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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;
AttrEntry DW_AT_accessibility;
AttrEntry DW_AT_address_class;
AttrEntry DW_AT_allocated;
AttrEntry DW_AT_artificial;
AttrEntry DW_AT_associated;
AttrEntry DW_AT_binary_scale;
AttrEntry DW_AT_bit_offset;
AttrEntry DW_AT_bit_size;
AttrEntry DW_AT_bit_stride;
AttrEntry DW_AT_byte_size;
AttrEntry DW_AT_byte_stride;
AttrEntry DW_AT_const_expr;
AttrEntry DW_AT_const_value;
AttrEntry DW_AT_containing_type;
AttrEntry DW_AT_count;
AttrEntry DW_AT_data_bit_offset;
AttrEntry DW_AT_data_location;
AttrEntry DW_AT_data_member_location;
AttrEntry DW_AT_decimal_scale;
AttrEntry DW_AT_decimal_sign;
AttrEntry DW_AT_default_value;
AttrEntry DW_AT_digit_count;
AttrEntry DW_AT_discr;
AttrEntry DW_AT_discr_list;
AttrEntry DW_AT_discr_value;
AttrEntry DW_AT_encoding;
AttrEntry DW_AT_enum_class;
AttrEntry DW_AT_endianity;
AttrEntry DW_AT_explicit;
AttrEntry DW_AT_is_optional;
AttrEntry DW_AT_location;
AttrEntry DW_AT_lower_bound;
AttrEntry DW_AT_mutable;
AttrEntry DW_AT_ordering;
AttrEntry DW_AT_picture_string;
AttrEntry DW_AT_prototyped;
AttrEntry DW_AT_small;
AttrEntry DW_AT_segment;
AttrEntry DW_AT_string_length;
AttrEntry DW_AT_threads_scaled;
AttrEntry DW_AT_upper_bound;
AttrEntry DW_AT_use_location;
AttrEntry DW_AT_use_UTF8;
AttrEntry DW_AT_variable_parameter;
AttrEntry DW_AT_virtuality;
AttrEntry DW_AT_visibility;
AttrEntry DW_AT_vtable_elem_location;
// Insert any additional ones here...
};
public:
/// \brief Computes the ODR signature.
uint64_t computeDIEODRSignature(DIE *Die);
/// \brief Computes the CU signature.
uint64_t computeCUSignature(DIE *Die);
/// \brief Computes the type signature.
uint64_t computeTypeSignature(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(const DIEAttrs &Attrs);
/// \brief Hashes an individual attribute.
void hashAttribute(AttrEntry Attr);
private:
MD5 Hash;
};
}
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