Implement Write Barrier and dsize for FFI::Pointer#1010
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As well as FFI::MemoryPointer and FFI::AbstractMemory Write barrier protected objects are allowed to be promoted to the old generation, which means they only get marked on major GC. The downside is that the RB_BJ_WRITE macro MUST be used to set references, otherwise the referenced object may be garbaged collected. This commit also implement a dsize function so that these instance report a more relevant size in various memory profilers.
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I added FFI::Buffer as well, as it's mostly the same code. |
larskanis
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This disables AbstractMemory.new, which has no practical use. As discussed in ffi#1010
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Probably no. I couldn't find any use of |
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Ref: #991
As well as FFI::MemoryPointer and FFI::AbstractMemory
Write barrier protected objects are allowed to be promoted to the old generation, which means they only get marked on major GC.
The downside is that the RB_BJ_WRITE macro MUST be used to set references, otherwise the referenced object may be garbaged collected.
This commit also implement a dsize function so that these instance report a more relevant size in various memory profilers.
@larskanis I'm curious whether
FFI::AbstractMemory.newis ever meant to be used? If I make it raise no test fail, and I really don't see what the usage would be.I'm tempted to just undefine the allocation function.