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signature.go
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signature.go
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// Copyright (C) 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package jdbg
import "fmt"
// parseSignature returns the type for the signature string starting at offset.
// offset will be modified so that it is one byte beyond the end of the parsed
// string.
func (j *JDbg) parseSignature(sig string, offset *int) (Type, error) {
r := sig[*offset]
*offset++
switch r {
case 'V':
return j.cache.voidTy, nil
case 'Z':
return j.cache.boolTy, nil
case 'B':
return j.cache.byteTy, nil
case 'C':
return j.cache.charTy, nil
case 'S':
return j.cache.shortTy, nil
case 'I':
return j.cache.intTy, nil
case 'J':
return j.cache.longTy, nil
case 'F':
return j.cache.floatTy, nil
case 'D':
return j.cache.doubleTy, nil
case 'L':
// fully-qualified-class
start := *offset - 1 // include 'L'
for *offset < len(sig) {
r := sig[*offset]
*offset++
if r == ';' {
return j.classFromSig(sig[start:*offset])
}
}
return nil, fmt.Errorf("Fully qualified class missing terminating ';'")
case '[':
start := *offset - 1 // include '['
el, err := j.parseSignature(sig, offset)
if err != nil {
return nil, err
}
sig := sig[start:*offset]
if array, ok := j.cache.arrays[sig]; ok {
return array, nil
}
class, err := j.classFromSig(sig)
if err != nil {
return nil, err
}
array := &Array{class, el}
j.cache.arrays[sig] = array
return array, nil
default:
return nil, fmt.Errorf("Unknown signature type tag '%v'", r)
}
}