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//===-- llvm/CodeGen/DIEHash.h - Dwarf Hashing Framework -------*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains support for DWARF4 hashing of DIEs.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/MD5.h"
namespace llvm {
class CompileUnit;
/// \brief An object containing the capability of hashing and adding hash
/// attributes onto a DIE.
class DIEHash {
// The entry for a particular attribute.
struct AttrEntry {
const DIEValue *Val;
const DIEAbbrevData *Desc;
};
// Collection of all attributes used in hashing a particular DIE.
struct DIEAttrs {
AttrEntry DW_AT_name;
};
public:
/// \brief Computes the ODR signature
uint64_t computeDIEODRSignature(DIE *Die);
/// \brief Computes the CU signature
uint64_t computeCUSignature(DIE *Die);
// Helper routines to process parts of a DIE.
private:
/// \brief Adds the parent context of \param Die to the hash.
void addParentContext(DIE *Die);
/// \brief Adds the attributes of \param Die to the hash.
void addAttributes(DIE *Die);
/// \brief Computes the full DWARF4 7.27 hash of the DIE.
void computeHash(DIE *Die);
// Routines that add DIEValues to the hash.
private:
/// \brief Encodes and adds \param Value to the hash as a ULEB128.
void addULEB128(uint64_t Value);
/// \brief Adds \param Str to the hash and includes a NULL byte.
void addString(StringRef Str);
/// \brief Collects the attributes of DIE \param Die into the \param Attrs
/// structure.
void collectAttributes(DIE *Die, DIEAttrs *Attrs);
/// \brief Hashes the attributes in \param Attrs in order.
void hashAttributes(DIEAttrs Attrs);
/// \brief Hashes an individual attribute.
void hashAttribute(AttrEntry Attr);
private:
MD5 Hash;
};
}
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