Trace.cpp revision bdff548e4dd577a72094d57b282de4e765643b96 
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/Function.h"
20#include "llvm/Assembly/Writer.h"
21#include "llvm/Support/raw_ostream.h"
22using namespace llvm;
23
24Function *Trace::getFunction() const {
25  return getEntryBasicBlock()->getParent();
26}
27
28Module *Trace::getModule() const {
29  return getFunction()->getParent();
30}
31
32/// print - Write trace to output stream.
33///
34void Trace::print(raw_ostream &O) const {
35  Function *F = getFunction();
36  O << "; Trace from function " << F->getNameStr() << ", blocks:\n";
37  for (const_iterator i = begin(), e = end(); i != e; ++i) {
38    O << "; ";
39    WriteAsOperand(O, *i, true, getModule());
40    O << "\n";
41  }
42  O << "; Trace parent function: \n" << *F;
43}
44
45/// dump - Debugger convenience method; writes trace to standard error
46/// output stream.
47///
48void Trace::dump() const {
49  print(errs());
50}
51