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package binary
import (
"bytes"
"fmt"
"github.com/tetratelabs/wazero/api"
"github.com/tetratelabs/wazero/internal/leb128"
"github.com/tetratelabs/wazero/internal/wasm"
)
func decodeFunctionType(enabledFeatures api.CoreFeatures, r *bytes.Reader, ret *wasm.FunctionType) (err error) {
b, err := r.ReadByte()
if err != nil {
return fmt.Errorf("read leading byte: %w", err)
}
if b != 0x60 {
return fmt.Errorf("%w: %#x != 0x60", ErrInvalidByte, b)
}
paramCount, _, err := leb128.DecodeUint32(r)
if err != nil {
return fmt.Errorf("could not read parameter count: %w", err)
}
paramTypes, err := decodeValueTypes(r, paramCount)
if err != nil {
return fmt.Errorf("could not read parameter types: %w", err)
}
resultCount, _, err := leb128.DecodeUint32(r)
if err != nil {
return fmt.Errorf("could not read result count: %w", err)
}
// Guard >1.0 feature multi-value
if resultCount > 1 {
if err = enabledFeatures.RequireEnabled(api.CoreFeatureMultiValue); err != nil {
return fmt.Errorf("multiple result types invalid as %v", err)
}
}
resultTypes, err := decodeValueTypes(r, resultCount)
if err != nil {
return fmt.Errorf("could not read result types: %w", err)
}
ret.Params = paramTypes
ret.Results = resultTypes
// cache the key for the function type
_ = ret.String()
return nil
}
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