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Nicolas Geoffray

2008-Apr-07 10:02 UTC

[LLVMdev] Being able to know the jitted code-size before emitting

Hi Evan,

Evan Cheng wrote:>
> I don't think the duplication is going to be top much of a problem. If
> it is, I'll bug you about refactoring. :)
>
>   
I don't mean to show how lazy I can be, but I also need to know the size 
of the exception table emitted in memory (JITDwarfEmitter.cpp). 
Reviewing it a little, I can not see how things won't be duplicated. 
Knowing that I already duplicated code to implement dwarf facilities to 
JIT...

Besides, my implementation is not that slow, you know.  :) It's roughly 
5 times faster than the actual emission of the code. And if someone's 
unhappy with it, then it doesn't have to use it (or code it your way). 
The only downside of my implementation is the virtualization of some 
function calls of MachineCodeEmitter. But that does not really cost much.

So I'm torn between two different approaches. I don't see one of them 
being cleaner than the other one: one duplicates code, one has an unusal 
way to do things. Moreover, if that functionality is integrated into the 
tree, there is little remaining for vmkit to use TOT without patching. 
And I would love to see that as soon as possible.

So are you still strongly against it? Should I stop complaining and 
start writing the functionality the way you suggested it? ;-)

Thx,
Nicolas
> Thanks,
>
> Evan
>
>   
>> Nicolas
>>
>>     
>>> Evan
>>>
>>>
>>>       
>>>>> Suppose you have the size, can't you pass the desired
buffer size
>>>>> to
>>>>> MachineCodeEmitter and have it do the right thing?
>>>>>
>>>>>           
>>>> Sure, that's what I'm doing. The emitter with the
SizeEmitter class
>>>> will
>>>> give the accurate size to the MachineCodeEmitter. And the
>>>> MachineCodeEmitter will emit the instructions in the buffer.
>>>>
>>>> My solution is surely using things in a way that wasn't
intended,
>>>> but it
>>>> works fine and for all targets. Is this really a stopper for
>>>> integrating
>>>> it? (You can see here my laziness on implementing the
>>>> GetFunctionSize to
>>>> every targets :)).
>>>>
>>>> Nicolas
>>>>
>>>>
>>>>         
>>>>> It seems like you
>>>>> can add the functionality to MachineCodeEmitter rather than
add a
>>>>> new
>>>>> class for it.
>>>>>
>>>>> Evan
>>>>>
>>>>>
>>>>>
>>>>>           
>>>>>> Nicolas
>>>>>>
>>>>>>
>>>>>>             
>>>>>>> Thanks,
>>>>>>>
>>>>>>> Evan
>>>>>>>
>>>>>>> On Mar 30, 2008, at 12:05 PM, Nicolas Geoffray
wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>               
>>>>>>>> Hi everyone,
>>>>>>>>
>>>>>>>> vmkit requires to know the size of a jitted
method before
>>>>>>>> emitting
>>>>>>>> the method. This allows to allocate the correct
size for the
>>>>>>>> method.
>>>>>>>> The attached patch creates this functionality
when the flag
>>>>>>>> SizedMemoryCode is on.
>>>>>>>>
>>>>>>>> In order to implement this functionality, i had
to virtualize
>>>>>>>> some
>>>>>>>> MachineCodeEmitter functions.
>>>>>>>>
>>>>>>>> Is it OK to commit the patch?
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>> Nicolas
>>>>>>>> Index: include/llvm/Target/TargetOptions.h
>>>>>>>> >>>>>>>> === 
>>>>>>>>
==============================================================>>>>>>>>
--- include/llvm/Target/TargetOptions.h (revision 48944)
>>>>>>>> +++ include/llvm/Target/TargetOptions.h
(working copy)
>>>>>>>> @@ -74,6 +74,10 @@
>>>>>>>> /// be emitted.
>>>>>>>> extern bool ExceptionHandling;
>>>>>>>>
>>>>>>>> +  /// SizedMemoryCode - This flags indicates
that memory for
>>>>>>>> code
>>>>>>>> is allocated by
>>>>>>>> +  /// an external allocator which requires the
size to allocate
>>>>>>>> +  extern bool SizedMemoryCode;
>>>>>>>> +
>>>>>>>> /// PerformTailCallOpt - This flag is enabled
when -
>>>>>>>> tailcallopt is
>>>>>>>> specified
>>>>>>>> /// on the commandline. When the flag is on,
the target will
>>>>>>>> perform tail call
>>>>>>>> /// optimization (pop the caller's stack)
providing it supports
>>>>>>>> it.
>>>>>>>> Index: include/llvm/CodeGen/SizeEmitter.h
>>>>>>>> >>>>>>>> === 
>>>>>>>>
==============================================================>>>>>>>>
--- include/llvm/CodeGen/SizeEmitter.h    (revision 0)
>>>>>>>> +++ include/llvm/CodeGen/SizeEmitter.h   
(revision 0)
>>>>>>>> @@ -0,0 +1,116 @@
>>>>>>>> +//===-- llvm/CodeGen/MachineCodeEmitter.h -
Code emission
>>>>>>>> -------*-
>>>>>>>> C++ -*-===//
>>>>>>>> +//
>>>>>>>> +//                     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.
>>>>>>>> +//
>>>>>>>> +//
>>>>>>>> >>>>>>>>
>>>>>>>> >>>>>>>> ---
>>>>>>>> --- 
>>>>>>>> --- 
>>>>>>>>
------------------------------------------------------------->>>>>>>>
==//
>>>>>>>> +//
>>>>>>>> +// This file defines an abstract interface
that is used by the
>>>>>>>> machine code
>>>>>>>> +// emission framework to output the code. 
This allows machine
>>>>>>>> code
>>>>>>>> emission to
>>>>>>>> +// be separated from concerns such as
resolution of call
>>>>>>>> targets,
>>>>>>>> and where the
>>>>>>>> +// machine code will be written (memory or
disk, f.e.).
>>>>>>>> +//
>>>>>>>> +//
>>>>>>>> >>>>>>>>
>>>>>>>> >>>>>>>> ---
>>>>>>>> --- 
>>>>>>>> --- 
>>>>>>>>
------------------------------------------------------------->>>>>>>>
==//
>>>>>>>> +
>>>>>>>> +#ifndef LLVM_CODEGEN_SIZEEMITTER_H
>>>>>>>> +#define LLVM_CODEGEN_SIZEEMITTER_H
>>>>>>>> +
>>>>>>>> +#include
"llvm/CodeGen/MachineCodeEmitter.h"
>>>>>>>> +#include
"llvm/CodeGen/MachineFunction.h"
>>>>>>>> +
>>>>>>>> +namespace llvm {
>>>>>>>> +  /// SizeEmitter - The JIT implementation of
the
>>>>>>>> MachineCodeEmitter, which is
>>>>>>>> +  /// used to output functions to memory for
execution.
>>>>>>>> +class SizeEmitter : public MachineCodeEmitter
{
>>>>>>>> +  MachineFunction * Fn;
>>>>>>>> +  void* ConstantPoolBase;
>>>>>>>> +  void* JumpTableBase;
>>>>>>>> +  MachineConstantPool *ConstantPool;
>>>>>>>> +  MachineJumpTableInfo *JumpTable;
>>>>>>>> +  std::vector<intptr_t> LabelLocations;
>>>>>>>> +  MachineCodeEmitter* MCE;
>>>>>>>> +
>>>>>>>> +public:
>>>>>>>> +  SizeEmitter(MachineCodeEmitter* mce) {
>>>>>>>> +    CurBufferPtr = 0;
>>>>>>>> +    BufferBegin = 0;
>>>>>>>> +    BufferEnd = (unsigned char*)-1;
>>>>>>>> +    MCE = mce;
>>>>>>>> +  }
>>>>>>>> +
>>>>>>>> +  SizeEmitter(std::vector<intptr_t>
locations) {
>>>>>>>> +    LabelLocations = locations;
>>>>>>>> +    CurBufferPtr = 0;
>>>>>>>> +    BufferBegin = 0;
>>>>>>>> +    BufferEnd = (unsigned char*)-1;
>>>>>>>> +  }
>>>>>>>> +
>>>>>>>> +  void initConstantPool(MachineConstantPool
*MCP);
>>>>>>>> +
>>>>>>>> +  void initJumpTableInfo(MachineJumpTableInfo
*MJTI);
>>>>>>>> +
>>>>>>>> +
>>>>>>>> +  virtual void startFunction(MachineFunction
&F) {
>>>>>>>> +    CurBufferPtr = 0;
>>>>>>>> +    Fn = &F;
>>>>>>>> +
>>>>>>>> +    // Ensure the constant pool/jump table
info is at least 4-
>>>>>>>> byte
>>>>>>>> aligned.
>>>>>>>> +    emitAlignment(16);
>>>>>>>> +
>>>>>>>> +    initConstantPool(F.getConstantPool());
>>>>>>>> +    initJumpTableInfo(F.getJumpTableInfo());
>>>>>>>> +
>>>>>>>> +    ConstantPoolBase  = (void*)(((uintptr_t)  
>>>>>>>> ConstantPoolBase) +
>>>>>>>> CurBufferPtr);
>>>>>>>> +    JumpTableBase     = (void*)(((uintptr_t)
JumpTableBase) +
>>>>>>>> CurBufferPtr);
>>>>>>>> +  }
>>>>>>>> +
>>>>>>>> +  virtual bool finishFunction(MachineFunction
&F) {
>>>>>>>> +    MCE->setCurrentPtr(CurBufferPtr);
>>>>>>>> +    return false;
>>>>>>>> +  }
>>>>>>>> +  virtual void startFunctionStub(unsigned
StubSize, unsigned
>>>>>>>> Alignment) {}
>>>>>>>> +  virtual void *finishFunctionStub(const
Function *F) { return
>>>>>>>> 0; }
>>>>>>>> +  virtual void addRelocation(const
llvm::MachineRelocation&)
>>>>>>>> { }
>>>>>>>> +  virtual void emitByte(unsigned char B) {
>>>>>>>> +    CurBufferPtr++;
>>>>>>>> +  }
>>>>>>>> +  virtual void emitWordLE(unsigned W) {
>>>>>>>> +    CurBufferPtr+=4;
>>>>>>>> +  }
>>>>>>>> +  virtual void emitWordBE(unsigned W) {
>>>>>>>> +    CurBufferPtr+=4;
>>>>>>>> +  }
>>>>>>>> +  virtual void emitInt32(int Value) {
>>>>>>>> +    CurBufferPtr += 4;
>>>>>>>> +  }
>>>>>>>> +  virtual void emitInt64(uint64_t Value) {
>>>>>>>> +    CurBufferPtr += 8;
>>>>>>>> +  }
>>>>>>>> +  virtual void emitAt(uintptr_t *Addr,
uintptr_t Value) {
>>>>>>>> +  }
>>>>>>>> +
>>>>>>>> +
>>>>>>>> +
>>>>>>>> +  virtual void
StartMachineBasicBlock(MachineBasicBlock *MBB)
>>>>>>>> {}
>>>>>>>> +  virtual intptr_t
getConstantPoolEntryAddress(unsigned
>>>>>>>> ConstantNum) const;
>>>>>>>> +
>>>>>>>> +  virtual intptr_t
getJumpTableEntryAddress(unsigned Index)
>>>>>>>> const;
>>>>>>>> +
>>>>>>>> +  virtual intptr_t getMachineBasicBlockAddress
>>>>>>>> (MachineBasicBlock
>>>>>>>> *MBB) const {
>>>>>>>> +    assert(0 && "Should not be in
getMachineBasicBlockAddress
>>>>>>>> of
>>>>>>>> SizeEmitter");
>>>>>>>> +  }
>>>>>>>> +
>>>>>>>> +  virtual void emitLabel(uint64_t) {}
>>>>>>>> +  virtual intptr_t getLabelAddress(uint64_t
LabelID) const {
>>>>>>>> +    assert(LabelLocations.size() >
(unsigned)LabelID &&
>>>>>>>> +             LabelLocations[LabelID]
&& "Label not emitted!");
>>>>>>>> +      return LabelLocations[LabelID];
>>>>>>>> +  }
>>>>>>>> +  virtual void
setModuleInfo(llvm::MachineModuleInfo*) {}
>>>>>>>> +};
>>>>>>>> +
>>>>>>>> +} // end llvm namespace
>>>>>>>> +
>>>>>>>> +#endif
>>>>>>>> Index:
include/llvm/CodeGen/MachineCodeEmitter.h
>>>>>>>> >>>>>>>> === 
>>>>>>>>
==============================================================>>>>>>>>
--- include/llvm/CodeGen/MachineCodeEmitter.h    (revision
>>>>>>>> 48143)
>>>>>>>> +++ include/llvm/CodeGen/MachineCodeEmitter.h  
(working copy)
>>>>>>>> @@ -18,6 +18,7 @@
>>>>>>>> #define LLVM_CODEGEN_MACHINECODEEMITTER_H
>>>>>>>>
>>>>>>>> #include "llvm/Support/DataTypes.h"
>>>>>>>> +#include <string>
>>>>>>>> #include <vector>
>>>>>>>>
>>>>>>>> namespace llvm {
>>>>>>>> @@ -92,7 +93,7 @@
>>>>>>>> /// emitByte - This callback is invoked when a
byte needs to be
>>>>>>>> written to the
>>>>>>>> /// output stream.
>>>>>>>> ///
>>>>>>>> -  void emitByte(unsigned char B) {
>>>>>>>> +  virtual void emitByte(unsigned char B) {
>>>>>>>>  if (CurBufferPtr != BufferEnd)
>>>>>>>>    *CurBufferPtr++ = B;
>>>>>>>> }
>>>>>>>> @@ -100,7 +101,7 @@
>>>>>>>> /// emitWordLE - This callback is invoked when
a 32-bit word
>>>>>>>> needs
>>>>>>>> to be
>>>>>>>> /// written to the output stream in
little-endian format.
>>>>>>>> ///
>>>>>>>> -  void emitWordLE(unsigned W) {
>>>>>>>> +  virtual void emitWordLE(unsigned W) {
>>>>>>>>  if (CurBufferPtr+4 <= BufferEnd) {
>>>>>>>>    *CurBufferPtr++ = (unsigned char)(W >>
0);
>>>>>>>>    *CurBufferPtr++ = (unsigned char)(W >>
8);
>>>>>>>> @@ -114,7 +115,7 @@
>>>>>>>> /// emitWordBE - This callback is invoked when
a 32-bit word
>>>>>>>> needs
>>>>>>>> to be
>>>>>>>> /// written to the output stream in big-endian
format.
>>>>>>>> ///
>>>>>>>> -  void emitWordBE(unsigned W) {
>>>>>>>> +  virtual void emitWordBE(unsigned W) {
>>>>>>>>  if (CurBufferPtr+4 <= BufferEnd) {
>>>>>>>>    *CurBufferPtr++ = (unsigned char)(W >>
24);
>>>>>>>>    *CurBufferPtr++ = (unsigned char)(W >>
16);
>>>>>>>> @@ -175,7 +176,7 @@
>>>>>>>> }
>>>>>>>>
>>>>>>>> /// emitInt32 - Emit a int32 directive.
>>>>>>>> -  void emitInt32(int Value) {
>>>>>>>> +  virtual void emitInt32(int Value) {
>>>>>>>>  if (CurBufferPtr+4 <= BufferEnd) {
>>>>>>>>    *((uint32_t*)CurBufferPtr) = Value;
>>>>>>>>    CurBufferPtr += 4;
>>>>>>>> @@ -185,7 +186,7 @@
>>>>>>>> }
>>>>>>>>
>>>>>>>> /// emitInt64 - Emit a int64 directive.
>>>>>>>> -  void emitInt64(uint64_t Value) {
>>>>>>>> +  virtual void emitInt64(uint64_t Value) {
>>>>>>>>  if (CurBufferPtr+8 <= BufferEnd) {
>>>>>>>>    *((uint64_t*)CurBufferPtr) = Value;
>>>>>>>>    CurBufferPtr += 8;
>>>>>>>> @@ -195,7 +196,7 @@
>>>>>>>> }
>>>>>>>>
>>>>>>>> /// emitAt - Emit Value in Addr
>>>>>>>> -  void emitAt(uintptr_t *Addr, uintptr_t
Value) {
>>>>>>>> +  virtual void emitAt(uintptr_t *Addr,
uintptr_t Value) {
>>>>>>>>  if (Addr >= (uintptr_t*)BufferBegin
&& Addr <
>>>>>>>> (uintptr_t*)BufferEnd)
>>>>>>>>    (*Addr) = Value;
>>>>>>>> }
>>>>>>>> @@ -270,6 +271,11 @@
>>>>>>>> /// Specifies the MachineModuleInfo object.
This is used for
>>>>>>>> exception handling
>>>>>>>> /// purposes.
>>>>>>>> virtual void setModuleInfo(MachineModuleInfo*
Info) = 0;
>>>>>>>> +
>>>>>>>> +  void setCurrentPtr(unsigned char* Ptr) {
>>>>>>>> +    CurBufferPtr = Ptr;
>>>>>>>> +  }
>>>>>>>> +
>>>>>>>> };
>>>>>>>>
>>>>>>>> } // End llvm namespace
>>>>>>>> Index: lib/CodeGen/LLVMTargetMachine.cpp
>>>>>>>> >>>>>>>> === 
>>>>>>>>
==============================================================>>>>>>>>
--- lib/CodeGen/LLVMTargetMachine.cpp    (revision 48143)
>>>>>>>> +++ lib/CodeGen/LLVMTargetMachine.cpp   
(working copy)
>>>>>>>> @@ -17,6 +17,7 @@
>>>>>>>> #include
"llvm/Assembly/PrintModulePass.h"
>>>>>>>> #include "llvm/Analysis/LoopPass.h"
>>>>>>>> #include "llvm/CodeGen/Passes.h"
>>>>>>>> +#include
"llvm/CodeGen/SizeEmitter.h"
>>>>>>>> #include "llvm/CodeGen/Collector.h"
>>>>>>>> #include
"llvm/Target/TargetOptions.h"
>>>>>>>> #include "llvm/Transforms/Scalar.h"
>>>>>>>> @@ -257,7 +258,13 @@
>>>>>>>>
>>>>>>>> if (addPreEmitPass(PM, Fast) &&
PrintMachineCode)
>>>>>>>> 
PM.add(createMachineFunctionPrinterPass(cerr));
>>>>>>>> +
>>>>>>>> +  if (SizedMemoryCode) {
>>>>>>>> +    SizeEmitter * SE = new
SizeEmitter(&MCE);
>>>>>>>> +    addSimpleCodeEmitter(PM, Fast, false,
*SE);
>>>>>>>> +  }
>>>>>>>>
>>>>>>>> +
>>>>>>>> addCodeEmitter(PM, Fast, PrintEmittedAsm, MCE);
>>>>>>>>
>>>>>>>> PM.add(createCollectorMetadataDeleter());
>>>>>>>> Index: lib/CodeGen/SizeEmitter.cpp
>>>>>>>> >>>>>>>> === 
>>>>>>>>
==============================================================>>>>>>>>
--- lib/CodeGen/SizeEmitter.cpp    (revision 0)
>>>>>>>> +++ lib/CodeGen/SizeEmitter.cpp    (revision 0)
>>>>>>>> @@ -0,0 +1,77 @@
>>>>>>>> +#include
"llvm/CodeGen/SizeEmitter.h"
>>>>>>>> +#include "llvm/Constant.h"
>>>>>>>> +#include "llvm/Constants.h"
>>>>>>>> +#include "llvm/DerivedTypes.h"
>>>>>>>> +#include "llvm/Module.h"
>>>>>>>> +#include "llvm/Type.h"
>>>>>>>> +#include
"llvm/CodeGen/MachineCodeEmitter.h"
>>>>>>>> +#include
"llvm/CodeGen/MachineFunction.h"
>>>>>>>> +#include
"llvm/CodeGen/MachineConstantPool.h"
>>>>>>>> +#include
"llvm/CodeGen/MachineJumpTableInfo.h"
>>>>>>>> +#include
"llvm/CodeGen/MachineRelocation.h"
>>>>>>>> +#include
"llvm/ExecutionEngine/GenericValue.h"
>>>>>>>> +#include "llvm/Target/TargetData.h"
>>>>>>>> +#include
"llvm/Target/TargetJITInfo.h"
>>>>>>>> +#include
"llvm/Target/TargetMachine.h"
>>>>>>>> +#include
"llvm/Target/TargetOptions.h"
>>>>>>>> +#include "llvm/Support/Debug.h"
>>>>>>>> +#include "llvm/Support/MutexGuard.h"
>>>>>>>> +#include
"llvm/System/Disassembler.h"
>>>>>>>> +#include "llvm/ADT/Statistic.h"
>>>>>>>> +#include "llvm/System/Memory.h"
>>>>>>>> +#include <algorithm>
>>>>>>>> +using namespace llvm;
>>>>>>>> +
>>>>>>>> +
>>>>>>>> +void
SizeEmitter::initConstantPool(MachineConstantPool *MCP) {
>>>>>>>> +  const
std::vector<MachineConstantPoolEntry> &Constants = MCP-
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> getConstants();
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> +  if (Constants.empty()) return;
>>>>>>>> +
>>>>>>>> +  MachineConstantPoolEntry CPE =
Constants.back();
>>>>>>>> +  unsigned Size = CPE.Offset;
>>>>>>>> +  const Type *Ty =
CPE.isMachineConstantPoolEntry()
>>>>>>>> +    ? CPE.Val.MachineCPVal->getType() :
CPE.Val.ConstVal-
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> getType();
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> +  Size +=
Fn->getTarget().getTargetData()->getABITypeSize(Ty);
>>>>>>>> +  ConstantPoolBase = allocateSpace(Size, 1
<< MCP-
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> getConstantPoolAlignment());
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> +  ConstantPool = MCP;
>>>>>>>> +}
>>>>>>>> +
>>>>>>>> +void
SizeEmitter::initJumpTableInfo(MachineJumpTableInfo
>>>>>>>> *MJTI) {
>>>>>>>> +  const
std::vector<MachineJumpTableEntry> &JT = MJTI-
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> getJumpTables();
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> +  if (JT.empty()) return;
>>>>>>>> +
>>>>>>>> +  unsigned NumEntries = 0;
>>>>>>>> +  for (unsigned i = 0, e = JT.size(); i != e;
++i)
>>>>>>>> +    NumEntries += JT[i].MBBs.size();
>>>>>>>> +
>>>>>>>> +  unsigned EntrySize =
MJTI->getEntrySize();
>>>>>>>> +
>>>>>>>> +  // Just allocate space for all the jump
tables now.  We will
>>>>>>>> fix
>>>>>>>> up the actual
>>>>>>>> +  // MBB entries in the tables after we emit
the code for each
>>>>>>>> block, since then
>>>>>>>> +  // we will know the final locations of the
MBBs in memory.
>>>>>>>> +  JumpTable = MJTI;
>>>>>>>> +  JumpTableBase = allocateSpace(NumEntries *
EntrySize, MJTI-
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> getAlignment());
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> +}
>>>>>>>> +
>>>>>>>> +intptr_t
SizeEmitter::getConstantPoolEntryAddress(unsigned
>>>>>>>> ConstantNum) const {
>>>>>>>> +  assert(ConstantNum <
ConstantPool->getConstants().size() &&
>>>>>>>> +         "Invalid
ConstantPoolIndex!");
>>>>>>>> +  return (intptr_t)ConstantPoolBase +
>>>>>>>> +        
ConstantPool->getConstants()[ConstantNum].Offset;
>>>>>>>> +}
>>>>>>>> +
>>>>>>>> +intptr_t
SizeEmitter::getJumpTableEntryAddress(unsigned Index)
>>>>>>>> const {
>>>>>>>> +  const
std::vector<MachineJumpTableEntry> &JT = JumpTable-
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> getJumpTables();
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> +  assert(Index < JT.size() &&
"Invalid jump table index!");
>>>>>>>> +
>>>>>>>> +  unsigned Offset = 0;
>>>>>>>> +  unsigned EntrySize =
JumpTable->getEntrySize();
>>>>>>>> +
>>>>>>>> +  for (unsigned i = 0; i < Index; ++i)
>>>>>>>> +    Offset += JT[i].MBBs.size();
>>>>>>>> +
>>>>>>>> +   Offset *= EntrySize;
>>>>>>>> +
>>>>>>>> +  return (intptr_t)((char *)JumpTableBase +
Offset);
>>>>>>>> +}
>>>>>>>> +
>>>>>>>> Index: lib/Target/TargetMachine.cpp
>>>>>>>> >>>>>>>> === 
>>>>>>>>
==============================================================>>>>>>>>
--- lib/Target/TargetMachine.cpp (revision 48143)
>>>>>>>> +++ lib/Target/TargetMachine.cpp (working copy)
>>>>>>>> @@ -31,6 +31,7 @@
>>>>>>>> bool UseSoftFloat;
>>>>>>>> bool NoZerosInBSS;
>>>>>>>> bool ExceptionHandling;
>>>>>>>> +  bool SizedMemoryCode;
>>>>>>>> Reloc::Model RelocationModel;
>>>>>>>> CodeModel::Model CMModel;
>>>>>>>> bool PerformTailCallOpt;
>>>>>>>> Index: lib/ExecutionEngine/JIT/JITEmitter.cpp
>>>>>>>> >>>>>>>> === 
>>>>>>>>
==============================================================>>>>>>>>
--- lib/ExecutionEngine/JIT/JITEmitter.cpp    (revision 48143)
>>>>>>>> +++ lib/ExecutionEngine/JIT/JITEmitter.cpp   
(working copy)
>>>>>>>> @@ -18,12 +18,14 @@
>>>>>>>> #include "llvm/Constant.h"
>>>>>>>> #include "llvm/Module.h"
>>>>>>>> #include "llvm/Type.h"
>>>>>>>> +#include "llvm/ADT/DenseMap.h"
>>>>>>>> #include
"llvm/CodeGen/MachineCodeEmitter.h"
>>>>>>>> #include
"llvm/CodeGen/MachineFunction.h"
>>>>>>>> #include
"llvm/CodeGen/MachineConstantPool.h"
>>>>>>>> #include
"llvm/CodeGen/MachineJumpTableInfo.h"
>>>>>>>> #include
"llvm/CodeGen/MachineModuleInfo.h"
>>>>>>>> #include
"llvm/CodeGen/MachineRelocation.h"
>>>>>>>> +#include
"llvm/CodeGen/SizeEmitter.h"
>>>>>>>> #include
"llvm/ExecutionEngine/JITMemoryManager.h"
>>>>>>>> #include "llvm/Target/TargetData.h"
>>>>>>>> #include
"llvm/Target/TargetJITInfo.h"
>>>>>>>> @@ -370,6 +376,7 @@
>>>>>>>>  virtual void startFunction(MachineFunction
&F);
>>>>>>>>  virtual bool finishFunction(MachineFunction
&F);
>>>>>>>>
>>>>>>>> +    void initConstantPool(MachineConstantPool
*MCP);
>>>>>>>>  void emitConstantPool(MachineConstantPool
*MCP);
>>>>>>>>  void initJumpTableInfo(MachineJumpTableInfo
*MJTI);
>>>>>>>>  void emitJumpTableInfo(MachineJumpTableInfo
*MJTI);
>>>>>>>> @@ -469,19 +476,47 @@
>>>>>>>>
>>>>>>>>
>>>>>>>> void JITEmitter::startFunction(MachineFunction
&F) {
>>>>>>>> -  uintptr_t ActualSize;
>>>>>>>> -  BufferBegin = CurBufferPtr = MemMgr-
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> startFunctionBody(F.getFunction(),
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> -
>>>>>>>> ActualSize);
>>>>>>>> -  BufferEnd = BufferBegin+ActualSize;
>>>>>>>> +  MMI->BeginFunction(&F);
>>>>>>>>
>>>>>>>> -  // Ensure the constant pool/jump table info
is at least 4-
>>>>>>>> byte
>>>>>>>> aligned.
>>>>>>>> -  emitAlignment(16);
>>>>>>>> +  if (SizedMemoryCode) {
>>>>>>>> +    BufferBegin = CurBufferPtr;
>>>>>>>> +    BufferEnd = (unsigned char*) 0xffffffff;
>>>>>>>> +
>>>>>>>> +    // Ensure the constant pool/jump table
info is at least 4-
>>>>>>>> byte
>>>>>>>> aligned.
>>>>>>>> +    emitAlignment(16);
>>>>>>>>
>>>>>>>> -  emitConstantPool(F.getConstantPool());
>>>>>>>> -  initJumpTableInfo(F.getJumpTableInfo());
>>>>>>>> +    initConstantPool(F.getConstantPool());
>>>>>>>> +    initJumpTableInfo(F.getJumpTableInfo());
>>>>>>>> +
>>>>>>>> +
>>>>>>>> +    uintptr_t ActualSize =
(uintptr_t)CurBufferPtr;
>>>>>>>> +    CurBufferPtr =
MemMgr->startFunctionBody(F.getFunction(),
>>>>>>>> +                                            
ActualSize);
>>>>>>>> +
>>>>>>>> +    ConstantPoolBase  = (void*)(((unsigned)
ConstantPoolBase) +
>>>>>>>> CurBufferPtr);
>>>>>>>> +    JumpTableBase     = (void*)(((unsigned)
JumpTableBase) +
>>>>>>>> CurBufferPtr);
>>>>>>>>
>>>>>>>> -  // About to start emitting the machine code
for the function.
>>>>>>>> - 
emitAlignment(std::max(F.getFunction()->getAlignment(), 8U));
>>>>>>>> +    emitConstantPool(F.getConstantPool());
>>>>>>>> +
>>>>>>>> +  } else {
>>>>>>>> +    uintptr_t ActualSize;
>>>>>>>> +    BufferBegin = CurBufferPtr = MemMgr-
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> startFunctionBody(F.getFunction(),
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> +
>>>>>>>> ActualSize);
>>>>>>>> +    BufferEnd = BufferBegin+ActualSize;
>>>>>>>> +
>>>>>>>> +    // Ensure the constant pool/jump table
info is at least 4-
>>>>>>>> byte
>>>>>>>> aligned.
>>>>>>>> +    emitAlignment(16);
>>>>>>>> +
>>>>>>>> +    initConstantPool(F.getConstantPool());
>>>>>>>> +    emitConstantPool(F.getConstantPool());
>>>>>>>> +    initJumpTableInfo(F.getJumpTableInfo());
>>>>>>>> +
>>>>>>>> +    // About to start emitting the machine
code for the
>>>>>>>> function.
>>>>>>>> +   
emitAlignment(std::max(F.getFunction()->getAlignment(),
>>>>>>>> 8U));
>>>>>>>> +
>>>>>>>> +  }
>>>>>>>> +
>>>>>>>> +
>>>>>>>> TheJIT->updateGlobalMapping(F.getFunction(),
CurBufferPtr);
>>>>>>>>
>>>>>>>> MBBLocations.clear();
>>>>>>>> @@ -579,12 +614,18 @@
>>>>>>>>  DOUT << "Disassembled code:\n"
>>>>>>>>       << sys::disassembleBuffer(FnStart,
FnEnd-FnStart,
>>>>>>>> (uintptr_t)FnStart);
>>>>>>>> #endif
>>>>>>>> +
>>>>>>>> if (ExceptionHandling) {
>>>>>>>>  uintptr_t ActualSize;
>>>>>>>> +    if (SizedMemoryCode) {
>>>>>>>> +      SizeEmitter sz(LabelLocations);
>>>>>>>> +      DE->EmitDwarfTable(F, sz, FnStart,
FnEnd);
>>>>>>>> +      ActualSize = sz.getCurrentPCValue();
>>>>>>>> +    }
>>>>>>>>  SavedBufferBegin = BufferBegin;
>>>>>>>>  SavedBufferEnd = BufferEnd;
>>>>>>>>  SavedCurBufferPtr = CurBufferPtr;
>>>>>>>> -
>>>>>>>> +
>>>>>>>>  BufferBegin = CurBufferPtr = MemMgr-
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> startExceptionTable(F.getFunction(),
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> ActualSize);
>>>>>>>>  BufferEnd = BufferBegin+ActualSize;
>>>>>>>> @@ -598,11 +639,10 @@
>>>>>>>>  TheJIT->RegisterTable(FrameRegister);
>>>>>>>> }
>>>>>>>> MMI->EndFunction();
>>>>>>>> -
>>>>>>>> return false;
>>>>>>>> }
>>>>>>>>
>>>>>>>> -void
JITEmitter::emitConstantPool(MachineConstantPool *MCP) {
>>>>>>>> +void
JITEmitter::initConstantPool(MachineConstantPool *MCP) {
>>>>>>>> const
std::vector<MachineConstantPoolEntry> &Constants = MCP-
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> getConstants();
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> if (Constants.empty()) return;
>>>>>>>>
>>>>>>>> @@ -611,12 +651,15 @@
>>>>>>>> const Type *Ty =
CPE.isMachineConstantPoolEntry()
>>>>>>>>  ? CPE.Val.MachineCPVal->getType() :
CPE.Val.ConstVal->getType
>>>>>>>> ();
>>>>>>>> Size +=
TheJIT->getTargetData()->getABITypeSize(Ty);
>>>>>>>> -
>>>>>>>> +
>>>>>>>> ConstantPoolBase = allocateSpace(Size, 1
<< MCP-
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> getConstantPoolAlignment());
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> ConstantPool = MCP;
>>>>>>>> +}
>>>>>>>>
>>>>>>>> +void
JITEmitter::emitConstantPool(MachineConstantPool *MCP) {
>>>>>>>> if (ConstantPoolBase == 0) return;  // Buffer
overflow.
>>>>>>>>
>>>>>>>> +  const
std::vector<MachineConstantPoolEntry> &Constants = MCP-
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> getConstants();
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> // Initialize the memory for all of the
constant pool entries.
>>>>>>>> for (unsigned i = 0, e = Constants.size(); i !=
e; ++i) {
>>>>>>>>  void *CAddr =
(char*)ConstantPoolBase+Constants[i].Offset;
>>>>>>>> _______________________________________________
>>>>>>>> LLVM Developers mailing list
>>>>>>>> LLVMdev at cs.uiuc.edu        
http://llvm.cs.uiuc.edu
>>>>>>>>
http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>> _______________________________________________
>>>>>>> LLVM Developers mailing list
>>>>>>> LLVMdev at cs.uiuc.edu        
http://llvm.cs.uiuc.edu
>>>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>               
>>>>>> _______________________________________________
>>>>>> LLVM Developers mailing list
>>>>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>>
>>>>>>
>>>>>>             
>>>>> _______________________________________________
>>>>> LLVM Developers mailing list
>>>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>
>>>>>
>>>>>           
>>>> _______________________________________________
>>>> LLVM Developers mailing list
>>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>
>>>>         
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>
>>>       
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>     
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>

Evan Cheng

2008-Apr-07 16:20 UTC

head link

[LLVMdev] Being able to know the jitted code-size before emitting

On Apr 7, 2008, at 3:02 AM, Nicolas Geoffray wrote:
> Hi Evan,
>
> Evan Cheng wrote:
>>
>> I don't think the duplication is going to be top much of a problem.
>> If
>> it is, I'll bug you about refactoring. :)
>>
>>
>
> I don't mean to show how lazy I can be, but I also need to know the  
> size
> of the exception table emitted in memory (JITDwarfEmitter.cpp).
> Reviewing it a little, I can not see how things won't be duplicated.
> Knowing that I already duplicated code to implement dwarf facilities  
> to
> JIT...
>
> Besides, my implementation is not that slow, you know.  :) It's  
> roughly
> 5 times faster than the actual emission of the code. And if someone's
> unhappy with it, then it doesn't have to use it (or code it your way).
> The only downside of my implementation is the virtualization of some
> function calls of MachineCodeEmitter. But that does not really cost  
> much.
>
> So I'm torn between two different approaches. I don't see one of
them
> being cleaner than the other one: one duplicates code, one has an  
> unusal
> way to do things. Moreover, if that functionality is integrated into  
> the
> tree, there is little remaining for vmkit to use TOT without patching.
> And I would love to see that as soon as possible.
>
> So are you still strongly against it? Should I stop complaining and
> start writing the functionality the way you suggested it? ;-)
Yeah, sorry I'm stubborn sometimes. :-) And really I think adding the  
code size functionality is not really that complicated. I would be  
happy to help if you run into issues.

Thanks.

Evan
>
>
> Thx,
> Nicolas
>
>> Thanks,
>>
>> Evan
>>
>>
>>> Nicolas
>>>
>>>
>>>> Evan
>>>>
>>>>
>>>>
>>>>>> Suppose you have the size, can't you pass the
desired buffer size
>>>>>> to
>>>>>> MachineCodeEmitter and have it do the right thing?
>>>>>>
>>>>>>
>>>>> Sure, that's what I'm doing. The emitter with the
SizeEmitter
>>>>> class
>>>>> will
>>>>> give the accurate size to the MachineCodeEmitter. And the
>>>>> MachineCodeEmitter will emit the instructions in the
buffer.
>>>>>
>>>>> My solution is surely using things in a way that wasn't
intended,
>>>>> but it
>>>>> works fine and for all targets. Is this really a stopper
for
>>>>> integrating
>>>>> it? (You can see here my laziness on implementing the
>>>>> GetFunctionSize to
>>>>> every targets :)).
>>>>>
>>>>> Nicolas
>>>>>
>>>>>
>>>>>
>>>>>> It seems like you
>>>>>> can add the functionality to MachineCodeEmitter rather
than add a
>>>>>> new
>>>>>> class for it.
>>>>>>
>>>>>> Evan
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>> Nicolas
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> Thanks,
>>>>>>>>
>>>>>>>> Evan
>>>>>>>>
>>>>>>>> On Mar 30, 2008, at 12:05 PM, Nicolas Geoffray
wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>> Hi everyone,
>>>>>>>>>
>>>>>>>>> vmkit requires to know the size of a jitted
method before
>>>>>>>>> emitting
>>>>>>>>> the method. This allows to allocate the
correct size for the
>>>>>>>>> method.
>>>>>>>>> The attached patch creates this
functionality when the flag
>>>>>>>>> SizedMemoryCode is on.
>>>>>>>>>
>>>>>>>>> In order to implement this functionality, i
had to virtualize
>>>>>>>>> some
>>>>>>>>> MachineCodeEmitter functions.
>>>>>>>>>
>>>>>>>>> Is it OK to commit the patch?
>>>>>>>>>
>>>>>>>>> Thanks,
>>>>>>>>> Nicolas
>>>>>>>>> Index: include/llvm/Target/TargetOptions.h
>>>>>>>>> >>>>>>>>>
==>>>>>>>>> =
>>>>>>>>>
=============================================================>>>>>>>>>
--- include/llvm/Target/TargetOptions.h (revision 48944)
>>>>>>>>> +++ include/llvm/Target/TargetOptions.h
(working copy)
>>>>>>>>> @@ -74,6 +74,10 @@
>>>>>>>>> /// be emitted.
>>>>>>>>> extern bool ExceptionHandling;
>>>>>>>>>
>>>>>>>>> +  /// SizedMemoryCode - This flags
indicates that memory for
>>>>>>>>> code
>>>>>>>>> is allocated by
>>>>>>>>> +  /// an external allocator which requires
the size to
>>>>>>>>> allocate
>>>>>>>>> +  extern bool SizedMemoryCode;
>>>>>>>>> +
>>>>>>>>> /// PerformTailCallOpt - This flag is
enabled when -
>>>>>>>>> tailcallopt is
>>>>>>>>> specified
>>>>>>>>> /// on the commandline. When the flag is
on, the target will
>>>>>>>>> perform tail call
>>>>>>>>> /// optimization (pop the caller's
stack) providing it
>>>>>>>>> supports
>>>>>>>>> it.
>>>>>>>>> Index: include/llvm/CodeGen/SizeEmitter.h
>>>>>>>>> >>>>>>>>>
==>>>>>>>>> =
>>>>>>>>>
=============================================================>>>>>>>>>
--- include/llvm/CodeGen/SizeEmitter.h    (revision 0)
>>>>>>>>> +++ include/llvm/CodeGen/SizeEmitter.h   
(revision 0)
>>>>>>>>> @@ -0,0 +1,116 @@
>>>>>>>>> +//===-- llvm/CodeGen/MachineCodeEmitter.h
- Code emission
>>>>>>>>> -------*-
>>>>>>>>> C++ -*-===//
>>>>>>>>> +//
>>>>>>>>> +//                     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.
>>>>>>>>> +//
>>>>>>>>> +//
>>>>>>>>> >>>>>>>>>
>>>>>>>>> >>>>>>>>> ---
>>>>>>>>> ---
>>>>>>>>> ---
>>>>>>>>>
------------------------------------------------------------->>>>>>>>>
==//
>>>>>>>>> +//
>>>>>>>>> +// This file defines an abstract interface
that is used by
>>>>>>>>> the
>>>>>>>>> machine code
>>>>>>>>> +// emission framework to output the code. 
This allows
>>>>>>>>> machine
>>>>>>>>> code
>>>>>>>>> emission to
>>>>>>>>> +// be separated from concerns such as
resolution of call
>>>>>>>>> targets,
>>>>>>>>> and where the
>>>>>>>>> +// machine code will be written (memory or
disk, f.e.).
>>>>>>>>> +//
>>>>>>>>> +//
>>>>>>>>> >>>>>>>>>
>>>>>>>>> >>>>>>>>> ---
>>>>>>>>> ---
>>>>>>>>> ---
>>>>>>>>>
------------------------------------------------------------->>>>>>>>>
==//
>>>>>>>>> +
>>>>>>>>> +#ifndef LLVM_CODEGEN_SIZEEMITTER_H
>>>>>>>>> +#define LLVM_CODEGEN_SIZEEMITTER_H
>>>>>>>>> +
>>>>>>>>> +#include
"llvm/CodeGen/MachineCodeEmitter.h"
>>>>>>>>> +#include
"llvm/CodeGen/MachineFunction.h"
>>>>>>>>> +
>>>>>>>>> +namespace llvm {
>>>>>>>>> +  /// SizeEmitter - The JIT implementation
of the
>>>>>>>>> MachineCodeEmitter, which is
>>>>>>>>> +  /// used to output functions to memory
for execution.
>>>>>>>>> +class SizeEmitter : public
MachineCodeEmitter {
>>>>>>>>> +  MachineFunction * Fn;
>>>>>>>>> +  void* ConstantPoolBase;
>>>>>>>>> +  void* JumpTableBase;
>>>>>>>>> +  MachineConstantPool *ConstantPool;
>>>>>>>>> +  MachineJumpTableInfo *JumpTable;
>>>>>>>>> +  std::vector<intptr_t>
LabelLocations;
>>>>>>>>> +  MachineCodeEmitter* MCE;
>>>>>>>>> +
>>>>>>>>> +public:
>>>>>>>>> +  SizeEmitter(MachineCodeEmitter* mce) {
>>>>>>>>> +    CurBufferPtr = 0;
>>>>>>>>> +    BufferBegin = 0;
>>>>>>>>> +    BufferEnd = (unsigned char*)-1;
>>>>>>>>> +    MCE = mce;
>>>>>>>>> +  }
>>>>>>>>> +
>>>>>>>>> +  SizeEmitter(std::vector<intptr_t>
locations) {
>>>>>>>>> +    LabelLocations = locations;
>>>>>>>>> +    CurBufferPtr = 0;
>>>>>>>>> +    BufferBegin = 0;
>>>>>>>>> +    BufferEnd = (unsigned char*)-1;
>>>>>>>>> +  }
>>>>>>>>> +
>>>>>>>>> +  void
initConstantPool(MachineConstantPool *MCP);
>>>>>>>>> +
>>>>>>>>> +  void
initJumpTableInfo(MachineJumpTableInfo *MJTI);
>>>>>>>>> +
>>>>>>>>> +
>>>>>>>>> +  virtual void
startFunction(MachineFunction &F) {
>>>>>>>>> +    CurBufferPtr = 0;
>>>>>>>>> +    Fn = &F;
>>>>>>>>> +
>>>>>>>>> +    // Ensure the constant pool/jump table
info is at least
>>>>>>>>> 4-
>>>>>>>>> byte
>>>>>>>>> aligned.
>>>>>>>>> +    emitAlignment(16);
>>>>>>>>> +
>>>>>>>>> +    initConstantPool(F.getConstantPool());
>>>>>>>>> +   
initJumpTableInfo(F.getJumpTableInfo());
>>>>>>>>> +
>>>>>>>>> +    ConstantPoolBase  =
(void*)(((uintptr_t)
>>>>>>>>> ConstantPoolBase) +
>>>>>>>>> CurBufferPtr);
>>>>>>>>> +    JumpTableBase     =
(void*)(((uintptr_t) JumpTableBase) +
>>>>>>>>> CurBufferPtr);
>>>>>>>>> +  }
>>>>>>>>> +
>>>>>>>>> +  virtual bool
finishFunction(MachineFunction &F) {
>>>>>>>>> +    MCE->setCurrentPtr(CurBufferPtr);
>>>>>>>>> +    return false;
>>>>>>>>> +  }
>>>>>>>>> +  virtual void startFunctionStub(unsigned
StubSize, unsigned
>>>>>>>>> Alignment) {}
>>>>>>>>> +  virtual void *finishFunctionStub(const
Function *F)
>>>>>>>>> { return
>>>>>>>>> 0; }
>>>>>>>>> +  virtual void addRelocation(const
llvm::MachineRelocation&)
>>>>>>>>> { }
>>>>>>>>> +  virtual void emitByte(unsigned char B) {
>>>>>>>>> +    CurBufferPtr++;
>>>>>>>>> +  }
>>>>>>>>> +  virtual void emitWordLE(unsigned W) {
>>>>>>>>> +    CurBufferPtr+=4;
>>>>>>>>> +  }
>>>>>>>>> +  virtual void emitWordBE(unsigned W) {
>>>>>>>>> +    CurBufferPtr+=4;
>>>>>>>>> +  }
>>>>>>>>> +  virtual void emitInt32(int Value) {
>>>>>>>>> +    CurBufferPtr += 4;
>>>>>>>>> +  }
>>>>>>>>> +  virtual void emitInt64(uint64_t Value) {
>>>>>>>>> +    CurBufferPtr += 8;
>>>>>>>>> +  }
>>>>>>>>> +  virtual void emitAt(uintptr_t *Addr,
uintptr_t Value) {
>>>>>>>>> +  }
>>>>>>>>> +
>>>>>>>>> +
>>>>>>>>> +
>>>>>>>>> +  virtual void
StartMachineBasicBlock(MachineBasicBlock *MBB)
>>>>>>>>> {}
>>>>>>>>> +  virtual intptr_t
getConstantPoolEntryAddress(unsigned
>>>>>>>>> ConstantNum) const;
>>>>>>>>> +
>>>>>>>>> +  virtual intptr_t
getJumpTableEntryAddress(unsigned Index)
>>>>>>>>> const;
>>>>>>>>> +
>>>>>>>>> +  virtual intptr_t
getMachineBasicBlockAddress
>>>>>>>>> (MachineBasicBlock
>>>>>>>>> *MBB) const {
>>>>>>>>> +    assert(0 && "Should not
be in getMachineBasicBlockAddress
>>>>>>>>> of
>>>>>>>>> SizeEmitter");
>>>>>>>>> +  }
>>>>>>>>> +
>>>>>>>>> +  virtual void emitLabel(uint64_t) {}
>>>>>>>>> +  virtual intptr_t
getLabelAddress(uint64_t LabelID) const {
>>>>>>>>> +    assert(LabelLocations.size() >
(unsigned)LabelID &&
>>>>>>>>> +             LabelLocations[LabelID]
&& "Label not
>>>>>>>>> emitted!");
>>>>>>>>> +      return LabelLocations[LabelID];
>>>>>>>>> +  }
>>>>>>>>> +  virtual void
setModuleInfo(llvm::MachineModuleInfo*) {}
>>>>>>>>> +};
>>>>>>>>> +
>>>>>>>>> +} // end llvm namespace
>>>>>>>>> +
>>>>>>>>> +#endif
>>>>>>>>> Index:
include/llvm/CodeGen/MachineCodeEmitter.h
>>>>>>>>> >>>>>>>>>
==>>>>>>>>> =
>>>>>>>>>
=============================================================>>>>>>>>>
--- include/llvm/CodeGen/MachineCodeEmitter.h    (revision
>>>>>>>>> 48143)
>>>>>>>>> +++
include/llvm/CodeGen/MachineCodeEmitter.h    (working
>>>>>>>>> copy)
>>>>>>>>> @@ -18,6 +18,7 @@
>>>>>>>>> #define LLVM_CODEGEN_MACHINECODEEMITTER_H
>>>>>>>>>
>>>>>>>>> #include
"llvm/Support/DataTypes.h"
>>>>>>>>> +#include <string>
>>>>>>>>> #include <vector>
>>>>>>>>>
>>>>>>>>> namespace llvm {
>>>>>>>>> @@ -92,7 +93,7 @@
>>>>>>>>> /// emitByte - This callback is invoked
when a byte needs to
>>>>>>>>> be
>>>>>>>>> written to the
>>>>>>>>> /// output stream.
>>>>>>>>> ///
>>>>>>>>> -  void emitByte(unsigned char B) {
>>>>>>>>> +  virtual void emitByte(unsigned char B) {
>>>>>>>>> if (CurBufferPtr != BufferEnd)
>>>>>>>>>   *CurBufferPtr++ = B;
>>>>>>>>> }
>>>>>>>>> @@ -100,7 +101,7 @@
>>>>>>>>> /// emitWordLE - This callback is invoked
when a 32-bit word
>>>>>>>>> needs
>>>>>>>>> to be
>>>>>>>>> /// written to the output stream in
little-endian format.
>>>>>>>>> ///
>>>>>>>>> -  void emitWordLE(unsigned W) {
>>>>>>>>> +  virtual void emitWordLE(unsigned W) {
>>>>>>>>> if (CurBufferPtr+4 <= BufferEnd) {
>>>>>>>>>   *CurBufferPtr++ = (unsigned char)(W
>>  0);
>>>>>>>>>   *CurBufferPtr++ = (unsigned char)(W
>>  8);
>>>>>>>>> @@ -114,7 +115,7 @@
>>>>>>>>> /// emitWordBE - This callback is invoked
when a 32-bit word
>>>>>>>>> needs
>>>>>>>>> to be
>>>>>>>>> /// written to the output stream in
big-endian format.
>>>>>>>>> ///
>>>>>>>>> -  void emitWordBE(unsigned W) {
>>>>>>>>> +  virtual void emitWordBE(unsigned W) {
>>>>>>>>> if (CurBufferPtr+4 <= BufferEnd) {
>>>>>>>>>   *CurBufferPtr++ = (unsigned char)(W
>> 24);
>>>>>>>>>   *CurBufferPtr++ = (unsigned char)(W
>> 16);
>>>>>>>>> @@ -175,7 +176,7 @@
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> /// emitInt32 - Emit a int32 directive.
>>>>>>>>> -  void emitInt32(int Value) {
>>>>>>>>> +  virtual void emitInt32(int Value) {
>>>>>>>>> if (CurBufferPtr+4 <= BufferEnd) {
>>>>>>>>>   *((uint32_t*)CurBufferPtr) = Value;
>>>>>>>>>   CurBufferPtr += 4;
>>>>>>>>> @@ -185,7 +186,7 @@
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> /// emitInt64 - Emit a int64 directive.
>>>>>>>>> -  void emitInt64(uint64_t Value) {
>>>>>>>>> +  virtual void emitInt64(uint64_t Value) {
>>>>>>>>> if (CurBufferPtr+8 <= BufferEnd) {
>>>>>>>>>   *((uint64_t*)CurBufferPtr) = Value;
>>>>>>>>>   CurBufferPtr += 8;
>>>>>>>>> @@ -195,7 +196,7 @@
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> /// emitAt - Emit Value in Addr
>>>>>>>>> -  void emitAt(uintptr_t *Addr, uintptr_t
Value) {
>>>>>>>>> +  virtual void emitAt(uintptr_t *Addr,
uintptr_t Value) {
>>>>>>>>> if (Addr >= (uintptr_t*)BufferBegin
&& Addr <
>>>>>>>>> (uintptr_t*)BufferEnd)
>>>>>>>>>   (*Addr) = Value;
>>>>>>>>> }
>>>>>>>>> @@ -270,6 +271,11 @@
>>>>>>>>> /// Specifies the MachineModuleInfo object.
This is used for
>>>>>>>>> exception handling
>>>>>>>>> /// purposes.
>>>>>>>>> virtual void
setModuleInfo(MachineModuleInfo* Info) = 0;
>>>>>>>>> +
>>>>>>>>> +  void setCurrentPtr(unsigned char* Ptr) {
>>>>>>>>> +    CurBufferPtr = Ptr;
>>>>>>>>> +  }
>>>>>>>>> +
>>>>>>>>> };
>>>>>>>>>
>>>>>>>>> } // End llvm namespace
>>>>>>>>> Index: lib/CodeGen/LLVMTargetMachine.cpp
>>>>>>>>> >>>>>>>>>
==>>>>>>>>> =
>>>>>>>>>
=============================================================>>>>>>>>>
--- lib/CodeGen/LLVMTargetMachine.cpp    (revision 48143)
>>>>>>>>> +++ lib/CodeGen/LLVMTargetMachine.cpp   
(working copy)
>>>>>>>>> @@ -17,6 +17,7 @@
>>>>>>>>> #include
"llvm/Assembly/PrintModulePass.h"
>>>>>>>>> #include
"llvm/Analysis/LoopPass.h"
>>>>>>>>> #include "llvm/CodeGen/Passes.h"
>>>>>>>>> +#include
"llvm/CodeGen/SizeEmitter.h"
>>>>>>>>> #include
"llvm/CodeGen/Collector.h"
>>>>>>>>> #include
"llvm/Target/TargetOptions.h"
>>>>>>>>> #include
"llvm/Transforms/Scalar.h"
>>>>>>>>> @@ -257,7 +258,13 @@
>>>>>>>>>
>>>>>>>>> if (addPreEmitPass(PM, Fast) &&
PrintMachineCode)
>>>>>>>>>
PM.add(createMachineFunctionPrinterPass(cerr));
>>>>>>>>> +
>>>>>>>>> +  if (SizedMemoryCode) {
>>>>>>>>> +    SizeEmitter * SE = new
SizeEmitter(&MCE);
>>>>>>>>> +    addSimpleCodeEmitter(PM, Fast, false,
*SE);
>>>>>>>>> +  }
>>>>>>>>>
>>>>>>>>> +
>>>>>>>>> addCodeEmitter(PM, Fast, PrintEmittedAsm,
MCE);
>>>>>>>>>
>>>>>>>>> PM.add(createCollectorMetadataDeleter());
>>>>>>>>> Index: lib/CodeGen/SizeEmitter.cpp
>>>>>>>>> >>>>>>>>>
==>>>>>>>>> =
>>>>>>>>>
=============================================================>>>>>>>>>
--- lib/CodeGen/SizeEmitter.cpp    (revision 0)
>>>>>>>>> +++ lib/CodeGen/SizeEmitter.cpp   
(revision 0)
>>>>>>>>> @@ -0,0 +1,77 @@
>>>>>>>>> +#include
"llvm/CodeGen/SizeEmitter.h"
>>>>>>>>> +#include "llvm/Constant.h"
>>>>>>>>> +#include "llvm/Constants.h"
>>>>>>>>> +#include "llvm/DerivedTypes.h"
>>>>>>>>> +#include "llvm/Module.h"
>>>>>>>>> +#include "llvm/Type.h"
>>>>>>>>> +#include
"llvm/CodeGen/MachineCodeEmitter.h"
>>>>>>>>> +#include
"llvm/CodeGen/MachineFunction.h"
>>>>>>>>> +#include
"llvm/CodeGen/MachineConstantPool.h"
>>>>>>>>> +#include
"llvm/CodeGen/MachineJumpTableInfo.h"
>>>>>>>>> +#include
"llvm/CodeGen/MachineRelocation.h"
>>>>>>>>> +#include
"llvm/ExecutionEngine/GenericValue.h"
>>>>>>>>> +#include
"llvm/Target/TargetData.h"
>>>>>>>>> +#include
"llvm/Target/TargetJITInfo.h"
>>>>>>>>> +#include
"llvm/Target/TargetMachine.h"
>>>>>>>>> +#include
"llvm/Target/TargetOptions.h"
>>>>>>>>> +#include "llvm/Support/Debug.h"
>>>>>>>>> +#include
"llvm/Support/MutexGuard.h"
>>>>>>>>> +#include
"llvm/System/Disassembler.h"
>>>>>>>>> +#include "llvm/ADT/Statistic.h"
>>>>>>>>> +#include "llvm/System/Memory.h"
>>>>>>>>> +#include <algorithm>
>>>>>>>>> +using namespace llvm;
>>>>>>>>> +
>>>>>>>>> +
>>>>>>>>> +void
SizeEmitter::initConstantPool(MachineConstantPool
>>>>>>>>> *MCP) {
>>>>>>>>> +  const
std::vector<MachineConstantPoolEntry> &Constants =
>>>>>>>>> MCP-
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> getConstants();
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>> +  if (Constants.empty()) return;
>>>>>>>>> +
>>>>>>>>> +  MachineConstantPoolEntry CPE =
Constants.back();
>>>>>>>>> +  unsigned Size = CPE.Offset;
>>>>>>>>> +  const Type *Ty =
CPE.isMachineConstantPoolEntry()
>>>>>>>>> +    ? CPE.Val.MachineCPVal->getType() :
CPE.Val.ConstVal-
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> getType();
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>> +  Size +=
Fn->getTarget().getTargetData()-
>>>>>>>>> >getABITypeSize(Ty);
>>>>>>>>> +  ConstantPoolBase = allocateSpace(Size, 1
<< MCP-
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> getConstantPoolAlignment());
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>> +  ConstantPool = MCP;
>>>>>>>>> +}
>>>>>>>>> +
>>>>>>>>> +void
SizeEmitter::initJumpTableInfo(MachineJumpTableInfo
>>>>>>>>> *MJTI) {
>>>>>>>>> +  const
std::vector<MachineJumpTableEntry> &JT = MJTI-
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> getJumpTables();
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>> +  if (JT.empty()) return;
>>>>>>>>> +
>>>>>>>>> +  unsigned NumEntries = 0;
>>>>>>>>> +  for (unsigned i = 0, e = JT.size(); i !=
e; ++i)
>>>>>>>>> +    NumEntries += JT[i].MBBs.size();
>>>>>>>>> +
>>>>>>>>> +  unsigned EntrySize =
MJTI->getEntrySize();
>>>>>>>>> +
>>>>>>>>> +  // Just allocate space for all the jump
tables now.  We
>>>>>>>>> will
>>>>>>>>> fix
>>>>>>>>> up the actual
>>>>>>>>> +  // MBB entries in the tables after we
emit the code for
>>>>>>>>> each
>>>>>>>>> block, since then
>>>>>>>>> +  // we will know the final locations of
the MBBs in memory.
>>>>>>>>> +  JumpTable = MJTI;
>>>>>>>>> +  JumpTableBase = allocateSpace(NumEntries
* EntrySize, MJTI-
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> getAlignment());
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>> +}
>>>>>>>>> +
>>>>>>>>> +intptr_t
SizeEmitter::getConstantPoolEntryAddress(unsigned
>>>>>>>>> ConstantNum) const {
>>>>>>>>> +  assert(ConstantNum <
ConstantPool->getConstants().size() &&
>>>>>>>>> +         "Invalid
ConstantPoolIndex!");
>>>>>>>>> +  return (intptr_t)ConstantPoolBase +
>>>>>>>>> +        
ConstantPool->getConstants()[ConstantNum].Offset;
>>>>>>>>> +}
>>>>>>>>> +
>>>>>>>>> +intptr_t
SizeEmitter::getJumpTableEntryAddress(unsigned
>>>>>>>>> Index)
>>>>>>>>> const {
>>>>>>>>> +  const
std::vector<MachineJumpTableEntry> &JT = JumpTable-
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> getJumpTables();
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>> +  assert(Index < JT.size() &&
"Invalid jump table index!");
>>>>>>>>> +
>>>>>>>>> +  unsigned Offset = 0;
>>>>>>>>> +  unsigned EntrySize =
JumpTable->getEntrySize();
>>>>>>>>> +
>>>>>>>>> +  for (unsigned i = 0; i < Index; ++i)
>>>>>>>>> +    Offset += JT[i].MBBs.size();
>>>>>>>>> +
>>>>>>>>> +   Offset *= EntrySize;
>>>>>>>>> +
>>>>>>>>> +  return (intptr_t)((char *)JumpTableBase
+ Offset);
>>>>>>>>> +}
>>>>>>>>> +
>>>>>>>>> Index: lib/Target/TargetMachine.cpp
>>>>>>>>> >>>>>>>>>
==>>>>>>>>> =
>>>>>>>>>
=============================================================>>>>>>>>>
--- lib/Target/TargetMachine.cpp (revision 48143)
>>>>>>>>> +++ lib/Target/TargetMachine.cpp (working
copy)
>>>>>>>>> @@ -31,6 +31,7 @@
>>>>>>>>> bool UseSoftFloat;
>>>>>>>>> bool NoZerosInBSS;
>>>>>>>>> bool ExceptionHandling;
>>>>>>>>> +  bool SizedMemoryCode;
>>>>>>>>> Reloc::Model RelocationModel;
>>>>>>>>> CodeModel::Model CMModel;
>>>>>>>>> bool PerformTailCallOpt;
>>>>>>>>> Index:
lib/ExecutionEngine/JIT/JITEmitter.cpp
>>>>>>>>> >>>>>>>>>
==>>>>>>>>> =
>>>>>>>>>
=============================================================>>>>>>>>>
--- lib/ExecutionEngine/JIT/JITEmitter.cpp    (revision 48143)
>>>>>>>>> +++ lib/ExecutionEngine/JIT/JITEmitter.cpp 
(working copy)
>>>>>>>>> @@ -18,12 +18,14 @@
>>>>>>>>> #include "llvm/Constant.h"
>>>>>>>>> #include "llvm/Module.h"
>>>>>>>>> #include "llvm/Type.h"
>>>>>>>>> +#include "llvm/ADT/DenseMap.h"
>>>>>>>>> #include
"llvm/CodeGen/MachineCodeEmitter.h"
>>>>>>>>> #include
"llvm/CodeGen/MachineFunction.h"
>>>>>>>>> #include
"llvm/CodeGen/MachineConstantPool.h"
>>>>>>>>> #include
"llvm/CodeGen/MachineJumpTableInfo.h"
>>>>>>>>> #include
"llvm/CodeGen/MachineModuleInfo.h"
>>>>>>>>> #include
"llvm/CodeGen/MachineRelocation.h"
>>>>>>>>> +#include
"llvm/CodeGen/SizeEmitter.h"
>>>>>>>>> #include
"llvm/ExecutionEngine/JITMemoryManager.h"
>>>>>>>>> #include
"llvm/Target/TargetData.h"
>>>>>>>>> #include
"llvm/Target/TargetJITInfo.h"
>>>>>>>>> @@ -370,6 +376,7 @@
>>>>>>>>> virtual void startFunction(MachineFunction
&F);
>>>>>>>>> virtual bool finishFunction(MachineFunction
&F);
>>>>>>>>>
>>>>>>>>> +    void
initConstantPool(MachineConstantPool *MCP);
>>>>>>>>> void emitConstantPool(MachineConstantPool
*MCP);
>>>>>>>>> void initJumpTableInfo(MachineJumpTableInfo
*MJTI);
>>>>>>>>> void emitJumpTableInfo(MachineJumpTableInfo
*MJTI);
>>>>>>>>> @@ -469,19 +476,47 @@
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> void
JITEmitter::startFunction(MachineFunction &F) {
>>>>>>>>> -  uintptr_t ActualSize;
>>>>>>>>> -  BufferBegin = CurBufferPtr = MemMgr-
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> startFunctionBody(F.getFunction(),
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>> -
>>>>>>>>> ActualSize);
>>>>>>>>> -  BufferEnd = BufferBegin+ActualSize;
>>>>>>>>> +  MMI->BeginFunction(&F);
>>>>>>>>>
>>>>>>>>> -  // Ensure the constant pool/jump table
info is at least 4-
>>>>>>>>> byte
>>>>>>>>> aligned.
>>>>>>>>> -  emitAlignment(16);
>>>>>>>>> +  if (SizedMemoryCode) {
>>>>>>>>> +    BufferBegin = CurBufferPtr;
>>>>>>>>> +    BufferEnd = (unsigned char*)
0xffffffff;
>>>>>>>>> +
>>>>>>>>> +    // Ensure the constant pool/jump table
info is at least
>>>>>>>>> 4-
>>>>>>>>> byte
>>>>>>>>> aligned.
>>>>>>>>> +    emitAlignment(16);
>>>>>>>>>
>>>>>>>>> -  emitConstantPool(F.getConstantPool());
>>>>>>>>> -  initJumpTableInfo(F.getJumpTableInfo());
>>>>>>>>> +    initConstantPool(F.getConstantPool());
>>>>>>>>> +   
initJumpTableInfo(F.getJumpTableInfo());
>>>>>>>>> +
>>>>>>>>> +
>>>>>>>>> +    uintptr_t ActualSize =
(uintptr_t)CurBufferPtr;
>>>>>>>>> +    CurBufferPtr =
MemMgr->startFunctionBody(F.getFunction(),
>>>>>>>>> +                                          
ActualSize);
>>>>>>>>> +
>>>>>>>>> +    ConstantPoolBase  =
(void*)(((unsigned)
>>>>>>>>> ConstantPoolBase) +
>>>>>>>>> CurBufferPtr);
>>>>>>>>> +    JumpTableBase     =
(void*)(((unsigned) JumpTableBase) +
>>>>>>>>> CurBufferPtr);
>>>>>>>>>
>>>>>>>>> -  // About to start emitting the machine
code for the
>>>>>>>>> function.
>>>>>>>>> - 
emitAlignment(std::max(F.getFunction()->getAlignment(),
>>>>>>>>> 8U));
>>>>>>>>> +    emitConstantPool(F.getConstantPool());
>>>>>>>>> +
>>>>>>>>> +  } else {
>>>>>>>>> +    uintptr_t ActualSize;
>>>>>>>>> +    BufferBegin = CurBufferPtr = MemMgr-
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> startFunctionBody(F.getFunction(),
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>> +
>>>>>>>>> ActualSize);
>>>>>>>>> +    BufferEnd = BufferBegin+ActualSize;
>>>>>>>>> +
>>>>>>>>> +    // Ensure the constant pool/jump table
info is at least
>>>>>>>>> 4-
>>>>>>>>> byte
>>>>>>>>> aligned.
>>>>>>>>> +    emitAlignment(16);
>>>>>>>>> +
>>>>>>>>> +    initConstantPool(F.getConstantPool());
>>>>>>>>> +    emitConstantPool(F.getConstantPool());
>>>>>>>>> +   
initJumpTableInfo(F.getJumpTableInfo());
>>>>>>>>> +
>>>>>>>>> +    // About to start emitting the machine
code for the
>>>>>>>>> function.
>>>>>>>>> +   
emitAlignment(std::max(F.getFunction()->getAlignment(),
>>>>>>>>> 8U));
>>>>>>>>> +
>>>>>>>>> +  }
>>>>>>>>> +
>>>>>>>>> +
>>>>>>>>>
TheJIT->updateGlobalMapping(F.getFunction(), CurBufferPtr);
>>>>>>>>>
>>>>>>>>> MBBLocations.clear();
>>>>>>>>> @@ -579,12 +614,18 @@
>>>>>>>>> DOUT << "Disassembled
code:\n"
>>>>>>>>>      <<
sys::disassembleBuffer(FnStart, FnEnd-FnStart,
>>>>>>>>> (uintptr_t)FnStart);
>>>>>>>>> #endif
>>>>>>>>> +
>>>>>>>>> if (ExceptionHandling) {
>>>>>>>>> uintptr_t ActualSize;
>>>>>>>>> +    if (SizedMemoryCode) {
>>>>>>>>> +      SizeEmitter sz(LabelLocations);
>>>>>>>>> +      DE->EmitDwarfTable(F, sz,
FnStart, FnEnd);
>>>>>>>>> +      ActualSize = sz.getCurrentPCValue();
>>>>>>>>> +    }
>>>>>>>>> SavedBufferBegin = BufferBegin;
>>>>>>>>> SavedBufferEnd = BufferEnd;
>>>>>>>>> SavedCurBufferPtr = CurBufferPtr;
>>>>>>>>> -
>>>>>>>>> +
>>>>>>>>> BufferBegin = CurBufferPtr = MemMgr-
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> startExceptionTable(F.getFunction(),
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>> ActualSize);
>>>>>>>>> BufferEnd = BufferBegin+ActualSize;
>>>>>>>>> @@ -598,11 +639,10 @@
>>>>>>>>> TheJIT->RegisterTable(FrameRegister);
>>>>>>>>> }
>>>>>>>>> MMI->EndFunction();
>>>>>>>>> -
>>>>>>>>> return false;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> -void
JITEmitter::emitConstantPool(MachineConstantPool *MCP) {
>>>>>>>>> +void
JITEmitter::initConstantPool(MachineConstantPool *MCP) {
>>>>>>>>> const
std::vector<MachineConstantPoolEntry> &Constants = MCP-
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> getConstants();
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>> if (Constants.empty()) return;
>>>>>>>>>
>>>>>>>>> @@ -611,12 +651,15 @@
>>>>>>>>> const Type *Ty =
CPE.isMachineConstantPoolEntry()
>>>>>>>>> ? CPE.Val.MachineCPVal->getType() :
CPE.Val.ConstVal->getType
>>>>>>>>> ();
>>>>>>>>> Size +=
TheJIT->getTargetData()->getABITypeSize(Ty);
>>>>>>>>> -
>>>>>>>>> +
>>>>>>>>> ConstantPoolBase = allocateSpace(Size, 1
<< MCP-
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> getConstantPoolAlignment());
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>> ConstantPool = MCP;
>>>>>>>>> +}
>>>>>>>>>
>>>>>>>>> +void
JITEmitter::emitConstantPool(MachineConstantPool *MCP) {
>>>>>>>>> if (ConstantPoolBase == 0) return;  //
Buffer overflow.
>>>>>>>>>
>>>>>>>>> +  const
std::vector<MachineConstantPoolEntry> &Constants =
>>>>>>>>> MCP-
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> getConstants();
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>> // Initialize the memory for all of the
constant pool entries.
>>>>>>>>> for (unsigned i = 0, e = Constants.size();
i != e; ++i) {
>>>>>>>>> void *CAddr =
(char*)ConstantPoolBase+Constants[i].Offset;
>>>>>>>>>
_______________________________________________
>>>>>>>>> LLVM Developers mailing list
>>>>>>>>> LLVMdev at cs.uiuc.edu        
http://llvm.cs.uiuc.edu
>>>>>>>>>
http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> LLVM Developers mailing list
>>>>>>>> LLVMdev at cs.uiuc.edu        
http://llvm.cs.uiuc.edu
>>>>>>>>
http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> LLVM Developers mailing list
>>>>>>> LLVMdev at cs.uiuc.edu        
http://llvm.cs.uiuc.edu
>>>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>> _______________________________________________
>>>>>> LLVM Developers mailing list
>>>>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>>
>>>>>>
>>>>>>
>>>>> _______________________________________________
>>>>> LLVM Developers mailing list
>>>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>
>>>>>
>>>> _______________________________________________
>>>> LLVM Developers mailing list
>>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>
>>>>
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

Nicolas Geoffray

2008-Apr-14 13:07 UTC

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[LLVMdev] Being able to know the jitted code-size before emitting

Hi Evan,

Evan Cheng wrote:>
> Yeah, sorry I'm stubborn sometimes. :-) And really I think adding the  
> code size functionality is not really that complicated. I would be  
> happy to help if you run into issues.
>
>   
What do you think of adding a 
TargetMachine::getFunctionSize(MachineFunction*) and a 
TargetInstrInfo::getInstructionSize(MachineInstruction*)? Is this a good 
place to make them available to other passes? (ie the JIT)

Thanks,
Nicolas
> Thanks.
>
> Evan
>

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