//===-- MachineFunction.cpp -----------------------------------------------===//
-//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
// Collect native machine code information for a function. This allows
// target-specific information about the generated code to be stored with each
// function.
//
//===----------------------------------------------------------------------===//
-#include "llvm/CodeGen/MachineInstr.h" // For debug output
-#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineCodeForInstruction.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/SSARegMap.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineConstantPool.h"
+#include "llvm/CodeGen/Passes.h"
#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/MachineFrameInfo.h"
-#include "llvm/Target/MachineCacheInfo.h"
+#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Function.h"
-#include "llvm/iOther.h"
-#include "llvm/Pass.h"
-#include <limits.h>
+#include "llvm/Instructions.h"
+#include "llvm/Support/LeakDetector.h"
+#include "llvm/Support/GraphWriter.h"
+#include "llvm/Config/config.h"
+#include <fstream>
+#include <iostream>
+#include <sstream>
-const int INVALID_FRAME_OFFSET = INT_MAX; // std::numeric_limits<int>::max();
+using namespace llvm;
static AnnotationID MF_AID(
- AnnotationManager::getID("CodeGen::MachineCodeForFunction"));
-
+ AnnotationManager::getID("CodeGen::MachineCodeForFunction"));
-//===---------------------------------------------------------------------===//
-// Code generation/destruction passes
-//===---------------------------------------------------------------------===//
namespace {
- class ConstructMachineFunction : public FunctionPass {
- TargetMachine &Target;
- public:
- ConstructMachineFunction(TargetMachine &T) : Target(T) {}
-
- const char *getPassName() const {
- return "ConstructMachineFunction";
+ struct Printer : public MachineFunctionPass {
+ std::ostream *OS;
+ const std::string Banner;
+
+ Printer (std::ostream *_OS, const std::string &_Banner) :
+ OS (_OS), Banner (_Banner) { }
+
+ const char *getPassName() const { return "MachineFunction Printer"; }
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.setPreservesAll();
}
-
- bool runOnFunction(Function &F) {
- MachineFunction::construct(&F, Target);
+
+ bool runOnMachineFunction(MachineFunction &MF) {
+ (*OS) << Banner;
+ MF.print (*OS);
return false;
}
};
+}
- struct DestroyMachineFunction : public FunctionPass {
- const char *getPassName() const { return "FreeMachineFunction"; }
-
- static void freeMachineCode(Instruction &I) {
- MachineCodeForInstruction::destroy(&I);
- }
-
- bool runOnFunction(Function &F) {
- for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE; ++FI)
- for (BasicBlock::iterator I = FI->begin(), E = FI->end(); I != E; ++I)
- MachineCodeForInstruction::get(I).dropAllReferences();
-
- for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE; ++FI)
- for_each(FI->begin(), FI->end(), freeMachineCode);
-
- return false;
+/// Returns a newly-created MachineFunction Printer pass. The default output
+/// stream is std::cerr; the default banner is empty.
+///
+FunctionPass *llvm::createMachineFunctionPrinterPass(std::ostream *OS,
+ const std::string &Banner){
+ return new Printer(OS, Banner);
+}
+
+namespace {
+ struct Deleter : public MachineFunctionPass {
+ const char *getPassName() const { return "Machine Code Deleter"; }
+
+ bool runOnMachineFunction(MachineFunction &MF) {
+ // Delete the annotation from the function now.
+ MachineFunction::destruct(MF.getFunction());
+ return true;
}
};
}
-Pass *createMachineCodeConstructionPass(TargetMachine &Target) {
- return new ConstructMachineFunction(Target);
+/// MachineCodeDeletion Pass - This pass deletes all of the machine code for
+/// the current function, which should happen after the function has been
+/// emitted to a .s file or to memory.
+FunctionPass *llvm::createMachineCodeDeleter() {
+ return new Deleter();
}
-Pass *createMachineCodeDestructionPass() {
- return new DestroyMachineFunction();
-}
//===---------------------------------------------------------------------===//
// MachineFunction implementation
//===---------------------------------------------------------------------===//
+MachineBasicBlock* ilist_traits<MachineBasicBlock>::createSentinel() {
+ MachineBasicBlock* dummy = new MachineBasicBlock();
+ LeakDetector::removeGarbageObject(dummy);
+ return dummy;
+}
+
+void ilist_traits<MachineBasicBlock>::transferNodesFromList(
+ iplist<MachineBasicBlock, ilist_traits<MachineBasicBlock> >& toList,
+ ilist_iterator<MachineBasicBlock> first,
+ ilist_iterator<MachineBasicBlock> last) {
+ if (Parent != toList.Parent)
+ for (; first != last; ++first)
+ first->Parent = toList.Parent;
+}
+
+MachineFunction::MachineFunction(const Function *F,
+ const TargetMachine &TM)
+ : Annotation(MF_AID), Fn(F), Target(TM), UsedPhysRegs(0) {
+ SSARegMapping = new SSARegMap();
+ MFInfo = 0;
+ FrameInfo = new MachineFrameInfo();
+ ConstantPool = new MachineConstantPool(TM.getTargetData());
+ BasicBlocks.Parent = this;
+}
+
+MachineFunction::~MachineFunction() {
+ BasicBlocks.clear();
+ delete SSARegMapping;
+ delete MFInfo;
+ delete FrameInfo;
+ delete ConstantPool;
+ delete[] UsedPhysRegs;
+}
+
+void MachineFunction::dump() const { print(std::cerr); }
+
+void MachineFunction::print(std::ostream &OS) const {
+ OS << "# Machine code for " << Fn->getName () << "():\n";
+
+ // Print Frame Information
+ getFrameInfo()->print(*this, OS);
+
+ // Print Constant Pool
+ getConstantPool()->print(OS);
+
+ const MRegisterInfo *MRI = getTarget().getRegisterInfo();
+
+ if (livein_begin() != livein_end()) {
+ OS << "Live Ins:";
+ for (livein_iterator I = livein_begin(), E = livein_end(); I != E; ++I) {
+ if (MRI)
+ OS << " " << MRI->getName(I->first);
+ else
+ OS << " Reg #" << I->first;
+ }
+ OS << "\n";
+ }
+ if (liveout_begin() != liveout_end()) {
+ OS << "Live Outs:";
+ for (liveout_iterator I = liveout_begin(), E = liveout_end(); I != E; ++I)
+ if (MRI)
+ OS << " " << MRI->getName(*I);
+ else
+ OS << " Reg #" << *I;
+ OS << "\n";
+ }
+
+ for (const_iterator BB = begin(); BB != end(); ++BB)
+ BB->print(OS);
+
+ OS << "\n# End machine code for " << Fn->getName () << "().\n\n";
+}
+
+/// CFGOnly flag - This is used to control whether or not the CFG graph printer
+/// prints out the contents of basic blocks or not. This is acceptable because
+/// this code is only really used for debugging purposes.
+///
+static bool CFGOnly = false;
+
+namespace llvm {
+ template<>
+ struct DOTGraphTraits<const MachineFunction*> : public DefaultDOTGraphTraits {
+ static std::string getGraphName(const MachineFunction *F) {
+ return "CFG for '" + F->getFunction()->getName() + "' function";
+ }
+
+ static std::string getNodeLabel(const MachineBasicBlock *Node,
+ const MachineFunction *Graph) {
+ if (CFGOnly && Node->getBasicBlock() &&
+ !Node->getBasicBlock()->getName().empty())
+ return Node->getBasicBlock()->getName() + ":";
+
+ std::ostringstream Out;
+ if (CFGOnly) {
+ Out << Node->getNumber() << ':';
+ return Out.str();
+ }
+
+ Node->print(Out);
+
+ std::string OutStr = Out.str();
+ if (OutStr[0] == '\n') OutStr.erase(OutStr.begin());
+
+ // Process string output to make it nicer...
+ for (unsigned i = 0; i != OutStr.length(); ++i)
+ if (OutStr[i] == '\n') { // Left justify
+ OutStr[i] = '\\';
+ OutStr.insert(OutStr.begin()+i+1, 'l');
+ }
+ return OutStr;
+ }
+ };
+}
+
+void MachineFunction::viewCFG() const
+{
+#ifndef NDEBUG
+ std::string Filename = "/tmp/cfg." + getFunction()->getName() + ".dot";
+ std::cerr << "Writing '" << Filename << "'... ";
+ std::ofstream F(Filename.c_str());
+
+ if (!F) {
+ std::cerr << " error opening file for writing!\n";
+ return;
+ }
+
+ WriteGraph(F, this);
+ F.close();
+ std::cerr << "\n";
+
+#ifdef HAVE_GRAPHVIZ
+ std::cerr << "Running 'Graphviz' program... " << std::flush;
+ if (system((LLVM_PATH_GRAPHVIZ " " + Filename).c_str())) {
+ std::cerr << "Error viewing graph: 'Graphviz' not in path?\n";
+ } else {
+ system(("rm " + Filename).c_str());
+ return;
+ }
+#endif // HAVE_GRAPHVIZ
+
+#ifdef HAVE_GV
+ std::cerr << "Running 'dot' program... " << std::flush;
+ if (system(("dot -Tps -Nfontname=Courier -Gsize=7.5,10 " + Filename
+ + " > /tmp/cfg.tempgraph.ps").c_str())) {
+ std::cerr << "Error running dot: 'dot' not in path?\n";
+ } else {
+ std::cerr << "\n";
+ system("gv /tmp/cfg.tempgraph.ps");
+ }
+ system(("rm " + Filename + " /tmp/cfg.tempgraph.ps").c_str());
+ return;
+#endif // HAVE_GV
+#endif // NDEBUG
+ std::cerr << "MachineFunction::viewCFG is only available in debug builds on "
+ << "systems with Graphviz or gv!\n";
+
+#ifndef NDEBUG
+ system(("rm " + Filename).c_str());
+#endif
+}
+
+void MachineFunction::viewCFGOnly() const
+{
+ CFGOnly = true;
+ viewCFG();
+ CFGOnly = false;
+}
+
// The next two methods are used to construct and to retrieve
// the MachineCodeForFunction object for the given function.
// construct() -- Allocates and initializes for a given function and target
// get() -- Returns a handle to the object.
// This should not be called before "construct()"
// for a given Function.
-//
+//
MachineFunction&
MachineFunction::construct(const Function *Fn, const TargetMachine &Tar)
{
return *mcInfo;
}
-void
-MachineFunction::destruct(const Function *Fn)
-{
+void MachineFunction::destruct(const Function *Fn) {
bool Deleted = Fn->deleteAnnotation(MF_AID);
assert(Deleted && "Machine code did not exist for function!");
}
return *mc;
}
-static unsigned
-ComputeMaxOptionalArgsSize(const TargetMachine& target, const Function *F,
- unsigned &maxOptionalNumArgs)
-{
- const MachineFrameInfo& frameInfo = target.getFrameInfo();
-
- unsigned maxSize = 0;
-
- for (Function::const_iterator BB = F->begin(), BBE = F->end(); BB !=BBE; ++BB)
- for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I != E; ++I)
- if (const CallInst *callInst = dyn_cast<CallInst>(&*I))
- {
- unsigned numOperands = callInst->getNumOperands() - 1;
- int numExtra = (int)numOperands-frameInfo.getNumFixedOutgoingArgs();
- if (numExtra <= 0)
- continue;
-
- unsigned int sizeForThisCall;
- if (frameInfo.argsOnStackHaveFixedSize())
- {
- int argSize = frameInfo.getSizeOfEachArgOnStack();
- sizeForThisCall = numExtra * (unsigned) argSize;
- }
- else
- {
- assert(0 && "UNTESTED CODE: Size per stack argument is not "
- "fixed on this architecture: use actual arg sizes to "
- "compute MaxOptionalArgsSize");
- sizeForThisCall = 0;
- for (unsigned i = 0; i < numOperands; ++i)
- sizeForThisCall += target.DataLayout.getTypeSize(callInst->
- getOperand(i)->getType());
- }
-
- if (maxSize < sizeForThisCall)
- maxSize = sizeForThisCall;
-
- if ((int)maxOptionalNumArgs < numExtra)
- maxOptionalNumArgs = (unsigned) numExtra;
- }
-
- return maxSize;
-}
-
-// Align data larger than one L1 cache line on L1 cache line boundaries.
-// Align all smaller data on the next higher 2^x boundary (4, 8, ...),
-// but not higher than the alignment of the largest type we support
-// (currently a double word). -- see class TargetData).
-//
-// This function is similar to the corresponding function in EmitAssembly.cpp
-// but they are unrelated. This one does not align at more than a
-// double-word boundary whereas that one might.
-//
-inline unsigned int
-SizeToAlignment(unsigned int size, const TargetMachine& target)
-{
- unsigned short cacheLineSize = target.getCacheInfo().getCacheLineSize(1);
- if (size > (unsigned) cacheLineSize / 2)
- return cacheLineSize;
- else
- for (unsigned sz=1; /*no condition*/; sz *= 2)
- if (sz >= size || sz >= target.DataLayout.getDoubleAlignment())
- return sz;
+void MachineFunction::clearSSARegMap() {
+ delete SSARegMapping;
+ SSARegMapping = 0;
}
+//===----------------------------------------------------------------------===//
+// MachineFrameInfo implementation
+//===----------------------------------------------------------------------===//
-/*ctor*/
-MachineFunction::MachineFunction(const Function *F,
- const TargetMachine& target)
- : Annotation(MF_AID),
- Fn(F), Target(target), staticStackSize(0),
- automaticVarsSize(0), regSpillsSize(0),
- maxOptionalArgsSize(0), maxOptionalNumArgs(0),
- currentTmpValuesSize(0), maxTmpValuesSize(0), compiledAsLeaf(false),
- spillsAreaFrozen(false), automaticVarsAreaFrozen(false)
-{
- maxOptionalArgsSize = ComputeMaxOptionalArgsSize(target, Fn,
- maxOptionalNumArgs);
- staticStackSize = maxOptionalArgsSize
- + target.getFrameInfo().getMinStackFrameSize();
+/// CreateStackObject - Create a stack object for a value of the specified type.
+///
+int MachineFrameInfo::CreateStackObject(const Type *Ty, const TargetData &TD) {
+ return CreateStackObject((unsigned)TD.getTypeSize(Ty),
+ TD.getTypeAlignment(Ty));
}
-int
-MachineFunction::computeOffsetforLocalVar(const TargetMachine& target,
- const Value* val,
- unsigned int& getPaddedSize,
- unsigned int sizeToUse)
-{
- if (sizeToUse == 0)
- sizeToUse = target.findOptimalStorageSize(val->getType());
- unsigned int align = SizeToAlignment(sizeToUse, target);
-
- bool growUp;
- int firstOffset = target.getFrameInfo().getFirstAutomaticVarOffset(*this,
- growUp);
- int offset = growUp? firstOffset + getAutomaticVarsSize()
- : firstOffset - (getAutomaticVarsSize() + sizeToUse);
- int aligned = target.getFrameInfo().adjustAlignment(offset, growUp, align);
- getPaddedSize = sizeToUse + abs(aligned - offset);
+void MachineFrameInfo::print(const MachineFunction &MF, std::ostream &OS) const{
+ int ValOffset = MF.getTarget().getFrameInfo()->getOffsetOfLocalArea();
+
+ for (unsigned i = 0, e = Objects.size(); i != e; ++i) {
+ const StackObject &SO = Objects[i];
+ OS << " <fi #" << (int)(i-NumFixedObjects) << ">: ";
+ if (SO.Size == 0)
+ OS << "variable sized";
+ else
+ OS << "size is " << SO.Size << " byte" << (SO.Size != 1 ? "s," : ",");
+ OS << " alignment is " << SO.Alignment << " byte"
+ << (SO.Alignment != 1 ? "s," : ",");
+
+ if (i < NumFixedObjects)
+ OS << " fixed";
+ if (i < NumFixedObjects || SO.SPOffset != -1) {
+ int Off = SO.SPOffset - ValOffset;
+ OS << " at location [SP";
+ if (Off > 0)
+ OS << "+" << Off;
+ else if (Off < 0)
+ OS << Off;
+ OS << "]";
+ }
+ OS << "\n";
+ }
- return aligned;
+ if (HasVarSizedObjects)
+ OS << " Stack frame contains variable sized objects\n";
}
-int
-MachineFunction::allocateLocalVar(const TargetMachine& target,
- const Value* val,
- unsigned int sizeToUse)
-{
- assert(! automaticVarsAreaFrozen &&
- "Size of auto vars area has been used to compute an offset so "
- "no more automatic vars should be allocated!");
-
- // Check if we've allocated a stack slot for this value already
- //
- int offset = getOffset(val);
- if (offset == INVALID_FRAME_OFFSET)
- {
- unsigned int getPaddedSize;
- offset = computeOffsetforLocalVar(target, val, getPaddedSize, sizeToUse);
- offsets[val] = offset;
- incrementAutomaticVarsSize(getPaddedSize);
- }
- return offset;
+void MachineFrameInfo::dump(const MachineFunction &MF) const {
+ print(MF, std::cerr);
}
-int
-MachineFunction::allocateSpilledValue(const TargetMachine& target,
- const Type* type)
-{
- assert(! spillsAreaFrozen &&
- "Size of reg spills area has been used to compute an offset so "
- "no more register spill slots should be allocated!");
-
- unsigned int size = target.DataLayout.getTypeSize(type);
- unsigned char align = target.DataLayout.getTypeAlignment(type);
+
+//===----------------------------------------------------------------------===//
+// MachineConstantPool implementation
+//===----------------------------------------------------------------------===//
+
+/// getConstantPoolIndex - Create a new entry in the constant pool or return
+/// an existing one. User must specify an alignment in bytes for the object.
+///
+unsigned MachineConstantPool::getConstantPoolIndex(Constant *C,
+ unsigned Alignment) {
+ assert(Alignment && "Alignment must be specified!");
+ if (Alignment > PoolAlignment) PoolAlignment = Alignment;
- bool growUp;
- int firstOffset = target.getFrameInfo().getRegSpillAreaOffset(*this, growUp);
+ // Check to see if we already have this constant.
+ //
+ // FIXME, this could be made much more efficient for large constant pools.
+ unsigned AlignMask = (1 << Alignment)-1;
+ for (unsigned i = 0, e = Constants.size(); i != e; ++i)
+ if (Constants[i].Val == C && (Constants[i].Offset & AlignMask) == 0)
+ return i;
- int offset = growUp? firstOffset + getRegSpillsSize()
- : firstOffset - (getRegSpillsSize() + size);
-
- int aligned = target.getFrameInfo().adjustAlignment(offset, growUp, align);
- size += abs(aligned - offset); // include alignment padding in size
+ unsigned Offset = 0;
+ if (!Constants.empty()) {
+ Offset = Constants.back().Offset;
+ Offset += TD.getTypeSize(Constants.back().Val->getType());
+ Offset = (Offset+AlignMask)&~AlignMask;
+ }
- incrementRegSpillsSize(size); // update size of reg. spills area
-
- return aligned;
+ Constants.push_back(MachineConstantPoolEntry(C, Offset));
+ return Constants.size()-1;
}
-int
-MachineFunction::pushTempValue(const TargetMachine& target,
- unsigned int size)
-{
- unsigned int align = SizeToAlignment(size, target);
-
- bool growUp;
- int firstOffset = target.getFrameInfo().getTmpAreaOffset(*this, growUp);
-
- int offset = growUp? firstOffset + currentTmpValuesSize
- : firstOffset - (currentTmpValuesSize + size);
- int aligned = target.getFrameInfo().adjustAlignment(offset, growUp, align);
- size += abs(aligned - offset); // include alignment padding in size
-
- incrementTmpAreaSize(size); // update "current" size of tmp area
-
- return aligned;
-}
-
-void
-MachineFunction::popAllTempValues(const TargetMachine& target)
-{
- resetTmpAreaSize(); // clear tmp area to reuse
-}
-
-int
-MachineFunction::getOffset(const Value* val) const
-{
- hash_map<const Value*, int>::const_iterator pair = offsets.find(val);
- return (pair == offsets.end()) ? INVALID_FRAME_OFFSET : pair->second;
-}
-
-void
-MachineFunction::dump() const
-{
- std::cerr << "\n" << Fn->getReturnType()
- << " \"" << Fn->getName() << "\"\n";
-
- for (const_iterator BB = begin(); BB != end(); ++BB) {
- std::cerr << "\n" << BB->getBasicBlock()->getName() << " ("
- << (const void*)BB->getBasicBlock() << ")" << ":" << "\n";
- for (MachineBasicBlock::const_iterator I = BB->begin(); I != BB->end(); ++I)
- std::cerr << "\t" << *I;
+void MachineConstantPool::print(std::ostream &OS) const {
+ for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
+ OS << " <cp #" << i << "> is" << *(Value*)Constants[i].Val;
+ OS << " , offset=" << Constants[i].Offset;
+ OS << "\n";
}
- std::cerr << "\nEnd function \"" << Fn->getName() << "\"\n\n";
}
+
+void MachineConstantPool::dump() const { print(std::cerr); }