forked from OSchip/llvm-project
1054 lines
42 KiB
C++
1054 lines
42 KiB
C++
//===-- SanitizerCoverage.cpp - coverage instrumentation 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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// Coverage instrumentation done on LLVM IR level, works with Sanitizers.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Instrumentation/SanitizerCoverage.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Analysis/EHPersonalities.h"
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#include "llvm/Analysis/PostDominators.h"
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#include "llvm/IR/CFG.h"
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#include "llvm/IR/CallSite.h"
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#include "llvm/IR/Constant.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DebugInfo.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/InlineAsm.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/MDBuilder.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Type.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Transforms/Instrumentation.h"
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#include "llvm/Transforms/Utils/BasicBlockUtils.h"
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#include "llvm/Transforms/Utils/ModuleUtils.h"
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using namespace llvm;
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#define DEBUG_TYPE "sancov"
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static const char *const SanCovTracePCIndirName =
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"__sanitizer_cov_trace_pc_indir";
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static const char *const SanCovTracePCName = "__sanitizer_cov_trace_pc";
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static const char *const SanCovTraceCmp1 = "__sanitizer_cov_trace_cmp1";
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static const char *const SanCovTraceCmp2 = "__sanitizer_cov_trace_cmp2";
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static const char *const SanCovTraceCmp4 = "__sanitizer_cov_trace_cmp4";
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static const char *const SanCovTraceCmp8 = "__sanitizer_cov_trace_cmp8";
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static const char *const SanCovTraceConstCmp1 =
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"__sanitizer_cov_trace_const_cmp1";
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static const char *const SanCovTraceConstCmp2 =
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"__sanitizer_cov_trace_const_cmp2";
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static const char *const SanCovTraceConstCmp4 =
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"__sanitizer_cov_trace_const_cmp4";
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static const char *const SanCovTraceConstCmp8 =
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"__sanitizer_cov_trace_const_cmp8";
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static const char *const SanCovTraceDiv4 = "__sanitizer_cov_trace_div4";
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static const char *const SanCovTraceDiv8 = "__sanitizer_cov_trace_div8";
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static const char *const SanCovTraceGep = "__sanitizer_cov_trace_gep";
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static const char *const SanCovTraceSwitchName = "__sanitizer_cov_trace_switch";
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static const char *const SanCovModuleCtorTracePcGuardName =
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"sancov.module_ctor_trace_pc_guard";
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static const char *const SanCovModuleCtor8bitCountersName =
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"sancov.module_ctor_8bit_counters";
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static const uint64_t SanCtorAndDtorPriority = 2;
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static const char *const SanCovTracePCGuardName =
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"__sanitizer_cov_trace_pc_guard";
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static const char *const SanCovTracePCGuardInitName =
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"__sanitizer_cov_trace_pc_guard_init";
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static const char *const SanCov8bitCountersInitName =
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"__sanitizer_cov_8bit_counters_init";
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static const char *const SanCovPCsInitName = "__sanitizer_cov_pcs_init";
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static const char *const SanCovGuardsSectionName = "sancov_guards";
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static const char *const SanCovCountersSectionName = "sancov_cntrs";
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static const char *const SanCovPCsSectionName = "sancov_pcs";
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static const char *const SanCovLowestStackName = "__sancov_lowest_stack";
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static cl::opt<int> ClCoverageLevel(
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"sanitizer-coverage-level",
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cl::desc("Sanitizer Coverage. 0: none, 1: entry block, 2: all blocks, "
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"3: all blocks and critical edges"),
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cl::Hidden, cl::init(0));
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static cl::opt<bool> ClTracePC("sanitizer-coverage-trace-pc",
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cl::desc("Experimental pc tracing"), cl::Hidden,
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cl::init(false));
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static cl::opt<bool> ClTracePCGuard("sanitizer-coverage-trace-pc-guard",
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cl::desc("pc tracing with a guard"),
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cl::Hidden, cl::init(false));
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// If true, we create a global variable that contains PCs of all instrumented
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// BBs, put this global into a named section, and pass this section's bounds
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// to __sanitizer_cov_pcs_init.
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// This way the coverage instrumentation does not need to acquire the PCs
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// at run-time. Works with trace-pc-guard and inline-8bit-counters.
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static cl::opt<bool> ClCreatePCTable("sanitizer-coverage-pc-table",
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cl::desc("create a static PC table"),
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cl::Hidden, cl::init(false));
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static cl::opt<bool>
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ClInline8bitCounters("sanitizer-coverage-inline-8bit-counters",
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cl::desc("increments 8-bit counter for every edge"),
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cl::Hidden, cl::init(false));
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static cl::opt<bool>
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ClCMPTracing("sanitizer-coverage-trace-compares",
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cl::desc("Tracing of CMP and similar instructions"),
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cl::Hidden, cl::init(false));
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static cl::opt<bool> ClDIVTracing("sanitizer-coverage-trace-divs",
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cl::desc("Tracing of DIV instructions"),
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cl::Hidden, cl::init(false));
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static cl::opt<bool> ClGEPTracing("sanitizer-coverage-trace-geps",
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cl::desc("Tracing of GEP instructions"),
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cl::Hidden, cl::init(false));
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static cl::opt<bool>
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ClPruneBlocks("sanitizer-coverage-prune-blocks",
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cl::desc("Reduce the number of instrumented blocks"),
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cl::Hidden, cl::init(true));
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static cl::opt<bool> ClStackDepth("sanitizer-coverage-stack-depth",
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cl::desc("max stack depth tracing"),
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cl::Hidden, cl::init(false));
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namespace {
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SanitizerCoverageOptions getOptions(int LegacyCoverageLevel) {
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SanitizerCoverageOptions Res;
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switch (LegacyCoverageLevel) {
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case 0:
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Res.CoverageType = SanitizerCoverageOptions::SCK_None;
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break;
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case 1:
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Res.CoverageType = SanitizerCoverageOptions::SCK_Function;
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break;
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case 2:
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Res.CoverageType = SanitizerCoverageOptions::SCK_BB;
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break;
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case 3:
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Res.CoverageType = SanitizerCoverageOptions::SCK_Edge;
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break;
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case 4:
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Res.CoverageType = SanitizerCoverageOptions::SCK_Edge;
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Res.IndirectCalls = true;
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break;
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}
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return Res;
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}
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SanitizerCoverageOptions OverrideFromCL(SanitizerCoverageOptions Options) {
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// Sets CoverageType and IndirectCalls.
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SanitizerCoverageOptions CLOpts = getOptions(ClCoverageLevel);
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Options.CoverageType = std::max(Options.CoverageType, CLOpts.CoverageType);
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Options.IndirectCalls |= CLOpts.IndirectCalls;
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Options.TraceCmp |= ClCMPTracing;
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Options.TraceDiv |= ClDIVTracing;
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Options.TraceGep |= ClGEPTracing;
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Options.TracePC |= ClTracePC;
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Options.TracePCGuard |= ClTracePCGuard;
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Options.Inline8bitCounters |= ClInline8bitCounters;
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Options.PCTable |= ClCreatePCTable;
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Options.NoPrune |= !ClPruneBlocks;
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Options.StackDepth |= ClStackDepth;
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if (!Options.TracePCGuard && !Options.TracePC &&
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!Options.Inline8bitCounters && !Options.StackDepth)
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Options.TracePCGuard = true; // TracePCGuard is default.
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return Options;
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}
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bool canInstrumentWithSancov(const Function &F) {
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if (F.empty())
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return false;
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if (F.getName().find(".module_ctor") != std::string::npos)
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return false; // Should not instrument sanitizer init functions.
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if (F.getName().startswith("__sanitizer_"))
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return false; // Don't instrument __sanitizer_* callbacks.
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// Don't touch available_externally functions, their actual body is elewhere.
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if (F.getLinkage() == GlobalValue::AvailableExternallyLinkage)
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return false;
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// Don't instrument MSVC CRT configuration helpers. They may run before normal
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// initialization.
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if (F.getName() == "__local_stdio_printf_options" ||
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F.getName() == "__local_stdio_scanf_options")
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return false;
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if (isa<UnreachableInst>(F.getEntryBlock().getTerminator()))
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return false;
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// Don't instrument functions using SEH for now. Splitting basic blocks like
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// we do for coverage breaks WinEHPrepare.
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// FIXME: Remove this when SEH no longer uses landingpad pattern matching.
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if (F.hasPersonalityFn() &&
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isAsynchronousEHPersonality(classifyEHPersonality(F.getPersonalityFn())))
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return false;
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return true;
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}
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std::string getSectionStartImpl(const Triple &TargetTriple,
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const std::string &Section) {
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if (TargetTriple.isOSBinFormatMachO())
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return "\1section$start$__DATA$__" + Section;
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return "__start___" + Section;
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}
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std::string getSectionEndImpl(const Triple &TargetTriple,
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const std::string &Section) {
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if (TargetTriple.isOSBinFormatMachO())
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return "\1section$end$__DATA$__" + Section;
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return "__stop___" + Section;
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}
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/// This is a class for instrumenting the module to add calls to initializing
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/// the trace PC guards and 8bit counter globals. This should only be done
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/// though if there is at least one function that can be instrumented with
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/// Sancov.
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class ModuleSanitizerCoverage {
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public:
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ModuleSanitizerCoverage(const SanitizerCoverageOptions &Options)
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: Options(OverrideFromCL(Options)) {}
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bool instrumentModule(Module &M) {
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if (Options.CoverageType == SanitizerCoverageOptions::SCK_None)
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return false;
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Function *Ctor = nullptr;
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LLVMContext *C = &(M.getContext());
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const DataLayout *DL = &M.getDataLayout();
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TargetTriple = Triple(M.getTargetTriple());
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IntptrTy = Type::getIntNTy(*C, DL->getPointerSizeInBits());
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Type *IntptrPtrTy = PointerType::getUnqual(IntptrTy);
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IRBuilder<> IRB(*C);
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Type *Int32PtrTy = PointerType::getUnqual(IRB.getInt32Ty());
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Int8PtrTy = PointerType::getUnqual(IRB.getInt8Ty());
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Int8Ty = IRB.getInt8Ty();
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// Check that the __sancov_lowest_stack marker does not already exist.
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Constant *SanCovLowestStackConstant =
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M.getOrInsertGlobal(SanCovLowestStackName, IntptrTy);
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GlobalVariable *SanCovLowestStack =
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dyn_cast<GlobalVariable>(SanCovLowestStackConstant);
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if (!SanCovLowestStack) {
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C->emitError(StringRef("'") + SanCovLowestStackName +
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"' should not be declared by the user");
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return true;
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}
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// We want to emit guard init calls if the module contains a function that
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// we can instrument with SanitizerCoverage. We ignore any functions that
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// were inserted by SanitizerCoverage and get the result from the analysis
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// that checks for a valid function that the analysis may have run over.
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if (!llvm::any_of(
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M, [](const Function &F) { return canInstrumentWithSancov(F); }))
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return false;
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// Emit the init calls.
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if (Options.TracePCGuard)
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Ctor = CreateInitCallsForSections(M, SanCovModuleCtorTracePcGuardName,
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SanCovTracePCGuardInitName, Int32PtrTy,
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SanCovGuardsSectionName);
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if (Options.Inline8bitCounters)
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Ctor = CreateInitCallsForSections(M, SanCovModuleCtor8bitCountersName,
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SanCov8bitCountersInitName, Int8PtrTy,
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SanCovCountersSectionName);
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if (Ctor && Options.PCTable) {
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auto SecStartEnd =
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CreateSecStartEnd(M, SanCovPCsSectionName, IntptrPtrTy);
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FunctionCallee InitFunction = declareSanitizerInitFunction(
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M, SanCovPCsInitName, {IntptrPtrTy, IntptrPtrTy});
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IRBuilder<> IRBCtor(Ctor->getEntryBlock().getTerminator());
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IRBCtor.CreateCall(InitFunction, {SecStartEnd.first, SecStartEnd.second});
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}
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return Ctor;
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}
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private:
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Function *CreateInitCallsForSections(Module &M, const char *CtorName,
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const char *InitFunctionName, Type *Ty,
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const char *Section);
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std::pair<Value *, Value *> CreateSecStartEnd(Module &M, const char *Section,
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Type *Ty);
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std::string getSectionStart(const std::string &Section) const {
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return getSectionStartImpl(TargetTriple, Section);
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}
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std::string getSectionEnd(const std::string &Section) const {
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return getSectionEndImpl(TargetTriple, Section);
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}
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SanitizerCoverageOptions Options;
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Triple TargetTriple;
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Type *IntptrTy, *Int8PtrTy, *Int8Ty;
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};
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class ModuleSanitizerCoverageLegacyPass : public ModulePass {
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public:
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static char ID;
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ModuleSanitizerCoverageLegacyPass(
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SanitizerCoverageOptions Options = SanitizerCoverageOptions())
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: ModulePass(ID), Options(Options) {
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initializeModuleSanitizerCoverageLegacyPassPass(
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*PassRegistry::getPassRegistry());
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}
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bool runOnModule(Module &M) override {
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ModuleSanitizerCoverage ModuleSancov(Options);
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return ModuleSancov.instrumentModule(M);
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};
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StringRef getPassName() const override {
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return "ModuleSanitizerCoverageLegacyPass";
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}
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private:
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SanitizerCoverageOptions Options;
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};
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char ModuleSanitizerCoverageLegacyPass::ID = 0;
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class SanitizerCoverage {
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public:
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SanitizerCoverage(Function &F, const SanitizerCoverageOptions &Options)
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: CurModule(F.getParent()), Options(OverrideFromCL(Options)) {
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initializeModule(*F.getParent());
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}
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~SanitizerCoverage() { finalizeModule(*CurModule); }
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bool instrumentFunction(Function &F, const DominatorTree *DT,
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const PostDominatorTree *PDT);
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private:
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void initializeModule(Module &M);
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void finalizeModule(Module &M);
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void InjectCoverageForIndirectCalls(Function &F,
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ArrayRef<Instruction *> IndirCalls);
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void InjectTraceForCmp(Function &F, ArrayRef<Instruction *> CmpTraceTargets);
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void InjectTraceForDiv(Function &F,
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ArrayRef<BinaryOperator *> DivTraceTargets);
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void InjectTraceForGep(Function &F,
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ArrayRef<GetElementPtrInst *> GepTraceTargets);
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void InjectTraceForSwitch(Function &F,
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ArrayRef<Instruction *> SwitchTraceTargets);
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bool InjectCoverage(Function &F, ArrayRef<BasicBlock *> AllBlocks,
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bool IsLeafFunc = true);
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GlobalVariable *CreateFunctionLocalArrayInSection(size_t NumElements,
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Function &F, Type *Ty,
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const char *Section);
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GlobalVariable *CreatePCArray(Function &F, ArrayRef<BasicBlock *> AllBlocks);
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void CreateFunctionLocalArrays(Function &F, ArrayRef<BasicBlock *> AllBlocks);
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void InjectCoverageAtBlock(Function &F, BasicBlock &BB, size_t Idx,
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bool IsLeafFunc = true);
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void SetNoSanitizeMetadata(Instruction *I) {
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I->setMetadata(I->getModule()->getMDKindID("nosanitize"),
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MDNode::get(*C, None));
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}
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std::string getSectionName(const std::string &Section) const;
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std::string getSectionStart(const std::string &Section) const;
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std::string getSectionEnd(const std::string &Section) const;
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FunctionCallee SanCovTracePCIndir;
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FunctionCallee SanCovTracePC, SanCovTracePCGuard;
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FunctionCallee SanCovTraceCmpFunction[4];
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FunctionCallee SanCovTraceConstCmpFunction[4];
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FunctionCallee SanCovTraceDivFunction[2];
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FunctionCallee SanCovTraceGepFunction;
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FunctionCallee SanCovTraceSwitchFunction;
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GlobalVariable *SanCovLowestStack;
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InlineAsm *EmptyAsm;
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Type *IntptrTy, *IntptrPtrTy, *Int64Ty, *Int64PtrTy, *Int32Ty, *Int32PtrTy,
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*Int16Ty, *Int8Ty, *Int8PtrTy;
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Module *CurModule;
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std::string CurModuleUniqueId;
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Triple TargetTriple;
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LLVMContext *C;
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const DataLayout *DL;
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GlobalVariable *FunctionGuardArray; // for trace-pc-guard.
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GlobalVariable *Function8bitCounterArray; // for inline-8bit-counters.
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GlobalVariable *FunctionPCsArray; // for pc-table.
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SmallVector<GlobalValue *, 20> GlobalsToAppendToUsed;
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SmallVector<GlobalValue *, 20> GlobalsToAppendToCompilerUsed;
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SanitizerCoverageOptions Options;
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};
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class SanitizerCoverageLegacyPass : public FunctionPass {
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public:
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static char ID; // Pass identification, replacement for typeid
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SanitizerCoverageLegacyPass(
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SanitizerCoverageOptions Options = SanitizerCoverageOptions())
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: FunctionPass(ID), Options(Options) {
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initializeSanitizerCoverageLegacyPassPass(*PassRegistry::getPassRegistry());
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}
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bool runOnFunction(Function &F) override {
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const DominatorTree *DT =
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&getAnalysis<DominatorTreeWrapperPass>().getDomTree();
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const PostDominatorTree *PDT =
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&getAnalysis<PostDominatorTreeWrapperPass>().getPostDomTree();
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SanitizerCoverage Sancov(F, Options);
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return Sancov.instrumentFunction(F, DT, PDT);
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}
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StringRef getPassName() const override {
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return "SanitizerCoverageLegacyPass";
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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// Make the module sancov pass required by this pass so that it runs when
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// -sancov is passed.
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AU.addRequired<ModuleSanitizerCoverageLegacyPass>();
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AU.addRequired<DominatorTreeWrapperPass>();
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AU.addRequired<PostDominatorTreeWrapperPass>();
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}
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private:
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SanitizerCoverageOptions Options;
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};
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} // namespace
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PreservedAnalyses SanitizerCoveragePass::run(Function &F,
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FunctionAnalysisManager &AM) {
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const DominatorTree *DT = &AM.getResult<DominatorTreeAnalysis>(F);
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const PostDominatorTree *PDT = &AM.getResult<PostDominatorTreeAnalysis>(F);
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SanitizerCoverage Sancov(F, Options);
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if (Sancov.instrumentFunction(F, DT, PDT))
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return PreservedAnalyses::none();
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return PreservedAnalyses::all();
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}
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PreservedAnalyses ModuleSanitizerCoveragePass::run(Module &M,
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ModuleAnalysisManager &AM) {
|
|
ModuleSanitizerCoverage ModuleSancov(Options);
|
|
if (ModuleSancov.instrumentModule(M))
|
|
return PreservedAnalyses::none();
|
|
return PreservedAnalyses::all();
|
|
}
|
|
|
|
std::pair<Value *, Value *>
|
|
ModuleSanitizerCoverage::CreateSecStartEnd(Module &M, const char *Section,
|
|
Type *Ty) {
|
|
GlobalVariable *SecStart =
|
|
new GlobalVariable(M, Ty, false, GlobalVariable::ExternalLinkage, nullptr,
|
|
getSectionStart(Section));
|
|
SecStart->setVisibility(GlobalValue::HiddenVisibility);
|
|
GlobalVariable *SecEnd =
|
|
new GlobalVariable(M, Ty, false, GlobalVariable::ExternalLinkage,
|
|
nullptr, getSectionEnd(Section));
|
|
SecEnd->setVisibility(GlobalValue::HiddenVisibility);
|
|
|
|
IRBuilder<> IRB(M.getContext());
|
|
Value *SecEndPtr = IRB.CreatePointerCast(SecEnd, Ty);
|
|
if (!TargetTriple.isOSBinFormatCOFF())
|
|
return std::make_pair(IRB.CreatePointerCast(SecStart, Ty), SecEndPtr);
|
|
|
|
// Account for the fact that on windows-msvc __start_* symbols actually
|
|
// point to a uint64_t before the start of the array.
|
|
auto SecStartI8Ptr = IRB.CreatePointerCast(SecStart, Int8PtrTy);
|
|
auto GEP = IRB.CreateGEP(Int8Ty, SecStartI8Ptr,
|
|
ConstantInt::get(IntptrTy, sizeof(uint64_t)));
|
|
return std::make_pair(IRB.CreatePointerCast(GEP, Ty), SecEndPtr);
|
|
}
|
|
|
|
Function *ModuleSanitizerCoverage::CreateInitCallsForSections(
|
|
Module &M, const char *CtorName, const char *InitFunctionName, Type *Ty,
|
|
const char *Section) {
|
|
auto SecStartEnd = CreateSecStartEnd(M, Section, Ty);
|
|
auto SecStart = SecStartEnd.first;
|
|
auto SecEnd = SecStartEnd.second;
|
|
Function *CtorFunc;
|
|
std::tie(CtorFunc, std::ignore) = createSanitizerCtorAndInitFunctions(
|
|
M, CtorName, InitFunctionName, {Ty, Ty}, {SecStart, SecEnd});
|
|
assert(CtorFunc->getName() == CtorName);
|
|
|
|
if (TargetTriple.supportsCOMDAT()) {
|
|
// Use comdat to dedup CtorFunc.
|
|
CtorFunc->setComdat(M.getOrInsertComdat(CtorName));
|
|
appendToGlobalCtors(M, CtorFunc, SanCtorAndDtorPriority, CtorFunc);
|
|
} else {
|
|
appendToGlobalCtors(M, CtorFunc, SanCtorAndDtorPriority);
|
|
}
|
|
|
|
if (TargetTriple.isOSBinFormatCOFF()) {
|
|
// In COFF files, if the contructors are set as COMDAT (they are because
|
|
// COFF supports COMDAT) and the linker flag /OPT:REF (strip unreferenced
|
|
// functions and data) is used, the constructors get stripped. To prevent
|
|
// this, give the constructors weak ODR linkage and ensure the linker knows
|
|
// to include the sancov constructor. This way the linker can deduplicate
|
|
// the constructors but always leave one copy.
|
|
CtorFunc->setLinkage(GlobalValue::WeakODRLinkage);
|
|
appendToUsed(M, CtorFunc);
|
|
}
|
|
return CtorFunc;
|
|
}
|
|
|
|
void SanitizerCoverage::initializeModule(Module &M) {
|
|
if (Options.CoverageType == SanitizerCoverageOptions::SCK_None)
|
|
return;
|
|
C = &(M.getContext());
|
|
DL = &M.getDataLayout();
|
|
CurModuleUniqueId = getUniqueModuleId(CurModule);
|
|
TargetTriple = Triple(M.getTargetTriple());
|
|
FunctionGuardArray = nullptr;
|
|
Function8bitCounterArray = nullptr;
|
|
FunctionPCsArray = nullptr;
|
|
IntptrTy = Type::getIntNTy(*C, DL->getPointerSizeInBits());
|
|
IntptrPtrTy = PointerType::getUnqual(IntptrTy);
|
|
Type *VoidTy = Type::getVoidTy(*C);
|
|
IRBuilder<> IRB(*C);
|
|
Int64PtrTy = PointerType::getUnqual(IRB.getInt64Ty());
|
|
Int32PtrTy = PointerType::getUnqual(IRB.getInt32Ty());
|
|
Int8PtrTy = PointerType::getUnqual(IRB.getInt8Ty());
|
|
Int64Ty = IRB.getInt64Ty();
|
|
Int32Ty = IRB.getInt32Ty();
|
|
Int16Ty = IRB.getInt16Ty();
|
|
Int8Ty = IRB.getInt8Ty();
|
|
|
|
SanCovTracePCIndir =
|
|
M.getOrInsertFunction(SanCovTracePCIndirName, VoidTy, IntptrTy);
|
|
// Make sure smaller parameters are zero-extended to i64 as required by the
|
|
// x86_64 ABI.
|
|
AttributeList SanCovTraceCmpZeroExtAL;
|
|
if (TargetTriple.getArch() == Triple::x86_64) {
|
|
SanCovTraceCmpZeroExtAL =
|
|
SanCovTraceCmpZeroExtAL.addParamAttribute(*C, 0, Attribute::ZExt);
|
|
SanCovTraceCmpZeroExtAL =
|
|
SanCovTraceCmpZeroExtAL.addParamAttribute(*C, 1, Attribute::ZExt);
|
|
}
|
|
|
|
SanCovTraceCmpFunction[0] =
|
|
M.getOrInsertFunction(SanCovTraceCmp1, SanCovTraceCmpZeroExtAL, VoidTy,
|
|
IRB.getInt8Ty(), IRB.getInt8Ty());
|
|
SanCovTraceCmpFunction[1] =
|
|
M.getOrInsertFunction(SanCovTraceCmp2, SanCovTraceCmpZeroExtAL, VoidTy,
|
|
IRB.getInt16Ty(), IRB.getInt16Ty());
|
|
SanCovTraceCmpFunction[2] =
|
|
M.getOrInsertFunction(SanCovTraceCmp4, SanCovTraceCmpZeroExtAL, VoidTy,
|
|
IRB.getInt32Ty(), IRB.getInt32Ty());
|
|
SanCovTraceCmpFunction[3] =
|
|
M.getOrInsertFunction(SanCovTraceCmp8, VoidTy, Int64Ty, Int64Ty);
|
|
|
|
SanCovTraceConstCmpFunction[0] = M.getOrInsertFunction(
|
|
SanCovTraceConstCmp1, SanCovTraceCmpZeroExtAL, VoidTy, Int8Ty, Int8Ty);
|
|
SanCovTraceConstCmpFunction[1] = M.getOrInsertFunction(
|
|
SanCovTraceConstCmp2, SanCovTraceCmpZeroExtAL, VoidTy, Int16Ty, Int16Ty);
|
|
SanCovTraceConstCmpFunction[2] = M.getOrInsertFunction(
|
|
SanCovTraceConstCmp4, SanCovTraceCmpZeroExtAL, VoidTy, Int32Ty, Int32Ty);
|
|
SanCovTraceConstCmpFunction[3] =
|
|
M.getOrInsertFunction(SanCovTraceConstCmp8, VoidTy, Int64Ty, Int64Ty);
|
|
|
|
{
|
|
AttributeList AL;
|
|
if (TargetTriple.getArch() == Triple::x86_64)
|
|
AL = AL.addParamAttribute(*C, 0, Attribute::ZExt);
|
|
SanCovTraceDivFunction[0] =
|
|
M.getOrInsertFunction(SanCovTraceDiv4, AL, VoidTy, IRB.getInt32Ty());
|
|
}
|
|
SanCovTraceDivFunction[1] =
|
|
M.getOrInsertFunction(SanCovTraceDiv8, VoidTy, Int64Ty);
|
|
SanCovTraceGepFunction =
|
|
M.getOrInsertFunction(SanCovTraceGep, VoidTy, IntptrTy);
|
|
SanCovTraceSwitchFunction =
|
|
M.getOrInsertFunction(SanCovTraceSwitchName, VoidTy, Int64Ty, Int64PtrTy);
|
|
|
|
Constant *SanCovLowestStackConstant =
|
|
M.getOrInsertGlobal(SanCovLowestStackName, IntptrTy);
|
|
SanCovLowestStack = dyn_cast<GlobalVariable>(SanCovLowestStackConstant);
|
|
SanCovLowestStack->setThreadLocalMode(
|
|
GlobalValue::ThreadLocalMode::InitialExecTLSModel);
|
|
if (Options.StackDepth && !SanCovLowestStack->isDeclaration())
|
|
SanCovLowestStack->setInitializer(Constant::getAllOnesValue(IntptrTy));
|
|
|
|
// We insert an empty inline asm after cov callbacks to avoid callback merge.
|
|
EmptyAsm = InlineAsm::get(FunctionType::get(IRB.getVoidTy(), false),
|
|
StringRef(""), StringRef(""),
|
|
/*hasSideEffects=*/true);
|
|
|
|
SanCovTracePC = M.getOrInsertFunction(SanCovTracePCName, VoidTy);
|
|
SanCovTracePCGuard =
|
|
M.getOrInsertFunction(SanCovTracePCGuardName, VoidTy, Int32PtrTy);
|
|
}
|
|
|
|
void SanitizerCoverage::finalizeModule(Module &M) {
|
|
// We don't reference these arrays directly in any of our runtime functions,
|
|
// so we need to prevent them from being dead stripped.
|
|
if (TargetTriple.isOSBinFormatMachO())
|
|
appendToUsed(M, GlobalsToAppendToUsed);
|
|
appendToCompilerUsed(M, GlobalsToAppendToCompilerUsed);
|
|
}
|
|
|
|
// True if block has successors and it dominates all of them.
|
|
static bool isFullDominator(const BasicBlock *BB, const DominatorTree *DT) {
|
|
if (succ_begin(BB) == succ_end(BB))
|
|
return false;
|
|
|
|
for (const BasicBlock *SUCC : make_range(succ_begin(BB), succ_end(BB))) {
|
|
if (!DT->dominates(BB, SUCC))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// True if block has predecessors and it postdominates all of them.
|
|
static bool isFullPostDominator(const BasicBlock *BB,
|
|
const PostDominatorTree *PDT) {
|
|
if (pred_begin(BB) == pred_end(BB))
|
|
return false;
|
|
|
|
for (const BasicBlock *PRED : make_range(pred_begin(BB), pred_end(BB))) {
|
|
if (!PDT->dominates(BB, PRED))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool shouldInstrumentBlock(const Function &F, const BasicBlock *BB,
|
|
const DominatorTree *DT,
|
|
const PostDominatorTree *PDT,
|
|
const SanitizerCoverageOptions &Options) {
|
|
// Don't insert coverage for blocks containing nothing but unreachable: we
|
|
// will never call __sanitizer_cov() for them, so counting them in
|
|
// NumberOfInstrumentedBlocks() might complicate calculation of code coverage
|
|
// percentage. Also, unreachable instructions frequently have no debug
|
|
// locations.
|
|
if (isa<UnreachableInst>(BB->getFirstNonPHIOrDbgOrLifetime()))
|
|
return false;
|
|
|
|
// Don't insert coverage into blocks without a valid insertion point
|
|
// (catchswitch blocks).
|
|
if (BB->getFirstInsertionPt() == BB->end())
|
|
return false;
|
|
|
|
if (Options.NoPrune || &F.getEntryBlock() == BB)
|
|
return true;
|
|
|
|
if (Options.CoverageType == SanitizerCoverageOptions::SCK_Function &&
|
|
&F.getEntryBlock() != BB)
|
|
return false;
|
|
|
|
// Do not instrument full dominators, or full post-dominators with multiple
|
|
// predecessors.
|
|
return !isFullDominator(BB, DT)
|
|
&& !(isFullPostDominator(BB, PDT) && !BB->getSinglePredecessor());
|
|
}
|
|
|
|
|
|
// Returns true iff From->To is a backedge.
|
|
// A twist here is that we treat From->To as a backedge if
|
|
// * To dominates From or
|
|
// * To->UniqueSuccessor dominates From
|
|
static bool IsBackEdge(BasicBlock *From, BasicBlock *To,
|
|
const DominatorTree *DT) {
|
|
if (DT->dominates(To, From))
|
|
return true;
|
|
if (auto Next = To->getUniqueSuccessor())
|
|
if (DT->dominates(Next, From))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
// Prunes uninteresting Cmp instrumentation:
|
|
// * CMP instructions that feed into loop backedge branch.
|
|
//
|
|
// Note that Cmp pruning is controlled by the same flag as the
|
|
// BB pruning.
|
|
static bool IsInterestingCmp(ICmpInst *CMP, const DominatorTree *DT,
|
|
const SanitizerCoverageOptions &Options) {
|
|
if (!Options.NoPrune)
|
|
if (CMP->hasOneUse())
|
|
if (auto BR = dyn_cast<BranchInst>(CMP->user_back()))
|
|
for (BasicBlock *B : BR->successors())
|
|
if (IsBackEdge(BR->getParent(), B, DT))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
bool SanitizerCoverage::instrumentFunction(Function &F, const DominatorTree *DT,
|
|
const PostDominatorTree *PDT) {
|
|
if (Options.CoverageType == SanitizerCoverageOptions::SCK_None)
|
|
return false;
|
|
if (!canInstrumentWithSancov(F))
|
|
return false;
|
|
if (Options.CoverageType >= SanitizerCoverageOptions::SCK_Edge)
|
|
SplitAllCriticalEdges(F, CriticalEdgeSplittingOptions().setIgnoreUnreachableDests());
|
|
SmallVector<Instruction *, 8> IndirCalls;
|
|
SmallVector<BasicBlock *, 16> BlocksToInstrument;
|
|
SmallVector<Instruction *, 8> CmpTraceTargets;
|
|
SmallVector<Instruction *, 8> SwitchTraceTargets;
|
|
SmallVector<BinaryOperator *, 8> DivTraceTargets;
|
|
SmallVector<GetElementPtrInst *, 8> GepTraceTargets;
|
|
|
|
bool IsLeafFunc = true;
|
|
|
|
for (auto &BB : F) {
|
|
if (shouldInstrumentBlock(F, &BB, DT, PDT, Options))
|
|
BlocksToInstrument.push_back(&BB);
|
|
for (auto &Inst : BB) {
|
|
if (Options.IndirectCalls) {
|
|
CallSite CS(&Inst);
|
|
if (CS && !CS.getCalledFunction())
|
|
IndirCalls.push_back(&Inst);
|
|
}
|
|
if (Options.TraceCmp) {
|
|
if (ICmpInst *CMP = dyn_cast<ICmpInst>(&Inst))
|
|
if (IsInterestingCmp(CMP, DT, Options))
|
|
CmpTraceTargets.push_back(&Inst);
|
|
if (isa<SwitchInst>(&Inst))
|
|
SwitchTraceTargets.push_back(&Inst);
|
|
}
|
|
if (Options.TraceDiv)
|
|
if (BinaryOperator *BO = dyn_cast<BinaryOperator>(&Inst))
|
|
if (BO->getOpcode() == Instruction::SDiv ||
|
|
BO->getOpcode() == Instruction::UDiv)
|
|
DivTraceTargets.push_back(BO);
|
|
if (Options.TraceGep)
|
|
if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(&Inst))
|
|
GepTraceTargets.push_back(GEP);
|
|
if (Options.StackDepth)
|
|
if (isa<InvokeInst>(Inst) ||
|
|
(isa<CallInst>(Inst) && !isa<IntrinsicInst>(Inst)))
|
|
IsLeafFunc = false;
|
|
}
|
|
}
|
|
|
|
InjectCoverage(F, BlocksToInstrument, IsLeafFunc);
|
|
InjectCoverageForIndirectCalls(F, IndirCalls);
|
|
InjectTraceForCmp(F, CmpTraceTargets);
|
|
InjectTraceForSwitch(F, SwitchTraceTargets);
|
|
InjectTraceForDiv(F, DivTraceTargets);
|
|
InjectTraceForGep(F, GepTraceTargets);
|
|
return true;
|
|
}
|
|
|
|
GlobalVariable *SanitizerCoverage::CreateFunctionLocalArrayInSection(
|
|
size_t NumElements, Function &F, Type *Ty, const char *Section) {
|
|
ArrayType *ArrayTy = ArrayType::get(Ty, NumElements);
|
|
auto Array = new GlobalVariable(
|
|
*CurModule, ArrayTy, false, GlobalVariable::PrivateLinkage,
|
|
Constant::getNullValue(ArrayTy), "__sancov_gen_");
|
|
|
|
if (TargetTriple.supportsCOMDAT() && !F.isInterposable())
|
|
if (auto Comdat =
|
|
GetOrCreateFunctionComdat(F, TargetTriple, CurModuleUniqueId))
|
|
Array->setComdat(Comdat);
|
|
Array->setSection(getSectionName(Section));
|
|
Array->setAlignment(Ty->isPointerTy() ? DL->getPointerSize()
|
|
: Ty->getPrimitiveSizeInBits() / 8);
|
|
GlobalsToAppendToUsed.push_back(Array);
|
|
GlobalsToAppendToCompilerUsed.push_back(Array);
|
|
MDNode *MD = MDNode::get(F.getContext(), ValueAsMetadata::get(&F));
|
|
Array->addMetadata(LLVMContext::MD_associated, *MD);
|
|
|
|
return Array;
|
|
}
|
|
|
|
GlobalVariable *
|
|
SanitizerCoverage::CreatePCArray(Function &F,
|
|
ArrayRef<BasicBlock *> AllBlocks) {
|
|
size_t N = AllBlocks.size();
|
|
assert(N);
|
|
SmallVector<Constant *, 32> PCs;
|
|
IRBuilder<> IRB(&*F.getEntryBlock().getFirstInsertionPt());
|
|
for (size_t i = 0; i < N; i++) {
|
|
if (&F.getEntryBlock() == AllBlocks[i]) {
|
|
PCs.push_back((Constant *)IRB.CreatePointerCast(&F, IntptrPtrTy));
|
|
PCs.push_back((Constant *)IRB.CreateIntToPtr(
|
|
ConstantInt::get(IntptrTy, 1), IntptrPtrTy));
|
|
} else {
|
|
PCs.push_back((Constant *)IRB.CreatePointerCast(
|
|
BlockAddress::get(AllBlocks[i]), IntptrPtrTy));
|
|
PCs.push_back((Constant *)IRB.CreateIntToPtr(
|
|
ConstantInt::get(IntptrTy, 0), IntptrPtrTy));
|
|
}
|
|
}
|
|
auto *PCArray = CreateFunctionLocalArrayInSection(N * 2, F, IntptrPtrTy,
|
|
SanCovPCsSectionName);
|
|
PCArray->setInitializer(
|
|
ConstantArray::get(ArrayType::get(IntptrPtrTy, N * 2), PCs));
|
|
PCArray->setConstant(true);
|
|
|
|
return PCArray;
|
|
}
|
|
|
|
void SanitizerCoverage::CreateFunctionLocalArrays(
|
|
Function &F, ArrayRef<BasicBlock *> AllBlocks) {
|
|
if (Options.TracePCGuard)
|
|
FunctionGuardArray = CreateFunctionLocalArrayInSection(
|
|
AllBlocks.size(), F, Int32Ty, SanCovGuardsSectionName);
|
|
|
|
if (Options.Inline8bitCounters)
|
|
Function8bitCounterArray = CreateFunctionLocalArrayInSection(
|
|
AllBlocks.size(), F, Int8Ty, SanCovCountersSectionName);
|
|
|
|
if (Options.PCTable)
|
|
FunctionPCsArray = CreatePCArray(F, AllBlocks);
|
|
}
|
|
|
|
bool SanitizerCoverage::InjectCoverage(Function &F,
|
|
ArrayRef<BasicBlock *> AllBlocks,
|
|
bool IsLeafFunc) {
|
|
if (AllBlocks.empty()) return false;
|
|
CreateFunctionLocalArrays(F, AllBlocks);
|
|
for (size_t i = 0, N = AllBlocks.size(); i < N; i++)
|
|
InjectCoverageAtBlock(F, *AllBlocks[i], i, IsLeafFunc);
|
|
return true;
|
|
}
|
|
|
|
// On every indirect call we call a run-time function
|
|
// __sanitizer_cov_indir_call* with two parameters:
|
|
// - callee address,
|
|
// - global cache array that contains CacheSize pointers (zero-initialized).
|
|
// The cache is used to speed up recording the caller-callee pairs.
|
|
// The address of the caller is passed implicitly via caller PC.
|
|
// CacheSize is encoded in the name of the run-time function.
|
|
void SanitizerCoverage::InjectCoverageForIndirectCalls(
|
|
Function &F, ArrayRef<Instruction *> IndirCalls) {
|
|
if (IndirCalls.empty())
|
|
return;
|
|
assert(Options.TracePC || Options.TracePCGuard || Options.Inline8bitCounters);
|
|
for (auto I : IndirCalls) {
|
|
IRBuilder<> IRB(I);
|
|
CallSite CS(I);
|
|
Value *Callee = CS.getCalledValue();
|
|
if (isa<InlineAsm>(Callee))
|
|
continue;
|
|
IRB.CreateCall(SanCovTracePCIndir, IRB.CreatePointerCast(Callee, IntptrTy));
|
|
}
|
|
}
|
|
|
|
// For every switch statement we insert a call:
|
|
// __sanitizer_cov_trace_switch(CondValue,
|
|
// {NumCases, ValueSizeInBits, Case0Value, Case1Value, Case2Value, ... })
|
|
|
|
void SanitizerCoverage::InjectTraceForSwitch(
|
|
Function &, ArrayRef<Instruction *> SwitchTraceTargets) {
|
|
for (auto I : SwitchTraceTargets) {
|
|
if (SwitchInst *SI = dyn_cast<SwitchInst>(I)) {
|
|
IRBuilder<> IRB(I);
|
|
SmallVector<Constant *, 16> Initializers;
|
|
Value *Cond = SI->getCondition();
|
|
if (Cond->getType()->getScalarSizeInBits() >
|
|
Int64Ty->getScalarSizeInBits())
|
|
continue;
|
|
Initializers.push_back(ConstantInt::get(Int64Ty, SI->getNumCases()));
|
|
Initializers.push_back(
|
|
ConstantInt::get(Int64Ty, Cond->getType()->getScalarSizeInBits()));
|
|
if (Cond->getType()->getScalarSizeInBits() <
|
|
Int64Ty->getScalarSizeInBits())
|
|
Cond = IRB.CreateIntCast(Cond, Int64Ty, false);
|
|
for (auto It : SI->cases()) {
|
|
Constant *C = It.getCaseValue();
|
|
if (C->getType()->getScalarSizeInBits() <
|
|
Int64Ty->getScalarSizeInBits())
|
|
C = ConstantExpr::getCast(CastInst::ZExt, It.getCaseValue(), Int64Ty);
|
|
Initializers.push_back(C);
|
|
}
|
|
llvm::sort(Initializers.begin() + 2, Initializers.end(),
|
|
[](const Constant *A, const Constant *B) {
|
|
return cast<ConstantInt>(A)->getLimitedValue() <
|
|
cast<ConstantInt>(B)->getLimitedValue();
|
|
});
|
|
ArrayType *ArrayOfInt64Ty = ArrayType::get(Int64Ty, Initializers.size());
|
|
GlobalVariable *GV = new GlobalVariable(
|
|
*CurModule, ArrayOfInt64Ty, false, GlobalVariable::InternalLinkage,
|
|
ConstantArray::get(ArrayOfInt64Ty, Initializers),
|
|
"__sancov_gen_cov_switch_values");
|
|
IRB.CreateCall(SanCovTraceSwitchFunction,
|
|
{Cond, IRB.CreatePointerCast(GV, Int64PtrTy)});
|
|
}
|
|
}
|
|
}
|
|
|
|
void SanitizerCoverage::InjectTraceForDiv(
|
|
Function &, ArrayRef<BinaryOperator *> DivTraceTargets) {
|
|
for (auto BO : DivTraceTargets) {
|
|
IRBuilder<> IRB(BO);
|
|
Value *A1 = BO->getOperand(1);
|
|
if (isa<ConstantInt>(A1)) continue;
|
|
if (!A1->getType()->isIntegerTy())
|
|
continue;
|
|
uint64_t TypeSize = DL->getTypeStoreSizeInBits(A1->getType());
|
|
int CallbackIdx = TypeSize == 32 ? 0 :
|
|
TypeSize == 64 ? 1 : -1;
|
|
if (CallbackIdx < 0) continue;
|
|
auto Ty = Type::getIntNTy(*C, TypeSize);
|
|
IRB.CreateCall(SanCovTraceDivFunction[CallbackIdx],
|
|
{IRB.CreateIntCast(A1, Ty, true)});
|
|
}
|
|
}
|
|
|
|
void SanitizerCoverage::InjectTraceForGep(
|
|
Function &, ArrayRef<GetElementPtrInst *> GepTraceTargets) {
|
|
for (auto GEP : GepTraceTargets) {
|
|
IRBuilder<> IRB(GEP);
|
|
for (auto I = GEP->idx_begin(); I != GEP->idx_end(); ++I)
|
|
if (!isa<ConstantInt>(*I) && (*I)->getType()->isIntegerTy())
|
|
IRB.CreateCall(SanCovTraceGepFunction,
|
|
{IRB.CreateIntCast(*I, IntptrTy, true)});
|
|
}
|
|
}
|
|
|
|
void SanitizerCoverage::InjectTraceForCmp(
|
|
Function &, ArrayRef<Instruction *> CmpTraceTargets) {
|
|
for (auto I : CmpTraceTargets) {
|
|
if (ICmpInst *ICMP = dyn_cast<ICmpInst>(I)) {
|
|
IRBuilder<> IRB(ICMP);
|
|
Value *A0 = ICMP->getOperand(0);
|
|
Value *A1 = ICMP->getOperand(1);
|
|
if (!A0->getType()->isIntegerTy())
|
|
continue;
|
|
uint64_t TypeSize = DL->getTypeStoreSizeInBits(A0->getType());
|
|
int CallbackIdx = TypeSize == 8 ? 0 :
|
|
TypeSize == 16 ? 1 :
|
|
TypeSize == 32 ? 2 :
|
|
TypeSize == 64 ? 3 : -1;
|
|
if (CallbackIdx < 0) continue;
|
|
// __sanitizer_cov_trace_cmp((type_size << 32) | predicate, A0, A1);
|
|
auto CallbackFunc = SanCovTraceCmpFunction[CallbackIdx];
|
|
bool FirstIsConst = isa<ConstantInt>(A0);
|
|
bool SecondIsConst = isa<ConstantInt>(A1);
|
|
// If both are const, then we don't need such a comparison.
|
|
if (FirstIsConst && SecondIsConst) continue;
|
|
// If only one is const, then make it the first callback argument.
|
|
if (FirstIsConst || SecondIsConst) {
|
|
CallbackFunc = SanCovTraceConstCmpFunction[CallbackIdx];
|
|
if (SecondIsConst)
|
|
std::swap(A0, A1);
|
|
}
|
|
|
|
auto Ty = Type::getIntNTy(*C, TypeSize);
|
|
IRB.CreateCall(CallbackFunc, {IRB.CreateIntCast(A0, Ty, true),
|
|
IRB.CreateIntCast(A1, Ty, true)});
|
|
}
|
|
}
|
|
}
|
|
|
|
void SanitizerCoverage::InjectCoverageAtBlock(Function &F, BasicBlock &BB,
|
|
size_t Idx, bool IsLeafFunc) {
|
|
BasicBlock::iterator IP = BB.getFirstInsertionPt();
|
|
bool IsEntryBB = &BB == &F.getEntryBlock();
|
|
DebugLoc EntryLoc;
|
|
if (IsEntryBB) {
|
|
if (auto SP = F.getSubprogram())
|
|
EntryLoc = DebugLoc::get(SP->getScopeLine(), 0, SP);
|
|
// Keep static allocas and llvm.localescape calls in the entry block. Even
|
|
// if we aren't splitting the block, it's nice for allocas to be before
|
|
// calls.
|
|
IP = PrepareToSplitEntryBlock(BB, IP);
|
|
} else {
|
|
EntryLoc = IP->getDebugLoc();
|
|
}
|
|
|
|
IRBuilder<> IRB(&*IP);
|
|
IRB.SetCurrentDebugLocation(EntryLoc);
|
|
if (Options.TracePC) {
|
|
IRB.CreateCall(SanCovTracePC); // gets the PC using GET_CALLER_PC.
|
|
IRB.CreateCall(EmptyAsm, {}); // Avoids callback merge.
|
|
}
|
|
if (Options.TracePCGuard) {
|
|
auto GuardPtr = IRB.CreateIntToPtr(
|
|
IRB.CreateAdd(IRB.CreatePointerCast(FunctionGuardArray, IntptrTy),
|
|
ConstantInt::get(IntptrTy, Idx * 4)),
|
|
Int32PtrTy);
|
|
IRB.CreateCall(SanCovTracePCGuard, GuardPtr);
|
|
IRB.CreateCall(EmptyAsm, {}); // Avoids callback merge.
|
|
}
|
|
if (Options.Inline8bitCounters) {
|
|
auto CounterPtr = IRB.CreateGEP(
|
|
Function8bitCounterArray->getValueType(), Function8bitCounterArray,
|
|
{ConstantInt::get(IntptrTy, 0), ConstantInt::get(IntptrTy, Idx)});
|
|
auto Load = IRB.CreateLoad(Int8Ty, CounterPtr);
|
|
auto Inc = IRB.CreateAdd(Load, ConstantInt::get(Int8Ty, 1));
|
|
auto Store = IRB.CreateStore(Inc, CounterPtr);
|
|
SetNoSanitizeMetadata(Load);
|
|
SetNoSanitizeMetadata(Store);
|
|
}
|
|
if (Options.StackDepth && IsEntryBB && !IsLeafFunc) {
|
|
// Check stack depth. If it's the deepest so far, record it.
|
|
Module *M = F.getParent();
|
|
Function *GetFrameAddr = Intrinsic::getDeclaration(
|
|
M, Intrinsic::frameaddress,
|
|
IRB.getInt8PtrTy(M->getDataLayout().getAllocaAddrSpace()));
|
|
auto FrameAddrPtr =
|
|
IRB.CreateCall(GetFrameAddr, {Constant::getNullValue(Int32Ty)});
|
|
auto FrameAddrInt = IRB.CreatePtrToInt(FrameAddrPtr, IntptrTy);
|
|
auto LowestStack = IRB.CreateLoad(IntptrTy, SanCovLowestStack);
|
|
auto IsStackLower = IRB.CreateICmpULT(FrameAddrInt, LowestStack);
|
|
auto ThenTerm = SplitBlockAndInsertIfThen(IsStackLower, &*IP, false);
|
|
IRBuilder<> ThenIRB(ThenTerm);
|
|
auto Store = ThenIRB.CreateStore(FrameAddrInt, SanCovLowestStack);
|
|
SetNoSanitizeMetadata(LowestStack);
|
|
SetNoSanitizeMetadata(Store);
|
|
}
|
|
}
|
|
|
|
std::string
|
|
SanitizerCoverage::getSectionName(const std::string &Section) const {
|
|
if (TargetTriple.isOSBinFormatCOFF()) {
|
|
if (Section == SanCovCountersSectionName)
|
|
return ".SCOV$CM";
|
|
if (Section == SanCovPCsSectionName)
|
|
return ".SCOVP$M";
|
|
return ".SCOV$GM"; // For SanCovGuardsSectionName.
|
|
}
|
|
if (TargetTriple.isOSBinFormatMachO())
|
|
return "__DATA,__" + Section;
|
|
return "__" + Section;
|
|
}
|
|
|
|
std::string
|
|
SanitizerCoverage::getSectionStart(const std::string &Section) const {
|
|
return getSectionStartImpl(TargetTriple, Section);
|
|
}
|
|
|
|
std::string SanitizerCoverage::getSectionEnd(const std::string &Section) const {
|
|
return getSectionEndImpl(TargetTriple, Section);
|
|
}
|
|
|
|
INITIALIZE_PASS(ModuleSanitizerCoverageLegacyPass, "module-sancov",
|
|
"Pass for inserting sancov top-level initialization calls",
|
|
false, false)
|
|
|
|
char SanitizerCoverageLegacyPass::ID = 0;
|
|
INITIALIZE_PASS_BEGIN(SanitizerCoverageLegacyPass, "sancov",
|
|
"Pass for instrumenting coverage on functions", false,
|
|
false)
|
|
INITIALIZE_PASS_DEPENDENCY(ModuleSanitizerCoverageLegacyPass)
|
|
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
|
|
INITIALIZE_PASS_DEPENDENCY(PostDominatorTreeWrapperPass)
|
|
INITIALIZE_PASS_END(SanitizerCoverageLegacyPass, "sancov",
|
|
"Pass for instrumenting coverage on functions", false,
|
|
false)
|
|
FunctionPass *llvm::createSanitizerCoverageLegacyPassPass(
|
|
const SanitizerCoverageOptions &Options) {
|
|
return new SanitizerCoverageLegacyPass(Options);
|
|
}
|
|
ModulePass *llvm::createModuleSanitizerCoverageLegacyPassPass(
|
|
const SanitizerCoverageOptions &Options) {
|
|
return new ModuleSanitizerCoverageLegacyPass(Options);
|
|
}
|