d4708
/
source-engine
mirror of https://github.com/nillerusr/source-engine.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
47 Commits
25 Branches
6 Tags
221 MiB
Tree: cbffd53f8b
Branches Tags
${ item.name }
Create tag ${ searchTerm }
Create branch ${ searchTerm }
from 'cbffd53f8b'
${ noResults }
source-engine/vstdlib/coroutine.cpp

1162 lines
37 KiB
Raw Normal View History Unescape

1
5 years ago
//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// Build Notes: In order for the coroutine system to work a few build options
// need to be set for coroutine.cpp itself. These are the VPC
// entries for those options:
// $Compiler
// {
// $EnableC++Exceptions "No"
// $BasicRuntimeChecks "Default"
// $EnableFloatingPointExceptions "No"
// }
//
// If you have not set these options you will get a strange popup in
// Visual Studio at the end of Coroutine_Continue().
//
//=============================================================================
//#include "pch_vstdlib.h"
#if defined(_DEBUG)
// Verify that something is false
#define DbgVerifyNot(x) Assert(!x)
#else
#define DbgVerifyNot(x) x
#endif
#include "vstdlib/coroutine.h"
#include "tier0/vprof.h"
#include "tier0/minidump.h"
#include "tier1/utllinkedlist.h"
#include "tier1/utlvector.h"
#include <setjmp.h>
// for debugging
//#define CHECK_STACK_CORRUPTION
#ifndef STEAM
#define PvAlloc(x) malloc(x)
#define FreePv(x) free(x)
#endif
#ifdef CHECK_STACK_CORRUPTION
#include "tier1/checksum_md5.h"
#include "../tier1/checksum_md5.cpp"
#endif // CHECK_STACK_CORRUPTION
//#define COROUTINE_TRACE
#ifdef COROUTINE_TRACE
#include "tier1/fmtstr.h"
static CFmtStr g_fmtstr;
#ifdef WIN32
extern "C" __declspec(dllimport) void __stdcall OutputDebugStringA( const char * );
#else
void OutputDebugStringA( const char *pchMsg ) { fprintf( stderr, pchMsg ); fflush( stderr ); }
#endif
#define CoroutineDbgMsg( fmt, ... ) \
{ \
g_fmtstr.sprintf( fmt, ##__VA_ARGS__ ); \
OutputDebugStringA( g_fmtstr ); \
}
#else
#define CoroutineDbgMsg( pchMsg, ... )
#endif // COROUTINE_TRACE
// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"
#if defined( _MSC_VER ) && ( _MSC_VER >= 1900 ) && defined( PLATFORM_64BITS )
//the VS2105 longjmp() seems to freak out jumping back into a coroutine (just like linux if _FORTIFY_SOURCE is defined)
// I can't find an analogy to _FORTIFY_SOURCE for MSVC at the moment, so I wrote a quick assembly to longjmp() without any safety checks
extern "C" NORETURN void Coroutine_LongJmp_Unchecked( jmp_buf buffer, int nResult );
#define Coroutine_longjmp Coroutine_LongJmp_Unchecked
#ifdef _WIN64
#define Q_offsetof(s,m) (size_t)( (ptrdiff_t)&reinterpret_cast<const volatile char&>((((s *)0)->m)) )
#else
#define Q_offsetof(s,m) (size_t)&reinterpret_cast<const volatile char&>((((s *)0)->m))
#endif
#define SIZEOF_MEMBER( className, memberName ) sizeof( ((className*)nullptr)->memberName )
#define Validate_Jump_Buffer( _Member ) COMPILE_TIME_ASSERT( (Q_offsetof( _JUMP_BUFFER, _Member ) == Q_offsetof( _Duplicate_JUMP_BUFFER, _Member )) && (SIZEOF_MEMBER( _JUMP_BUFFER, _Member ) == SIZEOF_MEMBER( _Duplicate_JUMP_BUFFER, _Member )) )
//validate that the structure in assembly matches what the crt setjmp thinks it is
# if defined( PLATFORM_64BITS )
struct _Duplicate_JUMP_BUFFER
{
unsigned __int64 Frame;
unsigned __int64 Rbx;
unsigned __int64 Rsp;
unsigned __int64 Rbp;
unsigned __int64 Rsi;
unsigned __int64 Rdi;
unsigned __int64 R12;
unsigned __int64 R13;
unsigned __int64 R14;
unsigned __int64 R15;
unsigned __int64 Rip;
unsigned long MxCsr;
unsigned short FpCsr;
unsigned short Spare;
SETJMP_FLOAT128 Xmm6;
SETJMP_FLOAT128 Xmm7;
SETJMP_FLOAT128 Xmm8;
SETJMP_FLOAT128 Xmm9;
SETJMP_FLOAT128 Xmm10;
SETJMP_FLOAT128 Xmm11;
SETJMP_FLOAT128 Xmm12;
SETJMP_FLOAT128 Xmm13;
SETJMP_FLOAT128 Xmm14;
SETJMP_FLOAT128 Xmm15;
};
COMPILE_TIME_ASSERT( sizeof( _JUMP_BUFFER ) == sizeof( _Duplicate_JUMP_BUFFER ) );
Validate_Jump_Buffer( Frame );
Validate_Jump_Buffer( Rbx );
Validate_Jump_Buffer( Rsp );
Validate_Jump_Buffer( Rbp );
Validate_Jump_Buffer( Rsi );
Validate_Jump_Buffer( Rdi );
Validate_Jump_Buffer( R12 );
Validate_Jump_Buffer( R13 );
Validate_Jump_Buffer( R14 );
Validate_Jump_Buffer( R15 );
Validate_Jump_Buffer( Rip );
Validate_Jump_Buffer( MxCsr );
Validate_Jump_Buffer( FpCsr );
Validate_Jump_Buffer( Spare );
Validate_Jump_Buffer( Xmm6 );
Validate_Jump_Buffer( Xmm7 );
Validate_Jump_Buffer( Xmm8 );
Validate_Jump_Buffer( Xmm9 );
Validate_Jump_Buffer( Xmm10 );
Validate_Jump_Buffer( Xmm11 );
Validate_Jump_Buffer( Xmm12 );
Validate_Jump_Buffer( Xmm13 );
Validate_Jump_Buffer( Xmm14 );
Validate_Jump_Buffer( Xmm15 );
# else
struct _Duplicate_JUMP_BUFFER
{
unsigned long Ebp;
unsigned long Ebx;
unsigned long Edi;
unsigned long Esi;
unsigned long Esp;
unsigned long Eip;
unsigned long Registration;
unsigned long TryLevel;
unsigned long Cookie;
unsigned long UnwindFunc;
unsigned long UnwindData[6];
};
COMPILE_TIME_ASSERT( sizeof( _JUMP_BUFFER ) == sizeof( _Duplicate_JUMP_BUFFER ) );
Validate_Jump_Buffer( Ebp );
Validate_Jump_Buffer( Ebx );
Validate_Jump_Buffer( Edi );
Validate_Jump_Buffer( Esi );
Validate_Jump_Buffer( Esp );
Validate_Jump_Buffer( Eip );
Validate_Jump_Buffer( Registration );
Validate_Jump_Buffer( TryLevel );
Validate_Jump_Buffer( Cookie );
Validate_Jump_Buffer( UnwindFunc );
Validate_Jump_Buffer( UnwindData[6] );
# endif
#else
#define Coroutine_longjmp longjmp
#endif
// it *feels* like we should need barriers around our setjmp/longjmp calls, and the memcpy's
// to make sure the optimizer doesn't reorder us across register load/stores, so I've put them
// in what seem like the appropriate spots, but we seem to run ok without them, so...
#ifdef GNUC
#define RW_MEMORY_BARRIER /* __sync_synchronize() */
#else
#define RW_MEMORY_BARRIER /* _ReadWriteBarrier() */
#endif
// return values from setjmp()
static const int k_iSetJmpStateSaved = 0x00;
static const int k_iSetJmpContinue = 0x01;
static const int k_iSetJmpDone = 0x02;
static const int k_iSetJmpDbgBreak = 0x03;
// distance up the stack that coroutine functions stacks' start
#ifdef _PS3
// PS3 has a small stack. Hopefully we dont need 64k of padding!
static const int k_cubCoroutineStackGap = (3 * 1024);
static const int k_cubCoroutineStackGapSmall = 64;
#else
static const int k_cubCoroutineStackGap = (64 * 1024);
static const int k_cubCoroutineStackGapSmall = 64;
#endif
// Warning size for allocated stacks
#ifdef _DEBUG
// In debug builds, we'll end up with much more stack usage in some scenarios that isn't representative of release
// builds. We should still warn if we're going way above what we could expect the optimizer to save us from, but the
// warning is more salient in release.
static const int k_cubMaxCoroutineStackSize = (48 * 1024);
#else
static const int k_cubMaxCoroutineStackSize = (32 * 1024);
#endif // defined( _DEBUG )
#ifdef _WIN64
extern "C" byte *GetStackPtr64();
#define GetStackPtr( pStackPtr) byte *pStackPtr = GetStackPtr64();
#else
#ifdef WIN32
#define GetStackPtr( pStackPtr ) byte *pStackPtr; __asm mov pStackPtr, esp
#elif defined(GNUC)
// Apple's version of gcc/g++ doesn't return the expected value using the intrinsic, so
// do it the old fashioned way - this will also use asm on linux (since we don't compile
// with llvm/clang there) but that seems fine.
#if defined(__llvm__) || defined(__clang__)
#define GetStackPtr( pStackPtr ) byte *pStackPtr = (byte*)__builtin_frame_address(0)
#else
First steps
4 years ago
#if defined(__arm__)
#define GetStackPtr( pStackPtr ) byte *pStackPtr = (byte*)__builtin_frame_address(0)
#else
1
5 years ago
#define GetStackPtr( pStackPtr ) register byte *pStackPtr __asm__( "esp" )
#endif
First steps
4 years ago
#endif
1
5 years ago
#elif defined(__SNC__)
#define GetStackPtr( pStackPtr ) byte *pStackPtr = (byte*)__builtin_frame_address(0)
#else
#error
#endif
#endif
#ifdef _M_X64
#define _REGISTER_ALIGNMENT 16ull
int CalcAlignOffset( const unsigned char *p )
{
return static_cast<int>( AlignValue( p, _REGISTER_ALIGNMENT ) - p );
}
#endif
//-----------------------------------------------------------------------------
// Purpose: single coroutine descriptor
//-----------------------------------------------------------------------------
#if defined( _PS3 ) && defined( _DEBUG )
byte rgStackTempBuffer[65535];
#endif
class CCoroutine
{
public:
CCoroutine()
{
m_pSavedStack = NULL;
m_pStackHigh = m_pStackLow = NULL;
m_cubSavedStack = 0;
m_pFunc = NULL;
m_pchName = "(none)";
m_iJumpCode = 0;
m_pchDebugMsg = NULL;
#ifdef COROUTINE_TRACE
m_hCoroutine = -1;
#endif
#ifdef _M_X64
m_nAlignmentBytes = CalcAlignOffset( m_rgubRegisters );
#endif
#if defined( VPROF_ENABLED )
m_pVProfNodeScope = NULL;
#endif
}
jmp_buf &GetRegisters()
{
#ifdef _M_X64
// Did we get moved in memory in such a way that the registers became unaligned?
// If so, fix them up now
size_t align = _REGISTER_ALIGNMENT - 1;
unsigned char *pRegistersCur = &m_rgubRegisters[m_nAlignmentBytes];
if ( (size_t)pRegistersCur & align )
{
m_nAlignmentBytes = CalcAlignOffset( m_rgubRegisters );
unsigned char *pRegistersNew = &m_rgubRegisters[m_nAlignmentBytes];
Q_memmove( pRegistersNew, pRegistersCur, sizeof(jmp_buf) );
pRegistersCur = pRegistersNew;
}
return *reinterpret_cast<jmp_buf *>( pRegistersCur );
#else
return m_Registers;
#endif
}
~CCoroutine()
{
if ( m_pSavedStack )
{
FreePv( m_pSavedStack );
}
}
FORCEINLINE void RestoreStack()
{
if ( m_cubSavedStack )
{
Assert( m_pStackHigh );
Assert( m_pSavedStack );
#if defined( _PS3 ) && defined( _DEBUG )
// Our (and Sony's) memory tracking tools may try to walk the stack during a free() call
// if we do the free here at our normal point though the stack is invalid since it's in
// the middle of swapping. Instead move it to a temp buffer now and free while the stack
// frames in place are still ok.
Assert( m_cubSavedStack < Q_ARRAYSIZE( rgStackTempBuffer ) );
memcpy( &rgStackTempBuffer[0], m_pSavedStack, m_cubSavedStack );
FreePv( m_pSavedStack );
m_pSavedStack = &rgStackTempBuffer[0];
#endif
// Assert we're not about to trash our own immediate stack
GetStackPtr( pStack );
if ( pStack >= m_pStackLow && pStack <= m_pStackHigh )
{
CoroutineDbgMsg( g_fmtstr.sprintf( "Restoring stack over ESP (%x, %x, %x)\n", pStack, m_pStackLow, m_pStackHigh ) );
AssertMsg3( false, "Restoring stack over ESP (%p, %p, %p)\n", pStack, m_pStackLow, m_pStackHigh );
}
// Make sure we can access the our instance pointer after restoring the stack. This function is inlined, so the compiler could decide to
// use an existing coroutine pointer that is already on the stack from the previous function (does so on the PS3), and will be overwritten
// when we memcpy below. Any allocations here should be ok, as the caller should have advanced the stack past the stack area where the
// new stack will be copied
CCoroutine *pThis = (CCoroutine*)stackalloc( sizeof( CCoroutine* ) );
pThis = this;
RW_MEMORY_BARRIER;
memcpy( m_pStackLow, m_pSavedStack, m_cubSavedStack );
// WARNING: The stack has been replaced.. do not use previous stack variables or this
#ifdef CHECK_STACK_CORRUPTION
MD5Init( &pThis->m_md52 );
MD5Update( &pThis->m_md52, pThis->m_pStackLow, pThis->m_cubSavedStack );
MD5Final( pThis->m_digest2, &pThis->m_md52 );
Assert( 0 == Q_memcmp( pThis->m_digest, pThis->m_digest2, MD5_DIGEST_LENGTH ) );
#endif
// free the saved stack info
pThis->m_cubSavedStack = 0;
#if !defined( _PS3 ) || !defined( _DEBUG )
FreePv( pThis->m_pSavedStack );
#endif
pThis->m_pSavedStack = NULL;
// If we were the "main thread", reset our stack pos to zero
if ( NULL == pThis->m_pFunc )
{
pThis->m_pStackLow = pThis->m_pStackHigh = 0;
}
// resume accounting against the vprof node we were in when we yielded
// Make sure we are added after the coroutine we just copied onto the stack
#if defined( VPROF_ENABLED )
pThis->m_pVProfNodeScope = g_VProfCurrentProfile.GetCurrentNode();
if ( g_VProfCurrentProfile.IsEnabled() )
{
FOR_EACH_VEC_BACK( pThis->m_vecProfNodeStack, i )
{
g_VProfCurrentProfile.EnterScope(
pThis->m_vecProfNodeStack[i]->GetName(),
0,
g_VProfCurrentProfile.GetBudgetGroupName( pThis->m_vecProfNodeStack[i]->GetBudgetGroupID() ),
false,
g_VProfCurrentProfile.GetBudgetGroupFlags( pThis->m_vecProfNodeStack[i]->GetBudgetGroupID() )
);
}
}
pThis->m_vecProfNodeStack.Purge();
#endif
}
}
FORCEINLINE void SaveStack()
{
MEM_ALLOC_CREDIT_( "Coroutine saved stack" );
if ( m_pSavedStack )
{
FreePv( m_pSavedStack );
}
GetStackPtr( pLocal );
m_pStackLow = pLocal;
m_cubSavedStack = (m_pStackHigh - m_pStackLow);
m_pSavedStack = (byte *)PvAlloc( m_cubSavedStack );
// if you hit this assert, it's because you're allocating way too much stuff on the stack in your job
// check you haven't got any overly large string buffers allocated on the stack
Assert( m_cubSavedStack < k_cubMaxCoroutineStackSize );
#if defined( VPROF_ENABLED )
// Exit any current vprof scope when we yield, and remember the vprof stack so we can restore it when we run again
m_vecProfNodeStack.RemoveAll();
CVProfNode *pCurNode = g_VProfCurrentProfile.GetCurrentNode();
while ( pCurNode && m_pVProfNodeScope && pCurNode != m_pVProfNodeScope && pCurNode != g_VProfCurrentProfile.GetRoot() )
{
m_vecProfNodeStack.AddToTail( pCurNode );
g_VProfCurrentProfile.ExitScope();
pCurNode = g_VProfCurrentProfile.GetCurrentNode();
}
m_pVProfNodeScope = NULL;
#endif
RW_MEMORY_BARRIER;
// save the stack in the newly allocated slot
memcpy( m_pSavedStack, m_pStackLow, m_cubSavedStack );
#ifdef CHECK_STACK_CORRUPTION
MD5Init( &m_md5 );
MD5Update( &m_md5, m_pSavedStack, m_cubSavedStack );
MD5Final( m_digest, &m_md5 );
#endif
}
#ifdef DBGFLAG_VALIDATE
void Validate( CValidator &validator, const char *pchName )
{
validator.Push( "CCoroutine", this, pchName );
validator.ClaimMemory( m_pSavedStack );
validator.Pop();
}
#endif
#ifdef _M_X64
unsigned char m_rgubRegisters[sizeof(jmp_buf) + _REGISTER_ALIGNMENT];
int m_nAlignmentBytes;
#else
jmp_buf m_Registers;
#endif
byte *m_pStackHigh; // position of initial entry to the coroutine (stack ptr before continue is ran)
byte *m_pStackLow; // low point on the stack we plan on saving (stack ptr when we yield)
byte *m_pSavedStack; // pointer to the saved stack (allocated on heap)
int m_cubSavedStack; // amount of data on stack
const char *m_pchName;
int m_iJumpCode;
const char *m_pchDebugMsg;
#ifdef COROUTINE_TRACE
HCoroutine m_hCoroutine; // for debugging
#endif
CoroutineFunc_t m_pFunc;
void *m_pvParam;
#if defined( VPROF_ENABLED )
CUtlVector<CVProfNode *> m_vecProfNodeStack;
CVProfNode *m_pVProfNodeScope;
#endif
#ifdef CHECK_STACK_CORRUPTION
MD5Context_t m_md5;
unsigned char m_digest[MD5_DIGEST_LENGTH];
MD5Context_t m_md52;
unsigned char m_digest2[MD5_DIGEST_LENGTH];
#endif
};
//-----------------------------------------------------------------------------
// Purpose: manages list of all coroutines
//-----------------------------------------------------------------------------
class CCoroutineMgr
{
public:
CCoroutineMgr()
{
m_topofexceptionchain = 0;
// reserve the 0 index as the main coroutine
HCoroutine hMainCoroutine = m_ListCoroutines.AddToTail();
m_ListCoroutines[hMainCoroutine].m_pchName = "(main)";
#ifdef COROUTINE_TRACE
m_ListCoroutines[hMainCoroutine].m_hCoroutine = hMainCoroutine;
#endif
// mark it as currently running
m_VecCoroutineStack.AddToTail( hMainCoroutine );
}
HCoroutine CreateCoroutine( CoroutineFunc_t pFunc, void *pvParam )
{
HCoroutine hCoroutine = m_ListCoroutines.AddToTail();
CoroutineDbgMsg( g_fmtstr.sprintf( "Coroutine_Create() hCoroutine = %x pFunc = 0x%x pvParam = 0x%x\n", hCoroutine, pFunc, pvParam ) );
m_ListCoroutines[hCoroutine].m_pFunc = pFunc;
m_ListCoroutines[hCoroutine].m_pvParam = pvParam;
m_ListCoroutines[hCoroutine].m_pSavedStack = NULL;
m_ListCoroutines[hCoroutine].m_cubSavedStack = 0;
m_ListCoroutines[hCoroutine].m_pStackHigh = m_ListCoroutines[hCoroutine].m_pStackLow = NULL;
m_ListCoroutines[hCoroutine].m_pchName = "(no name set)";
#ifdef COROUTINE_TRACE
m_ListCoroutines[hCoroutine].m_hCoroutine = hCoroutine;
#endif
return hCoroutine;
}
HCoroutine GetActiveCoroutineHandle()
{
// look up the coroutine of the last item on the stack
return m_VecCoroutineStack[m_VecCoroutineStack.Count() - 1];
}
CCoroutine &GetActiveCoroutine()
{
// look up the coroutine of the last item on the stack
return m_ListCoroutines[GetActiveCoroutineHandle()];
}
CCoroutine &GetPreviouslyActiveCoroutine()
{
// look up the coroutine that ran the current coroutine
return m_ListCoroutines[m_VecCoroutineStack[m_VecCoroutineStack.Count() - 2]];
}
bool IsValidCoroutine( HCoroutine hCoroutine )
{
return m_ListCoroutines.IsValidIndex( hCoroutine ) && hCoroutine > 0;
}
void SetActiveCoroutine( HCoroutine hCoroutine )
{
m_VecCoroutineStack.AddToTail( hCoroutine );
}
void PopCoroutineStack()
{
Assert( m_VecCoroutineStack.Count() > 1 );
m_VecCoroutineStack.Remove( m_VecCoroutineStack.Count() - 1 );
}
bool IsAnyCoroutineActive()
{
return m_VecCoroutineStack.Count() > 1;
}
void DeleteCoroutine( HCoroutine hCoroutine )
{
m_ListCoroutines.Remove( hCoroutine );
}
#ifdef DBGFLAG_VALIDATE
void Validate( CValidator &validator, const char *pchName )
{
validator.Push( "CCoroutineMgr", this, pchName );
ValidateObj( m_ListCoroutines );
FOR_EACH_LL( m_ListCoroutines, iRoutine )
{
ValidateObj( m_ListCoroutines[iRoutine] );
}
ValidateObj( m_VecCoroutineStack );
validator.Pop();
}
#endif // DBGFLAG_VALIDATE
uint32 m_topofexceptionchain;
private:
CUtlLinkedList<CCoroutine, HCoroutine> m_ListCoroutines;
CUtlVector<HCoroutine> m_VecCoroutineStack;
};
CThreadLocalPtr< CCoroutineMgr > g_ThreadLocalCoroutineMgr;
CUtlVector< CCoroutineMgr * > g_VecPCoroutineMgr;
CThreadMutex g_ThreadMutexCoroutineMgr;
CCoroutineMgr &GCoroutineMgr()
{
if ( !g_ThreadLocalCoroutineMgr )
{
AUTO_LOCK( g_ThreadMutexCoroutineMgr );
g_ThreadLocalCoroutineMgr = new CCoroutineMgr();
g_VecPCoroutineMgr.AddToTail( g_ThreadLocalCoroutineMgr );
}
return *g_ThreadLocalCoroutineMgr;
}
//-----------------------------------------------------------------------------
// Purpose: call when a thread is quiting to release any per-thread memory
//-----------------------------------------------------------------------------
void Coroutine_ReleaseThreadMemory()
{
AUTO_LOCK( g_ThreadMutexCoroutineMgr );
if ( g_ThreadLocalCoroutineMgr != NULL )
{
int iCoroutineMgr = g_VecPCoroutineMgr.Find( g_ThreadLocalCoroutineMgr );
delete g_VecPCoroutineMgr[iCoroutineMgr];
g_VecPCoroutineMgr.Remove( iCoroutineMgr );
}
}
// predecs
void Coroutine_Launch( CCoroutine &coroutine );
void Coroutine_Finish();
//-----------------------------------------------------------------------------
// Purpose: Creates a soroutine, specified by the function, returns a handle
//-----------------------------------------------------------------------------
HCoroutine Coroutine_Create( CoroutineFunc_t pFunc, void *pvParam )
{
return GCoroutineMgr().CreateCoroutine( pFunc, pvParam );
}
//-----------------------------------------------------------------------------
// Purpose: Continues a current coroutine
// input: hCoroutine - the coroutine to continue
// pchDebugMsg - if non-NULL, it will generate an assertion in
// that coroutine, then that coroutine will
// immediately yield back to this thread
//-----------------------------------------------------------------------------
static const char *k_pchDebugMsg_GenericBreak = (const char *)1;
bool Internal_Coroutine_Continue( HCoroutine hCoroutine, const char *pchDebugMsg, const char *pchName )
{
Assert( GCoroutineMgr().IsValidCoroutine(hCoroutine) );
bool bInCoroutineAlready = GCoroutineMgr().IsAnyCoroutineActive();
#ifdef _WIN32
#ifndef _WIN64
// make sure nobody has a try/catch block and then yielded
// because we hate that and we will crash
uint32 topofexceptionchain;
__asm mov eax, dword ptr fs:[0]
__asm mov topofexceptionchain, eax
if ( GCoroutineMgr().m_topofexceptionchain == 0 )
GCoroutineMgr().m_topofexceptionchain = topofexceptionchain;
else
{
Assert( topofexceptionchain == GCoroutineMgr().m_topofexceptionchain );
}
#endif
#endif
// start the new coroutine
GCoroutineMgr().SetActiveCoroutine( hCoroutine );
CCoroutine &coroutinePrev = GCoroutineMgr().GetPreviouslyActiveCoroutine();
CCoroutine &coroutine = GCoroutineMgr().GetActiveCoroutine();
if ( pchName )
coroutine.m_pchName = pchName;
CoroutineDbgMsg( g_fmtstr.sprintf( "Coroutine_Continue() %s#%x -> %s#%x\n", coroutinePrev.m_pchName, coroutinePrev.m_hCoroutine, coroutine.m_pchName, coroutine.m_hCoroutine ) );
bool bStillRunning = true;
// set the point for the coroutine to jump back to
RW_MEMORY_BARRIER;
int iResult = setjmp( coroutinePrev.GetRegisters() );
if ( iResult == k_iSetJmpStateSaved )
{
// copy the new stack in place
if ( coroutine.m_pSavedStack )
{
// save any of the main stack that overlaps where the coroutine stack is going to go
GetStackPtr( pStackSavePoint );
if ( pStackSavePoint <= coroutine.m_pStackHigh )
{
// save the main stack from where the coroutine stack wishes to start
// if the previous coroutine already had a stack save point, just save
// the whole thing.
if ( NULL == coroutinePrev.m_pStackHigh )
{
coroutinePrev.m_pStackHigh = coroutine.m_pStackHigh;
}
else
{
Assert( coroutine.m_pStackHigh <= coroutinePrev.m_pStackHigh );
}
coroutinePrev.SaveStack();
CoroutineDbgMsg( g_fmtstr.sprintf( "SaveStack() %s#%x [%x - %x]\n", coroutinePrev.m_pchName, coroutinePrev.m_hCoroutine, coroutinePrev.m_pStackLow, coroutinePrev.m_pStackHigh ) );
}
// If the coroutine's stack is close enough to where we are on the stack, we need to push ourselves
// down past it, so that the memcpy() doesn't screw up the RestoreStack->memcpy call chain.
if ( coroutine.m_pStackHigh > ( pStackSavePoint - 2048 ) )
{
// If the entire CR stack is above us, we don't need to pad ourselves.
if ( coroutine.m_pStackLow < pStackSavePoint )
{
// push ourselves down
int cubPush = pStackSavePoint - coroutine.m_pStackLow + 512;
volatile byte *pvStackGap = (byte*)stackalloc( cubPush );
pvStackGap[ cubPush-1 ] = 0xF;
CoroutineDbgMsg( g_fmtstr.sprintf( "Adjusting stack point by %d (%x <- %x)\n", cubPush, pvStackGap, &pvStackGap[cubPush] ) );
}
}
// This needs to go right here - after we've maybe padded the stack (so that iJumpCode does not
// get stepped on) and before the RestoreStack() call (because that might step on pchDebugMsg!).
if ( pchDebugMsg == NULL )
{
coroutine.m_iJumpCode = k_iSetJmpContinue;
coroutine.m_pchDebugMsg = NULL;
}
else if ( pchDebugMsg == k_pchDebugMsg_GenericBreak )
{
coroutine.m_iJumpCode = k_iSetJmpDbgBreak;
coroutine.m_pchDebugMsg = NULL;
}
else
{
coroutine.m_iJumpCode = k_iSetJmpDbgBreak;
coroutine.m_pchDebugMsg = pchDebugMsg;
}
// restore the coroutine stack
CoroutineDbgMsg( g_fmtstr.sprintf( "RestoreStack() %s#%x [%x - %x] (current %x)\n", coroutine.m_pchName, coroutine.m_hCoroutine, coroutine.m_pStackLow, coroutine.m_pStackHigh, pStackSavePoint ) );
coroutine.RestoreStack();
// the new stack is in place, so no code here can reference local stack vars
// move the program counter
RW_MEMORY_BARRIER;
Coroutine_longjmp( GCoroutineMgr().GetActiveCoroutine().GetRegisters(), GCoroutineMgr().GetActiveCoroutine().m_iJumpCode );
}
else
{
// set the stack pos for the new coroutine
// jump a long way forward on the stack
// this needs to be a stackalloc() instead of a static buffer, so it won't get optimized out in release build
int cubGap = bInCoroutineAlready ? k_cubCoroutineStackGapSmall : k_cubCoroutineStackGap;
volatile byte *pvStackGap = (byte*)stackalloc( cubGap );
pvStackGap[ cubGap-1 ] = 0xF;
// hasn't started yet, so launch
Coroutine_Launch( coroutine );
}
// when the job yields, the above setjmp() will be called again with non-zero value
// code here will never run
}
else if ( iResult == k_iSetJmpContinue )
{
// just pass through
}
else if ( iResult == k_iSetJmpDone )
{
// we're done, remove the coroutine
GCoroutineMgr().DeleteCoroutine( Coroutine_GetCurrentlyActive() );
bStillRunning = false;
}
// job has suspended itself, we'll get back to it later
GCoroutineMgr().PopCoroutineStack();
return bStillRunning;
}
//-----------------------------------------------------------------------------
// Purpose: Continues a current coroutine
//-----------------------------------------------------------------------------
bool Coroutine_Continue( HCoroutine hCoroutine, const char *pchName )
{
return Internal_Coroutine_Continue( hCoroutine, NULL, pchName );
}
//-----------------------------------------------------------------------------
// Purpose: launches a coroutine way ahead on the stack
//-----------------------------------------------------------------------------
void NOINLINE Coroutine_Launch( CCoroutine &coroutine )
{
#if defined( VPROF_ENABLED )
coroutine.m_pVProfNodeScope = g_VProfCurrentProfile.GetCurrentNode();
#endif
// set our marker
#ifndef _PS3
GetStackPtr( pEsp );
#else
// The stack pointer for the current stack frame points to the top of the stack which already includes space for the
// ABI linkage area. We need to include this area as part of our coroutine stack, as the calling function will copy
// the link register (return address to this function) into this area after calling m_pFunc below. Failing to do so
// could result in the coroutine to return to garbage when complete
uint64 *pStackFrameTwoUp = (uint64*)__builtin_frame_address(2);
// Need to terminate the stack frame sequence so if someone tries to walk the stack in a co-routine they don't go forever.
*pStackFrameTwoUp = 0;
// Need to track where we we save up to on yield, add a few bytes so we save just the beginning linkage area of the stack frame
// we added the null termination to.
byte * pEsp = ((byte*)pStackFrameTwoUp)+32;
#endif
#ifdef _WIN64
// Add a little extra padding, to capture the spill space for the registers
// that is required for us to reserve ABOVE the return address), and also
// align the stack
coroutine.m_pStackHigh = (byte *)( ((uintptr_t)pEsp + 32 + 15) & ~(uintptr_t)15 );
// On Win64, we need to be able to find an exception handler
// if we walk the stack to this point. Currently,
// this is as close to the root as we can go. If we
// try to go higher, we wil fail. That's actually
// OK at run time, because Coroutine_Finish doesn't
// return!
CatchAndWriteMiniDumpForVoidPtrFn( coroutine.m_pFunc, coroutine.m_pvParam, /*bExitQuietly*/ true );
#else
coroutine.m_pStackHigh = (byte *)pEsp;
// run the function directly
coroutine.m_pFunc( coroutine.m_pvParam );
#endif
// longjmp back to the main 'thread'
Coroutine_Finish();
}
//-----------------------------------------------------------------------------
// Purpose: cancels a currently running coroutine
//-----------------------------------------------------------------------------
void Coroutine_Cancel( HCoroutine hCoroutine )
{
GCoroutineMgr().DeleteCoroutine( hCoroutine );
}
//-----------------------------------------------------------------------------
// Purpose: cause a debug break in the specified coroutine
//-----------------------------------------------------------------------------
void Coroutine_DebugBreak( HCoroutine hCoroutine )
{
Internal_Coroutine_Continue( hCoroutine, k_pchDebugMsg_GenericBreak, NULL );
}
//-----------------------------------------------------------------------------
// Purpose: generate an assert (perhaps generating a minidump), with the
// specified failure message, in the specified coroutine
//-----------------------------------------------------------------------------
void Coroutine_DebugAssert( HCoroutine hCoroutine, const char *pchMsg )
{
Assert( pchMsg );
Internal_Coroutine_Continue( hCoroutine, pchMsg, NULL );
}
//-----------------------------------------------------------------------------
// Purpose: returns true if the code is currently running inside of a coroutine
//-----------------------------------------------------------------------------
bool Coroutine_IsActive()
{
return GCoroutineMgr().IsAnyCoroutineActive();
}
//-----------------------------------------------------------------------------
// Purpose: returns a handle the currently active coroutine
//-----------------------------------------------------------------------------
HCoroutine Coroutine_GetCurrentlyActive()
{
Assert( Coroutine_IsActive() );
return GCoroutineMgr().GetActiveCoroutineHandle();
}
//-----------------------------------------------------------------------------
// Purpose: lets the main thread continue
//-----------------------------------------------------------------------------
void Coroutine_YieldToMain()
{
// if you've hit this assert, it's because you're calling yield when not in a coroutine
Assert( Coroutine_IsActive() );
CCoroutine &coroutinePrev = GCoroutineMgr().GetPreviouslyActiveCoroutine();
CCoroutine &coroutine = GCoroutineMgr().GetActiveCoroutine();
CoroutineDbgMsg( g_fmtstr.sprintf( "Coroutine_YieldToMain() %s#%x -> %s#%x\n", coroutine.m_pchName, coroutine.m_hCoroutine, coroutinePrev.m_pchName, coroutinePrev.m_hCoroutine ) );
#ifdef _WIN32
#ifndef _WIN64
// make sure nobody has a try/catch block and then yielded
// because we hate that and we will crash
uint32 topofexceptionchain;
__asm mov eax, dword ptr fs:[0]
__asm mov topofexceptionchain, eax
if ( GCoroutineMgr().m_topofexceptionchain == 0 )
GCoroutineMgr().m_topofexceptionchain = topofexceptionchain;
else
{
Assert( topofexceptionchain == GCoroutineMgr().m_topofexceptionchain );
}
#endif
#endif
RW_MEMORY_BARRIER;
int iResult = setjmp( coroutine.GetRegisters() );
if ( ( iResult == k_iSetJmpStateSaved ) || ( iResult == k_iSetJmpDbgBreak ) )
{
// break / assert requested?
if ( iResult == k_iSetJmpDbgBreak )
{
// Assert (minidump) requested?
if ( coroutine.m_pchDebugMsg )
{
// Generate a failed assertion
AssertMsg1( !"Coroutine assert requested", "%s", coroutine.m_pchDebugMsg );
}
else
{
// If we were loaded only to debug, call a break
DebuggerBreakIfDebugging();
}
// Now IMMEDIATELY yield back to the main thread
}
// Clear message, regardless
coroutine.m_pchDebugMsg = NULL;
// save our stack - all the way to the top, err bottom err, the end of it ( where esp is )
coroutine.SaveStack();
CoroutineDbgMsg( g_fmtstr.sprintf( "SaveStack() %s#%x [%x - %x]\n", coroutine.m_pchName, coroutine.m_hCoroutine, coroutine.m_pStackLow, coroutine.m_pStackHigh ) );
// restore the main thread stack
// allocate a bunch of stack padding so we don't kill ourselves while in stack restoration
// If the coroutine's stack is close enough to where we are on the stack, we need to push ourselves
// down past it, so that the memcpy() doesn't screw up the RestoreStack->memcpy call chain.
GetStackPtr( pStackPtr );
if ( pStackPtr >= (coroutinePrev.m_pStackHigh - coroutinePrev.m_cubSavedStack) && ( pStackPtr - 2048 ) <= coroutinePrev.m_pStackHigh )
{
int cubPush = coroutinePrev.m_cubSavedStack + 512;
volatile byte *pvStackGap = (byte*)stackalloc( cubPush );
pvStackGap[ cubPush - 1 ] = 0xF;
CoroutineDbgMsg( g_fmtstr.sprintf( "Adjusting stack point by %d (%x <- %x)\n", cubPush, pvStackGap, &pvStackGap[cubPush] ) );
}
CoroutineDbgMsg( g_fmtstr.sprintf( "RestoreStack() %s#%x [%x - %x]\n", coroutinePrev.m_pchName, coroutinePrev.m_hCoroutine, coroutinePrev.m_pStackLow, coroutinePrev.m_pStackHigh ) );
coroutinePrev.RestoreStack();
// jump back to the main thread
// Our stack may have been mucked with, can't use local vars anymore!
RW_MEMORY_BARRIER;
Coroutine_longjmp( GCoroutineMgr().GetPreviouslyActiveCoroutine().GetRegisters(), k_iSetJmpContinue );
UNREACHABLE();
}
else
{
// we've been restored, now continue on our merry way
}
}
//-----------------------------------------------------------------------------
// Purpose: done with the Coroutine, terminate safely
//-----------------------------------------------------------------------------
void Coroutine_Finish()
{
Assert( Coroutine_IsActive() );
CoroutineDbgMsg( g_fmtstr.sprintf( "Coroutine_Finish() %s#%x -> %s#%x\n", GCoroutineMgr().GetActiveCoroutine().m_pchName, GCoroutineMgr().GetActiveCoroutineHandle(), GCoroutineMgr().GetPreviouslyActiveCoroutine().m_pchName, &GCoroutineMgr().GetPreviouslyActiveCoroutine() ) );
// allocate a bunch of stack padding so we don't kill ourselves while in stack restoration
volatile byte *pvStackGap = (byte*)stackalloc( GCoroutineMgr().GetPreviouslyActiveCoroutine().m_cubSavedStack + 512 );
pvStackGap[ GCoroutineMgr().GetPreviouslyActiveCoroutine().m_cubSavedStack + 511 ] = 0xf;
GCoroutineMgr().GetPreviouslyActiveCoroutine().RestoreStack();
RW_MEMORY_BARRIER;
// go back to the main thread, signaling that we're done
Coroutine_longjmp( GCoroutineMgr().GetPreviouslyActiveCoroutine().GetRegisters(), k_iSetJmpDone );
UNREACHABLE();
}
//-----------------------------------------------------------------------------
// Purpose: Coroutine that spawns another coroutine
//-----------------------------------------------------------------------------
void CoroutineTestFunc( void *pvRelaunch )
{
static const char *g_pchTestString = "test string";
char rgchT[256];
Q_strncpy( rgchT, g_pchTestString, sizeof(rgchT) );
// yield
Coroutine_YieldToMain();
// ensure the string is still valid
DbgVerifyNot( Q_strcmp( rgchT, g_pchTestString ) );
if ( !pvRelaunch )
{
// test launching coroutines inside of coroutines
HCoroutine hCoroutine = Coroutine_Create( &CoroutineTestFunc, (void *)(size_t)0xFFFFFFFF );
// first pass the coroutines should all still be running
DbgVerify( Coroutine_Continue( hCoroutine, NULL ) );
// second pass the coroutines should all be finished
DbgVerifyNot( Coroutine_Continue( hCoroutine, NULL ) );
}
}
// test that just spins a few times
void CoroutineTestL2( void * )
{
// spin a few times
for ( int i = 0; i < 5; i++ )
{
Coroutine_YieldToMain();
}
}
// level 1 of a test
void CoroutineTestL1( void *pvecCoroutineL2 )
{
CUtlVector<HCoroutine> &vecCoroutineL2 = *(CUtlVector<HCoroutine> *)pvecCoroutineL2;
int i = 20;
// launch a set of coroutines
for ( i = 0; i < 20; i++ )
{
HCoroutine hCoroutine = Coroutine_Create( &CoroutineTestL2, NULL );
vecCoroutineL2.AddToTail( hCoroutine );
Coroutine_Continue( hCoroutine, NULL );
// now yield back to main occasionally
if ( i % 2 == 1 )
Coroutine_YieldToMain();
}
Assert( i == 20 );
}
//-----------------------------------------------------------------------------
// Purpose: runs a self-test of the coroutine system
// it's working if it doesn't crash
//-----------------------------------------------------------------------------
bool Coroutine_Test()
{
// basic calling of a coroutine
HCoroutine hCoroutine = Coroutine_Create( &CoroutineTestFunc, NULL );
Coroutine_Continue( hCoroutine, NULL );
Coroutine_Continue( hCoroutine, NULL );
// now test
CUtlVector<HCoroutine> vecCoroutineL2;
hCoroutine = Coroutine_Create( &CoroutineTestL1, &vecCoroutineL2 );
Coroutine_Continue( hCoroutine, NULL );
// run the sub-coroutines until they're all done
while ( vecCoroutineL2.Count() )
{
if ( hCoroutine && !Coroutine_Continue( hCoroutine, NULL ) )
hCoroutine = NULL;
FOR_EACH_VEC_BACK( vecCoroutineL2, i )
{
if ( !Coroutine_Continue( vecCoroutineL2[i], NULL ) )
vecCoroutineL2.Remove( i );
}
}
// new one
hCoroutine = Coroutine_Create( &CoroutineTestFunc, NULL );
// it has yielded, now continue it's call
{
// pop our stack up so it collides with the coroutine stack position
Coroutine_Continue( hCoroutine, NULL );
volatile byte *pvAlloca = (byte*)stackalloc( k_cubCoroutineStackGapSmall );
pvAlloca[ k_cubCoroutineStackGapSmall-1 ] = 0xF;
Coroutine_Continue( hCoroutine, NULL );
}
// now do a whole bunch of them
static const int k_nSimultaneousCoroutines = 10 * 1000;
CUtlVector<HCoroutine> coroutines;
Assert( coroutines.Base() == NULL );
for (int i = 0; i < k_nSimultaneousCoroutines; i++)
{
coroutines.AddToTail( Coroutine_Create( &CoroutineTestFunc, NULL ) );
}
for (int i = 0; i < coroutines.Count(); i++)
{
// first pass the coroutines should all still be running
DbgVerify( Coroutine_Continue( coroutines[i], NULL ) );
}
for (int i = 0; i < coroutines.Count(); i++)
{
// second pass the coroutines should all be finished
DbgVerifyNot( Coroutine_Continue( coroutines[i], NULL ) );
}
return true;
}
//-----------------------------------------------------------------------------
// Purpose: returns approximate stack depth of current coroutine.
//-----------------------------------------------------------------------------
size_t Coroutine_GetStackDepth()
{
// should only get called from a coroutine
Assert( GCoroutineMgr().IsAnyCoroutineActive() );
if ( !GCoroutineMgr().IsAnyCoroutineActive() )
return 0;
GetStackPtr( pLocal );
CCoroutine &coroutine = GCoroutineMgr().GetActiveCoroutine();
return ( coroutine.m_pStackHigh - pLocal );
}
//-----------------------------------------------------------------------------
// Purpose: validates memory
//-----------------------------------------------------------------------------
void Coroutine_ValidateGlobals( class CValidator &validator )
{
#ifdef DBGFLAG_VALIDATE
AUTO_LOCK( g_ThreadMutexCoroutineMgr );
for ( int i = 0; i < g_VecPCoroutineMgr.Count(); i++ )
{
ValidatePtr( g_VecPCoroutineMgr[i] );
}
ValidateObj( g_VecPCoroutineMgr );
#endif
}