Added preliminary implementation of generic object serialization to bitcode.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43261 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Bitcode/Reader/Deserialize.cpp b/lib/Bitcode/Reader/Deserialize.cpp
new file mode 100644
index 0000000..ccd929a
--- /dev/null
+++ b/lib/Bitcode/Reader/Deserialize.cpp
@@ -0,0 +1,83 @@
+//==- Deserialize.cpp - Generic Object Serialization to Bitcode --*- C++ -*-==//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by Ted Kremenek and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the internal methods used for object serialization.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Bitcode/Serialization.h"
+
+using namespace llvm;
+
+Deserializer::Deserializer(BitstreamReader& stream)
+ : Stream(stream), RecIdx(0) {
+}
+
+Deserializer::~Deserializer() {
+ assert (RecIdx >= Record.size() &&
+ "Still scanning bitcode record when deserialization completed.");
+}
+
+void Deserializer::ReadRecord() {
+ // FIXME: Check if we haven't run off the edge of the stream.
+ // FIXME: Handle abbreviations.
+ unsigned Code = Stream.ReadCode();
+ // FIXME: Check for the correct code.
+ assert (Record.size() == 0);
+
+ Stream.ReadRecord(Code,Record);
+
+ assert (Record.size() > 0);
+}
+
+uint64_t Deserializer::ReadInt(unsigned Bits) {
+ // FIXME: Any error recovery/handling with incomplete or bad files?
+ if (!inRecord())
+ ReadRecord();
+
+ // FIXME: check for loss of precision in read (compare to Bits)
+ return Record[RecIdx++];
+}
+
+char* Deserializer::ReadCString(char* cstr, unsigned MaxLen, bool isNullTerm) {
+ if (cstr == NULL)
+ MaxLen = 0; // Zero this just in case someone does something funny.
+
+ unsigned len = ReadInt(32);
+
+ // FIXME: perform dynamic checking of lengths?
+ assert (MaxLen == 0 || (len + (isNullTerm ? 1 : 0)) <= MaxLen);
+
+ if (!cstr)
+ cstr = new char[len + (isNullTerm ? 1 : 0)];
+
+ assert (cstr != NULL);
+
+ for (unsigned i = 0; i < len; ++i)
+ cstr[i] = ReadInt(8);
+
+ if (isNullTerm)
+ cstr[len+1] = '\0';
+
+ return cstr;
+}
+
+void Deserializer::ReadCString(std::vector<char>& buff, bool isNullTerm) {
+ buff.clear();
+
+ unsigned len = ReadInt(32);
+
+ buff.reserve(len);
+
+ for (unsigned i = 0; i < len; ++i)
+ buff.push_back(ReadInt(8));
+
+ if (isNullTerm)
+ buff.push_back('\0');
+}