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//===- NativeFunctionSymbol.cpp - info about function symbols----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/PDB/Native/NativeFunctionSymbol.h"
#include "llvm/DebugInfo/CodeView/CVRecord.h"
#include "llvm/DebugInfo/CodeView/CodeView.h"
#include "llvm/DebugInfo/CodeView/SymbolDeserializer.h"
#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
#include "llvm/DebugInfo/PDB/Native/ModuleDebugStream.h"
#include "llvm/DebugInfo/PDB/Native/NativeEnumSymbols.h"
#include "llvm/DebugInfo/PDB/Native/NativeSession.h"
#include "llvm/DebugInfo/PDB/Native/SymbolCache.h"
#include "llvm/DebugInfo/PDB/PDBExtras.h"
using namespace llvm;
using namespace llvm::codeview;
using namespace llvm::pdb;
NativeFunctionSymbol::NativeFunctionSymbol(NativeSession &Session,
SymIndexId Id,
const codeview::ProcSym &Sym,
uint32_t Offset)
: NativeRawSymbol(Session, PDB_SymType::Function, Id), Sym(Sym),
RecordOffset(Offset) {}
NativeFunctionSymbol::~NativeFunctionSymbol() = default;
void NativeFunctionSymbol::dump(raw_ostream &OS, int Indent,
PdbSymbolIdField ShowIdFields,
PdbSymbolIdField RecurseIdFields) const {
NativeRawSymbol::dump(OS, Indent, ShowIdFields, RecurseIdFields);
dumpSymbolField(OS, "name", getName(), Indent);
dumpSymbolField(OS, "length", getLength(), Indent);
dumpSymbolField(OS, "offset", getAddressOffset(), Indent);
dumpSymbolField(OS, "section", getAddressSection(), Indent);
}
uint32_t NativeFunctionSymbol::getAddressOffset() const {
return Sym.CodeOffset;
}
uint32_t NativeFunctionSymbol::getAddressSection() const { return Sym.Segment; }
std::string NativeFunctionSymbol::getName() const {
return std::string(Sym.Name);
}
uint64_t NativeFunctionSymbol::getLength() const { return Sym.CodeSize; }
uint32_t NativeFunctionSymbol::getRelativeVirtualAddress() const {
return Session.getRVAFromSectOffset(Sym.Segment, Sym.CodeOffset);
}
uint64_t NativeFunctionSymbol::getVirtualAddress() const {
return Session.getVAFromSectOffset(Sym.Segment, Sym.CodeOffset);
}
static bool inlineSiteContainsAddress(InlineSiteSym &IS,
uint32_t OffsetInFunc) {
// Returns true if inline site contains the offset.
bool Found = false;
uint32_t CodeOffset = 0;
for (auto &Annot : IS.annotations()) {
switch (Annot.OpCode) {
case BinaryAnnotationsOpCode::CodeOffset:
case BinaryAnnotationsOpCode::ChangeCodeOffset:
case BinaryAnnotationsOpCode::ChangeCodeOffsetAndLineOffset:
CodeOffset += Annot.U1;
if (OffsetInFunc >= CodeOffset)
Found = true;
break;
case BinaryAnnotationsOpCode::ChangeCodeLength:
CodeOffset += Annot.U1;
if (Found && OffsetInFunc < CodeOffset)
return true;
Found = false;
break;
case BinaryAnnotationsOpCode::ChangeCodeLengthAndCodeOffset:
CodeOffset += Annot.U2;
if (OffsetInFunc >= CodeOffset && OffsetInFunc < CodeOffset + Annot.U1)
return true;
Found = false;
break;
default:
break;
}
}
return false;
}
std::unique_ptr<IPDBEnumSymbols>
NativeFunctionSymbol::findInlineFramesByVA(uint64_t VA) const {
uint16_t Modi;
if (!Session.moduleIndexForVA(VA, Modi))
return nullptr;
Expected<ModuleDebugStreamRef> ModS = Session.getModuleDebugStream(Modi);
if (!ModS) {
consumeError(ModS.takeError());
return nullptr;
}
CVSymbolArray Syms = ModS->getSymbolArray();
// Search for inline sites. There should be one matching top level inline
// site. Then search in its nested inline sites.
std::vector<SymIndexId> Frames;
uint32_t CodeOffset = VA - getVirtualAddress();
auto Start = Syms.at(RecordOffset);
auto End = Syms.at(Sym.End);
while (Start != End) {
bool Found = false;
// Find matching inline site within Start and End.
for (; Start != End; ++Start) {
if (Start->kind() != S_INLINESITE)
continue;
InlineSiteSym IS =
cantFail(SymbolDeserializer::deserializeAs<InlineSiteSym>(*Start));
if (inlineSiteContainsAddress(IS, CodeOffset)) {
// Insert frames in reverse order.
SymIndexId Id = Session.getSymbolCache().getOrCreateInlineSymbol(
IS, getVirtualAddress(), Modi, Start.offset());
Frames.insert(Frames.begin(), Id);
// Update offsets to search within this inline site.
++Start;
End = Syms.at(IS.End);
Found = true;
break;
}
Start = Syms.at(IS.End);
if (Start == End)
break;
}
if (!Found)
break;
}
return std::make_unique<NativeEnumSymbols>(Session, std::move(Frames));
}
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