1 //===- Trace.cpp - Implementation of Trace class --------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This class represents a single trace of LLVM basic blocks. A trace is a 10 // single entry, multiple exit, region of code that is often hot. Trace-based 11 // optimizations treat traces almost like they are a large, strange, basic 12 // block: because the trace path is assumed to be hot, optimizations for the 13 // fall-through path are made at the expense of the non-fall-through paths. 14 // 15 //===----------------------------------------------------------------------===// 16 17 #include "llvm/Analysis/Trace.h" 18 #include "llvm/Config/llvm-config.h" 19 #include "llvm/IR/BasicBlock.h" 20 #include "llvm/IR/Function.h" 21 #include "llvm/Support/Compiler.h" 22 #include "llvm/Support/Debug.h" 23 #include "llvm/Support/raw_ostream.h" 24 25 using namespace llvm; 26 27 Function *Trace::getFunction() const { 28 return getEntryBasicBlock()->getParent(); 29 } 30 31 Module *Trace::getModule() const { 32 return getFunction()->getParent(); 33 } 34 35 /// print - Write trace to output stream. 36 void Trace::print(raw_ostream &O) const { 37 Function *F = getFunction(); 38 O << "; Trace from function " << F->getName() << ", blocks:\n"; 39 for (const_iterator i = begin(), e = end(); i != e; ++i) { 40 O << "; "; 41 (*i)->printAsOperand(O, true, getModule()); 42 O << "\n"; 43 } 44 O << "; Trace parent function: \n" << *F; 45 } 46 47 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) 48 /// dump - Debugger convenience method; writes trace to standard error 49 /// output stream. 50 LLVM_DUMP_METHOD void Trace::dump() const { 51 print(dbgs()); 52 } 53 #endif 54