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emit.cpp
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emit.cpp
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//
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
//
/*XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XX XX
XX emit.cpp XX
XX XX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
*/
#include "jitpch.h"
#ifdef _MSC_VER
#pragma hdrstop
#endif
#include "instr.h"
#include "emit.h"
#include "codegen.h"
/*****************************************************************************
*
* Represent an emitter location.
*/
void emitLocation::CaptureLocation(emitter* emit)
{
ig = emit->emitCurIG;
codePos = emit->emitCurOffset();
assert(Valid());
}
bool emitLocation::IsCurrentLocation(emitter* emit) const
{
assert(Valid());
return (ig == emit->emitCurIG) &&
(codePos == emit->emitCurOffset());
}
UNATIVE_OFFSET emitLocation::CodeOffset(emitter* emit) const
{
assert(Valid());
return emit->emitCodeOffset(ig, codePos);
}
int emitLocation::GetInsNum() const
{
return emitGetInsNumFromCodePos(codePos);
}
#ifdef _TARGET_AMD64_
// Get the instruction offset in the current instruction group, which must be a funclet prolog group.
// This is used to find an instruction offset used in unwind data.
// TODO-AMD64-Bug?: We only support a single main function prolog group, but allow for multiple funclet prolog
// groups (not that we actually use that flexibility, since the funclet prolog will be small). How to
// handle that?
UNATIVE_OFFSET emitLocation::GetFuncletPrologOffset(emitter* emit) const
{
assert(ig->igFuncIdx != 0);
assert((ig->igFlags & IGF_FUNCLET_PROLOG) != 0);
assert(ig == emit->emitCurIG);
return emit->emitCurIGsize;
}
#endif // _TARGET_AMD64_
#ifdef DEBUG
void emitLocation::Print() const
{
unsigned insNum = emitGetInsNumFromCodePos(codePos);
unsigned insOfs = emitGetInsOfsFromCodePos(codePos);
printf("(G_M%03u_IG%02u,ins#%d,ofs#%d)", Compiler::s_compMethodsCount, ig->igNum, insNum, insOfs);
}
#endif // DEBUG
/*****************************************************************************
*
* Return the name of an instruction format.
*/
#if defined(DEBUG) || EMITTER_STATS
const char * emitter::emitIfName(unsigned f)
{
static
const char * const ifNames[] =
{
#define IF_DEF(en, op1, op2) "IF_" #en,
#include "emitfmts.h"
};
static
char errBuff[32];
if (f < sizeof(ifNames)/sizeof(*ifNames))
return ifNames[f];
sprintf_s(errBuff, sizeof(errBuff), "??%u??", f);
return errBuff;
}
#endif
#ifdef TRANSLATE_PDB
/* these are protected */
AddrMap * emitter::emitPDBOffsetTable = 0;
LocalMap * emitter::emitPDBLocalTable = 0;
bool emitter::emitIsPDBEnabled = true;
BYTE * emitter::emitILBaseOfCode = 0;
BYTE * emitter::emitILMethodBase = 0;
BYTE * emitter::emitILMethodStart = 0;
BYTE * emitter::emitImgBaseOfCode = 0;
void emitter::MapCode( int ilOffset, BYTE *imgDest )
{
if ( emitIsPDBEnabled )
{
emitPDBOffsetTable->MapSrcToDest( ilOffset, (int)( imgDest - emitImgBaseOfCode ));
}
}
void emitter::MapFunc( int imgOff, int procLen, int dbgStart, int dbgEnd, short frameReg,
int stkAdjust, int lvaCount, OptJit::LclVarDsc *lvaTable, bool framePtr )
{
if ( emitIsPDBEnabled )
{
// this code stores information about local symbols for the PDB translation
assert( lvaCount >=0 ); // don't allow a negative count
LvaDesc *rgLvaDesc = 0;
if ( lvaCount > 0 )
{
rgLvaDesc = new LvaDesc[lvaCount];
if (!rgLvaDesc)
{
NOMEM();
}
LvaDesc *pDst = rgLvaDesc;
OptJit::LclVarDsc *pSrc = lvaTable;
for ( int i = 0; i < lvaCount; ++i, ++pDst, ++pSrc )
{
pDst->slotNum = pSrc->lvSlotNum;
pDst->isReg = pSrc->lvRegister;
pDst->reg = (pSrc->lvRegister ? pSrc->lvRegNum : frameReg );
pDst->off = pSrc->lvStkOffs + stkAdjust;
}
}
emitPDBLocalTable->AddFunc( (int)(emitILMethodBase - emitILBaseOfCode),
imgOff - (int)emitImgBaseOfCode,
procLen,
dbgStart - imgOff,
dbgEnd - imgOff,
lvaCount,
rgLvaDesc,
framePtr );
// do not delete rgLvaDesc here -- responsibility is now on emitPDBLocalTable destructor
}
}
/* these are public */
void emitter::SetILBaseOfCode ( BYTE *pTextBase )
{
emitILBaseOfCode = pTextBase;
}
void emitter::SetILMethodBase ( BYTE *pMethodEntry )
{
emitILMethodBase = pMethodEntry;
}
void emitter::SetILMethodStart( BYTE *pMethodCode )
{
emitILMethodStart = pMethodCode;
}
void emitter::SetImgBaseOfCode( BYTE *pTextBase )
{
emitImgBaseOfCode = pTextBase;
}
void emitter::SetIDBaseToProlog()
{
emitInstrDescILBase = (int)( emitILMethodBase - emitILBaseOfCode );
}
void emitter::SetIDBaseToOffset( int methodOffset )
{
emitInstrDescILBase = methodOffset + (int)( emitILMethodStart - emitILBaseOfCode );
}
void emitter::DisablePDBTranslation()
{
// this function should disable PDB translation code
emitIsPDBEnabled = false;
}
bool emitter::IsPDBEnabled()
{
return emitIsPDBEnabled;
}
void emitter::InitTranslationMaps( int ilCodeSize )
{
if ( emitIsPDBEnabled )
{
emitPDBOffsetTable = AddrMap::Create( ilCodeSize );
emitPDBLocalTable = LocalMap::Create();
}
}
void emitter::DeleteTranslationMaps()
{
if ( emitPDBOffsetTable )
{
delete emitPDBOffsetTable;
emitPDBOffsetTable = 0;
}
if ( emitPDBLocalTable )
{
delete emitPDBLocalTable;
emitPDBLocalTable = 0;
}
}
void emitter::InitTranslator( PDBRewriter * pPDB,
int * rgSecMap,
IMAGE_SECTION_HEADER ** rgpHeader,
int numSections )
{
if ( emitIsPDBEnabled )
{
pPDB->InitMaps( rgSecMap, // new PE section header order
rgpHeader, // array of section headers
numSections, // number of sections
emitPDBOffsetTable, // code offset translation table
emitPDBLocalTable ); // slot variable translation table
}
}
#endif // TRANSLATE_PDB
/*****************************************************************************/
#if EMITTER_STATS
static unsigned totAllocdSize;
static unsigned totActualSize;
unsigned emitter::emitIFcounts[emitter::IF_COUNT];
static unsigned emitSizeBuckets[] = { 100, 1024*1, 1024*2, 1024*3, 1024*4, 1024*5, 1024*10, 0 };
static histo emitSizeTable(DefaultAllocator::Singleton(), emitSizeBuckets);
static unsigned GCrefsBuckets[] = { 0, 1, 2, 5, 10, 20, 50, 128, 256, 512, 1024, 0 };
static histo GCrefsTable(DefaultAllocator::Singleton(), GCrefsBuckets);
static unsigned stkDepthBuckets[] = { 0, 1, 2, 5, 10, 16, 32, 128, 1024, 0 };
static histo stkDepthTable(DefaultAllocator::Singleton(), stkDepthBuckets);
size_t emitter::emitSizeMethod;
size_t emitter::emitTotMemAlloc;
unsigned emitter::emitTotalInsCnt;
unsigned emitter::emitTotalIGcnt;
unsigned emitter::emitTotalPhIGcnt;
unsigned emitter::emitTotalIGjmps;
unsigned emitter::emitTotalIGptrs;
unsigned emitter::emitTotalIGicnt;
size_t emitter::emitTotalIGsize;
unsigned emitter::emitTotalIGmcnt;
unsigned emitter::emitSmallDspCnt;
unsigned emitter::emitLargeDspCnt;
unsigned emitter::emitSmallCnsCnt;
unsigned emitter::emitLargeCnsCnt;
unsigned emitter::emitSmallCns[SMALL_CNS_TSZ];
void emitterStaticStats(FILE* fout)
{
// insGroup members
fprintf(fout, "\n");
fprintf(fout, "insGroup:\n");
fprintf(fout, "Offset of igNext = %2u\n", offsetof(insGroup, igNext ));
#ifdef DEBUG
fprintf(fout, "Offset of igSelf = %2u\n", offsetof(insGroup, igSelf ));
#endif
fprintf(fout, "Offset of igNum = %2u\n", offsetof(insGroup, igNum ));
fprintf(fout, "Offset of igOffs = %2u\n", offsetof(insGroup, igOffs ));
fprintf(fout, "Offset of igFuncIdx = %2u\n", offsetof(insGroup, igFuncIdx ));
fprintf(fout, "Offset of igFlags = %2u\n", offsetof(insGroup, igFlags ));
fprintf(fout, "Offset of igSize = %2u\n", offsetof(insGroup, igSize ));
fprintf(fout, "Offset of igData = %2u\n", offsetof(insGroup, igData ));
#if EMIT_TRACK_STACK_DEPTH
fprintf(fout, "Offset of igStkLvl = %2u\n", offsetof(insGroup, igStkLvl ));
#endif
fprintf(fout, "Offset of igGCregs = %2u\n", offsetof(insGroup, igGCregs ));
fprintf(fout, "Offset of igInsCnt = %2u\n", offsetof(insGroup, igInsCnt ));
fprintf(fout, "Size of insGroup = %u\n", sizeof( insGroup ));
// insPlaceholderGroupData members
fprintf(fout, "\n");
fprintf(fout, "insPlaceholderGroupData:\n");
fprintf(fout, "Offset of igPhNext = %2u\n", offsetof(emitter::insPlaceholderGroupData, igPhNext ));
fprintf(fout, "Offset of igPhBB = %2u\n", offsetof(emitter::insPlaceholderGroupData, igPhBB ));
fprintf(fout, "Offset of igPhInitGCrefVars = %2u\n", offsetof(emitter::insPlaceholderGroupData, igPhInitGCrefVars ));
fprintf(fout, "Offset of igPhInitGCrefRegs = %2u\n", offsetof(emitter::insPlaceholderGroupData, igPhInitGCrefRegs ));
fprintf(fout, "Offset of igPhInitByrefRegs = %2u\n", offsetof(emitter::insPlaceholderGroupData, igPhInitByrefRegs ));
fprintf(fout, "Offset of igPhPrevGCrefVars = %2u\n", offsetof(emitter::insPlaceholderGroupData, igPhPrevGCrefVars ));
fprintf(fout, "Offset of igPhPrevGCrefRegs = %2u\n", offsetof(emitter::insPlaceholderGroupData, igPhPrevGCrefRegs ));
fprintf(fout, "Offset of igPhPrevByrefRegs = %2u\n", offsetof(emitter::insPlaceholderGroupData, igPhPrevByrefRegs ));
fprintf(fout, "Offset of igPhType = %2u\n", offsetof(emitter::insPlaceholderGroupData, igPhType ));
fprintf(fout, "Size of insPlaceholderGroupData = %u\n", sizeof( emitter::insPlaceholderGroupData ));
fprintf(fout, "\n");
fprintf(fout, "Size of tinyID = %2u\n", TINY_IDSC_SIZE);
fprintf(fout, "Size of instrDesc = %2u\n", sizeof( emitter::instrDesc ));
//fprintf(fout, "Offset of _idIns = %2u\n", offsetof(emitter::instrDesc, _idIns ));
//fprintf(fout, "Offset of _idInsFmt = %2u\n", offsetof(emitter::instrDesc, _idInsFmt ));
//fprintf(fout, "Offset of _idOpSize = %2u\n", offsetof(emitter::instrDesc, _idOpSize ));
//fprintf(fout, "Offset of idSmallCns = %2u\n", offsetof(emitter::instrDesc, idSmallCns ));
//fprintf(fout, "Offset of _idAddrUnion= %2u\n", offsetof(emitter::instrDesc, _idAddrUnion));
//fprintf(fout, "\n");
//fprintf(fout, "Size of _idAddrUnion= %2u\n", sizeof(((emitter::instrDesc*)0)->_idAddrUnion));
fprintf(fout, "\n");
fprintf(fout, "GCInfo::regPtrDsc:\n");
fprintf(fout, "Offset of rpdNext = %2u\n", offsetof(GCInfo::regPtrDsc, rpdNext ));
fprintf(fout, "Offset of rpdOffs = %2u\n", offsetof(GCInfo::regPtrDsc, rpdOffs ));
fprintf(fout, "Offset of <union> = %2u\n", offsetof(GCInfo::regPtrDsc, rpdPtrArg));
fprintf(fout, "Size of GCInfo::regPtrDsc = %2u\n", sizeof( GCInfo::regPtrDsc ));
fprintf(fout, "\n");
}
void emitterStats(FILE* fout)
{
if (totAllocdSize > 0)
{
assert(totActualSize <= totAllocdSize);
fprintf(fout, "\nTotal allocated code size = %u\n", totAllocdSize);
if (totActualSize < totAllocdSize)
{
fprintf(fout, "Total generated code size = %u ", totActualSize);
fprintf(fout, "(%4.3f%% waste)", 100 * ((totAllocdSize - totActualSize) / (double)totActualSize));
fprintf(fout, "\n");
}
assert(emitter::emitTotalInsCnt);
fprintf(fout, "Average of %4.2f bytes of code generated per instruction\n", (double)totActualSize / emitter::emitTotalInsCnt);
}
fprintf(fout, "\nInstruction format frequency table:\n\n");
unsigned f, ic = 0, dc = 0;
for (f = 0; f < emitter::IF_COUNT; f++)
{
ic += emitter::emitIFcounts[f];
}
for (f = 0; f < emitter::IF_COUNT; f++)
{
unsigned c = emitter::emitIFcounts[f];
if ((c > 0) && (1000 * c >= ic))
{
dc += c;
fprintf(fout, " %-13s %8u (%5.2f%%)\n", emitter::emitIfName(f), c, 100.0 * c / ic);
}
}
fprintf(fout, " --------------------------------\n");
fprintf(fout, " %-13s %8u (%5.2f%%)\n", "Total shown", dc, 100.0 * dc / ic);
if (emitter::emitTotalIGmcnt)
{
fprintf(fout, "Total of %8u methods\n", emitter::emitTotalIGmcnt);
fprintf(fout, "Total of %8u insGroup\n", emitter::emitTotalIGcnt);
fprintf(fout, "Total of %8u insPlaceholderGroupData\n", emitter::emitTotalPhIGcnt);
fprintf(fout, "Total of %8u instructions\n", emitter::emitTotalIGicnt);
fprintf(fout, "Total of %8u jumps\n", emitter::emitTotalIGjmps);
fprintf(fout, "Total of %8u GC livesets\n", emitter::emitTotalIGptrs);
fprintf(fout, "\n");
fprintf(fout, "Average of %8.1lf insGroup per method\n", (double)emitter::emitTotalIGcnt / emitter::emitTotalIGmcnt);
fprintf(fout, "Average of %8.1lf insPhGroup per method\n", (double)emitter::emitTotalPhIGcnt/ emitter::emitTotalIGmcnt);
fprintf(fout, "Average of %8.1lf instructions per method\n", (double)emitter::emitTotalIGicnt / emitter::emitTotalIGmcnt);
fprintf(fout, "Average of %8.1lf desc. bytes per method\n", (double)emitter::emitTotalIGsize / emitter::emitTotalIGmcnt);
fprintf(fout, "Average of %8.1lf jumps per method\n", (double)emitter::emitTotalIGjmps / emitter::emitTotalIGmcnt);
fprintf(fout, "Average of %8.1lf GC livesets per method\n", (double)emitter::emitTotalIGptrs / emitter::emitTotalIGmcnt);
fprintf(fout, "\n");
fprintf(fout, "Average of %8.1lf instructions per group \n", (double)emitter::emitTotalIGicnt / emitter::emitTotalIGcnt);
fprintf(fout, "Average of %8.1lf desc. bytes per group \n", (double)emitter::emitTotalIGsize / emitter::emitTotalIGcnt);
fprintf(fout, "Average of %8.1lf jumps per group \n", (double)emitter::emitTotalIGjmps / emitter::emitTotalIGcnt);
fprintf(fout, "\n");
fprintf(fout, "Average of %8.1lf bytes per instrDesc\n", (double)emitter::emitTotalIGsize / emitter::emitTotalIGicnt);
fprintf(fout, "\n");
fprintf(fout, "A total of %8u desc. bytes\n" , emitter::emitTotalIGsize);
fprintf(fout, "\n");
}
fprintf(fout, "Descriptor size distribution:\n");
emitSizeTable.histoDsp(fout);
fprintf(fout, "\n");
fprintf(fout, "GC ref frame variable counts:\n");
GCrefsTable.histoDsp(fout);
fprintf(fout, "\n");
fprintf(fout, "Max. stack depth distribution:\n");
stkDepthTable.histoDsp(fout);
fprintf(fout, "\n");
int i;
unsigned c;
unsigned m;
if (emitter::emitSmallCnsCnt || emitter::emitLargeCnsCnt)
{
fprintf(fout, "SmallCnsCnt = %6u\n" , emitter::emitSmallCnsCnt);
fprintf(fout, "LargeCnsCnt = %6u (%3u %% of total)\n", emitter::emitLargeCnsCnt, 100*emitter::emitLargeCnsCnt/(emitter::emitLargeCnsCnt+emitter::emitSmallCnsCnt));
}
#if 0
// TODO-Cleanup: WHy is this in #if 0 - Is EMITTER_STATS ever used? Fix or delete this.
if (emitter::emitSmallCnsCnt)
{
fprintf(fout, "\n");
m = emitter::emitSmallCnsCnt/1000 + 1;
for (i = ID_MIN_SMALL_CNS; i < ID_MAX_SMALL_CNS; i++)
{
c = emitter::emitSmallCns[i-ID_MIN_SMALL_CNS];
if (c >= m)
fprintf(fout, "cns[%4d] = %u\n", i, c);
}
}
#endif // 0
fprintf(fout, "%8u bytes allocated in the emitter\n", emitter::emitTotMemAlloc);
}
#endif // EMITTER_STATS
/*****************************************************************************/
const unsigned short emitTypeSizes[] =
{
#define DEF_TP(tn,nm,jitType,verType,sz,sze,asze,st,al,tf,howUsed) sze,
#include "typelist.h"
#undef DEF_TP
};
const unsigned short emitTypeActSz[] =
{
#define DEF_TP(tn,nm,jitType,verType,sz,sze,asze,st,al,tf,howUsed) asze,
#include "typelist.h"
#undef DEF_TP
};
/*****************************************************************************/
/*****************************************************************************
*
* Initialize the emitter - called once, at DLL load time.
*/
void emitter::emitInit()
{
}
/*****************************************************************************
*
* Shut down the emitter - called once, at DLL exit time.
*/
void emitter::emitDone()
{
}
/*****************************************************************************
*
* Allocate memory.
*/
void* emitter::emitGetMem(size_t sz)
{
assert(sz % sizeof(int) == 0);
#if EMITTER_STATS
emitTotMemAlloc += sz;
#endif
return emitComp->compGetMem(sz, CMK_InstDesc);
}
/*****************************************************************************
*
* emitLclVarAddr support methods
*/
void emitLclVarAddr::initLclVarAddr(int varNum, unsigned offset)
{
if (varNum < 32768)
{
if (varNum >= 0)
{
if (offset < 32768)
{
_lvaTag = LVA_STANDARD_ENCODING;
_lvaExtra = offset; // offset known to be in [0..32767]
_lvaVarNum = (unsigned) varNum; // varNum known to be in [0..32767]
}
else // offset >= 32768
{
// We could support larger local offsets here at the cost of less varNums
if (offset >= 65536)
IMPL_LIMITATION("JIT doesn't support offsets larger than 65535 into valuetypes\n");
_lvaTag = LVA_LARGE_OFFSET;
_lvaExtra = (offset-32768); // (offset-32768) is known to be in [0..32767]
_lvaVarNum = (unsigned) varNum; // varNum known to be in [0..32767]
}
}
else // varNum < 0, These are used for Compiler spill temps
{
if (varNum < -32767)
IMPL_LIMITATION("JIT doesn't support more than 32767 Compiler Spill temps\n");
if (offset > 32767)
IMPL_LIMITATION("JIT doesn't support offsets larger than 32767 into valuetypes for Compiler Spill temps\n");
_lvaTag = LVA_COMPILER_TEMP;
_lvaExtra = offset; // offset known to be in [0..32767]
_lvaVarNum = (unsigned) (-varNum); // -varNum known to be in [1..32767]
}
}
else // varNum >= 32768
{
if (offset >= 256)
IMPL_LIMITATION("JIT doesn't support offsets larger than 255 into valuetypes for local vars > 32767\n");
if (varNum >= 0x00400000) // 0x00400000 == 2^22
IMPL_LIMITATION("JIT doesn't support more than 2^22 variables\n");
_lvaTag = LVA_LARGE_VARNUM;
_lvaVarNum = varNum & 0x00007FFF; // varNum bits 14 to 0
_lvaExtra = (varNum & 0x003F8000) >> 15; // varNum bits 21 to 15 in _lvaExtra bits 6 to 0, 7 bits total
_lvaExtra |= (offset << 7); // offset bits 7 to 0 in _lvaExtra bits 14 to 7, 8 bits total
}
}
// Returns the variable to access. Note that it returns a negative number for compiler spill temps.
int emitLclVarAddr::lvaVarNum()
{
switch (_lvaTag)
{
case LVA_COMPILER_TEMP:
return -((int) _lvaVarNum);
case LVA_LARGE_VARNUM:
return (int) (((_lvaExtra & 0x007F) << 15) + _lvaVarNum);
default: // LVA_STANDARD_ENCODING or LVA_LARGE_OFFSET
assert((_lvaTag == LVA_STANDARD_ENCODING) || (_lvaTag == LVA_LARGE_OFFSET));
return (int) _lvaVarNum;
}
}
unsigned emitLclVarAddr::lvaOffset() // returns the offset into the variable to access
{
switch (_lvaTag)
{
case LVA_LARGE_OFFSET:
return (32768 + _lvaExtra);
case LVA_LARGE_VARNUM:
return (_lvaExtra & 0x7F80) >> 7;
default: // LVA_STANDARD_ENCODING or LVA_COMPILER_TEMP
assert((_lvaTag == LVA_STANDARD_ENCODING) || (_lvaTag == LVA_COMPILER_TEMP));
return _lvaExtra;
}
}
/*****************************************************************************
*
* Record some info about the method about to be emitted.
*/
void emitter::emitBegCG(Compiler *comp,
COMP_HANDLE cmpHandle)
{
emitComp = comp;
emitCmpHandle = cmpHandle;
}
void emitter::emitEndCG()
{
}
/*****************************************************************************
*
* Prepare the given IG for emission of code.
*/
void emitter::emitGenIG(insGroup *ig)
{
/* Set the "current IG" value */
emitCurIG = ig;
#if EMIT_TRACK_STACK_DEPTH
/* Record the stack level on entry to this group */
ig->igStkLvl = emitCurStackLvl;
// If we don't have enough bits in igStkLvl, refuse to compile
if (ig->igStkLvl != emitCurStackLvl)
IMPL_LIMITATION("Too many arguments pushed on stack");
// printf("Start IG #%02u [stk=%02u]\n", ig->igNum, emitCurStackLvl);
#endif
if (emitNoGCIG)
{
ig->igFlags |= IGF_NOGCINTERRUPT;
}
/* Prepare to issue instructions */
emitCurIGinsCnt = 0;
emitCurIGsize = 0;
assert(emitCurIGjmpList == NULL);
/* Allocate the temp instruction buffer if we haven't done so */
if (emitCurIGfreeBase == NULL)
{
emitIGbuffSize = SC_IG_BUFFER_SIZE;
emitCurIGfreeBase = (BYTE*)emitGetMem(emitIGbuffSize);
}
emitCurIGfreeNext = emitCurIGfreeBase;
emitCurIGfreeEndp = emitCurIGfreeBase + emitIGbuffSize;
}
/*****************************************************************************
*
* Finish and save the current IG.
*/
insGroup* emitter::emitSavIG(bool emitAdd)
{
insGroup * ig;
BYTE * id;
size_t sz;
size_t gs;
assert(emitCurIGfreeNext <= emitCurIGfreeEndp);
/* Get hold of the IG descriptor */
ig = emitCurIG; assert(ig);
/* Compute how much code we've generated */
sz = emitCurIGfreeNext - emitCurIGfreeBase;
/* Compute the total size we need to allocate */
gs = roundUp(sz);
/* Do we need space for GC? */
if (!(ig->igFlags & IGF_EMIT_ADD))
{
/* Is the initial set of live GC vars different from the previous one? */
if (emitForceStoreGCState || !VarSetOps::Equal(emitComp, emitPrevGCrefVars, emitInitGCrefVars))
{
/* Remember that we will have a new set of live GC variables */
ig->igFlags |= IGF_GC_VARS;
#if EMITTER_STATS
emitTotalIGptrs++;
#endif
/* We'll allocate extra space to record the liveset */
gs += sizeof(VARSET_TP);
}
/* Is the initial set of live Byref regs different from the previous one? */
/* Remember that we will have a new set of live GC variables */
ig->igFlags |= IGF_BYREF_REGS;
/* We'll allocate extra space (DWORD aligned) to record the GC regs */
gs += sizeof(int);
}
/* Allocate space for the instructions and optional liveset */
id = (BYTE*)emitGetMem(gs);
/* Do we need to store the byref regs */
if (ig->igFlags & IGF_BYREF_REGS)
{
/* Record the byref regs in front the of the instructions */
*castto(id, unsigned *)++ = (unsigned) emitInitByrefRegs;
}
/* Do we need to store the liveset? */
if (ig->igFlags & IGF_GC_VARS)
{
/* Record the liveset in front the of the instructions */
VarSetOps::AssignNoCopy(emitComp, (*castto(id, VARSET_TP *)), VarSetOps::MakeEmpty(emitComp));
VarSetOps::Assign(emitComp, (*castto(id, VARSET_TP *)++), emitInitGCrefVars);
}
/* Record the collected instructions */
assert((ig->igFlags & IGF_PLACEHOLDER) == 0);
ig->igData = id;
memcpy(id, emitCurIGfreeBase, sz);
#ifdef DEBUG
if (false && emitComp->verbose) // this is not useful in normal dumps (hence it is normally under if (false)
{
// If there's an error during emission, we may want to connect the post-copy address
// of an instrDesc with the pre-copy address (the one that was originally created). This
// printing enables that.
printf("copying instruction group from [0x%x..0x%x) to [0x%x..0x%x).\n",
dspPtr(emitCurIGfreeBase), dspPtr(emitCurIGfreeBase+sz), dspPtr(id), dspPtr(id+sz));
}
#endif
/* Record how many instructions and bytes of code this group contains */
noway_assert((BYTE)emitCurIGinsCnt == emitCurIGinsCnt);
noway_assert((unsigned short)emitCurIGsize == emitCurIGsize);
ig->igInsCnt = (BYTE)emitCurIGinsCnt;
ig->igSize = (unsigned short)emitCurIGsize;
emitCurCodeOffset += emitCurIGsize;
assert(IsCodeAligned(emitCurCodeOffset));
#if EMITTER_STATS
emitTotalIGicnt += emitCurIGinsCnt;
emitTotalIGsize += sz;
emitSizeMethod += sz;
#endif
// printf("Group [%08X]%3u has %2u instructions (%4u bytes at %08X)\n", ig, ig->igNum, emitCurIGinsCnt, sz, id);
/* Record the live GC register set - if and only if it is not an emitter added block */
if (!(ig->igFlags & IGF_EMIT_ADD))
{
ig->igGCregs = (regMaskSmall)emitInitGCrefRegs;
}
if (!emitAdd)
{
/* Update the previous recorded live GC ref sets, but not if
if we are starting an "overflow" buffer. Note that this is
only used to determine whether we need to store or not store
the GC ref sets for the next IG, which is dependent on exactly
what the state of the emitter GC ref sets will be when the
next IG is processed in the emitter.
*/
VarSetOps::Assign(emitComp, emitPrevGCrefVars, emitThisGCrefVars);
emitPrevGCrefRegs = emitThisGCrefRegs;
emitPrevByrefRegs = emitThisByrefRegs;
emitForceStoreGCState = false;
}
#ifdef DEBUG
if (emitComp->opts.dspCode)
{
printf("\n G_M%03u_IG%02u:", Compiler::s_compMethodsCount, ig->igNum);
if (emitComp->verbose)
{
printf(" ; offs=%06XH, funclet=%02u", ig->igOffs, ig->igFuncIdx);
}
else
{
printf(" ; funclet=%02u", ig->igFuncIdx);
}
printf("\n");
}
#endif
/* Did we have any jumps in this group? */
if (emitCurIGjmpList)
{
instrDescJmp * list = NULL;
instrDescJmp * last = NULL;
/* Move jumps to the global list, update their 'next' links */
do
{
/* Grab the jump and remove it from the list */
instrDescJmp* oj = emitCurIGjmpList;
emitCurIGjmpList = oj->idjNext;
/* Figure out the address of where the jump got copied */
size_t of = (BYTE*)oj - emitCurIGfreeBase;
instrDescJmp* nj = (instrDescJmp*)(ig->igData + of);
// printf("Jump moved from %08X to %08X\n", oj, nj);
// printf("jmp [%08X] at %08X + %03u\n", nj, ig, nj->idjOffs);
assert(nj->idjIG == ig);
assert(nj->idIns() == oj->idIns());
assert(nj->idjNext == oj->idjNext);
/* Make sure the jumps are correctly ordered */
assert(last == NULL || last->idjOffs > nj->idjOffs);
if (ig->igFlags & IGF_FUNCLET_PROLOG)
{
// Our funclet prologs have short jumps, if the prolog would ever have
// long jumps, then we'd have to insert the list in sorted order than
// just append to the emitJumpList.
noway_assert(nj->idjShort);
if (nj->idjShort)
{
continue;
}
}
/* Append the new jump to the list */
nj->idjNext = list;
list = nj;
if (last == NULL)
{
last = nj;
}
}
while (emitCurIGjmpList);
if (last != NULL)
{
/* Append the jump(s) from this IG to the global list */
bool prologJump = (ig == emitPrologIG);
if ((emitJumpList == NULL) || prologJump)
{
last->idjNext = emitJumpList;
emitJumpList = list;
}
else
{
last->idjNext = NULL;
emitJumpLast->idjNext = list;
}
if (!prologJump || (emitJumpLast == NULL))
{
emitJumpLast = last;
}
}
}
/* Fix the last instruction field */
if (sz != 0)
{
assert(emitLastIns != nullptr);
assert(emitCurIGfreeBase <= (BYTE*)emitLastIns);
assert( (BYTE*)emitLastIns < emitCurIGfreeBase + sz);
emitLastIns = (instrDesc*)((BYTE*)id + ((BYTE*)emitLastIns - (BYTE*)emitCurIGfreeBase));
}
/* Reset the buffer free pointers */
emitCurIGfreeNext = emitCurIGfreeBase;
return ig;
}
#ifdef LEGACY_BACKEND
void emitter::emitTmpSizeChanged(unsigned tmpSize)
{
assert(emitGrowableMaxByteOffs <= SCHAR_MAX);
#ifdef DEBUG
// Workaround for FP code
static ConfigDWORD fMaxTempAssert;
bool bAssert = fMaxTempAssert.val(CLRConfig::INTERNAL_JITMaxTempAssert)?true:false;
if (tmpSize > emitMaxTmpSize && bAssert)
{
// TODO-Review: We have a known issue involving floating point code and this assert.
// The generated code will be ok, This is only a warning.
// To not receive this assert again you can set the registry key: JITMaxTempAssert=0.
//
assert(!"Incorrect max tmp size set.");
}
#endif
if (tmpSize <= emitMaxTmpSize)
return;
unsigned change = tmpSize - emitMaxTmpSize;
/* If we have used a small offset to access a variable, growing the
temp size is a problem if we should have used a large offset instead.
Detect if such a situation happens and bail */
if ( emitGrowableMaxByteOffs <= SCHAR_MAX &&
(emitGrowableMaxByteOffs + change) > SCHAR_MAX)
{
#ifdef DEBUG
if (emitComp->verbose)
printf("Under-estimated var offset encoding size for ins #%Xh\n", emitMaxByteOffsIdNum);
#endif
IMPL_LIMITATION("Should have used large offset to access var");
}
emitMaxTmpSize = tmpSize;
emitGrowableMaxByteOffs += change;
}
#endif // LEGACY_BACKEND
/*****************************************************************************
*
* Start generating code to be scheduled; called once per method.
*/
void emitter::emitBegFN(bool hasFramePtr
#if defined(DEBUG)
, bool chkAlign
#endif
#ifdef LEGACY_BACKEND
, unsigned lclSize
#endif // LEGACY_BACKEND
, unsigned maxTmpSize
)
{
insGroup * ig;
/* Assume we won't need the temp instruction buffer */
emitCurIGfreeBase = NULL;
emitIGbuffSize = 0;
/* Record stack frame info (the temp size is just an estimate) */
emitHasFramePtr = hasFramePtr;
emitMaxTmpSize = maxTmpSize;
#ifdef LEGACY_BACKEND
emitLclSize = lclSize;
emitGrowableMaxByteOffs = 0;
#ifdef DEBUG
emitMaxByteOffsIdNum= (unsigned)-1;
#endif // DEBUG
#endif // LEGACY_BACKEND