forked from OSchip/llvm-project
597 lines
20 KiB
C++
597 lines
20 KiB
C++
//===-- ClangFunction.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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#include "clang/AST/ASTContext.h"
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#include "clang/AST/RecordLayout.h"
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#include "clang/CodeGen/CodeGenAction.h"
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#include "clang/CodeGen/ModuleBuilder.h"
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#include "clang/Frontend/CompilerInstance.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/ExecutionEngine/ExecutionEngine.h"
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#include "llvm/IR/Module.h"
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// Project includes
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#include "lldb/Core/DataExtractor.h"
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#include "lldb/Core/Log.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/State.h"
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#include "lldb/Core/ValueObject.h"
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#include "lldb/Core/ValueObjectList.h"
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#include "lldb/Expression/ASTStructExtractor.h"
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#include "lldb/Expression/ClangExpressionParser.h"
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#include "lldb/Expression/ClangFunction.h"
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#include "lldb/Expression/IRExecutionUnit.h"
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#include "lldb/Interpreter/CommandReturnObject.h"
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#include "lldb/Symbol/ClangASTContext.h"
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#include "lldb/Symbol/Function.h"
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#include "lldb/Symbol/Type.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/RegisterContext.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/ThreadPlan.h"
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#include "lldb/Target/ThreadPlanCallFunction.h"
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using namespace lldb_private;
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//----------------------------------------------------------------------
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// ClangFunction constructor
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//----------------------------------------------------------------------
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ClangFunction::ClangFunction
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(
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ExecutionContextScope &exe_scope,
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const CompilerType &return_type,
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const Address& functionAddress,
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const ValueList &arg_value_list,
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const char *name
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) :
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m_execution_unit_sp(),
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m_parser(),
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m_jit_module_wp(),
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m_name (name ? name : "<unknown>"),
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m_function_ptr (NULL),
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m_function_addr (functionAddress),
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m_function_return_type(return_type),
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m_wrapper_function_name ("__lldb_caller_function"),
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m_wrapper_struct_name ("__lldb_caller_struct"),
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m_wrapper_args_addrs (),
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m_arg_values (arg_value_list),
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m_compiled (false),
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m_JITted (false)
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{
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m_jit_process_wp = lldb::ProcessWP(exe_scope.CalculateProcess());
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// Can't make a ClangFunction without a process.
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assert (m_jit_process_wp.lock());
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}
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ClangFunction::ClangFunction
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(
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ExecutionContextScope &exe_scope,
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Function &function,
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ClangASTContext *ast_context,
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const ValueList &arg_value_list,
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const char *name
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) :
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m_name (name ? name : "<unknown>"),
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m_function_ptr (&function),
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m_function_addr (),
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m_function_return_type (),
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m_wrapper_function_name ("__lldb_function_caller"),
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m_wrapper_struct_name ("__lldb_caller_struct"),
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m_wrapper_args_addrs (),
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m_arg_values (arg_value_list),
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m_compiled (false),
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m_JITted (false)
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{
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m_jit_process_wp = exe_scope.CalculateProcess();
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// Can't make a ClangFunction without a process.
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assert (m_jit_process_wp.lock());
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m_function_addr = m_function_ptr->GetAddressRange().GetBaseAddress();
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m_function_return_type = m_function_ptr->GetCompilerType().GetFunctionReturnType();
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}
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//----------------------------------------------------------------------
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// Destructor
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//----------------------------------------------------------------------
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ClangFunction::~ClangFunction()
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{
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lldb::ProcessSP process_sp (m_jit_process_wp.lock());
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if (process_sp)
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{
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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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unsigned
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ClangFunction::CompileFunction (Stream &errors)
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{
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if (m_compiled)
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return 0;
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// FIXME: How does clang tell us there's no return value? We need to handle that case.
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unsigned num_errors = 0;
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std::string return_type_str (m_function_return_type.GetTypeName().AsCString(""));
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// Cons up the function we're going to wrap our call in, then compile it...
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// We declare the function "extern "C"" because the compiler might be in C++
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// mode which would mangle the name and then we couldn't find it again...
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m_wrapper_function_text.clear();
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m_wrapper_function_text.append ("extern \"C\" void ");
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m_wrapper_function_text.append (m_wrapper_function_name);
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m_wrapper_function_text.append (" (void *input)\n{\n struct ");
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m_wrapper_function_text.append (m_wrapper_struct_name);
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m_wrapper_function_text.append (" \n {\n");
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m_wrapper_function_text.append (" ");
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m_wrapper_function_text.append (return_type_str);
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m_wrapper_function_text.append (" (*fn_ptr) (");
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// Get the number of arguments. If we have a function type and it is prototyped,
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// trust that, otherwise use the values we were given.
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// FIXME: This will need to be extended to handle Variadic functions. We'll need
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// to pull the defined arguments out of the function, then add the types from the
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// arguments list for the variable arguments.
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uint32_t num_args = UINT32_MAX;
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bool trust_function = false;
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// GetArgumentCount returns -1 for an unprototyped function.
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CompilerType function_clang_type;
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if (m_function_ptr)
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{
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function_clang_type = m_function_ptr->GetCompilerType();
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if (function_clang_type)
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{
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int num_func_args = function_clang_type.GetFunctionArgumentCount();
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if (num_func_args >= 0)
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{
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trust_function = true;
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num_args = num_func_args;
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}
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}
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}
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if (num_args == UINT32_MAX)
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num_args = m_arg_values.GetSize();
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std::string args_buffer; // This one stores the definition of all the args in "struct caller".
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std::string args_list_buffer; // This one stores the argument list called from the structure.
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for (size_t i = 0; i < num_args; i++)
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{
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std::string type_name;
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if (trust_function)
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{
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type_name = function_clang_type.GetFunctionArgumentTypeAtIndex(i).GetTypeName().AsCString("");
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}
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else
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{
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CompilerType clang_qual_type = m_arg_values.GetValueAtIndex(i)->GetCompilerType ();
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if (clang_qual_type)
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{
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type_name = clang_qual_type.GetTypeName().AsCString("");
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}
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else
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{
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errors.Printf("Could not determine type of input value %" PRIu64 ".", (uint64_t)i);
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return 1;
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}
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}
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m_wrapper_function_text.append (type_name);
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if (i < num_args - 1)
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m_wrapper_function_text.append (", ");
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char arg_buf[32];
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args_buffer.append (" ");
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args_buffer.append (type_name);
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snprintf(arg_buf, 31, "arg_%" PRIu64, (uint64_t)i);
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args_buffer.push_back (' ');
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args_buffer.append (arg_buf);
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args_buffer.append (";\n");
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args_list_buffer.append ("__lldb_fn_data->");
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args_list_buffer.append (arg_buf);
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if (i < num_args - 1)
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args_list_buffer.append (", ");
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}
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m_wrapper_function_text.append (");\n"); // Close off the function calling prototype.
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m_wrapper_function_text.append (args_buffer);
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m_wrapper_function_text.append (" ");
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m_wrapper_function_text.append (return_type_str);
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m_wrapper_function_text.append (" return_value;");
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m_wrapper_function_text.append ("\n };\n struct ");
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m_wrapper_function_text.append (m_wrapper_struct_name);
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m_wrapper_function_text.append ("* __lldb_fn_data = (struct ");
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m_wrapper_function_text.append (m_wrapper_struct_name);
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m_wrapper_function_text.append (" *) input;\n");
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m_wrapper_function_text.append (" __lldb_fn_data->return_value = __lldb_fn_data->fn_ptr (");
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m_wrapper_function_text.append (args_list_buffer);
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m_wrapper_function_text.append (");\n}\n");
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Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
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if (log)
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log->Printf ("Expression: \n\n%s\n\n", m_wrapper_function_text.c_str());
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// Okay, now compile this expression
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lldb::ProcessSP jit_process_sp(m_jit_process_wp.lock());
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if (jit_process_sp)
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{
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const bool generate_debug_info = true;
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m_parser.reset(new ClangExpressionParser(jit_process_sp.get(), *this, generate_debug_info));
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num_errors = m_parser->Parse (errors);
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}
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else
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{
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errors.Printf("no process - unable to inject function");
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num_errors = 1;
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}
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m_compiled = (num_errors == 0);
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if (!m_compiled)
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return num_errors;
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return num_errors;
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}
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bool
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ClangFunction::WriteFunctionWrapper (ExecutionContext &exe_ctx, Stream &errors)
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{
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Process *process = exe_ctx.GetProcessPtr();
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if (!process)
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return false;
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lldb::ProcessSP jit_process_sp(m_jit_process_wp.lock());
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if (process != jit_process_sp.get())
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return false;
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if (!m_compiled)
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return false;
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if (m_JITted)
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return true;
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bool can_interpret = false; // should stay that way
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Error jit_error (m_parser->PrepareForExecution (m_jit_start_addr,
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m_jit_end_addr,
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m_execution_unit_sp,
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exe_ctx,
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can_interpret,
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eExecutionPolicyAlways));
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if (!jit_error.Success())
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return false;
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if (m_parser->GetGenerateDebugInfo())
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{
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lldb::ModuleSP jit_module_sp ( m_execution_unit_sp->GetJITModule());
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if (jit_module_sp)
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{
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ConstString const_func_name(FunctionName());
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FileSpec jit_file;
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jit_file.GetFilename() = const_func_name;
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jit_module_sp->SetFileSpecAndObjectName (jit_file, ConstString());
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m_jit_module_wp = jit_module_sp;
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process->GetTarget().GetImages().Append(jit_module_sp);
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}
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}
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if (process && m_jit_start_addr)
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m_jit_process_wp = process->shared_from_this();
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m_JITted = true;
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return true;
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}
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bool
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ClangFunction::WriteFunctionArguments (ExecutionContext &exe_ctx, lldb::addr_t &args_addr_ref, Stream &errors)
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{
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return WriteFunctionArguments(exe_ctx, args_addr_ref, m_function_addr, m_arg_values, errors);
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}
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// FIXME: Assure that the ValueList we were passed in is consistent with the one that defined this function.
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bool
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ClangFunction::WriteFunctionArguments (ExecutionContext &exe_ctx,
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lldb::addr_t &args_addr_ref,
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Address function_address,
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ValueList &arg_values,
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Stream &errors)
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{
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// All the information to reconstruct the struct is provided by the
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// StructExtractor.
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if (!m_struct_valid)
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{
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errors.Printf("Argument information was not correctly parsed, so the function cannot be called.");
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return false;
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}
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Error error;
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using namespace clang;
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lldb::ExpressionResults return_value = lldb::eExpressionSetupError;
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Process *process = exe_ctx.GetProcessPtr();
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if (process == NULL)
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return return_value;
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lldb::ProcessSP jit_process_sp(m_jit_process_wp.lock());
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if (process != jit_process_sp.get())
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return false;
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if (args_addr_ref == LLDB_INVALID_ADDRESS)
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{
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args_addr_ref = process->AllocateMemory(m_struct_size, lldb::ePermissionsReadable|lldb::ePermissionsWritable, error);
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if (args_addr_ref == LLDB_INVALID_ADDRESS)
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return false;
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m_wrapper_args_addrs.push_back (args_addr_ref);
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}
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else
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{
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// Make sure this is an address that we've already handed out.
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if (find (m_wrapper_args_addrs.begin(), m_wrapper_args_addrs.end(), args_addr_ref) == m_wrapper_args_addrs.end())
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{
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return false;
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}
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}
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// TODO: verify fun_addr needs to be a callable address
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Scalar fun_addr (function_address.GetCallableLoadAddress(exe_ctx.GetTargetPtr()));
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uint64_t first_offset = m_member_offsets[0];
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process->WriteScalarToMemory(args_addr_ref + first_offset, fun_addr, process->GetAddressByteSize(), error);
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// FIXME: We will need to extend this for Variadic functions.
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Error value_error;
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size_t num_args = arg_values.GetSize();
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if (num_args != m_arg_values.GetSize())
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{
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errors.Printf ("Wrong number of arguments - was: %" PRIu64 " should be: %" PRIu64 "", (uint64_t)num_args, (uint64_t)m_arg_values.GetSize());
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return false;
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}
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for (size_t i = 0; i < num_args; i++)
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{
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// FIXME: We should sanity check sizes.
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uint64_t offset = m_member_offsets[i+1]; // Clang sizes are in bytes.
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Value *arg_value = arg_values.GetValueAtIndex(i);
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// FIXME: For now just do scalars:
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// Special case: if it's a pointer, don't do anything (the ABI supports passing cstrings)
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if (arg_value->GetValueType() == Value::eValueTypeHostAddress &&
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arg_value->GetContextType() == Value::eContextTypeInvalid &&
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arg_value->GetCompilerType().IsPointerType())
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continue;
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const Scalar &arg_scalar = arg_value->ResolveValue(&exe_ctx);
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if (!process->WriteScalarToMemory(args_addr_ref + offset, arg_scalar, arg_scalar.GetByteSize(), error))
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return false;
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}
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return true;
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}
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bool
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ClangFunction::InsertFunction (ExecutionContext &exe_ctx, lldb::addr_t &args_addr_ref, Stream &errors)
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{
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using namespace clang;
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if (CompileFunction(errors) != 0)
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return false;
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if (!WriteFunctionWrapper(exe_ctx, errors))
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return false;
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if (!WriteFunctionArguments(exe_ctx, args_addr_ref, errors))
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return false;
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Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
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if (log)
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log->Printf ("Call Address: 0x%" PRIx64 " Struct Address: 0x%" PRIx64 ".\n", m_jit_start_addr, args_addr_ref);
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return true;
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}
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lldb::ThreadPlanSP
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ClangFunction::GetThreadPlanToCallFunction (ExecutionContext &exe_ctx,
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lldb::addr_t args_addr,
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const EvaluateExpressionOptions &options,
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Stream &errors)
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{
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Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_EXPRESSIONS | LIBLLDB_LOG_STEP));
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if (log)
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log->Printf("-- [ClangFunction::GetThreadPlanToCallFunction] Creating thread plan to call function \"%s\" --", m_name.c_str());
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// FIXME: Use the errors Stream for better error reporting.
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Thread *thread = exe_ctx.GetThreadPtr();
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if (thread == NULL)
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{
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errors.Printf("Can't call a function without a valid thread.");
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return NULL;
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}
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// Okay, now run the function:
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Address wrapper_address (m_jit_start_addr);
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lldb::addr_t args = { args_addr };
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lldb::ThreadPlanSP new_plan_sp (new ThreadPlanCallFunction (*thread,
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wrapper_address,
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CompilerType(),
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args,
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options));
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new_plan_sp->SetIsMasterPlan(true);
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new_plan_sp->SetOkayToDiscard (false);
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return new_plan_sp;
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}
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bool
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ClangFunction::FetchFunctionResults (ExecutionContext &exe_ctx, lldb::addr_t args_addr, Value &ret_value)
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{
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// Read the return value - it is the last field in the struct:
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// FIXME: How does clang tell us there's no return value? We need to handle that case.
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// FIXME: Create our ThreadPlanCallFunction with the return CompilerType, and then use GetReturnValueObject
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// to fetch the value. That way we can fetch any values we need.
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Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_EXPRESSIONS | LIBLLDB_LOG_STEP));
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if (log)
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log->Printf("-- [ClangFunction::FetchFunctionResults] Fetching function results for \"%s\"--", m_name.c_str());
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Process *process = exe_ctx.GetProcessPtr();
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if (process == NULL)
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return false;
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lldb::ProcessSP jit_process_sp(m_jit_process_wp.lock());
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if (process != jit_process_sp.get())
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return false;
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Error error;
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ret_value.GetScalar() = process->ReadUnsignedIntegerFromMemory (args_addr + m_return_offset, m_return_size, 0, error);
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if (error.Fail())
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return false;
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ret_value.SetCompilerType(m_function_return_type);
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ret_value.SetValueType(Value::eValueTypeScalar);
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return true;
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}
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void
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ClangFunction::DeallocateFunctionResults (ExecutionContext &exe_ctx, lldb::addr_t args_addr)
|
|
{
|
|
std::list<lldb::addr_t>::iterator pos;
|
|
pos = std::find(m_wrapper_args_addrs.begin(), m_wrapper_args_addrs.end(), args_addr);
|
|
if (pos != m_wrapper_args_addrs.end())
|
|
m_wrapper_args_addrs.erase(pos);
|
|
|
|
exe_ctx.GetProcessRef().DeallocateMemory(args_addr);
|
|
}
|
|
|
|
lldb::ExpressionResults
|
|
ClangFunction::ExecuteFunction(
|
|
ExecutionContext &exe_ctx,
|
|
lldb::addr_t *args_addr_ptr,
|
|
const EvaluateExpressionOptions &options,
|
|
Stream &errors,
|
|
Value &results)
|
|
{
|
|
using namespace clang;
|
|
lldb::ExpressionResults return_value = lldb::eExpressionSetupError;
|
|
|
|
// ClangFunction::ExecuteFunction execution is always just to get the result. Do make sure we ignore
|
|
// breakpoints, unwind on error, and don't try to debug it.
|
|
EvaluateExpressionOptions real_options = options;
|
|
real_options.SetDebug(false);
|
|
real_options.SetUnwindOnError(true);
|
|
real_options.SetIgnoreBreakpoints(true);
|
|
|
|
lldb::addr_t args_addr;
|
|
|
|
if (args_addr_ptr != NULL)
|
|
args_addr = *args_addr_ptr;
|
|
else
|
|
args_addr = LLDB_INVALID_ADDRESS;
|
|
|
|
if (CompileFunction(errors) != 0)
|
|
return lldb::eExpressionSetupError;
|
|
|
|
if (args_addr == LLDB_INVALID_ADDRESS)
|
|
{
|
|
if (!InsertFunction(exe_ctx, args_addr, errors))
|
|
return lldb::eExpressionSetupError;
|
|
}
|
|
|
|
Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_EXPRESSIONS | LIBLLDB_LOG_STEP));
|
|
|
|
if (log)
|
|
log->Printf("== [ClangFunction::ExecuteFunction] Executing function \"%s\" ==", m_name.c_str());
|
|
|
|
lldb::ThreadPlanSP call_plan_sp = GetThreadPlanToCallFunction (exe_ctx,
|
|
args_addr,
|
|
real_options,
|
|
errors);
|
|
if (!call_plan_sp)
|
|
return lldb::eExpressionSetupError;
|
|
|
|
// We need to make sure we record the fact that we are running an expression here
|
|
// otherwise this fact will fail to be recorded when fetching an Objective-C object description
|
|
if (exe_ctx.GetProcessPtr())
|
|
exe_ctx.GetProcessPtr()->SetRunningUserExpression(true);
|
|
|
|
return_value = exe_ctx.GetProcessRef().RunThreadPlan (exe_ctx,
|
|
call_plan_sp,
|
|
real_options,
|
|
errors);
|
|
|
|
if (log)
|
|
{
|
|
if (return_value != lldb::eExpressionCompleted)
|
|
{
|
|
log->Printf("== [ClangFunction::ExecuteFunction] Execution of \"%s\" completed abnormally ==", m_name.c_str());
|
|
}
|
|
else
|
|
{
|
|
log->Printf("== [ClangFunction::ExecuteFunction] Execution of \"%s\" completed normally ==", m_name.c_str());
|
|
}
|
|
}
|
|
|
|
if (exe_ctx.GetProcessPtr())
|
|
exe_ctx.GetProcessPtr()->SetRunningUserExpression(false);
|
|
|
|
if (args_addr_ptr != NULL)
|
|
*args_addr_ptr = args_addr;
|
|
|
|
if (return_value != lldb::eExpressionCompleted)
|
|
return return_value;
|
|
|
|
FetchFunctionResults(exe_ctx, args_addr, results);
|
|
|
|
if (args_addr_ptr == NULL)
|
|
DeallocateFunctionResults(exe_ctx, args_addr);
|
|
|
|
return lldb::eExpressionCompleted;
|
|
}
|
|
|
|
clang::ASTConsumer *
|
|
ClangFunction::ASTTransformer (clang::ASTConsumer *passthrough)
|
|
{
|
|
m_struct_extractor.reset(new ASTStructExtractor(passthrough, m_wrapper_struct_name.c_str(), *this));
|
|
|
|
return m_struct_extractor.get();
|
|
}
|