1 //===- Transforms/Instrumentation.h - Instrumentation passes ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines constructor functions for instrumentation passes.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_TRANSFORMS_INSTRUMENTATION_H
15 #define LLVM_TRANSFORMS_INSTRUMENTATION_H
17 #include "llvm/ADT/StringRef.h"
18 #include "llvm/IR/BasicBlock.h"
25 #if defined(__GNUC__) && defined(__linux__) && !defined(ANDROID)
26 inline void *getDFSanArgTLSPtrForJIT() {
27 extern __thread __attribute__((tls_model("initial-exec")))
28 void *__dfsan_arg_tls;
29 return (void *)&__dfsan_arg_tls;
32 inline void *getDFSanRetValTLSPtrForJIT() {
33 extern __thread __attribute__((tls_model("initial-exec")))
34 void *__dfsan_retval_tls;
35 return (void *)&__dfsan_retval_tls;
44 /// Instrumentation passes often insert conditional checks into entry blocks.
45 /// Call this function before splitting the entry block to move instructions
46 /// that must remain in the entry block up before the split point. Static
47 /// allocas and llvm.localescape calls, for example, must remain in the entry
49 BasicBlock::iterator PrepareToSplitEntryBlock(BasicBlock &BB,
50 BasicBlock::iterator IP);
52 // Insert GCOV profiling instrumentation
54 static GCOVOptions getDefault();
56 // Specify whether to emit .gcno files.
59 // Specify whether to modify the program to emit .gcda files when run.
62 // A four-byte version string. The meaning of a version string is described in
66 // Emit a "cfg checksum" that follows the "line number checksum" of a
67 // function. This affects both .gcno and .gcda files.
70 // Add the 'noredzone' attribute to added runtime library calls.
73 // Emit the name of the function in the .gcda files. This is redundant, as
74 // the function identifier can be used to find the name from the .gcno file.
75 bool FunctionNamesInData;
77 // Emit the exit block immediately after the start block, rather than after
78 // all of the function body's blocks.
79 bool ExitBlockBeforeBody;
82 ModulePass *createGCOVProfilerPass(const GCOVOptions &Options =
83 GCOVOptions::getDefault());
86 ModulePass *createPGOInstrumentationGenLegacyPass();
88 createPGOInstrumentationUseLegacyPass(StringRef Filename = StringRef(""));
89 ModulePass *createPGOIndirectCallPromotionLegacyPass(bool InLTO = false,
90 bool SamplePGO = false);
92 // Helper function to check if it is legal to promote indirect call \p Inst
93 // to a direct call of function \p F. Stores the reason in \p Reason.
94 bool isLegalToPromote(Instruction *Inst, Function *F, const char **Reason);
96 // Helper function that transforms Inst (either an indirect-call instruction, or
97 // an invoke instruction , to a conditional call to F. This is like:
98 // if (Inst.CalledValue == F)
103 // TotalCount is the profile count value that the instruction executes.
104 // Count is the profile count value that F is the target function.
105 // These two values are used to update the branch weight.
106 // If \p AttachProfToDirectCall is true, a prof metadata is attached to the
107 // new direct call to contain \p Count.
108 // Returns the promoted direct call instruction.
109 Instruction *promoteIndirectCall(Instruction *Inst, Function *F, uint64_t Count,
111 bool AttachProfToDirectCall);
113 /// Options for the frontend instrumentation based profiling pass.
114 struct InstrProfOptions {
115 // Add the 'noredzone' attribute to added runtime library calls.
116 bool NoRedZone = false;
118 // Name of the profile file to use as output
119 std::string InstrProfileOutput;
121 InstrProfOptions() = default;
124 /// Insert frontend instrumentation based profiling.
125 ModulePass *createInstrProfilingLegacyPass(
126 const InstrProfOptions &Options = InstrProfOptions());
128 // Insert AddressSanitizer (address sanity checking) instrumentation
129 FunctionPass *createAddressSanitizerFunctionPass(bool CompileKernel = false,
130 bool Recover = false,
131 bool UseAfterScope = false);
132 ModulePass *createAddressSanitizerModulePass(bool CompileKernel = false,
133 bool Recover = false);
135 // Insert MemorySanitizer instrumentation (detection of uninitialized reads)
136 FunctionPass *createMemorySanitizerPass(int TrackOrigins = 0,
137 bool Recover = false);
139 // Insert ThreadSanitizer (race detection) instrumentation
140 FunctionPass *createThreadSanitizerPass();
142 // Insert DataFlowSanitizer (dynamic data flow analysis) instrumentation
143 ModulePass *createDataFlowSanitizerPass(
144 const std::vector<std::string> &ABIListFiles = std::vector<std::string>(),
145 void *(*getArgTLS)() = nullptr, void *(*getRetValTLS)() = nullptr);
147 // Options for EfficiencySanitizer sub-tools.
148 struct EfficiencySanitizerOptions {
153 } ToolType = ESAN_None;
155 EfficiencySanitizerOptions() = default;
158 // Insert EfficiencySanitizer instrumentation.
159 ModulePass *createEfficiencySanitizerPass(
160 const EfficiencySanitizerOptions &Options = EfficiencySanitizerOptions());
162 // Options for sanitizer coverage instrumentation.
163 struct SanitizerCoverageOptions {
169 } CoverageType = SCK_None;
170 bool IndirectCalls = false;
171 bool TraceBB = false;
172 bool TraceCmp = false;
173 bool TraceDiv = false;
174 bool TraceGep = false;
175 bool Use8bitCounters = false;
176 bool TracePC = false;
177 bool TracePCGuard = false;
179 SanitizerCoverageOptions() = default;
182 // Insert SanitizerCoverage instrumentation.
183 ModulePass *createSanitizerCoverageModulePass(
184 const SanitizerCoverageOptions &Options = SanitizerCoverageOptions());
186 #if defined(__GNUC__) && defined(__linux__) && !defined(ANDROID)
187 inline ModulePass *createDataFlowSanitizerPassForJIT(
188 const std::vector<std::string> &ABIListFiles = std::vector<std::string>()) {
189 return createDataFlowSanitizerPass(ABIListFiles, getDFSanArgTLSPtrForJIT,
190 getDFSanRetValTLSPtrForJIT);
194 // BoundsChecking - This pass instruments the code to perform run-time bounds
195 // checking on loads, stores, and other memory intrinsics.
196 FunctionPass *createBoundsCheckingPass();
198 /// \brief Calculate what to divide by to scale counts.
200 /// Given the maximum count, calculate a divisor that will scale all the
201 /// weights to strictly less than std::numeric_limits<uint32_t>::max().
202 static inline uint64_t calculateCountScale(uint64_t MaxCount) {
203 return MaxCount < std::numeric_limits<uint32_t>::max()
205 : MaxCount / std::numeric_limits<uint32_t>::max() + 1;
208 /// \brief Scale an individual branch count.
210 /// Scale a 64-bit weight down to 32-bits using \c Scale.
212 static inline uint32_t scaleBranchCount(uint64_t Count, uint64_t Scale) {
213 uint64_t Scaled = Count / Scale;
214 assert(Scaled <= std::numeric_limits<uint32_t>::max() && "overflow 32-bits");
218 } // end namespace llvm
220 #endif // LLVM_TRANSFORMS_INSTRUMENTATION_H