249167a898
This reintroduces `Type.h`, having earlier been renamed to `TypeBase.h`,
as a redirection to `TypeBase.h`, and redirects most users to include
the former instead.
This is a preparatory patch for being able to provide inline definitions
for `Type` methods which would otherwise cause a circular dependency
with `Decl{,CXX}.h`.
Doing these operations into their own NFC patch helps the git rename
detection logic work, preserving the history.
This patch makes clang just a little slower to build (~0.17%), just
because it makes more code indirectly include `DeclCXX.h`.
128 lines
4.9 KiB
C++
128 lines
4.9 KiB
C++
//===--- SanitizerMetadata.cpp - Ignored entities for sanitizers ----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Class which emits metadata consumed by sanitizer instrumentation passes.
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//
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//===----------------------------------------------------------------------===//
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#include "SanitizerMetadata.h"
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#include "CodeGenModule.h"
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#include "clang/AST/Attr.h"
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#include "clang/AST/Type.h"
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using namespace clang;
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using namespace CodeGen;
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SanitizerMetadata::SanitizerMetadata(CodeGenModule &CGM) : CGM(CGM) {}
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static bool isAsanHwasanMemTagOrTysan(const SanitizerSet &SS) {
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return SS.hasOneOf(SanitizerKind::Address | SanitizerKind::KernelAddress |
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SanitizerKind::HWAddress | SanitizerKind::MemTag |
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SanitizerKind::Type);
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}
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static SanitizerMask expandKernelSanitizerMasks(SanitizerMask Mask) {
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if (Mask & (SanitizerKind::Address | SanitizerKind::KernelAddress))
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Mask |= SanitizerKind::Address | SanitizerKind::KernelAddress;
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// Note: KHWASan doesn't support globals.
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return Mask;
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}
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void SanitizerMetadata::reportGlobal(llvm::GlobalVariable *GV,
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SourceLocation Loc, StringRef Name,
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QualType Ty,
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SanitizerMask NoSanitizeAttrMask,
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bool IsDynInit) {
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SanitizerSet FsanitizeArgument = CGM.getLangOpts().Sanitize;
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if (!isAsanHwasanMemTagOrTysan(FsanitizeArgument))
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return;
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FsanitizeArgument.Mask = expandKernelSanitizerMasks(FsanitizeArgument.Mask);
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NoSanitizeAttrMask = expandKernelSanitizerMasks(NoSanitizeAttrMask);
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SanitizerSet NoSanitizeAttrSet = {NoSanitizeAttrMask &
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FsanitizeArgument.Mask};
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llvm::GlobalVariable::SanitizerMetadata Meta;
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if (GV->hasSanitizerMetadata())
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Meta = GV->getSanitizerMetadata();
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Meta.NoAddress |= NoSanitizeAttrSet.hasOneOf(SanitizerKind::Address);
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Meta.NoAddress |= CGM.isInNoSanitizeList(
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FsanitizeArgument.Mask & SanitizerKind::Address, GV, Loc, Ty);
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Meta.NoHWAddress |= NoSanitizeAttrSet.hasOneOf(SanitizerKind::HWAddress);
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Meta.NoHWAddress |= CGM.isInNoSanitizeList(
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FsanitizeArgument.Mask & SanitizerKind::HWAddress, GV, Loc, Ty);
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Meta.Memtag |=
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static_cast<bool>(FsanitizeArgument.Mask & SanitizerKind::MemtagGlobals);
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Meta.Memtag &= !NoSanitizeAttrSet.hasOneOf(SanitizerKind::MemTag);
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Meta.Memtag &= !CGM.isInNoSanitizeList(
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FsanitizeArgument.Mask & SanitizerKind::MemTag, GV, Loc, Ty);
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Meta.IsDynInit = IsDynInit && !Meta.NoAddress &&
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FsanitizeArgument.has(SanitizerKind::Address) &&
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!CGM.isInNoSanitizeList(SanitizerKind::Address |
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SanitizerKind::KernelAddress,
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GV, Loc, Ty, "init");
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GV->setSanitizerMetadata(Meta);
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if (Ty.isNull() || !CGM.getLangOpts().Sanitize.has(SanitizerKind::Type) ||
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NoSanitizeAttrMask & SanitizerKind::Type)
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return;
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llvm::MDNode *TBAAInfo = CGM.getTBAATypeInfo(Ty);
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if (!TBAAInfo || TBAAInfo == CGM.getTBAATypeInfo(CGM.getContext().CharTy))
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return;
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llvm::Metadata *GlobalMetadata[] = {llvm::ConstantAsMetadata::get(GV),
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TBAAInfo};
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// Metadata for the global already registered.
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if (llvm::MDNode::getIfExists(CGM.getLLVMContext(), GlobalMetadata))
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return;
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llvm::MDNode *ThisGlobal =
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llvm::MDNode::get(CGM.getLLVMContext(), GlobalMetadata);
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llvm::NamedMDNode *TysanGlobals =
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CGM.getModule().getOrInsertNamedMetadata("llvm.tysan.globals");
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TysanGlobals->addOperand(ThisGlobal);
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}
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void SanitizerMetadata::reportGlobal(llvm::GlobalVariable *GV, const VarDecl &D,
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bool IsDynInit) {
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if (!isAsanHwasanMemTagOrTysan(CGM.getLangOpts().Sanitize))
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return;
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std::string QualName;
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llvm::raw_string_ostream OS(QualName);
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D.printQualifiedName(OS);
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auto getNoSanitizeMask = [](const VarDecl &D) {
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if (D.hasAttr<DisableSanitizerInstrumentationAttr>())
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return SanitizerKind::All;
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SanitizerMask NoSanitizeMask;
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for (auto *Attr : D.specific_attrs<NoSanitizeAttr>())
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NoSanitizeMask |= Attr->getMask();
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// External definitions and incomplete types get handled at the place they
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// are defined.
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if (D.hasExternalStorage() || D.getType()->isIncompleteType())
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NoSanitizeMask |= SanitizerKind::Type;
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return NoSanitizeMask;
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};
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reportGlobal(GV, D.getLocation(), QualName, D.getType(), getNoSanitizeMask(D),
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IsDynInit);
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}
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void SanitizerMetadata::disableSanitizerForGlobal(llvm::GlobalVariable *GV) {
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reportGlobal(GV, SourceLocation(), "", QualType(), SanitizerKind::All);
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}
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