mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-20 11:29:24 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4351 91177308-0d34-0410-b5e6-96231b3b80d8
308 lines
10 KiB
C++
308 lines
10 KiB
C++
//===-- MachineFunction.cpp -----------------------------------------------===//
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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/MachineInstr.h" // For debug output
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineCodeForInstruction.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/MachineFrameInfo.h"
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#include "llvm/Target/MachineCacheInfo.h"
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#include "llvm/Function.h"
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#include "llvm/iOther.h"
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#include "llvm/Pass.h"
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#include <limits.h>
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const int INVALID_FRAME_OFFSET = INT_MAX; // std::numeric_limits<int>::max();
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static AnnotationID MCFM_AID(
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AnnotationManager::getID("CodeGen::MachineCodeForFunction"));
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//===---------------------------------------------------------------------===//
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// Code generation/destruction passes
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//===---------------------------------------------------------------------===//
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namespace {
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class ConstructMachineFunction : public FunctionPass {
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TargetMachine &Target;
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public:
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ConstructMachineFunction(TargetMachine &T) : Target(T) {}
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const char *getPassName() const {
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return "ConstructMachineFunction";
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}
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bool runOnFunction(Function &F) {
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MachineFunction::construct(&F, Target);
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return false;
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}
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};
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struct DestroyMachineFunction : public FunctionPass {
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const char *getPassName() const { return "FreeMachineFunction"; }
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static void freeMachineCode(Instruction &I) {
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MachineCodeForInstruction::destroy(&I);
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}
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bool runOnFunction(Function &F) {
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for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE; ++FI)
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for (BasicBlock::iterator I = FI->begin(), E = FI->end(); I != E; ++I)
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MachineCodeForInstruction::get(I).dropAllReferences();
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for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE; ++FI)
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for_each(FI->begin(), FI->end(), freeMachineCode);
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return false;
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}
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};
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}
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Pass *createMachineCodeConstructionPass(TargetMachine &Target) {
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return new ConstructMachineFunction(Target);
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}
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Pass *createMachineCodeDestructionPass() {
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return new DestroyMachineFunction();
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}
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//===---------------------------------------------------------------------===//
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// MachineFunction implementation
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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(MCFM_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
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MachineFunction::destruct(const Function *Fn)
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{
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bool Deleted = Fn->deleteAnnotation(MCFM_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(MCFM_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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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 MachineFrameInfo& 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 int 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.DataLayout.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 int
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SizeToAlignment(unsigned int 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.DataLayout.getDoubleAlignment())
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return sz;
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}
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/*ctor*/
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MachineFunction::MachineFunction(const Function *F,
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const TargetMachine& target)
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: Annotation(MCFM_AID),
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Fn(F), Target(target), staticStackSize(0),
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automaticVarsSize(0), regSpillsSize(0),
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maxOptionalArgsSize(0), maxOptionalNumArgs(0),
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currentTmpValuesSize(0), maxTmpValuesSize(0), compiledAsLeaf(false),
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spillsAreaFrozen(false), automaticVarsAreaFrozen(false)
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{
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maxOptionalArgsSize = ComputeMaxOptionalArgsSize(target, Fn,
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maxOptionalNumArgs);
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staticStackSize = maxOptionalArgsSize
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+ target.getFrameInfo().getMinStackFrameSize();
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}
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int
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MachineFunction::computeOffsetforLocalVar(const TargetMachine& target,
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const Value* val,
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unsigned int& getPaddedSize,
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unsigned int sizeToUse)
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{
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if (sizeToUse == 0)
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sizeToUse = target.findOptimalStorageSize(val->getType());
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unsigned int align = SizeToAlignment(sizeToUse, target);
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bool growUp;
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int firstOffset = target.getFrameInfo().getFirstAutomaticVarOffset(*this,
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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 = target.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
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MachineFunction::allocateLocalVar(const TargetMachine& target,
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const Value* val,
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unsigned int sizeToUse)
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{
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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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int offset = getOffset(val);
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if (offset == INVALID_FRAME_OFFSET)
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{
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unsigned int getPaddedSize;
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offset = computeOffsetforLocalVar(target, val, getPaddedSize, sizeToUse);
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offsets[val] = offset;
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incrementAutomaticVarsSize(getPaddedSize);
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}
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return offset;
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}
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int
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MachineFunction::allocateSpilledValue(const TargetMachine& target,
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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 int size = target.DataLayout.getTypeSize(type);
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unsigned char align = target.DataLayout.getTypeAlignment(type);
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bool growUp;
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int firstOffset = target.getFrameInfo().getRegSpillAreaOffset(*this, growUp);
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int offset = growUp? firstOffset + getRegSpillsSize()
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: firstOffset - (getRegSpillsSize() + size);
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int aligned = target.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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MachineFunction::pushTempValue(const TargetMachine& target,
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unsigned int size)
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{
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unsigned int align = SizeToAlignment(size, target);
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bool growUp;
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int firstOffset = target.getFrameInfo().getTmpAreaOffset(*this, growUp);
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int offset = growUp? firstOffset + currentTmpValuesSize
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: firstOffset - (currentTmpValuesSize + size);
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int aligned = target.getFrameInfo().adjustAlignment(offset, growUp, 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
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MachineFunction::popAllTempValues(const TargetMachine& target)
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{
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resetTmpAreaSize(); // clear tmp area to reuse
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}
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int
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MachineFunction::getOffset(const Value* val) const
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{
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hash_map<const Value*, int>::const_iterator pair = offsets.find(val);
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return (pair == offsets.end()) ? INVALID_FRAME_OFFSET : pair->second;
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}
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void
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MachineFunction::dump() const
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{
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std::cerr << "\n" << Fn->getReturnType()
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<< " \"" << Fn->getName() << "\"\n";
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for (const_iterator BB = begin(); BB != end(); ++BB) {
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std::cerr << "\n" << BB->getBasicBlock()->getName() << " ("
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<< (const void*)BB->getBasicBlock() << ")" << ":" << "\n";
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for (MachineBasicBlock::const_iterator I = BB->begin(); I != BB->end(); ++I)
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std::cerr << "\t" << *I;
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}
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std::cerr << "\nEnd function \"" << Fn->getName() << "\"\n\n";
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}
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