Add support for reading unaligned bytecode buffers
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5819 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Bytecode/Reader/Reader.cpp b/lib/Bytecode/Reader/Reader.cpp
index 60116af..3e495f4 100644
--- a/lib/Bytecode/Reader/Reader.cpp
+++ b/lib/Bytecode/Reader/Reader.cpp
@@ -639,8 +639,19 @@
Module *ParseBytecodeBuffer(const unsigned char *Buffer, unsigned Length,
std::string *ErrorStr) {
BytecodeParser Parser;
+ unsigned char *PtrToDelete = 0;
+ if ((intptr_t)Buffer & 3) { // If the buffer is not 4 byte aligned...
+ // Allocate a new buffer to hold the bytecode...
+ PtrToDelete = new unsigned char[Length+4];
+ unsigned Offset = 4-((intptr_t)PtrToDelete & 3); // Make sure it's aligned
+ memcpy(PtrToDelete+Offset, Buffer, Length); // Copy it over
+ Buffer = PtrToDelete+Offset;
+ }
+
Module *R = Parser.ParseBytecode(Buffer, Buffer+Length);
if (ErrorStr) *ErrorStr = Parser.getError();
+
+ delete [] PtrToDelete; // Delete alignment buffer if neccesary
return R;
}