1e8d8bef9SDimitry Andric //===- llvm/CodeGen/PseudoProbePrinter.cpp - Pseudo Probe Emission -------===// 2e8d8bef9SDimitry Andric // 3e8d8bef9SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4e8d8bef9SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5e8d8bef9SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6e8d8bef9SDimitry Andric // 7e8d8bef9SDimitry Andric //===----------------------------------------------------------------------===// 8e8d8bef9SDimitry Andric // 9e8d8bef9SDimitry Andric // This file contains support for writing pseudo probe info into asm files. 10e8d8bef9SDimitry Andric // 11e8d8bef9SDimitry Andric //===----------------------------------------------------------------------===// 12e8d8bef9SDimitry Andric 13e8d8bef9SDimitry Andric #include "PseudoProbePrinter.h" 14e8d8bef9SDimitry Andric #include "llvm/CodeGen/AsmPrinter.h" 15e8d8bef9SDimitry Andric #include "llvm/IR/DebugInfoMetadata.h" 16e8d8bef9SDimitry Andric #include "llvm/IR/Module.h" 17e8d8bef9SDimitry Andric #include "llvm/IR/PseudoProbe.h" 18e8d8bef9SDimitry Andric #include "llvm/MC/MCPseudoProbe.h" 19e8d8bef9SDimitry Andric #include "llvm/MC/MCStreamer.h" 20e8d8bef9SDimitry Andric 21e8d8bef9SDimitry Andric using namespace llvm; 22e8d8bef9SDimitry Andric 23*349cc55cSDimitry Andric PseudoProbeHandler::~PseudoProbeHandler() = default; 24*349cc55cSDimitry Andric 25e8d8bef9SDimitry Andric void PseudoProbeHandler::emitPseudoProbe(uint64_t Guid, uint64_t Index, 26e8d8bef9SDimitry Andric uint64_t Type, uint64_t Attr, 27e8d8bef9SDimitry Andric const DILocation *DebugLoc) { 28e8d8bef9SDimitry Andric // Gather all the inlined-at nodes. 29e8d8bef9SDimitry Andric // When it's done ReversedInlineStack looks like ([66, B], [88, A]) 30e8d8bef9SDimitry Andric // which means, Function A inlines function B at calliste with a probe id 88, 31e8d8bef9SDimitry Andric // and B inlines C at probe 66 where C is represented by Guid. 32e8d8bef9SDimitry Andric SmallVector<InlineSite, 8> ReversedInlineStack; 33e8d8bef9SDimitry Andric auto *InlinedAt = DebugLoc ? DebugLoc->getInlinedAt() : nullptr; 34e8d8bef9SDimitry Andric while (InlinedAt) { 35e8d8bef9SDimitry Andric const DISubprogram *SP = InlinedAt->getScope()->getSubprogram(); 36e8d8bef9SDimitry Andric // Use linkage name for C++ if possible. 37e8d8bef9SDimitry Andric auto Name = SP->getLinkageName(); 38e8d8bef9SDimitry Andric if (Name.empty()) 39e8d8bef9SDimitry Andric Name = SP->getName(); 40*349cc55cSDimitry Andric // Use caching to avoid redundant md5 computation for build speed. 41*349cc55cSDimitry Andric uint64_t &CallerGuid = NameGuidMap[Name]; 42*349cc55cSDimitry Andric if (!CallerGuid) 43*349cc55cSDimitry Andric CallerGuid = Function::getGUID(Name); 44e8d8bef9SDimitry Andric uint64_t CallerProbeId = PseudoProbeDwarfDiscriminator::extractProbeIndex( 45e8d8bef9SDimitry Andric InlinedAt->getDiscriminator()); 46e8d8bef9SDimitry Andric ReversedInlineStack.emplace_back(CallerGuid, CallerProbeId); 47e8d8bef9SDimitry Andric InlinedAt = InlinedAt->getInlinedAt(); 48e8d8bef9SDimitry Andric } 49e8d8bef9SDimitry Andric 50e8d8bef9SDimitry Andric SmallVector<InlineSite, 8> InlineStack(ReversedInlineStack.rbegin(), 51e8d8bef9SDimitry Andric ReversedInlineStack.rend()); 52e8d8bef9SDimitry Andric Asm->OutStreamer->emitPseudoProbe(Guid, Index, Type, Attr, InlineStack); 53e8d8bef9SDimitry Andric } 54