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gcinfoencoder.cpp
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
/*****************************************************************************
*
* GC Information Encoding API
*
*/
#include <stdint.h>
#include "gcinfoencoder.h"
#include "targetosarch.h"
#ifdef _DEBUG
#ifndef LOGGING
#define LOGGING
#endif
#endif
#ifndef STANDALONE_BUILD
#include "log.h"
#include "simplerhash.h"
#include "bitposition.h"
#endif
#include "../jit/jitstd/algorithm.h"
#ifdef MEASURE_GCINFO
#define GCINFO_WRITE(writer, val, numBits, counter) \
{ \
writer.Write(val, numBits); \
m_CurrentMethodSize.counter += numBits; \
m_CurrentMethodSize.TotalSize += numBits; \
}
#define GCINFO_WRITE_VARL_U(writer, val, base, counter) \
{ \
size_t __temp = \
writer.EncodeVarLengthUnsigned(val, base); \
m_CurrentMethodSize.counter += __temp; \
m_CurrentMethodSize.TotalSize += __temp; \
}
#define GCINFO_WRITE_VARL_S(writer, val, base, counter) \
{ \
size_t __temp = \
writer.EncodeVarLengthSigned(val, base); \
m_CurrentMethodSize.counter += __temp; \
m_CurrentMethodSize.TotalSize += __temp; \
}
#define GCINFO_WRITE_VECTOR(writer, vector, counter) \
{ \
WriteSlotStateVector(writer, vector); \
for(UINT32 i = 0; i < m_NumSlots; i++) \
{ \
if(!m_SlotTable[i].IsDeleted() && \
!m_SlotTable[i].IsUntracked()) \
{ \
m_CurrentMethodSize.counter++; \
m_CurrentMethodSize.TotalSize++; \
} \
} \
}
#define GCINFO_WRITE_VAR_VECTOR(writer, vector, baseSkip, baseRun, counter) \
{ \
size_t __temp = \
WriteSlotStateVarLengthVector(writer, vector, baseSkip, baseRun); \
m_CurrentMethodSize.counter += __temp; \
m_CurrentMethodSize.TotalSize += __temp; \
}
#else
#define GCINFO_WRITE(writer, val, numBits, counter) \
writer.Write(val, numBits);
#define GCINFO_WRITE_VARL_U(writer, val, base, counter) \
writer.EncodeVarLengthUnsigned(val, base);
#define GCINFO_WRITE_VARL_S(writer, val, base, counter) \
writer.EncodeVarLengthSigned(val, base);
#define GCINFO_WRITE_VECTOR(writer, vector, counter) \
WriteSlotStateVector(writer, vector);
#define GCINFO_WRITE_VAR_VECTOR(writer, vector, baseSkip, baseRun, counter) \
WriteSlotStateVarLengthVector(writer, vector, baseSkip, baseRun);
#endif
#define LOG_GCSLOTDESC_FMT "%s%c%d%s%s%s"
#define LOG_GCSLOTDESC_ARGS(pDesc) (pDesc)->IsRegister() ? "register" \
: GcStackSlotBaseNames[(pDesc)->Slot.Stack.Base], \
(pDesc)->IsRegister() ? ' ' : (pDesc)->Slot.Stack.SpOffset < 0 ? '-' : '+', \
(pDesc)->IsRegister() ? (pDesc)->Slot.RegisterNumber \
: ((pDesc)->Slot.Stack.SpOffset), \
(pDesc)->IsPinned() ? " pinned" : "", \
(pDesc)->IsInterior() ? " interior" : "", \
(pDesc)->IsUntracked() ? " untracked" : ""
#define LOG_REGTRANSITION_FMT "register %u%s%s"
#define LOG_REGTRANSITION_ARGS(RegisterNumber, Flags) \
RegisterNumber, \
(Flags & GC_SLOT_PINNED) ? " pinned" : "", \
(Flags & GC_SLOT_INTERIOR) ? " interior" : ""
#define LOG_STACKTRANSITION_FMT "%s%c%d%s%s%s"
#define LOG_STACKTRANSITION_ARGS(BaseRegister, StackOffset, Flags) \
GcStackSlotBaseNames[BaseRegister], \
((StackOffset) < 0) ? '-' : '+', \
((StackOffset) >= 0) ? (StackOffset) \
: -(StackOffset), \
(Flags & GC_SLOT_PINNED) ? " pinned" : "", \
(Flags & GC_SLOT_INTERIOR) ? " interior" : "", \
(Flags & GC_SLOT_UNTRACKED) ? " untracked" : ""
class BitArray
{
friend class BitArrayIterator;
typedef uint32_t ChunkType;
static constexpr size_t NumBitsPerChunk = sizeof(ChunkType) * CHAR_BIT;
public:
BitArray(IAllocator* pJitAllocator, size_t numBits)
{
const size_t numChunks = (numBits + NumBitsPerChunk - 1) / NumBitsPerChunk;
m_pData = (ChunkType*)pJitAllocator->Alloc(sizeof(ChunkType) * numChunks);
m_pEndData = m_pData + numChunks;
#ifdef MUST_CALL_IALLOCATOR_FREE
m_pJitAllocator = pJitAllocator;
#endif
}
inline void SetBit( size_t pos )
{
size_t element = pos / NumBitsPerChunk;
int bpos = (int)(pos % NumBitsPerChunk);
m_pData[element] |= ((ChunkType)1 << bpos);
}
inline void ClearBit( size_t pos )
{
size_t element = pos / NumBitsPerChunk;
int bpos = (int)(pos % NumBitsPerChunk);
m_pData[element] &= ~((ChunkType)1 << bpos);
}
inline void SetAll()
{
ChunkType* ptr = m_pData;
while(ptr < m_pEndData)
*(ptr++) = ~(ChunkType)0;
}
inline void ClearAll()
{
ChunkType* ptr = m_pData;
while(ptr < m_pEndData)
*(ptr++) = (ChunkType)0;
}
inline void WriteBit( size_t pos, BOOL val)
{
if(val)
SetBit(pos);
else
ClearBit(pos);
}
inline uint32_t ReadBit( size_t pos ) const
{
size_t element = pos / NumBitsPerChunk;
int bpos = (int)(pos % NumBitsPerChunk);
return (m_pData[element] & ((ChunkType)1 << bpos));
}
inline bool operator==(const BitArray &other) const
{
_ASSERTE(other.m_pEndData - other.m_pData == m_pEndData - m_pData);
ChunkType* dest = m_pData;
ChunkType* src = other.m_pData;
return 0 == memcmp(dest, src, (m_pEndData - m_pData) * sizeof(ChunkType));
}
inline int GetHashCode() const
{
const int* src = (const int*)m_pData;
int result = *src++;
while (src < (const int*)m_pEndData)
result = _rotr(result, 5) ^ *src++;
return result;
}
inline BitArray& operator=(const BitArray &other)
{
_ASSERTE(other.m_pEndData - other.m_pData == m_pEndData - m_pData);
ChunkType* dest = m_pData;
ChunkType* src = other.m_pData;
while(dest < m_pEndData)
*(dest++) = *(src++);
return *this;
}
inline BitArray& operator|=(const BitArray &other)
{
_ASSERTE(other.m_pEndData - other.m_pData == m_pEndData - m_pData);
ChunkType* dest = m_pData;
ChunkType* src = other.m_pData;
while(dest < m_pEndData)
*(dest++) |= *(src++);
return *this;
}
#ifdef MUST_CALL_IALLOCATOR_FREE
~BitArray()
{
m_pAllocator->Free( m_pData );
}
#endif
static void* operator new(size_t size, IAllocator* allocator)
{
return allocator->Alloc(size);
}
private:
ChunkType * m_pData;
ChunkType * m_pEndData;
#ifdef MUST_CALL_IALLOCATOR_FREE
IAllocator* m_pJitAllocator;
#endif
};
class BitArrayIterator
{
public:
BitArrayIterator(BitArray* bitArray)
{
m_pCurData = (unsigned *)bitArray->m_pData;
m_pEndData = (unsigned *)bitArray->m_pEndData;
m_curBits = *m_pCurData;
m_curBit = 0;
m_curBase = 0;
GetNext();
}
void operator++(int dummy) //int dummy is c++ for "this is postfix ++"
{
GetNext();
}
void operator++() // prefix ++
{
GetNext();
}
void GetNext()
{
m_curBits -= m_curBit;
while (m_curBits == 0)
{
m_pCurData++;
m_curBase += 32;
if (m_pCurData == m_pEndData)
break;
m_curBits = *m_pCurData;
}
m_curBit = (unsigned)((int)m_curBits & -(int)m_curBits);
}
unsigned operator*()
{
assert(!end() && (m_curBit != 0));
unsigned bitPosition = BitPosition(m_curBit);
return bitPosition + m_curBase;
}
bool end()
{
return (m_pCurData == m_pEndData);
}
private:
unsigned* m_pCurData;
unsigned* m_pEndData;
unsigned m_curBits;
unsigned m_curBit;
unsigned m_curBase;
};
class LiveStateFuncs
{
public:
static int GetHashCode(const BitArray * key)
{
return key->GetHashCode();
}
static bool Equals(const BitArray * k1, const BitArray * k2)
{
return *k1 == *k2;
}
};
class GcInfoNoMemoryException
{
};
class GcInfoHashBehavior
{
public:
static const unsigned s_growth_factor_numerator = 3;
static const unsigned s_growth_factor_denominator = 2;
static const unsigned s_density_factor_numerator = 3;
static const unsigned s_density_factor_denominator = 4;
static const unsigned s_minimum_allocation = 7;
inline static void DECLSPEC_NORETURN NoMemory()
{
throw GcInfoNoMemoryException();
}
};
typedef SimplerHashTable<const BitArray *, LiveStateFuncs, UINT32, GcInfoHashBehavior> LiveStateHashTable;
#ifdef MEASURE_GCINFO
// Fi = fully-interruptible; we count any method that has one or more interruptible ranges
// Pi = partially-interruptible; methods with zero fully-interruptible ranges
GcInfoSize g_FiGcInfoSize;
GcInfoSize g_PiGcInfoSize;
// Number of methods with GcInfo that have SlimHeader
size_t g_NumSlimHeaders = 0;
// Number of methods with GcInfo that have FatHeader
size_t g_NumFatHeaders = 0;
GcInfoSize::GcInfoSize()
{
memset(this, 0, sizeof(*this));
}
GcInfoSize& GcInfoSize::operator+=(const GcInfoSize& other)
{
TotalSize += other.TotalSize;
NumMethods += other.NumMethods;
NumCallSites += other.NumCallSites;
NumRanges += other.NumRanges;
NumRegs += other.NumRegs;
NumStack += other.NumStack;
NumUntracked += other.NumUntracked;
NumTransitions += other.NumTransitions;
SizeOfCode += other.SizeOfCode;
EncInfoSize += other.EncInfoSize;
UntrackedSlotSize += other.UntrackedSlotSize;
NumUntrackedSize += other.NumUntrackedSize;
FlagsSize += other.FlagsSize;
CodeLengthSize += other.CodeLengthSize;
ProEpilogSize += other.ProEpilogSize;
SecObjSize += other.SecObjSize;
GsCookieSize += other.GsCookieSize;
GenericsCtxSize += other.GenericsCtxSize;
PspSymSize += other.PspSymSize;
StackBaseSize += other.StackBaseSize;
ReversePInvokeFrameSize += other.ReversePInvokeFrameSize;
FixedAreaSize += other.FixedAreaSize;
NumCallSitesSize += other.NumCallSitesSize;
NumRangesSize += other.NumRangesSize;
CallSitePosSize += other.CallSitePosSize;
RangeSize += other.RangeSize;
NumRegsSize += other.NumRegsSize;
NumStackSize += other.NumStackSize;
RegSlotSize += other.RegSlotSize;
StackSlotSize += other.StackSlotSize;
CallSiteStateSize += other.CallSiteStateSize;
EhPosSize += other.EhPosSize;
EhStateSize += other.EhStateSize;
ChunkPtrSize += other.ChunkPtrSize;
ChunkMaskSize += other.ChunkMaskSize;
ChunkFinalStateSize += other.ChunkFinalStateSize;
ChunkTransitionSize += other.ChunkTransitionSize;
return *this;
}
void GcInfoSize::Log(DWORD level, const char * header)
{
if(LoggingOn(LF_GCINFO, level))
{
LogSpew(LF_GCINFO, level, header);
LogSpew(LF_GCINFO, level, "---COUNTS---\n");
LogSpew(LF_GCINFO, level, "NumMethods: %zu\n", NumMethods);
LogSpew(LF_GCINFO, level, "NumCallSites: %zu\n", NumCallSites);
LogSpew(LF_GCINFO, level, "NumRanges: %zu\n", NumRanges);
LogSpew(LF_GCINFO, level, "NumRegs: %zu\n", NumRegs);
LogSpew(LF_GCINFO, level, "NumStack: %zu\n", NumStack);
LogSpew(LF_GCINFO, level, "NumUntracked: %zu\n", NumUntracked);
LogSpew(LF_GCINFO, level, "NumTransitions: %zu\n", NumTransitions);
LogSpew(LF_GCINFO, level, "SizeOfCode: %zu\n", SizeOfCode);
LogSpew(LF_GCINFO, level, "EncInfoSize: %zu\n", EncInfoSize);
LogSpew(LF_GCINFO, level, "---SIZES(bits)---\n");
LogSpew(LF_GCINFO, level, "Total: %zu\n", TotalSize);
LogSpew(LF_GCINFO, level, "UntrackedSlot: %zu\n", UntrackedSlotSize);
LogSpew(LF_GCINFO, level, "NumUntracked: %zu\n", NumUntrackedSize);
LogSpew(LF_GCINFO, level, "Flags: %zu\n", FlagsSize);
LogSpew(LF_GCINFO, level, "CodeLength: %zu\n", CodeLengthSize);
LogSpew(LF_GCINFO, level, "Prolog/Epilog: %zu\n", ProEpilogSize);
LogSpew(LF_GCINFO, level, "SecObj: %zu\n", SecObjSize);
LogSpew(LF_GCINFO, level, "GsCookie: %zu\n", GsCookieSize);
LogSpew(LF_GCINFO, level, "PspSym: %zu\n", PspSymSize);
LogSpew(LF_GCINFO, level, "GenericsCtx: %zu\n", GenericsCtxSize);
LogSpew(LF_GCINFO, level, "StackBase: %zu\n", StackBaseSize);
LogSpew(LF_GCINFO, level, "FixedArea: %zu\n", FixedAreaSize);
LogSpew(LF_GCINFO, level, "ReversePInvokeFrame: %zu\n", ReversePInvokeFrameSize);
LogSpew(LF_GCINFO, level, "NumCallSites: %zu\n", NumCallSitesSize);
LogSpew(LF_GCINFO, level, "NumRanges: %zu\n", NumRangesSize);
LogSpew(LF_GCINFO, level, "CallSiteOffsets: %zu\n", CallSitePosSize);
LogSpew(LF_GCINFO, level, "Ranges: %zu\n", RangeSize);
LogSpew(LF_GCINFO, level, "NumRegs: %zu\n", NumRegsSize);
LogSpew(LF_GCINFO, level, "NumStack: %zu\n", NumStackSize);
LogSpew(LF_GCINFO, level, "RegSlots: %zu\n", RegSlotSize);
LogSpew(LF_GCINFO, level, "StackSlots: %zu\n", StackSlotSize);
LogSpew(LF_GCINFO, level, "CallSiteStates: %zu\n", CallSiteStateSize);
LogSpew(LF_GCINFO, level, "EhOffsets: %zu\n", EhPosSize);
LogSpew(LF_GCINFO, level, "EhStates: %zu\n", EhStateSize);
LogSpew(LF_GCINFO, level, "ChunkPointers: %zu\n", ChunkPtrSize);
LogSpew(LF_GCINFO, level, "ChunkMasks: %zu\n", ChunkMaskSize);
LogSpew(LF_GCINFO, level, "ChunkFinalStates: %zu\n", ChunkFinalStateSize);
LogSpew(LF_GCINFO, level, "Transitions: %zu\n", ChunkTransitionSize);
}
}
#endif
GcInfoEncoder::GcInfoEncoder(
ICorJitInfo* pCorJitInfo,
CORINFO_METHOD_INFO* pMethodInfo,
IAllocator* pJitAllocator,
NoMemoryFunction pNoMem
)
: m_Info1( pJitAllocator ),
m_Info2( pJitAllocator ),
m_InterruptibleRanges( pJitAllocator ),
m_LifetimeTransitions( pJitAllocator )
{
#ifdef MEASURE_GCINFO
// This causes multiple complus.log files in JIT64. TODO: consider using ICorJitInfo::logMsg instead.
InitializeLogging();
#endif
_ASSERTE( pCorJitInfo != NULL );
_ASSERTE( pMethodInfo != NULL );
_ASSERTE( pJitAllocator != NULL );
_ASSERTE( pNoMem != NULL );
m_pCorJitInfo = pCorJitInfo;
m_pMethodInfo = pMethodInfo;
m_pAllocator = pJitAllocator;
m_pNoMem = pNoMem;
m_SlotTableSize = m_SlotTableInitialSize;
m_SlotTable = (GcSlotDesc*) m_pAllocator->Alloc( m_SlotTableSize*sizeof(GcSlotDesc) );
m_NumSlots = 0;
#ifdef PARTIALLY_INTERRUPTIBLE_GC_SUPPORTED
m_pCallSites = NULL;
m_pCallSiteSizes = NULL;
m_NumCallSites = 0;
#endif
m_BlockSize = 0;
m_GSCookieStackSlot = NO_GS_COOKIE;
m_GSCookieValidRangeStart = 0;
_ASSERTE(sizeof(m_GSCookieValidRangeEnd) == sizeof(UINT32));
m_GSCookieValidRangeEnd = (UINT32) (-1); // == UINT32.MaxValue
m_PSPSymStackSlot = NO_PSP_SYM;
m_GenericsInstContextStackSlot = NO_GENERICS_INST_CONTEXT;
m_contextParamType = GENERIC_CONTEXTPARAM_NONE;
m_StackBaseRegister = NO_STACK_BASE_REGISTER;
m_SizeOfEditAndContinuePreservedArea = NO_SIZE_OF_EDIT_AND_CONTINUE_PRESERVED_AREA;
#ifdef TARGET_ARM64
m_SizeOfEditAndContinueFixedStackFrame = 0;
#endif
m_ReversePInvokeFrameSlot = NO_REVERSE_PINVOKE_FRAME;
#ifdef TARGET_AMD64
m_WantsReportOnlyLeaf = false;
#elif defined(TARGET_ARM) || defined(TARGET_ARM64) || defined(TARGET_LOONGARCH64) || defined(TARGET_RISCV64)
m_HasTailCalls = false;
#endif // TARGET_AMD64
m_IsVarArg = false;
m_pLastInterruptibleRange = NULL;
#ifdef _DEBUG
m_IsSlotTableFrozen = FALSE;
#endif //_DEBUG
m_CodeLength = 0;
#ifdef FIXED_STACK_PARAMETER_SCRATCH_AREA
m_SizeOfStackOutgoingAndScratchArea = -1;
#endif // FIXED_STACK_PARAMETER_SCRATCH_AREA
}
#ifdef PARTIALLY_INTERRUPTIBLE_GC_SUPPORTED
void GcInfoEncoder::DefineCallSites(UINT32* pCallSites, BYTE* pCallSiteSizes, UINT32 numCallSites)
{
m_pCallSites = pCallSites;
m_pCallSiteSizes = pCallSiteSizes;
m_NumCallSites = numCallSites;
#ifdef _DEBUG
for(UINT32 i=0; i<numCallSites; i++)
{
_ASSERTE(pCallSiteSizes[i] > 0);
_ASSERTE(DENORMALIZE_CODE_OFFSET(NORMALIZE_CODE_OFFSET(pCallSites[i])) == pCallSites[i]);
if(i > 0)
{
UINT32 prevEnd = pCallSites[i-1] + pCallSiteSizes[i-1];
UINT32 curStart = pCallSites[i];
_ASSERTE(curStart >= prevEnd);
}
}
#endif
}
#endif
GcSlotId GcInfoEncoder::GetRegisterSlotId( UINT32 regNum, GcSlotFlags flags )
{
// We could lookup an existing identical slot in the slot table (via some hashtable mechanism).
// We just create duplicates for now.
#ifdef _DEBUG
_ASSERTE( !m_IsSlotTableFrozen );
#endif
if( m_NumSlots == m_SlotTableSize )
{
GrowSlotTable();
}
_ASSERTE( m_NumSlots < m_SlotTableSize );
_ASSERTE( (flags & (GC_SLOT_IS_REGISTER | GC_SLOT_IS_DELETED | GC_SLOT_UNTRACKED)) == 0 );
m_SlotTable[ m_NumSlots ].Slot.RegisterNumber = regNum;
m_SlotTable[ m_NumSlots ].Flags = (GcSlotFlags) (flags | GC_SLOT_IS_REGISTER);
GcSlotId newSlotId;
newSlotId = m_NumSlots++;
return newSlotId;
}
GcSlotId GcInfoEncoder::GetStackSlotId( INT32 spOffset, GcSlotFlags flags, GcStackSlotBase spBase )
{
// We could lookup an existing identical slot in the slot table (via some hashtable mechanism).
// We just create duplicates for now.
#ifdef _DEBUG
_ASSERTE( !m_IsSlotTableFrozen );
#endif
if( m_NumSlots == m_SlotTableSize )
{
GrowSlotTable();
}
_ASSERTE( m_NumSlots < m_SlotTableSize );
// Not valid to reference anything below the current stack pointer
_ASSERTE(GC_SP_REL != spBase || spOffset >= 0);
_ASSERTE( (flags & (GC_SLOT_IS_REGISTER | GC_SLOT_IS_DELETED)) == 0 );
if (!(TargetOS::IsApplePlatform && TargetArchitecture::IsArm64))
{
// the spOffset for the stack slot is required to be pointer size aligned
_ASSERTE((spOffset % TARGET_POINTER_SIZE) == 0);
}
m_SlotTable[ m_NumSlots ].Slot.Stack.SpOffset = spOffset;
m_SlotTable[ m_NumSlots ].Slot.Stack.Base = spBase;
m_SlotTable[ m_NumSlots ].Flags = flags;
GcSlotId newSlotId;
newSlotId = m_NumSlots++;
return newSlotId;
}
void GcInfoEncoder::GrowSlotTable()
{
m_SlotTableSize *= 2;
GcSlotDesc* newSlotTable = (GcSlotDesc*) m_pAllocator->Alloc( m_SlotTableSize * sizeof(GcSlotDesc) );
memcpy( newSlotTable, m_SlotTable, m_NumSlots * sizeof(GcSlotDesc) );
#ifdef MUST_CALL_JITALLOCATOR_FREE
m_pAllocator->Free( m_SlotTable );
#endif
m_SlotTable = newSlotTable;
}
void GcInfoEncoder::WriteSlotStateVector(BitStreamWriter &writer, const BitArray& vector)
{
for(UINT32 i = 0; i < m_NumSlots && !m_SlotTable[i].IsUntracked(); i++)
{
if(!m_SlotTable[i].IsDeleted())
writer.Write(vector.ReadBit(i) ? 1 : 0, 1);
else
_ASSERTE(vector.ReadBit(i) == 0);
}
}
void GcInfoEncoder::DefineInterruptibleRange( UINT32 startInstructionOffset, UINT32 length )
{
UINT32 stopInstructionOffset = startInstructionOffset + length;
UINT32 normStartOffset = NORMALIZE_CODE_OFFSET(startInstructionOffset);
UINT32 normStopOffset = NORMALIZE_CODE_OFFSET(stopInstructionOffset);
// Ranges must not overlap and must be passed sorted by increasing offset
_ASSERTE(
m_pLastInterruptibleRange == NULL ||
normStartOffset >= m_pLastInterruptibleRange->NormStopOffset
);
// Ignore empty ranges
if(normStopOffset > normStartOffset)
{
if(m_pLastInterruptibleRange
&& normStartOffset == m_pLastInterruptibleRange->NormStopOffset)
{
// Merge adjacent ranges
m_pLastInterruptibleRange->NormStopOffset = normStopOffset;
}
else
{
InterruptibleRange range;
range.NormStartOffset = normStartOffset;
range.NormStopOffset = normStopOffset;
m_pLastInterruptibleRange = m_InterruptibleRanges.Append();
*m_pLastInterruptibleRange = range;
}
}
LOG((LF_GCINFO, LL_INFO1000000, "interruptible at %x length %x\n", startInstructionOffset, length));
}
//
// For inputs, pass zero as offset
//
void GcInfoEncoder::SetSlotState(
UINT32 instructionOffset,
GcSlotId slotId,
GcSlotState slotState
)
{
_ASSERTE( (m_SlotTable[ slotId ].Flags & GC_SLOT_UNTRACKED) == 0 );
LifetimeTransition transition;
transition.SlotId = slotId;
transition.CodeOffset = instructionOffset;
transition.BecomesLive = ( slotState == GC_SLOT_LIVE );
transition.IsDeleted = FALSE;
*( m_LifetimeTransitions.Append() ) = transition;
LOG((LF_GCINFO, LL_INFO1000000, LOG_GCSLOTDESC_FMT " %s at %x\n", LOG_GCSLOTDESC_ARGS(&m_SlotTable[slotId]), slotState == GC_SLOT_LIVE ? "live" : "dead", instructionOffset));
}
void GcInfoEncoder::SetIsVarArg()
{
m_IsVarArg = true;
}
void GcInfoEncoder::SetCodeLength( UINT32 length )
{
_ASSERTE( length > 0 );
_ASSERTE( m_CodeLength == 0 || m_CodeLength == length );
m_CodeLength = length;
}
void GcInfoEncoder::SetPrologSize( UINT32 prologSize )
{
_ASSERTE(prologSize != 0);
_ASSERTE(m_GSCookieValidRangeStart == 0 || m_GSCookieValidRangeStart == prologSize);
_ASSERTE(m_GSCookieValidRangeEnd == (UINT32)(-1) || m_GSCookieValidRangeEnd == prologSize+1);
m_GSCookieValidRangeStart = prologSize;
// satisfy asserts that assume m_GSCookieValidRangeStart != 0 ==> m_GSCookieValidRangeStart < m_GSCookieValidRangeEnd
m_GSCookieValidRangeEnd = prologSize+1;
}
void GcInfoEncoder::SetGSCookieStackSlot( INT32 spOffsetGSCookie, UINT32 validRangeStart, UINT32 validRangeEnd )
{
_ASSERTE( spOffsetGSCookie != NO_GS_COOKIE );
_ASSERTE( m_GSCookieStackSlot == NO_GS_COOKIE || m_GSCookieStackSlot == spOffsetGSCookie );
_ASSERTE( validRangeStart < validRangeEnd );
m_GSCookieStackSlot = spOffsetGSCookie;
m_GSCookieValidRangeStart = validRangeStart;
m_GSCookieValidRangeEnd = validRangeEnd;
}
void GcInfoEncoder::SetPSPSymStackSlot( INT32 spOffsetPSPSym )
{
_ASSERTE( spOffsetPSPSym != NO_PSP_SYM );
_ASSERTE( m_PSPSymStackSlot == NO_PSP_SYM || m_PSPSymStackSlot == spOffsetPSPSym );
m_PSPSymStackSlot = spOffsetPSPSym;
}
void GcInfoEncoder::SetGenericsInstContextStackSlot( INT32 spOffsetGenericsContext, GENERIC_CONTEXTPARAM_TYPE type)
{
_ASSERTE( spOffsetGenericsContext != NO_GENERICS_INST_CONTEXT);
_ASSERTE( m_GenericsInstContextStackSlot == NO_GENERICS_INST_CONTEXT || m_GenericsInstContextStackSlot == spOffsetGenericsContext );
m_GenericsInstContextStackSlot = spOffsetGenericsContext;
m_contextParamType = type;
}
void GcInfoEncoder::SetStackBaseRegister( UINT32 regNum )
{
_ASSERTE( regNum != NO_STACK_BASE_REGISTER );
_ASSERTE(DENORMALIZE_STACK_BASE_REGISTER(NORMALIZE_STACK_BASE_REGISTER(regNum)) == regNum);
_ASSERTE( m_StackBaseRegister == NO_STACK_BASE_REGISTER || m_StackBaseRegister == regNum );
#if defined(TARGET_LOONGARCH64)
assert(regNum == 3 || 22 == regNum);
#elif defined(TARGET_RISCV64)
assert(regNum == 2 || 8 == regNum);
#endif
m_StackBaseRegister = regNum;
}
void GcInfoEncoder::SetSizeOfEditAndContinuePreservedArea( UINT32 slots )
{
_ASSERTE( slots != NO_SIZE_OF_EDIT_AND_CONTINUE_PRESERVED_AREA );
_ASSERTE( m_SizeOfEditAndContinuePreservedArea == NO_SIZE_OF_EDIT_AND_CONTINUE_PRESERVED_AREA );
m_SizeOfEditAndContinuePreservedArea = slots;
}
#ifdef TARGET_ARM64
void GcInfoEncoder::SetSizeOfEditAndContinueFixedStackFrame( UINT32 size )
{
m_SizeOfEditAndContinueFixedStackFrame = size;
}
#endif
#ifdef TARGET_AMD64
void GcInfoEncoder::SetWantsReportOnlyLeaf()
{
m_WantsReportOnlyLeaf = true;
}
#elif defined(TARGET_ARM) || defined(TARGET_ARM64) || defined(TARGET_LOONGARCH64) || defined(TARGET_RISCV64)
void GcInfoEncoder::SetHasTailCalls()
{
m_HasTailCalls = true;
}
#endif // TARGET_AMD64
#ifdef FIXED_STACK_PARAMETER_SCRATCH_AREA
void GcInfoEncoder::SetSizeOfStackOutgoingAndScratchArea( UINT32 size )
{
_ASSERTE( size != (UINT32)-1 );
_ASSERTE( m_SizeOfStackOutgoingAndScratchArea == (UINT32)-1 || m_SizeOfStackOutgoingAndScratchArea == size );
m_SizeOfStackOutgoingAndScratchArea = size;
}
#endif // FIXED_STACK_PARAMETER_SCRATCH_AREA
void GcInfoEncoder::SetReversePInvokeFrameSlot(INT32 spOffset)
{
m_ReversePInvokeFrameSlot = spOffset;
}
struct GcSlotDescAndId
{
GcSlotDesc m_SlotDesc;
UINT32 m_SlotId;
};
struct CompareSlotDescAndIdBySlotDesc
{
bool operator()(const GcSlotDescAndId& first, const GcSlotDescAndId& second)
{
const GcSlotDesc* pFirst = &first.m_SlotDesc;
const GcSlotDesc* pSecond = &second.m_SlotDesc;
int firstFlags = pFirst->Flags ^ GC_SLOT_UNTRACKED;
int secondFlags = pSecond->Flags ^ GC_SLOT_UNTRACKED;
// All registers come before all stack slots
// All untracked come last
// Then sort them by flags, ensuring that the least-frequent interior/pinned flag combinations are first
// This is accomplished in the comparison of flags, since we encode IsRegister in the highest flag bit
// And we XOR the UNTRACKED flag to place them last in the second highest flag bit
if( firstFlags != secondFlags )
return firstFlags > secondFlags;
// Then sort them by slot
if( pFirst->IsRegister() )
{
_ASSERTE( pSecond->IsRegister() );
if( pFirst->Slot.RegisterNumber != pSecond->Slot.RegisterNumber )
return pFirst->Slot.RegisterNumber < pSecond->Slot.RegisterNumber;
}
else
{
_ASSERTE( !pSecond->IsRegister() );
if( pFirst->Slot.Stack.SpOffset != pSecond->Slot.Stack.SpOffset )
return pFirst->Slot.Stack.SpOffset < pSecond->Slot.Stack.SpOffset;
// This is arbitrary, but we want to make sure they are considered separate slots
if( pFirst->Slot.Stack.Base != pSecond->Slot.Stack.Base )
return pFirst->Slot.Stack.Base < pSecond->Slot.Stack.Base;
}
// If we get here, the slots are identical
_ASSERTE(!"Duplicate slots definitions found in GC information!");
return false;
}
};
struct CompareLifetimeTransitionsByOffsetThenSlot
{
bool operator()(const GcInfoEncoder::LifetimeTransition& first, const GcInfoEncoder::LifetimeTransition& second)
{
UINT32 firstOffset = first.CodeOffset;
UINT32 secondOffset = second.CodeOffset;
if (firstOffset == secondOffset)
{
return first.SlotId < second.SlotId;
}
else
{
return firstOffset < secondOffset;
}
}
};
struct CompareLifetimeTransitionsBySlot
{
bool operator()(const GcInfoEncoder::LifetimeTransition& first, const GcInfoEncoder::LifetimeTransition& second)
{
UINT32 firstOffset = first.CodeOffset;
UINT32 secondOffset = second.CodeOffset;
_ASSERTE(GetNormCodeOffsetChunk(firstOffset) == GetNormCodeOffsetChunk(secondOffset));
// Sort them by slot
if( first.SlotId != second.SlotId)
{
return first.SlotId < second.SlotId;
}
// Then sort them by code offset
if( firstOffset < secondOffset )
{
return true;
}
else
{
_ASSERTE(( firstOffset > secondOffset ) && "Redundant transitions found in GC info!");
return false;
}
}
};
BitStreamWriter::MemoryBlockList::MemoryBlockList()
: m_head(nullptr),
m_tail(nullptr)
{
}
BitStreamWriter::MemoryBlock* BitStreamWriter::MemoryBlockList::AppendNew(IAllocator* allocator, size_t bytes)
{
auto* memBlock = reinterpret_cast<MemoryBlock*>(allocator->Alloc(sizeof(MemoryBlock) + bytes));
memBlock->m_next = nullptr;
if (m_tail != nullptr)
{
_ASSERTE(m_head != nullptr);
m_tail->m_next = memBlock;
}
else
{
_ASSERTE(m_head == nullptr);
m_head = memBlock;
}
m_tail = memBlock;
return memBlock;
}
void BitStreamWriter::MemoryBlockList::Dispose(IAllocator* allocator)
{
#ifdef MUST_CALL_JITALLOCATOR_FREE
for (MemoryBlock* block = m_head, *next; block != nullptr; block = next)
{
next = block->m_next;
allocator->Free(block);
}
m_head = nullptr;
m_tail = nullptr;
#endif
}
void GcInfoEncoder::FinalizeSlotIds()
{
#ifdef _DEBUG
m_IsSlotTableFrozen = TRUE;
#endif
}
void GcInfoEncoder::Build()
{
#ifdef _DEBUG
_ASSERTE(m_IsSlotTableFrozen || m_NumSlots == 0);
_ASSERTE((1 << NUM_NORM_CODE_OFFSETS_PER_CHUNK_LOG2) == NUM_NORM_CODE_OFFSETS_PER_CHUNK);
char methodName[256];
m_pCorJitInfo->printMethodName(m_pMethodInfo->ftn, methodName, sizeof(methodName));
char className[256];
m_pCorJitInfo->printClassName(m_pCorJitInfo->getMethodClass(m_pMethodInfo->ftn), className, sizeof(className));
LOG((LF_GCINFO, LL_INFO100,
"Entering GcInfoEncoder::Build() for method %s:%s\n",
className, methodName));
#endif
///////////////////////////////////////////////////////////////////////
// Method header
///////////////////////////////////////////////////////////////////////
UINT32 hasGSCookie = (m_GSCookieStackSlot != NO_GS_COOKIE);
UINT32 hasContextParamType = (m_GenericsInstContextStackSlot != NO_GENERICS_INST_CONTEXT);
UINT32 hasReversePInvokeFrame = (m_ReversePInvokeFrameSlot != NO_REVERSE_PINVOKE_FRAME);
BOOL slimHeader = (!m_IsVarArg && !hasGSCookie && (m_PSPSymStackSlot == NO_PSP_SYM) &&
!hasContextParamType && (m_InterruptibleRanges.Count() == 0) && !hasReversePInvokeFrame &&
((m_StackBaseRegister == NO_STACK_BASE_REGISTER) || (NORMALIZE_STACK_BASE_REGISTER(m_StackBaseRegister) == 0))) &&
#ifdef TARGET_AMD64
!m_WantsReportOnlyLeaf &&
#elif defined(TARGET_ARM) || defined(TARGET_ARM64) || defined(TARGET_LOONGARCH64) || defined(TARGET_RISCV64)
!m_HasTailCalls &&
#endif // TARGET_AMD64
(m_SizeOfEditAndContinuePreservedArea == NO_SIZE_OF_EDIT_AND_CONTINUE_PRESERVED_AREA);
// All new code is generated for the latest GCINFO_VERSION.
// So, always encode ReversePInvokeFrameSlot where applicable.
if (slimHeader)
{
// Slim encoding means nothing special, partially interruptible, maybe a default frame register
GCINFO_WRITE(m_Info1, 0, 1, FlagsSize); // Slim encoding
#if defined(TARGET_LOONGARCH64)
assert(m_StackBaseRegister == 22 || 3 == m_StackBaseRegister);
#elif defined(TARGET_RISCV64)
assert(m_StackBaseRegister == 8 || 2 == m_StackBaseRegister);
#endif
GCINFO_WRITE(m_Info1, (m_StackBaseRegister == NO_STACK_BASE_REGISTER) ? 0 : 1, 1, FlagsSize);
}
else
{
GCINFO_WRITE(m_Info1, 1, 1, FlagsSize); // Fat encoding
GCINFO_WRITE(m_Info1, (m_IsVarArg ? 1 : 0), 1, FlagsSize);
GCINFO_WRITE(m_Info1, 0 /* unused - was hasSecurityObject */, 1, FlagsSize);
GCINFO_WRITE(m_Info1, (hasGSCookie ? 1 : 0), 1, FlagsSize);
GCINFO_WRITE(m_Info1, ((m_PSPSymStackSlot != NO_PSP_SYM) ? 1 : 0), 1, FlagsSize);
GCINFO_WRITE(m_Info1, m_contextParamType, 2, FlagsSize);
#if defined(TARGET_LOONGARCH64)
assert(m_StackBaseRegister == 22 || 3 == m_StackBaseRegister);
#elif defined(TARGET_RISCV64)
assert(m_StackBaseRegister == 8 || 2 == m_StackBaseRegister);
#endif
GCINFO_WRITE(m_Info1, ((m_StackBaseRegister != NO_STACK_BASE_REGISTER) ? 1 : 0), 1, FlagsSize);
#ifdef TARGET_AMD64
GCINFO_WRITE(m_Info1, (m_WantsReportOnlyLeaf ? 1 : 0), 1, FlagsSize);
#elif defined(TARGET_ARM) || defined(TARGET_ARM64) || defined(TARGET_LOONGARCH64) || defined(TARGET_RISCV64)
GCINFO_WRITE(m_Info1, (m_HasTailCalls ? 1 : 0), 1, FlagsSize);
#endif // TARGET_AMD64
GCINFO_WRITE(m_Info1, ((m_SizeOfEditAndContinuePreservedArea != NO_SIZE_OF_EDIT_AND_CONTINUE_PRESERVED_AREA) ? 1 : 0), 1, FlagsSize);
GCINFO_WRITE(m_Info1, (hasReversePInvokeFrame ? 1 : 0), 1, FlagsSize);
}
_ASSERTE( m_CodeLength > 0 );
_ASSERTE(DENORMALIZE_CODE_LENGTH(NORMALIZE_CODE_LENGTH(m_CodeLength)) == m_CodeLength);
GCINFO_WRITE_VARL_U(m_Info1, NORMALIZE_CODE_LENGTH(m_CodeLength), CODE_LENGTH_ENCBASE, CodeLengthSize);
if(hasGSCookie)
{
_ASSERTE(!slimHeader);
// Save the valid code range, to be used for determining when GS cookie validation
// should be performed
// Encode an intersection of valid offsets
UINT32 intersectionStart = m_GSCookieValidRangeStart;
UINT32 intersectionEnd = m_GSCookieValidRangeEnd;
_ASSERTE(intersectionStart > 0 && intersectionStart < m_CodeLength);
_ASSERTE(intersectionEnd > 0 && intersectionEnd <= m_CodeLength);