Mercurial > hg > truffle
view src/os_cpu/windows_x86/vm/os_windows_x86.cpp @ 453:c96030fff130
6684579: SoftReference processing can be made more efficient
Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not.
Reviewed-by: jmasa
author | ysr |
---|---|
date | Thu, 20 Nov 2008 16:56:09 -0800 |
parents | 9ee9cf798b59 |
children | d0994e5bebce |
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/* * Copyright 1999-2008 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ // do not include precompiled header file # include "incls/_os_windows_x86.cpp.incl" # include "unwind_windows_x86.hpp" #undef REG_SP #undef REG_FP #undef REG_PC #ifdef AMD64 #define REG_SP Rsp #define REG_FP Rbp #define REG_PC Rip #else #define REG_SP Esp #define REG_FP Ebp #define REG_PC Eip #endif // AMD64 extern LONG WINAPI topLevelExceptionFilter(_EXCEPTION_POINTERS* ); // Install a win32 structured exception handler around thread. void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) { __try { #ifndef AMD64 // We store the current thread in this wrapperthread location // and determine how far away this address is from the structured // execption pointer that FS:[0] points to. This get_thread // code can then get the thread pointer via FS. // // Warning: This routine must NEVER be inlined since we'd end up with // multiple offsets. // volatile Thread* wrapperthread = thread; if ( ThreadLocalStorage::get_thread_ptr_offset() == 0 ) { int thread_ptr_offset; __asm { lea eax, dword ptr wrapperthread; sub eax, dword ptr FS:[0H]; mov thread_ptr_offset, eax }; ThreadLocalStorage::set_thread_ptr_offset(thread_ptr_offset); } #ifdef ASSERT // Verify that the offset hasn't changed since we initally captured // it. This might happen if we accidentally ended up with an // inlined version of this routine. else { int test_thread_ptr_offset; __asm { lea eax, dword ptr wrapperthread; sub eax, dword ptr FS:[0H]; mov test_thread_ptr_offset, eax }; assert(test_thread_ptr_offset == ThreadLocalStorage::get_thread_ptr_offset(), "thread pointer offset from SEH changed"); } #endif // ASSERT #endif // !AMD64 f(value, method, args, thread); } __except(topLevelExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { // Nothing to do. } } #ifdef AMD64 // This is the language specific handler for exceptions // originating from dynamically generated code. // We call the standard structured exception handler // We only expect Continued Execution since we cannot unwind // from generated code. LONG HandleExceptionFromCodeCache( IN PEXCEPTION_RECORD ExceptionRecord, IN ULONG64 EstablisherFrame, IN OUT PCONTEXT ContextRecord, IN OUT PDISPATCHER_CONTEXT DispatcherContext) { EXCEPTION_POINTERS ep; LONG result; ep.ExceptionRecord = ExceptionRecord; ep.ContextRecord = ContextRecord; result = topLevelExceptionFilter(&ep); // We better only get a CONTINUE_EXECUTION from our handler // since we don't have unwind information registered. guarantee( result == EXCEPTION_CONTINUE_EXECUTION, "Unexpected result from topLevelExceptionFilter"); return(ExceptionContinueExecution); } // Structure containing the Windows Data Structures required // to register our Code Cache exception handler. // We put these in the CodeCache since the API requires // all addresses in these structures are relative to the Code // area registered with RtlAddFunctionTable. typedef struct { char ExceptionHandlerInstr[16]; // jmp HandleExceptionFromCodeCache RUNTIME_FUNCTION rt; UNWIND_INFO_EH_ONLY unw; } DynamicCodeData, *pDynamicCodeData; #endif // AMD64 // // Register our CodeCache area with the OS so it will dispatch exceptions // to our topLevelExceptionFilter when we take an exception in our // dynamically generated code. // // Arguments: low and high are the address of the full reserved // codeCache area // bool os::register_code_area(char *low, char *high) { #ifdef AMD64 ResourceMark rm; pDynamicCodeData pDCD; PRUNTIME_FUNCTION prt; PUNWIND_INFO_EH_ONLY punwind; // If we are using Vectored Exceptions we don't need this registration if (UseVectoredExceptions) return true; BufferBlob* b = BufferBlob::create("CodeCache Exception Handler", sizeof (DynamicCodeData)); CodeBuffer cb(b->instructions_begin(), b->instructions_size()); MacroAssembler* masm = new MacroAssembler(&cb); pDCD = (pDynamicCodeData) masm->pc(); masm->jump(ExternalAddress((address)&HandleExceptionFromCodeCache)); masm->flush(); // Create an Unwind Structure specifying no unwind info // other than an Exception Handler punwind = &pDCD->unw; punwind->Version = 1; punwind->Flags = UNW_FLAG_EHANDLER; punwind->SizeOfProlog = 0; punwind->CountOfCodes = 0; punwind->FrameRegister = 0; punwind->FrameOffset = 0; punwind->ExceptionHandler = (char *)(&(pDCD->ExceptionHandlerInstr[0])) - (char*)low; punwind->ExceptionData[0] = 0; // This structure describes the covered dynamic code area. // Addresses are relative to the beginning on the code cache area prt = &pDCD->rt; prt->BeginAddress = 0; prt->EndAddress = (ULONG)(high - low); prt->UnwindData = ((char *)punwind - low); guarantee(RtlAddFunctionTable(prt, 1, (ULONGLONG)low), "Failed to register Dynamic Code Exception Handler with RtlAddFunctionTable"); #endif // AMD64 return true; } void os::initialize_thread() { // Nothing to do. } // Atomics and Stub Functions typedef jint xchg_func_t (jint, volatile jint*); typedef intptr_t xchg_ptr_func_t (intptr_t, volatile intptr_t*); typedef jint cmpxchg_func_t (jint, volatile jint*, jint); typedef jlong cmpxchg_long_func_t (jlong, volatile jlong*, jlong); typedef jint add_func_t (jint, volatile jint*); typedef intptr_t add_ptr_func_t (intptr_t, volatile intptr_t*); typedef void fence_func_t (); #ifdef AMD64 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) { // try to use the stub: xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry()); if (func != NULL) { os::atomic_xchg_func = func; return (*func)(exchange_value, dest); } assert(Threads::number_of_threads() == 0, "for bootstrap only"); jint old_value = *dest; *dest = exchange_value; return old_value; } intptr_t os::atomic_xchg_ptr_bootstrap(intptr_t exchange_value, volatile intptr_t* dest) { // try to use the stub: xchg_ptr_func_t* func = CAST_TO_FN_PTR(xchg_ptr_func_t*, StubRoutines::atomic_xchg_ptr_entry()); if (func != NULL) { os::atomic_xchg_ptr_func = func; return (*func)(exchange_value, dest); } assert(Threads::number_of_threads() == 0, "for bootstrap only"); intptr_t old_value = *dest; *dest = exchange_value; return old_value; } jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) { // try to use the stub: cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry()); if (func != NULL) { os::atomic_cmpxchg_func = func; return (*func)(exchange_value, dest, compare_value); } assert(Threads::number_of_threads() == 0, "for bootstrap only"); jint old_value = *dest; if (old_value == compare_value) *dest = exchange_value; return old_value; } #endif // AMD64 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) { // try to use the stub: cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry()); if (func != NULL) { os::atomic_cmpxchg_long_func = func; return (*func)(exchange_value, dest, compare_value); } assert(Threads::number_of_threads() == 0, "for bootstrap only"); jlong old_value = *dest; if (old_value == compare_value) *dest = exchange_value; return old_value; } #ifdef AMD64 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) { // try to use the stub: add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry()); if (func != NULL) { os::atomic_add_func = func; return (*func)(add_value, dest); } assert(Threads::number_of_threads() == 0, "for bootstrap only"); return (*dest) += add_value; } intptr_t os::atomic_add_ptr_bootstrap(intptr_t add_value, volatile intptr_t* dest) { // try to use the stub: add_ptr_func_t* func = CAST_TO_FN_PTR(add_ptr_func_t*, StubRoutines::atomic_add_ptr_entry()); if (func != NULL) { os::atomic_add_ptr_func = func; return (*func)(add_value, dest); } assert(Threads::number_of_threads() == 0, "for bootstrap only"); return (*dest) += add_value; } void os::fence_bootstrap() { // try to use the stub: fence_func_t* func = CAST_TO_FN_PTR(fence_func_t*, StubRoutines::fence_entry()); if (func != NULL) { os::fence_func = func; (*func)(); return; } assert(Threads::number_of_threads() == 0, "for bootstrap only"); // don't have to do anything for a single thread } xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap; xchg_ptr_func_t* os::atomic_xchg_ptr_func = os::atomic_xchg_ptr_bootstrap; cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap; add_func_t* os::atomic_add_func = os::atomic_add_bootstrap; add_ptr_func_t* os::atomic_add_ptr_func = os::atomic_add_ptr_bootstrap; fence_func_t* os::fence_func = os::fence_bootstrap; #endif // AMD64 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap; ExtendedPC os::fetch_frame_from_context(void* ucVoid, intptr_t** ret_sp, intptr_t** ret_fp) { ExtendedPC epc; CONTEXT* uc = (CONTEXT*)ucVoid; if (uc != NULL) { epc = ExtendedPC((address)uc->REG_PC); if (ret_sp) *ret_sp = (intptr_t*)uc->REG_SP; if (ret_fp) *ret_fp = (intptr_t*)uc->REG_FP; } else { // construct empty ExtendedPC for return value checking epc = ExtendedPC(NULL); if (ret_sp) *ret_sp = (intptr_t *)NULL; if (ret_fp) *ret_fp = (intptr_t *)NULL; } return epc; } frame os::fetch_frame_from_context(void* ucVoid) { intptr_t* sp; intptr_t* fp; ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); return frame(sp, fp, epc.pc()); } // VC++ does not save frame pointer on stack in optimized build. It // can be turned off by /Oy-. If we really want to walk C frames, // we can use the StackWalk() API. frame os::get_sender_for_C_frame(frame* fr) { return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); } #ifndef AMD64 intptr_t* _get_previous_fp() { intptr_t **frameptr; __asm { mov frameptr, ebp }; return *frameptr; } #endif // !AMD64 frame os::current_frame() { #ifdef AMD64 // apparently _asm not supported on windows amd64 typedef intptr_t* get_fp_func (); get_fp_func* func = CAST_TO_FN_PTR(get_fp_func*, StubRoutines::x86::get_previous_fp_entry()); if (func == NULL) return frame(NULL, NULL, NULL); intptr_t* fp = (*func)(); #else intptr_t* fp = _get_previous_fp(); #endif // AMD64 frame myframe((intptr_t*)os::current_stack_pointer(), (intptr_t*)fp, CAST_FROM_FN_PTR(address, os::current_frame)); if (os::is_first_C_frame(&myframe)) { // stack is not walkable return frame(NULL, NULL, NULL); } else { return os::get_sender_for_C_frame(&myframe); } } void os::print_context(outputStream *st, void *context) { if (context == NULL) return; CONTEXT* uc = (CONTEXT*)context; st->print_cr("Registers:"); #ifdef AMD64 st->print( "EAX=" INTPTR_FORMAT, uc->Rax); st->print(", EBX=" INTPTR_FORMAT, uc->Rbx); st->print(", ECX=" INTPTR_FORMAT, uc->Rcx); st->print(", EDX=" INTPTR_FORMAT, uc->Rdx); st->cr(); st->print( "ESP=" INTPTR_FORMAT, uc->Rsp); st->print(", EBP=" INTPTR_FORMAT, uc->Rbp); st->print(", ESI=" INTPTR_FORMAT, uc->Rsi); st->print(", EDI=" INTPTR_FORMAT, uc->Rdi); st->cr(); st->print( "EIP=" INTPTR_FORMAT, uc->Rip); st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags); #else st->print( "EAX=" INTPTR_FORMAT, uc->Eax); st->print(", EBX=" INTPTR_FORMAT, uc->Ebx); st->print(", ECX=" INTPTR_FORMAT, uc->Ecx); st->print(", EDX=" INTPTR_FORMAT, uc->Edx); st->cr(); st->print( "ESP=" INTPTR_FORMAT, uc->Esp); st->print(", EBP=" INTPTR_FORMAT, uc->Ebp); st->print(", ESI=" INTPTR_FORMAT, uc->Esi); st->print(", EDI=" INTPTR_FORMAT, uc->Edi); st->cr(); st->print( "EIP=" INTPTR_FORMAT, uc->Eip); st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags); #endif // AMD64 st->cr(); st->cr(); intptr_t *sp = (intptr_t *)uc->REG_SP; st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t)); st->cr(); // Note: it may be unsafe to inspect memory near pc. For example, pc may // point to garbage if entry point in an nmethod is corrupted. Leave // this at the end, and hope for the best. address pc = (address)uc->REG_PC; st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); print_hex_dump(st, pc - 16, pc + 16, sizeof(char)); st->cr(); } extern "C" int SafeFetch32 (int * adr, int Err) { int rv = Err ; _try { rv = *((volatile int *) adr) ; } __except(EXCEPTION_EXECUTE_HANDLER) { } return rv ; } extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t Err) { intptr_t rv = Err ; _try { rv = *((volatile intptr_t *) adr) ; } __except(EXCEPTION_EXECUTE_HANDLER) { } return rv ; } extern "C" int SpinPause () { #ifdef AMD64 return 0 ; #else // pause == rep:nop // On systems that don't support pause a rep:nop // is executed as a nop. The rep: prefix is ignored. _asm { pause ; }; return 1 ; #endif // AMD64 } void os::setup_fpu() { #ifndef AMD64 int fpu_cntrl_word = StubRoutines::fpu_cntrl_wrd_std(); __asm fldcw fpu_cntrl_word; #endif // !AMD64 }