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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.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DIEHASH_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_DIEHASH_H
#include "DIE.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/Support/MD5.h"
namespace llvm {
class AsmPrinter;
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;
AttrEntry DW_AT_type;
// Insert any additional ones here...
};
public:
DIEHash(AsmPrinter *A = nullptr) : AP(A) {}
/// \brief Computes the ODR signature.
uint64_t computeDIEODRSignature(const DIE &Die);
/// \brief Computes the CU signature.
uint64_t computeCUSignature(const DIE &Die);
/// \brief Computes the type signature.
uint64_t computeTypeSignature(const DIE &Die);
// Helper routines to process parts of a DIE.
private:
/// \brief Adds the parent context of \param Die to the hash.
void addParentContext(const DIE &Die);
/// \brief Adds the attributes of \param Die to the hash.
void addAttributes(const DIE &Die);
/// \brief Computes the full DWARF4 7.27 hash of the DIE.
void computeHash(const DIE &Die);
// Routines that add DIEValues to the hash.
public:
/// \brief Adds \param Value to the hash.
void update(uint8_t Value) { Hash.update(Value); }
/// \brief Encodes and adds \param Value to the hash as a ULEB128.
void addULEB128(uint64_t Value);
/// \brief Encodes and adds \param Value to the hash as a SLEB128.
void addSLEB128(int64_t Value);
private:
/// \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(const DIE &Die, DIEAttrs &Attrs);
/// \brief Hashes the attributes in \param Attrs in order.
void hashAttributes(const DIEAttrs &Attrs, dwarf::Tag Tag);
/// \brief Hashes the data in a block like DIEValue, e.g. DW_FORM_block or
/// DW_FORM_exprloc.
void hashBlockData(const SmallVectorImpl<DIEValue *> &Values);
/// \brief Hashes the contents pointed to in the .debug_loc section.
void hashLocList(const DIELocList &LocList);
/// \brief Hashes an individual attribute.
void hashAttribute(AttrEntry Attr, dwarf::Tag Tag);
/// \brief Hashes an attribute that refers to another DIE.
void hashDIEEntry(dwarf::Attribute Attribute, dwarf::Tag Tag,
const DIE &Entry);
/// \brief Hashes a reference to a named type in such a way that is
/// independent of whether that type is described by a declaration or a
/// definition.
void hashShallowTypeReference(dwarf::Attribute Attribute, const DIE &Entry,
StringRef Name);
/// \brief Hashes a reference to a previously referenced type DIE.
void hashRepeatedTypeReference(dwarf::Attribute Attribute,
unsigned DieNumber);
void hashNestedType(const DIE &Die, StringRef Name);
private:
MD5 Hash;
AsmPrinter *AP;
DenseMap<const DIE *, unsigned> Numbering;
};
}
#endif
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