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interp: extra safety check in string emulation

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Ayke van Laethem
2019-01-11 20:19:54 +01:00
parent 3ebf464da2
commit c0ab91a263
1 changed files with 3 additions and 0 deletions
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interp/utils.go
+3
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@@ -63,6 +63,9 @@ func getZeroValue(typ llvm.Type) llvm.Value {
// getStringBytes loads the byte slice of a Go string represented as a // getStringBytes loads the byte slice of a Go string represented as a
// {ptr, len} pair. // {ptr, len} pair.
func getStringBytes(strPtr Value, strLen llvm.Value) []byte { func getStringBytes(strPtr Value, strLen llvm.Value) []byte {
if !strLen.IsConstant() {
panic("getStringBytes with a non-constant length")
}
buf := make([]byte, strLen.ZExtValue()) buf := make([]byte, strLen.ZExtValue())
for i := range buf { for i := range buf {
c := strPtr.GetElementPtr([]uint32{uint32(i)}).Load() c := strPtr.GetElementPtr([]uint32{uint32(i)}).Load()