3bfdaa2a47
to execute expressions even in the absence of a process. This allows expressions to run in situations where the target cannot run -- e.g., to perform calculations based on type information, or to inspect a binary's static data. This modification touches the following files: lldb-private-enumerations.h Introduce a new enum specifying the policy for processing an expression. Some expressions should always be JITted, for example if they are functions that will be used over and over again. Some expressions should always be interpreted, for example if the target is unsafe to run. For most, it is acceptable to JIT them, but interpretation is preferable when possible. Target.[h,cpp] Have EvaluateExpression now accept the new enum. ClangExpressionDeclMap.[cpp,h] Add support for the IR interpreter and also make the ClangExpressionDeclMap more robust in the absence of a process. ClangFunction.[cpp,h] Add support for the new enum. IRInterpreter.[cpp,h] New implementation. ClangUserExpression.[cpp,h] Add support for the new enum, and for running expressions in the absence of a process. ClangExpression.h Remove references to the old DWARF-based method of evaluating expressions, because it has been superseded for now. ClangUtilityFunction.[cpp,h] Add support for the new enum. ClangExpressionParser.[cpp,h] Add support for the new enum, remove references to DWARF, and add support for checking whether the expression could be evaluated statically. IRForTarget.[h,cpp] Add support for the new enum, and add utility functions to support the interpreter. IRToDWARF.cpp Removed CommandObjectExpression.cpp Remove references to the obsolete -i option. Process.cpp Modify calls to ClangUserExpression::Evaluate to pass the correct enum (for dlopen/dlclose) SBValue.cpp Add support for the new enum. SBFrame.cpp Add support for he new enum. BreakpointOptions.cpp Add support for the new enum. llvm-svn: 139772
578 lines
18 KiB
C++
578 lines
18 KiB
C++
//===-- StopInfo.cpp ---------------------------------------------*- C++ -*-===//
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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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#include "lldb/Target/StopInfo.h"
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// C Includes
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// C++ Includes
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#include <string>
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// Other libraries and framework includes
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// Project includes
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#include "lldb/Core/Log.h"
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#include "lldb/Breakpoint/Breakpoint.h"
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#include "lldb/Breakpoint/BreakpointLocation.h"
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#include "lldb/Breakpoint/StoppointCallbackContext.h"
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#include "lldb/Core/Debugger.h"
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#include "lldb/Core/StreamString.h"
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#include "lldb/Expression/ClangUserExpression.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/Thread.h"
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#include "lldb/Target/ThreadPlan.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/UnixSignals.h"
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using namespace lldb;
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using namespace lldb_private;
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StopInfo::StopInfo (Thread &thread, uint64_t value) :
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m_thread (thread),
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m_stop_id (thread.GetProcess().GetStopID()),
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m_value (value)
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{
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}
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bool
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StopInfo::IsValid () const
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{
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return m_thread.GetProcess().GetStopID() == m_stop_id;
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}
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void
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StopInfo::MakeStopInfoValid ()
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{
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m_stop_id = m_thread.GetProcess().GetStopID();
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}
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lldb::StateType
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StopInfo::GetPrivateState ()
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{
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return m_thread.GetProcess().GetPrivateState();
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}
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//----------------------------------------------------------------------
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// StopInfoBreakpoint
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//----------------------------------------------------------------------
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namespace lldb_private
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{
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class StopInfoBreakpoint : public StopInfo
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{
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public:
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StopInfoBreakpoint (Thread &thread, break_id_t break_id) :
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StopInfo (thread, break_id),
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m_description(),
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m_should_stop (false),
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m_should_stop_is_valid (false),
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m_should_perform_action (true)
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{
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}
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StopInfoBreakpoint (Thread &thread, break_id_t break_id, bool should_stop) :
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StopInfo (thread, break_id),
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m_description(),
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m_should_stop (should_stop),
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m_should_stop_is_valid (true),
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m_should_perform_action (true)
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{
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}
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virtual ~StopInfoBreakpoint ()
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{
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}
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virtual StopReason
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GetStopReason () const
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{
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return eStopReasonBreakpoint;
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}
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virtual bool
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ShouldStop (Event *event_ptr)
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{
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if (!m_should_stop_is_valid)
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{
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// Only check once if we should stop at a breakpoint
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BreakpointSiteSP bp_site_sp (m_thread.GetProcess().GetBreakpointSiteList().FindByID (m_value));
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if (bp_site_sp)
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{
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StoppointCallbackContext context (event_ptr,
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&m_thread.GetProcess(),
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&m_thread,
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m_thread.GetStackFrameAtIndex(0).get(),
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true);
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m_should_stop = bp_site_sp->ShouldStop (&context);
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}
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else
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{
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LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS));
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if (log)
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log->Printf ("Process::%s could not find breakpoint site id: %lld...", __FUNCTION__, m_value);
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m_should_stop = true;
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}
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m_should_stop_is_valid = true;
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}
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return m_should_stop;
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}
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virtual void
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PerformAction (Event *event_ptr)
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{
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if (!m_should_perform_action)
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return;
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m_should_perform_action = false;
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LogSP log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS);
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// We're going to calculate whether we should stop or not in some way during the course of
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// this code. So set the valid flag here. Also by default we're going to stop, so
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// set that here too.
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// m_should_stop_is_valid = true;
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m_should_stop = true;
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BreakpointSiteSP bp_site_sp (m_thread.GetProcess().GetBreakpointSiteList().FindByID (m_value));
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if (bp_site_sp)
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{
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size_t num_owners = bp_site_sp->GetNumberOfOwners();
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// We only continue from the callbacks if ALL the callbacks want us to continue.
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// However we want to run all the callbacks, except of course if one of them actually
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// resumes the target.
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// So we use stop_requested to track what we're were asked to do.
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bool stop_requested = true;
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for (size_t j = 0; j < num_owners; j++)
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{
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lldb::BreakpointLocationSP bp_loc_sp = bp_site_sp->GetOwnerAtIndex(j);
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StoppointCallbackContext context (event_ptr,
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&m_thread.GetProcess(),
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&m_thread,
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m_thread.GetStackFrameAtIndex(0).get(),
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false);
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stop_requested = bp_loc_sp->InvokeCallback (&context);
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// Also make sure that the callback hasn't continued the target.
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// If it did, when we'll set m_should_start to false and get out of here.
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if (GetPrivateState() == eStateRunning)
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m_should_stop = false;
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}
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if (m_should_stop && !stop_requested)
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{
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m_should_stop_is_valid = true;
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m_should_stop = false;
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}
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// Okay, so now if all the callbacks say we should stop, let's try the Conditions:
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if (m_should_stop)
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{
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size_t num_owners = bp_site_sp->GetNumberOfOwners();
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for (size_t j = 0; j < num_owners; j++)
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{
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lldb::BreakpointLocationSP bp_loc_sp = bp_site_sp->GetOwnerAtIndex(j);
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if (bp_loc_sp->GetConditionText() != NULL)
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{
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// We need to make sure the user sees any parse errors in their condition, so we'll hook the
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// constructor errors up to the debugger's Async I/O.
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StoppointCallbackContext context (event_ptr,
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&m_thread.GetProcess(),
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&m_thread,
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m_thread.GetStackFrameAtIndex(0).get(),
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false);
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ValueObjectSP result_valobj_sp;
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ExecutionResults result_code;
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ValueObjectSP result_value_sp;
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const bool discard_on_error = true;
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Error error;
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result_code = ClangUserExpression::EvaluateWithError (context.exe_ctx,
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eExecutionPolicyAlways,
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discard_on_error,
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bp_loc_sp->GetConditionText(),
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NULL,
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result_value_sp,
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error);
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if (result_code == eExecutionCompleted)
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{
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if (result_value_sp)
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{
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Scalar scalar_value;
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if (result_value_sp->ResolveValue (scalar_value))
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{
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if (scalar_value.ULongLong(1) == 0)
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m_should_stop = false;
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else
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m_should_stop = true;
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if (log)
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log->Printf("Condition successfully evaluated, result is %s.\n",
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m_should_stop ? "true" : "false");
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}
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else
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{
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m_should_stop = true;
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if (log)
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log->Printf("Failed to get an integer result from the expression.");
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}
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}
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}
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else
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{
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Debugger &debugger = context.exe_ctx.target->GetDebugger();
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StreamSP error_sp = debugger.GetAsyncErrorStream ();
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error_sp->Printf ("Stopped due to an error evaluating condition of breakpoint ");
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bp_loc_sp->GetDescription (error_sp.get(), eDescriptionLevelBrief);
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error_sp->Printf (": \"%s\"",
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bp_loc_sp->GetConditionText());
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error_sp->EOL();
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const char *err_str = error.AsCString("<Unknown Error>");
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if (log)
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log->Printf("Error evaluating condition: \"%s\"\n", err_str);
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error_sp->PutCString (err_str);
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error_sp->EOL();
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error_sp->Flush();
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// If the condition fails to be parsed or run, we should stop.
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m_should_stop = true;
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}
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}
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// If any condition says we should stop, then we're going to stop, so we don't need
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// to evaluate the others.
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if (m_should_stop)
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break;
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}
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}
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}
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else
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{
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LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS));
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if (log)
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log->Printf ("Process::%s could not find breakpoint site id: %lld...", __FUNCTION__, m_value);
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}
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if (log)
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log->Printf ("Process::%s returning from action with m_should_stop: %d.", __FUNCTION__, m_should_stop);
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}
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virtual bool
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ShouldNotify (Event *event_ptr)
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{
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BreakpointSiteSP bp_site_sp (m_thread.GetProcess().GetBreakpointSiteList().FindByID (m_value));
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if (bp_site_sp)
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{
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bool all_internal = true;
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for (uint32_t i = 0; i < bp_site_sp->GetNumberOfOwners(); i++)
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{
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if (!bp_site_sp->GetOwnerAtIndex(i)->GetBreakpoint().IsInternal())
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{
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all_internal = false;
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break;
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}
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}
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return all_internal == false;
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}
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return true;
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}
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virtual const char *
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GetDescription ()
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{
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if (m_description.empty())
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{
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BreakpointSiteSP bp_site_sp (m_thread.GetProcess().GetBreakpointSiteList().FindByID (m_value));
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if (bp_site_sp)
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{
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StreamString strm;
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strm.Printf("breakpoint ");
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bp_site_sp->GetDescription(&strm, eDescriptionLevelBrief);
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m_description.swap (strm.GetString());
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}
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else
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{
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StreamString strm;
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strm.Printf("breakpoint site %lli", m_value);
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m_description.swap (strm.GetString());
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}
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}
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return m_description.c_str();
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}
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private:
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std::string m_description;
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bool m_should_stop;
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bool m_should_stop_is_valid;
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bool m_should_perform_action; // Since we are trying to preserve the "state" of the system even if we run functions
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// etc. behind the users backs, we need to make sure we only REALLY perform the action once.
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};
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//----------------------------------------------------------------------
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// StopInfoWatchpoint
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//----------------------------------------------------------------------
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class StopInfoWatchpoint : public StopInfo
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{
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public:
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StopInfoWatchpoint (Thread &thread, break_id_t watch_id) :
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StopInfo (thread, watch_id),
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m_description()
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{
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}
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virtual ~StopInfoWatchpoint ()
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{
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}
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virtual StopReason
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GetStopReason () const
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{
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return eStopReasonWatchpoint;
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}
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virtual const char *
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GetDescription ()
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{
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if (m_description.empty())
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{
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StreamString strm;
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strm.Printf("watchpoint %lli", m_value);
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m_description.swap (strm.GetString());
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}
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return m_description.c_str();
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}
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private:
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std::string m_description;
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};
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//----------------------------------------------------------------------
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// StopInfoUnixSignal
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//----------------------------------------------------------------------
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class StopInfoUnixSignal : public StopInfo
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{
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public:
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StopInfoUnixSignal (Thread &thread, int signo) :
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StopInfo (thread, signo)
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{
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}
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virtual ~StopInfoUnixSignal ()
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{
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}
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virtual StopReason
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GetStopReason () const
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{
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return eStopReasonSignal;
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}
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virtual bool
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ShouldStop (Event *event_ptr)
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{
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return m_thread.GetProcess().GetUnixSignals().GetShouldStop (m_value);
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}
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// If should stop returns false, check if we should notify of this event
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virtual bool
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ShouldNotify (Event *event_ptr)
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{
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return m_thread.GetProcess().GetUnixSignals().GetShouldNotify (m_value);
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}
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virtual void
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WillResume (lldb::StateType resume_state)
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{
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if (m_thread.GetProcess().GetUnixSignals().GetShouldSuppress(m_value) == false)
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m_thread.SetResumeSignal(m_value);
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}
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virtual const char *
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GetDescription ()
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{
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if (m_description.empty())
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{
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StreamString strm;
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const char *signal_name = m_thread.GetProcess().GetUnixSignals().GetSignalAsCString (m_value);
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if (signal_name)
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strm.Printf("signal %s", signal_name);
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else
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strm.Printf("signal %lli", m_value);
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m_description.swap (strm.GetString());
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}
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return m_description.c_str();
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}
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};
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//----------------------------------------------------------------------
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// StopInfoTrace
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//----------------------------------------------------------------------
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class StopInfoTrace : public StopInfo
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{
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public:
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StopInfoTrace (Thread &thread) :
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StopInfo (thread, LLDB_INVALID_UID)
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{
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}
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virtual ~StopInfoTrace ()
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{
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}
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virtual StopReason
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GetStopReason () const
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{
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return eStopReasonTrace;
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}
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virtual const char *
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GetDescription ()
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{
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if (m_description.empty())
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return "trace";
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else
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return m_description.c_str();
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}
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};
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//----------------------------------------------------------------------
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// StopInfoException
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//----------------------------------------------------------------------
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class StopInfoException : public StopInfo
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{
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public:
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StopInfoException (Thread &thread, const char *description) :
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StopInfo (thread, LLDB_INVALID_UID)
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{
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if (description)
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SetDescription (description);
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}
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virtual
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~StopInfoException ()
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{
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}
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virtual StopReason
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GetStopReason () const
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{
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return eStopReasonException;
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}
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virtual const char *
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GetDescription ()
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{
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if (m_description.empty())
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return "exception";
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else
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return m_description.c_str();
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}
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};
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//----------------------------------------------------------------------
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// StopInfoThreadPlan
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//----------------------------------------------------------------------
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class StopInfoThreadPlan : public StopInfo
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{
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public:
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StopInfoThreadPlan (ThreadPlanSP &plan_sp) :
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StopInfo (plan_sp->GetThread(), LLDB_INVALID_UID),
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m_plan_sp (plan_sp)
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{
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}
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virtual ~StopInfoThreadPlan ()
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{
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}
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virtual StopReason
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GetStopReason () const
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{
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return eStopReasonPlanComplete;
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}
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virtual const char *
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GetDescription ()
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{
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if (m_description.empty())
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{
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StreamString strm;
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m_plan_sp->GetDescription (&strm, eDescriptionLevelBrief);
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m_description.swap (strm.GetString());
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}
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return m_description.c_str();
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}
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private:
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ThreadPlanSP m_plan_sp;
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};
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} // namespace lldb_private
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StopInfoSP
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StopInfo::CreateStopReasonWithBreakpointSiteID (Thread &thread, break_id_t break_id)
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{
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return StopInfoSP (new StopInfoBreakpoint (thread, break_id));
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}
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StopInfoSP
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StopInfo::CreateStopReasonWithBreakpointSiteID (Thread &thread, break_id_t break_id, bool should_stop)
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{
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return StopInfoSP (new StopInfoBreakpoint (thread, break_id, should_stop));
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}
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StopInfoSP
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StopInfo::CreateStopReasonWithWatchpointID (Thread &thread, break_id_t watch_id)
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{
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return StopInfoSP (new StopInfoWatchpoint (thread, watch_id));
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}
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StopInfoSP
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StopInfo::CreateStopReasonWithSignal (Thread &thread, int signo)
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{
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return StopInfoSP (new StopInfoUnixSignal (thread, signo));
|
|
}
|
|
|
|
StopInfoSP
|
|
StopInfo::CreateStopReasonToTrace (Thread &thread)
|
|
{
|
|
return StopInfoSP (new StopInfoTrace (thread));
|
|
}
|
|
|
|
StopInfoSP
|
|
StopInfo::CreateStopReasonWithPlan (ThreadPlanSP &plan_sp)
|
|
{
|
|
return StopInfoSP (new StopInfoThreadPlan (plan_sp));
|
|
}
|
|
|
|
StopInfoSP
|
|
StopInfo::CreateStopReasonWithException (Thread &thread, const char *description)
|
|
{
|
|
return StopInfoSP (new StopInfoException (thread, description));
|
|
}
|