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See generator/backend.cc for the implementation of writing the binary file
==========================================================================
string str = "hello";
int val = 12;
void main()
{
val += strlen(str);
}
------------------------------------------------------------------------
Binary file statistics:
strings at offset 0x0036
variables at offset 0x003c
filenames at offset 0x003e
code at offset 0x0014
first opcode at offset 0x0024
'code' starts with the code of all defined functions. The end of the 'code'
section defines the 'first opcode' location, where the initialization code of
the global variables is appended, which in turn is followed by the code
calling main, and a subsequent exit.
Variable section dump:
variable 0000: string
variable 0001: int
String constants dump:
[0036 (0000)] "hello"
Disassembled code:
[0014] 07 01 00 push global int [0001]
[0017] 07 00 00 push global string [0000]
[001a] 1b 23 callrss 23 (strlen)
[001c] 1c 01 add sp, 01
[001e] 08 push reg
[001f] 11 add
[0020] 09 01 00 pop global int [0001]
[0023] 23 ret
[0024] 06 00 00 push string "hello"
[0027] 09 00 00 pop global string [0000]
[002a] 05 0c 00 push int 000c
[002d] 09 01 00 pop global int [0001]
[0030] 21 14 00 call [0014]
[0033] 04 push int 0
[0034] 24 pop reg
[0035] 1d exit
---------------------------------------------------------------------------
0:version strings globvars filenames
--0--1--2--3--4--5--6--7--8--9--A--B--C--D--E--F-
00000000: 39 2E 30 33
36 00 00 00
3C 00 00 00
3E 00 00 00 9.036...<...>...
1st opcode: initializes the global variables, then prepares
for calling main, then pops main's reg and exits
1st function code byte starts at 14
--0--1--2--3--4--5--6--7--8--9--A--B--C--D--E--F-
00000010: 24 00 00 00
07 01 00 07 00 00 1B 23 1C 01 08 11 $..........#....
24: 1st opcode byte: initialization of global vars
--0--1--2--3--4--5--6--7--8--9--A--B--C--D--E--F-
00000020: 09 01 00 23
06 00 00 09 00 00 05 0C 00 09 01 00 ...#............
3c: global variable types
36: strings 3e: used filename(s)
--0--1--2--3--4--5--6--7--8--9--A--B--C--D--E--F-
00000030: 21 14 00 04 24 1D
68 65 6C 6C 6F 00
02 01 69 6E !...$.hello...in
00000040: 70 75 74 0A put.
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