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354 lines
11 KiB
C++
354 lines
11 KiB
C++
//===-- MachineFunction.cpp -----------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Collect native machine code information for a function. This allows
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// target-specific information about the generated code to be stored with each
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// function.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/SSARegMap.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetFrameInfo.h"
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#include "llvm/Function.h"
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#include "llvm/Instructions.h"
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#include "llvm/Support/LeakDetector.h"
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#include "llvm/Support/GraphWriter.h"
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#include "llvm/Config/config.h"
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#include <fstream>
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#include <iostream>
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#include <sstream>
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using namespace llvm;
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static AnnotationID MF_AID(
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AnnotationManager::getID("CodeGen::MachineCodeForFunction"));
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namespace {
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struct Printer : public MachineFunctionPass {
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std::ostream *OS;
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const std::string Banner;
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Printer (std::ostream *_OS, const std::string &_Banner) :
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OS (_OS), Banner (_Banner) { }
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const char *getPassName() const { return "MachineFunction Printer"; }
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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bool runOnMachineFunction(MachineFunction &MF) {
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(*OS) << Banner;
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MF.print (*OS);
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return false;
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}
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};
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}
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/// Returns a newly-created MachineFunction Printer pass. The default output
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/// stream is std::cerr; the default banner is empty.
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///
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FunctionPass *llvm::createMachineFunctionPrinterPass(std::ostream *OS,
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const std::string &Banner){
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return new Printer(OS, Banner);
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}
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namespace {
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struct Deleter : public MachineFunctionPass {
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const char *getPassName() const { return "Machine Code Deleter"; }
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bool runOnMachineFunction(MachineFunction &MF) {
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// Delete the annotation from the function now.
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MachineFunction::destruct(MF.getFunction());
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return true;
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}
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};
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}
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/// MachineCodeDeletion Pass - This pass deletes all of the machine code for
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/// the current function, which should happen after the function has been
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/// emitted to a .s file or to memory.
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FunctionPass *llvm::createMachineCodeDeleter() {
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return new Deleter();
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}
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//===---------------------------------------------------------------------===//
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// MachineFunction implementation
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//===---------------------------------------------------------------------===//
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MachineBasicBlock* ilist_traits<MachineBasicBlock>::createSentinel() {
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MachineBasicBlock* dummy = new MachineBasicBlock();
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LeakDetector::removeGarbageObject(dummy);
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return dummy;
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}
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void ilist_traits<MachineBasicBlock>::transferNodesFromList(
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iplist<MachineBasicBlock, ilist_traits<MachineBasicBlock> >& toList,
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ilist_iterator<MachineBasicBlock> first,
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ilist_iterator<MachineBasicBlock> last) {
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if (Parent != toList.Parent)
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for (; first != last; ++first)
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first->Parent = toList.Parent;
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}
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MachineFunction::MachineFunction(const Function *F,
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const TargetMachine &TM)
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: Annotation(MF_AID), Fn(F), Target(TM), UsedPhysRegs(0) {
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SSARegMapping = new SSARegMap();
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MFInfo = 0;
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FrameInfo = new MachineFrameInfo();
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ConstantPool = new MachineConstantPool();
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BasicBlocks.Parent = this;
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}
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MachineFunction::~MachineFunction() {
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BasicBlocks.clear();
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delete SSARegMapping;
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delete MFInfo;
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delete FrameInfo;
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delete ConstantPool;
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delete[] UsedPhysRegs;
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}
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void MachineFunction::dump() const { print(std::cerr); }
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void MachineFunction::print(std::ostream &OS) const {
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OS << "# Machine code for " << Fn->getName () << "():\n";
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// Print Frame Information
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getFrameInfo()->print(*this, OS);
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// Print Constant Pool
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getConstantPool()->print(OS);
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const MRegisterInfo *MRI = getTarget().getRegisterInfo();
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if (livein_begin() != livein_end()) {
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OS << "Live Ins:";
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for (livein_iterator I = livein_begin(), E = livein_end(); I != E; ++I) {
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if (MRI)
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OS << " " << MRI->getName(I->first);
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else
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OS << " Reg #" << I->first;
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}
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OS << "\n";
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}
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if (liveout_begin() != liveout_end()) {
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OS << "Live Outs:";
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for (liveout_iterator I = liveout_begin(), E = liveout_end(); I != E; ++I)
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if (MRI)
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OS << " " << MRI->getName(*I);
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else
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OS << " Reg #" << *I;
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OS << "\n";
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}
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for (const_iterator BB = begin(); BB != end(); ++BB)
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BB->print(OS);
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OS << "\n# End machine code for " << Fn->getName () << "().\n\n";
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}
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/// CFGOnly flag - This is used to control whether or not the CFG graph printer
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/// prints out the contents of basic blocks or not. This is acceptable because
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/// this code is only really used for debugging purposes.
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///
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static bool CFGOnly = false;
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namespace llvm {
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template<>
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struct DOTGraphTraits<const MachineFunction*> : public DefaultDOTGraphTraits {
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static std::string getGraphName(const MachineFunction *F) {
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return "CFG for '" + F->getFunction()->getName() + "' function";
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}
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static std::string getNodeLabel(const MachineBasicBlock *Node,
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const MachineFunction *Graph) {
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if (CFGOnly && Node->getBasicBlock() &&
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!Node->getBasicBlock()->getName().empty())
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return Node->getBasicBlock()->getName() + ":";
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std::ostringstream Out;
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if (CFGOnly) {
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Out << Node->getNumber() << ':';
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return Out.str();
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}
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Node->print(Out);
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std::string OutStr = Out.str();
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if (OutStr[0] == '\n') OutStr.erase(OutStr.begin());
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// Process string output to make it nicer...
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for (unsigned i = 0; i != OutStr.length(); ++i)
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if (OutStr[i] == '\n') { // Left justify
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OutStr[i] = '\\';
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OutStr.insert(OutStr.begin()+i+1, 'l');
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}
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return OutStr;
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}
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};
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}
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void MachineFunction::viewCFG() const
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{
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#ifndef NDEBUG
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std::string Filename = "/tmp/cfg." + getFunction()->getName() + ".dot";
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std::cerr << "Writing '" << Filename << "'... ";
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std::ofstream F(Filename.c_str());
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if (!F) {
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std::cerr << " error opening file for writing!\n";
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return;
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}
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WriteGraph(F, this);
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F.close();
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std::cerr << "\n";
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#ifdef HAVE_GRAPHVIZ
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std::cerr << "Running 'Graphviz' program... " << std::flush;
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if (system((LLVM_PATH_GRAPHVIZ " " + Filename).c_str())) {
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std::cerr << "Error viewing graph: 'Graphviz' not in path?\n";
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} else {
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system(("rm " + Filename).c_str());
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return;
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}
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#endif // HAVE_GRAPHVIZ
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#ifdef HAVE_GV
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std::cerr << "Running 'dot' program... " << std::flush;
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if (system(("dot -Tps -Nfontname=Courier -Gsize=7.5,10 " + Filename
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+ " > /tmp/cfg.tempgraph.ps").c_str())) {
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std::cerr << "Error running dot: 'dot' not in path?\n";
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} else {
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std::cerr << "\n";
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system("gv /tmp/cfg.tempgraph.ps");
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}
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system(("rm " + Filename + " /tmp/cfg.tempgraph.ps").c_str());
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return;
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#endif // HAVE_GV
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#endif // NDEBUG
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std::cerr << "MachineFunction::viewCFG is only available in debug builds on "
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<< "systems with Graphviz or gv!\n";
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#ifndef NDEBUG
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system(("rm " + Filename).c_str());
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#endif
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}
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void MachineFunction::viewCFGOnly() const
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{
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CFGOnly = true;
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viewCFG();
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CFGOnly = false;
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}
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// The next two methods are used to construct and to retrieve
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// the MachineCodeForFunction object for the given function.
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// construct() -- Allocates and initializes for a given function and target
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// get() -- Returns a handle to the object.
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// This should not be called before "construct()"
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// for a given Function.
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//
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MachineFunction&
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MachineFunction::construct(const Function *Fn, const TargetMachine &Tar)
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{
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assert(Fn->getAnnotation(MF_AID) == 0 &&
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"Object already exists for this function!");
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MachineFunction* mcInfo = new MachineFunction(Fn, Tar);
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Fn->addAnnotation(mcInfo);
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return *mcInfo;
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}
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void MachineFunction::destruct(const Function *Fn) {
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bool Deleted = Fn->deleteAnnotation(MF_AID);
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assert(Deleted && "Machine code did not exist for function!");
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}
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MachineFunction& MachineFunction::get(const Function *F)
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{
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MachineFunction *mc = (MachineFunction*)F->getAnnotation(MF_AID);
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assert(mc && "Call construct() method first to allocate the object");
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return *mc;
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}
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void MachineFunction::clearSSARegMap() {
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delete SSARegMapping;
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SSARegMapping = 0;
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}
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//===----------------------------------------------------------------------===//
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// MachineFrameInfo implementation
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//===----------------------------------------------------------------------===//
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/// CreateStackObject - Create a stack object for a value of the specified type.
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///
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int MachineFrameInfo::CreateStackObject(const Type *Ty, const TargetData &TD) {
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return CreateStackObject((unsigned)TD.getTypeSize(Ty),
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TD.getTypeAlignment(Ty));
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}
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void MachineFrameInfo::print(const MachineFunction &MF, std::ostream &OS) const{
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int ValOffset = MF.getTarget().getFrameInfo()->getOffsetOfLocalArea();
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for (unsigned i = 0, e = Objects.size(); i != e; ++i) {
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const StackObject &SO = Objects[i];
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OS << " <fi #" << (int)(i-NumFixedObjects) << ">: ";
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if (SO.Size == 0)
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OS << "variable sized";
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else
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OS << "size is " << SO.Size << " byte" << (SO.Size != 1 ? "s," : ",");
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OS << " alignment is " << SO.Alignment << " byte"
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<< (SO.Alignment != 1 ? "s," : ",");
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if (i < NumFixedObjects)
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OS << " fixed";
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if (i < NumFixedObjects || SO.SPOffset != -1) {
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int Off = SO.SPOffset - ValOffset;
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OS << " at location [SP";
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if (Off > 0)
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OS << "+" << Off;
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else if (Off < 0)
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OS << Off;
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OS << "]";
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}
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OS << "\n";
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}
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if (HasVarSizedObjects)
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OS << " Stack frame contains variable sized objects\n";
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}
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void MachineFrameInfo::dump(const MachineFunction &MF) const {
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print(MF, std::cerr);
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}
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//===----------------------------------------------------------------------===//
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// MachineConstantPool implementation
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//===----------------------------------------------------------------------===//
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void MachineConstantPool::print(std::ostream &OS) const {
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for (unsigned i = 0, e = Constants.size(); i != e; ++i)
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OS << " <cp #" << i << "> is" << *(Value*)Constants[i] << "\n";
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}
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void MachineConstantPool::dump() const { print(std::cerr); }
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