sanstats.cpp
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//===- sanstats.cpp - Sanitizer statistics dumper -------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This tool dumps statistics information from files in the format produced
// by clang's -fsanitize-stats feature.
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/Symbolize/Symbolize.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Transforms/Utils/SanitizerStats.h"
#include <stdint.h>
using namespace llvm;
static cl::opt<std::string> ClInputFile(cl::Positional, cl::Required,
cl::desc("<filename>"));
static cl::opt<bool> ClDemangle("demangle", cl::init(false),
cl::desc("Print demangled function name."));
inline uint64_t KindFromData(uint64_t Data, char SizeofPtr) {
return Data >> (SizeofPtr * 8 - kSanitizerStatKindBits);
}
inline uint64_t CountFromData(uint64_t Data, char SizeofPtr) {
return Data & ((1ull << (SizeofPtr * 8 - kSanitizerStatKindBits)) - 1);
}
static uint64_t ReadLE(char Size, const char *Begin, const char *End) {
uint64_t Result = 0;
char Pos = 0;
while (Begin < End && Pos != Size) {
Result |= uint64_t(uint8_t(*Begin)) << (Pos * 8);
++Begin;
++Pos;
}
return Result;
}
static const char *ReadModule(char SizeofPtr, const char *Begin,
const char *End) {
const char *FilenameBegin = Begin;
while (Begin != End && *Begin)
++Begin;
if (Begin == End)
return nullptr;
std::string Filename(FilenameBegin, Begin - FilenameBegin);
if (!llvm::sys::fs::exists(Filename))
Filename = std::string(llvm::sys::path::parent_path(ClInputFile)) +
std::string(llvm::sys::path::filename(Filename));
++Begin;
if (Begin == End)
return nullptr;
symbolize::LLVMSymbolizer::Options SymbolizerOptions;
SymbolizerOptions.Demangle = ClDemangle;
SymbolizerOptions.UseSymbolTable = true;
symbolize::LLVMSymbolizer Symbolizer(SymbolizerOptions);
while (1) {
uint64_t Addr = ReadLE(SizeofPtr, Begin, End);
Begin += SizeofPtr;
uint64_t Data = ReadLE(SizeofPtr, Begin, End);
Begin += SizeofPtr;
if (Begin > End)
return nullptr;
if (Addr == 0 && Data == 0)
return Begin;
if (Begin == End)
return nullptr;
// As the instrumentation tracks the return address and not
// the address of the call to `__sanitizer_stat_report` we
// remove one from the address to get the correct DI.
// TODO: it would be neccessary to set proper section index here.
// object::SectionedAddress::UndefSection works for only absolute addresses.
if (Expected<DILineInfo> LineInfo = Symbolizer.symbolizeCode(
Filename, {Addr - 1, object::SectionedAddress::UndefSection})) {
llvm::outs() << format_hex(Addr - 1, 18) << ' ' << LineInfo->FileName
<< ':' << LineInfo->Line << ' ' << LineInfo->FunctionName
<< ' ';
} else {
logAllUnhandledErrors(LineInfo.takeError(), llvm::outs(), "<error> ");
}
switch (KindFromData(Data, SizeofPtr)) {
case SanStat_CFI_VCall:
llvm::outs() << "cfi-vcall";
break;
case SanStat_CFI_NVCall:
llvm::outs() << "cfi-nvcall";
break;
case SanStat_CFI_DerivedCast:
llvm::outs() << "cfi-derived-cast";
break;
case SanStat_CFI_UnrelatedCast:
llvm::outs() << "cfi-unrelated-cast";
break;
case SanStat_CFI_ICall:
llvm::outs() << "cfi-icall";
break;
default:
llvm::outs() << "<unknown>";
break;
}
llvm::outs() << " " << CountFromData(Data, SizeofPtr) << '\n';
}
}
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv,
"Sanitizer Statistics Processing Tool");
ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr =
MemoryBuffer::getFile(ClInputFile, -1, false);
if (!MBOrErr) {
errs() << argv[0] << ": " << ClInputFile << ": "
<< MBOrErr.getError().message() << '\n';
return 1;
}
std::unique_ptr<MemoryBuffer> MB = std::move(MBOrErr.get());
const char *Begin = MB->getBufferStart(), *End = MB->getBufferEnd();
if (Begin == End) {
errs() << argv[0] << ": " << ClInputFile << ": short read\n";
return 1;
}
char SizeofPtr = *Begin++;
while (Begin != End) {
Begin = ReadModule(SizeofPtr, Begin, End);
if (Begin == nullptr) {
errs() << argv[0] << ": " << ClInputFile << ": short read\n";
return 1;
}
assert(Begin <= End);
}
}