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These methods can be used by the derived expression types to perform expression specific and/or language specific actions before and after the expression runs. (ThreadPlanCallUserExpression is modified to call these methods on the expression immediately before/after execution of the expression). The immediate motivation is allowing Swift expressions to notify the swift runtime that exclusivity enforcement should be suspended while the expression runs (we want LLDB expressions to be able to access variables even when they're considered exclusively owned by someone else in the original program). Reviewed in https://reviews.llvm.org/D32889 llvm-svn: 302314
127 lines
4.0 KiB
C++
127 lines
4.0 KiB
C++
//===-- ThreadPlanCallUserExpression.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/ThreadPlanCallUserExpression.h"
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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 "lldb/Breakpoint/Breakpoint.h"
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#include "lldb/Breakpoint/BreakpointLocation.h"
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#include "lldb/Core/Address.h"
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#include "lldb/Expression/DiagnosticManager.h"
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#include "lldb/Expression/IRDynamicChecks.h"
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#include "lldb/Expression/UserExpression.h"
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#include "lldb/Host/HostInfo.h"
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#include "lldb/Target/LanguageRuntime.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/RegisterContext.h"
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#include "lldb/Target/StopInfo.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/ThreadPlanRunToAddress.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/Stream.h"
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using namespace lldb;
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using namespace lldb_private;
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//----------------------------------------------------------------------
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// ThreadPlanCallUserExpression: Plan to call a single function
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//----------------------------------------------------------------------
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ThreadPlanCallUserExpression::ThreadPlanCallUserExpression(
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Thread &thread, Address &function, llvm::ArrayRef<lldb::addr_t> args,
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const EvaluateExpressionOptions &options,
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lldb::UserExpressionSP &user_expression_sp)
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: ThreadPlanCallFunction(thread, function, CompilerType(), args, options),
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m_user_expression_sp(user_expression_sp) {
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// User expressions are generally "User generated" so we should set them up to
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// stop when done.
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SetIsMasterPlan(true);
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SetOkayToDiscard(false);
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}
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ThreadPlanCallUserExpression::~ThreadPlanCallUserExpression() {}
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void ThreadPlanCallUserExpression::GetDescription(
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Stream *s, lldb::DescriptionLevel level) {
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if (level == eDescriptionLevelBrief)
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s->Printf("User Expression thread plan");
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else
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ThreadPlanCallFunction::GetDescription(s, level);
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}
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void ThreadPlanCallUserExpression::DidPush() {
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ThreadPlanCallFunction::DidPush();
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if (m_user_expression_sp)
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m_user_expression_sp->WillStartExecuting();
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}
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void ThreadPlanCallUserExpression::WillPop() {
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ThreadPlanCallFunction::WillPop();
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if (m_user_expression_sp)
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m_user_expression_sp.reset();
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}
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bool ThreadPlanCallUserExpression::MischiefManaged() {
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Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
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if (IsPlanComplete()) {
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if (log)
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log->Printf("ThreadPlanCallFunction(%p): Completed call function plan.",
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static_cast<void *>(this));
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if (m_manage_materialization && PlanSucceeded() && m_user_expression_sp) {
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lldb::addr_t function_stack_top;
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lldb::addr_t function_stack_bottom;
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lldb::addr_t function_stack_pointer = GetFunctionStackPointer();
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function_stack_bottom = function_stack_pointer - HostInfo::GetPageSize();
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function_stack_top = function_stack_pointer;
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DiagnosticManager diagnostics;
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ExecutionContext exe_ctx(GetThread());
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m_user_expression_sp->FinalizeJITExecution(
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diagnostics, exe_ctx, m_result_var_sp, function_stack_bottom,
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function_stack_top);
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}
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ThreadPlan::MischiefManaged();
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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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}
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StopInfoSP ThreadPlanCallUserExpression::GetRealStopInfo() {
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StopInfoSP stop_info_sp = ThreadPlanCallFunction::GetRealStopInfo();
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if (stop_info_sp) {
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lldb::addr_t addr = GetStopAddress();
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DynamicCheckerFunctions *checkers =
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m_thread.GetProcess()->GetDynamicCheckers();
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StreamString s;
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if (checkers && checkers->DoCheckersExplainStop(addr, s))
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stop_info_sp->SetDescription(s.GetData());
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}
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return stop_info_sp;
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}
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void ThreadPlanCallUserExpression::DoTakedown(bool success) {
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ThreadPlanCallFunction::DoTakedown(success);
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m_user_expression_sp->DidFinishExecuting();
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}
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