Initial revision

llvm-svn: 2

1 files changed, 74 insertions, 0 deletions

diff --git a/llvm/lib/Bytecode/Writer/WriterInternals.h b/llvm/lib/Bytecode/Writer/WriterInternals.h
new file mode 100644
index 00000000000..be9ccf96672
--- /dev/null
+++ b/llvm/lib/Bytecode/Writer/WriterInternals.h
@@ -0,0 +1,74 @@
+//===-- WriterInternals.h - Data structures shared by the Writer -*- C++ -*--=//
+//
+// This header defines the interface used between components of the bytecode
+// writer.
+//
+// Note that the performance of this library is not terribly important, because
+// it shouldn't be used by JIT type applications... so it is not a huge focus
+// at least.  :)
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_BYTECODE_WRITER_WRITERINTERNALS_H
+#define LLVM_LIB_BYTECODE_WRITER_WRITERINTERNALS_H
+
+#include "llvm/Bytecode/Writer.h"
+#include "llvm/Bytecode/Format.h"
+#include "llvm/Bytecode/Primitives.h"
+#include "llvm/Analysis/SlotCalculator.h"
+#include "llvm/Tools/DataTypes.h"
+#include "llvm/Instruction.h"
+
+class BytecodeWriter : public ModuleAnalyzer {
+  vector<unsigned char> &Out;
+  SlotCalculator Table;
+public:
+  BytecodeWriter(vector<unsigned char> &o, const Module *M);
+
+protected:
+  virtual bool processConstPool(const ConstantPool &CP, bool isMethod);
+  virtual bool processMethod(const Method *M);
+  virtual bool processBasicBlock(const BasicBlock *BB);
+  virtual bool processInstruction(const Instruction *I);
+
+private :
+  inline void outputSignature() {
+    static const unsigned char *Sig =  (const unsigned char*)"llvm";
+    Out.insert(Out.end(), Sig, Sig+4); // output the bytecode signature...
+  }
+
+  void outputModuleInfoBlock(const Module *C);
+  void outputSymbolTable(const SymbolTable &ST);
+  bool outputConstant(const ConstPoolVal *CPV);
+  void outputType(const Type *T);
+};
+
+
+
+
+// BytecodeBlock - Little helper class that helps us do backpatching of bytecode
+// block sizes really easily.  It backpatches when it goes out of scope.
+//
+class BytecodeBlock {
+  unsigned Loc;
+  vector<unsigned char> &Out;
+
+  BytecodeBlock(const BytecodeBlock &);   // do not implement
+  void operator=(const BytecodeBlock &);  // do not implement
+public:
+  inline BytecodeBlock(unsigned ID, vector<unsigned char> &o) : Out(o) {
+    output(ID, Out);
+    output((unsigned)0, Out);         // Reserve the space for the block size...
+    Loc = Out.size();
+  }
+
+  inline ~BytecodeBlock() {           // Do backpatch when block goes out
+                                      // of scope...
+    //    cerr << "OldLoc = " << Loc << " NewLoc = " << NewLoc << " diff = " << (NewLoc-Loc) << endl;
+    output((unsigned)(Out.size()-Loc), Out, (int)Loc-4);
+    align32(Out);  // Blocks must ALWAYS be aligned
+  }
+};
+
+
+#endif