A tiny JVM (Java Virtual Machine) program written in TypeScript.

Related tags

Learning resource javascript java typescript jvm
Overview

jvm-on-typescript

A tiny JVM (Java Virtual Machine) program written in TypeScript.
This virtual machine specification compliants Java Virtual Machine Specification (Java 8 Edition).

Usage

Instant Run

  1. Open index.html on Browser.
  2. Select a *.class file.
  3. Open "Developer Tool" and open "Console" tab.

Run in code

const buffer: ArrayBuffer = new ArrayBuffer();  // Binary data of the class file;
const jvm = new JVM(buffer);
jvm.load();  // Load class file and invoke main method.

Functions

  • Some of primitive/reference types
    • int/long/float/double values, variables
      • addition/subtraction/multiply/division/shl/shr
      • String type
    • String
      • sum of String (by StringBuilder)
  • Print "Hello, World!"
    • System.out.println("Hello, World!");
  • Fizz Buzz problem
    • If statement
    • For statement

Implemented Opcodes

Mnemonic Opcode isImplemented
nop 0x00 ✓
aconst_null 0x01
iconst_m1 0x02 ✓
iconst_0 0x03 ✓
iconst_1 0x04 ✓
iconst_2 0x05 ✓
iconst_3 0x06 ✓
iconst_4 0x07 ✓
iconst_5 0x08 ✓
lconst_0 0x09 ✓
lconst_1 0x0a ✓
fconst_0 0x0b ✓
fconst_1 0x0c ✓
fconst_2 0x0d ✓
dconst_0 0x0e ✓
dconst_1 0x0f ✓
bipush 0x10 ✓
sipush 0x11
ldc 0x12 ✓
ldc_w 0x13
ldc2_w 0x14
iload 0x15 ✓
lload 0x16 ✓
fload 0x17 ✓
dload 0x18 ✓
aload 0x19
iload_0 0x1a ✓
iload_1 0x1b ✓
iload_2 0x1c ✓
iload_3 0x1d ✓
lload_0 0x1e ✓
lload_1 0x1f ✓
lload_2 0x20 ✓
lload_3 0x21 ✓
fload_0 0x22 ✓
fload_1 0x23 ✓
fload_2 0x24 ✓
fload_3 0x25 ✓
dload_0 0x26 ✓
dload_1 0x27 ✓
dload_2 0x28 ✓
dload_3 0x29 ✓
aload_0 0x2a
aload_1 0x2b
aload_2 0x2c
aload_3 0x2d
iaload 0x2e
laload 0x2f
faload 0x30
daload 0x31
aaload 0x32
baload 0x33
caload 0x34
saload 0x35
istore 0x36 ✓
lstore 0x37 ✓
fstore 0x38 ✓
dstore 0x39 ✓
astore 0x3a
istore_0 0x3b ✓
istore_1 0x3c ✓
istore_2 0x3d ✓
istore_3 0x3e ✓
lstore_0 0x3f ✓
lstore_1 0x40 ✓
lstore_2 0x41 ✓
lstore_3 0x42 ✓
fstore_0 0x43 ✓
fstore_1 0x44 ✓
fstore_2 0x45 ✓
fstore_3 0x46 ✓
dstore_0 0x47 ✓
dstore_1 0x48 ✓
dstore_2 0x49 ✓
dstore_3 0x4a ✓
astore_0 0x4b
astore_1 0x4c
astore_2 0x4d
astore_3 0x4e
iastore 0x4f
lastore 0x50
fastore 0x51
dastore 0x52
aastore 0x53
bastore 0x54
castore 0x55
sastore 0x56
pop 0x57 ✓
pop2 0x58 ✓
dup 0x59 ✓
dup_x1 0x5a
dup_x2 0x5b
dup2 0x5c
dup2_x1 0x5d
dup2_x2 0x5e
swap 0x5f
iadd 0x60 ✓
ladd 0x61 ✓
fadd 0x62 ✓
dadd 0x63 ✓
isub 0x64 ✓
lsub 0x65 ✓
fsub 0x66 ✓
dsub 0x67 ✓
imul 0x68 ✓
lmul 0x69 ✓
fmul 0x6a ✓
dmul 0x6b ✓
idiv 0x6c ✓
ldiv 0x6d ✓
fdiv 0x6e ✓
ddiv 0x6f ✓
irem 0x70 ✓
lrem 0x71 ✓
frem 0x72 ✓
drem 0x73 ✓
ineg 0x74 ✓
lneg 0x75 ✓
fneg 0x76 ✓
dneg 0x77 ✓
ishl 0x78 ✓
lshl 0x79 ✓
ishr 0x7a ✓
lshr 0x7b ✓
iushr 0x7c ✓
lushr 0x7d ✓
iand 0x7e ✓
land 0x7f ✓
ior 0x80 ✓
lor 0x81 ✓
ixor 0x82 ✓
lxor 0x83 ✓
iinc 0x84 ✓
i2l 0x85 -
i2f 0x86 -
i2d 0x87 -
l2i 0x88 -
l2f 0x89 -
l2d 0x8a -
f2i 0x8b -
f2l 0x8c -
f2d 0x8d -
d2i 0x8e -
d2l 0x8f -
d2f 0x90 -
i2b 0x91 -
i2c 0x92 -
i2s 0x93 -
lcmp 0x94 ✓
fcmpl 0x95 ✓
fcmpg 0x96 ✓
dcmpl 0x97 ✓
dcmpg 0x98 ✓
ifeq 0x99 ✓
ifne 0x9a ✓
iflt 0x9b ✓
ifge 0x9c ✓
ifgt 0x9d ✓
ifle 0x9e ✓
if_icmpeq 0x9f ✓
if_icmpne 0xa0 ✓
if_icmplt 0xa1 ✓
if_icmpge 0xa2 ✓
if_icmpgt 0xa3 ✓
if_icmple 0xa4 ✓
if_acmpeq 0xa5 ✓
if_acmpne 0xa6 ✓
goto 0xa7
jsr 0xa8
ret 0xa9
tableswitch 0xaa
lookupswitch 0xab
ireturn 0xac
lreturn 0xad
freturn 0xae
dreturn 0xaf
areturn 0xb0
return 0xb1 ✓
getstatic 0xb2 ✓
putstatic 0xb3
getfield 0xb4
putfield 0xb5
invokevirtual 0xb6 ✓
invokespecial 0xb7 ✓
invokestatic 0xb8
invokeinterface 0xb9
invokedynamic 0xba
new 0xbb ✓
newarray 0xbc
anewarray 0xbd
arraylength 0xbe
athrow 0xbf
checkcast 0xc0
instanceof 0xc1
monitorenter 0xc2
monitorexit 0xc3
wide 0xc4
multianewarray 0xc5
ifnull 0xc6
ifnonnull 0xc7
goto_w 0xc8
jsr_w 0xc9
breakpoint 0xca

References

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Comments
  • Please add license

    Please add license

    Hi. I have a petproject intended to make old j2me games available in browser. I decompiled and rewrited in kotlin some games, but now I want to try to create the runtime on typescript that will support all the games without rewriting by hand. Some parts of your vm will be useful. Btw maybe you will be interested in the project? I'm also a third year student. Do you have any social networks, maybe telegram? I can show more of my experiments https://user-images.githubusercontent.com/25568730/201519844-f2902ae6-ced0-4425-bc6c-5a740a726bca.mp4

    opened by asimaranov 1
Owner
Itsu
ITF.21 scs2
Itsu
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