Thank Ben, but I need to some example:
function add(a, b) {
return a + b;
}
print(add(37, 73));
I execute this code via d8.
What is context in that case?
I've got the asm listing via --print-code: listing
<http://pastebin.com/NhWyhRDK>
Actually I can't understand why the listing consists so many codes? The
adder function is very simple.
0xda955b3eff6 150 49ba0000000025000000 REX.W movq r10,0x2500000000
0xda955b3f000 160 4152 push r10
0xda955b3f002 162 49ba0000000049000000 REX.W movq r10,0x4900000000
0xda955b3f00c 172 4152 push r10
0xda955b3f00e 174 48ba0000000007000000 REX.W movq rdx,0x700000000
0xda955b3f018 184 488b7c2418 REX.W movq rdi,[rsp+0x18]
0xda955b3f01d 189 e85efcffff call 0xda955b3ec80 ;; code:
CALL_IC, GENERIC
0xda955b3f022 194 488b75f8 REX.W movq rsi,[rbp-0x8]
0xda955b3f026 198 48890424 REX.W movq [rsp],rax
On Monday, February 15, 2016 at 11:14:58 PM UTC+6, Ben Noordhuis wrote:
>
> On Mon, Feb 15, 2016 at 1:57 PM, <[email protected] <javascript:>>
> wrote:
> > Hi all!
> >
> > I'm trying to understand the full-codegen compiler in v8.
> >
> > Ok, I've taken the full-codegen code for x64 architecture.
> >
> > As I can see in code, it does following things:
> > Build x64 frame
> > Allocate locals
> > And then allocate context <- this is magic for me
> >
> > The code's:
> >
> > // Possibly allocate a local context.
> >
> > if (info->scope()->num_heap_slots() > 0) {
> >
> > Comment cmnt(masm_, "[ Allocate context");
> >
> > bool need_write_barrier = true;
> >
> > int slots = info->scope()->num_heap_slots() -
> > Context::MIN_CONTEXT_SLOTS;
> >
> > // Argument to NewContext is the function, which is still in rdi.
> >
> > ...
> >
> >
> > What does the full-codegen does here?
>
> The context it allocates is the storage for a function's free
> variables. V8's garbage collector is generational; the write barrier
> is for tracking object references from the old space to the new space.
>
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