1 //===-- llvm/CodeGen/DIEHash.h - Dwarf Hashing Framework -------*- C++ -*--===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains support for DWARF4 hashing of DIEs.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/ADT/DenseMap.h"
15 #include "llvm/Support/MD5.h"
21 /// \brief An object containing the capability of hashing and adding hash
22 /// attributes onto a DIE.
24 // The entry for a particular attribute.
27 const DIEAbbrevData *Desc;
30 // Collection of all attributes used in hashing a particular DIE.
33 AttrEntry DW_AT_accessibility;
34 AttrEntry DW_AT_address_class;
35 AttrEntry DW_AT_allocated;
36 AttrEntry DW_AT_artificial;
37 AttrEntry DW_AT_associated;
38 AttrEntry DW_AT_binary_scale;
39 AttrEntry DW_AT_bit_offset;
40 AttrEntry DW_AT_bit_size;
41 AttrEntry DW_AT_bit_stride;
42 AttrEntry DW_AT_byte_size;
43 AttrEntry DW_AT_byte_stride;
44 AttrEntry DW_AT_const_expr;
45 AttrEntry DW_AT_const_value;
46 AttrEntry DW_AT_containing_type;
47 AttrEntry DW_AT_count;
48 AttrEntry DW_AT_data_bit_offset;
49 AttrEntry DW_AT_data_location;
50 AttrEntry DW_AT_data_member_location;
51 AttrEntry DW_AT_decimal_scale;
52 AttrEntry DW_AT_decimal_sign;
53 AttrEntry DW_AT_default_value;
54 AttrEntry DW_AT_digit_count;
55 AttrEntry DW_AT_discr;
56 AttrEntry DW_AT_discr_list;
57 AttrEntry DW_AT_discr_value;
58 AttrEntry DW_AT_encoding;
59 AttrEntry DW_AT_enum_class;
60 AttrEntry DW_AT_endianity;
61 AttrEntry DW_AT_explicit;
62 AttrEntry DW_AT_is_optional;
63 AttrEntry DW_AT_location;
64 AttrEntry DW_AT_lower_bound;
65 AttrEntry DW_AT_mutable;
66 AttrEntry DW_AT_ordering;
67 AttrEntry DW_AT_picture_string;
68 AttrEntry DW_AT_prototyped;
69 AttrEntry DW_AT_small;
70 AttrEntry DW_AT_segment;
71 AttrEntry DW_AT_string_length;
72 AttrEntry DW_AT_threads_scaled;
73 AttrEntry DW_AT_upper_bound;
74 AttrEntry DW_AT_use_location;
75 AttrEntry DW_AT_use_UTF8;
76 AttrEntry DW_AT_variable_parameter;
77 AttrEntry DW_AT_virtuality;
78 AttrEntry DW_AT_visibility;
79 AttrEntry DW_AT_vtable_elem_location;
82 // Insert any additional ones here...
86 /// \brief Computes the ODR signature.
87 uint64_t computeDIEODRSignature(DIE *Die);
89 /// \brief Computes the CU signature.
90 uint64_t computeCUSignature(DIE *Die);
92 /// \brief Computes the type signature.
93 uint64_t computeTypeSignature(DIE *Die);
95 // Helper routines to process parts of a DIE.
97 /// \brief Adds the parent context of \param Die to the hash.
98 void addParentContext(DIE *Die);
100 /// \brief Adds the attributes of \param Die to the hash.
101 void addAttributes(DIE *Die);
103 /// \brief Computes the full DWARF4 7.27 hash of the DIE.
104 void computeHash(DIE *Die);
106 // Routines that add DIEValues to the hash.
108 /// \brief Encodes and adds \param Value to the hash as a ULEB128.
109 void addULEB128(uint64_t Value);
111 /// \brief Encodes and adds \param Value to the hash as a SLEB128.
112 void addSLEB128(int64_t Value);
114 /// \brief Adds \param Str to the hash and includes a NULL byte.
115 void addString(StringRef Str);
117 /// \brief Collects the attributes of DIE \param Die into the \param Attrs
119 void collectAttributes(DIE *Die, DIEAttrs &Attrs);
121 /// \brief Hashes the attributes in \param Attrs in order.
122 void hashAttributes(const DIEAttrs &Attrs, dwarf::Tag Tag);
124 /// \brief Hashes an individual attribute.
125 void hashAttribute(AttrEntry Attr, dwarf::Tag Tag);
129 DenseMap<DIE*, unsigned> Numbering;