llvm/lib/DebugInfo/CodeView/SymbolRecordHelpers.cpp

   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/ArrayRef.h"
  12 #include "llvm/DebugInfo/CodeView/SymbolDeserializer.h"
  13
  14 using namespace llvm;
  15 using namespace llvm::codeview;
  16
  17 template <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
  23 uint32_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
  53 uint32_t
  54 llvm::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
  84 CVSymbolArray
  85 llvm::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 }