleTypeAnnotations":
// case "RuntimeVisibleAnnotations":
// case "RuntimeVisibleParameterAnnotations":
// case "RuntimeVisibleTypeAnnotations":
case "Signature":
return &SignatureAttribute{cp: cp}
case "SourceFile":
return &SourceFileAttribute{cp: cp}
// case "SourceDebugExtension":
// case "StackMapTable":
case "Synthetic":
return _attrSynthetic
default:
return &UnparsedAttribute{attrName, attrLen, nil}
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/attribute_info.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 496
|
```go
package native
import "jvmgo/ch09/rtda"
type NativeMethod func(frame *rtda.Frame)
var registry = map[string]NativeMethod{}
func emptyNativeMethod(frame *rtda.Frame) {
// do nothing
}
func Register(className, methodName, methodDescriptor string, method NativeMethod) {
key := className + "~" + methodName + "~" + methodDescriptor
registry[key] = method
}
func FindNativeMethod(className, methodName, methodDescriptor string) NativeMethod {
key := className + "~" + methodName + "~" + methodDescriptor
if method, ok := registry[key]; ok {
return method
}
if methodDescriptor == "()V" && methodName == "registerNatives" {
return emptyNativeMethod
}
return nil
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/native/registry.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 165
|
```go
package classfile
/*
LocalVariableTypeTable_attribute {
u2 attribute_name_index;
u4 attribute_length;
u2 local_variable_type_table_length;
{ u2 start_pc;
u2 length;
u2 name_index;
u2 signature_index;
u2 index;
} local_variable_type_table[local_variable_type_table_length];
}
*/
type LocalVariableTypeTableAttribute struct {
localVariableTypeTable []*LocalVariableTypeTableEntry
}
type LocalVariableTypeTableEntry struct {
startPc uint16
length uint16
nameIndex uint16
signatureIndex uint16
index uint16
}
func (self *LocalVariableTypeTableAttribute) readInfo(reader *ClassReader) {
localVariableTypeTableLength := reader.readUint16()
self.localVariableTypeTable = make([]*LocalVariableTypeTableEntry, localVariableTypeTableLength)
for i := range self.localVariableTypeTable {
self.localVariableTypeTable[i] = &LocalVariableTypeTableEntry{
startPc: reader.readUint16(),
length: reader.readUint16(),
nameIndex: reader.readUint16(),
signatureIndex: reader.readUint16(),
index: reader.readUint16(),
}
}
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/classfile/attr_local_variable_type_table.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 267
|
```go
package lang
import "jvmgo/ch09/native"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/rtda/heap"
const jlString = "java/lang/String"
func init() {
native.Register(jlString, "intern", "()Ljava/lang/String;", intern)
}
// public native String intern();
// ()Ljava/lang/String;
func intern(frame *rtda.Frame) {
this := frame.LocalVars().GetThis()
interned := heap.InternString(this)
frame.OperandStack().PushRef(interned)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/native/java/lang/String.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 121
|
```go
package lang
import "unsafe"
import "jvmgo/ch09/native"
import "jvmgo/ch09/rtda"
const jlObject = "java/lang/Object"
func init() {
native.Register(jlObject, "getClass", "()Ljava/lang/Class;", getClass)
native.Register(jlObject, "hashCode", "()I", hashCode)
native.Register(jlObject, "clone", "()Ljava/lang/Object;", clone)
}
// public final native Class<?> getClass();
// ()Ljava/lang/Class;
func getClass(frame *rtda.Frame) {
this := frame.LocalVars().GetThis()
class := this.Class().JClass()
frame.OperandStack().PushRef(class)
}
// public native int hashCode();
// ()I
func hashCode(frame *rtda.Frame) {
this := frame.LocalVars().GetThis()
hash := int32(uintptr(unsafe.Pointer(this)))
frame.OperandStack().PushInt(hash)
}
// protected native Object clone() throws CloneNotSupportedException;
// ()Ljava/lang/Object;
func clone(frame *rtda.Frame) {
this := frame.LocalVars().GetThis()
cloneable := this.Class().Loader().LoadClass("java/lang/Cloneable")
if !this.Class().IsImplements(cloneable) {
panic("java.lang.CloneNotSupportedException")
}
frame.OperandStack().PushRef(this.Clone())
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/native/java/lang/Object.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 280
|
```go
package lang
import "jvmgo/ch09/native"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/rtda/heap"
const jlSystem = "java/lang/System"
func init() {
native.Register(jlSystem, "arraycopy", "(Ljava/lang/Object;ILjava/lang/Object;II)V", arraycopy)
}
// public static native void arraycopy(Object src, int srcPos, Object dest, int destPos, int length)
// (Ljava/lang/Object;ILjava/lang/Object;II)V
func arraycopy(frame *rtda.Frame) {
vars := frame.LocalVars()
src := vars.GetRef(0)
srcPos := vars.GetInt(1)
dest := vars.GetRef(2)
destPos := vars.GetInt(3)
length := vars.GetInt(4)
if src == nil || dest == nil {
panic("java.lang.NullPointerException")
}
if !checkArrayCopy(src, dest) {
panic("java.lang.ArrayStoreException")
}
if srcPos < 0 || destPos < 0 || length < 0 ||
srcPos+length > src.ArrayLength() ||
destPos+length > dest.ArrayLength() {
panic("java.lang.IndexOutOfBoundsException")
}
heap.ArrayCopy(src, dest, srcPos, destPos, length)
}
func checkArrayCopy(src, dest *heap.Object) bool {
srcClass := src.Class()
destClass := dest.Class()
if !srcClass.IsArray() || !destClass.IsArray() {
return false
}
if srcClass.ComponentClass().IsPrimitive() ||
destClass.ComponentClass().IsPrimitive() {
return srcClass == destClass
}
return true
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/native/java/lang/System.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 360
|
```go
package lang
import "math"
import "jvmgo/ch09/native"
import "jvmgo/ch09/rtda"
const jlFloat = "java/lang/Float"
func init() {
native.Register(jlFloat, "floatToRawIntBits", "(F)I", floatToRawIntBits)
native.Register(jlFloat, "intBitsToFloat", "(I)F", intBitsToFloat)
}
// public static native int floatToRawIntBits(float value);
// (F)I
func floatToRawIntBits(frame *rtda.Frame) {
value := frame.LocalVars().GetFloat(0)
bits := math.Float32bits(value) // todo
frame.OperandStack().PushInt(int32(bits))
}
// public static native float intBitsToFloat(int bits);
// (I)F
func intBitsToFloat(frame *rtda.Frame) {
bits := frame.LocalVars().GetInt(0)
value := math.Float32frombits(uint32(bits)) // todo
frame.OperandStack().PushFloat(value)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/native/java/lang/Float.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 225
|
```go
package lang
import "math"
import "jvmgo/ch09/native"
import "jvmgo/ch09/rtda"
const jlDouble = "java/lang/Double"
func init() {
native.Register(jlDouble, "doubleToRawLongBits", "(D)J", doubleToRawLongBits)
native.Register(jlDouble, "longBitsToDouble", "(J)D", longBitsToDouble)
}
// public static native long doubleToRawLongBits(double value);
// (D)J
func doubleToRawLongBits(frame *rtda.Frame) {
value := frame.LocalVars().GetDouble(0)
bits := math.Float64bits(value) // todo
frame.OperandStack().PushLong(int64(bits))
}
// public static native double longBitsToDouble(long bits);
// (J)D
func longBitsToDouble(frame *rtda.Frame) {
bits := frame.LocalVars().GetLong(0)
value := math.Float64frombits(uint64(bits)) // todo
frame.OperandStack().PushDouble(value)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/native/java/lang/Double.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 226
|
```go
package misc
import "jvmgo/ch09/instructions/base"
import "jvmgo/ch09/native"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/rtda/heap"
func init() {
native.Register("sun/misc/VM", "initialize", "()V", initialize)
}
// private static native void initialize();
// ()V
func initialize(frame *rtda.Frame) { // hack: just make VM.savedProps nonempty
vmClass := frame.Method().Class()
savedProps := vmClass.GetRefVar("savedProps", "Ljava/util/Properties;")
key := heap.JString(vmClass.Loader(), "foo")
val := heap.JString(vmClass.Loader(), "bar")
frame.OperandStack().PushRef(savedProps)
frame.OperandStack().PushRef(key)
frame.OperandStack().PushRef(val)
propsClass := vmClass.Loader().LoadClass("java/util/Properties")
setPropMethod := propsClass.GetInstanceMethod("setProperty",
"(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/Object;")
base.InvokeMethod(frame, setPropMethod)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/native/sun/misc/VM.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 232
|
```go
package lang
import "jvmgo/ch09/native"
import "jvmgo/ch09/rtda"
import "jvmgo/ch09/rtda/heap"
const jlClass = "java/lang/Class"
func init() {
native.Register(jlClass, "getPrimitiveClass", "(Ljava/lang/String;)Ljava/lang/Class;", getPrimitiveClass)
native.Register(jlClass, "getName0", "()Ljava/lang/String;", getName0)
native.Register(jlClass, "desiredAssertionStatus0", "(Ljava/lang/Class;)Z", desiredAssertionStatus0)
//native.Register(jlClass, "isInterface", "()Z", isInterface)
//native.Register(jlClass, "isPrimitive", "()Z", isPrimitive)
}
// static native Class<?> getPrimitiveClass(String name);
// (Ljava/lang/String;)Ljava/lang/Class;
func getPrimitiveClass(frame *rtda.Frame) {
nameObj := frame.LocalVars().GetRef(0)
name := heap.GoString(nameObj)
loader := frame.Method().Class().Loader()
class := loader.LoadClass(name).JClass()
frame.OperandStack().PushRef(class)
}
// private native String getName0();
// ()Ljava/lang/String;
func getName0(frame *rtda.Frame) {
this := frame.LocalVars().GetThis()
class := this.Extra().(*heap.Class)
name := class.JavaName()
nameObj := heap.JString(class.Loader(), name)
frame.OperandStack().PushRef(nameObj)
}
// private static native boolean desiredAssertionStatus0(Class<?> clazz);
// (Ljava/lang/Class;)Z
func desiredAssertionStatus0(frame *rtda.Frame) {
// todo
frame.OperandStack().PushBoolean(false)
}
// public native boolean isInterface();
// ()Z
func isInterface(frame *rtda.Frame) {
vars := frame.LocalVars()
this := vars.GetThis()
class := this.Extra().(*heap.Class)
stack := frame.OperandStack()
stack.PushBoolean(class.IsInterface())
}
// public native boolean isPrimitive();
// ()Z
func isPrimitive(frame *rtda.Frame) {
vars := frame.LocalVars()
this := vars.GetThis()
class := this.Extra().(*heap.Class)
stack := frame.OperandStack()
stack.PushBoolean(class.IsPrimitive())
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/native/java/lang/Class.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 483
|
```go
package rtda
import "jvmgo/ch09/rtda/heap"
/*
JVM
Thread
pc
Stack
Frame
LocalVars
OperandStack
*/
type Thread struct {
pc int // the address of the instruction currently being executed
stack *Stack
// todo
}
func NewThread() *Thread {
return &Thread{
stack: newStack(1024),
}
}
func (self *Thread) PC() int {
return self.pc
}
func (self *Thread) SetPC(pc int) {
self.pc = pc
}
func (self *Thread) PushFrame(frame *Frame) {
self.stack.push(frame)
}
func (self *Thread) PopFrame() *Frame {
return self.stack.pop()
}
func (self *Thread) CurrentFrame() *Frame {
return self.stack.top()
}
func (self *Thread) TopFrame() *Frame {
return self.stack.top()
}
func (self *Thread) IsStackEmpty() bool {
return self.stack.isEmpty()
}
func (self *Thread) NewFrame(method *heap.Method) *Frame {
return newFrame(self, method)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/thread.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 241
|
```go
package rtda
import "math"
import "jvmgo/ch09/rtda/heap"
type OperandStack struct {
size uint
slots []Slot
}
func newOperandStack(maxStack uint) *OperandStack {
if maxStack > 0 {
return &OperandStack{
slots: make([]Slot, maxStack),
}
}
return nil
}
func (self *OperandStack) PushInt(val int32) {
self.slots[self.size].num = val
self.size++
}
func (self *OperandStack) PopInt() int32 {
self.size--
return self.slots[self.size].num
}
func (self *OperandStack) PushFloat(val float32) {
bits := math.Float32bits(val)
self.slots[self.size].num = int32(bits)
self.size++
}
func (self *OperandStack) PopFloat() float32 {
self.size--
bits := uint32(self.slots[self.size].num)
return math.Float32frombits(bits)
}
// long consumes two slots
func (self *OperandStack) PushLong(val int64) {
self.slots[self.size].num = int32(val)
self.slots[self.size+1].num = int32(val >> 32)
self.size += 2
}
func (self *OperandStack) PopLong() int64 {
self.size -= 2
low := uint32(self.slots[self.size].num)
high := uint32(self.slots[self.size+1].num)
return int64(high)<<32 | int64(low)
}
// double consumes two slots
func (self *OperandStack) PushDouble(val float64) {
bits := math.Float64bits(val)
self.PushLong(int64(bits))
}
func (self *OperandStack) PopDouble() float64 {
bits := uint64(self.PopLong())
return math.Float64frombits(bits)
}
func (self *OperandStack) PushRef(ref *heap.Object) {
self.slots[self.size].ref = ref
self.size++
}
func (self *OperandStack) PopRef() *heap.Object {
self.size--
ref := self.slots[self.size].ref
self.slots[self.size].ref = nil
return ref
}
func (self *OperandStack) PushSlot(slot Slot) {
self.slots[self.size] = slot
self.size++
}
func (self *OperandStack) PopSlot() Slot {
self.size--
return self.slots[self.size]
}
func (self *OperandStack) GetRefFromTop(n uint) *heap.Object {
return self.slots[self.size-1-n].ref
}
func (self *OperandStack) PushBoolean(val bool) {
if val {
self.PushInt(1)
} else {
self.PushInt(0)
}
}
func (self *OperandStack) PopBoolean() bool {
return self.PopInt() == 1
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/operand_stack.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 606
|
```go
package rtda
import "math"
import "jvmgo/ch09/rtda/heap"
type LocalVars []Slot
func newLocalVars(maxLocals uint) LocalVars {
if maxLocals > 0 {
return make([]Slot, maxLocals)
}
return nil
}
func (self LocalVars) SetInt(index uint, val int32) {
self[index].num = val
}
func (self LocalVars) GetInt(index uint) int32 {
return self[index].num
}
func (self LocalVars) SetFloat(index uint, val float32) {
bits := math.Float32bits(val)
self[index].num = int32(bits)
}
func (self LocalVars) GetFloat(index uint) float32 {
bits := uint32(self[index].num)
return math.Float32frombits(bits)
}
// long consumes two slots
func (self LocalVars) SetLong(index uint, val int64) {
self[index].num = int32(val)
self[index+1].num = int32(val >> 32)
}
func (self LocalVars) GetLong(index uint) int64 {
low := uint32(self[index].num)
high := uint32(self[index+1].num)
return int64(high)<<32 | int64(low)
}
// double consumes two slots
func (self LocalVars) SetDouble(index uint, val float64) {
bits := math.Float64bits(val)
self.SetLong(index, int64(bits))
}
func (self LocalVars) GetDouble(index uint) float64 {
bits := uint64(self.GetLong(index))
return math.Float64frombits(bits)
}
func (self LocalVars) SetRef(index uint, ref *heap.Object) {
self[index].ref = ref
}
func (self LocalVars) GetRef(index uint) *heap.Object {
return self[index].ref
}
func (self LocalVars) SetSlot(index uint, slot Slot) {
self[index] = slot
}
func (self LocalVars) GetThis() *heap.Object {
return self.GetRef(0)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/local_vars.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 436
|
```go
package rtda
import "jvmgo/ch09/rtda/heap"
type Slot struct {
num int32
ref *heap.Object
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/slot.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 33
|
```go
package rtda
import "jvmgo/ch09/rtda/heap"
// stack frame
type Frame struct {
lower *Frame // stack is implemented as linked list
localVars LocalVars
operandStack *OperandStack
thread *Thread
method *heap.Method
nextPC int // the next instruction after the call
}
func newFrame(thread *Thread, method *heap.Method) *Frame {
return &Frame{
thread: thread,
method: method,
localVars: newLocalVars(method.MaxLocals()),
operandStack: newOperandStack(method.MaxStack()),
}
}
// getters & setters
func (self *Frame) LocalVars() LocalVars {
return self.localVars
}
func (self *Frame) OperandStack() *OperandStack {
return self.operandStack
}
func (self *Frame) Thread() *Thread {
return self.thread
}
func (self *Frame) Method() *heap.Method {
return self.method
}
func (self *Frame) NextPC() int {
return self.nextPC
}
func (self *Frame) SetNextPC(nextPC int) {
self.nextPC = nextPC
}
func (self *Frame) RevertNextPC() {
self.nextPC = self.thread.pc
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/frame.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 272
|
```go
package rtda
// jvm stack
type Stack struct {
maxSize uint
size uint
_top *Frame // stack is implemented as linked list
}
func newStack(maxSize uint) *Stack {
return &Stack{
maxSize: maxSize,
}
}
func (self *Stack) push(frame *Frame) {
if self.size >= self.maxSize {
panic("java.lang.StackOverflowError")
}
if self._top != nil {
frame.lower = self._top
}
self._top = frame
self.size++
}
func (self *Stack) pop() *Frame {
if self._top == nil {
panic("jvm stack is empty!")
}
top := self._top
self._top = top.lower
top.lower = nil
self.size--
return top
}
func (self *Stack) top() *Frame {
if self._top == nil {
panic("jvm stack is empty!")
}
return self._top
}
func (self *Stack) isEmpty() bool {
return self._top == nil
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/jvm_stack.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 225
|
```go
package heap
// symbolic reference
type SymRef struct {
cp *ConstantPool
className string
class *Class
}
func (self *SymRef) ResolvedClass() *Class {
if self.class == nil {
self.resolveClassRef()
}
return self.class
}
// jvms8 5.4.3.1
func (self *SymRef) resolveClassRef() {
d := self.cp.class
c := d.loader.LoadClass(self.className)
if !c.isAccessibleTo(d) {
panic("java.lang.IllegalAccessError")
}
self.class = c
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/heap/cp_symref.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 129
|
```go
package heap
import "jvmgo/ch09/classfile"
type MethodRef struct {
MemberRef
method *Method
}
func newMethodRef(cp *ConstantPool, refInfo *classfile.ConstantMethodrefInfo) *MethodRef {
ref := &MethodRef{}
ref.cp = cp
ref.copyMemberRefInfo(&refInfo.ConstantMemberrefInfo)
return ref
}
func (self *MethodRef) ResolvedMethod() *Method {
if self.method == nil {
self.resolveMethodRef()
}
return self.method
}
// jvms8 5.4.3.3
func (self *MethodRef) resolveMethodRef() {
d := self.cp.class
c := self.ResolvedClass()
if c.IsInterface() {
panic("java.lang.IncompatibleClassChangeError")
}
method := lookupMethod(c, self.name, self.descriptor)
if method == nil {
panic("java.lang.NoSuchMethodError")
}
if !method.isAccessibleTo(d) {
panic("java.lang.IllegalAccessError")
}
self.method = method
}
func lookupMethod(class *Class, name, descriptor string) *Method {
method := LookupMethodInClass(class, name, descriptor)
if method == nil {
method = lookupMethodInInterfaces(class.interfaces, name, descriptor)
}
return method
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/heap/cp_methodref.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 277
|
```go
package heap
import "fmt"
import "jvmgo/ch09/classfile"
type Constant interface{}
type ConstantPool struct {
class *Class
consts []Constant
}
func newConstantPool(class *Class, cfCp classfile.ConstantPool) *ConstantPool {
cpCount := len(cfCp)
consts := make([]Constant, cpCount)
rtCp := &ConstantPool{class, consts}
for i := 1; i < cpCount; i++ {
cpInfo := cfCp[i]
switch cpInfo.(type) {
case *classfile.ConstantIntegerInfo:
intInfo := cpInfo.(*classfile.ConstantIntegerInfo)
consts[i] = intInfo.Value()
case *classfile.ConstantFloatInfo:
floatInfo := cpInfo.(*classfile.ConstantFloatInfo)
consts[i] = floatInfo.Value()
case *classfile.ConstantLongInfo:
longInfo := cpInfo.(*classfile.ConstantLongInfo)
consts[i] = longInfo.Value()
i++
case *classfile.ConstantDoubleInfo:
doubleInfo := cpInfo.(*classfile.ConstantDoubleInfo)
consts[i] = doubleInfo.Value()
i++
case *classfile.ConstantStringInfo:
stringInfo := cpInfo.(*classfile.ConstantStringInfo)
consts[i] = stringInfo.String()
case *classfile.ConstantClassInfo:
classInfo := cpInfo.(*classfile.ConstantClassInfo)
consts[i] = newClassRef(rtCp, classInfo)
case *classfile.ConstantFieldrefInfo:
fieldrefInfo := cpInfo.(*classfile.ConstantFieldrefInfo)
consts[i] = newFieldRef(rtCp, fieldrefInfo)
case *classfile.ConstantMethodrefInfo:
methodrefInfo := cpInfo.(*classfile.ConstantMethodrefInfo)
consts[i] = newMethodRef(rtCp, methodrefInfo)
case *classfile.ConstantInterfaceMethodrefInfo:
methodrefInfo := cpInfo.(*classfile.ConstantInterfaceMethodrefInfo)
consts[i] = newInterfaceMethodRef(rtCp, methodrefInfo)
default:
// todo
}
}
return rtCp
}
func (self *ConstantPool) GetConstant(index uint) Constant {
if c := self.consts[index]; c != nil {
return c
}
panic(fmt.Sprintf("No constants at index %d", index))
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/heap/constant_pool.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 517
|
```go
package heap
import "strings"
import "jvmgo/ch09/classfile"
// name, superClassName and interfaceNames are all binary names(jvms8-4.2.1)
type Class struct {
accessFlags uint16
name string // thisClassName
superClassName string
interfaceNames []string
constantPool *ConstantPool
fields []*Field
methods []*Method
loader *ClassLoader
superClass *Class
interfaces []*Class
instanceSlotCount uint
staticSlotCount uint
staticVars Slots
initStarted bool
jClass *Object
}
func newClass(cf *classfile.ClassFile) *Class {
class := &Class{}
class.accessFlags = cf.AccessFlags()
class.name = cf.ClassName()
class.superClassName = cf.SuperClassName()
class.interfaceNames = cf.InterfaceNames()
class.constantPool = newConstantPool(class, cf.ConstantPool())
class.fields = newFields(class, cf.Fields())
class.methods = newMethods(class, cf.Methods())
return class
}
func (self *Class) IsPublic() bool {
return 0 != self.accessFlags&ACC_PUBLIC
}
func (self *Class) IsFinal() bool {
return 0 != self.accessFlags&ACC_FINAL
}
func (self *Class) IsSuper() bool {
return 0 != self.accessFlags&ACC_SUPER
}
func (self *Class) IsInterface() bool {
return 0 != self.accessFlags&ACC_INTERFACE
}
func (self *Class) IsAbstract() bool {
return 0 != self.accessFlags&ACC_ABSTRACT
}
func (self *Class) IsSynthetic() bool {
return 0 != self.accessFlags&ACC_SYNTHETIC
}
func (self *Class) IsAnnotation() bool {
return 0 != self.accessFlags&ACC_ANNOTATION
}
func (self *Class) IsEnum() bool {
return 0 != self.accessFlags&ACC_ENUM
}
// getters
func (self *Class) Name() string {
return self.name
}
func (self *Class) ConstantPool() *ConstantPool {
return self.constantPool
}
func (self *Class) Fields() []*Field {
return self.fields
}
func (self *Class) Methods() []*Method {
return self.methods
}
func (self *Class) Loader() *ClassLoader {
return self.loader
}
func (self *Class) SuperClass() *Class {
return self.superClass
}
func (self *Class) StaticVars() Slots {
return self.staticVars
}
func (self *Class) InitStarted() bool {
return self.initStarted
}
func (self *Class) JClass() *Object {
return self.jClass
}
func (self *Class) StartInit() {
self.initStarted = true
}
// jvms 5.4.4
func (self *Class) isAccessibleTo(other *Class) bool {
return self.IsPublic() ||
self.GetPackageName() == other.GetPackageName()
}
func (self *Class) GetPackageName() string {
if i := strings.LastIndex(self.name, "/"); i >= 0 {
return self.name[:i]
}
return ""
}
func (self *Class) GetMainMethod() *Method {
return self.getMethod("main", "([Ljava/lang/String;)V", true)
}
func (self *Class) GetClinitMethod() *Method {
return self.getMethod("<clinit>", "()V", true)
}
func (self *Class) getMethod(name, descriptor string, isStatic bool) *Method {
for c := self; c != nil; c = c.superClass {
for _, method := range c.methods {
if method.IsStatic() == isStatic &&
method.name == name &&
method.descriptor == descriptor {
return method
}
}
}
return nil
}
func (self *Class) getField(name, descriptor string, isStatic bool) *Field {
for c := self; c != nil; c = c.superClass {
for _, field := range c.fields {
if field.IsStatic() == isStatic &&
field.name == name &&
field.descriptor == descriptor {
return field
}
}
}
return nil
}
func (self *Class) isJlObject() bool {
return self.name == "java/lang/Object"
}
func (self *Class) isJlCloneable() bool {
return self.name == "java/lang/Cloneable"
}
func (self *Class) isJioSerializable() bool {
return self.name == "java/io/Serializable"
}
func (self *Class) NewObject() *Object {
return newObject(self)
}
func (self *Class) ArrayClass() *Class {
arrayClassName := getArrayClassName(self.name)
return self.loader.LoadClass(arrayClassName)
}
func (self *Class) JavaName() string {
return strings.Replace(self.name, "/", ".", -1)
}
func (self *Class) IsPrimitive() bool {
_, ok := primitiveTypes[self.name]
return ok
}
func (self *Class) GetInstanceMethod(name, descriptor string) *Method {
return self.getMethod(name, descriptor, false)
}
func (self *Class) GetRefVar(fieldName, fieldDescriptor string) *Object {
field := self.getField(fieldName, fieldDescriptor, true)
return self.staticVars.GetRef(field.slotId)
}
func (self *Class) SetRefVar(fieldName, fieldDescriptor string, ref *Object) {
field := self.getField(fieldName, fieldDescriptor, true)
self.staticVars.SetRef(field.slotId, ref)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/heap/class.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 1,167
|
```go
package heap
import "jvmgo/ch09/classfile"
type FieldRef struct {
MemberRef
field *Field
}
func newFieldRef(cp *ConstantPool, refInfo *classfile.ConstantFieldrefInfo) *FieldRef {
ref := &FieldRef{}
ref.cp = cp
ref.copyMemberRefInfo(&refInfo.ConstantMemberrefInfo)
return ref
}
func (self *FieldRef) ResolvedField() *Field {
if self.field == nil {
self.resolveFieldRef()
}
return self.field
}
// jvms 5.4.3.2
func (self *FieldRef) resolveFieldRef() {
d := self.cp.class
c := self.ResolvedClass()
field := lookupField(c, self.name, self.descriptor)
if field == nil {
panic("java.lang.NoSuchFieldError")
}
if !field.isAccessibleTo(d) {
panic("java.lang.IllegalAccessError")
}
self.field = field
}
func lookupField(c *Class, name, descriptor string) *Field {
for _, field := range c.fields {
if field.name == name && field.descriptor == descriptor {
return field
}
}
for _, iface := range c.interfaces {
if field := lookupField(iface, name, descriptor); field != nil {
return field
}
}
if c.superClass != nil {
return lookupField(c.superClass, name, descriptor)
}
return nil
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/heap/cp_fieldref.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 308
|
```go
package heap
// jvms8 6.5.instanceof
// jvms8 6.5.checkcast
func (self *Class) isAssignableFrom(other *Class) bool {
s, t := other, self
if s == t {
return true
}
if !s.IsArray() {
if !s.IsInterface() {
// s is class
if !t.IsInterface() {
// t is not interface
return s.IsSubClassOf(t)
} else {
// t is interface
return s.IsImplements(t)
}
} else {
// s is interface
if !t.IsInterface() {
// t is not interface
return t.isJlObject()
} else {
// t is interface
return t.isSuperInterfaceOf(s)
}
}
} else {
// s is array
if !t.IsArray() {
if !t.IsInterface() {
// t is class
return t.isJlObject()
} else {
// t is interface
return t.isJlCloneable() || t.isJioSerializable()
}
} else {
// t is array
sc := s.ComponentClass()
tc := t.ComponentClass()
return sc == tc || tc.isAssignableFrom(sc)
}
}
return false
}
// self extends c
func (self *Class) IsSubClassOf(other *Class) bool {
for c := self.superClass; c != nil; c = c.superClass {
if c == other {
return true
}
}
return false
}
// self implements iface
func (self *Class) IsImplements(iface *Class) bool {
for c := self; c != nil; c = c.superClass {
for _, i := range c.interfaces {
if i == iface || i.isSubInterfaceOf(iface) {
return true
}
}
}
return false
}
// self extends iface
func (self *Class) isSubInterfaceOf(iface *Class) bool {
for _, superInterface := range self.interfaces {
if superInterface == iface || superInterface.isSubInterfaceOf(iface) {
return true
}
}
return false
}
// c extends self
func (self *Class) IsSuperClassOf(other *Class) bool {
return other.IsSubClassOf(self)
}
// iface extends self
func (self *Class) isSuperInterfaceOf(iface *Class) bool {
return iface.isSubInterfaceOf(self)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/heap/class_hierarchy.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 568
|
```go
package heap
import "jvmgo/ch09/classfile"
type ClassRef struct {
SymRef
}
func newClassRef(cp *ConstantPool, classInfo *classfile.ConstantClassInfo) *ClassRef {
ref := &ClassRef{}
ref.cp = cp
ref.className = classInfo.Name()
return ref
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/heap/cp_classref.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 68
|
```go
package heap
import "strings"
type MethodDescriptorParser struct {
raw string
offset int
parsed *MethodDescriptor
}
func parseMethodDescriptor(descriptor string) *MethodDescriptor {
parser := &MethodDescriptorParser{}
return parser.parse(descriptor)
}
func (self *MethodDescriptorParser) parse(descriptor string) *MethodDescriptor {
self.raw = descriptor
self.parsed = &MethodDescriptor{}
self.startParams()
self.parseParamTypes()
self.endParams()
self.parseReturnType()
self.finish()
return self.parsed
}
func (self *MethodDescriptorParser) startParams() {
if self.readUint8() != '(' {
self.causePanic()
}
}
func (self *MethodDescriptorParser) endParams() {
if self.readUint8() != ')' {
self.causePanic()
}
}
func (self *MethodDescriptorParser) finish() {
if self.offset != len(self.raw) {
self.causePanic()
}
}
func (self *MethodDescriptorParser) causePanic() {
panic("BAD descriptor: " + self.raw)
}
func (self *MethodDescriptorParser) readUint8() uint8 {
b := self.raw[self.offset]
self.offset++
return b
}
func (self *MethodDescriptorParser) unreadUint8() {
self.offset--
}
func (self *MethodDescriptorParser) parseParamTypes() {
for {
t := self.parseFieldType()
if t != "" {
self.parsed.addParameterType(t)
} else {
break
}
}
}
func (self *MethodDescriptorParser) parseReturnType() {
if self.readUint8() == 'V' {
self.parsed.returnType = "V"
return
}
self.unreadUint8()
t := self.parseFieldType()
if t != "" {
self.parsed.returnType = t
return
}
self.causePanic()
}
func (self *MethodDescriptorParser) parseFieldType() string {
switch self.readUint8() {
case 'B':
return "B"
case 'C':
return "C"
case 'D':
return "D"
case 'F':
return "F"
case 'I':
return "I"
case 'J':
return "J"
case 'S':
return "S"
case 'Z':
return "Z"
case 'L':
return self.parseObjectType()
case '[':
return self.parseArrayType()
default:
self.unreadUint8()
return ""
}
}
func (self *MethodDescriptorParser) parseObjectType() string {
unread := self.raw[self.offset:]
semicolonIndex := strings.IndexRune(unread, ';')
if semicolonIndex == -1 {
self.causePanic()
return ""
} else {
objStart := self.offset - 1
objEnd := self.offset + semicolonIndex + 1
self.offset = objEnd
descriptor := self.raw[objStart:objEnd]
return descriptor
}
}
func (self *MethodDescriptorParser) parseArrayType() string {
arrStart := self.offset - 1
self.parseFieldType()
arrEnd := self.offset
descriptor := self.raw[arrStart:arrEnd]
return descriptor
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/heap/method_descriptor_parser.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 675
|
```go
package heap
import "jvmgo/ch09/classfile"
type ClassMember struct {
accessFlags uint16
name string
descriptor string
class *Class
}
func (self *ClassMember) copyMemberInfo(memberInfo *classfile.MemberInfo) {
self.accessFlags = memberInfo.AccessFlags()
self.name = memberInfo.Name()
self.descriptor = memberInfo.Descriptor()
}
func (self *ClassMember) IsPublic() bool {
return 0 != self.accessFlags&ACC_PUBLIC
}
func (self *ClassMember) IsPrivate() bool {
return 0 != self.accessFlags&ACC_PRIVATE
}
func (self *ClassMember) IsProtected() bool {
return 0 != self.accessFlags&ACC_PROTECTED
}
func (self *ClassMember) IsStatic() bool {
return 0 != self.accessFlags&ACC_STATIC
}
func (self *ClassMember) IsFinal() bool {
return 0 != self.accessFlags&ACC_FINAL
}
func (self *ClassMember) IsSynthetic() bool {
return 0 != self.accessFlags&ACC_SYNTHETIC
}
// getters
func (self *ClassMember) Name() string {
return self.name
}
func (self *ClassMember) Descriptor() string {
return self.descriptor
}
func (self *ClassMember) Class() *Class {
return self.class
}
// jvms 5.4.4
func (self *ClassMember) isAccessibleTo(d *Class) bool {
if self.IsPublic() {
return true
}
c := self.class
if self.IsProtected() {
return d == c || d.IsSubClassOf(c) ||
c.GetPackageName() == d.GetPackageName()
}
if !self.IsPrivate() {
return c.GetPackageName() == d.GetPackageName()
}
return d == c
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/heap/class_member.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 387
|
```go
package heap
import "unicode/utf16"
var internedStrings = map[string]*Object{}
// todo
// go string -> java.lang.String
func JString(loader *ClassLoader, goStr string) *Object {
if internedStr, ok := internedStrings[goStr]; ok {
return internedStr
}
chars := stringToUtf16(goStr)
jChars := &Object{loader.LoadClass("[C"), chars, nil}
jStr := loader.LoadClass("java/lang/String").NewObject()
jStr.SetRefVar("value", "[C", jChars)
internedStrings[goStr] = jStr
return jStr
}
// java.lang.String -> go string
func GoString(jStr *Object) string {
charArr := jStr.GetRefVar("value", "[C")
return utf16ToString(charArr.Chars())
}
// utf8 -> utf16
func stringToUtf16(s string) []uint16 {
runes := []rune(s) // utf32
return utf16.Encode(runes) // func Encode(s []rune) []uint16
}
// utf16 -> utf8
func utf16ToString(s []uint16) string {
runes := utf16.Decode(s) // func Decode(s []uint16) []rune
return string(runes)
}
// todo
func InternString(jStr *Object) *Object {
goStr := GoString(jStr)
if internedStr, ok := internedStrings[goStr]; ok {
return internedStr
}
internedStrings[goStr] = jStr
return jStr
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/heap/string_pool.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 342
|
```go
package heap
var primitiveTypes = map[string]string{
"void": "V",
"boolean": "Z",
"byte": "B",
"short": "S",
"int": "I",
"long": "J",
"char": "C",
"float": "F",
"double": "D",
}
// [XXX -> [[XXX
// int -> [I
// XXX -> [LXXX;
func getArrayClassName(className string) string {
return "[" + toDescriptor(className)
}
// [[XXX -> [XXX
// [LXXX; -> XXX
// [I -> int
func getComponentClassName(className string) string {
if className[0] == '[' {
componentTypeDescriptor := className[1:]
return toClassName(componentTypeDescriptor)
}
panic("Not array: " + className)
}
// [XXX => [XXX
// int => I
// XXX => LXXX;
func toDescriptor(className string) string {
if className[0] == '[' {
// array
return className
}
if d, ok := primitiveTypes[className]; ok {
// primitive
return d
}
// object
return "L" + className + ";"
}
// [XXX => [XXX
// LXXX; => XXX
// I => int
func toClassName(descriptor string) string {
if descriptor[0] == '[' {
// array
return descriptor
}
if descriptor[0] == 'L' {
// object
return descriptor[1 : len(descriptor)-1]
}
for className, d := range primitiveTypes {
if d == descriptor {
// primitive
return className
}
}
panic("Invalid descriptor: " + descriptor)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/heap/class_name_helper.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 387
|
```go
package heap
type Object struct {
class *Class
data interface{} // Slots for Object, []int32 for int[] ...
extra interface{}
}
// create normal (non-array) object
func newObject(class *Class) *Object {
return &Object{
class: class,
data: newSlots(class.instanceSlotCount),
}
}
// getters & setters
func (self *Object) Class() *Class {
return self.class
}
func (self *Object) Fields() Slots {
return self.data.(Slots)
}
func (self *Object) Extra() interface{} {
return self.extra
}
func (self *Object) SetExtra(extra interface{}) {
self.extra = extra
}
func (self *Object) IsInstanceOf(class *Class) bool {
return class.isAssignableFrom(self.class)
}
// reflection
func (self *Object) GetRefVar(name, descriptor string) *Object {
field := self.class.getField(name, descriptor, false)
slots := self.data.(Slots)
return slots.GetRef(field.slotId)
}
func (self *Object) SetRefVar(name, descriptor string, ref *Object) {
field := self.class.getField(name, descriptor, false)
slots := self.data.(Slots)
slots.SetRef(field.slotId, ref)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/heap/object.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 266
|
```go
package heap
import "jvmgo/ch09/classfile"
type MemberRef struct {
SymRef
name string
descriptor string
}
func (self *MemberRef) copyMemberRefInfo(refInfo *classfile.ConstantMemberrefInfo) {
self.className = refInfo.ClassName()
self.name, self.descriptor = refInfo.NameAndDescriptor()
}
func (self *MemberRef) Name() string {
return self.name
}
func (self *MemberRef) Descriptor() string {
return self.descriptor
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/heap/cp_memberref.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 107
|
```go
package heap
type MethodDescriptor struct {
parameterTypes []string
returnType string
}
func (self *MethodDescriptor) addParameterType(t string) {
pLen := len(self.parameterTypes)
if pLen == cap(self.parameterTypes) {
s := make([]string, pLen, pLen+4)
copy(s, self.parameterTypes)
self.parameterTypes = s
}
self.parameterTypes = append(self.parameterTypes, t)
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/heap/method_descriptor.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 97
|
```go
package heap
import "jvmgo/ch09/classfile"
type Method struct {
ClassMember
maxStack uint
maxLocals uint
code []byte
argSlotCount uint
}
func newMethods(class *Class, cfMethods []*classfile.MemberInfo) []*Method {
methods := make([]*Method, len(cfMethods))
for i, cfMethod := range cfMethods {
methods[i] = newMethod(class, cfMethod)
}
return methods
}
func newMethod(class *Class, cfMethod *classfile.MemberInfo) *Method {
method := &Method{}
method.class = class
method.copyMemberInfo(cfMethod)
method.copyAttributes(cfMethod)
md := parseMethodDescriptor(method.descriptor)
method.calcArgSlotCount(md.parameterTypes)
if method.IsNative() {
method.injectCodeAttribute(md.returnType)
}
return method
}
func (self *Method) copyAttributes(cfMethod *classfile.MemberInfo) {
if codeAttr := cfMethod.CodeAttribute(); codeAttr != nil {
self.maxStack = codeAttr.MaxStack()
self.maxLocals = codeAttr.MaxLocals()
self.code = codeAttr.Code()
}
}
func (self *Method) calcArgSlotCount(paramTypes []string) {
for _, paramType := range paramTypes {
self.argSlotCount++
if paramType == "J" || paramType == "D" {
self.argSlotCount++
}
}
if !self.IsStatic() {
self.argSlotCount++ // `this` reference
}
}
func (self *Method) injectCodeAttribute(returnType string) {
self.maxStack = 4 // todo
self.maxLocals = self.argSlotCount
switch returnType[0] {
case 'V':
self.code = []byte{0xfe, 0xb1} // return
case 'L', '[':
self.code = []byte{0xfe, 0xb0} // areturn
case 'D':
self.code = []byte{0xfe, 0xaf} // dreturn
case 'F':
self.code = []byte{0xfe, 0xae} // freturn
case 'J':
self.code = []byte{0xfe, 0xad} // lreturn
default:
self.code = []byte{0xfe, 0xac} // ireturn
}
}
func (self *Method) IsSynchronized() bool {
return 0 != self.accessFlags&ACC_SYNCHRONIZED
}
func (self *Method) IsBridge() bool {
return 0 != self.accessFlags&ACC_BRIDGE
}
func (self *Method) IsVarargs() bool {
return 0 != self.accessFlags&ACC_VARARGS
}
func (self *Method) IsNative() bool {
return 0 != self.accessFlags&ACC_NATIVE
}
func (self *Method) IsAbstract() bool {
return 0 != self.accessFlags&ACC_ABSTRACT
}
func (self *Method) IsStrict() bool {
return 0 != self.accessFlags&ACC_STRICT
}
// getters
func (self *Method) MaxStack() uint {
return self.maxStack
}
func (self *Method) MaxLocals() uint {
return self.maxLocals
}
func (self *Method) Code() []byte {
return self.code
}
func (self *Method) ArgSlotCount() uint {
return self.argSlotCount
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/heap/method.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 720
|
```go
package heap
const (
ACC_PUBLIC = 0x0001 // class field method
ACC_PRIVATE = 0x0002 // field method
ACC_PROTECTED = 0x0004 // field method
ACC_STATIC = 0x0008 // field method
ACC_FINAL = 0x0010 // class field method
ACC_SUPER = 0x0020 // class
ACC_SYNCHRONIZED = 0x0020 // method
ACC_VOLATILE = 0x0040 // field
ACC_BRIDGE = 0x0040 // method
ACC_TRANSIENT = 0x0080 // field
ACC_VARARGS = 0x0080 // method
ACC_NATIVE = 0x0100 // method
ACC_INTERFACE = 0x0200 // class
ACC_ABSTRACT = 0x0400 // class method
ACC_STRICT = 0x0800 // method
ACC_SYNTHETIC = 0x1000 // class field method
ACC_ANNOTATION = 0x2000 // class
ACC_ENUM = 0x4000 // class field
)
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/heap/access_flags.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 278
|
```go
package heap
func LookupMethodInClass(class *Class, name, descriptor string) *Method {
for c := class; c != nil; c = c.superClass {
for _, method := range c.methods {
if method.name == name && method.descriptor == descriptor {
return method
}
}
}
return nil
}
func lookupMethodInInterfaces(ifaces []*Class, name, descriptor string) *Method {
for _, iface := range ifaces {
for _, method := range iface.methods {
if method.name == name && method.descriptor == descriptor {
return method
}
}
method := lookupMethodInInterfaces(iface.interfaces, name, descriptor)
if method != nil {
return method
}
}
return nil
}
```
|
/content/code_sandbox/v1/code/go/src/jvmgo/ch09/rtda/heap/method_lookup.go
|
go
| 2016-01-06T13:13:45
| 2024-08-16T13:42:58
|
jvmgo-book
|
zxh0/jvmgo-book
| 1,605
| 164
|
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