1 files changed, 657 insertions, 0 deletions

diff --git a/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp b/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp
new file mode 100644
index 0000000000000..72c33fec8105c
--- /dev/null
+++ b/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp
@@ -0,0 +1,657 @@
+//===-- ClangExpressionParser.cpp -------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// C Includes
+// C++ Includes
+// Other libraries and framework includes
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/ExternalASTSource.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/TargetInfo.h"
+#include "clang/Basic/Version.h"
+#include "clang/CodeGen/CodeGenAction.h"
+#include "clang/CodeGen/ModuleBuilder.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/CompilerInvocation.h"
+#include "clang/Frontend/FrontendActions.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Frontend/FrontendPluginRegistry.h"
+#include "clang/Frontend/TextDiagnosticBuffer.h"
+#include "clang/Frontend/TextDiagnosticPrinter.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Parse/ParseAST.h"
+#include "clang/Rewrite/Frontend/FrontendActions.h"
+#include "clang/Sema/SemaConsumer.h"
+#include "clang/StaticAnalyzer/Frontend/FrontendActions.h"
+
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ExecutionEngine/ExecutionEngine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/TargetSelect.h"
+
+#include "llvm/ExecutionEngine/MCJIT.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/DynamicLibrary.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/Signals.h"
+
+// Project includes
+#include "ClangExpressionParser.h"
+
+#include "ClangASTSource.h"
+#include "ClangExpressionHelper.h"
+#include "ClangExpressionDeclMap.h"
+#include "ClangModulesDeclVendor.h"
+#include "ClangPersistentVariables.h"
+#include "IRForTarget.h"
+
+#include "lldb/Core/ArchSpec.h"
+#include "lldb/Core/DataBufferHeap.h"
+#include "lldb/Core/Debugger.h"
+#include "lldb/Core/Disassembler.h"
+#include "lldb/Core/Log.h"
+#include "lldb/Core/Module.h"
+#include "lldb/Core/Stream.h"
+#include "lldb/Core/StreamFile.h"
+#include "lldb/Core/StreamString.h"
+#include "lldb/Expression/IRExecutionUnit.h"
+#include "lldb/Expression/IRDynamicChecks.h"
+#include "lldb/Expression/IRInterpreter.h"
+#include "lldb/Host/File.h"
+#include "lldb/Host/HostInfo.h"
+#include "lldb/Symbol/ClangASTContext.h"
+#include "lldb/Symbol/SymbolVendor.h"
+#include "lldb/Target/ExecutionContext.h"
+#include "lldb/Target/ObjCLanguageRuntime.h"
+#include "lldb/Target/Process.h"
+#include "lldb/Target/Target.h"
+
+using namespace clang;
+using namespace llvm;
+using namespace lldb_private;
+
+//===----------------------------------------------------------------------===//
+// Utility Methods for Clang
+//===----------------------------------------------------------------------===//
+
+std::string GetBuiltinIncludePath(const char *Argv0) {
+    SmallString<128> P(llvm::sys::fs::getMainExecutable(
+        Argv0, (void *)(intptr_t) GetBuiltinIncludePath));
+
+    if (!P.empty()) {
+        llvm::sys::path::remove_filename(P); // Remove /clang from foo/bin/clang
+        llvm::sys::path::remove_filename(P); // Remove /bin   from foo/bin
+
+        // Get foo/lib/clang/<version>/include
+        llvm::sys::path::append(P, "lib", "clang", CLANG_VERSION_STRING,
+                                "include");
+    }
+
+    return P.str();
+}
+
+class ClangExpressionParser::LLDBPreprocessorCallbacks : public PPCallbacks
+{
+    ClangModulesDeclVendor     &m_decl_vendor;
+    ClangPersistentVariables   &m_persistent_vars;
+    StreamString                m_error_stream;
+    bool                        m_has_errors = false;
+
+public:
+    LLDBPreprocessorCallbacks(ClangModulesDeclVendor &decl_vendor,
+                              ClangPersistentVariables &persistent_vars) :
+        m_decl_vendor(decl_vendor),
+        m_persistent_vars(persistent_vars)
+    {
+    }
+    
+    void
+    moduleImport(SourceLocation import_location,
+                 clang::ModuleIdPath path,
+                 const clang::Module * /*null*/) override
+    {
+        std::vector<ConstString> string_path;
+        
+        for (const std::pair<IdentifierInfo *, SourceLocation> &component : path)
+        {
+            string_path.push_back(ConstString(component.first->getName()));
+        }
+     
+        StreamString error_stream;
+        
+        ClangModulesDeclVendor::ModuleVector exported_modules;
+        
+        if (!m_decl_vendor.AddModule(string_path, &exported_modules, m_error_stream))
+        {
+            m_has_errors = true;
+        }
+        
+        for (ClangModulesDeclVendor::ModuleID module : exported_modules)
+        {
+            m_persistent_vars.AddHandLoadedClangModule(module);
+        }
+    }
+    
+    bool hasErrors()
+    {
+        return m_has_errors;
+    }
+    
+    const std::string &getErrorString()
+    {
+        return m_error_stream.GetString();
+    }
+};
+
+//===----------------------------------------------------------------------===//
+// Implementation of ClangExpressionParser
+//===----------------------------------------------------------------------===//
+
+ClangExpressionParser::ClangExpressionParser (ExecutionContextScope *exe_scope,
+                                              Expression &expr,
+                                              bool generate_debug_info) :
+    ExpressionParser (exe_scope, expr, generate_debug_info),
+    m_compiler (),
+    m_code_generator (),
+    m_pp_callbacks(nullptr)
+{
+    // 1. Create a new compiler instance.
+    m_compiler.reset(new CompilerInstance());
+
+    // 2. Install the target.
+
+    lldb::TargetSP target_sp;
+    if (exe_scope)
+        target_sp = exe_scope->CalculateTarget();
+
+    // TODO: figure out what to really do when we don't have a valid target.
+    // Sometimes this will be ok to just use the host target triple (when we
+    // evaluate say "2+3", but other expressions like breakpoint conditions
+    // and other things that _are_ target specific really shouldn't just be
+    // using the host triple. This needs to be fixed in a better way.
+    if (target_sp && target_sp->GetArchitecture().IsValid())
+    {
+        std::string triple = target_sp->GetArchitecture().GetTriple().str();
+        m_compiler->getTargetOpts().Triple = triple;
+    }
+    else
+    {
+        m_compiler->getTargetOpts().Triple = llvm::sys::getDefaultTargetTriple();
+    }
+
+    if (target_sp->GetArchitecture().GetMachine() == llvm::Triple::x86 ||
+        target_sp->GetArchitecture().GetMachine() == llvm::Triple::x86_64)
+    {
+        m_compiler->getTargetOpts().Features.push_back("+sse");
+        m_compiler->getTargetOpts().Features.push_back("+sse2");
+    }
+
+    // Any arm32 iOS environment, but not on arm64
+    if (m_compiler->getTargetOpts().Triple.find("arm64") == std::string::npos &&
+        m_compiler->getTargetOpts().Triple.find("arm") != std::string::npos &&
+        m_compiler->getTargetOpts().Triple.find("ios") != std::string::npos)
+    {
+        m_compiler->getTargetOpts().ABI = "apcs-gnu";
+    }
+
+    m_compiler->createDiagnostics();
+
+    // Create the target instance.
+    m_compiler->setTarget(TargetInfo::CreateTargetInfo(
+        m_compiler->getDiagnostics(), m_compiler->getInvocation().TargetOpts));
+
+    assert (m_compiler->hasTarget());
+
+    // 3. Set options.
+
+    lldb::LanguageType language = expr.Language();
+
+    switch (language)
+    {
+    case lldb::eLanguageTypeC:
+    case lldb::eLanguageTypeC89:
+    case lldb::eLanguageTypeC99:
+    case lldb::eLanguageTypeC11:
+        // FIXME: the following language option is a temporary workaround,
+        // to "ask for C, get C++."
+        // For now, the expression parser must use C++ anytime the
+        // language is a C family language, because the expression parser
+        // uses features of C++ to capture values.
+        m_compiler->getLangOpts().CPlusPlus = true;
+        break;
+    case lldb::eLanguageTypeObjC:
+        m_compiler->getLangOpts().ObjC1 = true;
+        m_compiler->getLangOpts().ObjC2 = true;
+        // FIXME: the following language option is a temporary workaround,
+        // to "ask for ObjC, get ObjC++" (see comment above).
+        m_compiler->getLangOpts().CPlusPlus = true;
+        break;
+    case lldb::eLanguageTypeC_plus_plus:
+    case lldb::eLanguageTypeC_plus_plus_11:
+    case lldb::eLanguageTypeC_plus_plus_14:
+        m_compiler->getLangOpts().CPlusPlus11 = true;
+        m_compiler->getHeaderSearchOpts().UseLibcxx = true;
+        // fall thru ...
+    case lldb::eLanguageTypeC_plus_plus_03:
+        m_compiler->getLangOpts().CPlusPlus = true;
+        // FIXME: the following language option is a temporary workaround,
+        // to "ask for C++, get ObjC++".  Apple hopes to remove this requirement
+        // on non-Apple platforms, but for now it is needed.
+        m_compiler->getLangOpts().ObjC1 = true;
+        break;
+    case lldb::eLanguageTypeObjC_plus_plus:
+    case lldb::eLanguageTypeUnknown:
+    default:
+        m_compiler->getLangOpts().ObjC1 = true;
+        m_compiler->getLangOpts().ObjC2 = true;
+        m_compiler->getLangOpts().CPlusPlus = true;
+        m_compiler->getLangOpts().CPlusPlus11 = true;
+        m_compiler->getHeaderSearchOpts().UseLibcxx = true;
+        break;
+    }
+
+    m_compiler->getLangOpts().Bool = true;
+    m_compiler->getLangOpts().WChar = true;
+    m_compiler->getLangOpts().Blocks = true;
+    m_compiler->getLangOpts().DebuggerSupport = true; // Features specifically for debugger clients
+    if (expr.DesiredResultType() == Expression::eResultTypeId)
+        m_compiler->getLangOpts().DebuggerCastResultToId = true;
+
+    m_compiler->getLangOpts().CharIsSigned =
+            ArchSpec(m_compiler->getTargetOpts().Triple.c_str()).CharIsSignedByDefault();
+
+    // Spell checking is a nice feature, but it ends up completing a
+    // lot of types that we didn't strictly speaking need to complete.
+    // As a result, we spend a long time parsing and importing debug
+    // information.
+    m_compiler->getLangOpts().SpellChecking = false;
+
+    lldb::ProcessSP process_sp;
+    if (exe_scope)
+        process_sp = exe_scope->CalculateProcess();
+
+    if (process_sp && m_compiler->getLangOpts().ObjC1)
+    {
+        if (process_sp->GetObjCLanguageRuntime())
+        {
+            if (process_sp->GetObjCLanguageRuntime()->GetRuntimeVersion() == ObjCLanguageRuntime::ObjCRuntimeVersions::eAppleObjC_V2)
+                m_compiler->getLangOpts().ObjCRuntime.set(ObjCRuntime::MacOSX, VersionTuple(10, 7));
+            else
+                m_compiler->getLangOpts().ObjCRuntime.set(ObjCRuntime::FragileMacOSX, VersionTuple(10, 7));
+
+            if (process_sp->GetObjCLanguageRuntime()->HasNewLiteralsAndIndexing())
+                m_compiler->getLangOpts().DebuggerObjCLiteral = true;
+        }
+    }
+
+    m_compiler->getLangOpts().ThreadsafeStatics = false;
+    m_compiler->getLangOpts().AccessControl = false; // Debuggers get universal access
+    m_compiler->getLangOpts().DollarIdents = true; // $ indicates a persistent variable name
+
+    // Set CodeGen options
+    m_compiler->getCodeGenOpts().EmitDeclMetadata = true;
+    m_compiler->getCodeGenOpts().InstrumentFunctions = false;
+    m_compiler->getCodeGenOpts().DisableFPElim = true;
+    m_compiler->getCodeGenOpts().OmitLeafFramePointer = false;
+    if (generate_debug_info)
+        m_compiler->getCodeGenOpts().setDebugInfo(CodeGenOptions::FullDebugInfo);
+    else
+        m_compiler->getCodeGenOpts().setDebugInfo(CodeGenOptions::NoDebugInfo);
+
+    // Disable some warnings.
+    m_compiler->getDiagnostics().setSeverityForGroup(clang::diag::Flavor::WarningOrError,
+        "unused-value", clang::diag::Severity::Ignored, SourceLocation());
+    m_compiler->getDiagnostics().setSeverityForGroup(clang::diag::Flavor::WarningOrError,
+        "odr", clang::diag::Severity::Ignored, SourceLocation());
+
+    // Inform the target of the language options
+    //
+    // FIXME: We shouldn't need to do this, the target should be immutable once
+    // created. This complexity should be lifted elsewhere.
+    m_compiler->getTarget().adjust(m_compiler->getLangOpts());
+
+    // 4. Set up the diagnostic buffer for reporting errors
+
+    m_compiler->getDiagnostics().setClient(new clang::TextDiagnosticBuffer);
+
+    // 5. Set up the source management objects inside the compiler
+
+    clang::FileSystemOptions file_system_options;
+    m_file_manager.reset(new clang::FileManager(file_system_options));
+
+    if (!m_compiler->hasSourceManager())
+        m_compiler->createSourceManager(*m_file_manager.get());
+
+    m_compiler->createFileManager();
+    m_compiler->createPreprocessor(TU_Complete);
+    
+    if (ClangModulesDeclVendor *decl_vendor = target_sp->GetClangModulesDeclVendor())
+    {
+        ClangPersistentVariables *clang_persistent_vars = llvm::cast<ClangPersistentVariables>(target_sp->GetPersistentExpressionStateForLanguage(lldb::eLanguageTypeC));
+        std::unique_ptr<PPCallbacks> pp_callbacks(new LLDBPreprocessorCallbacks(*decl_vendor, *clang_persistent_vars));
+        m_pp_callbacks = static_cast<LLDBPreprocessorCallbacks*>(pp_callbacks.get());
+        m_compiler->getPreprocessor().addPPCallbacks(std::move(pp_callbacks));
+    }
+        
+    // 6. Most of this we get from the CompilerInstance, but we
+    // also want to give the context an ExternalASTSource.
+    m_selector_table.reset(new SelectorTable());
+    m_builtin_context.reset(new Builtin::Context());
+
+    std::unique_ptr<clang::ASTContext> ast_context(new ASTContext(m_compiler->getLangOpts(),
+                                                                  m_compiler->getSourceManager(),
+                                                                  m_compiler->getPreprocessor().getIdentifierTable(),
+                                                                  *m_selector_table.get(),
+                                                                  *m_builtin_context.get()));
+    
+    ast_context->InitBuiltinTypes(m_compiler->getTarget());
+
+    ClangExpressionHelper *type_system_helper = dyn_cast<ClangExpressionHelper>(m_expr.GetTypeSystemHelper());
+    ClangExpressionDeclMap *decl_map = type_system_helper->DeclMap();
+
+    if (decl_map)
+    {
+        llvm::IntrusiveRefCntPtr<clang::ExternalASTSource> ast_source(decl_map->CreateProxy());
+        decl_map->InstallASTContext(ast_context.get());
+        ast_context->setExternalSource(ast_source);
+    }
+
+    m_ast_context.reset(new ClangASTContext(m_compiler->getTargetOpts().Triple.c_str()));
+    m_ast_context->setASTContext(ast_context.get());
+    m_compiler->setASTContext(ast_context.release());
+
+    std::string module_name("$__lldb_module");
+
+    m_llvm_context.reset(new LLVMContext());
+    m_code_generator.reset(CreateLLVMCodeGen(m_compiler->getDiagnostics(),
+                                             module_name,
+                                             m_compiler->getHeaderSearchOpts(),
+                                             m_compiler->getPreprocessorOpts(),
+                                             m_compiler->getCodeGenOpts(),
+                                             *m_llvm_context));
+}
+
+ClangExpressionParser::~ClangExpressionParser()
+{
+}
+
+unsigned
+ClangExpressionParser::Parse (Stream &stream)
+{
+    TextDiagnosticBuffer *diag_buf = static_cast<TextDiagnosticBuffer*>(m_compiler->getDiagnostics().getClient());
+
+    diag_buf->FlushDiagnostics (m_compiler->getDiagnostics());
+
+    const char *expr_text = m_expr.Text();
+
+    clang::SourceManager &SourceMgr = m_compiler->getSourceManager();
+    bool created_main_file = false;
+    if (m_compiler->getCodeGenOpts().getDebugInfo() == CodeGenOptions::FullDebugInfo)
+    {
+        std::string temp_source_path;
+
+        int temp_fd = -1;
+        llvm::SmallString<PATH_MAX> result_path;
+        FileSpec tmpdir_file_spec;
+        if (HostInfo::GetLLDBPath(lldb::ePathTypeLLDBTempSystemDir, tmpdir_file_spec))
+        {
+            tmpdir_file_spec.AppendPathComponent("lldb-%%%%%%.expr");
+            temp_source_path = tmpdir_file_spec.GetPath();
+            llvm::sys::fs::createUniqueFile(temp_source_path, temp_fd, result_path);
+        }
+        else
+        {
+            llvm::sys::fs::createTemporaryFile("lldb", "expr", temp_fd, result_path);
+        }
+        
+        if (temp_fd != -1)
+        {
+            lldb_private::File file (temp_fd, true);
+            const size_t expr_text_len = strlen(expr_text);
+            size_t bytes_written = expr_text_len;
+            if (file.Write(expr_text, bytes_written).Success())
+            {
+                if (bytes_written == expr_text_len)
+                {
+                    file.Close();
+                    SourceMgr.setMainFileID(SourceMgr.createFileID(
+                        m_file_manager->getFile(result_path),
+                        SourceLocation(), SrcMgr::C_User));
+                    created_main_file = true;
+                }
+            }
+        }
+    }
+
+    if (!created_main_file)
+    {
+        std::unique_ptr<MemoryBuffer> memory_buffer = MemoryBuffer::getMemBufferCopy(expr_text, __FUNCTION__);
+        SourceMgr.setMainFileID(SourceMgr.createFileID(std::move(memory_buffer)));
+    }
+
+    diag_buf->BeginSourceFile(m_compiler->getLangOpts(), &m_compiler->getPreprocessor());
+
+    ClangExpressionHelper *type_system_helper = dyn_cast<ClangExpressionHelper>(m_expr.GetTypeSystemHelper());
+
+    ASTConsumer *ast_transformer = type_system_helper->ASTTransformer(m_code_generator.get());
+
+    if (ClangExpressionDeclMap *decl_map = type_system_helper->DeclMap())
+        decl_map->InstallCodeGenerator(m_code_generator.get());
+
+    if (ast_transformer)
+    {
+        ast_transformer->Initialize(m_compiler->getASTContext());
+        ParseAST(m_compiler->getPreprocessor(), ast_transformer, m_compiler->getASTContext());
+    }
+    else
+    {
+        m_code_generator->Initialize(m_compiler->getASTContext());
+        ParseAST(m_compiler->getPreprocessor(), m_code_generator.get(), m_compiler->getASTContext());
+    }
+
+    diag_buf->EndSourceFile();
+
+    TextDiagnosticBuffer::const_iterator diag_iterator;
+
+    int num_errors = 0;
+    
+    if (m_pp_callbacks && m_pp_callbacks->hasErrors())
+    {
+        num_errors++;
+        
+        stream.PutCString(m_pp_callbacks->getErrorString().c_str());
+    }
+
+    for (diag_iterator = diag_buf->warn_begin();
+         diag_iterator != diag_buf->warn_end();
+         ++diag_iterator)
+        stream.Printf("warning: %s\n", (*diag_iterator).second.c_str());
+
+    for (diag_iterator = diag_buf->err_begin();
+         diag_iterator != diag_buf->err_end();
+         ++diag_iterator)
+    {
+        num_errors++;
+        stream.Printf("error: %s\n", (*diag_iterator).second.c_str());
+    }
+
+    for (diag_iterator = diag_buf->note_begin();
+         diag_iterator != diag_buf->note_end();
+         ++diag_iterator)
+        stream.Printf("note: %s\n", (*diag_iterator).second.c_str());
+
+    if (!num_errors)
+    {
+        if (type_system_helper->DeclMap() && !type_system_helper->DeclMap()->ResolveUnknownTypes())
+        {
+            stream.Printf("error: Couldn't infer the type of a variable\n");
+            num_errors++;
+        }
+    }
+
+    return num_errors;
+}
+
+static bool FindFunctionInModule (ConstString &mangled_name,
+                                  llvm::Module *module,
+                                  const char *orig_name)
+{
+    for (llvm::Module::iterator fi = module->getFunctionList().begin(), fe = module->getFunctionList().end();
+         fi != fe;
+         ++fi)
+    {
+        if (fi->getName().str().find(orig_name) != std::string::npos)
+        {
+            mangled_name.SetCString(fi->getName().str().c_str());
+            return true;
+        }
+    }
+
+    return false;
+}
+
+Error
+ClangExpressionParser::PrepareForExecution (lldb::addr_t &func_addr,
+                                            lldb::addr_t &func_end,
+                                            lldb::IRExecutionUnitSP &execution_unit_sp,
+                                            ExecutionContext &exe_ctx,
+                                            bool &can_interpret,
+                                            ExecutionPolicy execution_policy)
+{
+	func_addr = LLDB_INVALID_ADDRESS;
+	func_end = LLDB_INVALID_ADDRESS;
+    Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
+
+    Error err;
+
+    std::unique_ptr<llvm::Module> llvm_module_ap (m_code_generator->ReleaseModule());
+
+    if (!llvm_module_ap.get())
+    {
+        err.SetErrorToGenericError();
+        err.SetErrorString("IR doesn't contain a module");
+        return err;
+    }
+
+    // Find the actual name of the function (it's often mangled somehow)
+
+    ConstString function_name;
+
+    if (!FindFunctionInModule(function_name, llvm_module_ap.get(), m_expr.FunctionName()))
+    {
+        err.SetErrorToGenericError();
+        err.SetErrorStringWithFormat("Couldn't find %s() in the module", m_expr.FunctionName());
+        return err;
+    }
+    else
+    {
+        if (log)
+            log->Printf("Found function %s for %s", function_name.AsCString(), m_expr.FunctionName());
+    }
+
+    execution_unit_sp.reset(new IRExecutionUnit (m_llvm_context, // handed off here
+                                                 llvm_module_ap, // handed off here
+                                                 function_name,
+                                                 exe_ctx.GetTargetSP(),
+                                                 m_compiler->getTargetOpts().Features));
+
+    ClangExpressionHelper *type_system_helper = dyn_cast<ClangExpressionHelper>(m_expr.GetTypeSystemHelper());
+    ClangExpressionDeclMap *decl_map = type_system_helper->DeclMap(); // result can be NULL
+
+    if (decl_map)
+    {
+        Stream *error_stream = NULL;
+        Target *target = exe_ctx.GetTargetPtr();
+        if (target)
+            error_stream = target->GetDebugger().GetErrorFile().get();
+
+        IRForTarget ir_for_target(decl_map,
+                                  m_expr.NeedsVariableResolution(),
+                                  *execution_unit_sp,
+                                  error_stream,
+                                  function_name.AsCString());
+
+        bool ir_can_run = ir_for_target.runOnModule(*execution_unit_sp->GetModule());
+
+        Error interpret_error;
+        Process *process = exe_ctx.GetProcessPtr();
+
+        bool interpret_function_calls = !process ? false : process->CanInterpretFunctionCalls();
+        can_interpret = IRInterpreter::CanInterpret(*execution_unit_sp->GetModule(), *execution_unit_sp->GetFunction(), interpret_error, interpret_function_calls);
+
+
+        if (!ir_can_run)
+        {
+            err.SetErrorString("The expression could not be prepared to run in the target");
+            return err;
+        }
+
+        if (!can_interpret && execution_policy == eExecutionPolicyNever)
+        {
+            err.SetErrorStringWithFormat("Can't run the expression locally: %s", interpret_error.AsCString());
+            return err;
+        }
+
+        if (!process && execution_policy == eExecutionPolicyAlways)
+        {
+            err.SetErrorString("Expression needed to run in the target, but the target can't be run");
+            return err;
+        }
+
+        if (execution_policy == eExecutionPolicyAlways || !can_interpret)
+        {
+            if (m_expr.NeedsValidation() && process)
+            {
+                if (!process->GetDynamicCheckers())
+                {
+                    DynamicCheckerFunctions *dynamic_checkers = new DynamicCheckerFunctions();
+
+                    StreamString install_errors;
+
+                    if (!dynamic_checkers->Install(install_errors, exe_ctx))
+                    {
+                        if (install_errors.GetString().empty())
+                            err.SetErrorString ("couldn't install checkers, unknown error");
+                        else
+                            err.SetErrorString (install_errors.GetString().c_str());
+
+                        return err;
+                    }
+
+                    process->SetDynamicCheckers(dynamic_checkers);
+
+                    if (log)
+                        log->Printf("== [ClangUserExpression::Evaluate] Finished installing dynamic checkers ==");
+                }
+
+                IRDynamicChecks ir_dynamic_checks(*process->GetDynamicCheckers(), function_name.AsCString());
+
+                if (!ir_dynamic_checks.runOnModule(*execution_unit_sp->GetModule()))
+                {
+                    err.SetErrorToGenericError();
+                    err.SetErrorString("Couldn't add dynamic checks to the expression");
+                    return err;
+                }
+            }
+
+            execution_unit_sp->GetRunnableInfo(err, func_addr, func_end);
+        }
+    }
+    else
+    {
+        execution_unit_sp->GetRunnableInfo(err, func_addr, func_end);
+    }
+
+    return err;
+}