Code pulled out of MAchineInstr.(h|cpp)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1660 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/MachineFunction.cpp

@@ -0,0 +1,300 @@
+//===-- MachineCodeForMethod.cpp --------------------------------------------=//
+// 
+// Purpose:
+//   Collect native machine code information for a method.
+//   This allows target-specific information about the generated code
+//   to be stored with each method.
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/MachineCodeForMethod.h"
+#include "llvm/CodeGen/MachineInstr.h"  // For debug output
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/MachineFrameInfo.h"
+#include "llvm/Target/MachineCacheInfo.h"
+#include "llvm/Method.h"
+#include "llvm/iOther.h"
+#include <limits.h>
+
+const int INVALID_FRAME_OFFSET = INT_MAX; // std::numeric_limits<int>::max();
+
+static AnnotationID MCFM_AID(
+                 AnnotationManager::getID("CodeGen::MachineCodeForMethod"));
+
+// The next two methods are used to construct and to retrieve
+// the MachineCodeForMethod object for the given method.
+// construct() -- Allocates and initializes for a given method and target
+// get()       -- Returns a handle to the object.
+//                This should not be called before "construct()"
+//                for a given Method.
+// 
+MachineCodeForMethod &MachineCodeForMethod::construct(const Method *M,
+                                                      const TargetMachine &Tar){
+  assert(M->getAnnotation(MCFM_AID) == 0 &&
+         "Object already exists for this method!");
+  MachineCodeForMethod* mcInfo = new MachineCodeForMethod(M, Tar);
+  M->addAnnotation(mcInfo);
+  return *mcInfo;
+}
+
+void MachineCodeForMethod::destruct(const Method *M) {
+  bool Deleted = M->deleteAnnotation(MCFM_AID);
+  assert(Deleted && "Machine code did not exist for method!");
+}
+
+
+MachineCodeForMethod &MachineCodeForMethod::get(const Method* method) {
+  MachineCodeForMethod* mc = (MachineCodeForMethod*)
+    method->getAnnotation(MCFM_AID);
+  assert(mc && "Call construct() method first to allocate the object");
+  return *mc;
+}
+
+static unsigned
+ComputeMaxOptionalArgsSize(const TargetMachine& target, const Method* method)
+{
+  const MachineFrameInfo& frameInfo = target.getFrameInfo();
+  
+  unsigned int maxSize = 0;
+  
+  for (Method::const_inst_iterator I=method->inst_begin(),E=method->inst_end();
+       I != E; ++I)
+    if ((*I)->getOpcode() == Instruction::Call)
+      {
+        CallInst* callInst = cast<CallInst>(*I);
+        unsigned int 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.findOptimalStorageSize(callInst->
+                                                    getOperand(i)->getType());
+          }
+        
+        if (maxSize < sizeForThisCall)
+          maxSize = sizeForThisCall;
+      }
+  
+  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, ...).
+//
+// THIS FUNCTION HAS BEEN COPIED FROM EMITASSEMBLY.CPP AND
+// SHOULD BE USED DIRECTLY THERE
+// 
+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)
+        return sz;
+}
+
+
+
+/*ctor*/
+MachineCodeForMethod::MachineCodeForMethod(const Method* _M,
+                                           const TargetMachine& target)
+  : Annotation(MCFM_AID),
+    method(_M), compiledAsLeaf(false), staticStackSize(0),
+    automaticVarsSize(0), regSpillsSize(0),
+    currentOptionalArgsSize(0), maxOptionalArgsSize(0),
+    currentTmpValuesSize(0)
+{
+  maxOptionalArgsSize = ComputeMaxOptionalArgsSize(target, method);
+  staticStackSize = maxOptionalArgsSize +
+                    target.getFrameInfo().getMinStackFrameSize();
+}
+
+int
+MachineCodeForMethod::allocateLocalVar(const TargetMachine& target,
+                                       const Value* val,
+                                       unsigned int size)
+{
+  // Check if we've allocated a stack slot for this value already
+  // 
+  int offset = getOffset(val);
+  if (offset == INVALID_FRAME_OFFSET)
+    {
+      bool growUp;
+      int firstOffset =target.getFrameInfo().getFirstAutomaticVarOffset(*this,
+                                                                       growUp);
+      unsigned char align;
+      if (size == 0)
+        {
+          size  = target.findOptimalStorageSize(val->getType());
+          // align = target.DataLayout.getTypeAlignment(val->getType());
+        }
+      
+      align = SizeToAlignment(size, target);
+          
+      offset = getAutomaticVarsSize();
+      if (! growUp)
+        offset += size; 
+      
+      if (unsigned int mod = offset % align)
+        {
+          offset += align - mod;
+          size   += align - mod;
+        }
+      
+      offset = growUp? firstOffset + offset
+                     : firstOffset - offset;
+      
+      offsets[val] = offset;
+      
+      incrementAutomaticVarsSize(size);
+    }
+  return offset;
+}
+
+int
+MachineCodeForMethod::allocateSpilledValue(const TargetMachine& target,
+                                           const Type* type)
+{
+  unsigned int size  = target.findOptimalStorageSize(type);
+  unsigned char align = target.DataLayout.getTypeAlignment(type);
+  
+  bool growUp;
+  int firstOffset = target.getFrameInfo().getRegSpillAreaOffset(*this, growUp);
+  
+  int offset = getRegSpillsSize();
+  if (! growUp)
+    offset += size; 
+  
+  if (unsigned int mod = offset % align)
+    {
+      offset    += align - mod;
+      size += align - mod;
+    }
+  
+  offset = growUp? firstOffset + offset
+                 : firstOffset - offset;
+  
+  incrementRegSpillsSize(size);
+  
+  return offset;
+}
+
+int
+MachineCodeForMethod::allocateOptionalArg(const TargetMachine& target,
+                                          const Type* type)
+{
+  const MachineFrameInfo& frameInfo = target.getFrameInfo();
+  
+  int size = INT_MAX;
+  if (frameInfo.argsOnStackHaveFixedSize())
+    size = frameInfo.getSizeOfEachArgOnStack(); 
+  else
+    {
+      size = target.findOptimalStorageSize(type);
+      assert(0 && "UNTESTED CODE: Size per stack argument is not fixed on this architecture: use actual argument sizes for computing optional arg offsets");
+    }
+  unsigned char align = target.DataLayout.getTypeAlignment(type);
+  
+  bool growUp;
+  int firstOffset = frameInfo.getFirstOptionalOutgoingArgOffset(*this, growUp);
+  
+  int offset = getCurrentOptionalArgsSize();
+  if (! growUp)
+    offset += size; 
+  
+  if (unsigned int mod = offset % align)
+    {
+      offset += align - mod;
+      size   += align - mod;
+    }
+  
+  offset = growUp? firstOffset + offset
+                 : firstOffset - offset;
+  
+  incrementCurrentOptionalArgsSize(size);
+  
+  return offset;
+}
+
+void
+MachineCodeForMethod::resetOptionalArgs(const TargetMachine& target)
+{
+  currentOptionalArgsSize = 0;
+}
+
+int
+MachineCodeForMethod::pushTempValue(const TargetMachine& target,
+                                    unsigned int size)
+{
+  // Compute a power-of-2 alignment according to the possible sizes,
+  // but not greater than the alignment of the largest type we support
+  // (currently a double word -- see class TargetData).
+  unsigned char align = 1;
+  for (; align < size && align < target.DataLayout.getDoubleAlignment();
+         align = 2*align)
+    ;
+  
+  bool growUp;
+  int firstTmpOffset = target.getFrameInfo().getTmpAreaOffset(*this, growUp);
+  
+  int offset = currentTmpValuesSize;
+  if (! growUp)
+    offset += size; 
+  
+  if (unsigned int mod = offset % align)
+    {
+      offset += align - mod;
+      size   += align - mod;
+    }
+  
+  offset = growUp ? firstTmpOffset + offset : firstTmpOffset - offset;
+  
+  currentTmpValuesSize += size;
+  return offset;
+}
+
+void
+MachineCodeForMethod::popAllTempValues(const TargetMachine& target)
+{
+  currentTmpValuesSize = 0;
+}
+
+int
+MachineCodeForMethod::getOffset(const Value* val) const
+{
+  std::hash_map<const Value*, int>::const_iterator pair = offsets.find(val);
+  return (pair == offsets.end())? INVALID_FRAME_OFFSET : pair->second;
+}
+
+void
+MachineCodeForMethod::dump() const
+{
+  cerr << "\n" << method->getReturnType()
+       << " \"" << method->getName() << "\"\n";
+  
+  for (Method::const_iterator BI = method->begin(); BI != method->end(); ++BI)
+    {
+      BasicBlock* bb = *BI;
+      cerr << "\n"
+	   << (bb->hasName()? bb->getName() : "Label")
+	   << " (" << bb << ")" << ":\n";
+
+      MachineCodeForBasicBlock& mvec = bb->getMachineInstrVec();
+      for (unsigned i=0; i < mvec.size(); i++)
+	cerr << "\t" << *mvec[i];
+    } 
+  cerr << "\nEnd method \"" << method->getName() << "\"\n\n";
+}