But after using it for a little while, I have found v8 in general is pretty simple. It provides an interface to C functions and memory. This is kinda what it's for.
so how can i see the memory management ? Il giorno lun 10 set 2018 alle ore 23:06 dan Med <litokis.ta...@gmail.com> ha scritto: > So, the hole length of this raw memory is set to be Data ? And to use it i > should create a view on top of it like with typedarrays? > > > So to call arraybuffer::append i should first, try to make the typed array > bigger that action will call the arraybuffer::append ? i didn't ask how > memcpy work, i didn't get the Data() thing, in the class that's all. > > Il giorno lun 10 set 2018 alle ore 22:55 @soylentgraham < > gra...@grahamreeves.com> ha scritto: > >> > How can i understand the structure in memory of an arraybuffer and how big >> > is the data field which is pointed by this void pointerIt has no >> > structure. It is just a series of linear bytes, raw memory, allocated by >> > the memory allocator. (If you implement your own memory allocator you can >> > catch when this happens)It's just the data(buffer) for an array. >> > How are they represented in memory....It IS memory. It's nothing more >> > (it's an array of bytes) >> > How big is the data field ?If by "field", you mean, the data buffer... >> > it's Capacity >> > <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=76&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523kB%25252BJ1WxDvoDqf1c8Tz5Ol3yne4lD03cRpevK2LHMUZk%25253D&gsn=Capacity&ct=xref_usages> >> > (capacity is how much it can fit) in length. But not how much is being >> > used. (bytes_used) >> If you're curious about when memory grows, reallocates, is written to, >> accessed... it might be worth setting up your environment so you can debug >> it by stepping through the code as it executes. You can watch memory, (this >> would show what memcpy changes) see the values passed around, track when >> memory gets allocated etc. >> Your questions are a mix of very broad, ("How does v8 work") and very >> specific programming questions (what is memcpy() doing)Broad questions are >> very hard to answer in general. ("How does a car work") >> >> I agree, simply browsing the code doesn't give a good overview of say, how >> the javascript compiler works, or how memory is utilised. (How it is >> allocated is very simple, on the C/++ side it doesn't implement any memory >> management, and the array buffer/view is a view of the C-side memory)But >> after using it for a little while, I have found v8 in general is pretty >> simple. It provides an interface to C functions and memory. This is kinda >> what it's for. >> But the point of v8 is that it does a lot of that for you. I don't REALLY >> need to know how the memory is tracked on the javascript side, it just works >> (if I'm using the API correctly)Then again, if you NEED to know how it works >> for a specific purpose (very restricted memory, fixing a bug), we can help >> you a lot more easily by answering a very specific question. ("My car's >> low-oil light is blinking, where do I fill it up") >> If you're just curious as to how the entire v8 engine works... that's a >> massive ask. A lot of people work on it, and there is a lot of work and >> topics involved.Your best bet is reading the (limited) documentation on the >> wiki, and read the blog posts https://v8project.blogspot.com/ which go into >> quite a lot of detail on each post topic.I've not seen any real general >> overview (the wiki itself says it's out of date) so, stepping through all >> the code as it executes is probably your best bet. >> >> >> On Monday, 10 September 2018 21:25:37 UTC+1, dan Med wrote: >>> >>> in this snippet for example >>> >>> namespace WTF >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=40&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%2523WTF%252523n%252523namespace&gsn=WTF&ct=xref_usages> >>> {// A utility class to build an ArrayBuffer instance. Validity must be >>> checked// by isValid() before using an instance.class WTF_EXPORT >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/wtf_export.h?l=46&ct=xref_jump_to_def&gsn=WTF_EXPORT> >>> ArrayBufferBuilder >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=44&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523ArrayBufferBuilder%25253AWTF%252523c%252523hTnYOn1mFcU%2Bkythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523NyhHD05MjDx8XOe1m%25252BLqXBLvqdjWPsLmDrRvvmR2Ywk%25253D&gsn=ArrayBufferBuilder&ct=xref_usages> >>> final { // Disallow copying since it's expensive and we don't want code >>> to do it by // accident. USING_FAST_MALLOC >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/allocator.h?l=146&ct=xref_jump_to_def&gsn=USING_FAST_MALLOC>(ArrayBufferBuilder >>> >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=44&ct=xref_jump_to_def&gsn=ArrayBufferBuilder>); >>> public: // Creates an ArrayBufferBuilder using the default capacity. >>> ArrayBufferBuilder >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=51&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523me5JBk4wDIaIJCK86MiUpy%25252BnGYRZwEr0AvVg3KaU0pw%25253D&gsn=ArrayBufferBuilder&ct=xref_usages>(); >>> ArrayBufferBuilder >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=53&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523VW0P45Tk9IGjtOqM%25252B9dHdJ64so3WDAfcY1jNBLt0GNY%25253D&gsn=ArrayBufferBuilder&ct=xref_usages>(unsigned >>> capacity >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=53&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523trfcCH7BPCRWiubGq1QF9bypkCRNYtWGHb2AzglMces%25253D&gsn=capacity&ct=xref_usages>) >>> : bytes_used_ >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=92&ct=xref_jump_to_def&gsn=bytes_used_>(0), >>> variable_capacity_ >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=93&ct=xref_jump_to_def&gsn=variable_capacity_>(true) >>> { buffer_ >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=94&ct=xref_jump_to_def&gsn=buffer_> >>> = >>> <https://cs.chromium.org/chromium/src/base/memory/scoped_refptr.h?l=226&ct=xref_jump_to_def&gsn=%3D> >>> ArrayBuffer >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer.h?l=42&ct=xref_jump_to_def&gsn=ArrayBuffer>::Create >>> >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer.h?l=125&ct=xref_jump_to_def&gsn=Create>(capacity >>> >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=53&ct=xref_jump_to_def&gsn=capacity>, >>> 1); } bool IsValid >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=58&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523Bx72YH%25252BiA4nF5ZIPsFhA9MQpdVCDOCRHSZa0Ksg6Wp4%25253D&gsn=IsValid&ct=xref_usages>() >>> const { return buffer_ >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=94&ct=xref_jump_to_def&gsn=buffer_>.get >>> >>> <https://cs.chromium.org/chromium/src/base/memory/scoped_refptr.h?l=211&ct=xref_jump_to_def&gsn=get>(); >>> } // Appending empty data is not allowed. unsigned Append >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=61&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523BHKR8BlIFhr03faCJF5mu7RDXZ%25252FPtZDAlnACyKmv1XM%25253D&gsn=Append&ct=xref_usages>(const >>> char* data >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=61&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%25233VvJP%25252BUI3abzouA4%25252FYSBHt09pw3AiNI9e9QAJGooqYI%25253D&gsn=data&ct=xref_usages>, >>> unsigned length >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=61&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523xOZXOK9mCrzsbUtqCxdbDuLg939IJhl7gbf0EykKwnY%25253D&gsn=length&ct=xref_usages>); >>> // Returns the accumulated data as an ArrayBuffer instance. If needed, >>> // creates a new ArrayBuffer instance and copies contents from the internal >>> // buffer to it. Otherwise, returns a RefPtr pointing to the internal // >>> buffer. scoped_refptr >>> <https://cs.chromium.org/chromium/src/base/memory/scoped_refptr.h?l=167&ct=xref_jump_to_def&gsn=scoped_refptr><ArrayBuffer >>> >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer.h?l=42&ct=xref_jump_to_def&gsn=ArrayBuffer>> >>> ToArrayBuffer >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=67&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523JX559OA9Zt0rALNU4DOTOkzcmtws4U5V42xhN0rrbow%25253D&gsn=ToArrayBuffer&ct=xref_usages>(); >>> // Converts the accumulated data into a String using the default >>> encoding. String >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/text/wtf_string.h?l=64&ct=xref_jump_to_def&gsn=String> >>> ToString >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=70&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523VMCyw7t%25252FF0UIo65pz8LTbfX5k5G4pIXrUNQbDNKDjaE%25253D&gsn=ToString&ct=xref_usages>(); >>> // Number of bytes currently accumulated. unsigned ByteLength >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=73&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523P5Klo%25252BJeJiug%25252FrSAfsaHI8wAnW8h5UBg2%25252BoJByO85kA%25253D&gsn=ByteLength&ct=xref_usages>() >>> const { return bytes_used_ >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=92&ct=xref_jump_to_def&gsn=bytes_used_>; >>> } // Number of bytes allocated. unsigned Capacity >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=76&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523kB%25252BJ1WxDvoDqf1c8Tz5Ol3yne4lD03cRpevK2LHMUZk%25253D&gsn=Capacity&ct=xref_usages>() >>> const { return buffer_ >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=94&ct=xref_jump_to_def&gsn=buffer_>-> >>> >>> <https://cs.chromium.org/chromium/src/base/memory/scoped_refptr.h?l=218&ct=xref_jump_to_def&gsn=-%3E>ByteLength >>> >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer.h?l=249&ct=xref_jump_to_def&gsn=ByteLength>(); >>> } void ShrinkToFit >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=78&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523WBvAUuWtgva6ffSXIiEGEkt%25252FFFbeCcQcsCz5E%25252FHCKOo%25253D&gsn=ShrinkToFit&ct=xref_usages>(); >>> const void* Data >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=80&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523b8F1aEDx%25252F6En%25252FkOKh2zVkvONjtDNg9gr5KG7gT9XeJk%25253D&gsn=Data&ct=xref_usages>() >>> const { return buffer_ >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=94&ct=xref_jump_to_def&gsn=buffer_>-> >>> >>> <https://cs.chromium.org/chromium/src/base/memory/scoped_refptr.h?l=218&ct=xref_jump_to_def&gsn=-%3E>Data >>> >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer.h?l=225&ct=xref_jump_to_def&gsn=Data>(); >>> } // If set to false, the capacity won't be expanded and when appended >>> data // overflows, the overflowed part will be dropped. void >>> SetVariableCapacity >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=84&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%25232ib6USbezkKcLs8hjPaCz4GUGrUHdD%25252BeN%25252FKenERnRLA%25253D&gsn=SetVariableCapacity&ct=xref_usages>(bool >>> value >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=84&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523vUjrriXMW5FurGjU87jcAlZRQs3b8JSgA4Tt1xrSq7I%25253D&gsn=value&ct=xref_usages>) >>> { variable_capacity_ >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=93&ct=xref_jump_to_def&gsn=variable_capacity_> >>> = value >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=84&ct=xref_jump_to_def&gsn=value>; >>> } private: // Expands the size of m_buffer to size + m_bytesUsed bytes. >>> Returns true // iff successful. If reallocation is needed, copies only >>> data in // [0, m_bytesUsed) range. bool ExpandCapacity >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=90&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523szv9AYLlP3J7qhn%25252Fm%25252BJqzPmSgWf45%25252BRVwVxvXDk3WYQ%25253D&gsn=ExpandCapacity&ct=xref_usages>(unsigned >>> size >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=90&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523mXwymG5xtblCCeS4C9QcnmOwJxql8nYDr2HLqNZVJ8I%25253D&gsn=size&ct=xref_usages>); >>> unsigned bytes_used_ >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=92&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523x95FyaH%25252BSeW1SF4BFhX9oIq7qgtHy3xzXCMmc37LcL8%25253D&gsn=bytes_used_&ct=xref_usages>; >>> bool variable_capacity_ >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=93&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523FKWGJXbcZ%25252BRuy6YD7uxQ765XV8Mhciv4FM%25252FF5B3bNvU%25253D&gsn=variable_capacity_&ct=xref_usages>; >>> scoped_refptr >>> <https://cs.chromium.org/chromium/src/base/memory/scoped_refptr.h?l=167&ct=xref_jump_to_def&gsn=scoped_refptr><ArrayBuffer >>> >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer.h?l=42&ct=xref_jump_to_def&gsn=ArrayBuffer>> >>> buffer_ >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=94&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523aFDjYtlmS2tmLXL2XyJ158HoigBmsAdzguhOSb6XQIw%25253D&gsn=buffer_&ct=xref_usages>; >>> DISALLOW_COPY_AND_ASSIGN >>> <https://cs.chromium.org/chromium/src/base/macros.h?l=33&ct=xref_jump_to_def&gsn=DISALLOW_COPY_AND_ASSIGN>(ArrayBufferBuilder >>> >>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=96&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.h%2523E6nSXqAY3ipexrHDKPfjzHqWqWIsAlT3EH3KVhT57GQ%25253D&gsn=ArrayBufferBuilder&ct=xref_usages>);};} >>> // namespace WTF >>> >>> >>> >>> How can i understand the structure in memory of an arraybuffer and how big >>> is the data field which is pointed by this void pointerHow are they >>> represented in memory....How big is the data field ? >>> >>> >>> Il giorno lun 10 set 2018 alle ore 22:19 dan Med <litoki...@gmail.com> >>> ha scritto: >>> >>>> i already did that and btw it is under the WTF/webkit . >>>> I'm interested how v8 handles javascript into every detail if u can >>>> guide me... >>>> Tell me which repository are being used by v8 on the related topic that >>>> would help me really much. >>>> >>>> By when it is called i mean, which javascript code will enable me to >>>> call that funciton cause if u click u can't go any further than that, >>>> >>>> Il giorno lun 10 set 2018 alle ore 21:53 Jakob Kummerow < >>>> jkum...@chromium.org> ha scritto: >>>> >>>>> On Mon, Sep 10, 2018 at 12:22 PM dan Med <litoki...@gmail.com> wrote: >>>>> >>>>>> I don't quite see if this google group is useful or not, everybody >>>>>> keeps answering me with superficial things, >>>>>> >>>>> >>>>> You said you wanted to read the compiler's source but couldn't find >>>>> it, so I told you that it's in src/compiler/. If that was not the answer >>>>> you wanted, then try asking a different question? >>>>> >>>>> Please also keep in mind that people's time is limited. The >>>>> easier/quicker it is to answer your question, the more likely you are to >>>>> get an answer. >>>>> >>>>> i don't care about the trminology like tell me which allocator it uses >>>>>> when and why or at least if there's something i can read to >>>>>> understand..... >>>>>> I'm surprised u don't know what a JIT page is, basically if you call >>>>>> a function foo() let's say 100 times then v8,had enough time to >>>>>> understand >>>>>> the parameters given to that specific function and how to optimize it >>>>>> efficently based on it's prediction/observation. >>>>>> >>>>>> I'm not interested in the terminology of things, (that's just a >>>>>> matter of reading the source code ) i'm more in reading how it works when >>>>>> and why.. >>>>>> >>>>> >>>>> It's great that you want to understand how things work. Terminology is >>>>> an important aspect of that though, because it enables communication. If >>>>> we >>>>> use different words for the same thing, we won't understand each other. >>>>> Based on your explanation, I'm guessing that by "JIT page" you mean >>>>> "the strategy V8 uses to select functions for optimization". The core of >>>>> that logic is in MarkCandidatesForOptimization in src/runtime-profiler.cc. >>>>> >>>>> >>>>>> For example when is ArrayBufferBuilder::Append called ?? >>>>>> >>>>> >>>>> I don't know; it's not part of V8. But you can use Code Search to find >>>>> out where anything is called, just click the function in question to get a >>>>> list of call sites: >>>>> https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?q=ArrayBufferBuilder&sq=package:chromium&g=0&l=61 >>>>> >>>>> >>>>>> And i thing i've looked at the entire v8 source code but didn't find >>>>>> much, apart from the array.js file which describes some javascript >>>>>> function, i don't understand where's the rest.... >>>>>> >>>>> >>>>> >>>>> Il giorno lun 10 set 2018 alle ore 20:45 Jakob Kummerow < >>>>>> jkum...@chromium.org> ha scritto: >>>>>> >>>>>>> On Sun, Sep 9, 2018 at 8:54 AM dan Med <litoki...@gmail.com> wrote: >>>>>>> >>>>>>>> Oh and one more thing, i've surfed perhaps the entire source code >>>>>>>> of v8 at least the interesting parts, but what i came across was just >>>>>>>> very >>>>>>>> short code execpt for some builtins written in javascript i believe, >>>>>>>> can't >>>>>>>> find all of the things i've found on the documentation such as the >>>>>>>> interpreter >>>>>>>> >>>>>>> >>>>>>> src/interpreter/ >>>>>>> >>>>>>> >>>>>>>> and the JIT compilers, >>>>>>>> >>>>>>> >>>>>>> src/compiler/ >>>>>>> >>>>>>> >>>>>>>> one more thing i'd like to understand how the memory is handeled >>>>>>>> like how can i read about the JIT pages, >>>>>>>> >>>>>>> >>>>>>> What's a JIT page? >>>>>>> >>>>>>> >>>>>>>> or which memory allocator does v8 use >>>>>>>> >>>>>>> >>>>>>> It uses several allocation techniques for different purposes. >>>>>>> >>>>>>> >>>>>>>> and it's garbage collector >>>>>>>> >>>>>>> >>>>>>> src/heap/ >>>>>>> >>>>>>> >>>>>>>> >>>>>>>> Thank you ! >>>>>>>> >>>>>>>> Il giorno dom 9 set 2018 alle ore 17:51 dan Med < >>>>>>>> litoki...@gmail.com> ha scritto: >>>>>>>> >>>>>>>>> I don't have understood this part, let me explain it to you. >>>>>>>>> This is how i get it tell me if i'm wrong at any part. >>>>>>>>> >>>>>>>>> I need to understand how is the structure in memory of the >>>>>>>>> arraybuffer how is it represented and if the data of the array are >>>>>>>>> directly >>>>>>>>> stored at an offset accessed by buffer_ -> data(). >>>>>>>>> >>>>>>>>> >>>>>>>>> before the call to expand capacity it does create an array >>>>>>>>> >>>>>>>>> >>>>>>>>> the arraybuffer in src <https://cs.chromium.org/chromium/src/>/ >>>>>>>>> third_party <https://cs.chromium.org/chromium/src/third_party/>/ >>>>>>>>> blink <https://cs.chromium.org/chromium/src/third_party/blink/>/ >>>>>>>>> renderer >>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/> >>>>>>>>> /platform >>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/> >>>>>>>>> /wtf >>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/> >>>>>>>>> /typed_arrays >>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/> >>>>>>>>> /array_buffer_builder.cc >>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.cc> >>>>>>>>> is >>>>>>>>> called whenever the renderer (has to execute some javascript which >>>>>>>>> defines >>>>>>>>> arraybuffers) >>>>>>>>> First when is arraybuffer::append called, cause i know that if >>>>>>>>> someone need to reallocate a bigger arraybuffer then a new instance >>>>>>>>> will be >>>>>>>>> created and filled with the old values if the length in the original >>>>>>>>> array >>>>>>>>> isn't has much as the user reqeusted ? >>>>>>>>> >>>>>>>>> One more thing is, when this class is called, the arraybuffer is >>>>>>>>> always set to the initial length of static const int >>>>>>>>> kDefaultBufferCapacity >>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.cc?l=38&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.cc%2523YXDT7WTpXCAcuhdyTlkuCzsfCzI%25252BoHLRFAlkbCrkx4g%25253D&gsn=kDefaultBufferCapacity&ct=xref_usages> >>>>>>>>> = 32768; if in the javascript i declare an arraybuffer of 20bytes >>>>>>>>> will it allocate of >>>>>>>>> 32768bytes anyway =? >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> Il giorno mar 4 set 2018 alle ore 12:14 Graham Reeves < >>>>>>>>> gra...@grahamreeves.com> ha scritto: >>>>>>>>> >>>>>>>>>> > is std::numeric_limits >>>>>>>>>> <https://cs.chromium.org/chromium/src/buildtools/third_party/libc%2B%2B/trunk/include/limits?l=442&ct=xref_jump_to_def&gsn=numeric_limits> >>>>>>>>>> <unsigned>::max >>>>>>>>>> <https://cs.chromium.org/chromium/src/buildtools/third_party/libc%2B%2B/trunk/include/limits?l=450&ct=xref_jump_to_def&gsn=max>(); >>>>>>>>>> referring to the max unsigned int value ? cause the source code >>>>>>>>>> won't find >>>>>>>>>> it >>>>>>>>>> Yes, that's the maximum value unsigned (an unsigned int) can be, >>>>>>>>>> but what do you mean by, the source won't find it? >>>>>>>>>> >>>>>>>>>> On Monday, 3 September 2018 19:55:48 UTC+1, dan Med wrote: >>>>>>>>>>> >>>>>>>>>>> Can someone help me out? >>>>>>>>>>> >>>>>>>>>>> Il giorno sab 1 set 2018 alle ore 15:30 <litoki...@gmail.com> >>>>>>>>>>> ha scritto: >>>>>>>>>>> >>>>>>>>>>>> array_buffer_builder.cc in src >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/>/third_party >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/>/blink >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/>/ >>>>>>>>>>>> renderer >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/> >>>>>>>>>>>> /platform >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/> >>>>>>>>>>>> /wtf >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/> >>>>>>>>>>>> /typed_arrays >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/> >>>>>>>>>>>> /array_buffer_builder.cc >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.cc> >>>>>>>>>>>> >>>>>>>>>>>> the ArrayBufferBuilder >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=44&ct=xref_jump_to_def&gsn=ArrayBufferBuilder> >>>>>>>>>>>> ::Append >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.cc?l=74&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.cc%2523NFGzJegTouRzc7WYe5NO52sD3rtLZRfs3mHeMLIQn8I%25253D&gsn=Append&ct=xref_usages> >>>>>>>>>>>> method >>>>>>>>>>>> will be called through a view on top of the arraybuffer? something >>>>>>>>>>>> like, >>>>>>>>>>>> there's a arraybuffer of 30bytes in length and we define a view on >>>>>>>>>>>> top of >>>>>>>>>>>> it (so a typedarray) wehn i call on the new typedarray object the >>>>>>>>>>>> .append >>>>>>>>>>>> method it will call ArrayBufferBuilder >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=44&ct=xref_jump_to_def&gsn=ArrayBufferBuilder> >>>>>>>>>>>> ::Append >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.cc?l=74&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.cc%2523NFGzJegTouRzc7WYe5NO52sD3rtLZRfs3mHeMLIQn8I%25253D&gsn=Append&ct=xref_usages> >>>>>>>>>>>> and then inside it's code it will execute ArrayBufferBuilder >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=44&ct=xref_jump_to_def&gsn=ArrayBufferBuilder> >>>>>>>>>>>> ::ExpandCapacity >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.cc?l=45&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.cc%2523Fu6GnwJLuMqh5Thz%25252BDq0LStBEA8HzkICqnAPtIOPIhY%25253D&gsn=ExpandCapacity&ct=xref_usages> >>>>>>>>>>>> if >>>>>>>>>>>> it needs to reallocate the array ? >>>>>>>>>>>> >>>>>>>>>>>> if so inside the expandCapacity definition bytes_used >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=92&ct=xref_jump_to_def&gsn=bytes_used_> >>>>>>>>>>>> referes >>>>>>>>>>>> to the elements inside the actual arraybuffer so if i have a >>>>>>>>>>>> arraybuffer >>>>>>>>>>>> which is 8 bytes in length [ ][ ][ ][ ][ ][ ][ ][ ] and i fill in >>>>>>>>>>>> only 3 >>>>>>>>>>>> bytes so >>>>>>>>>>>> [1][2][3][ ][ ][ ][ ][ ] the bytes_used >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=92&ct=xref_jump_to_def&gsn=bytes_used_> >>>>>>>>>>>> when >>>>>>>>>>>> retrieved will be set to 3 bytes ?? >>>>>>>>>>>> >>>>>>>>>>>> ArrayBufferBuilder >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=44&ct=xref_jump_to_def&gsn=ArrayBufferBuilder>::ArrayBufferBuilder >>>>>>>>>>>> >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.cc?l=40&gs=kythe%253A%252F%252Fchromium%253Flang%253Dc%25252B%25252B%253Fpath%253Dsrc%252Fthird_party%252Fblink%252Frenderer%252Fplatform%252Fwtf%252Ftyped_arrays%252Farray_buffer_builder.cc%2523lcp23D0sHKN2WnDoJe7UbBQtgQbZY3lJ%25252Bn9qnDlawck%25253D&gsn=ArrayBufferBuilder&ct=xref_usages>() >>>>>>>>>>>> : bytes_used_ >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=92&ct=xref_jump_to_def&gsn=bytes_used_>(0), >>>>>>>>>>>> variable_capacity_ >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=93&ct=xref_jump_to_def&gsn=variable_capacity_>(true) >>>>>>>>>>>> { buffer_ >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_builder.h?l=94&ct=xref_jump_to_def&gsn=buffer_> >>>>>>>>>>>> = >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/base/memory/scoped_refptr.h?l=226&ct=xref_jump_to_def&gsn=%3D> >>>>>>>>>>>> ArrayBuffer >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer.h?l=42&ct=xref_jump_to_def&gsn=ArrayBuffer>:: >>>>>>>>>>>> >>>>>>>>>>>> <https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer.h?l=125&ct=xref_jump_to_def&gsn=Create> >>>>>>>>>>>> >>>>>>>>>>>> -- -- v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users --- You received this message because you are subscribed to the Google Groups "v8-users" group. 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