mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-12-29 15:04:57 +00:00
120 lines
4.1 KiB
C++
120 lines
4.1 KiB
C++
//===- llvm/Analysis/Trace.h - Represent one trace of LLVM code -*- C++ -*-===//
|
|
//
|
|
// 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.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_ANALYSIS_TRACE_H
|
|
#define LLVM_ANALYSIS_TRACE_H
|
|
|
|
#include <vector>
|
|
#include <cassert>
|
|
|
|
namespace llvm {
|
|
class BasicBlock;
|
|
class Function;
|
|
class Module;
|
|
class raw_ostream;
|
|
|
|
class Trace {
|
|
typedef std::vector<BasicBlock *> BasicBlockListType;
|
|
BasicBlockListType BasicBlocks;
|
|
|
|
public:
|
|
/// Trace ctor - Make a new trace from a vector of basic blocks,
|
|
/// residing in the function which is the parent of the first
|
|
/// basic block in the vector.
|
|
///
|
|
Trace(const std::vector<BasicBlock *> &vBB) : BasicBlocks (vBB) {}
|
|
|
|
/// getEntryBasicBlock - Return the entry basic block (first block)
|
|
/// of the trace.
|
|
///
|
|
BasicBlock *getEntryBasicBlock () const { return BasicBlocks[0]; }
|
|
|
|
/// operator[]/getBlock - Return basic block N in the trace.
|
|
///
|
|
BasicBlock *operator[](unsigned i) const { return BasicBlocks[i]; }
|
|
BasicBlock *getBlock(unsigned i) const { return BasicBlocks[i]; }
|
|
|
|
/// getFunction - Return this trace's parent function.
|
|
///
|
|
Function *getFunction () const;
|
|
|
|
/// getModule - Return this Module that contains this trace's parent
|
|
/// function.
|
|
///
|
|
Module *getModule () const;
|
|
|
|
/// getBlockIndex - Return the index of the specified basic block in the
|
|
/// trace, or -1 if it is not in the trace.
|
|
int getBlockIndex(const BasicBlock *X) const {
|
|
for (unsigned i = 0, e = BasicBlocks.size(); i != e; ++i)
|
|
if (BasicBlocks[i] == X)
|
|
return i;
|
|
return -1;
|
|
}
|
|
|
|
/// contains - Returns true if this trace contains the given basic
|
|
/// block.
|
|
///
|
|
bool contains(const BasicBlock *X) const {
|
|
return getBlockIndex(X) != -1;
|
|
}
|
|
|
|
/// Returns true if B1 occurs before B2 in the trace, or if it is the same
|
|
/// block as B2.. Both blocks must be in the trace.
|
|
///
|
|
bool dominates(const BasicBlock *B1, const BasicBlock *B2) const {
|
|
int B1Idx = getBlockIndex(B1), B2Idx = getBlockIndex(B2);
|
|
assert(B1Idx != -1 && B2Idx != -1 && "Block is not in the trace!");
|
|
return B1Idx <= B2Idx;
|
|
}
|
|
|
|
// BasicBlock iterators...
|
|
typedef BasicBlockListType::iterator iterator;
|
|
typedef BasicBlockListType::const_iterator const_iterator;
|
|
typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
|
|
typedef std::reverse_iterator<iterator> reverse_iterator;
|
|
|
|
iterator begin() { return BasicBlocks.begin(); }
|
|
const_iterator begin() const { return BasicBlocks.begin(); }
|
|
iterator end () { return BasicBlocks.end(); }
|
|
const_iterator end () const { return BasicBlocks.end(); }
|
|
|
|
reverse_iterator rbegin() { return BasicBlocks.rbegin(); }
|
|
const_reverse_iterator rbegin() const { return BasicBlocks.rbegin(); }
|
|
reverse_iterator rend () { return BasicBlocks.rend(); }
|
|
const_reverse_iterator rend () const { return BasicBlocks.rend(); }
|
|
|
|
unsigned size() const { return BasicBlocks.size(); }
|
|
bool empty() const { return BasicBlocks.empty(); }
|
|
|
|
iterator erase(iterator q) { return BasicBlocks.erase (q); }
|
|
iterator erase(iterator q1, iterator q2) { return BasicBlocks.erase (q1, q2); }
|
|
|
|
/// print - Write trace to output stream.
|
|
///
|
|
void print(raw_ostream &O) const;
|
|
|
|
/// dump - Debugger convenience method; writes trace to standard error
|
|
/// output stream.
|
|
///
|
|
void dump() const;
|
|
};
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif // TRACE_H
|