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Differential D39469 Diff 121058 llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp

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llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp

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#include <sstream> #include <sstream>
#include <string> #include <string>
#include <tuple> #include <tuple>
using namespace llvm; using namespace llvm;
#define DEBUG_TYPE "asan" #define DEBUG_TYPE "asan"
#if defined(OVERRIDE_SHADOW_SCALE)
static const uint64_t kDefaultShadowScale = OVERRIDE_SHADOW_SCALE;
#else
static const uint64_t kDefaultShadowScale = 3; static const uint64_t kDefaultShadowScale = 3;
#endif
static const uint64_t kDefaultShadowOffset32 = 1ULL << 29; static const uint64_t kDefaultShadowOffset32 = 1ULL << 29;
static const uint64_t kDefaultShadowOffset64 = 1ULL << 44; static const uint64_t kDefaultShadowOffset64 = 1ULL << 44;
static const uint64_t kDynamicShadowSentinel = static const uint64_t kDynamicShadowSentinel =
std::numeric_limits<uint64_t>::max(); std::numeric_limits<uint64_t>::max();
static const uint64_t kIOSShadowOffset32 = 1ULL << 30; static const uint64_t kIOSShadowOffset32 = 1ULL << 30;
static const uint64_t kIOSSimShadowOffset32 = 1ULL << 30; static const uint64_t kIOSSimShadowOffset32 = 1ULL << 30;
static const uint64_t kIOSSimShadowOffset64 = kDefaultShadowOffset64; static const uint64_t kIOSSimShadowOffset64 = kDefaultShadowOffset64;
static const uint64_t kSmallX86_64ShadowOffset = 0x7FFF8000; // < 2G. static const uint64_t kSmallX86_64ShadowOffset =
0x7FFFFFFF & ~((1 << (12 + kDefaultShadowScale)) - 1); // < 2G.
static const uint64_t kLinuxKasan_ShadowOffset64 = 0xdffffc0000000000; static const uint64_t kLinuxKasan_ShadowOffset64 = 0xdffffc0000000000;
static const uint64_t kPPC64_ShadowOffset64 = 1ULL << 41; static const uint64_t kPPC64_ShadowOffset64 = 1ULL << 41;
static const uint64_t kSystemZ_ShadowOffset64 = 1ULL << 52; static const uint64_t kSystemZ_ShadowOffset64 = 1ULL << 52;
static const uint64_t kMIPS32_ShadowOffset32 = 0x0aaa0000; static const uint64_t kMIPS32_ShadowOffset32 = 0x0aaa0000;
static const uint64_t kMIPS64_ShadowOffset64 = 1ULL << 37; static const uint64_t kMIPS64_ShadowOffset64 = 1ULL << 37;
static const uint64_t kAArch64_ShadowOffset64 = 1ULL << 36; static const uint64_t kAArch64_ShadowOffset64 = 1ULL << 36;
static const uint64_t kFreeBSD_ShadowOffset32 = 1ULL << 30; static const uint64_t kFreeBSD_ShadowOffset32 = 1ULL << 30;
static const uint64_t kFreeBSD_ShadowOffset64 = 1ULL << 46; static const uint64_t kFreeBSD_ShadowOffset64 = 1ULL << 46;
▲ Show 20 Lines • Show All 1,838 Lines • ▼ Show 20 Linesvoid AddressSanitizerModule::InstrumentGlobalsWithMetadataArray(
// On platforms that don't have a custom metadata section, we emit an array // On platforms that don't have a custom metadata section, we emit an array
// of global metadata structures. // of global metadata structures.
ArrayType *ArrayOfGlobalStructTy = ArrayType *ArrayOfGlobalStructTy =
ArrayType::get(MetadataInitializers[0]->getType(), N); ArrayType::get(MetadataInitializers[0]->getType(), N);
auto AllGlobals = new GlobalVariable( auto AllGlobals = new GlobalVariable(
M, ArrayOfGlobalStructTy, false, GlobalVariable::InternalLinkage, M, ArrayOfGlobalStructTy, false, GlobalVariable::InternalLinkage,
ConstantArray::get(ArrayOfGlobalStructTy, MetadataInitializers), ""); ConstantArray::get(ArrayOfGlobalStructTy, MetadataInitializers), "");
if (Mapping.Scale > 3)
AllGlobals->setAlignment(1ULL << Mapping.Scale);
IRB.CreateCall(AsanRegisterGlobals, IRB.CreateCall(AsanRegisterGlobals,
{IRB.CreatePointerCast(AllGlobals, IntptrTy), {IRB.CreatePointerCast(AllGlobals, IntptrTy),
ConstantInt::get(IntptrTy, N)}); ConstantInt::get(IntptrTy, N)});
// We also need to unregister globals at the end, e.g., when a shared library // We also need to unregister globals at the end, e.g., when a shared library
// gets closed. // gets closed.
IRBuilder<> IRB_Dtor = CreateAsanModuleDtor(M); IRBuilder<> IRB_Dtor = CreateAsanModuleDtor(M);
▲ Show 20 Lines • Show All 792 Lines • ▼ Show 20 Lines ASanStackVariableDescription D = {AI->getName().data(),
AI, AI,
0, 0,
0}; 0};
SVD.push_back(D); SVD.push_back(D);
} }
// Minimal header size (left redzone) is 4 pointers, // Minimal header size (left redzone) is 4 pointers,
// i.e. 32 bytes on 64-bit platforms and 16 bytes in 32-bit platforms. // i.e. 32 bytes on 64-bit platforms and 16 bytes in 32-bit platforms.
size_t MinHeaderSize = ASan.LongSize / 2; size_t Granularity = 1ULL << Mapping.Scale;
size_t MinHeaderSize = std::max((size_t)ASan.LongSize / 2, Granularity);
const ASanStackFrameLayout &L = const ASanStackFrameLayout &L =
ComputeASanStackFrameLayout(SVD, 1ULL << Mapping.Scale, MinHeaderSize); ComputeASanStackFrameLayout(SVD, Granularity, MinHeaderSize);
// Build AllocaToSVDMap for ASanStackVariableDescription lookup. // Build AllocaToSVDMap for ASanStackVariableDescription lookup.
DenseMap<const AllocaInst *, ASanStackVariableDescription *> AllocaToSVDMap; DenseMap<const AllocaInst *, ASanStackVariableDescription *> AllocaToSVDMap;
for (auto &Desc : SVD) for (auto &Desc : SVD)
AllocaToSVDMap[Desc.AI] = &Desc; AllocaToSVDMap[Desc.AI] = &Desc;
// Update SVD with information from lifetime intrinsics. // Update SVD with information from lifetime intrinsics.
for (const auto &APC : StaticAllocaPoisonCallVec) { for (const auto &APC : StaticAllocaPoisonCallVec) {
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