mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-05 13:09:10 +00:00
25ad1cc32a
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144647 91177308-0d34-0410-b5e6-96231b3b80d8
98 lines
3.1 KiB
C++
98 lines
3.1 KiB
C++
//===-------- EdgeBundles.cpp - Bundles of CFG edges ----------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file provides the implementation of the EdgeBundles analysis.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/CodeGen/EdgeBundles.h"
|
|
#include "llvm/CodeGen/MachineBasicBlock.h"
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
|
#include "llvm/CodeGen/Passes.h"
|
|
#include "llvm/Support/CommandLine.h"
|
|
#include "llvm/Support/GraphWriter.h"
|
|
|
|
using namespace llvm;
|
|
|
|
static cl::opt<bool>
|
|
ViewEdgeBundles("view-edge-bundles", cl::Hidden,
|
|
cl::desc("Pop up a window to show edge bundle graphs"));
|
|
|
|
char EdgeBundles::ID = 0;
|
|
|
|
INITIALIZE_PASS(EdgeBundles, "edge-bundles", "Bundle Machine CFG Edges",
|
|
/* cfg = */true, /* analysis = */ true)
|
|
|
|
char &llvm::EdgeBundlesID = EdgeBundles::ID;
|
|
|
|
void EdgeBundles::getAnalysisUsage(AnalysisUsage &AU) const {
|
|
AU.setPreservesAll();
|
|
MachineFunctionPass::getAnalysisUsage(AU);
|
|
}
|
|
|
|
bool EdgeBundles::runOnMachineFunction(MachineFunction &mf) {
|
|
MF = &mf;
|
|
EC.clear();
|
|
EC.grow(2 * MF->getNumBlockIDs());
|
|
|
|
for (MachineFunction::const_iterator I = MF->begin(), E = MF->end(); I != E;
|
|
++I) {
|
|
const MachineBasicBlock &MBB = *I;
|
|
unsigned OutE = 2 * MBB.getNumber() + 1;
|
|
// Join the outgoing bundle with the ingoing bundles of all successors.
|
|
for (MachineBasicBlock::const_succ_iterator SI = MBB.succ_begin(),
|
|
SE = MBB.succ_end(); SI != SE; ++SI)
|
|
EC.join(OutE, 2 * (*SI)->getNumber());
|
|
}
|
|
EC.compress();
|
|
if (ViewEdgeBundles)
|
|
view();
|
|
|
|
// Compute the reverse mapping.
|
|
Blocks.clear();
|
|
Blocks.resize(getNumBundles());
|
|
|
|
for (unsigned i = 0, e = MF->getNumBlockIDs(); i != e; ++i) {
|
|
unsigned b0 = getBundle(i, 0);
|
|
unsigned b1 = getBundle(i, 1);
|
|
Blocks[b0].push_back(i);
|
|
if (b1 != b0)
|
|
Blocks[b1].push_back(i);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/// view - Visualize the annotated bipartite CFG with Graphviz.
|
|
void EdgeBundles::view() const {
|
|
ViewGraph(*this, "EdgeBundles");
|
|
}
|
|
|
|
/// Specialize WriteGraph, the standard implementation won't work.
|
|
raw_ostream &llvm::WriteGraph(raw_ostream &O, const EdgeBundles &G,
|
|
bool ShortNames,
|
|
const Twine &Title) {
|
|
const MachineFunction *MF = G.getMachineFunction();
|
|
|
|
O << "digraph {\n";
|
|
for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
|
|
I != E; ++I) {
|
|
unsigned BB = I->getNumber();
|
|
O << "\t\"BB#" << BB << "\" [ shape=box ]\n"
|
|
<< '\t' << G.getBundle(BB, false) << " -> \"BB#" << BB << "\"\n"
|
|
<< "\t\"BB#" << BB << "\" -> " << G.getBundle(BB, true) << '\n';
|
|
for (MachineBasicBlock::const_succ_iterator SI = I->succ_begin(),
|
|
SE = I->succ_end(); SI != SE; ++SI)
|
|
O << "\t\"BB#" << BB << "\" -> \"BB#" << (*SI)->getNumber()
|
|
<< "\" [ color=lightgray ]\n";
|
|
}
|
|
O << "}\n";
|
|
return O;
|
|
}
|