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codeman.cpp
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codeman.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.
// See the LICENSE file in the project root for more information.
// codeman.cpp - a managment class for handling multiple code managers
//
//
#include "common.h"
#include "jitinterface.h"
#include "corjit.h"
#include "jithost.h"
#include "eetwain.h"
#include "eeconfig.h"
#include "excep.h"
#include "appdomain.hpp"
#include "codeman.h"
#include "nibblemapmacros.h"
#include "generics.h"
#include "dynamicmethod.h"
#include "eemessagebox.h"
#include "eventtrace.h"
#include "threadsuspend.h"
#include "exceptionhandling.h"
#include "rtlfunctions.h"
#include "jitperf.h"
#include "shimload.h"
#include "debuginfostore.h"
#include "strsafe.h"
#include "configuration.h"
#ifdef BIT64
#define CHECK_DUPLICATED_STRUCT_LAYOUTS
#include "../debug/daccess/fntableaccess.h"
#endif // BIT64
#ifdef FEATURE_PERFMAP
#include "perfmap.h"
#endif
// Default number of jump stubs in a jump stub block
#define DEFAULT_JUMPSTUBS_PER_BLOCK 32
SPTR_IMPL(EECodeManager, ExecutionManager, m_pDefaultCodeMan);
SPTR_IMPL(EEJitManager, ExecutionManager, m_pEEJitManager);
#ifdef FEATURE_PREJIT
SPTR_IMPL(NativeImageJitManager, ExecutionManager, m_pNativeImageJitManager);
#endif
#ifdef FEATURE_READYTORUN
SPTR_IMPL(ReadyToRunJitManager, ExecutionManager, m_pReadyToRunJitManager);
#endif
#ifndef DACCESS_COMPILE
Volatile<RangeSection *> ExecutionManager::m_CodeRangeList = NULL;
Volatile<LONG> ExecutionManager::m_dwReaderCount = 0;
Volatile<LONG> ExecutionManager::m_dwWriterLock = 0;
#else
SPTR_IMPL(RangeSection, ExecutionManager, m_CodeRangeList);
SVAL_IMPL(LONG, ExecutionManager, m_dwReaderCount);
SVAL_IMPL(LONG, ExecutionManager, m_dwWriterLock);
#endif
#ifndef DACCESS_COMPILE
CrstStatic ExecutionManager::m_JumpStubCrst;
CrstStatic ExecutionManager::m_RangeCrst;
unsigned ExecutionManager::m_normal_JumpStubLookup;
unsigned ExecutionManager::m_normal_JumpStubUnique;
unsigned ExecutionManager::m_normal_JumpStubBlockAllocCount;
unsigned ExecutionManager::m_normal_JumpStubBlockFullCount;
unsigned ExecutionManager::m_LCG_JumpStubLookup;
unsigned ExecutionManager::m_LCG_JumpStubUnique;
unsigned ExecutionManager::m_LCG_JumpStubBlockAllocCount;
unsigned ExecutionManager::m_LCG_JumpStubBlockFullCount;
#endif // DACCESS_COMPILE
#if defined(_TARGET_AMD64_) && !defined(DACCESS_COMPILE) // We don't do this on ARM just amd64
// Support for new style unwind information (to allow OS to stack crawl JIT compiled code).
typedef NTSTATUS (WINAPI* RtlAddGrowableFunctionTableFnPtr) (
PVOID *DynamicTable, PRUNTIME_FUNCTION FunctionTable, ULONG EntryCount,
ULONG MaximumEntryCount, ULONG_PTR rangeStart, ULONG_PTR rangeEnd);
typedef VOID (WINAPI* RtlGrowFunctionTableFnPtr) (PVOID DynamicTable, ULONG NewEntryCount);
typedef VOID (WINAPI* RtlDeleteGrowableFunctionTableFnPtr) (PVOID DynamicTable);
// OS entry points (only exist on Win8 and above)
static RtlAddGrowableFunctionTableFnPtr pRtlAddGrowableFunctionTable;
static RtlGrowFunctionTableFnPtr pRtlGrowFunctionTable;
static RtlDeleteGrowableFunctionTableFnPtr pRtlDeleteGrowableFunctionTable;
static Volatile<bool> RtlUnwindFtnsInited;
// statics for UnwindInfoTable
Crst* UnwindInfoTable::s_pUnwindInfoTableLock = NULL;
Volatile<bool> UnwindInfoTable::s_publishingActive = false;
#if _DEBUG
// Fake functions on Win7 checked build to excercize the code paths, they are no-ops
NTSTATUS WINAPI FakeRtlAddGrowableFunctionTable (
PVOID *DynamicTable, PT_RUNTIME_FUNCTION FunctionTable, ULONG EntryCount,
ULONG MaximumEntryCount, ULONG_PTR rangeStart, ULONG_PTR rangeEnd) { *DynamicTable = (PVOID) 1; return 0; }
VOID WINAPI FakeRtlGrowFunctionTable (PVOID DynamicTable, ULONG NewEntryCount) { }
VOID WINAPI FakeRtlDeleteGrowableFunctionTable (PVOID DynamicTable) {}
#endif
/****************************************************************************/
// initialize the entry points for new win8 unwind info publishing functions.
// return true if the initialize is successful (the functions exist)
bool InitUnwindFtns()
{
CONTRACTL {
NOTHROW;
} CONTRACTL_END;
#ifndef FEATURE_PAL
if (!RtlUnwindFtnsInited)
{
HINSTANCE hNtdll = WszGetModuleHandle(W("ntdll.dll"));
if (hNtdll != NULL)
{
void* growFunctionTable = GetProcAddress(hNtdll, "RtlGrowFunctionTable");
void* deleteGrowableFunctionTable = GetProcAddress(hNtdll, "RtlDeleteGrowableFunctionTable");
void* addGrowableFunctionTable = GetProcAddress(hNtdll, "RtlAddGrowableFunctionTable");
// All or nothing AddGroableFunctionTable is last (marker)
if (growFunctionTable != NULL &&
deleteGrowableFunctionTable != NULL &&
addGrowableFunctionTable != NULL)
{
pRtlGrowFunctionTable = (RtlGrowFunctionTableFnPtr) growFunctionTable;
pRtlDeleteGrowableFunctionTable = (RtlDeleteGrowableFunctionTableFnPtr) deleteGrowableFunctionTable;
pRtlAddGrowableFunctionTable = (RtlAddGrowableFunctionTableFnPtr) addGrowableFunctionTable;
}
// Don't call FreeLibrary(hNtdll) because GetModuleHandle did *NOT* increment the reference count!
}
else
{
#if _DEBUG
pRtlGrowFunctionTable = FakeRtlGrowFunctionTable;
pRtlDeleteGrowableFunctionTable = FakeRtlDeleteGrowableFunctionTable;
pRtlAddGrowableFunctionTable = FakeRtlAddGrowableFunctionTable;
#endif
}
RtlUnwindFtnsInited = true;
}
return (pRtlAddGrowableFunctionTable != NULL);
#else // !FEATURE_PAL
return false;
#endif // !FEATURE_PAL
}
/****************************************************************************/
UnwindInfoTable::UnwindInfoTable(ULONG_PTR rangeStart, ULONG_PTR rangeEnd, ULONG size)
{
STANDARD_VM_CONTRACT;
_ASSERTE(s_pUnwindInfoTableLock->OwnedByCurrentThread());
_ASSERTE((rangeEnd - rangeStart) <= 0x7FFFFFFF);
cTableCurCount = 0;
cTableMaxCount = size;
cDeletedEntries = 0;
iRangeStart = rangeStart;
iRangeEnd = rangeEnd;
hHandle = NULL;
pTable = new T_RUNTIME_FUNCTION[cTableMaxCount];
}
/****************************************************************************/
UnwindInfoTable::~UnwindInfoTable()
{
CONTRACTL {
NOTHROW;
GC_NOTRIGGER;
} CONTRACTL_END;
_ASSERTE(s_publishingActive);
// We do this lock free to because too many places still want no-trigger. It should be OK
// It would be cleaner if we could take the lock (we did not have to be GC_NOTRIGGER)
UnRegister();
delete[] pTable;
}
/*****************************************************************************/
void UnwindInfoTable::Register()
{
_ASSERTE(s_pUnwindInfoTableLock->OwnedByCurrentThread());
EX_TRY
{
hHandle = NULL;
NTSTATUS ret = pRtlAddGrowableFunctionTable(&hHandle, pTable, cTableCurCount, cTableMaxCount, iRangeStart, iRangeEnd);
if (ret != STATUS_SUCCESS)
{
_ASSERTE(!"Failed to publish UnwindInfo (ignorable)");
hHandle = NULL;
STRESS_LOG3(LF_JIT, LL_ERROR, "UnwindInfoTable::Register ERROR %x creating table [%p, %p]\n", ret, iRangeStart, iRangeEnd);
}
else
{
STRESS_LOG3(LF_JIT, LL_INFO100, "UnwindInfoTable::Register Handle: %p [%p, %p]\n", hHandle, iRangeStart, iRangeEnd);
}
}
EX_CATCH
{
hHandle = NULL;
STRESS_LOG2(LF_JIT, LL_ERROR, "UnwindInfoTable::Register Exception while creating table [%p, %p]\n",
iRangeStart, iRangeEnd);
_ASSERTE(!"Failed to publish UnwindInfo (ignorable)");
}
EX_END_CATCH(SwallowAllExceptions)
}
/*****************************************************************************/
void UnwindInfoTable::UnRegister()
{
PVOID handle = hHandle;
hHandle = 0;
if (handle != 0)
{
STRESS_LOG3(LF_JIT, LL_INFO100, "UnwindInfoTable::UnRegister Handle: %p [%p, %p]\n", handle, iRangeStart, iRangeEnd);
pRtlDeleteGrowableFunctionTable(handle);
}
}
/*****************************************************************************/
// Add 'data' to the linked list whose head is pointed at by 'unwindInfoPtr'
//
/* static */
void UnwindInfoTable::AddToUnwindInfoTable(UnwindInfoTable** unwindInfoPtr, PT_RUNTIME_FUNCTION data,
TADDR rangeStart, TADDR rangeEnd)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
}
CONTRACTL_END;
_ASSERTE(data->BeginAddress <= RUNTIME_FUNCTION__EndAddress(data, rangeStart));
_ASSERTE(RUNTIME_FUNCTION__EndAddress(data, rangeStart) <= (rangeEnd-rangeStart));
_ASSERTE(unwindInfoPtr != NULL);
if (!s_publishingActive)
return;
CrstHolder ch(s_pUnwindInfoTableLock);
UnwindInfoTable* unwindInfo = *unwindInfoPtr;
// was the original list null, If so lazy initialize.
if (unwindInfo == NULL)
{
// We can choose the average method size estimate dynamically based on past experience
// 128 is the estimated size of an average method, so we can accurately predict
// how many RUNTIME_FUNCTION entries are in each chunk we allocate.
ULONG size = (ULONG) ((rangeEnd - rangeStart) / 128) + 1;
// To insure the test the growing logic in debug code make the size much smaller.
INDEBUG(size = size / 4 + 1);
unwindInfo = (PTR_UnwindInfoTable)new UnwindInfoTable(rangeStart, rangeEnd, size);
unwindInfo->Register();
*unwindInfoPtr = unwindInfo;
}
_ASSERTE(unwindInfo != NULL); // If new had failed, we would have thrown OOM
_ASSERTE(unwindInfo->cTableCurCount <= unwindInfo->cTableMaxCount);
_ASSERTE(unwindInfo->iRangeStart == rangeStart);
_ASSERTE(unwindInfo->iRangeEnd == rangeEnd);
// Means we had a failure publishing to the OS, in this case we give up
if (unwindInfo->hHandle == NULL)
return;
// Check for the fast path: we are adding the the end of an UnwindInfoTable with space
if (unwindInfo->cTableCurCount < unwindInfo->cTableMaxCount)
{
if (unwindInfo->cTableCurCount == 0 ||
unwindInfo->pTable[unwindInfo->cTableCurCount-1].BeginAddress < data->BeginAddress)
{
// Yeah, we can simply add to the end of table and we are done!
unwindInfo->pTable[unwindInfo->cTableCurCount] = *data;
unwindInfo->cTableCurCount++;
// Add to the function table
pRtlGrowFunctionTable(unwindInfo->hHandle, unwindInfo->cTableCurCount);
STRESS_LOG5(LF_JIT, LL_INFO1000, "AddToUnwindTable Handle: %p [%p, %p] ADDING 0x%xp TO END, now 0x%x entries\n",
unwindInfo->hHandle, unwindInfo->iRangeStart, unwindInfo->iRangeEnd,
data->BeginAddress, unwindInfo->cTableCurCount);
return;
}
}
// OK we need to rellocate the table and reregister. First figure out our 'desiredSpace'
// We could imagine being much more efficient for 'bulk' updates, but we don't try
// because we assume that this is rare and we want to keep the code simple
ULONG usedSpace = unwindInfo->cTableCurCount - unwindInfo->cDeletedEntries;
ULONG desiredSpace = usedSpace * 5 / 4 + 1; // Increase by 20%
// Be more aggresive if we used all of our space;
if (usedSpace == unwindInfo->cTableMaxCount)
desiredSpace = usedSpace * 3 / 2 + 1; // Increase by 50%
STRESS_LOG7(LF_JIT, LL_INFO100, "AddToUnwindTable Handle: %p [%p, %p] SLOW Realloc Cnt 0x%x Max 0x%x NewMax 0x%x, Adding %x\n",
unwindInfo->hHandle, unwindInfo->iRangeStart, unwindInfo->iRangeEnd,
unwindInfo->cTableCurCount, unwindInfo->cTableMaxCount, desiredSpace, data->BeginAddress);
UnwindInfoTable* newTab = new UnwindInfoTable(unwindInfo->iRangeStart, unwindInfo->iRangeEnd, desiredSpace);
// Copy in the entries, removing deleted entries and adding the new entry wherever it belongs
int toIdx = 0;
bool inserted = false; // Have we inserted 'data' into the table
for(ULONG fromIdx = 0; fromIdx < unwindInfo->cTableCurCount; fromIdx++)
{
if (!inserted && data->BeginAddress < unwindInfo->pTable[fromIdx].BeginAddress)
{
STRESS_LOG1(LF_JIT, LL_INFO100, "AddToUnwindTable Inserted at MID position 0x%x\n", toIdx);
newTab->pTable[toIdx++] = *data;
inserted = true;
}
if (unwindInfo->pTable[fromIdx].UnwindData != 0) // A 'non-deleted' entry
newTab->pTable[toIdx++] = unwindInfo->pTable[fromIdx];
}
if (!inserted)
{
STRESS_LOG1(LF_JIT, LL_INFO100, "AddToUnwindTable Inserted at END position 0x%x\n", toIdx);
newTab->pTable[toIdx++] = *data;
}
newTab->cTableCurCount = toIdx;
STRESS_LOG2(LF_JIT, LL_INFO100, "AddToUnwindTable New size 0x%x max 0x%x\n",
newTab->cTableCurCount, newTab->cTableMaxCount);
_ASSERTE(newTab->cTableCurCount <= newTab->cTableMaxCount);
// Unregister the old table
*unwindInfoPtr = 0;
unwindInfo->UnRegister();
// Note that there is a short time when we are not publishing...
// Register the new table
newTab->Register();
*unwindInfoPtr = newTab;
delete unwindInfo;
}
/*****************************************************************************/
/* static */ void UnwindInfoTable::RemoveFromUnwindInfoTable(UnwindInfoTable** unwindInfoPtr, TADDR baseAddress, TADDR entryPoint)
{
CONTRACTL {
NOTHROW;
GC_TRIGGERS;
} CONTRACTL_END;
_ASSERTE(unwindInfoPtr != NULL);
if (!s_publishingActive)
return;
CrstHolder ch(s_pUnwindInfoTableLock);
UnwindInfoTable* unwindInfo = *unwindInfoPtr;
if (unwindInfo != NULL)
{
DWORD relativeEntryPoint = (DWORD)(entryPoint - baseAddress);
STRESS_LOG3(LF_JIT, LL_INFO100, "RemoveFromUnwindInfoTable Removing %p BaseAddress %p rel %x\n",
entryPoint, baseAddress, relativeEntryPoint);
for(ULONG i = 0; i < unwindInfo->cTableCurCount; i++)
{
if (unwindInfo->pTable[i].BeginAddress <= relativeEntryPoint &&
relativeEntryPoint < RUNTIME_FUNCTION__EndAddress(&unwindInfo->pTable[i], unwindInfo->iRangeStart))
{
if (unwindInfo->pTable[i].UnwindData != 0)
unwindInfo->cDeletedEntries++;
unwindInfo->pTable[i].UnwindData = 0; // Mark the entry for deletion
STRESS_LOG1(LF_JIT, LL_INFO100, "RemoveFromUnwindInfoTable Removed entry 0x%x\n", i);
return;
}
}
}
STRESS_LOG2(LF_JIT, LL_WARNING, "RemoveFromUnwindInfoTable COULD NOT FIND %p BaseAddress %p\n",
entryPoint, baseAddress);
}
/****************************************************************************/
// Publish the stack unwind data 'data' which is relative 'baseAddress'
// to the operating system in a way ETW stack tracing can use.
/* static */ void UnwindInfoTable::PublishUnwindInfoForMethod(TADDR baseAddress, PT_RUNTIME_FUNCTION unwindInfo, int unwindInfoCount)
{
STANDARD_VM_CONTRACT;
if (!s_publishingActive)
return;
TADDR entry = baseAddress + unwindInfo->BeginAddress;
RangeSection * pRS = ExecutionManager::FindCodeRange(entry, ExecutionManager::GetScanFlags());
_ASSERTE(pRS != NULL);
if (pRS != NULL)
{
for(int i = 0; i < unwindInfoCount; i++)
AddToUnwindInfoTable(&pRS->pUnwindInfoTable, &unwindInfo[i], pRS->LowAddress, pRS->HighAddress);
}
}
/*****************************************************************************/
/* static */ void UnwindInfoTable::UnpublishUnwindInfoForMethod(TADDR entryPoint)
{
CONTRACTL {
NOTHROW;
GC_TRIGGERS;
} CONTRACTL_END;
if (!s_publishingActive)
return;
RangeSection * pRS = ExecutionManager::FindCodeRange(entryPoint, ExecutionManager::GetScanFlags());
_ASSERTE(pRS != NULL);
if (pRS != NULL)
{
_ASSERTE(pRS->pjit->GetCodeType() == (miManaged | miIL));
if (pRS->pjit->GetCodeType() == (miManaged | miIL))
{
// This cast is justified because only EEJitManager's have the code type above.
EEJitManager* pJitMgr = (EEJitManager*)(pRS->pjit);
CodeHeader * pHeader = pJitMgr->GetCodeHeaderFromStartAddress(entryPoint);
for(ULONG i = 0; i < pHeader->GetNumberOfUnwindInfos(); i++)
RemoveFromUnwindInfoTable(&pRS->pUnwindInfoTable, pRS->LowAddress, pRS->LowAddress + pHeader->GetUnwindInfo(i)->BeginAddress);
}
}
}
#ifdef STUBLINKER_GENERATES_UNWIND_INFO
extern StubUnwindInfoHeapSegment *g_StubHeapSegments;
#endif // STUBLINKER_GENERATES_UNWIND_INFO
extern CrstStatic g_StubUnwindInfoHeapSegmentsCrst;
/*****************************************************************************/
// Publish all existing JIT compiled methods by iterating through the code heap
// Note that because we need to keep the entries in order we have to hold
// s_pUnwindInfoTableLock so that all entries get inserted in the correct order.
// (we rely on heapIterator walking the methods in a heap section in order).
/* static */ void UnwindInfoTable::PublishUnwindInfoForExistingMethods()
{
STANDARD_VM_CONTRACT;
{
// CodeHeapIterator holds the m_CodeHeapCritSec, which insures code heaps don't get deallocated while being walked
EEJitManager::CodeHeapIterator heapIterator(NULL);
// Currently m_CodeHeapCritSec is given the CRST_UNSAFE_ANYMODE flag which allows it to be taken in a GC_NOTRIGGER
// region but also disallows GC_TRIGGERS. We need GC_TRIGGERS because we take another lock. Ideally we would
// fix m_CodeHeapCritSec to not have the CRST_UNSAFE_ANYMODE flag, but I currently reached my threshold for fixing
// contracts.
CONTRACT_VIOLATION(GCViolation);
while(heapIterator.Next())
{
MethodDesc *pMD = heapIterator.GetMethod();
if(pMD)
{
PCODE methodEntry =(PCODE) heapIterator.GetMethodCode();
RangeSection * pRS = ExecutionManager::FindCodeRange(methodEntry, ExecutionManager::GetScanFlags());
_ASSERTE(pRS != NULL);
_ASSERTE(pRS->pjit->GetCodeType() == (miManaged | miIL));
if (pRS != NULL && pRS->pjit->GetCodeType() == (miManaged | miIL))
{
// This cast is justified because only EEJitManager's have the code type above.
EEJitManager* pJitMgr = (EEJitManager*)(pRS->pjit);
CodeHeader * pHeader = pJitMgr->GetCodeHeaderFromStartAddress(methodEntry);
int unwindInfoCount = pHeader->GetNumberOfUnwindInfos();
for(int i = 0; i < unwindInfoCount; i++)
AddToUnwindInfoTable(&pRS->pUnwindInfoTable, pHeader->GetUnwindInfo(i), pRS->LowAddress, pRS->HighAddress);
}
}
}
}
#ifdef STUBLINKER_GENERATES_UNWIND_INFO
// Enumerate all existing stubs
CrstHolder crst(&g_StubUnwindInfoHeapSegmentsCrst);
for (StubUnwindInfoHeapSegment* pStubHeapSegment = g_StubHeapSegments; pStubHeapSegment; pStubHeapSegment = pStubHeapSegment->pNext)
{
// The stubs are in reverse order, so we reverse them so they are in memory order
CQuickArrayList<StubUnwindInfoHeader*> list;
for (StubUnwindInfoHeader *pHeader = pStubHeapSegment->pUnwindHeaderList; pHeader; pHeader = pHeader->pNext)
list.Push(pHeader);
for(int i = (int) list.Size()-1; i >= 0; --i)
{
StubUnwindInfoHeader *pHeader = list[i];
AddToUnwindInfoTable(&pStubHeapSegment->pUnwindInfoTable, &pHeader->FunctionEntry,
(TADDR) pStubHeapSegment->pbBaseAddress, (TADDR) pStubHeapSegment->pbBaseAddress + pStubHeapSegment->cbSegment);
}
}
#endif // STUBLINKER_GENERATES_UNWIND_INFO
}
/*****************************************************************************/
// turn on the publishing of unwind info. Called when the ETW rundown provider
// is turned on.
/* static */ void UnwindInfoTable::PublishUnwindInfo(bool publishExisting)
{
CONTRACTL {
NOTHROW;
GC_TRIGGERS;
} CONTRACTL_END;
if (s_publishingActive)
return;
// If we don't have the APIs we need, give up
if (!InitUnwindFtns())
return;
EX_TRY
{
// Create the lock
Crst* newCrst = new Crst(CrstUnwindInfoTableLock);
if (InterlockedCompareExchangeT(&s_pUnwindInfoTableLock, newCrst, NULL) == NULL)
{
s_publishingActive = true;
if (publishExisting)
PublishUnwindInfoForExistingMethods();
}
else
delete newCrst; // we were in a race and failed, throw away the Crst we made.
} EX_CATCH {
STRESS_LOG1(LF_JIT, LL_ERROR, "Exception happened when doing unwind Info rundown. EIP of last AV = %p\n", g_LastAccessViolationEIP);
_ASSERTE(!"Exception thrown while publishing 'catchup' ETW unwind information");
s_publishingActive = false; // Try to minimize damage.
} EX_END_CATCH(SwallowAllExceptions);
}
#endif // defined(_TARGET_AMD64_) && !defined(DACCESS_COMPILE)
/*-----------------------------------------------------------------------------
This is a listing of which methods uses which synchronization mechanism
in the EEJitManager.
//-----------------------------------------------------------------------------
Setters of EEJitManager::m_CodeHeapCritSec
-----------------------------------------------
allocCode
allocGCInfo
allocEHInfo
allocJumpStubBlock
ResolveEHClause
RemoveJitData
Unload
ReleaseReferenceToHeap
JitCodeToMethodInfo
Need EEJitManager::m_CodeHeapCritSec to be set
-----------------------------------------------
NewCodeHeap
allocCodeRaw
GetCodeHeapList
RemoveCodeHeapFromDomainList
DeleteCodeHeap
AddRangeToJitHeapCache
DeleteJitHeapCache
*/
#if !defined(DACCESS_COMPILE)
EEJitManager::CodeHeapIterator::CodeHeapIterator(LoaderAllocator *pLoaderAllocatorFilter)
: m_lockHolder(&(ExecutionManager::GetEEJitManager()->m_CodeHeapCritSec)), m_Iterator(NULL, 0, NULL, 0)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACTL_END;
m_pHeapList = NULL;
m_pLoaderAllocator = pLoaderAllocatorFilter;
m_pHeapList = ExecutionManager::GetEEJitManager()->GetCodeHeapList();
if(m_pHeapList)
new (&m_Iterator) MethodSectionIterator((const void *)m_pHeapList->mapBase, (COUNT_T)m_pHeapList->maxCodeHeapSize, m_pHeapList->pHdrMap, (COUNT_T)HEAP2MAPSIZE(ROUND_UP_TO_PAGE(m_pHeapList->maxCodeHeapSize)));
};
EEJitManager::CodeHeapIterator::~CodeHeapIterator()
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACTL_END;
}
BOOL EEJitManager::CodeHeapIterator::Next()
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACTL_END;
if(!m_pHeapList)
return FALSE;
while(1)
{
if(!m_Iterator.Next())
{
m_pHeapList = m_pHeapList->GetNext();
if(!m_pHeapList)
return FALSE;
new (&m_Iterator) MethodSectionIterator((const void *)m_pHeapList->mapBase, (COUNT_T)m_pHeapList->maxCodeHeapSize, m_pHeapList->pHdrMap, (COUNT_T)HEAP2MAPSIZE(ROUND_UP_TO_PAGE(m_pHeapList->maxCodeHeapSize)));
}
else
{
BYTE * code = m_Iterator.GetMethodCode();
CodeHeader * pHdr = (CodeHeader *)(code - sizeof(CodeHeader));
m_pCurrent = !pHdr->IsStubCodeBlock() ? pHdr->GetMethodDesc() : NULL;
// LoaderAllocator filter
if (m_pLoaderAllocator && m_pCurrent)
{
LoaderAllocator *pCurrentLoaderAllocator = m_pCurrent->GetLoaderAllocator();
if(pCurrentLoaderAllocator != m_pLoaderAllocator)
continue;
}
return TRUE;
}
}
}
#endif // !DACCESS_COMPILE
#ifndef DACCESS_COMPILE
//---------------------------------------------------------------------------------------
//
// ReaderLockHolder::ReaderLockHolder takes the reader lock, checks for the writer lock
// and either aborts if the writer lock is held, or yields until the writer lock is released,
// keeping the reader lock. This is normally called in the constructor for the
// ReaderLockHolder.
//
// The writer cannot be taken if there are any readers. The WriterLockHolder functions take the
// writer lock and check for any readers. If there are any, the WriterLockHolder functions
// release the writer and yield to wait for the readers to be done.
ExecutionManager::ReaderLockHolder::ReaderLockHolder(HostCallPreference hostCallPreference /*=AllowHostCalls*/)
{
CONTRACTL {
NOTHROW;
if (hostCallPreference == AllowHostCalls) { HOST_CALLS; } else { HOST_NOCALLS; }
GC_NOTRIGGER;
CAN_TAKE_LOCK;
} CONTRACTL_END;
IncCantAllocCount();
FastInterlockIncrement(&m_dwReaderCount);
EE_LOCK_TAKEN(GetPtrForLockContract());
if (VolatileLoad(&m_dwWriterLock) != 0)
{
if (hostCallPreference != AllowHostCalls)
{
// Rats, writer lock is held. Gotta bail. Since the reader count was already
// incremented, we're technically still blocking writers at the moment. But
// the holder who called us is about to call DecrementReader in its
// destructor and unblock writers.
return;
}
YIELD_WHILE ((VolatileLoad(&m_dwWriterLock) != 0));
}
}
//---------------------------------------------------------------------------------------
//
// See code:ExecutionManager::ReaderLockHolder::ReaderLockHolder. This just decrements the reader count.
ExecutionManager::ReaderLockHolder::~ReaderLockHolder()
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACTL_END;
FastInterlockDecrement(&m_dwReaderCount);
DecCantAllocCount();
EE_LOCK_RELEASED(GetPtrForLockContract());
}
//---------------------------------------------------------------------------------------
//
// Returns whether the reader lock is acquired
BOOL ExecutionManager::ReaderLockHolder::Acquired()
{
LIMITED_METHOD_CONTRACT;
return VolatileLoad(&m_dwWriterLock) == 0;
}
ExecutionManager::WriterLockHolder::WriterLockHolder()
{
CONTRACTL {
NOTHROW;
GC_NOTRIGGER;
CAN_TAKE_LOCK;
} CONTRACTL_END;
_ASSERTE(m_dwWriterLock == 0);
// Signal to a debugger that this thread cannot stop now
IncCantStopCount();
IncCantAllocCount();
DWORD dwSwitchCount = 0;
while (TRUE)
{
// While this thread holds the writer lock, we must not try to suspend it
// or allow a profiler to walk its stack
Thread::IncForbidSuspendThread();
FastInterlockIncrement(&m_dwWriterLock);
if (m_dwReaderCount == 0)
break;
FastInterlockDecrement(&m_dwWriterLock);
// Before we loop and retry, it's safe to suspend or hijack and inspect
// this thread
Thread::DecForbidSuspendThread();
__SwitchToThread(0, ++dwSwitchCount);
}
EE_LOCK_TAKEN(GetPtrForLockContract());
}
ExecutionManager::WriterLockHolder::~WriterLockHolder()
{
LIMITED_METHOD_CONTRACT;
FastInterlockDecrement(&m_dwWriterLock);
// Writer lock released, so it's safe again for this thread to be
// suspended or have its stack walked by a profiler
Thread::DecForbidSuspendThread();
DecCantAllocCount();
// Signal to a debugger that it's again safe to stop this thread
DecCantStopCount();
EE_LOCK_RELEASED(GetPtrForLockContract());
}
#else
// For DAC builds, we only care whether the writer lock is held.
// If it is, we will assume the locked data is in an inconsistent
// state and throw. We never actually take the lock.
// Note: Throws
ExecutionManager::ReaderLockHolder::ReaderLockHolder(HostCallPreference hostCallPreference /*=AllowHostCalls*/)
{
SUPPORTS_DAC;
if (m_dwWriterLock != 0)
{
ThrowHR(CORDBG_E_PROCESS_NOT_SYNCHRONIZED);
}
}
ExecutionManager::ReaderLockHolder::~ReaderLockHolder()
{
}
#endif // DACCESS_COMPILE
/*-----------------------------------------------------------------------------
This is a listing of which methods uses which synchronization mechanism
in the ExecutionManager
//-----------------------------------------------------------------------------
==============================================================================
ExecutionManger::ReaderLockHolder and ExecutionManger::WriterLockHolder
Protects the callers of ExecutionManager::GetRangeSection from heap deletions
while walking RangeSections. You need to take a reader lock before reading the
values: m_CodeRangeList and hold it while walking the lists
Uses ReaderLockHolder (allows multiple reeaders with no writers)
-----------------------------------------
ExecutionManager::FindCodeRange
ExecutionManager::FindZapModule
ExecutionManager::EnumMemoryRegions
Uses WriterLockHolder (allows single writer and no readers)
-----------------------------------------
ExecutionManager::AddRangeHelper
ExecutionManager::DeleteRangeHelper
*/
//-----------------------------------------------------------------------------
#if defined(_TARGET_ARM_) || defined(_TARGET_ARM64_)
#define EXCEPTION_DATA_SUPPORTS_FUNCTION_FRAGMENTS
#endif
#if defined(EXCEPTION_DATA_SUPPORTS_FUNCTION_FRAGMENTS)
// The function fragments can be used in Hot/Cold splitting, expressing Large Functions or in 'ShrinkWrapping', which is
// delaying saving and restoring some callee-saved registers later inside the body of the method.
// (It's assumed that JIT will not emit any ShrinkWrapping-style methods)
// For these cases multiple RUNTIME_FUNCTION entries (a.k.a function fragments) are used to define
// all the regions of the function or funclet. And one of these function fragments cover the beginning of the function/funclet,
// including the prolog section and is referred as the 'Host Record'.
// This function returns TRUE if the inspected RUNTIME_FUNCTION entry is NOT a host record
BOOL IsFunctionFragment(TADDR baseAddress, PTR_RUNTIME_FUNCTION pFunctionEntry)
{
LIMITED_METHOD_DAC_CONTRACT;
_ASSERTE((pFunctionEntry->UnwindData & 3) == 0); // The unwind data must be an RVA; we don't support packed unwind format
DWORD unwindHeader = *(PTR_DWORD)(baseAddress + pFunctionEntry->UnwindData);
_ASSERTE((0 == ((unwindHeader >> 18) & 3)) || !"unknown unwind data format, version != 0");
#if defined(_TARGET_ARM_)
// On ARM, It's assumed that the prolog is always at the beginning of the function and cannot be split.
// Given that, there are 4 possible ways to fragment a function:
// 1. Prolog only:
// 2. Prolog and some epilogs:
// 3. Epilogs only:
// 4. No Prolog or epilog
//
// Function fragments describing 1 & 2 are host records, 3 & 4 are not.
// for 3 & 4, the .xdata record's F bit is set to 1, marking clearly what is NOT a host record
_ASSERTE((pFunctionEntry->BeginAddress & THUMB_CODE) == THUMB_CODE); // Sanity check: it's a thumb address
DWORD Fbit = (unwindHeader >> 22) & 0x1; // F "fragment" bit
return (Fbit == 1);
#elif defined(_TARGET_ARM64_)
// ARM64 is a little bit more flexible, in the sense that it supports partial prologs. However only one of the
// prolog regions are allowed to alter SP and that's the Host Record. Partial prologs are used in ShrinkWrapping
// scenarios which is not supported, hence we don't need to worry about them. discarding partial prologs
// simplifies identifying a host record a lot.
//
// 1. Prolog only: The host record. Epilog Count and E bit are all 0.
// 2. Prolog and some epilogs: The host record with accompanying epilog-only records
// 3. Epilogs only: First unwind code is Phantom prolog (Starting with an end_c, indicating an empty prolog)
// 4. No prologs or epilogs: First unwind code is Phantom prolog (Starting with an end_c, indicating an empty prolog)
//
int EpilogCount = (int)(unwindHeader >> 22) & 0x1F;
int CodeWords = unwindHeader >> 27;
PTR_DWORD pUnwindCodes = (PTR_DWORD)(baseAddress + pFunctionEntry->UnwindData);
// Skip header.
pUnwindCodes++;
// Skip extended header.
if ((CodeWords == 0) && (EpilogCount == 0))
{
EpilogCount = (*pUnwindCodes) & 0xFFFF;
pUnwindCodes++;
}
// Skip epilog scopes.
BOOL Ebit = (unwindHeader >> 21) & 0x1;
if (!Ebit && (EpilogCount != 0))
{
// EpilogCount is the number of exception scopes defined right after the unwindHeader
pUnwindCodes += EpilogCount;
}
return ((*pUnwindCodes & 0xFF) == 0xE5);
#else
PORTABILITY_ASSERT("IsFunctionFragnent - NYI on this platform");
#endif
}
// When we have fragmented unwind we usually want to refer to the
// unwind record that includes the prolog. We can find it by searching
// back in the sequence of unwind records.
PTR_RUNTIME_FUNCTION FindRootEntry(PTR_RUNTIME_FUNCTION pFunctionEntry, TADDR baseAddress)
{
LIMITED_METHOD_DAC_CONTRACT;
PTR_RUNTIME_FUNCTION pRootEntry = pFunctionEntry;
if (pRootEntry != NULL)
{
// Walk backwards in the RUNTIME_FUNCTION array until we find a non-fragment.
// We're guaranteed to find one, because we require that a fragment live in a function or funclet
// that has a prolog, which will have non-fragment .xdata.
for (;;)
{
if (!IsFunctionFragment(baseAddress, pRootEntry))
{
// This is not a fragment; we're done
break;
}
--pRootEntry;
}
}
return pRootEntry;
}
#endif // EXCEPTION_DATA_SUPPORTS_FUNCTION_FRAGMENTS
#ifndef DACCESS_COMPILE
//**********************************************************************************
// IJitManager
//**********************************************************************************
IJitManager::IJitManager()
{
LIMITED_METHOD_CONTRACT;
m_runtimeSupport = ExecutionManager::GetDefaultCodeManager();
}
#endif // #ifndef DACCESS_COMPILE
// When we unload an appdomain, we need to make sure that any threads that are crawling through
// our heap or rangelist are out. For cooperative-mode threads, we know that they will have
// been stopped when we suspend the EE so they won't be touching an element that is about to be deleted.
// However for pre-emptive mode threads, they could be stalled right on top of the element we want
// to delete, so we need to apply the reader lock to them and wait for them to drain.
ExecutionManager::ScanFlag ExecutionManager::GetScanFlags()
{
CONTRACTL {
NOTHROW;
GC_NOTRIGGER;
HOST_NOCALLS;
SUPPORTS_DAC;
} CONTRACTL_END;
#if !defined(DACCESS_COMPILE) && !defined(CROSSGEN_COMPILE)
BEGIN_GETTHREAD_ALLOWED;
Thread *pThread = GetThread();
if (!pThread)
return ScanNoReaderLock;
// If this thread is hijacked by a profiler and crawling its own stack,
// we do need to take the lock
if (pThread->GetProfilerFilterContext() != NULL)
return ScanReaderLock;
if (pThread->PreemptiveGCDisabled() || (pThread == ThreadSuspend::GetSuspensionThread()))
return ScanNoReaderLock;
END_GETTHREAD_ALLOWED;
return ScanReaderLock;
#else
return ScanNoReaderLock;
#endif
}
#ifdef DACCESS_COMPILE
void IJitManager::EnumMemoryRegions(CLRDataEnumMemoryFlags flags)
{
DAC_ENUM_VTHIS();
if (m_runtimeSupport.IsValid())
{
m_runtimeSupport->EnumMemoryRegions(flags);
}
}
#endif // #ifdef DACCESS_COMPILE
#if defined(FEATURE_EH_FUNCLETS)
PTR_VOID GetUnwindDataBlob(TADDR moduleBase, PTR_RUNTIME_FUNCTION pRuntimeFunction, /* out */ SIZE_T * pSize)
{
LIMITED_METHOD_CONTRACT;
#if defined(_TARGET_AMD64_)
PTR_UNWIND_INFO pUnwindInfo(dac_cast<PTR_UNWIND_INFO>(moduleBase + RUNTIME_FUNCTION__GetUnwindInfoAddress(pRuntimeFunction)));