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2fbfdcffd3
class. The Method class is obsolete (renamed) and all references to it are being converted over to Function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2144 91177308-0d34-0410-b5e6-96231b3b80d8
321 lines
9.8 KiB
C++
321 lines
9.8 KiB
C++
//===-- MachineCodeForFunction.cpp ------------------------------------------=//
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//
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// Purpose:
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// Collect native machine code information for a function.
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// This allows target-specific information about the generated code
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// to be stored with each function.
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineCodeForMethod.h"
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#include "llvm/CodeGen/MachineInstr.h" // For debug output
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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/BasicBlock.h"
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#include "llvm/iOther.h"
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#include <limits.h>
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#include <iostream>
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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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// 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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MachineCodeForMethod&
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MachineCodeForMethod::construct(const Function *M, const TargetMachine &Tar)
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{
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assert(M->getAnnotation(MCFM_AID) == 0 &&
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"Object already exists for this function!");
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MachineCodeForMethod* mcInfo = new MachineCodeForMethod(M, Tar);
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M->addAnnotation(mcInfo);
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return *mcInfo;
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}
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void
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MachineCodeForMethod::destruct(const Function *M)
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{
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bool Deleted = M->deleteAnnotation(MCFM_AID);
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assert(Deleted && "Machine code did not exist for function!");
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}
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MachineCodeForMethod&
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MachineCodeForMethod::get(const Function *F)
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{
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MachineCodeForMethod *mc = (MachineCodeForMethod*)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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{
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const MachineFrameInfo& frameInfo = target.getFrameInfo();
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unsigned int maxSize = 0;
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for (Function::const_iterator MI = F->begin(), ME = F->end(); MI != ME; ++MI)
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{
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const BasicBlock *BB = *MI;
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for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E; ++I)
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if (CallInst *callInst = dyn_cast<CallInst>(*I))
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{
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unsigned int 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.findOptimalStorageSize(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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}
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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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//
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// THIS FUNCTION HAS BEEN COPIED FROM EMITASSEMBLY.CPP AND
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// SHOULD BE USED DIRECTLY THERE
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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)
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return sz;
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}
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/*ctor*/
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MachineCodeForMethod::MachineCodeForMethod(const Function *F,
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const TargetMachine& target)
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: Annotation(MCFM_AID),
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method(F), compiledAsLeaf(false), staticStackSize(0),
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automaticVarsSize(0), regSpillsSize(0),
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currentOptionalArgsSize(0), maxOptionalArgsSize(0),
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currentTmpValuesSize(0), maxTmpValuesSize(0)
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{
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maxOptionalArgsSize = ComputeMaxOptionalArgsSize(target, method);
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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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MachineCodeForMethod::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 = 0)
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{
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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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unsigned char align;
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if (sizeToUse == 0)
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{
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sizeToUse = target.findOptimalStorageSize(val->getType());
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// align = target.DataLayout.getTypeAlignment(val->getType());
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}
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align = SizeToAlignment(sizeToUse, target);
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int offset = getAutomaticVarsSize();
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if (! growUp)
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offset += sizeToUse;
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if (unsigned int mod = offset % align)
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{
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offset += align - mod;
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getPaddedSize = sizeToUse + align - mod;
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}
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else
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getPaddedSize = sizeToUse;
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offset = growUp? firstOffset + offset
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: firstOffset - offset;
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return offset;
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}
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int
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MachineCodeForMethod::allocateLocalVar(const TargetMachine& target,
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const Value* val,
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unsigned int sizeToUse = 0)
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{
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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 = this->computeOffsetforLocalVar(target, val, getPaddedSize,
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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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MachineCodeForMethod::allocateSpilledValue(const TargetMachine& target,
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const Type* type)
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{
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unsigned int size = target.findOptimalStorageSize(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 = getRegSpillsSize();
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if (! growUp)
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offset += size;
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if (unsigned int mod = offset % align)
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{
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offset += align - mod;
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size += align - mod;
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}
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offset = growUp? firstOffset + offset
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: firstOffset - offset;
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incrementRegSpillsSize(size);
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return offset;
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}
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int
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MachineCodeForMethod::allocateOptionalArg(const TargetMachine& target,
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const Type* type)
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{
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const MachineFrameInfo& frameInfo = target.getFrameInfo();
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int size = INT_MAX;
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if (frameInfo.argsOnStackHaveFixedSize())
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size = frameInfo.getSizeOfEachArgOnStack();
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else
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{
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size = target.findOptimalStorageSize(type);
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assert(0 && "UNTESTED CODE: Size per stack argument is not fixed on this architecture: use actual argument sizes for computing optional arg offsets");
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}
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unsigned char align = target.DataLayout.getTypeAlignment(type);
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bool growUp;
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int firstOffset = frameInfo.getFirstOptionalOutgoingArgOffset(*this, growUp);
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int offset = getCurrentOptionalArgsSize();
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if (! growUp)
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offset += size;
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if (unsigned int mod = offset % align)
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{
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offset += align - mod;
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size += align - mod;
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}
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offset = growUp? firstOffset + offset
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: firstOffset - offset;
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incrementCurrentOptionalArgsSize(size);
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return offset;
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}
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void
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MachineCodeForMethod::resetOptionalArgs(const TargetMachine& target)
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{
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currentOptionalArgsSize = 0;
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}
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int
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MachineCodeForMethod::pushTempValue(const TargetMachine& target,
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unsigned int size)
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{
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// Compute a power-of-2 alignment according to the possible sizes,
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// but not greater than the alignment of the largest type we support
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// (currently a double word -- see class TargetData).
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unsigned char align = 1;
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for (; align < size && align < target.DataLayout.getDoubleAlignment();
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align = 2*align)
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;
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bool growUp;
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int firstTmpOffset = target.getFrameInfo().getTmpAreaOffset(*this, growUp);
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int offset = currentTmpValuesSize;
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if (! growUp)
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offset += size;
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if (unsigned int mod = offset % align)
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{
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offset += align - mod;
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size += align - mod;
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}
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offset = growUp ? firstTmpOffset + offset : firstTmpOffset - offset;
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incrementTmpAreaSize(size);
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return offset;
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}
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void
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MachineCodeForMethod::popAllTempValues(const TargetMachine& target)
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{
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resetTmpAreaSize();
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}
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int
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MachineCodeForMethod::getOffset(const Value* val) const
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{
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std::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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MachineCodeForMethod::dump() const
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{
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std::cerr << "\n" << method->getReturnType()
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<< " \"" << method->getName() << "\"\n";
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for (Function::const_iterator BI = method->begin(); BI != method->end(); ++BI)
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{
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BasicBlock* bb = *BI;
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std::cerr << "\n" << bb->getName() << " (" << bb << ")" << ":\n";
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MachineCodeForBasicBlock& mvec = bb->getMachineInstrVec();
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for (unsigned i=0; i < mvec.size(); i++)
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std::cerr << "\t" << *mvec[i];
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}
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std::cerr << "\nEnd function \"" << method->getName() << "\"\n\n";
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}
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