245 lines
8.4 KiB
C++
245 lines
8.4 KiB
C++
//===-- AppleThreadPlanStepThroughObjCTrampoline.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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// C Includes
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// C++ Includes
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// Other libraries and framework includes
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// Project includes
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#include "AppleThreadPlanStepThroughObjCTrampoline.h"
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#include "AppleObjCTrampolineHandler.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/Thread.h"
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#include "lldb/Expression/ClangExpression.h"
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#include "lldb/Expression/ClangFunction.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Target/ObjCLanguageRuntime.h"
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#include "lldb/Target/ThreadPlanRunToAddress.h"
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#include "lldb/Target/ThreadPlanStepOut.h"
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#include "lldb/Core/Log.h"
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using namespace lldb;
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using namespace lldb_private;
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//----------------------------------------------------------------------
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// ThreadPlanStepThroughObjCTrampoline constructor
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//----------------------------------------------------------------------
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AppleThreadPlanStepThroughObjCTrampoline::AppleThreadPlanStepThroughObjCTrampoline
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(
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Thread &thread,
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AppleObjCTrampolineHandler *trampoline_handler,
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ValueList &input_values,
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lldb::addr_t isa_addr,
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lldb::addr_t sel_addr,
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bool stop_others
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) :
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ThreadPlan (ThreadPlan::eKindGeneric,
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"MacOSX Step through ObjC Trampoline",
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thread,
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eVoteNoOpinion,
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eVoteNoOpinion),
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m_trampoline_handler (trampoline_handler),
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m_args_addr (LLDB_INVALID_ADDRESS),
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m_input_values (input_values),
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m_isa_addr(isa_addr),
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m_sel_addr(sel_addr),
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m_impl_function (NULL),
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m_stop_others (stop_others)
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{
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}
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//----------------------------------------------------------------------
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// Destructor
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//----------------------------------------------------------------------
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AppleThreadPlanStepThroughObjCTrampoline::~AppleThreadPlanStepThroughObjCTrampoline()
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{
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}
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void
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AppleThreadPlanStepThroughObjCTrampoline::DidPush ()
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{
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// Setting up the memory space for the called function text might require allocations,
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// i.e. a nested function call. This needs to be done as a PreResumeAction.
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m_thread.GetProcess()->AddPreResumeAction (PreResumeInitializeClangFunction, (void *) this);
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}
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bool
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AppleThreadPlanStepThroughObjCTrampoline::InitializeClangFunction ()
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{
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if (!m_func_sp)
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{
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StreamString errors;
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m_args_addr = m_trampoline_handler->SetupDispatchFunction(m_thread, m_input_values);
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if (m_args_addr == LLDB_INVALID_ADDRESS)
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{
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return false;
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}
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m_impl_function = m_trampoline_handler->GetLookupImplementationWrapperFunction();
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ExecutionContext exc_ctx;
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EvaluateExpressionOptions options;
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options.SetUnwindOnError(true);
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options.SetIgnoreBreakpoints(true);
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options.SetStopOthers(m_stop_others);
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m_thread.CalculateExecutionContext(exc_ctx);
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m_func_sp.reset(m_impl_function->GetThreadPlanToCallFunction (exc_ctx,
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m_args_addr,
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options,
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errors));
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m_func_sp->SetOkayToDiscard(true);
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m_thread.QueueThreadPlan (m_func_sp, false);
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}
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return true;
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}
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bool
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AppleThreadPlanStepThroughObjCTrampoline::PreResumeInitializeClangFunction(void *void_myself)
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{
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AppleThreadPlanStepThroughObjCTrampoline *myself = static_cast<AppleThreadPlanStepThroughObjCTrampoline *>(void_myself);
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return myself->InitializeClangFunction();
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}
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void
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AppleThreadPlanStepThroughObjCTrampoline::GetDescription (Stream *s,
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lldb::DescriptionLevel level)
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{
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if (level == lldb::eDescriptionLevelBrief)
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s->Printf("Step through ObjC trampoline");
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else
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{
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s->Printf ("Stepping to implementation of ObjC method - obj: 0x%llx, isa: 0x%" PRIx64 ", sel: 0x%" PRIx64,
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m_input_values.GetValueAtIndex(0)->GetScalar().ULongLong(), m_isa_addr, m_sel_addr);
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}
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}
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bool
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AppleThreadPlanStepThroughObjCTrampoline::ValidatePlan (Stream *error)
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{
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return true;
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}
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bool
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AppleThreadPlanStepThroughObjCTrampoline::DoPlanExplainsStop (Event *event_ptr)
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{
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// If we get asked to explain the stop it will be because something went
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// wrong (like the implementation for selector function crashed... We're going
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// to figure out what to do about that, so we do explain the stop.
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return true;
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}
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lldb::StateType
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AppleThreadPlanStepThroughObjCTrampoline::GetPlanRunState ()
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{
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return eStateRunning;
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}
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bool
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AppleThreadPlanStepThroughObjCTrampoline::ShouldStop (Event *event_ptr)
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{
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// First stage: we are still handling the "call a function to get the target of the dispatch"
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if (m_func_sp)
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{
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if (!m_func_sp->IsPlanComplete())
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{
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return false;
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}
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else
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{
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if (!m_func_sp->PlanSucceeded())
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{
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SetPlanComplete(false);
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return true;
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}
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m_func_sp.reset();
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}
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}
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// Second stage, if all went well with the function calling, then fetch the target address, and
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// queue up a "run to that address" plan.
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if (!m_run_to_sp)
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{
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Value target_addr_value;
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ExecutionContext exc_ctx;
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m_thread.CalculateExecutionContext(exc_ctx);
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m_impl_function->FetchFunctionResults (exc_ctx, m_args_addr, target_addr_value);
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m_impl_function->DeallocateFunctionResults(exc_ctx, m_args_addr);
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lldb::addr_t target_addr = target_addr_value.GetScalar().ULongLong();
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Address target_so_addr;
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target_so_addr.SetOpcodeLoadAddress(target_addr, exc_ctx.GetTargetPtr());
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Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
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if (target_addr == 0)
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{
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if (log)
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log->Printf("Got target implementation of 0x0, stopping.");
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SetPlanComplete();
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return true;
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}
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if (m_trampoline_handler->AddrIsMsgForward(target_addr))
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{
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if (log)
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log->Printf ("Implementation lookup returned msgForward function: 0x%" PRIx64 ", stopping.", target_addr);
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SymbolContext sc = m_thread.GetStackFrameAtIndex(0)->GetSymbolContext(eSymbolContextEverything);
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const bool abort_other_plans = false;
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const bool first_insn = true;
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const uint32_t frame_idx = 0;
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m_run_to_sp = m_thread.QueueThreadPlanForStepOutNoShouldStop (abort_other_plans,
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&sc,
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first_insn,
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m_stop_others,
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eVoteNoOpinion,
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eVoteNoOpinion,
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frame_idx);
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m_run_to_sp->SetPrivate(true);
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return false;
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}
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if (log)
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log->Printf("Running to ObjC method implementation: 0x%" PRIx64, target_addr);
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ObjCLanguageRuntime *objc_runtime = GetThread().GetProcess()->GetObjCLanguageRuntime();
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assert (objc_runtime != NULL);
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objc_runtime->AddToMethodCache (m_isa_addr, m_sel_addr, target_addr);
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if (log)
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log->Printf("Adding {isa-addr=0x%" PRIx64 ", sel-addr=0x%" PRIx64 "} = addr=0x%" PRIx64 " to cache.", m_isa_addr, m_sel_addr, target_addr);
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// Extract the target address from the value:
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m_run_to_sp.reset(new ThreadPlanRunToAddress(m_thread, target_so_addr, m_stop_others));
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m_thread.QueueThreadPlan(m_run_to_sp, false);
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m_run_to_sp->SetPrivate(true);
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return false;
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}
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else if (m_thread.IsThreadPlanDone(m_run_to_sp.get()))
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{
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// Third stage, work the run to target plan.
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SetPlanComplete();
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return true;
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}
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return false;
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}
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// The base class MischiefManaged does some cleanup - so you have to call it
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// in your MischiefManaged derived class.
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bool
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AppleThreadPlanStepThroughObjCTrampoline::MischiefManaged ()
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{
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if (IsPlanComplete())
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return true;
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else
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return false;
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}
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bool
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AppleThreadPlanStepThroughObjCTrampoline::WillStop()
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{
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return true;
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}
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