mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-05 01:52:46 +00:00
53 lines
1.8 KiB
Go
53 lines
1.8 KiB
Go
package experimental
|
|
|
|
import (
|
|
"context"
|
|
|
|
"github.com/tetratelabs/wazero/internal/expctxkeys"
|
|
)
|
|
|
|
// MemoryAllocator is a memory allocation hook,
|
|
// invoked to create a LinearMemory.
|
|
type MemoryAllocator interface {
|
|
// Allocate should create a new LinearMemory with the given specification:
|
|
// cap is the suggested initial capacity for the backing []byte,
|
|
// and max the maximum length that will ever be requested.
|
|
//
|
|
// Notes:
|
|
// - To back a shared memory, the address of the backing []byte cannot
|
|
// change. This is checked at runtime. Implementations should document
|
|
// if the returned LinearMemory meets this requirement.
|
|
Allocate(cap, max uint64) LinearMemory
|
|
}
|
|
|
|
// MemoryAllocatorFunc is a convenience for defining inlining a MemoryAllocator.
|
|
type MemoryAllocatorFunc func(cap, max uint64) LinearMemory
|
|
|
|
// Allocate implements MemoryAllocator.Allocate.
|
|
func (f MemoryAllocatorFunc) Allocate(cap, max uint64) LinearMemory {
|
|
return f(cap, max)
|
|
}
|
|
|
|
// LinearMemory is an expandable []byte that backs a Wasm linear memory.
|
|
type LinearMemory interface {
|
|
// Reallocates the linear memory to size bytes in length.
|
|
//
|
|
// Notes:
|
|
// - To back a shared memory, Reallocate can't change the address of the
|
|
// backing []byte (only its length/capacity may change).
|
|
// - Reallocate may return nil if fails to grow the LinearMemory. This
|
|
// condition may or may not be handled gracefully by the Wasm module.
|
|
Reallocate(size uint64) []byte
|
|
// Free the backing memory buffer.
|
|
Free()
|
|
}
|
|
|
|
// WithMemoryAllocator registers the given MemoryAllocator into the given
|
|
// context.Context.
|
|
func WithMemoryAllocator(ctx context.Context, allocator MemoryAllocator) context.Context {
|
|
if allocator != nil {
|
|
return context.WithValue(ctx, expctxkeys.MemoryAllocatorKey{}, allocator)
|
|
}
|
|
return ctx
|
|
}
|