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38dfb235db
LLDB uses utility functions to run code in the inferior for its own internal purposes, such as reading classes from the Objective-C runtime for example. Because these expressions should be transparent to the user, we ignore breakpoints and unwind the stack on errors, which makes them hard to debug. This patch adds a new setting target.debug-utility-expression that, when enabled, changes these options to facilitate debugging. It enables breakpoints, disables unwinding and writes out the utility function source code to disk so it shows up in the source view. Differential revision: https://reviews.llvm.org/D97249
111 lines
3.4 KiB
C++
111 lines
3.4 KiB
C++
//===-- UtilityFunction.cpp -----------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Host/Config.h"
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#include <stdio.h>
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#if HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include "lldb/Core/Module.h"
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#include "lldb/Core/StreamFile.h"
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#include "lldb/Expression/DiagnosticManager.h"
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#include "lldb/Expression/FunctionCaller.h"
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#include "lldb/Expression/IRExecutionUnit.h"
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#include "lldb/Expression/UtilityFunction.h"
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#include "lldb/Host/Host.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Utility/ConstString.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_private;
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using namespace lldb;
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char UtilityFunction::ID;
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/// Constructor
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///
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/// \param[in] text
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/// The text of the function. Must be a full translation unit.
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///
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/// \param[in] name
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/// The name of the function, as used in the text.
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UtilityFunction::UtilityFunction(ExecutionContextScope &exe_scope,
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std::string text, std::string name,
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bool enable_debugging)
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: Expression(exe_scope), m_execution_unit_sp(), m_jit_module_wp(),
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m_function_text(std::move(text)), m_function_name(std::move(name)) {}
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UtilityFunction::~UtilityFunction() {
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lldb::ProcessSP process_sp(m_jit_process_wp.lock());
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if (process_sp) {
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lldb::ModuleSP jit_module_sp(m_jit_module_wp.lock());
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if (jit_module_sp)
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process_sp->GetTarget().GetImages().Remove(jit_module_sp);
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}
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}
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// FIXME: We should check that every time this is called it is called with the
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// same return type & arguments...
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FunctionCaller *UtilityFunction::MakeFunctionCaller(
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const CompilerType &return_type, const ValueList &arg_value_list,
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lldb::ThreadSP thread_to_use_sp, Status &error) {
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if (m_caller_up)
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return m_caller_up.get();
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ProcessSP process_sp = m_jit_process_wp.lock();
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if (!process_sp) {
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error.SetErrorString("Can't make a function caller without a process.");
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return nullptr;
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}
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Address impl_code_address;
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impl_code_address.SetOffset(StartAddress());
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std::string name(m_function_name);
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name.append("-caller");
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m_caller_up.reset(process_sp->GetTarget().GetFunctionCallerForLanguage(
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Language(), return_type, impl_code_address, arg_value_list, name.c_str(),
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error));
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if (error.Fail()) {
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return nullptr;
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}
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if (m_caller_up) {
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DiagnosticManager diagnostics;
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unsigned num_errors =
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m_caller_up->CompileFunction(thread_to_use_sp, diagnostics);
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if (num_errors) {
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error.SetErrorStringWithFormat(
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"Error compiling %s caller function: \"%s\".",
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m_function_name.c_str(), diagnostics.GetString().c_str());
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m_caller_up.reset();
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return nullptr;
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}
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diagnostics.Clear();
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ExecutionContext exe_ctx(process_sp);
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if (!m_caller_up->WriteFunctionWrapper(exe_ctx, diagnostics)) {
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error.SetErrorStringWithFormat(
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"Error inserting caller function for %s: \"%s\".",
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m_function_name.c_str(), diagnostics.GetString().c_str());
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m_caller_up.reset();
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return nullptr;
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}
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}
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return m_caller_up.get();
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}
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