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Exposes api.Memory Grow (#535)

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This exports an API which allows host-defined functions access to
increase the memory size.

Fixes #483

Signed-off-by: Adrian Cole <adrian@tetrate.io>
This commit is contained in:
Crypt Keeper
2022-05-09 14:56:50 +08:00
committed by GitHub
parent 8f8c9ee205
commit 96bc7c8462
5 changed files with 50 additions and 23 deletions
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13
api/wasm.go
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@@ -221,14 +221,21 @@ type MutableGlobal interface {
// Note: This includes all value types available in WebAssembly 1.0 (20191205) and all are encoded little-endian.
// See https://www.w3.org/TR/2019/REC-wasm-core-1-20191205/#storage%E2%91%A0
type Memory interface {
// Size returns the size in bytes available. Ex. If the underlying memory has 1 page: 65536
//
// Note: this will not grow during a host function call, even if the underlying memory can. Ex. If the underlying
// memory has min 0 and max 2 pages, this returns zero.
//
// See https://www.w3.org/TR/2019/REC-wasm-core-1-20191205/#-hrefsyntax-instr-memorymathsfmemorysize%E2%91%A0
Size(context.Context) uint32
// Grow increases memory by the delta in pages (65536 bytes per page). The return val is the previous memory size in
// pages, or false if the delta was ignored as it exceeds max memory.
//
// Note: This is the same as the "memory.grow" instruction defined in the WebAssembly Core Specification, except
// returns false instead of -1 on failure
// See https://www.w3.org/TR/2019/REC-wasm-core-1-20191205/#grow-mem
// See MemorySizer
Grow(ctx context.Context, deltaPages uint32) (previousPages uint32, ok bool)
// IndexByte returns the index of the first instance of c in the underlying buffer at the offset or returns false if
// not found or out of range.
IndexByte(ctx context.Context, offset uint32, c byte) (uint32, bool)