[Profile] Add binary profile correlation for code coverage.

clang/lib/CodeGen/BackendUtil.cpp

@@ -42,6 +42,7 @@
 #include "llvm/Passes/PassBuilder.h"
 #include "llvm/Passes/PassPlugin.h"
 #include "llvm/Passes/StandardInstrumentations.h"
+#include "llvm/ProfileData/InstrProfCorrelator.h"
 #include "llvm/Support/BuryPointer.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/MemoryBuffer.h"
@@ -55,6 +56,7 @@
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/TargetParser/SubtargetFeature.h"
 #include "llvm/TargetParser/Triple.h"
+#include "llvm/Transforms/HipStdPar/HipStdPar.h"
 #include "llvm/Transforms/IPO/EmbedBitcodePass.h"
 #include "llvm/Transforms/IPO/LowerTypeTests.h"
 #include "llvm/Transforms/IPO/ThinLTOBitcodeWriter.h"
@@ -78,7 +80,6 @@
 #include "llvm/Transforms/Scalar/EarlyCSE.h"
 #include "llvm/Transforms/Scalar/GVN.h"
 #include "llvm/Transforms/Scalar/JumpThreading.h"
-#include "llvm/Transforms/HipStdPar/HipStdPar.h"
 #include "llvm/Transforms/Utils/Debugify.h"
 #include "llvm/Transforms/Utils/EntryExitInstrumenter.h"
 #include "llvm/Transforms/Utils/ModuleUtils.h"
@@ -98,13 +99,16 @@ extern cl::opt<bool> PrintPipelinePasses;
 static cl::opt<bool> ClSanitizeOnOptimizerEarlyEP(
     "sanitizer-early-opt-ep", cl::Optional,
     cl::desc("Insert sanitizers on OptimizerEarlyEP."), cl::init(false));
-}
+
+extern cl::opt<InstrProfCorrelator::ProfCorrelatorKind> ProfileCorrelate;
+} // namespace llvm
 
 namespace {
 
 // Default filename used for profile generation.
 std::string getDefaultProfileGenName() {
-  return DebugInfoCorrelate ? "default_%m.proflite" : "default_%m.profraw";
+  return ProfileCorrelate.getNumOccurrences() ? "default_%m.proflite"
+                                              : "default_%m.profraw";
 }
 
 class EmitAssemblyHelper {
@@ -197,7 +201,7 @@ class EmitAssemblyHelper {
   void EmitAssembly(BackendAction Action,
                     std::unique_ptr<raw_pwrite_stream> OS);
 };
-}
+} // namespace
 
 static SanitizerCoverageOptions
 getSancovOptsFromCGOpts(const CodeGenOptions &CGOpts) {

clang/lib/CodeGen/CoverageMappingGen.cpp

@@ -31,6 +31,10 @@
 // is textually included.
 #define COVMAP_V3
 
+namespace llvm {
+extern cl::opt<InstrProfCorrelator::ProfCorrelatorKind> ProfileCorrelate;
+} // namespace llvm
+
 static llvm::cl::opt<bool> EmptyLineCommentCoverage(
     "emptyline-comment-coverage",
     llvm::cl::desc("Emit emptylines and comment lines as skipped regions (only "
@@ -1831,6 +1835,22 @@ void CoverageMappingModuleGen::emit() {
                              llvm::GlobalValue::InternalLinkage, NamesArrVal,
                              llvm::getCoverageUnusedNamesVarName());
   }
+  const StringRef VarName(INSTR_PROF_QUOTE(INSTR_PROF_RAW_VERSION_VAR));
+  llvm::Type *IntTy64 = llvm::Type::getInt64Ty(Ctx);
+  uint64_t ProfileVersion = INSTR_PROF_RAW_VERSION;
+  if (llvm::ProfileCorrelate == llvm::InstrProfCorrelator::BINARY)
+    ProfileVersion |= VARIANT_MASK_BIN_CORRELATE;
+  auto *VersionVariable = new llvm::GlobalVariable(
+      CGM.getModule(), llvm::Type::getInt64Ty(Ctx), true,
+      llvm::GlobalValue::WeakAnyLinkage,
+      llvm::Constant::getIntegerValue(IntTy64, llvm::APInt(64, ProfileVersion)),
+      VarName);
+  VersionVariable->setVisibility(llvm::GlobalValue::HiddenVisibility);
+  llvm::Triple TT(CGM.getModule().getTargetTriple());
+  if (TT.supportsCOMDAT()) {
+    VersionVariable->setLinkage(llvm::GlobalValue::ExternalLinkage);
+    VersionVariable->setComdat(CGM.getModule().getOrInsertComdat(VarName));
+  }
 }
 
 unsigned CoverageMappingModuleGen::getFileID(FileEntryRef File) {

clang/test/CodeGen/coverage-profile-raw-version.c

@@ -0,0 +1,9 @@
+// RUN: %clang_cc1  -fprofile-instrument=clang -fcoverage-mapping -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -mllvm -profile-correlate=binary -fprofile-instrument=clang -fcoverage-mapping -emit-llvm -o - %s | FileCheck %s --check-prefix=BIN-CORRELATE
+
+// CHECK: @__llvm_profile_raw_version = {{.*}} i64 8
+// BIN-CORRELATE: @__llvm_profile_raw_version = {{.*}} i64 4294967304
+
+int main() {
+    return 0;
+}

compiler-rt/include/profile/InstrProfData.inc

@@ -655,6 +655,7 @@ serializeValueProfDataFrom(ValueProfRecordClosure *Closure,
  * version for other variants of profile. We set the 8th most significant bit 
  * (i.e. bit 56) to 1 to indicate if this is an IR-level instrumentation
  * generated profile, and 0 if this is a Clang FE generated profile.
+ * 1 in bit 32 indicates there is no profile name and data sections.
  * 1 in bit 57 indicates there are context-sensitive records in the profile.
  * The 59th bit indicates whether to use debug info to correlate profiles.
  * The 60th bit indicates single byte coverage instrumentation.
@@ -664,6 +665,7 @@ serializeValueProfDataFrom(ValueProfRecordClosure *Closure,
  */
 #define VARIANT_MASKS_ALL 0xffffffff00000000ULL
 #define GET_VERSION(V) ((V) & ~VARIANT_MASKS_ALL)
+#define VARIANT_MASK_BIN_CORRELATE (0x1ULL << 32)
 #define VARIANT_MASK_IR_PROF (0x1ULL << 56)
 #define VARIANT_MASK_CSIR_PROF (0x1ULL << 57)
 #define VARIANT_MASK_INSTR_ENTRY (0x1ULL << 58)

compiler-rt/lib/profile/InstrProfiling.h

@@ -267,6 +267,9 @@ uint64_t __llvm_profile_get_num_data(const __llvm_profile_data *Begin,
 uint64_t __llvm_profile_get_data_size(const __llvm_profile_data *Begin,
                                       const __llvm_profile_data *End);
 
+/*! \brief Get the size of the profile name section in bytes. */
+uint64_t __llvm_profile_get_name_size(const char *Begin, const char *End);
+
 /*! \brief Get the size in bytes of a single counter entry. */
 size_t __llvm_profile_counter_entry_size(void);
 

compiler-rt/lib/profile/InstrProfilingBuffer.c

@@ -53,6 +53,9 @@ uint64_t __llvm_profile_get_size_for_buffer(void) {
 COMPILER_RT_VISIBILITY
 uint64_t __llvm_profile_get_num_data(const __llvm_profile_data *Begin,
                                      const __llvm_profile_data *End) {
+  if ((__llvm_profile_get_version() & VARIANT_MASK_DBG_CORRELATE) ||
+      (__llvm_profile_get_version() & VARIANT_MASK_BIN_CORRELATE))
+    return 0;
   intptr_t BeginI = (intptr_t)Begin, EndI = (intptr_t)End;
   return ((EndI + sizeof(__llvm_profile_data) - 1) - BeginI) /
          sizeof(__llvm_profile_data);
@@ -61,9 +64,20 @@ uint64_t __llvm_profile_get_num_data(const __llvm_profile_data *Begin,
 COMPILER_RT_VISIBILITY
 uint64_t __llvm_profile_get_data_size(const __llvm_profile_data *Begin,
                                       const __llvm_profile_data *End) {
+  if ((__llvm_profile_get_version() & VARIANT_MASK_DBG_CORRELATE) ||
+      (__llvm_profile_get_version() & VARIANT_MASK_BIN_CORRELATE))
+    return 0;
   return __llvm_profile_get_num_data(Begin, End) * sizeof(__llvm_profile_data);
 }
 
+COMPILER_RT_VISIBILITY
+uint64_t __llvm_profile_get_name_size(const char *Begin, const char *End) {
+  if ((__llvm_profile_get_version() & VARIANT_MASK_DBG_CORRELATE) ||
+      (__llvm_profile_get_version() & VARIANT_MASK_BIN_CORRELATE))
+    return 0;
+  return End - Begin;
+}
+
 COMPILER_RT_VISIBILITY size_t __llvm_profile_counter_entry_size(void) {
   if (__llvm_profile_get_version() & VARIANT_MASK_BYTE_COVERAGE)
     return sizeof(uint8_t);

compiler-rt/lib/profile/InstrProfilingMerge.c

@@ -66,8 +66,9 @@ int __llvm_profile_check_compatibility(const char *ProfileData,
       Header->NumCounters !=
           __llvm_profile_get_num_counters(__llvm_profile_begin_counters(),
                                           __llvm_profile_end_counters()) ||
-      Header->NamesSize != (uint64_t)(__llvm_profile_end_names() -
-                                      __llvm_profile_begin_names()) ||
+      Header->NamesSize !=
+          __llvm_profile_get_name_size(__llvm_profile_begin_names(),
+                                       __llvm_profile_end_names()) ||
       Header->ValueKindLast != IPVK_Last)
     return 1;
 
@@ -132,7 +133,8 @@ int __llvm_profile_merge_from_buffer(const char *ProfileData,
 
   // Merge counters by iterating the entire counter section when debug info
   // correlation is enabled.
-  if (__llvm_profile_get_version() & VARIANT_MASK_DBG_CORRELATE) {
+  if ((__llvm_profile_get_version() & VARIANT_MASK_DBG_CORRELATE) ||
+      (__llvm_profile_get_version() & VARIANT_MASK_BIN_CORRELATE)) {
     for (SrcCounter = SrcCountersStart,
         DstCounter = __llvm_profile_begin_counters();
          SrcCounter < SrcCountersEnd;) {

compiler-rt/lib/profile/InstrProfilingPlatformWindows.c

@@ -13,8 +13,6 @@
 
 #if defined(_MSC_VER)
 /* Merge read-write sections into .data. */
-#pragma comment(linker, "/MERGE:.lprfc=.data")
-#pragma comment(linker, "/MERGE:.lprfd=.data")
 #pragma comment(linker, "/MERGE:.lprfv=.data")
 #pragma comment(linker, "/MERGE:.lprfnd=.data")
 /* Do *NOT* merge .lprfn and .lcovmap into .rdata. llvm-cov must be able to find

compiler-rt/lib/profile/InstrProfilingWriter.c

@@ -259,19 +259,19 @@ lprofWriteDataImpl(ProfDataWriter *Writer, const __llvm_profile_data *DataBegin,
                    const char *CountersBegin, const char *CountersEnd,
                    VPDataReaderType *VPDataReader, const char *NamesBegin,
                    const char *NamesEnd, int SkipNameDataWrite) {
-  int DebugInfoCorrelate =
-      (__llvm_profile_get_version() & VARIANT_MASK_DBG_CORRELATE) != 0ULL;
+  int ProfileCorrelation =
+      (__llvm_profile_get_version() & VARIANT_MASK_DBG_CORRELATE) ||
+      (__llvm_profile_get_version() & VARIANT_MASK_BIN_CORRELATE);
 
   /* Calculate size of sections. */
   const uint64_t DataSectionSize =
-      DebugInfoCorrelate ? 0 : __llvm_profile_get_data_size(DataBegin, DataEnd);
-  const uint64_t NumData =
-      DebugInfoCorrelate ? 0 : __llvm_profile_get_num_data(DataBegin, DataEnd);
+      __llvm_profile_get_data_size(DataBegin, DataEnd);
+  const uint64_t NumData = __llvm_profile_get_num_data(DataBegin, DataEnd);
   const uint64_t CountersSectionSize =
       __llvm_profile_get_counters_size(CountersBegin, CountersEnd);
   const uint64_t NumCounters =
       __llvm_profile_get_num_counters(CountersBegin, CountersEnd);
-  const uint64_t NamesSize = DebugInfoCorrelate ? 0 : NamesEnd - NamesBegin;
+  const uint64_t NamesSize = __llvm_profile_get_name_size(NamesBegin, NamesEnd);
 
   /* Create the header. */
   __llvm_profile_header Header;
@@ -298,7 +298,7 @@ lprofWriteDataImpl(ProfDataWriter *Writer, const __llvm_profile_data *DataBegin,
 #endif
 
   /* The data and names sections are omitted in lightweight mode. */
-  if (DebugInfoCorrelate) {
+  if (ProfileCorrelation) {
     Header.CountersDelta = 0;
     Header.NamesDelta = 0;
   }
@@ -314,19 +314,19 @@ lprofWriteDataImpl(ProfDataWriter *Writer, const __llvm_profile_data *DataBegin,
 
   /* Write the profile data. */
   ProfDataIOVec IOVecData[] = {
-      {DebugInfoCorrelate ? NULL : DataBegin, sizeof(uint8_t), DataSectionSize,
+      {ProfileCorrelation ? NULL : DataBegin, sizeof(uint8_t), DataSectionSize,
        0},
       {NULL, sizeof(uint8_t), PaddingBytesBeforeCounters, 1},
       {CountersBegin, sizeof(uint8_t), CountersSectionSize, 0},
       {NULL, sizeof(uint8_t), PaddingBytesAfterCounters, 1},
-      {(SkipNameDataWrite || DebugInfoCorrelate) ? NULL : NamesBegin,
+      {(SkipNameDataWrite || ProfileCorrelation) ? NULL : NamesBegin,
        sizeof(uint8_t), NamesSize, 0},
       {NULL, sizeof(uint8_t), PaddingBytesAfterNames, 1}};
   if (Writer->Write(Writer, IOVecData, sizeof(IOVecData) / sizeof(*IOVecData)))
     return -1;
-
-  /* Value profiling is not yet supported in continuous mode. */
-  if (__llvm_profile_is_continuous_mode_enabled())
+  /* Value profiling is not yet supported in continuous mode and profile
+   * correlation mode. */
+  if (__llvm_profile_is_continuous_mode_enabled() || ProfileCorrelation)
     return 0;
 
   return writeValueProfData(Writer, VPDataReader, DataBegin, DataEnd);

compiler-rt/test/CMakeLists.txt

@@ -37,8 +37,9 @@ if(NOT ANDROID)
   if(NOT COMPILER_RT_STANDALONE_BUILD AND NOT LLVM_RUNTIMES_BUILD)
     # Use LLVM utils and Clang from the same build tree.
     list(APPEND SANITIZER_COMMON_LIT_TEST_DEPS
-      clang clang-resource-headers FileCheck count not llvm-config llvm-nm llvm-objdump
-      llvm-readelf llvm-readobj llvm-size llvm-symbolizer compiler-rt-headers sancov split-file)
+      clang clang-resource-headers FileCheck count not llvm-config llvm-nm 
+      llvm-objdump llvm-readelf llvm-readobj llvm-size llvm-symbolizer 
+      compiler-rt-headers sancov split-file llvm-strip)
     if (WIN32)
       list(APPEND SANITIZER_COMMON_LIT_TEST_DEPS KillTheDoctor)
     endif()

compiler-rt/test/profile/Darwin/instrprof-debug-info-correlate.c

@@ -1,5 +1,5 @@
 // Value profiling is currently not supported in lightweight mode.
-// RUN: %clang_pgogen -o %t -g -mllvm --debug-info-correlate -mllvm --disable-vp=true %S/../Inputs/instrprof-debug-info-correlate-main.cpp %S/../Inputs/instrprof-debug-info-correlate-foo.cpp
+// RUN: %clang_pgogen -o %t -g -mllvm --profile-correlate=debug-info -mllvm --disable-vp=true %S/../Inputs/instrprof-debug-info-correlate-main.cpp %S/../Inputs/instrprof-debug-info-correlate-foo.cpp
 // RUN: env LLVM_PROFILE_FILE=%t.proflite %run %t
 // RUN: llvm-profdata merge -o %t.profdata --debug-info=%t.dSYM %t.proflite
 
@@ -9,7 +9,7 @@
 
 // RUN: diff <(llvm-profdata show --all-functions --counts %t.normal.profdata) <(llvm-profdata show --all-functions --counts %t.profdata)
 
-// RUN: %clang_pgogen -o %t.cov -g -mllvm --debug-info-correlate -mllvm -pgo-function-entry-coverage -mllvm --disable-vp=true %S/../Inputs/instrprof-debug-info-correlate-main.cpp %S/../Inputs/instrprof-debug-info-correlate-foo.cpp
+// RUN: %clang_pgogen -o %t.cov -g -mllvm --profile-correlate=debug-info -mllvm -pgo-function-entry-coverage -mllvm --disable-vp=true %S/../Inputs/instrprof-debug-info-correlate-main.cpp %S/../Inputs/instrprof-debug-info-correlate-foo.cpp
 // RUN: env LLVM_PROFILE_FILE=%t.cov.proflite %run %t.cov
 // RUN: llvm-profdata merge -o %t.cov.profdata --debug-info=%t.cov.dSYM %t.cov.proflite
 

compiler-rt/test/profile/Linux/instrprof-debug-info-correlate-warnings.c

@@ -1,6 +1,6 @@
 // Disable full debug info and verify that we get warnings during merging
 
-// RUN: %clang_pgogen -o %t -gline-tables-only -mllvm --debug-info-correlate -mllvm --disable-vp=true %S/../Inputs/instrprof-debug-info-correlate-main.cpp %S/../Inputs/instrprof-debug-info-correlate-foo.cpp
+// RUN: %clang_pgogen -o %t -gline-tables-only -mllvm --profile-correlate=debug-info -mllvm --disable-vp=true %S/../Inputs/instrprof-debug-info-correlate-main.cpp %S/../Inputs/instrprof-debug-info-correlate-foo.cpp
 // RUN: env LLVM_PROFILE_FILE=%t.proflite %run %t
 // RUN: llvm-profdata merge -o %t.profdata --debug-info=%t %t.proflite --max-debug-info-correlation-warnings=2 2>&1 >/dev/null | FileCheck %s --check-prefixes=CHECK,LIMIT --implicit-check-not=warning
 // RUN: llvm-profdata merge -o %t.profdata --debug-info=%t %t.proflite --max-debug-info-correlation-warnings=0 2>&1 >/dev/null | FileCheck %s --check-prefixes=CHECK,NOLIMIT --implicit-check-not=warning

compiler-rt/test/profile/Linux/instrprof-debug-info-correlate.c

@@ -3,19 +3,19 @@
 // RUN: env LLVM_PROFILE_FILE=%t.profraw %run %t.normal
 // RUN: llvm-profdata merge -o %t.normal.profdata %t.profraw
 
-// RUN: %clang_pgogen -o %t.d4 -g -gdwarf-4 -mllvm --debug-info-correlate -mllvm --disable-vp=true %S/../Inputs/instrprof-debug-info-correlate-main.cpp %S/../Inputs/instrprof-debug-info-correlate-foo.cpp
+// RUN: %clang_pgogen -o %t.d4 -g -gdwarf-4 -mllvm --profile-correlate=debug-info -mllvm --disable-vp=true %S/../Inputs/instrprof-debug-info-correlate-main.cpp %S/../Inputs/instrprof-debug-info-correlate-foo.cpp
 // RUN: env LLVM_PROFILE_FILE=%t.d4.proflite %run %t.d4
 // RUN: llvm-profdata merge -o %t.d4.profdata --debug-info=%t.d4 %t.d4.proflite
 
 // RUN: diff <(llvm-profdata show --all-functions --counts %t.normal.profdata) <(llvm-profdata show --all-functions --counts %t.d4.profdata)
 
-// RUN: %clang_pgogen -o %t -g -mllvm --debug-info-correlate -mllvm --disable-vp=true %S/../Inputs/instrprof-debug-info-correlate-main.cpp %S/../Inputs/instrprof-debug-info-correlate-foo.cpp
+// RUN: %clang_pgogen -o %t -g -mllvm --profile-correlate=debug-info -mllvm --disable-vp=true %S/../Inputs/instrprof-debug-info-correlate-main.cpp %S/../Inputs/instrprof-debug-info-correlate-foo.cpp
 // RUN: env LLVM_PROFILE_FILE=%t.proflite %run %t
 // RUN: llvm-profdata merge -o %t.profdata --debug-info=%t %t.proflite
 
 // RUN: diff <(llvm-profdata show --all-functions --counts %t.normal.profdata) <(llvm-profdata show --all-functions --counts %t.profdata)
 
-// RUN: %clang_pgogen -o %t.cov -g -mllvm --debug-info-correlate -mllvm -pgo-function-entry-coverage -mllvm --disable-vp=true %S/../Inputs/instrprof-debug-info-correlate-main.cpp %S/../Inputs/instrprof-debug-info-correlate-foo.cpp
+// RUN: %clang_pgogen -o %t.cov -g -mllvm --profile-correlate=debug-info -mllvm -pgo-function-entry-coverage -mllvm --disable-vp=true %S/../Inputs/instrprof-debug-info-correlate-main.cpp %S/../Inputs/instrprof-debug-info-correlate-foo.cpp
 // RUN: env LLVM_PROFILE_FILE=%t.cov.proflite %run %t.cov
 // RUN: llvm-profdata merge -o %t.cov.profdata --debug-info=%t.cov %t.cov.proflite
 

compiler-rt/test/profile/Linux/instrprof-show-debug-info-correlation.c

@@ -1,10 +1,10 @@
-// RUN: %clang_pgogen -o %t -g -mllvm --debug-info-correlate -mllvm --disable-vp=true %s
+// RUN: %clang_pgogen -o %t -g -mllvm --profile-correlate=debug-info -mllvm --disable-vp=true %s
 // RUN: llvm-profdata show --debug-info=%t --detailed-summary --show-prof-sym-list | FileCheck %s
 // RUN: llvm-profdata show --debug-info=%t --show-format=yaml | FileCheck %s --match-full-lines --check-prefix YAML
 
-// RUN: %clang_pgogen -o %t.no.dbg -mllvm --debug-info-correlate -mllvm --disable-vp=true %s
+// RUN: %clang_pgogen -o %t.no.dbg -mllvm --profile-correlate=debug-info -mllvm --disable-vp=true %s
 // RUN: not llvm-profdata show --debug-info=%t.no.dbg 2>&1 | FileCheck %s --check-prefix NO-DBG
-// NO-DBG: unable to correlate profile: could not find any profile metadata in debug info
+// NO-DBG: unable to correlate profile: could not find any profile data metadata in correlated file
 
 // YAML: Probes:
 // YAML:   - Function Name:   a

compiler-rt/test/profile/instrprof-binary-correlate.c

@@ -0,0 +1,46 @@
+// REQUIRES: linux || windows
+// Default
+// RUN: %clang -o %t.normal -fprofile-instr-generate -fcoverage-mapping -fuse-ld=lld %S/Inputs/instrprof-debug-info-correlate-main.cpp %S/Inputs/instrprof-debug-info-correlate-foo.cpp
+// RUN: env LLVM_PROFILE_FILE=%t.profraw %run %t.normal
+// RUN: llvm-profdata merge -o %t.normal.profdata %t.profraw
+// RUN: llvm-cov report --instr-profile=%t.normal.profdata %t.normal > %t.normal.report
+// RUN: llvm-cov show --instr-profile=%t.normal.profdata %t.normal > %t.normal.show
+
+// With -profile-correlate=binary flag
+// RUN: %clang -o %t-1.exe -fprofile-instr-generate -fcoverage-mapping -mllvm -profile-correlate=binary -fuse-ld=lld %S/Inputs/instrprof-debug-info-correlate-main.cpp %S/Inputs/instrprof-debug-info-correlate-foo.cpp
+// RUN: env LLVM_PROFILE_FILE=%t-1.profraw %run %t-1.exe
+// RUN: llvm-profdata merge -o %t-1.profdata --binary-file=%t-1.exe %t-1.profraw
+// RUN: llvm-cov report --instr-profile=%t-1.profdata %t-1.exe > %t-1.report
+// RUN: llvm-cov show --instr-profile=%t-1.profdata %t-1.exe > %t-1.show
+// RUN: diff %t.normal.profdata %t-1.profdata
+// RUN: diff %t.normal.report %t-1.report
+// RUN: diff %t.normal.show %t-1.show
+
+// Strip above binary and run
+// RUN: llvm-strip %t-1.exe -o %t-2.exe
+// RUN: env LLVM_PROFILE_FILE=%t-2.profraw %run %t-2.exe
+// RUN: llvm-profdata merge -o %t-2.profdata --binary-file=%t-1.exe %t-2.profraw
+// RUN: llvm-cov report --instr-profile=%t-2.profdata %t-1.exe > %t-2.report
+// RUN: llvm-cov show --instr-profile=%t-2.profdata %t-1.exe > %t-2.show
+// RUN: diff %t.normal.profdata %t-2.profdata
+// RUN: diff %t.normal.report %t-2.report
+// RUN: diff %t.normal.show %t-2.show
+
+// Online merging.
+// RUN: env LLVM_PROFILE_FILE=%t-3.profraw %run %t.normal
+// RUN: env LLVM_PROFILE_FILE=%t-4.profraw %run %t.normal
+// RUN: llvm-profdata merge -o %t.normal.merged.profdata %t-3.profraw %t-4.profraw
+// RUN: llvm-cov report --instr-profile=%t.normal.merged.profdata %t.normal > %t.normal.merged.report
+// RUN: llvm-cov show --instr-profile=%t.normal.merged.profdata %t.normal > %t.normal.merged.show
+
+// RUN: rm -rf %t.profdir && mkdir %t.profdir
+// RUN: env LLVM_PROFILE_FILE=%t.profdir/%m-4.profraw %run %t-2.exe
+// RUN: env LLVM_PROFILE_FILE=%t.profdir/%m-4.profraw %run %t-2.exe
+// RUN: llvm-profdata merge -o %t-4.profdata --binary-file=%t-1.exe  %t.profdir
+// RUN: llvm-cov report --instr-profile=%t-4.profdata %t-1.exe > %t-4.report
+// RUN: llvm-cov show --instr-profile=%t-4.profdata %t-1.exe > %t-4.show
+// RUN: diff %t.normal.merged.profdata %t-4.profdata
+// RUN: diff %t.normal.merged.report %t-4.report
+// RUN: diff %t.normal.merged.show %t-4.show
+
+// TODO: After adding support for binary ID, test binaries with different binary IDs.