Check in LLVM r95781.

1 files changed, 51 insertions, 0 deletions

diff --git a/lib/Analysis/Trace.cpp b/lib/Analysis/Trace.cpp
new file mode 100644
index 0000000000..68a39cd581
--- /dev/null
+++ b/lib/Analysis/Trace.cpp
@@ -0,0 +1,51 @@
+//===- Trace.cpp - Implementation of Trace class --------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This class represents a single trace of LLVM basic blocks.  A trace is a
+// single entry, multiple exit, region of code that is often hot.  Trace-based
+// optimizations treat traces almost like they are a large, strange, basic
+// block: because the trace path is assumed to be hot, optimizations for the
+// fall-through path are made at the expense of the non-fall-through paths.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/Trace.h"
+#include "llvm/Function.h"
+#include "llvm/Assembly/Writer.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+
+Function *Trace::getFunction() const {
+  return getEntryBasicBlock()->getParent();
+}
+
+Module *Trace::getModule() const {
+  return getFunction()->getParent();
+}
+
+/// print - Write trace to output stream.
+///
+void Trace::print(raw_ostream &O) const {
+  Function *F = getFunction();
+  O << "; Trace from function " << F->getNameStr() << ", blocks:\n";
+  for (const_iterator i = begin(), e = end(); i != e; ++i) {
+    O << "; ";
+    WriteAsOperand(O, *i, true, getModule());
+    O << "\n";
+  }
+  O << "; Trace parent function: \n" << *F;
+}
+
+/// dump - Debugger convenience method; writes trace to standard error
+/// output stream.
+///
+void Trace::dump() const {
+  print(dbgs());
+}