1 //===-- UtilityFunction.cpp -----------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include <cstdio> 10 #include <sys/types.h> 11 12 #include "lldb/Core/Module.h" 13 #include "lldb/Expression/DiagnosticManager.h" 14 #include "lldb/Expression/FunctionCaller.h" 15 #include "lldb/Expression/IRExecutionUnit.h" 16 #include "lldb/Expression/UtilityFunction.h" 17 #include "lldb/Host/Host.h" 18 #include "lldb/Target/ExecutionContext.h" 19 #include "lldb/Target/Process.h" 20 #include "lldb/Target/Target.h" 21 #include "lldb/Utility/ConstString.h" 22 #include "lldb/Utility/Log.h" 23 #include "lldb/Utility/State.h" 24 #include "lldb/Utility/Stream.h" 25 26 using namespace lldb_private; 27 using namespace lldb; 28 29 char UtilityFunction::ID; 30 31 /// Constructor 32 /// 33 /// \param[in] text 34 /// The text of the function. Must be a full translation unit. 35 /// 36 /// \param[in] name 37 /// The name of the function, as used in the text. 38 UtilityFunction::UtilityFunction(ExecutionContextScope &exe_scope, 39 std::string text, std::string name, 40 bool enable_debugging) 41 : Expression(exe_scope), m_execution_unit_sp(), m_jit_module_wp(), 42 m_function_text(std::move(text)), m_function_name(std::move(name)) {} 43 44 UtilityFunction::~UtilityFunction() { 45 lldb::ProcessSP process_sp(m_jit_process_wp.lock()); 46 if (process_sp) { 47 lldb::ModuleSP jit_module_sp(m_jit_module_wp.lock()); 48 if (jit_module_sp) 49 process_sp->GetTarget().GetImages().Remove(jit_module_sp); 50 } 51 } 52 53 // FIXME: We should check that every time this is called it is called with the 54 // same return type & arguments... 55 56 FunctionCaller *UtilityFunction::MakeFunctionCaller( 57 const CompilerType &return_type, const ValueList &arg_value_list, 58 lldb::ThreadSP thread_to_use_sp, Status &error) { 59 if (m_caller_up) 60 return m_caller_up.get(); 61 62 ProcessSP process_sp = m_jit_process_wp.lock(); 63 if (!process_sp) { 64 error = Status::FromErrorString( 65 "Can't make a function caller without a process."); 66 return nullptr; 67 } 68 // Since we might need to allocate memory and maybe call code to make 69 // the caller, we need to be stopped. 70 if (process_sp->GetState() != lldb::eStateStopped) { 71 error = Status::FromErrorStringWithFormatv( 72 "Can't make a function caller while the process is {0}: the process " 73 "must be stopped to allocate memory.", 74 StateAsCString(process_sp->GetState())); 75 return nullptr; 76 } 77 78 Address impl_code_address; 79 impl_code_address.SetOffset(StartAddress()); 80 std::string name(m_function_name); 81 name.append("-caller"); 82 83 m_caller_up.reset(process_sp->GetTarget().GetFunctionCallerForLanguage( 84 Language().AsLanguageType(), return_type, impl_code_address, 85 arg_value_list, name.c_str(), error)); 86 if (error.Fail()) 87 return nullptr; 88 89 if (m_caller_up) { 90 DiagnosticManager diagnostics; 91 92 unsigned num_errors = 93 m_caller_up->CompileFunction(thread_to_use_sp, diagnostics); 94 if (num_errors) { 95 error = Status::FromError(diagnostics.GetAsError( 96 lldb::eExpressionParseError, 97 "Error compiling " + m_function_name + " caller function:")); 98 99 m_caller_up.reset(); 100 return nullptr; 101 } 102 103 diagnostics.Clear(); 104 ExecutionContext exe_ctx(process_sp); 105 106 if (!m_caller_up->WriteFunctionWrapper(exe_ctx, diagnostics)) { 107 error = Status::FromError(diagnostics.GetAsError( 108 lldb::eExpressionSetupError, 109 "Error inserting " + m_function_name + " caller function:")); 110 m_caller_up.reset(); 111 return nullptr; 112 } 113 } 114 return m_caller_up.get(); 115 } 116