Re: [v8-users] CFG

[Jakob Kummerow]

V8's new optimizing compiler, Turbofan, is not a CFG-based compiler.
--trace-turbo-scheduled is probably the closest equivalent it has to
dumping a CFG. You can also look at the other --trace-turbo* flags to see
if any of them suits your needs better.

On Fri, Mar 16, 2018 at 5:27 AM Thierry Sans  wrote:

> Hi,
>
> With v8, is it possible to compile *(but not execute) and dump the CFG
> (Control Flow Graph)? I know it was possible before with Hydrogen.
>
> Thanks.
>
>
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[v8-users] CFG

[Thierry Sans]

Hi,

With v8, is it possible to compile *(but not execute) and dump the CFG 
(Control Flow Graph)? I know it was possible before with Hydrogen. 

Thanks. 


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Re: [v8-users] ArrayBuffer::Allocator::Free() length differing from Allocate() length?

[Michael Lippautz]

Is that the exact implementation? v8::ArrayBuffer::Allocator is required to
be thread-safe [1] as V8 potentially (depends on the platform
implementation) offloads the freeing onto a different thread.

Cheers, -Michael

[1] https://cs.chromium.org/chromium/src/v8/include/v8.h?dr=CSs=4269


On Thu, Mar 15, 2018 at 2:36 AM 'Kenton Varda' via v8-users <
v8-users@googlegroups.com> wrote:

> Hi v8-users,
>
> We have an ArrayBufferAllocator implementation that counts how much memory
> has been allocated. It basically looks like this:
>
> class AllocatorImpl final: public v8::ArrayBuffer::Allocator {
>
> public:
>
>   AllocatorImpl(): allocated(0) {}
>
>   ~AllocatorImpl();
>
>
>   inline size_t getMemoryUsage() const { return allocated; }
>
>
>   void* Allocate(size_t length) {
>
> allocated += length;
>
> return calloc(length, 1);
>
>   }
>
>   void* AllocateUninitialized(size_t length) {
>
> allocated += length;
>
> return malloc(length);
>
>   }
>
>   void Free(void* data, size_t length) {
>
> allocated -= length;
>
> free(data);
>
>   }
>
>
> private:
>
>   size_t allocated;
>
> };
>
>
> We're observing something strange: Sometimes (very rarely!), the
> `allocated` value drops below zero and wraps around, apparently indicating
> that V8 has Free()'d more than it Allocate()ed. However, there don't seem
> to be any issues with double-frees or freeing an invalid pointer.
>
> Any idea what could lead to this? Is it possible for V8 to pass a
> different `legth` value to Free() than it passed to Allocate()?
>
> Unfortunately I have no idea how to reproduce this reliably. It only
> happens very occasionally in production. :/
>
> -Kenton
>
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