Initial import.

1 files changed, 917 insertions, 0 deletions

diff --git a/src/qcommon/vm.c b/src/qcommon/vm.c
new file mode 100644
index 0000000..225119f
--- /dev/null
+++ b/src/qcommon/vm.c
@@ -0,0 +1,917 @@
+/*
+===========================================================================
+Copyright (C) 1999-2005 Id Software, Inc.
+Copyright (C) 2000-2009 Darklegion Development
+
+This file is part of Tremulous.
+
+Tremulous is free software; you can redistribute it
+and/or modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation; either version 2 of the License,
+or (at your option) any later version.
+
+Tremulous is distributed in the hope that it will be
+useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Tremulous; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+===========================================================================
+*/
+// vm.c -- virtual machine
+
+/*
+
+
+intermix code and data
+symbol table
+
+a dll has one imported function: VM_SystemCall
+and one exported function: Perform
+
+
+*/
+
+#include "vm_local.h"
+
+
+vm_t	*currentVM = NULL;
+vm_t	*lastVM    = NULL;
+int		vm_debugLevel;
+
+// used by Com_Error to get rid of running vm's before longjmp
+static int forced_unload;
+
+#define	MAX_VM		3
+vm_t	vmTable[MAX_VM];
+
+
+void VM_VmInfo_f( void );
+void VM_VmProfile_f( void );
+
+
+
+#if 0 // 64bit!
+// converts a VM pointer to a C pointer and
+// checks to make sure that the range is acceptable
+void	*VM_VM2C( vmptr_t p, int length ) {
+	return (void *)p;
+}
+#endif
+
+void VM_Debug( int level ) {
+	vm_debugLevel = level;
+}
+
+/*
+==============
+VM_Init
+==============
+*/
+void VM_Init( void ) {
+	Cvar_Get( "vm_cgame", "2", CVAR_ARCHIVE );	// !@# SHIP WITH SET TO 2
+	Cvar_Get( "vm_game", "2", CVAR_ARCHIVE );	// !@# SHIP WITH SET TO 2
+	Cvar_Get( "vm_ui", "2", CVAR_ARCHIVE );		// !@# SHIP WITH SET TO 2
+
+	Cmd_AddCommand ("vmprofile", VM_VmProfile_f );
+	Cmd_AddCommand ("vminfo", VM_VmInfo_f );
+
+	Com_Memset( vmTable, 0, sizeof( vmTable ) );
+}
+
+
+/*
+===============
+VM_ValueToSymbol
+
+Assumes a program counter value
+===============
+*/
+const char *VM_ValueToSymbol( vm_t *vm, int value ) {
+	vmSymbol_t	*sym;
+	static char		text[MAX_TOKEN_CHARS];
+
+	sym = vm->symbols;
+	if ( !sym ) {
+		return "NO SYMBOLS";
+	}
+
+	// find the symbol
+	while ( sym->next && sym->next->symValue <= value ) {
+		sym = sym->next;
+	}
+
+	if ( value == sym->symValue ) {
+		return sym->symName;
+	}
+
+	Com_sprintf( text, sizeof( text ), "%s+%i", sym->symName, value - sym->symValue );
+
+	return text;
+}
+
+/*
+===============
+VM_ValueToFunctionSymbol
+
+For profiling, find the symbol behind this value
+===============
+*/
+vmSymbol_t *VM_ValueToFunctionSymbol( vm_t *vm, int value ) {
+	vmSymbol_t	*sym;
+	static vmSymbol_t	nullSym;
+
+	sym = vm->symbols;
+	if ( !sym ) {
+		return &nullSym;
+	}
+
+	while ( sym->next && sym->next->symValue <= value ) {
+		sym = sym->next;
+	}
+
+	return sym;
+}
+
+
+/*
+===============
+VM_SymbolToValue
+===============
+*/
+int VM_SymbolToValue( vm_t *vm, const char *symbol ) {
+	vmSymbol_t	*sym;
+
+	for ( sym = vm->symbols ; sym ; sym = sym->next ) {
+		if ( !strcmp( symbol, sym->symName ) ) {
+			return sym->symValue;
+		}
+	}
+	return 0;
+}
+
+
+/*
+=====================
+VM_SymbolForCompiledPointer
+=====================
+*/
+#if 0 // 64bit!
+const char *VM_SymbolForCompiledPointer( vm_t *vm, void *code ) {
+	int			i;
+
+	if ( code < (void *)vm->codeBase ) {
+		return "Before code block";
+	}
+	if ( code >= (void *)(vm->codeBase + vm->codeLength) ) {
+		return "After code block";
+	}
+
+	// find which original instruction it is after
+	for ( i = 0 ; i < vm->codeLength ; i++ ) {
+		if ( (void *)vm->instructionPointers[i] > code ) {
+			break;
+		}
+	}
+	i--;
+
+	// now look up the bytecode instruction pointer
+	return VM_ValueToSymbol( vm, i );
+}
+#endif
+
+
+
+/*
+===============
+ParseHex
+===============
+*/
+int	ParseHex( const char *text ) {
+	int		value;
+	int		c;
+
+	value = 0;
+	while ( ( c = *text++ ) != 0 ) {
+		if ( c >= '0' && c <= '9' ) {
+			value = value * 16 + c - '0';
+			continue;
+		}
+		if ( c >= 'a' && c <= 'f' ) {
+			value = value * 16 + 10 + c - 'a';
+			continue;
+		}
+		if ( c >= 'A' && c <= 'F' ) {
+			value = value * 16 + 10 + c - 'A';
+			continue;
+		}
+	}
+
+	return value;
+}
+
+/*
+===============
+VM_LoadSymbols
+===============
+*/
+void VM_LoadSymbols( vm_t *vm ) {
+	int		len;
+	union {
+		char	*c;
+		void	*v;
+	} mapfile;
+	char *text_p, *token;
+	char	name[MAX_QPATH];
+	char	symbols[MAX_QPATH];
+	vmSymbol_t	**prev, *sym;
+	int		count;
+	int		value;
+	int		chars;
+	int		segment;
+	int		numInstructions;
+
+	// don't load symbols if not developer
+	if ( !com_developer->integer ) {
+		return;
+	}
+
+	COM_StripExtension(vm->name, name, sizeof(name));
+	Com_sprintf( symbols, sizeof( symbols ), "vm/%s.map", name );
+	len = FS_ReadFile( symbols, &mapfile.v );
+	if ( !mapfile.c ) {
+		Com_Printf( "Couldn't load symbol file: %s\n", symbols );
+		return;
+	}
+
+	numInstructions = vm->instructionCount;
+
+	// parse the symbols
+	text_p = mapfile.c;
+	prev = &vm->symbols;
+	count = 0;
+
+	while ( 1 ) {
+		token = COM_Parse( &text_p );
+		if ( !token[0] ) {
+			break;
+		}
+		segment = ParseHex( token );
+		if ( segment ) {
+			COM_Parse( &text_p );
+			COM_Parse( &text_p );
+			continue;		// only load code segment values
+		}
+
+		token = COM_Parse( &text_p );
+		if ( !token[0] ) {
+			Com_Printf( "WARNING: incomplete line at end of file\n" );
+			break;
+		}
+		value = ParseHex( token );
+
+		token = COM_Parse( &text_p );
+		if ( !token[0] ) {
+			Com_Printf( "WARNING: incomplete line at end of file\n" );
+			break;
+		}
+		chars = strlen( token );
+		sym = Hunk_Alloc( sizeof( *sym ) + chars, h_high );
+		*prev = sym;
+		prev = &sym->next;
+		sym->next = NULL;
+
+		// convert value from an instruction number to a code offset
+		if ( value >= 0 && value < numInstructions ) {
+			value = vm->instructionPointers[value];
+		}
+
+		sym->symValue = value;
+		Q_strncpyz( sym->symName, token, chars + 1 );
+
+		count++;
+	}
+
+	vm->numSymbols = count;
+	Com_Printf( "%i symbols parsed from %s\n", count, symbols );
+	FS_FreeFile( mapfile.v );
+}
+
+/*
+============
+VM_DllSyscall
+
+Dlls will call this directly
+
+ rcg010206 The horror; the horror.
+
+  The syscall mechanism relies on stack manipulation to get its args.
+   This is likely due to C's inability to pass "..." parameters to
+   a function in one clean chunk. On PowerPC Linux, these parameters
+   are not necessarily passed on the stack, so while (&arg[0] == arg)
+   is true, (&arg[1] == 2nd function parameter) is not necessarily
+   accurate, as arg's value might have been stored to the stack or
+   other piece of scratch memory to give it a valid address, but the
+   next parameter might still be sitting in a register.
+
+  Quake's syscall system also assumes that the stack grows downward,
+   and that any needed types can be squeezed, safely, into a signed int.
+
+  This hack below copies all needed values for an argument to a
+   array in memory, so that Quake can get the correct values. This can
+   also be used on systems where the stack grows upwards, as the
+   presumably standard and safe stdargs.h macros are used.
+
+  As for having enough space in a signed int for your datatypes, well,
+   it might be better to wait for DOOM 3 before you start porting.  :)
+
+  The original code, while probably still inherently dangerous, seems
+   to work well enough for the platforms it already works on. Rather
+   than add the performance hit for those platforms, the original code
+   is still in use there.
+
+  For speed, we just grab 15 arguments, and don't worry about exactly
+   how many the syscall actually needs; the extra is thrown away.
+ 
+============
+*/
+intptr_t QDECL VM_DllSyscall( intptr_t arg, ... ) {
+#if !id386
+  // rcg010206 - see commentary above
+  intptr_t args[16];
+  int i;
+  va_list ap;
+  
+  args[0] = arg;
+  
+  va_start(ap, arg);
+  for (i = 1; i < ARRAY_LEN (args); i++)
+    args[i] = va_arg(ap, intptr_t);
+  va_end(ap);
+  
+  return currentVM->systemCall( args );
+#else // original id code
+	return currentVM->systemCall( &arg );
+#endif
+}
+
+
+/*
+=================
+VM_LoadQVM
+
+Load a .qvm file
+=================
+*/
+vmHeader_t *VM_LoadQVM( vm_t *vm, qboolean alloc ) {
+	int					length;
+	int					dataLength;
+	int					i;
+	char				filename[MAX_QPATH];
+	union {
+		vmHeader_t	*h;
+		void				*v;
+	} header;
+
+	// load the image
+	Com_sprintf( filename, sizeof(filename), "vm/%s.qvm", vm->name );
+	Com_Printf( "Loading vm file %s...\n", filename );
+	length = FS_ReadFile( filename, &header.v );
+	if ( !header.h ) {
+		Com_Printf( "Failed.\n" );
+		VM_Free( vm );
+		return NULL;
+	}
+
+	// show where the qvm was loaded from
+	Cmd_ExecuteString( va( "which %s\n", filename ) );
+
+	if( LittleLong( header.h->vmMagic ) == VM_MAGIC_VER2 ) {
+		Com_Printf( "...which has vmMagic VM_MAGIC_VER2\n" );
+
+		// byte swap the header
+		for ( i = 0 ; i < sizeof( vmHeader_t ) / 4 ; i++ ) {
+			((int *)header.h)[i] = LittleLong( ((int *)header.h)[i] );
+		}
+
+		// validate
+		if ( header.h->jtrgLength < 0
+			|| header.h->bssLength < 0
+			|| header.h->dataLength < 0
+			|| header.h->litLength < 0
+			|| header.h->codeLength <= 0 ) {
+			VM_Free( vm );
+			Com_Error( ERR_FATAL, "%s has bad header", filename );
+		}
+	} else if( LittleLong( header.h->vmMagic ) == VM_MAGIC ) {
+		// byte swap the header
+		// sizeof( vmHeader_t ) - sizeof( int ) is the 1.32b vm header size
+		for ( i = 0 ; i < ( sizeof( vmHeader_t ) - sizeof( int ) ) / 4 ; i++ ) {
+			((int *)header.h)[i] = LittleLong( ((int *)header.h)[i] );
+		}
+
+		// validate
+		if ( header.h->bssLength < 0
+			|| header.h->dataLength < 0
+			|| header.h->litLength < 0
+			|| header.h->codeLength <= 0 ) {
+			VM_Free( vm );
+			Com_Error( ERR_FATAL, "%s has bad header", filename );
+		}
+	} else {
+		VM_Free( vm );
+		Com_Error( ERR_FATAL, "%s does not have a recognisable "
+				"magic number in its header", filename );
+	}
+
+	// round up to next power of 2 so all data operations can
+	// be mask protected
+	dataLength = header.h->dataLength + header.h->litLength +
+		header.h->bssLength;
+	for ( i = 0 ; dataLength > ( 1 << i ) ; i++ ) {
+	}
+	dataLength = 1 << i;
+
+	if( alloc ) {
+		// allocate zero filled space for initialized and uninitialized data
+		vm->dataBase = Hunk_Alloc( dataLength, h_high );
+		vm->dataMask = dataLength - 1;
+	} else {
+		// clear the data
+		Com_Memset( vm->dataBase, 0, dataLength );
+	}
+
+	// copy the intialized data
+	Com_Memcpy( vm->dataBase, (byte *)header.h + header.h->dataOffset,
+		header.h->dataLength + header.h->litLength );
+
+	// byte swap the longs
+	for ( i = 0 ; i < header.h->dataLength ; i += 4 ) {
+		*(int *)(vm->dataBase + i) = LittleLong( *(int *)(vm->dataBase + i ) );
+	}
+
+	if( header.h->vmMagic == VM_MAGIC_VER2 ) {
+		vm->numJumpTableTargets = header.h->jtrgLength >> 2;
+		Com_Printf( "Loading %d jump table targets\n", vm->numJumpTableTargets );
+
+		if( alloc ) {
+			vm->jumpTableTargets = Hunk_Alloc( header.h->jtrgLength, h_high );
+		} else {
+			Com_Memset( vm->jumpTableTargets, 0, header.h->jtrgLength );
+		}
+
+		Com_Memcpy( vm->jumpTableTargets, (byte *)header.h + header.h->dataOffset +
+				header.h->dataLength + header.h->litLength, header.h->jtrgLength );
+
+		// byte swap the longs
+		for ( i = 0 ; i < header.h->jtrgLength ; i += 4 ) {
+			*(int *)(vm->jumpTableTargets + i) = LittleLong( *(int *)(vm->jumpTableTargets + i ) );
+		}
+	}
+
+	return header.h;
+}
+
+/*
+=================
+VM_Restart
+
+Reload the data, but leave everything else in place
+This allows a server to do a map_restart without changing memory allocation
+=================
+*/
+vm_t *VM_Restart( vm_t *vm ) {
+	vmHeader_t	*header;
+
+	// DLL's can't be restarted in place
+	if ( vm->dllHandle ) {
+		char	name[MAX_QPATH];
+		intptr_t	(*systemCall)( intptr_t *parms );
+		
+		systemCall = vm->systemCall;	
+		Q_strncpyz( name, vm->name, sizeof( name ) );
+
+		VM_Free( vm );
+
+		vm = VM_Create( name, systemCall, VMI_NATIVE );
+		return vm;
+	}
+
+	// load the image
+	Com_Printf( "VM_Restart()\n" );
+
+	if( !( header = VM_LoadQVM( vm, qfalse ) ) ) {
+		Com_Error( ERR_DROP, "VM_Restart failed.\n" );
+		return NULL;
+	}
+
+	// free the original file
+	FS_FreeFile( header );
+
+	return vm;
+}
+
+/*
+================
+VM_Create
+
+If image ends in .qvm it will be interpreted, otherwise
+it will attempt to load as a system dll
+================
+*/
+vm_t *VM_Create( const char *module, intptr_t (*systemCalls)(intptr_t *), 
+				vmInterpret_t interpret ) {
+	vm_t		*vm;
+	vmHeader_t	*header;
+	int			i, remaining;
+
+	if ( !module || !module[0] || !systemCalls ) {
+		Com_Error( ERR_FATAL, "VM_Create: bad parms" );
+	}
+
+	remaining = Hunk_MemoryRemaining();
+
+	// see if we already have the VM
+	for ( i = 0 ; i < MAX_VM ; i++ ) {
+		if (!Q_stricmp(vmTable[i].name, module)) {
+			vm = &vmTable[i];
+			return vm;
+		}
+	}
+
+	// find a free vm
+	for ( i = 0 ; i < MAX_VM ; i++ ) {
+		if ( !vmTable[i].name[0] ) {
+			break;
+		}
+	}
+
+	if ( i == MAX_VM ) {
+		Com_Error( ERR_FATAL, "VM_Create: no free vm_t" );
+	}
+
+	vm = &vmTable[i];
+
+	Q_strncpyz( vm->name, module, sizeof( vm->name ) );
+	vm->systemCall = systemCalls;
+
+	if ( interpret == VMI_NATIVE ) {
+		// try to load as a system dll
+		Com_Printf( "Loading dll file %s.\n", vm->name );
+		vm->dllHandle = Sys_LoadDll( module, &vm->entryPoint, VM_DllSyscall );
+		if ( vm->dllHandle ) {
+			return vm;
+		}
+
+		Com_Printf( "Failed to load dll, looking for qvm.\n" );
+		interpret = VMI_COMPILED;
+	}
+
+	// load the image
+	if( !( header = VM_LoadQVM( vm, qtrue ) ) ) {
+		return NULL;
+	}
+
+	// allocate space for the jump targets, which will be filled in by the compile/prep functions
+	vm->instructionCount = header->instructionCount;
+	vm->instructionPointers = Hunk_Alloc( vm->instructionCount*4, h_high );
+
+	// copy or compile the instructions
+	vm->codeLength = header->codeLength;
+
+	vm->compiled = qfalse;
+
+#ifdef NO_VM_COMPILED
+	if(interpret >= VMI_COMPILED) {
+		Com_Printf("Architecture doesn't have a bytecode compiler, using interpreter\n");
+		interpret = VMI_BYTECODE;
+	}
+#else
+	if ( interpret >= VMI_COMPILED ) {
+		vm->compiled = qtrue;
+		VM_Compile( vm, header );
+	}
+#endif
+	// VM_Compile may have reset vm->compiled if compilation failed
+	if (!vm->compiled)
+	{
+		VM_PrepareInterpreter( vm, header );
+	}
+
+	// free the original file
+	FS_FreeFile( header );
+
+	// load the map file
+	VM_LoadSymbols( vm );
+
+	// the stack is implicitly at the end of the image
+	vm->programStack = vm->dataMask + 1;
+	vm->stackBottom = vm->programStack - PROGRAM_STACK_SIZE;
+
+	Com_Printf("%s loaded in %d bytes on the hunk\n", module, remaining - Hunk_MemoryRemaining());
+
+	return vm;
+}
+
+/*
+==============
+VM_Free
+==============
+*/
+void VM_Free( vm_t *vm ) {
+
+	if(!vm) {
+		return;
+	}
+
+	if(vm->callLevel) {
+		if(!forced_unload) {
+			Com_Error( ERR_FATAL, "VM_Free(%s) on running vm", vm->name );
+			return;
+		} else {
+			Com_Printf( "forcefully unloading %s vm\n", vm->name );
+		}
+	}
+
+	if(vm->destroy)
+		vm->destroy(vm);
+
+	if ( vm->dllHandle ) {
+		Sys_UnloadDll( vm->dllHandle );
+		Com_Memset( vm, 0, sizeof( *vm ) );
+	}
+#if 0	// now automatically freed by hunk
+	if ( vm->codeBase ) {
+		Z_Free( vm->codeBase );
+	}
+	if ( vm->dataBase ) {
+		Z_Free( vm->dataBase );
+	}
+	if ( vm->instructionPointers ) {
+		Z_Free( vm->instructionPointers );
+	}
+#endif
+	Com_Memset( vm, 0, sizeof( *vm ) );
+
+	currentVM = NULL;
+	lastVM = NULL;
+}
+
+void VM_Clear(void) {
+	int i;
+	for (i=0;i<MAX_VM; i++) {
+		VM_Free(&vmTable[i]);
+	}
+}
+
+void VM_Forced_Unload_Start(void) {
+	forced_unload = 1;
+}
+
+void VM_Forced_Unload_Done(void) {
+	forced_unload = 0;
+}
+
+void *VM_ArgPtr( intptr_t intValue ) {
+	if ( !intValue ) {
+		return NULL;
+	}
+	// currentVM is missing on reconnect
+	if ( currentVM==NULL )
+	  return NULL;
+
+	if ( currentVM->entryPoint ) {
+		return (void *)(currentVM->dataBase + intValue);
+	}
+	else {
+		return (void *)(currentVM->dataBase + (intValue & currentVM->dataMask));
+	}
+}
+
+void *VM_ExplicitArgPtr( vm_t *vm, intptr_t intValue ) {
+	if ( !intValue ) {
+		return NULL;
+	}
+
+	// currentVM is missing on reconnect here as well?
+	if ( currentVM==NULL )
+	  return NULL;
+
+	//
+	if ( vm->entryPoint ) {
+		return (void *)(vm->dataBase + intValue);
+	}
+	else {
+		return (void *)(vm->dataBase + (intValue & vm->dataMask));
+	}
+}
+
+
+/*
+==============
+VM_Call
+
+
+Upon a system call, the stack will look like:
+
+sp+32	parm1
+sp+28	parm0
+sp+24	return value
+sp+20	return address
+sp+16	local1
+sp+14	local0
+sp+12	arg1
+sp+8	arg0
+sp+4	return stack
+sp		return address
+
+An interpreted function will immediately execute
+an OP_ENTER instruction, which will subtract space for
+locals from sp
+==============
+*/
+
+intptr_t	QDECL VM_Call( vm_t *vm, int callnum, ... ) {
+	vm_t	*oldVM;
+	intptr_t r;
+	int i;
+
+	if ( !vm ) {
+		Com_Error( ERR_FATAL, "VM_Call with NULL vm" );
+	}
+
+	oldVM = currentVM;
+	currentVM = vm;
+	lastVM = vm;
+
+	if ( vm_debugLevel ) {
+	  Com_Printf( "VM_Call( %d )\n", callnum );
+	}
+
+	++vm->callLevel;
+	// if we have a dll loaded, call it directly
+	if ( vm->entryPoint ) {
+		//rcg010207 -  see dissertation at top of VM_DllSyscall() in this file.
+		int args[10];
+		va_list ap;
+		va_start(ap, callnum);
+		for (i = 0; i < ARRAY_LEN(args); i++) {
+			args[i] = va_arg(ap, int);
+		}
+		va_end(ap);
+
+		r = vm->entryPoint( callnum,  args[0],  args[1],  args[2], args[3],
+                            args[4],  args[5],  args[6], args[7],
+                            args[8],  args[9]);
+	} else {
+#if id386 || idsparc // i386/sparc calling convention doesn't need conversion
+#ifndef NO_VM_COMPILED
+		if ( vm->compiled )
+			r = VM_CallCompiled( vm, (int*)&callnum );
+		else
+#endif
+			r = VM_CallInterpreted( vm, (int*)&callnum );
+#else
+		struct {
+			int callnum;
+			int args[10];
+		} a;
+		va_list ap;
+
+		a.callnum = callnum;
+		va_start(ap, callnum);
+		for (i = 0; i < ARRAY_LEN(a.args); i++) {
+			a.args[i] = va_arg(ap, int);
+		}
+		va_end(ap);
+#ifndef NO_VM_COMPILED
+		if ( vm->compiled )
+			r = VM_CallCompiled( vm, &a.callnum );
+		else
+#endif
+			r = VM_CallInterpreted( vm, &a.callnum );
+#endif
+	}
+	--vm->callLevel;
+
+	if ( oldVM != NULL )
+	  currentVM = oldVM;
+	return r;
+}
+
+//=================================================================
+
+static int QDECL VM_ProfileSort( const void *a, const void *b ) {
+	vmSymbol_t	*sa, *sb;
+
+	sa = *(vmSymbol_t **)a;
+	sb = *(vmSymbol_t **)b;
+
+	if ( sa->profileCount < sb->profileCount ) {
+		return -1;
+	}
+	if ( sa->profileCount > sb->profileCount ) {
+		return 1;
+	}
+	return 0;
+}
+
+/*
+==============
+VM_VmProfile_f
+
+==============
+*/
+void VM_VmProfile_f( void ) {
+	vm_t		*vm;
+	vmSymbol_t	**sorted, *sym;
+	int			i;
+	double		total;
+
+	if ( !lastVM ) {
+		return;
+	}
+
+	vm = lastVM;
+
+	if ( !vm->numSymbols ) {
+		return;
+	}
+
+	sorted = Z_Malloc( vm->numSymbols * sizeof( *sorted ) );
+	sorted[0] = vm->symbols;
+	total = sorted[0]->profileCount;
+	for ( i = 1 ; i < vm->numSymbols ; i++ ) {
+		sorted[i] = sorted[i-1]->next;
+		total += sorted[i]->profileCount;
+	}
+
+	qsort( sorted, vm->numSymbols, sizeof( *sorted ), VM_ProfileSort );
+
+	for ( i = 0 ; i < vm->numSymbols ; i++ ) {
+		int		perc;
+
+		sym = sorted[i];
+
+		perc = 100 * (float) sym->profileCount / total;
+		Com_Printf( "%2i%% %9i %s\n", perc, sym->profileCount, sym->symName );
+		sym->profileCount = 0;
+	}
+
+	Com_Printf("    %9.0f total\n", total );
+
+	Z_Free( sorted );
+}
+
+/*
+==============
+VM_VmInfo_f
+
+==============
+*/
+void VM_VmInfo_f( void ) {
+	vm_t	*vm;
+	int		i;
+
+	Com_Printf( "Registered virtual machines:\n" );
+	for ( i = 0 ; i < MAX_VM ; i++ ) {
+		vm = &vmTable[i];
+		if ( !vm->name[0] ) {
+			break;
+		}
+		Com_Printf( "%s : ", vm->name );
+		if ( vm->dllHandle ) {
+			Com_Printf( "native\n" );
+			continue;
+		}
+		if ( vm->compiled ) {
+			Com_Printf( "compiled on load\n" );
+		} else {
+			Com_Printf( "interpreted\n" );
+		}
+		Com_Printf( "    code length : %7i\n", vm->codeLength );
+		Com_Printf( "    table length: %7i\n", vm->instructionCount*4 );
+		Com_Printf( "    data length : %7i\n", vm->dataMask + 1 );
+	}
+}
+
+/*
+===============
+VM_LogSyscalls
+
+Insert calls to this while debugging the vm compiler
+===============
+*/
+void VM_LogSyscalls( int *args ) {
+	static	int		callnum;
+	static	FILE	*f;
+
+	if ( !f ) {
+		f = fopen("syscalls.log", "w" );
+	}
+	callnum++;
+	fprintf(f, "%i: %p (%i) = %i %i %i %i\n", callnum, (void*)(args - (int *)currentVM->dataBase),
+		args[0], args[1], args[2], args[3], args[4] );
+}