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 //===----------------------------------------------------------------------===//
15 #include "llvm/ADT/DenseMap.h"
16 #include "llvm/Support/MD5.h"
23 /// \brief An object containing the capability of hashing and adding hash
24 /// attributes onto a DIE.
26 // The entry for a particular attribute.
29 const DIEAbbrevData *Desc;
32 // Collection of all attributes used in hashing a particular DIE.
35 AttrEntry DW_AT_accessibility;
36 AttrEntry DW_AT_address_class;
37 AttrEntry DW_AT_allocated;
38 AttrEntry DW_AT_artificial;
39 AttrEntry DW_AT_associated;
40 AttrEntry DW_AT_binary_scale;
41 AttrEntry DW_AT_bit_offset;
42 AttrEntry DW_AT_bit_size;
43 AttrEntry DW_AT_bit_stride;
44 AttrEntry DW_AT_byte_size;
45 AttrEntry DW_AT_byte_stride;
46 AttrEntry DW_AT_const_expr;
47 AttrEntry DW_AT_const_value;
48 AttrEntry DW_AT_containing_type;
49 AttrEntry DW_AT_count;
50 AttrEntry DW_AT_data_bit_offset;
51 AttrEntry DW_AT_data_location;
52 AttrEntry DW_AT_data_member_location;
53 AttrEntry DW_AT_decimal_scale;
54 AttrEntry DW_AT_decimal_sign;
55 AttrEntry DW_AT_default_value;
56 AttrEntry DW_AT_digit_count;
57 AttrEntry DW_AT_discr;
58 AttrEntry DW_AT_discr_list;
59 AttrEntry DW_AT_discr_value;
60 AttrEntry DW_AT_encoding;
61 AttrEntry DW_AT_enum_class;
62 AttrEntry DW_AT_endianity;
63 AttrEntry DW_AT_explicit;
64 AttrEntry DW_AT_is_optional;
65 AttrEntry DW_AT_location;
66 AttrEntry DW_AT_lower_bound;
67 AttrEntry DW_AT_mutable;
68 AttrEntry DW_AT_ordering;
69 AttrEntry DW_AT_picture_string;
70 AttrEntry DW_AT_prototyped;
71 AttrEntry DW_AT_small;
72 AttrEntry DW_AT_segment;
73 AttrEntry DW_AT_string_length;
74 AttrEntry DW_AT_threads_scaled;
75 AttrEntry DW_AT_upper_bound;
76 AttrEntry DW_AT_use_location;
77 AttrEntry DW_AT_use_UTF8;
78 AttrEntry DW_AT_variable_parameter;
79 AttrEntry DW_AT_virtuality;
80 AttrEntry DW_AT_visibility;
81 AttrEntry DW_AT_vtable_elem_location;
84 // Insert any additional ones here...
88 DIEHash(AsmPrinter *A = NULL) : AP(A) {}
90 /// \brief Computes the ODR signature.
91 uint64_t computeDIEODRSignature(const DIE &Die);
93 /// \brief Computes the CU signature.
94 uint64_t computeCUSignature(const DIE &Die);
96 /// \brief Computes the type signature.
97 uint64_t computeTypeSignature(const DIE &Die);
99 // Helper routines to process parts of a DIE.
101 /// \brief Adds the parent context of \param Die to the hash.
102 void addParentContext(const DIE &Die);
104 /// \brief Adds the attributes of \param Die to the hash.
105 void addAttributes(const DIE &Die);
107 /// \brief Computes the full DWARF4 7.27 hash of the DIE.
108 void computeHash(const DIE &Die);
110 // Routines that add DIEValues to the hash.
112 /// \brief Encodes and adds \param Value to the hash as a ULEB128.
113 void addULEB128(uint64_t Value);
115 /// \brief Encodes and adds \param Value to the hash as a SLEB128.
116 void addSLEB128(int64_t Value);
118 /// \brief Adds \param Str to the hash and includes a NULL byte.
119 void addString(StringRef Str);
121 /// \brief Collects the attributes of DIE \param Die into the \param Attrs
123 void collectAttributes(const DIE &Die, DIEAttrs &Attrs);
125 /// \brief Hashes the attributes in \param Attrs in order.
126 void hashAttributes(const DIEAttrs &Attrs, dwarf::Tag Tag);
128 /// \brief Hashes the data in a block like DIEValue, e.g. DW_FORM_block or
130 void hashBlockData(const SmallVectorImpl<DIEValue *> &Values);
132 /// \brief Hashes an individual attribute.
133 void hashAttribute(AttrEntry Attr, dwarf::Tag Tag);
135 /// \brief Hashes an attribute that refers to another DIE.
136 void hashDIEEntry(dwarf::Attribute Attribute, dwarf::Tag Tag,
139 /// \brief Hashes a reference to a named type in such a way that is
140 /// independent of whether that type is described by a declaration or a
142 void hashShallowTypeReference(dwarf::Attribute Attribute, const DIE &Entry,
145 /// \brief Hashes a reference to a previously referenced type DIE.
146 void hashRepeatedTypeReference(dwarf::Attribute Attribute,
149 void hashNestedType(const DIE &Die, StringRef Name);
154 DenseMap<const DIE *, unsigned> Numbering;