Trace.cpp revision 0b8c9a80f20772c3793201ab5b251d3520b9cea3 
1//===- Trace.cpp - Implementation of Trace class --------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// 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/Assembly/Writer.h"
20#include "llvm/IR/Function.h"
21#include "llvm/Support/Debug.h"
22#include "llvm/Support/raw_ostream.h"
23using namespace llvm;
24
25Function *Trace::getFunction() const {
26  return getEntryBasicBlock()->getParent();
27}
28
29Module *Trace::getModule() const {
30  return getFunction()->getParent();
31}
32
33/// print - Write trace to output stream.
34///
35void Trace::print(raw_ostream &O) const {
36  Function *F = getFunction();
37  O << "; Trace from function " << F->getName() << ", blocks:\n";
38  for (const_iterator i = begin(), e = end(); i != e; ++i) {
39    O << "; ";
40    WriteAsOperand(O, *i, true, getModule());
41    O << "\n";
42  }
43  O << "; Trace parent function: \n" << *F;
44}
45
46#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
47/// dump - Debugger convenience method; writes trace to standard error
48/// output stream.
49///
50void Trace::dump() const {
51  print(dbgs());
52}
53#endif
54