53 lines
1.3 KiB
Go
53 lines
1.3 KiB
Go
package binary
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import (
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"bytes"
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"fmt"
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"github.com/tetratelabs/wazero/api"
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"github.com/tetratelabs/wazero/internal/leb128"
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"github.com/tetratelabs/wazero/internal/wasm"
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)
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func decodeImport(
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r *bytes.Reader,
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idx uint32,
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memorySizer memorySizer,
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memoryLimitPages uint32,
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enabledFeatures api.CoreFeatures,
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ret *wasm.Import,
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) (err error) {
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if ret.Module, _, err = decodeUTF8(r, "import module"); err != nil {
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err = fmt.Errorf("import[%d] error decoding module: %w", idx, err)
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return
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}
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if ret.Name, _, err = decodeUTF8(r, "import name"); err != nil {
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err = fmt.Errorf("import[%d] error decoding name: %w", idx, err)
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return
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}
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b, err := r.ReadByte()
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if err != nil {
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err = fmt.Errorf("import[%d] error decoding type: %w", idx, err)
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return
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}
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ret.Type = b
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switch ret.Type {
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case wasm.ExternTypeFunc:
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ret.DescFunc, _, err = leb128.DecodeUint32(r)
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case wasm.ExternTypeTable:
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err = decodeTable(r, enabledFeatures, &ret.DescTable)
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case wasm.ExternTypeMemory:
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ret.DescMem, err = decodeMemory(r, enabledFeatures, memorySizer, memoryLimitPages)
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case wasm.ExternTypeGlobal:
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ret.DescGlobal, err = decodeGlobalType(r)
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default:
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err = fmt.Errorf("%w: invalid byte for importdesc: %#x", ErrInvalidByte, b)
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}
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if err != nil {
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err = fmt.Errorf("import[%d] %s[%s.%s]: %w", idx, wasm.ExternTypeName(ret.Type), ret.Module, ret.Name, err)
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}
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return
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}
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