forked from OSchip/llvm-project
398 lines
13 KiB
C++
398 lines
13 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/MachineCodeForInstruction.h"
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#include "llvm/CodeGen/SSARegMap.h"
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#include "llvm/CodeGen/MachineFunctionInfo.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/Target/TargetCacheInfo.h"
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#include "llvm/Function.h"
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#include "llvm/iOther.h"
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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 all of the MachineInstrs out of the function. When the sparc
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// backend gets fixed, this can be dramatically simpler, but actually
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// putting this stuff into the MachineBasicBlock destructor!
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for (MachineFunction::iterator BB = MF.begin(), E = MF.end(); BB != E;
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++BB)
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while (!BB->empty())
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delete BB->pop_back();
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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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MachineFunction::MachineFunction(const Function *F,
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const TargetMachine &TM)
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: Annotation(MF_AID), Fn(F), Target(TM) {
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SSARegMapping = new SSARegMap();
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MFInfo = new MachineFunctionInfo(*this);
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FrameInfo = new MachineFrameInfo();
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ConstantPool = new MachineConstantPool();
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}
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MachineFunction::~MachineFunction() {
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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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}
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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 << "\n" << *(Value*)Fn->getFunctionType() << " \"" << Fn->getName()
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<< "\"\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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for (const_iterator BB = begin(); BB != end(); ++BB) {
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const BasicBlock *LBB = BB->getBasicBlock();
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OS << "\n" << LBB->getName() << " (" << (const void*)LBB << "):\n";
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for (MachineBasicBlock::const_iterator I = BB->begin(); I != BB->end();++I){
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OS << "\t";
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(*I)->print(OS, Target);
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}
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}
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OS << "\nEnd function \"" << Fn->getName() << "\"\n\n";
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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(TD.getTypeSize(Ty), TD.getTypeAlignment(Ty));
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}
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int MachineFrameInfo::CreateStackObject(const TargetRegisterClass *RC) {
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return CreateStackObject(RC->getSize(), RC->getAlignment());
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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) << "> is ";
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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 << SO.Size << " byte" << (SO.Size != 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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//===----------------------------------------------------------------------===//
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// MachineFunctionInfo implementation
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//===----------------------------------------------------------------------===//
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static unsigned
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ComputeMaxOptionalArgsSize(const TargetMachine& target, const Function *F,
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unsigned &maxOptionalNumArgs)
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{
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const TargetFrameInfo &frameInfo = target.getFrameInfo();
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unsigned maxSize = 0;
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for (Function::const_iterator BB = F->begin(), BBE = F->end(); BB !=BBE; ++BB)
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for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I != E; ++I)
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if (const CallInst *callInst = dyn_cast<CallInst>(I))
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{
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unsigned numOperands = callInst->getNumOperands() - 1;
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int numExtra = (int)numOperands-frameInfo.getNumFixedOutgoingArgs();
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if (numExtra <= 0)
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continue;
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unsigned sizeForThisCall;
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if (frameInfo.argsOnStackHaveFixedSize())
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{
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int argSize = frameInfo.getSizeOfEachArgOnStack();
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sizeForThisCall = numExtra * (unsigned) argSize;
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}
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else
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{
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assert(0 && "UNTESTED CODE: Size per stack argument is not "
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"fixed on this architecture: use actual arg sizes to "
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"compute MaxOptionalArgsSize");
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sizeForThisCall = 0;
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for (unsigned i = 0; i < numOperands; ++i)
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sizeForThisCall += target.getTargetData().getTypeSize(callInst->
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getOperand(i)->getType());
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}
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if (maxSize < sizeForThisCall)
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maxSize = sizeForThisCall;
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if ((int)maxOptionalNumArgs < numExtra)
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maxOptionalNumArgs = (unsigned) numExtra;
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}
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return maxSize;
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}
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// Align data larger than one L1 cache line on L1 cache line boundaries.
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// Align all smaller data on the next higher 2^x boundary (4, 8, ...),
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// but not higher than the alignment of the largest type we support
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// (currently a double word). -- see class TargetData).
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//
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// This function is similar to the corresponding function in EmitAssembly.cpp
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// but they are unrelated. This one does not align at more than a
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// double-word boundary whereas that one might.
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//
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inline unsigned
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SizeToAlignment(unsigned size, const TargetMachine& target)
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{
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unsigned short cacheLineSize = target.getCacheInfo().getCacheLineSize(1);
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if (size > (unsigned) cacheLineSize / 2)
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return cacheLineSize;
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else
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for (unsigned sz=1; /*no condition*/; sz *= 2)
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if (sz >= size || sz >= target.getTargetData().getDoubleAlignment())
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return sz;
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}
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void MachineFunctionInfo::CalculateArgSize() {
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maxOptionalArgsSize = ComputeMaxOptionalArgsSize(MF.getTarget(),
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MF.getFunction(),
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maxOptionalNumArgs);
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staticStackSize = maxOptionalArgsSize
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+ MF.getTarget().getFrameInfo().getMinStackFrameSize();
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}
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int
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MachineFunctionInfo::computeOffsetforLocalVar(const Value* val,
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unsigned &getPaddedSize,
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unsigned sizeToUse)
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{
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if (sizeToUse == 0)
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sizeToUse = MF.getTarget().findOptimalStorageSize(val->getType());
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unsigned align = SizeToAlignment(sizeToUse, MF.getTarget());
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bool growUp;
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int firstOffset = MF.getTarget().getFrameInfo().getFirstAutomaticVarOffset(MF,
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growUp);
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int offset = growUp? firstOffset + getAutomaticVarsSize()
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: firstOffset - (getAutomaticVarsSize() + sizeToUse);
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int aligned = MF.getTarget().getFrameInfo().adjustAlignment(offset, growUp, align);
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getPaddedSize = sizeToUse + abs(aligned - offset);
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return aligned;
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}
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int MachineFunctionInfo::allocateLocalVar(const Value* val,
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unsigned sizeToUse) {
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assert(! automaticVarsAreaFrozen &&
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"Size of auto vars area has been used to compute an offset so "
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"no more automatic vars should be allocated!");
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// Check if we've allocated a stack slot for this value already
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//
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hash_map<const Value*, int>::const_iterator pair = offsets.find(val);
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if (pair != offsets.end())
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return pair->second;
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unsigned getPaddedSize;
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unsigned offset = computeOffsetforLocalVar(val, getPaddedSize, sizeToUse);
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offsets[val] = offset;
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incrementAutomaticVarsSize(getPaddedSize);
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return offset;
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}
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int
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MachineFunctionInfo::allocateSpilledValue(const Type* type)
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{
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assert(! spillsAreaFrozen &&
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"Size of reg spills area has been used to compute an offset so "
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"no more register spill slots should be allocated!");
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unsigned size = MF.getTarget().getTargetData().getTypeSize(type);
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unsigned char align = MF.getTarget().getTargetData().getTypeAlignment(type);
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bool growUp;
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int firstOffset = MF.getTarget().getFrameInfo().getRegSpillAreaOffset(MF, growUp);
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int offset = growUp? firstOffset + getRegSpillsSize()
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: firstOffset - (getRegSpillsSize() + size);
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int aligned = MF.getTarget().getFrameInfo().adjustAlignment(offset, growUp, align);
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size += abs(aligned - offset); // include alignment padding in size
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incrementRegSpillsSize(size); // update size of reg. spills area
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return aligned;
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}
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int
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MachineFunctionInfo::pushTempValue(unsigned size)
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{
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unsigned align = SizeToAlignment(size, MF.getTarget());
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bool growUp;
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int firstOffset = MF.getTarget().getFrameInfo().getTmpAreaOffset(MF, growUp);
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int offset = growUp? firstOffset + currentTmpValuesSize
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: firstOffset - (currentTmpValuesSize + size);
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int aligned = MF.getTarget().getFrameInfo().adjustAlignment(offset, growUp,
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align);
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size += abs(aligned - offset); // include alignment padding in size
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incrementTmpAreaSize(size); // update "current" size of tmp area
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return aligned;
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}
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void MachineFunctionInfo::popAllTempValues() {
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resetTmpAreaSize(); // clear tmp area to reuse
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}
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