Re: [v8-users] Re: View assembly code for built in functions

2017-09-18 Thread Jakob Kummerow 
ArrayPush is implemented in C++, see src/builtins/builtins-array.cc. The
code object you've disassembled is a small wrapper/trampoline stub, the
first step in the C++ entry sequence.

In general, there is no single way to inspect "built-in functions", because
there are several ways to implement them (a few are still in handwritten
assembly; many are in C++ [exposed as "runtime functions" or "builtins"]
and CodeStubAssembler; some are in JavaScript), and that implies different
ways to dump their code. Many functions also have several implementations,
e.g. a fast path in a generated stub (FastArrayPush is an example), with a
C++ fallback for non-fast cases.

On Mon, Sep 18, 2017 at 5:40 AM, Rong Jie  wrote:

> You need to build V8 with v8_enable_disassembler enabled (disabled by
> default in release build). See https://cs.chromium.org/
> chromium/src/v8/BUILD.gn?type=cs=v8_enable_disassembler
>
>
> On Monday, September 18, 2017 at 5:23:09 PM UTC+8, Marija wrote:
>>
>> Hi,
>>
>> Is it possible to see generated assembly code for built-in functions? If
>> I use just print_code with a simple program, like [].push(1), nothing is
>> generated.
>> Is --print_builtin_code flag the right thing to use? For array push the
>> output looks like:
>>
>> kind = BUILTIN
>> name = ArrayPush
>> compiler = unknown
>> Instructions (size = 10)
>> 0x246f7340 0  bb20c45908 mov ebx,0x859c420   ;; external
>> reference (Builtin_ArrayPush)
>> 0x246f7345 5  e9f682feff jmp 0x246df640
>>  (AdaptorWithBuiltinExitFrame);; code: BUILTIN
>>
>>
>> RelocInfo (size = 3)
>> 0x246f7341  external reference (Builtin_ArrayPush)  (0x859c420)
>> 0x246f7346  code target (BUILTIN)  (0x246df640)
>>
>> There is another code for FastArrayPush.
>>
>> Can you also help me to understand the output if the flag
>> --print_builtin_code is the right thing to use?
>>
>> Thanks!
>>
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[v8-users] Re: View assembly code for built in functions

2017-09-18 Thread Rong Jie 
You need to build V8 with v8_enable_disassembler enabled (disabled by 
default in release build). See 
https://cs.chromium.org/chromium/src/v8/BUILD.gn?type=cs=v8_enable_disassembler

On Monday, September 18, 2017 at 5:23:09 PM UTC+8, Marija wrote:
>
> Hi,
>
> Is it possible to see generated assembly code for built-in functions? If I 
> use just print_code with a simple program, like [].push(1), nothing is 
> generated.
> Is --print_builtin_code flag the right thing to use? For array push the 
> output looks like:
>
> kind = BUILTIN
> name = ArrayPush
> compiler = unknown
> Instructions (size = 10)
> 0x246f7340 0  bb20c45908 mov ebx,0x859c420   ;; external 
> reference (Builtin_ArrayPush)
> 0x246f7345 5  e9f682feff jmp 0x246df640 
>  (AdaptorWithBuiltinExitFrame);; code: BUILTIN
>
>
> RelocInfo (size = 3)
> 0x246f7341  external reference (Builtin_ArrayPush)  (0x859c420)
> 0x246f7346  code target (BUILTIN)  (0x246df640)
>
> There is another code for FastArrayPush. 
>
> Can you also help me to understand the output if the flag 
> --print_builtin_code is the right thing to use?
>
> Thanks!
>

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