TODO:
- dir - Java class file directory listing
| module | desc. | structs |
|---|---|---|
| common.h | setting and macros | |
| core.h | common classes | List, Method, Word |
| thread.* | core thread (i.e. task) class | Thread |
| mmu.* | memory pool managemer | KV, Pool |
| loader.* | bytecode loader | Loader |
| java.* | java virtual machine | |
| forth.* | Forth words | uForth |
| forth_io.cpp | Forth IO functions | |
| ucode.* | JVM microcode unit | Ucode |
| esp32.cpp | ESP32 words | uESP32 |
| main.cpp | main module |
| case | methods | note |
|---|---|---|
| Hello | basic function call (in main) | words, clock, here, -=, -, ss |
| IfElesThen | conditional branch | if ( > ) else |
| ForLoop | for loop and benchmark | outer; for (int i=0; i<4; i++); clock |
| ForLoop2 | for loop (2-d) and benchmark | clock |
| InstVar | class static, instance vars | new, clock, here, delay |
| NObj | create new objects with instance vars | |
| ObjMethod | calling object method | new, clock |
| Outer | Forth outer interpreter loop | clock, dump, delay |
| System.out.print, println | ||
| ESP32Test | ESP pin interfacing | pinMode, digitalWrite |
| Array01 | Java array | a[], a.length |
| Array02 | Java 2-d array | ?a[][], 2-deep loops |
Use the following toolchain to produce bytecode (and analysis)
* Forth - words/methods provided by Forth
* ESP32 - words/methods provided by ESP32
javac -cp . -g:none InstVar.java
javap -c -p InstVar.class
od -A x -t x1z -v InstVar.class
java -cp . InstVar
Example:
/home/gnii/devel/java/nanojvm/tests% ../Debug/nanojvm InstVar.class
Java class file: InstVar.class
0000: ca fe ba be 00 00 00 37 00 23 0a 00 0a 00 13 07 _______7_#______
0010: 00 14 0a 00 02 00 13 0a 00 15 00 16 09 00 02 00 ________________
0020: 17 0a 00 15 00 18 09 00 02 00 19 0a 00 15 00 1a ________________
0030: 09 00 02 00 1b 07 00 1c 01 00 03 63 76 30 01 00 ___________cv0__
0040: 01 49 01 00 03 69 76 30 01 00 03 69 76 31 01 00 _I___iv0___iv1__
0050: 06 3c 69 6e 69 74 3e 01 00 03 28 29 56 01 00 04 _<init>___()V___
0060: 43 6f 64 65 01 00 04 6d 61 69 6e 0c 00 0f 00 10 Code___main_____
0070: 01 00 07 49 6e 73 74 56 61 72 07 00 1d 0c 00 1e ___InstVar______
0080: 00 1f 0c 00 0e 00 0c 0c 00 20 00 1f 0c 00 0b 00 _________ ______
0090: 0c 0c 00 21 00 22 0c 00 0d 00 0c 01 00 10 6a 61 ___!_"________ja
00a0: 76 61 2f 6c 61 6e 67 2f 4f 62 6a 65 63 74 01 00 va/lang/Object__
00b0: 0a 65 6a 33 32 2f 46 6f 72 74 68 01 00 05 63 6c _ej32/Forth___cl
00c0: 6f 63 6b 01 00 03 28 29 49 01 00 04 68 65 72 65 ock___()I___here
00d0: 01 00 05 64 65 6c 61 79 01 00 04 28 49 29 56 00 ___delay___(I)V_
00e0: 20 00 02 00 0a 00 00 00 03 00 08 00 0b 00 0c 00 _______________
00f0: 00 00 00 00 0d 00 0c 00 00 00 00 00 0e 00 0c 00 ________________
0100: 00 00 02 00 00 00 0f 00 10 00 01 00 11 00 00 00 ________________
0110: 11 00 01 00 01 00 00 00 05 2a b7 00 01 b1 00 00 _________*______
0120: 00 00 00 09 00 12 00 10 00 01 00 11 00 00 00 43 _______________C
0130: 00 03 00 02 00 00 00 37 bb 00 02 59 b7 00 03 4c _______7___Y___L
0140: 2b b8 00 04 b5 00 05 b8 00 06 b3 00 07 11 01 f4 +_______________
0150: b8 00 08 2b 59 b4 00 05 b8 00 04 64 b5 00 05 2b ___+Y______d___+
0160: 2b b4 00 05 74 5a b5 00 09 3b 1a b3 00 07 b1 00 +___tZ___;______
0170: 00 00 00 00 00 ff ff ff ff ff ff ff ff ff ff ff ________________
[01]000a:0a=>[a,13]
[02]000f:07=>14
[03]0012:0a=>[2,13]
[04]0017:0a=>[15,16]
[05]001c:09=>[2,17]
[06]0021:0a=>[15,18]
[07]0026:09=>[2,19]
[08]002b:0a=>[15,1a]
[09]0030:09=>[2,1b]
[0a]0035:07=>1c
[0b]0038:01=>cv0
[0c]003e:01=>I
[0d]0042:01=>iv0
[0e]0048:01=>iv1
[0f]004e:01=><init>
[10]0057:01=>()V
[11]005d:01=>Code
[12]0064:01=>main
[13]006b:0c=>[f,10]
[14]0070:01=>InstVar
[15]007a:07=>1d
[16]007d:0c=>[1e,1f]
[17]0082:0c=>[e,c]
[18]0087:0c=>[20,1f]
[19]008c:0c=>[b,c]
[1a]0091:0c=>[21,22]
[1b]0096:0c=>[d,c]
[1c]009b:01=>java/lang/Object
[1d]00ae:01=>ej32/Forth
[1e]00bb:01=>clock
[1f]00c3:01=>()I
[20]00c9:01=>here
[21]00d0:01=>delay
[22]00d8:01=>(I)V
class [2]InstVar : [a]java/lang/Object
p_intf=e7, p_attr=e9
sz_cls=4, sz_inst=8
n_method=2, p_method=103
[0f]<init>()V (5 bytes)
[12]main()V (37 bytes)
} loaded.
eJ32 v1 staring...
main() <-1|0 0> ok
j0138:bb new InstVar <-1|0 0 4> ok
j013b:59 dup <-1|0 0 4 4> ok
j013c:b7 invokespecial InstVar.<init>:()V $0 <-1 0 0 4|4> ok
j0119:2a aload_0 <-1 0 0 4|4 4> ok
j011a:b7 invokespecial java/lang/Object.<init>:()V $1 <-1 0 0 4|4> ok
j011d:b1 return <-1|0 0 4> ok
j013f:4c astore_1 <-1|0 4> ok
j0140:2b aload_1 <-1|0 4 4> ok
j0141:b8 invokestatic ej32/Forth.clock:()I $2 <-1|0 4 4 486461788> ok
j0144:b5 putfield InstVar.iv1:I $0 <-1|0 4> ok
j0147:b8 invokestatic ej32/Forth.here:()I $3 <-1|0 4 5562> ok
j014a:b3 putstatic InstVar.cv0:I $0 <-1|0 4> ok
j014d:11 sipush <-1|0 4 500> ok
j0150:b8 invokestatic ej32/Forth.delay:(I)V $4 **NA** <-1|0 4 500> ok
j0153:2b aload_1 <-1|0 4 500 4> ok
j0154:59 dup <-1|0 4 500 4 4> ok
j0155:b4 getfield $0 <-1|0 4 500 4 486461788> ok
j0158:b8 invokestatic $2 clock <-1|0 4 500 4 486461788 486461789> ok
j015b:64 isub <-1|0 4 500 4 -1> ok
j015c:b5 putfield $0 <-1|0 4 500> ok
j015f:2b aload_1 <-1|0 4 500 4> ok
j0160:2b aload_1 <-1|0 4 500 4 4> ok
j0161:b4 getfield $0 <-1|0 4 500 4 -1> ok
j0164:74 ineg <-1|0 4 500 4 1> ok
j0165:5a dup_x1 <-1|0 4 500 1 4 1> ok
j0166:b5 putfield InstVar.iv0:I $1 <-1|0 4 500 1> ok
j0169:3b istore_0 <-1|1 4 500> ok
j016a:1a iload_0 <-1|1 4 500 1> ok
j016b:b3 putstatic $0 <-1|1 4 500> ok
j016e:b1 return
eJ32 done.