2013-05-20 18:57:53 +08:00
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//=-- lsan_thread.cc ------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of LeakSanitizer.
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// See lsan_thread.h for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lsan_thread.h"
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_placement_new.h"
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#include "sanitizer_common/sanitizer_thread_registry.h"
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#include "lsan_allocator.h"
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namespace __lsan {
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const u32 kInvalidTid = (u32) -1;
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static ThreadRegistry *thread_registry;
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static THREADLOCAL u32 current_thread_tid = kInvalidTid;
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static ThreadContextBase *CreateThreadContext(u32 tid) {
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void *mem = MmapOrDie(sizeof(ThreadContext), "ThreadContext");
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return new(mem) ThreadContext(tid);
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}
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static const uptr kMaxThreads = 1 << 13;
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static const uptr kThreadQuarantineSize = 64;
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void InitializeThreadRegistry() {
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static char thread_registry_placeholder[sizeof(ThreadRegistry)] ALIGNED(64);
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thread_registry = new(thread_registry_placeholder)
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ThreadRegistry(CreateThreadContext, kMaxThreads, kThreadQuarantineSize);
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}
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u32 GetCurrentThread() {
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return current_thread_tid;
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}
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void SetCurrentThread(u32 tid) {
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current_thread_tid = tid;
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}
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ThreadContext::ThreadContext(int tid)
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: ThreadContextBase(tid),
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stack_begin_(0),
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stack_end_(0),
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cache_begin_(0),
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cache_end_(0),
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tls_begin_(0),
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tls_end_(0) {}
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struct OnStartedArgs {
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uptr stack_begin, stack_end,
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cache_begin, cache_end,
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tls_begin, tls_end;
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};
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void ThreadContext::OnStarted(void *arg) {
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OnStartedArgs *args = reinterpret_cast<OnStartedArgs *>(arg);
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stack_begin_ = args->stack_begin;
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stack_end_ = args->stack_end;
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tls_begin_ = args->tls_begin;
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tls_end_ = args->tls_end;
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cache_begin_ = args->cache_begin;
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cache_end_ = args->cache_end;
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}
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void ThreadContext::OnFinished() {
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AllocatorThreadFinish();
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}
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u32 ThreadCreate(u32 parent_tid, uptr user_id, bool detached) {
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return thread_registry->CreateThread(user_id, detached, parent_tid,
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/* arg */ 0);
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}
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void ThreadStart(u32 tid, uptr os_id) {
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OnStartedArgs args;
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uptr stack_size = 0;
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uptr tls_size = 0;
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GetThreadStackAndTls(tid == 0, &args.stack_begin, &stack_size,
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&args.tls_begin, &tls_size);
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args.stack_end = args.stack_begin + stack_size;
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args.tls_end = args.tls_begin + tls_size;
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GetAllocatorCacheRange(&args.cache_begin, &args.cache_end);
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thread_registry->StartThread(tid, os_id, &args);
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}
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void ThreadFinish() {
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thread_registry->FinishThread(GetCurrentThread());
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}
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ThreadContext *CurrentThreadContext() {
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if (!thread_registry) return 0;
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if (GetCurrentThread() == kInvalidTid)
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return 0;
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// No lock needed when getting current thread.
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return (ThreadContext *)thread_registry->GetThreadLocked(GetCurrentThread());
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}
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static bool FindThreadByUid(ThreadContextBase *tctx, void *arg) {
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uptr uid = (uptr)arg;
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if (tctx->user_id == uid && tctx->status != ThreadStatusInvalid) {
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return true;
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}
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return false;
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}
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u32 ThreadTid(uptr uid) {
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return thread_registry->FindThread(FindThreadByUid, (void*)uid);
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}
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void ThreadJoin(u32 tid) {
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CHECK_NE(tid, kInvalidTid);
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thread_registry->JoinThread(tid, /* arg */0);
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}
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///// Interface to the common LSan module. /////
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bool GetThreadRangesLocked(uptr os_id, uptr *stack_begin, uptr *stack_end,
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uptr *tls_begin, uptr *tls_end,
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uptr *cache_begin, uptr *cache_end) {
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2013-05-27 18:35:51 +08:00
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ThreadContext *context = static_cast<ThreadContext *>(
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thread_registry->FindThreadContextByOsIDLocked(os_id));
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if (!context) return false;
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2013-05-20 18:57:53 +08:00
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*stack_begin = context->stack_begin();
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*stack_end = context->stack_end();
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*tls_begin = context->tls_begin();
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*tls_end = context->tls_end();
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*cache_begin = context->cache_begin();
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*cache_end = context->cache_end();
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return true;
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}
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void LockThreadRegistry() {
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thread_registry->Lock();
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}
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void UnlockThreadRegistry() {
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thread_registry->Unlock();
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}
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} // namespace __lsan
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