SymbolRecordHelpers.cpp revision 360784 
1//===- SymbolRecordHelpers.cpp ----------------------------------*- C++ -*-===//
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
9#include "llvm/DebugInfo/CodeView/SymbolRecordHelpers.h"
10
11#include "llvm/ADT/SmallVector.h"
12#include "llvm/DebugInfo/CodeView/SymbolDeserializer.h"
13
14using namespace llvm;
15using namespace llvm::codeview;
16
17template <typename RecordT> static RecordT createRecord(const CVSymbol &sym) {
18  RecordT record(static_cast<SymbolRecordKind>(sym.kind()));
19  cantFail(SymbolDeserializer::deserializeAs<RecordT>(sym, record));
20  return record;
21}
22
23uint32_t llvm::codeview::getScopeEndOffset(const CVSymbol &Sym) {
24  assert(symbolOpensScope(Sym.kind()));
25  switch (Sym.kind()) {
26  case SymbolKind::S_GPROC32:
27  case SymbolKind::S_LPROC32:
28  case SymbolKind::S_GPROC32_ID:
29  case SymbolKind::S_LPROC32_ID:
30  case SymbolKind::S_LPROC32_DPC:
31  case SymbolKind::S_LPROC32_DPC_ID: {
32    ProcSym Proc = createRecord<ProcSym>(Sym);
33    return Proc.End;
34  }
35  case SymbolKind::S_BLOCK32: {
36    BlockSym Block = createRecord<BlockSym>(Sym);
37    return Block.End;
38  }
39  case SymbolKind::S_THUNK32: {
40    Thunk32Sym Thunk = createRecord<Thunk32Sym>(Sym);
41    return Thunk.End;
42  }
43  case SymbolKind::S_INLINESITE: {
44    InlineSiteSym Site = createRecord<InlineSiteSym>(Sym);
45    return Site.End;
46  }
47  default:
48    assert(false && "Unknown record type");
49    return 0;
50  }
51}
52
53uint32_t
54llvm::codeview::getScopeParentOffset(const llvm::codeview::CVSymbol &Sym) {
55  assert(symbolOpensScope(Sym.kind()));
56  switch (Sym.kind()) {
57  case SymbolKind::S_GPROC32:
58  case SymbolKind::S_LPROC32:
59  case SymbolKind::S_GPROC32_ID:
60  case SymbolKind::S_LPROC32_ID:
61  case SymbolKind::S_LPROC32_DPC:
62  case SymbolKind::S_LPROC32_DPC_ID: {
63    ProcSym Proc = createRecord<ProcSym>(Sym);
64    return Proc.Parent;
65  }
66  case SymbolKind::S_BLOCK32: {
67    BlockSym Block = createRecord<BlockSym>(Sym);
68    return Block.Parent;
69  }
70  case SymbolKind::S_THUNK32: {
71    Thunk32Sym Thunk = createRecord<Thunk32Sym>(Sym);
72    return Thunk.Parent;
73  }
74  case SymbolKind::S_INLINESITE: {
75    InlineSiteSym Site = createRecord<InlineSiteSym>(Sym);
76    return Site.Parent;
77  }
78  default:
79    assert(false && "Unknown record type");
80    return 0;
81  }
82}
83
84CVSymbolArray
85llvm::codeview::limitSymbolArrayToScope(const CVSymbolArray &Symbols,
86                                        uint32_t ScopeBegin) {
87  CVSymbol Opener = *Symbols.at(ScopeBegin);
88  assert(symbolOpensScope(Opener.kind()));
89  uint32_t EndOffset = getScopeEndOffset(Opener);
90  CVSymbol Closer = *Symbols.at(EndOffset);
91  EndOffset += Closer.RecordData.size();
92  return Symbols.substream(ScopeBegin, EndOffset);
93}
94