The Platform base class now maintains a list of trap handlers

aka asynchronous signal handlers, which subclasses should fill
in as appropriate.  For most Unix user process environments,
the one entry in this list is _sigtramp.  For bare-board and
kernel environments, there will be different sets of trap 
handlers.

The unwinder needs to know when a frame is a trap handler 
because the rules it enforces for the frame "above" the
trap handler is different from most middle-of-the-stack frames.

<rdar://problem/15835846> 

llvm-svn: 201300

6 files changed, 9 insertions, 1 deletions

diff --git a/lldb/source/Plugins/Platform/FreeBSD/PlatformFreeBSD.cpp b/lldb/source/Plugins/Platform/FreeBSD/PlatformFreeBSD.cpp
index a10c04f60b0..1ebb1435d8e 100644
--- a/lldb/source/Plugins/Platform/FreeBSD/PlatformFreeBSD.cpp
+++ b/lldb/source/Plugins/Platform/FreeBSD/PlatformFreeBSD.cpp
@@ -142,8 +142,10 @@ PlatformFreeBSD::Terminate ()
 /// Default Constructor
 //------------------------------------------------------------------
 PlatformFreeBSD::PlatformFreeBSD (bool is_host) :
-Platform(is_host)
+Platform(is_host),
+m_remote_platform_sp()
 {
+    m_trap_handlers.push_back (ConstString ("_sigtramp"));
 }
 
 //------------------------------------------------------------------
diff --git a/lldb/source/Plugins/Platform/Linux/PlatformLinux.cpp b/lldb/source/Plugins/Platform/Linux/PlatformLinux.cpp
index c30211c886a..3e42b6adb42 100644
--- a/lldb/source/Plugins/Platform/Linux/PlatformLinux.cpp
+++ b/lldb/source/Plugins/Platform/Linux/PlatformLinux.cpp
@@ -307,6 +307,7 @@ PlatformLinux::PlatformLinux (bool is_host) :
     Platform(is_host),  // This is the local host platform
     m_remote_platform_sp ()
 {
+    m_trap_handlers.push_back (ConstString ("_sigtramp"));
 }
 
 //------------------------------------------------------------------
diff --git a/lldb/source/Plugins/Platform/MacOSX/PlatformDarwin.cpp b/lldb/source/Plugins/Platform/MacOSX/PlatformDarwin.cpp
index 0f3833841f9..ff4e23596d8 100644
--- a/lldb/source/Plugins/Platform/MacOSX/PlatformDarwin.cpp
+++ b/lldb/source/Plugins/Platform/MacOSX/PlatformDarwin.cpp
@@ -40,6 +40,7 @@ PlatformDarwin::PlatformDarwin (bool is_host) :
     PlatformPOSIX(is_host),  // This is the local host platform
     m_developer_directory ()
 {
+    m_trap_handlers.push_back (ConstString ("_sigtramp"));
 }
 
 //------------------------------------------------------------------
diff --git a/lldb/source/Plugins/Platform/MacOSX/PlatformDarwinKernel.cpp b/lldb/source/Plugins/Platform/MacOSX/PlatformDarwinKernel.cpp
index 5e5a8aad465..6378f1a9ef8 100644
--- a/lldb/source/Plugins/Platform/MacOSX/PlatformDarwinKernel.cpp
+++ b/lldb/source/Plugins/Platform/MacOSX/PlatformDarwinKernel.cpp
@@ -257,6 +257,8 @@ PlatformDarwinKernel::PlatformDarwinKernel (lldb_private::LazyBool is_ios_debug_
     {
         SearchForKexts ();
     }
+    m_trap_handlers.push_back(ConstString ("trap_from_kernel"));
+    m_trap_handlers.push_back(ConstString ("hndl_double_fault"));
 }
 
 //------------------------------------------------------------------
diff --git a/lldb/source/Plugins/Platform/POSIX/PlatformPOSIX.cpp b/lldb/source/Plugins/Platform/POSIX/PlatformPOSIX.cpp
index b5f92dcc3dc..b9bf255f3d5 100644
--- a/lldb/source/Plugins/Platform/POSIX/PlatformPOSIX.cpp
+++ b/lldb/source/Plugins/Platform/POSIX/PlatformPOSIX.cpp
@@ -32,6 +32,7 @@ PlatformPOSIX::PlatformPOSIX (bool is_host) :
 Platform(is_host),  // This is the local host platform
 m_remote_platform_sp ()
 {
+    m_trap_handlers.push_back (ConstString ("_sigtramp"));
 }
 
 //------------------------------------------------------------------
diff --git a/lldb/source/Plugins/Platform/gdb-server/PlatformRemoteGDBServer.cpp b/lldb/source/Plugins/Platform/gdb-server/PlatformRemoteGDBServer.cpp
index 80421ad8b24..3b283625448 100644
--- a/lldb/source/Plugins/Platform/gdb-server/PlatformRemoteGDBServer.cpp
+++ b/lldb/source/Plugins/Platform/gdb-server/PlatformRemoteGDBServer.cpp
@@ -135,6 +135,7 @@ PlatformRemoteGDBServer::PlatformRemoteGDBServer () :
     Platform(false), // This is a remote platform
     m_gdb_client(true)
 {
+    m_trap_handlers.push_back (ConstString ("_sigtramp"));
 }
 
 //------------------------------------------------------------------