Implement constant pointers, and null specifically in the parser, bytecode writer, and

bytecode reader.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@668 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 17 insertions, 1 deletions

diff --git a/lib/Bytecode/Reader/ConstantReader.cpp b/lib/Bytecode/Reader/ConstantReader.cpp
index baa367d52b..ae206daa37 100644
--- a/lib/Bytecode/Reader/ConstantReader.cpp
+++ b/lib/Bytecode/Reader/ConstantReader.cpp
@@ -250,7 +250,7 @@ bool BytecodeParser::parseConstPoolValue(const uchar *&Buf,
   }
 
   case Type::StructTyID: {
-    const StructType *ST = (const StructType*)Ty;
+    const StructType *ST = Ty->castStructType();
     const StructType::ElementTypes &ET = ST->getElementTypes();
 
     vector<ConstPoolVal *> Elements;
@@ -267,6 +267,17 @@ bool BytecodeParser::parseConstPoolValue(const uchar *&Buf,
     break;
   }    
 
+  case Type::PointerTyID: {
+    const PointerType *PT = Ty->castPointerType();
+    unsigned SubClass;
+    if (read_vbr(Buf, EndBuf, SubClass)) return failure(true);
+    if (SubClass != 0) return failure(true);
+
+
+    V = ConstPoolPointer::getNullPointer(PT);
+    break;
+  }
+
   default:
     cerr << __FILE__ << ":" << __LINE__ 
 	 << ": Don't know how to deserialize constant value of type '"
diff --git a/lib/Bytecode/Writer/ConstantWriter.cpp b/lib/Bytecode/Writer/ConstantWriter.cpp
index 24ceaecf2e..dde47d52b1 100644
--- a/lib/Bytecode/Writer/ConstantWriter.cpp
+++ b/lib/Bytecode/Writer/ConstantWriter.cpp
@@ -141,6 +141,11 @@ bool BytecodeWriter::outputConstant(const ConstPoolVal *CPV) {
     break;
   }
 
+  case Type::PointerTyID: {
+    output_vbr((unsigned)0, Out);
+    break;
+  }
+
   case Type::FloatTyID: {   // Floating point types...
     float Tmp = (float)((const ConstPoolFP*)CPV)->getValue();
     output_data(&Tmp, &Tmp+1, Out);