Trace.cpp revision 6f81b510217bd87f265cca054c5d9885250d8525 
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 "llvm/Support/Streams.h"
22using namespace llvm;
23
24Function *Trace::getFunction() const {
25  return getEntryBasicBlock()->getParent();
26}
27
28
29Module *Trace::getModule() const {
30  return getFunction()->getParent();
31}
32
33/// print - Write trace to output stream.
34///
35void Trace::print(llvm_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    if (O.stream())
41      WriteAsOperand(*O.stream(), *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///
50void Trace::dump() const {
51  print(llvm_cerr);
52}
53