From 56f77a7570d96aa4c6afb7ab26e58925b2506f86 Mon Sep 17 00:00:00 2001
From: Sergey Matveev <earthdok@google.com>
Date: Mon, 20 May 2013 10:57:53 +0000
Subject: [lsan] Thread registry for standalone LSan.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@182246 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/lsan/lsan_thread.cc | 163 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 lib/lsan/lsan_thread.cc

(limited to 'lib/lsan/lsan_thread.cc')

diff --git a/lib/lsan/lsan_thread.cc b/lib/lsan/lsan_thread.cc
new file mode 100644
index 000000000..3a60036a9
--- /dev/null
+++ b/lib/lsan/lsan_thread.cc
@@ -0,0 +1,163 @@
+//=-- lsan_thread.cc ------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of LeakSanitizer.
+// See lsan_thread.h for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "lsan_thread.h"
+
+#include "sanitizer_common/sanitizer_common.h"
+#include "sanitizer_common/sanitizer_placement_new.h"
+#include "sanitizer_common/sanitizer_thread_registry.h"
+#include "lsan_allocator.h"
+
+namespace __lsan {
+
+const u32 kInvalidTid = (u32) -1;
+
+static ThreadRegistry *thread_registry;
+static THREADLOCAL u32 current_thread_tid = kInvalidTid;
+
+static ThreadContextBase *CreateThreadContext(u32 tid) {
+  void *mem = MmapOrDie(sizeof(ThreadContext), "ThreadContext");
+  return new(mem) ThreadContext(tid);
+}
+
+static const uptr kMaxThreads = 1 << 13;
+static const uptr kThreadQuarantineSize = 64;
+
+void InitializeThreadRegistry() {
+  static char thread_registry_placeholder[sizeof(ThreadRegistry)] ALIGNED(64);
+  thread_registry = new(thread_registry_placeholder)
+    ThreadRegistry(CreateThreadContext, kMaxThreads, kThreadQuarantineSize);
+}
+
+u32 GetCurrentThread() {
+  return current_thread_tid;
+}
+
+void SetCurrentThread(u32 tid) {
+  current_thread_tid = tid;
+}
+
+ThreadContext::ThreadContext(int tid)
+  : ThreadContextBase(tid),
+    stack_begin_(0),
+    stack_end_(0),
+    cache_begin_(0),
+    cache_end_(0),
+    tls_begin_(0),
+    tls_end_(0) {}
+
+struct OnStartedArgs {
+  uptr stack_begin, stack_end,
+       cache_begin, cache_end,
+       tls_begin, tls_end;
+};
+
+void ThreadContext::OnStarted(void *arg) {
+  OnStartedArgs *args = reinterpret_cast<OnStartedArgs *>(arg);
+  stack_begin_ = args->stack_begin;
+  stack_end_ = args->stack_end;
+  tls_begin_ = args->tls_begin;
+  tls_end_ = args->tls_end;
+  cache_begin_ = args->cache_begin;
+  cache_end_ = args->cache_end;
+}
+
+void ThreadContext::OnFinished() {
+  AllocatorThreadFinish();
+}
+
+u32 ThreadCreate(u32 parent_tid, uptr user_id, bool detached) {
+  return thread_registry->CreateThread(user_id, detached, parent_tid,
+                                       /* arg */ 0);
+}
+
+void ThreadStart(u32 tid, uptr os_id) {
+  OnStartedArgs args;
+  uptr stack_size = 0;
+  uptr tls_size = 0;
+  GetThreadStackAndTls(tid == 0, &args.stack_begin, &stack_size,
+                       &args.tls_begin, &tls_size);
+  args.stack_end = args.stack_begin + stack_size;
+  args.tls_end = args.tls_begin + tls_size;
+  GetAllocatorCacheRange(&args.cache_begin, &args.cache_end);
+  thread_registry->StartThread(tid, os_id, &args);
+}
+
+void ThreadFinish() {
+  thread_registry->FinishThread(GetCurrentThread());
+}
+
+ThreadContext *CurrentThreadContext() {
+  if (!thread_registry) return 0;
+  if (GetCurrentThread() == kInvalidTid)
+    return 0;
+  // No lock needed when getting current thread.
+  return (ThreadContext *)thread_registry->GetThreadLocked(GetCurrentThread());
+}
+
+bool FindThreadByOsIdCallback(ThreadContextBase *tctx, void *arg) {
+  return (tctx->os_id == (uptr)arg && tctx->status != ThreadStatusInvalid &&
+      tctx->status != ThreadStatusDead);
+}
+
+ThreadContext *FindThreadByOsIDLocked(uptr os_id) {
+  ThreadContextBase *tctx =
+    thread_registry->FindThreadContextLocked(FindThreadByOsIdCallback,
+                                             (void*)os_id);
+  return static_cast<ThreadContext *>(tctx);
+}
+
+static bool FindThreadByUid(ThreadContextBase *tctx, void *arg) {
+  uptr uid = (uptr)arg;
+  if (tctx->user_id == uid && tctx->status != ThreadStatusInvalid) {
+    return true;
+  }
+  return false;
+}
+
+u32 ThreadTid(uptr uid) {
+  return thread_registry->FindThread(FindThreadByUid, (void*)uid);
+}
+
+void ThreadJoin(u32 tid) {
+  CHECK_NE(tid, kInvalidTid);
+  thread_registry->JoinThread(tid, /* arg */0);
+}
+
+///// Interface to the common LSan module. /////
+
+bool GetThreadRangesLocked(uptr os_id, uptr *stack_begin, uptr *stack_end,
+                           uptr *tls_begin, uptr *tls_end,
+                           uptr *cache_begin, uptr *cache_end) {
+  ThreadContext *context = FindThreadByOsIDLocked(os_id);
+  if (!context)
+    return false;
+  *stack_begin = context->stack_begin();
+  *stack_end = context->stack_end();
+  *tls_begin = context->tls_begin();
+  *tls_end = context->tls_end();
+  *cache_begin = context->cache_begin();
+  *cache_end = context->cache_end();
+  return true;
+}
+
+void LockThreadRegistry() {
+  thread_registry->Lock();
+}
+
+void UnlockThreadRegistry() {
+  thread_registry->Unlock();
+}
+
+}  // namespace __lsan
-- 
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