cfb11f352a
This adds `RuntimeConfig.WithFeatureMutableGlobal(enabled bool)`, which allows disabling of mutable globals. When disabled, any attempt to add a mutable global, either explicitly or implicitly via decoding wasm will fail. To support this, there's a new `Features` bitflag that can allow up to 63 feature toggles without passing structs. While here, I fixed a significant performance problem in decoding binary: Before ``` BenchmarkCodecExample/binary.DecodeModule-16 184243 5623 ns/op 3848 B/op 184 allocs/op ``` Now ``` BenchmarkCodecExample/binary.DecodeModule-16 294084 3520 ns/op 2176 B/op 91 allocs/op ``` Signed-off-by: Adrian Cole <adrian@tetrate.io>
37 lines
1.0 KiB
Go
37 lines
1.0 KiB
Go
package binary
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import (
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"bytes"
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"fmt"
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wasm "github.com/tetratelabs/wazero/internal/wasm"
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)
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// decodeMemoryType returns the wasm.MemoryType decoded with the WebAssembly 1.0 (20191205) Binary Format.
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//
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// See https://www.w3.org/TR/2019/REC-wasm-core-1-20191205/#binary-memory
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func decodeMemoryType(r *bytes.Reader) (*wasm.MemoryType, error) {
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ret, err := decodeLimitsType(r)
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if err != nil {
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return nil, err
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}
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if ret.Min > wasm.MemoryMaxPages {
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return nil, fmt.Errorf("memory min must be at most 65536 pages (4GiB)")
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}
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if ret.Max != nil {
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if *ret.Max < ret.Min {
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return nil, fmt.Errorf("memory size minimum must not be greater than maximum")
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} else if *ret.Max > wasm.MemoryMaxPages {
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return nil, fmt.Errorf("memory max must be at most 65536 pages (4GiB)")
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}
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}
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return ret, nil
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}
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// encodeMemoryType returns the wasm.MemoryType encoded in WebAssembly 1.0 (20191205) Binary Format.
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//
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// See https://www.w3.org/TR/2019/REC-wasm-core-1-20191205/#binary-memory
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func encodeMemoryType(i *wasm.MemoryType) []byte {
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return encodeLimitsType(i)
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}
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