1197 lines
44 KiB
C++
1197 lines
44 KiB
C++
//===-- PerfReader.cpp - perfscript reader ---------------------*- C++ -*-===//
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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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#include "PerfReader.h"
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#include "ProfileGenerator.h"
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#include "llvm/DebugInfo/Symbolize/SymbolizableModule.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Process.h"
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#define DEBUG_TYPE "perf-reader"
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cl::opt<bool> SkipSymbolization("skip-symbolization",
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cl::desc("Dump the unsymbolized profile to the "
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"output file. It will show unwinder "
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"output for CS profile generation."));
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static cl::opt<bool> ShowMmapEvents("show-mmap-events",
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cl::desc("Print binary load events."));
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static cl::opt<bool>
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UseOffset("use-offset", cl::init(true),
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cl::desc("Work with `--skip-symbolization` or "
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"`--unsymbolized-profile` to write/read the "
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"offset instead of virtual address."));
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static cl::opt<bool> UseLoadableSegmentAsBase(
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"use-first-loadable-segment-as-base",
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cl::desc("Use first loadable segment address as base address "
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"for offsets in unsymbolized profile. By default "
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"first executable segment address is used"));
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static cl::opt<bool>
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IgnoreStackSamples("ignore-stack-samples",
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cl::desc("Ignore call stack samples for hybrid samples "
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"and produce context-insensitive profile."));
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cl::opt<bool> ShowDetailedWarning("show-detailed-warning",
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cl::desc("Show detailed warning message."));
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extern cl::opt<std::string> PerfTraceFilename;
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extern cl::opt<bool> ShowDisassemblyOnly;
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extern cl::opt<bool> ShowSourceLocations;
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extern cl::opt<std::string> OutputFilename;
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namespace llvm {
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namespace sampleprof {
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void VirtualUnwinder::unwindCall(UnwindState &State) {
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uint64_t Source = State.getCurrentLBRSource();
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auto *ParentFrame = State.getParentFrame();
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// The 2nd frame after leaf could be missing if stack sample is
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// taken when IP is within prolog/epilog, as frame chain isn't
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// setup yet. Fill in the missing frame in that case.
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// TODO: Currently we just assume all the addr that can't match the
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// 2nd frame is in prolog/epilog. In the future, we will switch to
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// pro/epi tracker(Dwarf CFI) for the precise check.
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if (ParentFrame == State.getDummyRootPtr() ||
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ParentFrame->Address != Source) {
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State.switchToFrame(Source);
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if (ParentFrame != State.getDummyRootPtr()) {
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if (Source == ExternalAddr)
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NumMismatchedExtCallBranch++;
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else
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NumMismatchedProEpiBranch++;
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}
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} else {
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State.popFrame();
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}
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State.InstPtr.update(Source);
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}
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void VirtualUnwinder::unwindLinear(UnwindState &State, uint64_t Repeat) {
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InstructionPointer &IP = State.InstPtr;
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uint64_t Target = State.getCurrentLBRTarget();
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uint64_t End = IP.Address;
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if (End == ExternalAddr && Target == ExternalAddr) {
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// Filter out the case when leaf external frame matches the external LBR
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// target, this is a valid state, it happens that the code run into external
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// address then return back. The call frame under the external frame
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// remains valid and can be unwound later, just skip recording this range.
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NumPairedExtAddr++;
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return;
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}
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if (End == ExternalAddr || Target == ExternalAddr) {
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// Range is invalid if only one point is external address. This means LBR
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// traces contains a standalone external address failing to pair another
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// one, likely due to interrupt jmp or broken perf script. Set the
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// state to invalid.
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NumUnpairedExtAddr++;
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State.setInvalid();
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return;
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}
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if (!isValidFallThroughRange(Binary->virtualAddrToOffset(Target),
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Binary->virtualAddrToOffset(End), Binary)) {
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// Skip unwinding the rest of LBR trace when a bogus range is seen.
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State.setInvalid();
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return;
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}
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if (Binary->usePseudoProbes()) {
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// We don't need to top frame probe since it should be extracted
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// from the range.
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// The outcome of the virtual unwinding with pseudo probes is a
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// map from a context key to the address range being unwound.
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// This means basically linear unwinding is not needed for pseudo
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// probes. The range will be simply recorded here and will be
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// converted to a list of pseudo probes to report in ProfileGenerator.
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State.getParentFrame()->recordRangeCount(Target, End, Repeat);
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} else {
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// Unwind linear execution part.
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// Split and record the range by different inline context. For example:
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// [0x01] ... main:1 # Target
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// [0x02] ... main:2
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// [0x03] ... main:3 @ foo:1
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// [0x04] ... main:3 @ foo:2
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// [0x05] ... main:3 @ foo:3
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// [0x06] ... main:4
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// [0x07] ... main:5 # End
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// It will be recorded:
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// [main:*] : [0x06, 0x07], [0x01, 0x02]
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// [main:3 @ foo:*] : [0x03, 0x05]
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while (IP.Address > Target) {
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uint64_t PrevIP = IP.Address;
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IP.backward();
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// Break into segments for implicit call/return due to inlining
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bool SameInlinee = Binary->inlineContextEqual(PrevIP, IP.Address);
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if (!SameInlinee) {
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State.switchToFrame(PrevIP);
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State.CurrentLeafFrame->recordRangeCount(PrevIP, End, Repeat);
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End = IP.Address;
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}
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}
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assert(IP.Address == Target && "The last one must be the target address.");
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// Record the remaining range, [0x01, 0x02] in the example
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State.switchToFrame(IP.Address);
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State.CurrentLeafFrame->recordRangeCount(IP.Address, End, Repeat);
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}
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}
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void VirtualUnwinder::unwindReturn(UnwindState &State) {
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// Add extra frame as we unwind through the return
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const LBREntry &LBR = State.getCurrentLBR();
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uint64_t CallAddr = Binary->getCallAddrFromFrameAddr(LBR.Target);
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State.switchToFrame(CallAddr);
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State.pushFrame(LBR.Source);
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State.InstPtr.update(LBR.Source);
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}
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void VirtualUnwinder::unwindBranch(UnwindState &State) {
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// TODO: Tolerate tail call for now, as we may see tail call from libraries.
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// This is only for intra function branches, excluding tail calls.
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uint64_t Source = State.getCurrentLBRSource();
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State.switchToFrame(Source);
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State.InstPtr.update(Source);
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}
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std::shared_ptr<StringBasedCtxKey> FrameStack::getContextKey() {
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std::shared_ptr<StringBasedCtxKey> KeyStr =
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std::make_shared<StringBasedCtxKey>();
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KeyStr->Context = Binary->getExpandedContext(Stack, KeyStr->WasLeafInlined);
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return KeyStr;
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}
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std::shared_ptr<AddrBasedCtxKey> AddressStack::getContextKey() {
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std::shared_ptr<AddrBasedCtxKey> KeyStr = std::make_shared<AddrBasedCtxKey>();
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KeyStr->Context = Stack;
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CSProfileGenerator::compressRecursionContext<uint64_t>(KeyStr->Context);
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CSProfileGenerator::trimContext<uint64_t>(KeyStr->Context);
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return KeyStr;
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}
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template <typename T>
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void VirtualUnwinder::collectSamplesFromFrame(UnwindState::ProfiledFrame *Cur,
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T &Stack) {
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if (Cur->RangeSamples.empty() && Cur->BranchSamples.empty())
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return;
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std::shared_ptr<ContextKey> Key = Stack.getContextKey();
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if (Key == nullptr)
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return;
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auto Ret = CtxCounterMap->emplace(Hashable<ContextKey>(Key), SampleCounter());
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SampleCounter &SCounter = Ret.first->second;
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for (auto &Item : Cur->RangeSamples) {
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uint64_t StartOffset = Binary->virtualAddrToOffset(std::get<0>(Item));
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uint64_t EndOffset = Binary->virtualAddrToOffset(std::get<1>(Item));
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SCounter.recordRangeCount(StartOffset, EndOffset, std::get<2>(Item));
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}
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for (auto &Item : Cur->BranchSamples) {
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uint64_t SourceOffset = Binary->virtualAddrToOffset(std::get<0>(Item));
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uint64_t TargetOffset = Binary->virtualAddrToOffset(std::get<1>(Item));
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SCounter.recordBranchCount(SourceOffset, TargetOffset, std::get<2>(Item));
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}
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}
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template <typename T>
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void VirtualUnwinder::collectSamplesFromFrameTrie(
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UnwindState::ProfiledFrame *Cur, T &Stack) {
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if (!Cur->isDummyRoot()) {
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// Truncate the context for external frame since this isn't a real call
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// context the compiler will see.
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if (Cur->isExternalFrame() || !Stack.pushFrame(Cur)) {
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// Process truncated context
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// Start a new traversal ignoring its bottom context
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T EmptyStack(Binary);
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collectSamplesFromFrame(Cur, EmptyStack);
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for (const auto &Item : Cur->Children) {
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collectSamplesFromFrameTrie(Item.second.get(), EmptyStack);
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}
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// Keep note of untracked call site and deduplicate them
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// for warning later.
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if (!Cur->isLeafFrame())
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UntrackedCallsites.insert(Cur->Address);
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return;
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}
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}
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collectSamplesFromFrame(Cur, Stack);
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// Process children frame
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for (const auto &Item : Cur->Children) {
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collectSamplesFromFrameTrie(Item.second.get(), Stack);
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}
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// Recover the call stack
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Stack.popFrame();
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}
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void VirtualUnwinder::collectSamplesFromFrameTrie(
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UnwindState::ProfiledFrame *Cur) {
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if (Binary->usePseudoProbes()) {
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AddressStack Stack(Binary);
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collectSamplesFromFrameTrie<AddressStack>(Cur, Stack);
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} else {
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FrameStack Stack(Binary);
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collectSamplesFromFrameTrie<FrameStack>(Cur, Stack);
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}
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}
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void VirtualUnwinder::recordBranchCount(const LBREntry &Branch,
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UnwindState &State, uint64_t Repeat) {
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if (Branch.Target == ExternalAddr)
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return;
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// Record external-to-internal pattern on the trie root, it later can be
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// used for generating head samples.
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if (Branch.Source == ExternalAddr) {
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State.getDummyRootPtr()->recordBranchCount(Branch.Source, Branch.Target,
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Repeat);
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return;
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}
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if (Binary->usePseudoProbes()) {
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// Same as recordRangeCount, We don't need to top frame probe since we will
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// extract it from branch's source address
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State.getParentFrame()->recordBranchCount(Branch.Source, Branch.Target,
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Repeat);
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} else {
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State.CurrentLeafFrame->recordBranchCount(Branch.Source, Branch.Target,
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Repeat);
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}
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}
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bool VirtualUnwinder::unwind(const PerfSample *Sample, uint64_t Repeat) {
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// Capture initial state as starting point for unwinding.
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UnwindState State(Sample, Binary);
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// Sanity check - making sure leaf of LBR aligns with leaf of stack sample
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// Stack sample sometimes can be unreliable, so filter out bogus ones.
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if (!State.validateInitialState())
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return false;
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NumTotalBranches += State.LBRStack.size();
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// Now process the LBR samples in parrallel with stack sample
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// Note that we do not reverse the LBR entry order so we can
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// unwind the sample stack as we walk through LBR entries.
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while (State.hasNextLBR()) {
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State.checkStateConsistency();
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// Do not attempt linear unwind for the leaf range as it's incomplete.
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if (!State.IsLastLBR()) {
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// Unwind implicit calls/returns from inlining, along the linear path,
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// break into smaller sub section each with its own calling context.
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unwindLinear(State, Repeat);
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}
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// Save the LBR branch before it gets unwound.
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const LBREntry &Branch = State.getCurrentLBR();
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if (isCallState(State)) {
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// Unwind calls - we know we encountered call if LBR overlaps with
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// transition between leaf the 2nd frame. Note that for calls that
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// were not in the original stack sample, we should have added the
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// extra frame when processing the return paired with this call.
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unwindCall(State);
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} else if (isReturnState(State)) {
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// Unwind returns - check whether the IP is indeed at a return
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// instruction
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unwindReturn(State);
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} else if (isValidState(State)) {
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// Unwind branches
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unwindBranch(State);
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} else {
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// Skip unwinding the rest of LBR trace. Reset the stack and update the
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// state so that the rest of the trace can still be processed as if they
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// do not have stack samples.
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State.clearCallStack();
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State.InstPtr.update(State.getCurrentLBRSource());
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State.pushFrame(State.InstPtr.Address);
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}
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State.advanceLBR();
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// Record `branch` with calling context after unwinding.
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recordBranchCount(Branch, State, Repeat);
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}
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// As samples are aggregated on trie, record them into counter map
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collectSamplesFromFrameTrie(State.getDummyRootPtr());
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return true;
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}
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std::unique_ptr<PerfReaderBase>
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PerfReaderBase::create(ProfiledBinary *Binary, PerfInputFile &PerfInput,
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Optional<uint32_t> PIDFilter) {
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std::unique_ptr<PerfReaderBase> PerfReader;
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if (PerfInput.Format == PerfFormat::UnsymbolizedProfile) {
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PerfReader.reset(
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new UnsymbolizedProfileReader(Binary, PerfInput.InputFile));
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return PerfReader;
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}
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// For perf data input, we need to convert them into perf script first.
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if (PerfInput.Format == PerfFormat::PerfData)
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PerfInput =
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PerfScriptReader::convertPerfDataToTrace(Binary, PerfInput, PIDFilter);
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assert((PerfInput.Format == PerfFormat::PerfScript) &&
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"Should be a perfscript!");
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PerfInput.Content =
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PerfScriptReader::checkPerfScriptType(PerfInput.InputFile);
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if (PerfInput.Content == PerfContent::LBRStack) {
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PerfReader.reset(
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new HybridPerfReader(Binary, PerfInput.InputFile, PIDFilter));
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} else if (PerfInput.Content == PerfContent::LBR) {
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PerfReader.reset(new LBRPerfReader(Binary, PerfInput.InputFile, PIDFilter));
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} else {
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exitWithError("Unsupported perfscript!");
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}
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return PerfReader;
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}
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PerfInputFile PerfScriptReader::convertPerfDataToTrace(
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ProfiledBinary *Binary, PerfInputFile &File, Optional<uint32_t> PIDFilter) {
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StringRef PerfData = File.InputFile;
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// Run perf script to retrieve PIDs matching binary we're interested in.
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auto PerfExecutable = sys::Process::FindInEnvPath("PATH", "perf");
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if (!PerfExecutable) {
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exitWithError("Perf not found.");
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}
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std::string PerfPath = *PerfExecutable;
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std::string PerfTraceFile = PerfData.str() + ".script.tmp";
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StringRef ScriptMMapArgs[] = {PerfPath, "script", "--show-mmap-events",
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"-F", "comm,pid", "-i",
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PerfData};
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Optional<StringRef> Redirects[] = {llvm::None, // Stdin
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StringRef(PerfTraceFile), // Stdout
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StringRef(PerfTraceFile)}; // Stderr
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sys::ExecuteAndWait(PerfPath, ScriptMMapArgs, llvm::None, Redirects);
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// Collect the PIDs
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TraceStream TraceIt(PerfTraceFile);
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std::string PIDs;
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std::unordered_set<uint32_t> PIDSet;
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while (!TraceIt.isAtEoF()) {
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MMapEvent MMap;
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if (isMMap2Event(TraceIt.getCurrentLine()) &&
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extractMMap2EventForBinary(Binary, TraceIt.getCurrentLine(), MMap)) {
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auto It = PIDSet.emplace(MMap.PID);
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if (It.second && (!PIDFilter || MMap.PID == *PIDFilter)) {
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if (!PIDs.empty()) {
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PIDs.append(",");
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}
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PIDs.append(utostr(MMap.PID));
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}
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}
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TraceIt.advance();
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}
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if (PIDs.empty()) {
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exitWithError("No relevant mmap event is found in perf data.");
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}
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// Run perf script again to retrieve events for PIDs collected above
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StringRef ScriptSampleArgs[] = {PerfPath, "script", "--show-mmap-events",
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"-F", "ip,brstack", "--pid",
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PIDs, "-i", PerfData};
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sys::ExecuteAndWait(PerfPath, ScriptSampleArgs, llvm::None, Redirects);
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return {PerfTraceFile, PerfFormat::PerfScript, PerfContent::UnknownContent};
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}
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void PerfScriptReader::updateBinaryAddress(const MMapEvent &Event) {
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// Drop the event which doesn't belong to user-provided binary
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StringRef BinaryName = llvm::sys::path::filename(Event.BinaryPath);
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if (Binary->getName() != BinaryName)
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return;
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// Drop the event if process does not match pid filter
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if (PIDFilter && Event.PID != *PIDFilter)
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return;
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// Drop the event if its image is loaded at the same address
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if (Event.Address == Binary->getBaseAddress()) {
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Binary->setIsLoadedByMMap(true);
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return;
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}
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if (Event.Offset == Binary->getTextSegmentOffset()) {
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// A binary image could be unloaded and then reloaded at different
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// place, so update binary load address.
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// Only update for the first executable segment and assume all other
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// segments are loaded at consecutive memory addresses, which is the case on
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// X64.
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Binary->setBaseAddress(Event.Address);
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Binary->setIsLoadedByMMap(true);
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} else {
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// Verify segments are loaded consecutively.
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const auto &Offsets = Binary->getTextSegmentOffsets();
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auto It = std::lower_bound(Offsets.begin(), Offsets.end(), Event.Offset);
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if (It != Offsets.end() && *It == Event.Offset) {
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// The event is for loading a separate executable segment.
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auto I = std::distance(Offsets.begin(), It);
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const auto &PreferredAddrs = Binary->getPreferredTextSegmentAddresses();
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if (PreferredAddrs[I] - Binary->getPreferredBaseAddress() !=
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Event.Address - Binary->getBaseAddress())
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exitWithError("Executable segments not loaded consecutively");
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} else {
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if (It == Offsets.begin())
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exitWithError("File offset not found");
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else {
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// Find the segment the event falls in. A large segment could be loaded
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// via multiple mmap calls with consecutive memory addresses.
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--It;
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assert(*It < Event.Offset);
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if (Event.Offset - *It != Event.Address - Binary->getBaseAddress())
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exitWithError("Segment not loaded by consecutive mmaps");
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}
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}
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}
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}
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static std::string getContextKeyStr(ContextKey *K,
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const ProfiledBinary *Binary) {
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if (const auto *CtxKey = dyn_cast<StringBasedCtxKey>(K)) {
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return SampleContext::getContextString(CtxKey->Context);
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} else if (const auto *CtxKey = dyn_cast<AddrBasedCtxKey>(K)) {
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std::ostringstream OContextStr;
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for (uint32_t I = 0; I < CtxKey->Context.size(); I++) {
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if (OContextStr.str().size())
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OContextStr << " @ ";
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|
OContextStr << "0x"
|
|
<< utohexstr(
|
|
Binary->virtualAddrToOffset(CtxKey->Context[I]),
|
|
/*LowerCase=*/true);
|
|
}
|
|
return OContextStr.str();
|
|
} else {
|
|
llvm_unreachable("unexpected key type");
|
|
}
|
|
}
|
|
|
|
void HybridPerfReader::unwindSamples() {
|
|
if (Binary->useFSDiscriminator())
|
|
exitWithError("FS discriminator is not supported in CS profile.");
|
|
VirtualUnwinder Unwinder(&SampleCounters, Binary);
|
|
for (const auto &Item : AggregatedSamples) {
|
|
const PerfSample *Sample = Item.first.getPtr();
|
|
Unwinder.unwind(Sample, Item.second);
|
|
}
|
|
|
|
// Warn about untracked frames due to missing probes.
|
|
if (ShowDetailedWarning) {
|
|
for (auto Address : Unwinder.getUntrackedCallsites())
|
|
WithColor::warning() << "Profile context truncated due to missing probe "
|
|
<< "for call instruction at "
|
|
<< format("0x%" PRIx64, Address) << "\n";
|
|
}
|
|
|
|
emitWarningSummary(Unwinder.getUntrackedCallsites().size(),
|
|
SampleCounters.size(),
|
|
"of profiled contexts are truncated due to missing probe "
|
|
"for call instruction.");
|
|
|
|
emitWarningSummary(
|
|
Unwinder.NumMismatchedExtCallBranch, Unwinder.NumTotalBranches,
|
|
"of branches'source is a call instruction but doesn't match call frame "
|
|
"stack, likely due to unwinding error of external frame.");
|
|
|
|
emitWarningSummary(Unwinder.NumPairedExtAddr * 2, Unwinder.NumTotalBranches,
|
|
"of branches containing paired external address.");
|
|
|
|
emitWarningSummary(Unwinder.NumUnpairedExtAddr, Unwinder.NumTotalBranches,
|
|
"of branches containing external address but doesn't have "
|
|
"another external address to pair, likely due to "
|
|
"interrupt jmp or broken perf script.");
|
|
|
|
emitWarningSummary(
|
|
Unwinder.NumMismatchedProEpiBranch, Unwinder.NumTotalBranches,
|
|
"of branches'source is a call instruction but doesn't match call frame "
|
|
"stack, likely due to frame in prolog/epilog.");
|
|
|
|
emitWarningSummary(Unwinder.NumMissingExternalFrame,
|
|
Unwinder.NumExtCallBranch,
|
|
"of artificial call branches but doesn't have an external "
|
|
"frame to match.");
|
|
}
|
|
|
|
bool PerfScriptReader::extractLBRStack(TraceStream &TraceIt,
|
|
SmallVectorImpl<LBREntry> &LBRStack) {
|
|
// The raw format of LBR stack is like:
|
|
// 0x4005c8/0x4005dc/P/-/-/0 0x40062f/0x4005b0/P/-/-/0 ...
|
|
// ... 0x4005c8/0x4005dc/P/-/-/0
|
|
// It's in FIFO order and seperated by whitespace.
|
|
SmallVector<StringRef, 32> Records;
|
|
TraceIt.getCurrentLine().split(Records, " ", -1, false);
|
|
auto WarnInvalidLBR = [](TraceStream &TraceIt) {
|
|
WithColor::warning() << "Invalid address in LBR record at line "
|
|
<< TraceIt.getLineNumber() << ": "
|
|
<< TraceIt.getCurrentLine() << "\n";
|
|
};
|
|
|
|
// Skip the leading instruction pointer.
|
|
size_t Index = 0;
|
|
uint64_t LeadingAddr;
|
|
if (!Records.empty() && !Records[0].contains('/')) {
|
|
if (Records[0].getAsInteger(16, LeadingAddr)) {
|
|
WarnInvalidLBR(TraceIt);
|
|
TraceIt.advance();
|
|
return false;
|
|
}
|
|
Index = 1;
|
|
}
|
|
|
|
// Now extract LBR samples - note that we do not reverse the
|
|
// LBR entry order so we can unwind the sample stack as we walk
|
|
// through LBR entries.
|
|
while (Index < Records.size()) {
|
|
auto &Token = Records[Index++];
|
|
if (Token.size() == 0)
|
|
continue;
|
|
|
|
SmallVector<StringRef, 8> Addresses;
|
|
Token.split(Addresses, "/");
|
|
uint64_t Src;
|
|
uint64_t Dst;
|
|
|
|
// Stop at broken LBR records.
|
|
if (Addresses.size() < 2 || Addresses[0].substr(2).getAsInteger(16, Src) ||
|
|
Addresses[1].substr(2).getAsInteger(16, Dst)) {
|
|
WarnInvalidLBR(TraceIt);
|
|
break;
|
|
}
|
|
|
|
bool SrcIsInternal = Binary->addressIsCode(Src);
|
|
bool DstIsInternal = Binary->addressIsCode(Dst);
|
|
if (!SrcIsInternal)
|
|
Src = ExternalAddr;
|
|
if (!DstIsInternal)
|
|
Dst = ExternalAddr;
|
|
// Filter external-to-external case to reduce LBR trace size.
|
|
if (!SrcIsInternal && !DstIsInternal)
|
|
continue;
|
|
|
|
LBRStack.emplace_back(LBREntry(Src, Dst));
|
|
}
|
|
TraceIt.advance();
|
|
return !LBRStack.empty();
|
|
}
|
|
|
|
bool PerfScriptReader::extractCallstack(TraceStream &TraceIt,
|
|
SmallVectorImpl<uint64_t> &CallStack) {
|
|
// The raw format of call stack is like:
|
|
// 4005dc # leaf frame
|
|
// 400634
|
|
// 400684 # root frame
|
|
// It's in bottom-up order with each frame in one line.
|
|
|
|
// Extract stack frames from sample
|
|
while (!TraceIt.isAtEoF() && !TraceIt.getCurrentLine().startswith(" 0x")) {
|
|
StringRef FrameStr = TraceIt.getCurrentLine().ltrim();
|
|
uint64_t FrameAddr = 0;
|
|
if (FrameStr.getAsInteger(16, FrameAddr)) {
|
|
// We might parse a non-perf sample line like empty line and comments,
|
|
// skip it
|
|
TraceIt.advance();
|
|
return false;
|
|
}
|
|
TraceIt.advance();
|
|
// Currently intermixed frame from different binaries is not supported.
|
|
if (!Binary->addressIsCode(FrameAddr)) {
|
|
if (CallStack.empty())
|
|
NumLeafExternalFrame++;
|
|
// Push a special value(ExternalAddr) for the external frames so that
|
|
// unwinder can still work on this with artificial Call/Return branch.
|
|
// After unwinding, the context will be truncated for external frame.
|
|
// Also deduplicate the consecutive external addresses.
|
|
if (CallStack.empty() || CallStack.back() != ExternalAddr)
|
|
CallStack.emplace_back(ExternalAddr);
|
|
continue;
|
|
}
|
|
|
|
// We need to translate return address to call address for non-leaf frames.
|
|
if (!CallStack.empty()) {
|
|
auto CallAddr = Binary->getCallAddrFromFrameAddr(FrameAddr);
|
|
if (!CallAddr) {
|
|
// Stop at an invalid return address caused by bad unwinding. This could
|
|
// happen to frame-pointer-based unwinding and the callee functions that
|
|
// do not have the frame pointer chain set up.
|
|
InvalidReturnAddresses.insert(FrameAddr);
|
|
break;
|
|
}
|
|
FrameAddr = CallAddr;
|
|
}
|
|
|
|
CallStack.emplace_back(FrameAddr);
|
|
}
|
|
|
|
// Strip out the bottom external addr.
|
|
if (CallStack.size() > 1 && CallStack.back() == ExternalAddr)
|
|
CallStack.pop_back();
|
|
|
|
// Skip other unrelated line, find the next valid LBR line
|
|
// Note that even for empty call stack, we should skip the address at the
|
|
// bottom, otherwise the following pass may generate a truncated callstack
|
|
while (!TraceIt.isAtEoF() && !TraceIt.getCurrentLine().startswith(" 0x")) {
|
|
TraceIt.advance();
|
|
}
|
|
// Filter out broken stack sample. We may not have complete frame info
|
|
// if sample end up in prolog/epilog, the result is dangling context not
|
|
// connected to entry point. This should be relatively rare thus not much
|
|
// impact on overall profile quality. However we do want to filter them
|
|
// out to reduce the number of different calling contexts. One instance
|
|
// of such case - when sample landed in prolog/epilog, somehow stack
|
|
// walking will be broken in an unexpected way that higher frames will be
|
|
// missing.
|
|
return !CallStack.empty() &&
|
|
!Binary->addressInPrologEpilog(CallStack.front());
|
|
}
|
|
|
|
void PerfScriptReader::warnIfMissingMMap() {
|
|
if (!Binary->getMissingMMapWarned() && !Binary->getIsLoadedByMMap()) {
|
|
WithColor::warning() << "No relevant mmap event is matched for "
|
|
<< Binary->getName()
|
|
<< ", will use preferred address ("
|
|
<< format("0x%" PRIx64,
|
|
Binary->getPreferredBaseAddress())
|
|
<< ") as the base loading address!\n";
|
|
// Avoid redundant warning, only warn at the first unmatched sample.
|
|
Binary->setMissingMMapWarned(true);
|
|
}
|
|
}
|
|
|
|
void HybridPerfReader::parseSample(TraceStream &TraceIt, uint64_t Count) {
|
|
// The raw hybird sample started with call stack in FILO order and followed
|
|
// intermediately by LBR sample
|
|
// e.g.
|
|
// 4005dc # call stack leaf
|
|
// 400634
|
|
// 400684 # call stack root
|
|
// 0x4005c8/0x4005dc/P/-/-/0 0x40062f/0x4005b0/P/-/-/0 ...
|
|
// ... 0x4005c8/0x4005dc/P/-/-/0 # LBR Entries
|
|
//
|
|
std::shared_ptr<PerfSample> Sample = std::make_shared<PerfSample>();
|
|
#ifndef NDEBUG
|
|
Sample->Linenum = TraceIt.getLineNumber();
|
|
#endif
|
|
// Parsing call stack and populate into PerfSample.CallStack
|
|
if (!extractCallstack(TraceIt, Sample->CallStack)) {
|
|
// Skip the next LBR line matched current call stack
|
|
if (!TraceIt.isAtEoF() && TraceIt.getCurrentLine().startswith(" 0x"))
|
|
TraceIt.advance();
|
|
return;
|
|
}
|
|
|
|
warnIfMissingMMap();
|
|
|
|
if (!TraceIt.isAtEoF() && TraceIt.getCurrentLine().startswith(" 0x")) {
|
|
// Parsing LBR stack and populate into PerfSample.LBRStack
|
|
if (extractLBRStack(TraceIt, Sample->LBRStack)) {
|
|
if (IgnoreStackSamples) {
|
|
Sample->CallStack.clear();
|
|
} else {
|
|
// Canonicalize stack leaf to avoid 'random' IP from leaf frame skew LBR
|
|
// ranges
|
|
Sample->CallStack.front() = Sample->LBRStack[0].Target;
|
|
}
|
|
// Record samples by aggregation
|
|
AggregatedSamples[Hashable<PerfSample>(Sample)] += Count;
|
|
}
|
|
} else {
|
|
// LBR sample is encoded in single line after stack sample
|
|
exitWithError("'Hybrid perf sample is corrupted, No LBR sample line");
|
|
}
|
|
}
|
|
|
|
void PerfScriptReader::writeUnsymbolizedProfile(StringRef Filename) {
|
|
std::error_code EC;
|
|
raw_fd_ostream OS(Filename, EC, llvm::sys::fs::OF_TextWithCRLF);
|
|
if (EC)
|
|
exitWithError(EC, Filename);
|
|
writeUnsymbolizedProfile(OS);
|
|
}
|
|
|
|
// Use ordered map to make the output deterministic
|
|
using OrderedCounterForPrint = std::map<std::string, SampleCounter *>;
|
|
|
|
void PerfScriptReader::writeUnsymbolizedProfile(raw_fd_ostream &OS) {
|
|
OrderedCounterForPrint OrderedCounters;
|
|
for (auto &CI : SampleCounters) {
|
|
OrderedCounters[getContextKeyStr(CI.first.getPtr(), Binary)] = &CI.second;
|
|
}
|
|
|
|
auto SCounterPrinter = [&](RangeSample &Counter, StringRef Separator,
|
|
uint32_t Indent) {
|
|
OS.indent(Indent);
|
|
OS << Counter.size() << "\n";
|
|
for (auto &I : Counter) {
|
|
uint64_t Start = I.first.first;
|
|
uint64_t End = I.first.second;
|
|
|
|
if (!UseOffset || (UseOffset && UseLoadableSegmentAsBase)) {
|
|
Start = Binary->offsetToVirtualAddr(Start);
|
|
End = Binary->offsetToVirtualAddr(End);
|
|
}
|
|
|
|
if (UseOffset && UseLoadableSegmentAsBase) {
|
|
Start -= Binary->getFirstLoadableAddress();
|
|
End -= Binary->getFirstLoadableAddress();
|
|
}
|
|
|
|
OS.indent(Indent);
|
|
OS << Twine::utohexstr(Start) << Separator << Twine::utohexstr(End) << ":"
|
|
<< I.second << "\n";
|
|
}
|
|
};
|
|
|
|
for (auto &CI : OrderedCounters) {
|
|
uint32_t Indent = 0;
|
|
if (ProfileIsCS) {
|
|
// Context string key
|
|
OS << "[" << CI.first << "]\n";
|
|
Indent = 2;
|
|
}
|
|
|
|
SampleCounter &Counter = *CI.second;
|
|
SCounterPrinter(Counter.RangeCounter, "-", Indent);
|
|
SCounterPrinter(Counter.BranchCounter, "->", Indent);
|
|
}
|
|
}
|
|
|
|
// Format of input:
|
|
// number of entries in RangeCounter
|
|
// from_1-to_1:count_1
|
|
// from_2-to_2:count_2
|
|
// ......
|
|
// from_n-to_n:count_n
|
|
// number of entries in BranchCounter
|
|
// src_1->dst_1:count_1
|
|
// src_2->dst_2:count_2
|
|
// ......
|
|
// src_n->dst_n:count_n
|
|
void UnsymbolizedProfileReader::readSampleCounters(TraceStream &TraceIt,
|
|
SampleCounter &SCounters) {
|
|
auto exitWithErrorForTraceLine = [](TraceStream &TraceIt) {
|
|
std::string Msg = TraceIt.isAtEoF()
|
|
? "Invalid raw profile!"
|
|
: "Invalid raw profile at line " +
|
|
Twine(TraceIt.getLineNumber()).str() + ": " +
|
|
TraceIt.getCurrentLine().str();
|
|
exitWithError(Msg);
|
|
};
|
|
auto ReadNumber = [&](uint64_t &Num) {
|
|
if (TraceIt.isAtEoF())
|
|
exitWithErrorForTraceLine(TraceIt);
|
|
if (TraceIt.getCurrentLine().ltrim().getAsInteger(10, Num))
|
|
exitWithErrorForTraceLine(TraceIt);
|
|
TraceIt.advance();
|
|
};
|
|
|
|
auto ReadCounter = [&](RangeSample &Counter, StringRef Separator) {
|
|
uint64_t Num = 0;
|
|
ReadNumber(Num);
|
|
while (Num--) {
|
|
if (TraceIt.isAtEoF())
|
|
exitWithErrorForTraceLine(TraceIt);
|
|
StringRef Line = TraceIt.getCurrentLine().ltrim();
|
|
|
|
uint64_t Count = 0;
|
|
auto LineSplit = Line.split(":");
|
|
if (LineSplit.second.empty() || LineSplit.second.getAsInteger(10, Count))
|
|
exitWithErrorForTraceLine(TraceIt);
|
|
|
|
uint64_t Source = 0;
|
|
uint64_t Target = 0;
|
|
auto Range = LineSplit.first.split(Separator);
|
|
if (Range.second.empty() || Range.first.getAsInteger(16, Source) ||
|
|
Range.second.getAsInteger(16, Target))
|
|
exitWithErrorForTraceLine(TraceIt);
|
|
|
|
if (!UseOffset || (UseOffset && UseLoadableSegmentAsBase)) {
|
|
uint64_t BaseAddr = 0;
|
|
if (UseOffset && UseLoadableSegmentAsBase)
|
|
BaseAddr = Binary->getFirstLoadableAddress();
|
|
|
|
Source = Binary->virtualAddrToOffset(Source + BaseAddr);
|
|
Target = Binary->virtualAddrToOffset(Target + BaseAddr);
|
|
}
|
|
|
|
Counter[{Source, Target}] += Count;
|
|
TraceIt.advance();
|
|
}
|
|
};
|
|
|
|
ReadCounter(SCounters.RangeCounter, "-");
|
|
ReadCounter(SCounters.BranchCounter, "->");
|
|
}
|
|
|
|
void UnsymbolizedProfileReader::readUnsymbolizedProfile(StringRef FileName) {
|
|
TraceStream TraceIt(FileName);
|
|
while (!TraceIt.isAtEoF()) {
|
|
std::shared_ptr<StringBasedCtxKey> Key =
|
|
std::make_shared<StringBasedCtxKey>();
|
|
StringRef Line = TraceIt.getCurrentLine();
|
|
// Read context stack for CS profile.
|
|
if (Line.startswith("[")) {
|
|
ProfileIsCS = true;
|
|
auto I = ContextStrSet.insert(Line.str());
|
|
SampleContext::createCtxVectorFromStr(*I.first, Key->Context);
|
|
TraceIt.advance();
|
|
}
|
|
auto Ret =
|
|
SampleCounters.emplace(Hashable<ContextKey>(Key), SampleCounter());
|
|
readSampleCounters(TraceIt, Ret.first->second);
|
|
}
|
|
}
|
|
|
|
void UnsymbolizedProfileReader::parsePerfTraces() {
|
|
readUnsymbolizedProfile(PerfTraceFile);
|
|
}
|
|
|
|
void PerfScriptReader::computeCounterFromLBR(const PerfSample *Sample,
|
|
uint64_t Repeat) {
|
|
SampleCounter &Counter = SampleCounters.begin()->second;
|
|
uint64_t EndOffeset = 0;
|
|
for (const LBREntry &LBR : Sample->LBRStack) {
|
|
uint64_t SourceOffset = Binary->virtualAddrToOffset(LBR.Source);
|
|
uint64_t TargetOffset = Binary->virtualAddrToOffset(LBR.Target);
|
|
|
|
// Record the branch if its sourceOffset is external. It can be the case an
|
|
// external source call an internal function, later this branch will be used
|
|
// to generate the function's head sample.
|
|
if (Binary->offsetIsCode(TargetOffset)) {
|
|
Counter.recordBranchCount(SourceOffset, TargetOffset, Repeat);
|
|
}
|
|
|
|
// If this not the first LBR, update the range count between TO of current
|
|
// LBR and FROM of next LBR.
|
|
uint64_t StartOffset = TargetOffset;
|
|
if (Binary->offsetIsCode(StartOffset) && Binary->offsetIsCode(EndOffeset) &&
|
|
isValidFallThroughRange(StartOffset, EndOffeset, Binary))
|
|
Counter.recordRangeCount(StartOffset, EndOffeset, Repeat);
|
|
EndOffeset = SourceOffset;
|
|
}
|
|
}
|
|
|
|
void LBRPerfReader::parseSample(TraceStream &TraceIt, uint64_t Count) {
|
|
std::shared_ptr<PerfSample> Sample = std::make_shared<PerfSample>();
|
|
// Parsing LBR stack and populate into PerfSample.LBRStack
|
|
if (extractLBRStack(TraceIt, Sample->LBRStack)) {
|
|
warnIfMissingMMap();
|
|
// Record LBR only samples by aggregation
|
|
AggregatedSamples[Hashable<PerfSample>(Sample)] += Count;
|
|
}
|
|
}
|
|
|
|
void PerfScriptReader::generateUnsymbolizedProfile() {
|
|
// There is no context for LBR only sample, so initialize one entry with
|
|
// fake "empty" context key.
|
|
assert(SampleCounters.empty() &&
|
|
"Sample counter map should be empty before raw profile generation");
|
|
std::shared_ptr<StringBasedCtxKey> Key =
|
|
std::make_shared<StringBasedCtxKey>();
|
|
SampleCounters.emplace(Hashable<ContextKey>(Key), SampleCounter());
|
|
for (const auto &Item : AggregatedSamples) {
|
|
const PerfSample *Sample = Item.first.getPtr();
|
|
computeCounterFromLBR(Sample, Item.second);
|
|
}
|
|
}
|
|
|
|
uint64_t PerfScriptReader::parseAggregatedCount(TraceStream &TraceIt) {
|
|
// The aggregated count is optional, so do not skip the line and return 1 if
|
|
// it's unmatched
|
|
uint64_t Count = 1;
|
|
if (!TraceIt.getCurrentLine().getAsInteger(10, Count))
|
|
TraceIt.advance();
|
|
return Count;
|
|
}
|
|
|
|
void PerfScriptReader::parseSample(TraceStream &TraceIt) {
|
|
NumTotalSample++;
|
|
uint64_t Count = parseAggregatedCount(TraceIt);
|
|
assert(Count >= 1 && "Aggregated count should be >= 1!");
|
|
parseSample(TraceIt, Count);
|
|
}
|
|
|
|
bool PerfScriptReader::extractMMap2EventForBinary(ProfiledBinary *Binary,
|
|
StringRef Line,
|
|
MMapEvent &MMap) {
|
|
// Parse a line like:
|
|
// PERF_RECORD_MMAP2 2113428/2113428: [0x7fd4efb57000(0x204000) @ 0
|
|
// 08:04 19532229 3585508847]: r-xp /usr/lib64/libdl-2.17.so
|
|
constexpr static const char *const Pattern =
|
|
"PERF_RECORD_MMAP2 ([0-9]+)/[0-9]+: "
|
|
"\\[(0x[a-f0-9]+)\\((0x[a-f0-9]+)\\) @ "
|
|
"(0x[a-f0-9]+|0) .*\\]: [-a-z]+ (.*)";
|
|
// Field 0 - whole line
|
|
// Field 1 - PID
|
|
// Field 2 - base address
|
|
// Field 3 - mmapped size
|
|
// Field 4 - page offset
|
|
// Field 5 - binary path
|
|
enum EventIndex {
|
|
WHOLE_LINE = 0,
|
|
PID = 1,
|
|
MMAPPED_ADDRESS = 2,
|
|
MMAPPED_SIZE = 3,
|
|
PAGE_OFFSET = 4,
|
|
BINARY_PATH = 5
|
|
};
|
|
|
|
Regex RegMmap2(Pattern);
|
|
SmallVector<StringRef, 6> Fields;
|
|
bool R = RegMmap2.match(Line, &Fields);
|
|
if (!R) {
|
|
std::string ErrorMsg = "Cannot parse mmap event: " + Line.str() + " \n";
|
|
exitWithError(ErrorMsg);
|
|
}
|
|
Fields[PID].getAsInteger(10, MMap.PID);
|
|
Fields[MMAPPED_ADDRESS].getAsInteger(0, MMap.Address);
|
|
Fields[MMAPPED_SIZE].getAsInteger(0, MMap.Size);
|
|
Fields[PAGE_OFFSET].getAsInteger(0, MMap.Offset);
|
|
MMap.BinaryPath = Fields[BINARY_PATH];
|
|
if (ShowMmapEvents) {
|
|
outs() << "Mmap: Binary " << MMap.BinaryPath << " loaded at "
|
|
<< format("0x%" PRIx64 ":", MMap.Address) << " \n";
|
|
}
|
|
|
|
StringRef BinaryName = llvm::sys::path::filename(MMap.BinaryPath);
|
|
return Binary->getName() == BinaryName;
|
|
}
|
|
|
|
void PerfScriptReader::parseMMap2Event(TraceStream &TraceIt) {
|
|
MMapEvent MMap;
|
|
if (extractMMap2EventForBinary(Binary, TraceIt.getCurrentLine(), MMap))
|
|
updateBinaryAddress(MMap);
|
|
TraceIt.advance();
|
|
}
|
|
|
|
void PerfScriptReader::parseEventOrSample(TraceStream &TraceIt) {
|
|
if (isMMap2Event(TraceIt.getCurrentLine()))
|
|
parseMMap2Event(TraceIt);
|
|
else
|
|
parseSample(TraceIt);
|
|
}
|
|
|
|
void PerfScriptReader::parseAndAggregateTrace() {
|
|
// Trace line iterator
|
|
TraceStream TraceIt(PerfTraceFile);
|
|
while (!TraceIt.isAtEoF())
|
|
parseEventOrSample(TraceIt);
|
|
}
|
|
|
|
// A LBR sample is like:
|
|
// 40062f 0x5c6313f/0x5c63170/P/-/-/0 0x5c630e7/0x5c63130/P/-/-/0 ...
|
|
// A heuristic for fast detection by checking whether a
|
|
// leading " 0x" and the '/' exist.
|
|
bool PerfScriptReader::isLBRSample(StringRef Line) {
|
|
// Skip the leading instruction pointer
|
|
SmallVector<StringRef, 32> Records;
|
|
Line.trim().split(Records, " ", 2, false);
|
|
if (Records.size() < 2)
|
|
return false;
|
|
if (Records[1].startswith("0x") && Records[1].contains('/'))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
bool PerfScriptReader::isMMap2Event(StringRef Line) {
|
|
// Short cut to avoid string find is possible.
|
|
if (Line.empty() || Line.size() < 50)
|
|
return false;
|
|
|
|
if (std::isdigit(Line[0]))
|
|
return false;
|
|
|
|
// PERF_RECORD_MMAP2 does not appear at the beginning of the line
|
|
// for ` perf script --show-mmap-events -i ...`
|
|
return Line.contains("PERF_RECORD_MMAP2");
|
|
}
|
|
|
|
// The raw hybird sample is like
|
|
// e.g.
|
|
// 4005dc # call stack leaf
|
|
// 400634
|
|
// 400684 # call stack root
|
|
// 0x4005c8/0x4005dc/P/-/-/0 0x40062f/0x4005b0/P/-/-/0 ...
|
|
// ... 0x4005c8/0x4005dc/P/-/-/0 # LBR Entries
|
|
// Determine the perfscript contains hybrid samples(call stack + LBRs) by
|
|
// checking whether there is a non-empty call stack immediately followed by
|
|
// a LBR sample
|
|
PerfContent PerfScriptReader::checkPerfScriptType(StringRef FileName) {
|
|
TraceStream TraceIt(FileName);
|
|
uint64_t FrameAddr = 0;
|
|
while (!TraceIt.isAtEoF()) {
|
|
// Skip the aggregated count
|
|
if (!TraceIt.getCurrentLine().getAsInteger(10, FrameAddr))
|
|
TraceIt.advance();
|
|
|
|
// Detect sample with call stack
|
|
int32_t Count = 0;
|
|
while (!TraceIt.isAtEoF() &&
|
|
!TraceIt.getCurrentLine().ltrim().getAsInteger(16, FrameAddr)) {
|
|
Count++;
|
|
TraceIt.advance();
|
|
}
|
|
if (!TraceIt.isAtEoF()) {
|
|
if (isLBRSample(TraceIt.getCurrentLine())) {
|
|
if (Count > 0)
|
|
return PerfContent::LBRStack;
|
|
else
|
|
return PerfContent::LBR;
|
|
}
|
|
TraceIt.advance();
|
|
}
|
|
}
|
|
|
|
exitWithError("Invalid perf script input!");
|
|
return PerfContent::UnknownContent;
|
|
}
|
|
|
|
void HybridPerfReader::generateUnsymbolizedProfile() {
|
|
ProfileIsCS = !IgnoreStackSamples;
|
|
if (ProfileIsCS)
|
|
unwindSamples();
|
|
else
|
|
PerfScriptReader::generateUnsymbolizedProfile();
|
|
}
|
|
|
|
void PerfScriptReader::warnTruncatedStack() {
|
|
if (ShowDetailedWarning) {
|
|
for (auto Address : InvalidReturnAddresses) {
|
|
WithColor::warning()
|
|
<< "Truncated stack sample due to invalid return address at "
|
|
<< format("0x%" PRIx64, Address)
|
|
<< ", likely caused by frame pointer omission\n";
|
|
}
|
|
}
|
|
emitWarningSummary(
|
|
InvalidReturnAddresses.size(), AggregatedSamples.size(),
|
|
"of truncated stack samples due to invalid return address, "
|
|
"likely caused by frame pointer omission.");
|
|
}
|
|
|
|
void PerfScriptReader::warnInvalidRange() {
|
|
std::unordered_map<std::pair<uint64_t, uint64_t>, uint64_t,
|
|
pair_hash<uint64_t, uint64_t>>
|
|
Ranges;
|
|
|
|
for (const auto &Item : AggregatedSamples) {
|
|
const PerfSample *Sample = Item.first.getPtr();
|
|
uint64_t Count = Item.second;
|
|
uint64_t EndOffeset = 0;
|
|
for (const LBREntry &LBR : Sample->LBRStack) {
|
|
uint64_t SourceOffset = Binary->virtualAddrToOffset(LBR.Source);
|
|
uint64_t StartOffset = Binary->virtualAddrToOffset(LBR.Target);
|
|
if (EndOffeset != 0)
|
|
Ranges[{StartOffset, EndOffeset}] += Count;
|
|
EndOffeset = SourceOffset;
|
|
}
|
|
}
|
|
|
|
if (Ranges.empty()) {
|
|
WithColor::warning() << "No samples in perf script!\n";
|
|
return;
|
|
}
|
|
|
|
auto WarnInvalidRange =
|
|
[&](uint64_t StartOffset, uint64_t EndOffset, StringRef Msg) {
|
|
if (!ShowDetailedWarning)
|
|
return;
|
|
WithColor::warning()
|
|
<< "["
|
|
<< format("%8" PRIx64, Binary->offsetToVirtualAddr(StartOffset))
|
|
<< ","
|
|
<< format("%8" PRIx64, Binary->offsetToVirtualAddr(EndOffset))
|
|
<< "]: " << Msg << "\n";
|
|
};
|
|
|
|
const char *EndNotBoundaryMsg = "Range is not on instruction boundary, "
|
|
"likely due to profile and binary mismatch.";
|
|
const char *DanglingRangeMsg = "Range does not belong to any functions, "
|
|
"likely from PLT, .init or .fini section.";
|
|
const char *RangeCrossFuncMsg =
|
|
"Fall through range should not cross function boundaries, likely due to "
|
|
"profile and binary mismatch.";
|
|
const char *BogusRangeMsg = "Range start is after or too far from range end.";
|
|
|
|
uint64_t TotalRangeNum = 0;
|
|
uint64_t InstNotBoundary = 0;
|
|
uint64_t UnmatchedRange = 0;
|
|
uint64_t RangeCrossFunc = 0;
|
|
uint64_t BogusRange = 0;
|
|
|
|
for (auto &I : Ranges) {
|
|
uint64_t StartOffset = I.first.first;
|
|
uint64_t EndOffset = I.first.second;
|
|
TotalRangeNum += I.second;
|
|
|
|
if (!Binary->offsetIsCode(StartOffset) ||
|
|
!Binary->offsetIsTransfer(EndOffset)) {
|
|
InstNotBoundary += I.second;
|
|
WarnInvalidRange(StartOffset, EndOffset, EndNotBoundaryMsg);
|
|
}
|
|
|
|
auto *FRange = Binary->findFuncRangeForOffset(StartOffset);
|
|
if (!FRange) {
|
|
UnmatchedRange += I.second;
|
|
WarnInvalidRange(StartOffset, EndOffset, DanglingRangeMsg);
|
|
continue;
|
|
}
|
|
|
|
if (EndOffset >= FRange->EndOffset) {
|
|
RangeCrossFunc += I.second;
|
|
WarnInvalidRange(StartOffset, EndOffset, RangeCrossFuncMsg);
|
|
}
|
|
|
|
if (!isValidFallThroughRange(StartOffset, EndOffset, Binary)) {
|
|
BogusRange += I.second;
|
|
WarnInvalidRange(StartOffset, EndOffset, BogusRangeMsg);
|
|
}
|
|
}
|
|
|
|
emitWarningSummary(
|
|
InstNotBoundary, TotalRangeNum,
|
|
"of samples are from ranges that are not on instruction boundary.");
|
|
emitWarningSummary(
|
|
UnmatchedRange, TotalRangeNum,
|
|
"of samples are from ranges that do not belong to any functions.");
|
|
emitWarningSummary(
|
|
RangeCrossFunc, TotalRangeNum,
|
|
"of samples are from ranges that do cross function boundaries.");
|
|
emitWarningSummary(
|
|
BogusRange, TotalRangeNum,
|
|
"of samples are from ranges that have range start after or too far from "
|
|
"range end acrossing the unconditinal jmp.");
|
|
}
|
|
|
|
void PerfScriptReader::parsePerfTraces() {
|
|
// Parse perf traces and do aggregation.
|
|
parseAndAggregateTrace();
|
|
|
|
emitWarningSummary(NumLeafExternalFrame, NumTotalSample,
|
|
"of samples have leaf external frame in call stack.");
|
|
emitWarningSummary(NumLeadingOutgoingLBR, NumTotalSample,
|
|
"of samples have leading external LBR.");
|
|
|
|
// Generate unsymbolized profile.
|
|
warnTruncatedStack();
|
|
warnInvalidRange();
|
|
generateUnsymbolizedProfile();
|
|
AggregatedSamples.clear();
|
|
|
|
if (SkipSymbolization)
|
|
writeUnsymbolizedProfile(OutputFilename);
|
|
}
|
|
|
|
} // end namespace sampleprof
|
|
} // end namespace llvm
|