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``jit_dump`` for ``require('jit.dump')``.
Name
Use
:ref:`jit_bc.dump() <jit-bc-dump>`
Print the byte code of a function
:ref:`jit_dis_x86.disass() <jit-dis-x86-disass>`
Print the i386 assembler code of a string of bytes
:ref:`jit_dis_x64.disass() <jit-dis-x64-disass>`
Print the x86-64 assembler code of a string of bytes
:ref:`jit_dump.on() <jit-dump-on>`, :ref:`jit_dump.off() <jit-dump-off>`
Print the intermediate or machine code of the following Lua code
:ref:`jit_v.on() <jit-v-on>`, :ref:`jit_v.off() <jit-v-off>`
Print a trace of LuaJIT's progress compiling and interpreting code
Prints the byte code of a function.
**Example:**
tarantool> jit_bc = require('jit.bc')
---
...

tarantool> function f()
> print("D")
> end
---
...

tarantool> jit_bc.dump(f)
-- BYTECODE -- 0x01113163c8:1-3
0001 GGET 0 0 ; "print"
0002 KSTR 2 1 ; "D"
0003 CALL 0 1 2
0004 RET0 0 1

---
...
function f()
print("D")
end
require('jit.bc').dump(f)
For a list of available options, read `the source code of bc.lua <https://github.com/tarantool/luajit/tree/tarantool-1.7/src/jit/bc.lua>`_.
Prints the i386 assembler code of a string of bytes.
tarantool> -- Disassemble hexadecimal 97 which is the x86 code for xchg eax, edi
---
...

tarantool> jit_dis_x86 = require('jit.dis_x86')
---
...

tarantool> jit_dis_86.disass('\x97')
00000000 97 xchg eax, edi
---
...
For a list of available options, read `the source code of dis_x86.lua <https://github.com/tarantool/luajit/tree/tarantool-1.7/src/jit/dis_x86.lua>`_.
Prints the x86-64 assembler code of a string of bytes.
tarantool> -- Disassemble hexadecimal 97 which is the x86-64 code for xchg eax, edi
---
...

tarantool> jit_dis_x64 = require('jit.dis_x64')
---
...

tarantool> jit_dis_64.disass('\x97')
00000000 97 xchg eax, edi
---
...
For a list of available options, read `the source code of dis_x64.lua <https://github.com/tarantool/luajit/tree/tarantool-1.7/src/jit/dis_x64.lua>`_.
Prints the intermediate or machine code of the following Lua code.
tarantool> -- Show the machine code of a Lua "for" loop
tarantool> jit_dump = require('jit.dump')
tarantool> jit_dump.on('m')
tarantool> x = 0;
tarantool> for i = 1, 1e6 do
> x = x + i
> end
---- TRACE 1 start 0x01047fbc38:1
---- TRACE 1 mcode 148
104c29f6b mov dword [r14-0xed0], 0x1
104c29f76 cvttsd2si ebp, [rdx]
104c29f7a rorx rbx, [rdx-0x10], 0x2f
104c29f81 shr rbx, 0x11
104c29f85 mov rdx, [rbx+0x10]
104c29f89 cmp dword [rdx+0x34], +0x3f
104c29f8d jnz 0x104c1a010 ->0
104c29f93 mov rcx, [rdx+0x28]
104c29f97 mov rdi, 0xfffd8001046b3d58
104c29fa1 cmp rdi, [rcx+0x320]
104c29fa8 jnz 0x104c1a010 ->0
104c29fae lea rax, [rcx+0x318]
104c29fb5 cmp dword [rax+0x4], 0xfff90000
104c29fbc jnb 0x104c1a010 ->0
104c29fc2 xorps xmm7, xmm7
104c29fc5 cvtsi2sd xmm7, ebp
104c29fc9 addsd xmm7, [rax]
104c29fcd movsd [rax], xmm7
104c29fd1 add ebp, +0x01
104c29fd4 cmp ebp, 0x000f4240
104c29fda jg 0x104c1a014 ->1
->LOOP:
104c29fe0 xorps xmm6, xmm6
104c29fe3 cvtsi2sd xmm6, ebp
104c29fe7 addsd xmm7, xmm6
104c29feb movsd [rax], xmm7
104c29fef add ebp, +0x01
104c29ff2 cmp ebp, 0x000f4240
104c29ff8 jle 0x104c29fe0 ->LOOP
104c29ffa jmp 0x104c1a01c ->3
---- TRACE 1 stop -> loop

---
...

tarantool> print(x)
500000500000
---
...

tarantool> jit_dump.off()
---
...
For a list of available options, read `the source code of dump.lua <https://github.com/tarantool/luajit/tree/tarantool-1.7/src/jit/dump.lua>`_.
Prints a trace of LuaJIT's progress compiling and interpreting code.
tarantool> -- Show what LuaJIT is doing for a Lua "for" loop
tarantool> jit_v = require('jit.v')
tarantool> jit_v.on()
tarantool> l = 0
tarantool> for i = 1, 1e6 do
> l = l + i
> end
[TRACE 3 "for i = 1, 1e6 do
l = l + i
end":1 loop]
---
...

tarantool> print(l)
500000500000
---
...

tarantool> jit_v.off()
---
...
For a list of available options, read `the source code of v.lua <https://github.com/tarantool/luajit/tree/tarantool-1.7/src/jit/v.lua>`_.

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testing_project / Documentation: reference/reference_lua/jit — English

tarantool> jit_bc = require('jit.bc')
---
...

tarantool> function f()
> print("D")
> end
---
...

tarantool> jit_bc.dump(f)
-- BYTECODE -- 0x01113163c8:1-3
0001 GGET 0 0 ; "print"
0002 KSTR 2 1 ; "D"
0003 CALL 0 1 2
0004 RET0 0 1

---
...
a year ago
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