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package binary
import (
"bytes"
"fmt"
"github.com/tetratelabs/wazero/api"
"github.com/tetratelabs/wazero/experimental"
"github.com/tetratelabs/wazero/internal/wasm"
)
// decodeMemory returns the api.Memory decoded with the WebAssembly 1.0 (20191205) Binary Format.
//
// See https://www.w3.org/TR/2019/REC-wasm-core-1-20191205/#binary-memory
func decodeMemory(
r *bytes.Reader,
enabledFeatures api.CoreFeatures,
memorySizer func(minPages uint32, maxPages *uint32) (min, capacity, max uint32),
memoryLimitPages uint32,
) (*wasm.Memory, error) {
min, maxP, shared, err := decodeLimitsType(r)
if err != nil {
return nil, err
}
if shared {
if !enabledFeatures.IsEnabled(experimental.CoreFeaturesThreads) {
return nil, fmt.Errorf("shared memory requested but threads feature not enabled")
}
// This restriction may be lifted in the future.
// https://webassembly.github.io/threads/core/binary/types.html#memory-types
if maxP == nil {
return nil, fmt.Errorf("shared memory requires a maximum size to be specified")
}
}
min, capacity, max := memorySizer(min, maxP)
mem := &wasm.Memory{Min: min, Cap: capacity, Max: max, IsMaxEncoded: maxP != nil, IsShared: shared}
return mem, mem.Validate(memoryLimitPages)
}
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