1 //===-- ClangFunctionCaller.cpp ---------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "ClangFunctionCaller.h"
12 #include "ASTStructExtractor.h"
13 #include "ClangExpressionParser.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/RecordLayout.h"
17 #include "clang/CodeGen/CodeGenAction.h"
18 #include "clang/CodeGen/ModuleBuilder.h"
19 #include "clang/Frontend/CompilerInstance.h"
20 #include "llvm/ADT/StringRef.h"
21 #include "llvm/ADT/Triple.h"
22 #include "llvm/ExecutionEngine/ExecutionEngine.h"
23 #include "llvm/IR/Module.h"
25 #include "lldb/Core/Module.h"
26 #include "lldb/Core/ValueObject.h"
27 #include "lldb/Core/ValueObjectList.h"
28 #include "lldb/Expression/IRExecutionUnit.h"
29 #include "lldb/Interpreter/CommandReturnObject.h"
30 #include "lldb/Symbol/ClangASTContext.h"
31 #include "lldb/Symbol/Function.h"
32 #include "lldb/Symbol/Type.h"
33 #include "lldb/Target/ExecutionContext.h"
34 #include "lldb/Target/Process.h"
35 #include "lldb/Target/RegisterContext.h"
36 #include "lldb/Target/Target.h"
37 #include "lldb/Target/Thread.h"
38 #include "lldb/Target/ThreadPlan.h"
39 #include "lldb/Target/ThreadPlanCallFunction.h"
40 #include "lldb/Utility/DataExtractor.h"
41 #include "lldb/Utility/Log.h"
42 #include "lldb/Utility/State.h"
44 using namespace lldb_private;
46 //----------------------------------------------------------------------
47 // ClangFunctionCaller constructor
48 //----------------------------------------------------------------------
49 ClangFunctionCaller::ClangFunctionCaller(ExecutionContextScope &exe_scope,
50 const CompilerType &return_type,
51 const Address &functionAddress,
52 const ValueList &arg_value_list,
54 : FunctionCaller(exe_scope, return_type, functionAddress, arg_value_list,
56 m_type_system_helper(*this) {
57 m_jit_process_wp = lldb::ProcessWP(exe_scope.CalculateProcess());
58 // Can't make a ClangFunctionCaller without a process.
59 assert(m_jit_process_wp.lock());
62 //----------------------------------------------------------------------
64 //----------------------------------------------------------------------
65 ClangFunctionCaller::~ClangFunctionCaller() {}
69 ClangFunctionCaller::CompileFunction(lldb::ThreadSP thread_to_use_sp,
70 DiagnosticManager &diagnostic_manager) {
74 // Compilation might call code, make sure to keep on the thread the caller
76 ThreadList::ExpressionExecutionThreadPusher execution_thread_pusher(
79 // FIXME: How does clang tell us there's no return value? We need to handle
81 unsigned num_errors = 0;
83 std::string return_type_str(
84 m_function_return_type.GetTypeName().AsCString(""));
86 // Cons up the function we're going to wrap our call in, then compile it...
87 // We declare the function "extern "C"" because the compiler might be in C++
88 // mode which would mangle the name and then we couldn't find it again...
89 m_wrapper_function_text.clear();
90 m_wrapper_function_text.append("extern \"C\" void ");
91 m_wrapper_function_text.append(m_wrapper_function_name);
92 m_wrapper_function_text.append(" (void *input)\n{\n struct ");
93 m_wrapper_function_text.append(m_wrapper_struct_name);
94 m_wrapper_function_text.append(" \n {\n");
95 m_wrapper_function_text.append(" ");
96 m_wrapper_function_text.append(return_type_str);
97 m_wrapper_function_text.append(" (*fn_ptr) (");
99 // Get the number of arguments. If we have a function type and it is
100 // prototyped, trust that, otherwise use the values we were given.
102 // FIXME: This will need to be extended to handle Variadic functions. We'll
104 // to pull the defined arguments out of the function, then add the types from
105 // the arguments list for the variable arguments.
107 uint32_t num_args = UINT32_MAX;
108 bool trust_function = false;
109 // GetArgumentCount returns -1 for an unprototyped function.
110 CompilerType function_clang_type;
111 if (m_function_ptr) {
112 function_clang_type = m_function_ptr->GetCompilerType();
113 if (function_clang_type) {
114 int num_func_args = function_clang_type.GetFunctionArgumentCount();
115 if (num_func_args >= 0) {
116 trust_function = true;
117 num_args = num_func_args;
122 if (num_args == UINT32_MAX)
123 num_args = m_arg_values.GetSize();
125 std::string args_buffer; // This one stores the definition of all the args in
127 std::string args_list_buffer; // This one stores the argument list called from
129 for (size_t i = 0; i < num_args; i++) {
130 std::string type_name;
132 if (trust_function) {
133 type_name = function_clang_type.GetFunctionArgumentTypeAtIndex(i)
137 CompilerType clang_qual_type =
138 m_arg_values.GetValueAtIndex(i)->GetCompilerType();
139 if (clang_qual_type) {
140 type_name = clang_qual_type.GetTypeName().AsCString("");
142 diagnostic_manager.Printf(
143 eDiagnosticSeverityError,
144 "Could not determine type of input value %" PRIu64 ".",
150 m_wrapper_function_text.append(type_name);
151 if (i < num_args - 1)
152 m_wrapper_function_text.append(", ");
155 args_buffer.append(" ");
156 args_buffer.append(type_name);
157 snprintf(arg_buf, 31, "arg_%" PRIu64, (uint64_t)i);
158 args_buffer.push_back(' ');
159 args_buffer.append(arg_buf);
160 args_buffer.append(";\n");
162 args_list_buffer.append("__lldb_fn_data->");
163 args_list_buffer.append(arg_buf);
164 if (i < num_args - 1)
165 args_list_buffer.append(", ");
167 m_wrapper_function_text.append(
168 ");\n"); // Close off the function calling prototype.
170 m_wrapper_function_text.append(args_buffer);
172 m_wrapper_function_text.append(" ");
173 m_wrapper_function_text.append(return_type_str);
174 m_wrapper_function_text.append(" return_value;");
175 m_wrapper_function_text.append("\n };\n struct ");
176 m_wrapper_function_text.append(m_wrapper_struct_name);
177 m_wrapper_function_text.append("* __lldb_fn_data = (struct ");
178 m_wrapper_function_text.append(m_wrapper_struct_name);
179 m_wrapper_function_text.append(" *) input;\n");
181 m_wrapper_function_text.append(
182 " __lldb_fn_data->return_value = __lldb_fn_data->fn_ptr (");
183 m_wrapper_function_text.append(args_list_buffer);
184 m_wrapper_function_text.append(");\n}\n");
186 Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
188 log->Printf("Expression: \n\n%s\n\n", m_wrapper_function_text.c_str());
190 // Okay, now compile this expression
192 lldb::ProcessSP jit_process_sp(m_jit_process_wp.lock());
193 if (jit_process_sp) {
194 const bool generate_debug_info = true;
195 m_parser.reset(new ClangExpressionParser(jit_process_sp.get(), *this,
196 generate_debug_info));
198 num_errors = m_parser->Parse(diagnostic_manager);
200 diagnostic_manager.PutString(eDiagnosticSeverityError,
201 "no process - unable to inject function");
205 m_compiled = (num_errors == 0);
214 ClangFunctionCaller::ClangFunctionCallerHelper::ASTTransformer(
215 clang::ASTConsumer *passthrough) {
216 m_struct_extractor.reset(new ASTStructExtractor(
217 passthrough, m_owner.GetWrapperStructName(), m_owner));
219 return m_struct_extractor.get();