LLVM  12.0.0git
GlobalTypeTableBuilder.cpp
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1 //===- GlobalTypeTableBuilder.cpp -----------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
10 #include "llvm/ADT/ArrayRef.h"
11 #include "llvm/ADT/DenseSet.h"
12 #include "llvm/ADT/STLExtras.h"
17 #include "llvm/Support/Allocator.h"
20 #include "llvm/Support/Endian.h"
21 #include "llvm/Support/Error.h"
22 #include <algorithm>
23 #include <cassert>
24 #include <cstdint>
25 #include <cstring>
26 
27 using namespace llvm;
28 using namespace llvm::codeview;
29 
31  return TypeIndex::fromArrayIndex(SeenRecords.size());
32 }
33 
35  : RecordStorage(Storage) {
36  SeenRecords.reserve(4096);
37 }
38 
40 
42  if (empty())
43  return None;
44 
46 }
47 
49  if (++Prev == nextTypeIndex())
50  return None;
51  return Prev;
52 }
53 
55  CVType Type(SeenRecords[Index.toArrayIndex()]);
56  return Type;
57 }
58 
60  llvm_unreachable("Method not implemented");
61 }
62 
64  if (Index.isSimple() || Index.isNoneType())
65  return false;
66 
67  return Index.toArrayIndex() < SeenRecords.size();
68 }
69 
70 uint32_t GlobalTypeTableBuilder::size() { return SeenRecords.size(); }
71 
72 uint32_t GlobalTypeTableBuilder::capacity() { return SeenRecords.size(); }
73 
75  return SeenRecords;
76 }
77 
79  return SeenHashes;
80 }
81 
83  HashedRecords.clear();
84  SeenRecords.clear();
85 }
86 
88  ArrayRef<uint8_t> Data) {
89  uint8_t *Stable = Alloc.Allocate<uint8_t>(Data.size());
90  memcpy(Stable, Data.data(), Data.size());
91  return makeArrayRef(Stable, Data.size());
92 }
93 
95  GloballyHashedType GHT =
96  GloballyHashedType::hashType(Record, SeenHashes, SeenHashes);
97  return insertRecordAs(GHT, Record.size(),
98  [Record](MutableArrayRef<uint8_t> Data) {
99  assert(Data.size() == Record.size());
100  ::memcpy(Data.data(), Record.data(), Record.size());
101  return Data;
102  });
103 }
104 
105 TypeIndex
107  TypeIndex TI;
108  auto Fragments = Builder.end(nextTypeIndex());
109  assert(!Fragments.empty());
110  for (auto C : Fragments)
111  TI = insertRecordBytes(C.RecordData);
112  return TI;
113 }
114 
116  bool Stabilize) {
117  assert(Index.toArrayIndex() < SeenRecords.size() &&
118  "This function cannot be used to insert records!");
119 
120  ArrayRef<uint8_t> Record = Data.data();
121  assert(Record.size() < UINT32_MAX && "Record too big");
122  assert(Record.size() % 4 == 0 &&
123  "The type record size is not a multiple of 4 bytes which will cause "
124  "misalignment in the output TPI stream!");
125 
126  GloballyHashedType Hash =
127  GloballyHashedType::hashType(Record, SeenHashes, SeenHashes);
128  auto Result = HashedRecords.try_emplace(Hash, Index.toArrayIndex());
129  if (!Result.second) {
130  Index = Result.first->second;
131  return false; // The record is already there, at a different location
132  }
133 
134  if (Stabilize)
135  Record = stabilize(RecordStorage, Record);
136 
137  SeenRecords[Index.toArrayIndex()] = Record;
138  SeenHashes[Index.toArrayIndex()] = Hash;
139  return true;
140 }
CVType getType(TypeIndex Index) override
Optional< TypeIndex > getFirst() override
This class represents lattice values for constants.
Definition: AllocatorList.h:23
bool replaceType(TypeIndex &Index, CVType Data, bool Stabilize) override
Optional< TypeIndex > getNext(TypeIndex Prev) override
GlobalTypeTableBuilder(BumpPtrAllocator &Storage)
This file defines the BumpPtrAllocator interface.
ArrayRef< T > makeArrayRef(const T &OneElt)
Construct an ArrayRef from a single element.
Definition: ArrayRef.h:458
bool isNoneType() const
Definition: TypeIndex.h:115
TypeIndex insertRecord(ContinuationRecordBuilder &Builder)
ArrayRef< GloballyHashedType > hashes() const
static const uint32_t FirstNonSimpleIndex
Definition: TypeIndex.h:97
ArrayRef - Represent a constant reference to an array (0 or more elements consecutively in memory)...
Definition: APInt.h:32
A 32-bit type reference.
Definition: TypeIndex.h:95
A globally hashed type represents a hash value that is sufficient to uniquely identify a record acros...
Definition: TypeHashing.h:77
uint32_t toArrayIndex() const
Definition: TypeIndex.h:117
ArrayRef< uint8_t > data() const
Definition: CVRecord.h:50
static TypeIndex fromArrayIndex(uint32_t Index)
Definition: TypeIndex.h:122
The instances of the Type class are immutable: once they are created, they are never changed...
Definition: Type.h:46
Allocate memory in an ever growing pool, as if by bump-pointer.
Definition: Allocator.h:67
size_t size() const
size - Get the array size.
Definition: ArrayRef.h:156
assume Assume Builder
ArrayRef< ArrayRef< uint8_t > > records() const
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
const T * data() const
Definition: ArrayRef.h:153
LLVM_ATTRIBUTE_RETURNS_NONNULL LLVM_ATTRIBUTE_RETURNS_NOALIAS void * Allocate(size_t Size, Align Alignment)
Allocate space at the specified alignment.
Definition: Allocator.h:144
static GloballyHashedType hashType(ArrayRef< uint8_t > RecordData, ArrayRef< GloballyHashedType > PreviousTypes, ArrayRef< GloballyHashedType > PreviousIds)
Given a sequence of bytes representing a record, compute a global hash for this record.
Definition: TypeHashing.cpp:33
std::vector< CVType > end(TypeIndex Index)
static ArrayRef< uint8_t > stabilize(BumpPtrAllocator &Alloc, ArrayRef< uint8_t > Data)
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
StringRef getTypeName(TypeIndex Index) override
TypeIndex insertRecordAs(GloballyHashedType Hash, size_t RecordSize, CreateFunc Create)
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:57
TypeIndex insertRecordBytes(ArrayRef< uint8_t > Data)