lib/Analysis/Trace.cpp

   1 //===- Trace.cpp - Implementation of Trace class --------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file was developed by the LLVM research group and is distributed under
   6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This class represents a single trace of LLVM basic blocks.  A trace is a
  11 // single entry, multiple exit, region of code that is often hot.  Trace-based
  12 // optimizations treat traces almost like they are a large, strange, basic
  13 // block: because the trace path is assumed to be hot, optimizations for the
  14 // fall-through path are made at the expense of the non-fall-through paths.
  15 //
  16 //===----------------------------------------------------------------------===//
  17
  18 #include "llvm/Analysis/Trace.h"
  19 #include "llvm/Function.h"
  20 #include "llvm/Assembly/Writer.h"
  21 #include <iostream>
  22
  23 using namespace llvm;
  24
  25 Function *Trace::getFunction() const {
  26   return getEntryBasicBlock()->getParent();
  27 }
  28
  29
  30 Module *Trace::getModule() const {
  31   return getFunction()->getParent();
  32 }
  33
  34 /// print - Write trace to output stream.
  35 ///
  36 void Trace::print (std::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     WriteAsOperand (O, *i, true, true, getModule ());
  42     O << "\n";
  43   }
  44   O << "; Trace parent function: \n" << *F;
  45 }
  46
  47 /// dump - Debugger convenience method; writes trace to standard error
  48 /// output stream.
  49 ///
  50 void Trace::dump () const {
  51   print (std::cerr);
  52 }