introduced simplified initialization for non-standalone -O gen-C++ code

tied -O gen-standalone-C++ to use of --optimize-files

src/script_opt/CPP/Driver.h

@@ -60,6 +60,11 @@ void GenFinishInit();
 // Generate the function that registers compiled script bodies.
 void GenRegisterBodies();
 
+public:
+// Whether we're generating "standalone" code.
+bool TargetingStandalone() const { return standalone; }
+
+private:
 // True if the given function (plus body and profile) is one that should be
 // compiled.  If non-nil, sets reason to the the reason why, if there's a
 // fundamental problem.  If however the function should be skipped for other

src/script_opt/CPP/Inits.cc

@@ -104,11 +104,18 @@ void CPPCompile::InitializeFieldMappings() {
 
     StartBlock();
 
+    string type_arg, attrs_arg;
+    if ( ! standalone )
+        type_arg = attrs_arg = "DO_NOT_CONSTRUCT_VALUE_MARKER";
+
     for ( const auto& mapping : field_decls ) {
         auto rt_arg = Fmt(mapping.first);
         auto td = mapping.second;
-        auto type_arg = Fmt(TypeOffset(td->type));
+
-        auto attrs_arg = Fmt(AttributesOffset(td->attrs));
+        if ( standalone ) {
+            type_arg = Fmt(TypeOffset(td->type));
+            attrs_arg = Fmt(AttributesOffset(td->attrs));
+        }
 
         Emit("CPP_FieldMapping(%s, \"%s\", %s, %s),", rt_arg, td->id, type_arg, attrs_arg);
     }
@@ -121,8 +128,10 @@ void CPPCompile::InitializeEnumMappings() {
 
     StartBlock();
 
+    auto create_if_missing = standalone ? "true" : "false";
+
     for ( const auto& mapping : enum_names )
-        Emit("CPP_EnumMapping(%s, \"%s\"),", Fmt(mapping.first), mapping.second);
+        Emit("CPP_EnumMapping(%s, \"%s\", %s),", Fmt(mapping.first), mapping.second, create_if_missing);
 
     EndBlock(true);
 }
@@ -178,9 +187,15 @@ void CPPCompile::InitializeGlobals() {
     Emit("Frame* f__CPP = nullptr;");
     NL();
 
+    auto& ofiles = analysis_options.only_files;
+
     for ( const auto& ginit : IDOptInfo::GetGlobalInitExprs() ) {
         auto g = ginit.Id();
-        if ( pfs->Globals().count(g) == 0 )
+
+        if ( ! ofiles.empty() && ! obj_matches_opt_files(g) )
+            continue;
+
+        if ( accessed_globals.count(g) == 0 )
             continue;
 
         auto ic = ginit.IC();

src/script_opt/CPP/InitsInfo.cc

@@ -355,10 +355,18 @@ AttrsInfo::AttrsInfo(CPPCompile* _c, const AttributesPtr& _attrs) : CompoundItem
     }
 }
 
-GlobalInitInfo::GlobalInitInfo(CPPCompile* c, const ID* g, string _CPP_name)
+GlobalLookupInitInfo::GlobalLookupInitInfo(CPPCompile* c, const ID* g, string _CPP_name)
     : CPP_InitInfo(g), CPP_name(std::move(_CPP_name)) {
     Zeek_name = g->Name();
+}
 
+void GlobalLookupInitInfo::InitializerVals(std::vector<std::string>& ivs) const {
+    ivs.push_back(CPP_name);
+    ivs.push_back(string("\"") + Zeek_name + "\"");
+}
+
+GlobalInitInfo::GlobalInitInfo(CPPCompile* c, const ID* g, string _CPP_name)
+    : GlobalLookupInitInfo(c, g, std::move(_CPP_name)) {
     auto& gt = g->GetType();
     auto gi = c->RegisterType(gt);
     init_cohort = max(init_cohort, gi->InitCohort() + 1);
@@ -375,7 +383,7 @@ GlobalInitInfo::GlobalInitInfo(CPPCompile* c, const ID* g, string _CPP_name)
     exported = g->IsExport();
     val = ValElem(c, nullptr); // empty because we initialize dynamically
 
-    if ( gt->Tag() == TYPE_FUNC && ! g->GetVal() )
+    if ( gt->Tag() == TYPE_FUNC && (! g->GetVal() || g->GetVal()->AsFunc()->GetKind() == Func::BUILTIN_FUNC) )
         // Remember this peculiarity so we can recreate it for
         // error-behavior-compatibility.
         func_with_no_val = true;
@@ -549,7 +557,7 @@ RecordTypeInfo::RecordTypeInfo(CPPCompile* _c, TypePtr _t) : AbstractTypeInfo(_c
 
         field_types.push_back(r_i->type);
 
-        if ( r_i->attrs ) {
+        if ( c->TargetingStandalone() && r_i->attrs ) {
             gi = c->RegisterAttributes(r_i->attrs);
             final_init_cohort = max(final_init_cohort, gi->InitCohort() + 1);
             field_attrs.push_back(gi->Offset());
@@ -576,6 +584,13 @@ void RecordTypeInfo::AddInitializerVals(std::vector<std::string>& ivs) const {
     }
 }
 
+NamedTypeInfo::NamedTypeInfo(CPPCompile* _c, TypePtr _t) : AbstractTypeInfo(_c, std::move(_t)) {}
+
+void NamedTypeInfo::AddInitializerVals(std::vector<std::string>& ivs) const {
+    ivs.emplace_back(Fmt(NAMED_TYPE_MARKER));
+    ivs.emplace_back(Fmt(c->TrackString(t->GetName())));
+}
+
 void IndicesManager::Generate(CPPCompile* c) {
     c->Emit("int CPP__Indices__init[] =");
     c->StartBlock();

src/script_opt/CPP/InitsInfo.h

@@ -478,8 +478,22 @@ public:
     AttrsInfo(CPPCompile* c, const AttributesPtr& attrs);
 };
 
-// Information for initialization a Zeek global.
+// A lightweight initializer for a Zeek global that will look it up at
-class GlobalInitInfo : public CPP_InitInfo {
+// initialization time but not create it if missing.
+class GlobalLookupInitInfo : public CPP_InitInfo {
+public:
+    GlobalLookupInitInfo(CPPCompile* c, const ID* g, std::string CPP_name);
+
+    std::string InitializerType() const override { return "CPP_GlobalLookupInit"; }
+    void InitializerVals(std::vector<std::string>& ivs) const override;
+
+protected:
+    std::string Zeek_name;
+    std::string CPP_name;
+};
+
+// Information for initializing a Zeek global.
+class GlobalInitInfo : public GlobalLookupInitInfo {
 public:
     GlobalInitInfo(CPPCompile* c, const ID* g, std::string CPP_name);
 
@@ -639,6 +653,14 @@ private:
     std::vector<int> field_attrs;
 };
 
+// Class for initializing a named Zeek type that should be present at startup.
+class NamedTypeInfo : public AbstractTypeInfo {
+public:
+    NamedTypeInfo(CPPCompile* c, TypePtr _t);
+
+    void AddInitializerVals(std::vector<std::string>& ivs) const override;
+};
+
 // Much of the table-driven initialization is based on vectors of indices,
 // which we represent as vectors of int's, where each int is used to index a
 // global C++ vector.  This class manages such vectors.  In particular, it

src/script_opt/CPP/README.md

@@ -90,7 +90,7 @@ and also any compiled-to-C++ bodies present in the `zeek` binary that
 The above workflows require the subsequent `zeek` execution to include
 the `target.zeek` script.  You can avoid this by replacing the first step with:
 
-1. `./src/zeek -O gen-standalone-C++ target.zeek >target-stand-in.zeek`
+1. `./src/zeek -O gen-standalone-C++ --optimize-files=target.zeek target.zeek >target-stand-in.zeek`
 
 (and then building as in the 2nd step above).
 This option prints to _stdout_ a 
@@ -100,13 +100,9 @@ without needing to include `target.zeek` in the invocation (nor
 the `-O use-C++` option).  After loading the stand-in script,
 you can still access types and functions declared in `target.zeek`.
 
-Note: the implementation differences between `gen-C++` and `gen-standalone-C++`
+Note: `gen-standalone-C++` _must_ be used with `--optimize-files`, as the
-wound up being modest enough that it might make sense to just always provide
+compiler needs the latter to determine which global declarations the
-the latter functionality, which it turns out does not introduce any
+standalone code needs to initialize.
-additional constraints compared to the current `gen-C++` functionality.
-On the other hand, it's possible (not yet established) that code created
-using `gen-C++` can be made to compile significantly faster than
-standalone code.
 
 There are additional workflows relating to running the test suite: see
 `src/script_opt/CPP/maint/README`.

src/script_opt/CPP/RuntimeInits.cc

@@ -235,7 +235,7 @@ void CPP_TypeInits::PreInit(InitsManager* im, int offset, ValElemVec& init_vals)
     if ( tag == TYPE_LIST )
         inits_vec[offset] = make_intrusive<TypeList>();
 
-    else if ( tag == TYPE_RECORD ) {
+    else if ( tag == TYPE_RECORD && init_vals[1] != NAMED_TYPE_MARKER ) {
         auto name = im->Strings(init_vals[1]);
         if ( name[0] )
             inits_vec[offset] = get_record_type__CPP(name);
@@ -243,7 +243,7 @@ void CPP_TypeInits::PreInit(InitsManager* im, int offset, ValElemVec& init_vals)
             inits_vec[offset] = get_record_type__CPP(nullptr);
     }
 
-    else if ( tag == TYPE_TABLE )
+    else if ( tag == TYPE_TABLE && init_vals[1] != NAMED_TYPE_MARKER )
         inits_vec[offset] = make_intrusive<CPPTableType>();
 
     // else no pre-initialization needed
@@ -251,6 +251,13 @@ void CPP_TypeInits::PreInit(InitsManager* im, int offset, ValElemVec& init_vals)
 
 void CPP_TypeInits::Generate(InitsManager* im, vector<TypePtr>& ivec, int offset, ValElemVec& init_vals) const {
     auto tag = static_cast<TypeTag>(init_vals[0]);
+
+    if ( init_vals.size() > 1 && init_vals[1] == NAMED_TYPE_MARKER ) {
+        auto name = im->Strings(init_vals[2]);
+        ivec[offset] = find_global__CPP(name)->GetType();
+        return;
+    }
+
     TypePtr t;
     switch ( tag ) {
         case TYPE_ADDR:
@@ -406,6 +413,11 @@ int CPP_FieldMapping::ComputeOffset(InitsManager* im) const {
     auto fm_offset = r->FieldOffset(field_name.c_str());
 
     if ( fm_offset < 0 ) { // field does not exist, create it
+        if ( field_type == DO_NOT_CONSTRUCT_VALUE_MARKER ) {
+            reporter->CPPRuntimeError("record field \"%s\" missing in %s", field_name.c_str(), obj_desc(r).c_str());
+            exit(1);
+        }
+
         fm_offset = r->NumFields();
 
         auto id = util::copy_string(field_name.c_str(), field_name.size());
@@ -429,6 +441,11 @@ int CPP_EnumMapping::ComputeOffset(InitsManager* im) const {
 
     auto em_offset = e->Lookup(e_name);
     if ( em_offset < 0 ) { // enum constant does not exist, create it
+        if ( ! construct_if_missing ) {
+            reporter->CPPRuntimeError("enum element \"%s\" missing in %s", e_name.c_str(), obj_desc(e).c_str());
+            exit(1);
+        }
+
         em_offset = e->Names().size();
         if ( e->Lookup(em_offset) )
             reporter->InternalError("enum inconsistency while initializing compiled scripts");
@@ -438,6 +455,10 @@ int CPP_EnumMapping::ComputeOffset(InitsManager* im) const {
     return em_offset;
 }
 
+void CPP_GlobalLookupInit::Generate(InitsManager* im, std::vector<void*>& /* inits_vec */, int /* offset */) const {
+    global = find_global__CPP(name);
+}
+
 void CPP_GlobalInit::Generate(InitsManager* im, std::vector<void*>& /* inits_vec */, int /* offset */) const {
     auto& t = im->Types(type);
     global = lookup_global__CPP(name, t, exported);

src/script_opt/CPP/RuntimeInits.h

@@ -41,6 +41,14 @@ extern std::vector<std::vector<std::vector<int>>> generate_indices_set(int* init
 #define END_OF_VEC_VEC -100
 #define END_OF_VEC_VEC_VEC -200
 
+// A marker value for "named" types (those that are simply looked up by
+// name at initialization time).
+#define NAMED_TYPE_MARKER -300
+
+// A marker value indicating values that should not be constructed if not
+// already present.
+#define DO_NOT_CONSTRUCT_VALUE_MARKER -400
+
 // An abstract helper class used to access elements of an initialization vector.
 // We need the abstraction because InitsManager below needs to be able to refer
 // to any of a range of templated classes.
@@ -369,8 +377,19 @@ public:
     }
 };
 
-// Class for initializing a Zeek global.  These don't go into an initialization
+// Classes for initializing Zeek globals.  These don't go into an initialization
 // vector, so we use void* as the underlying type.
+class CPP_GlobalLookupInit : public CPP_Init<void*> {
+public:
+    CPP_GlobalLookupInit(IDPtr& _global, const char* _name) : CPP_Init<void*>(), global(_global), name(_name) {}
+
+    void Generate(InitsManager* im, std::vector<void*>& /* inits_vec */, int /* offset */) const override;
+
+protected:
+    IDPtr& global;
+    const char* name;
+};
+
 class CPP_GlobalInit : public CPP_Init<void*> {
 public:
     CPP_GlobalInit(IDPtr& _global, const char* _name, int _type, int _attrs, int _val, bool _exported,
@@ -463,7 +482,11 @@ public:
 private:
     int rec;                // index to retrieve the record's type
     std::string field_name; // which field this offset pertains to
-    int field_type;         // the field's type, in case we have to construct it
+
+    // The field's type, in case we have to construct it. If
+    // DO_NOT_CONSTRUCT_VALUE_MARKER then it's instead an error
+    // if missing.
+    int field_type;
     int field_attrs; // the same for the field's attributes
 };
 
@@ -473,13 +496,15 @@ private:
 // the enum).
 class CPP_EnumMapping {
 public:
-    CPP_EnumMapping(int _e_type, std::string _e_name) : e_type(_e_type), e_name(std::move(_e_name)) {}
+    CPP_EnumMapping(int _e_type, std::string _e_name, bool _construct_if_missing)
+        : e_type(_e_type), e_name(std::move(_e_name)), construct_if_missing(_construct_if_missing) {}
 
     int ComputeOffset(InitsManager* im) const;
 
 private:
     int e_type;                // index to EnumType
     std::string e_name;        // which enum constant for that type
+    bool construct_if_missing; // if true, construct constant if not present
 };
 
 // Looks up a BiF of the given name, making it available to compiled

src/script_opt/CPP/Types.cc

@@ -191,6 +191,7 @@ shared_ptr<CPP_InitInfo> CPPCompile::RegisterType(const TypePtr& tp) {
 
     shared_ptr<CPP_InitInfo> gi;
 
+    if ( standalone || t->GetName().empty() ) {
         switch ( t->Tag() ) {
             case TYPE_ADDR:
             case TYPE_ANY:
@@ -226,6 +227,9 @@ shared_ptr<CPP_InitInfo> CPPCompile::RegisterType(const TypePtr& tp) {
 
             default: reporter->InternalError("bad type in CPPCompile::RegisterType");
         }
+    }
+    else
+        gi = make_shared<NamedTypeInfo>(this, tp);
 
     type_info->AddInstance(gi);
     processed_types[t] = gi;

src/script_opt/CPP/Vars.cc

@@ -11,7 +11,7 @@ void CPPCompile::CreateGlobal(const ID* g) {
     auto gn = string(g->Name());
     bool is_bif = pfs->BiFGlobals().count(g) > 0;
 
-    if ( pfs->Globals().count(g) == 0 ) {
+    if ( accessed_globals.count(g) == 0 ) {
         // Only used in the context of calls.  If it's compilable,
         // then we'll call it directly.
         if ( compilable_funcs.count(gn) > 0 ) {
@@ -28,11 +28,16 @@ void CPPCompile::CreateGlobal(const ID* g) {
     if ( AddGlobal(gn, "gl") ) { // We'll be creating this global.
         Emit("IDPtr %s;", globals[gn]);
 
-        if ( pfs->Events().count(gn) > 0 )
+        if ( accessed_events.count(gn) > 0 )
             // This is an event that's also used as a variable.
             Emit("EventHandlerPtr %s_ev;", globals[gn]);
 
-        auto gi = make_shared<GlobalInitInfo>(this, g, globals[gn]);
+        shared_ptr<CPP_InitInfo> gi;
+        if ( standalone )
+            gi = make_shared<GlobalInitInfo>(this, g, globals[gn]);
+        else
+            gi = make_shared<GlobalLookupInitInfo>(this, g, globals[gn]);
+
         global_id_info->AddInstance(gi);
         global_gis[g] = gi;
     }
@@ -64,7 +69,12 @@ std::shared_ptr<CPP_InitInfo> CPPCompile::RegisterGlobal(const ID* g) {
             return gg->second;
     }
 
-    auto gi = make_shared<GlobalInitInfo>(this, g, globals[gn]);
+    shared_ptr<CPP_InitInfo> gi;
+    if ( standalone )
+        gi = make_shared<GlobalInitInfo>(this, g, globals[gn]);
+    else
+        gi = make_shared<GlobalLookupInitInfo>(this, g, globals[gn]);
+
     global_id_info->AddInstance(gi);
     global_gis[g] = gi;
 

src/script_opt/ScriptOpt.cc

@@ -109,13 +109,25 @@ bool should_analyze(const ScriptFuncPtr& f, const StmtPtr& body) {
     if ( ofiles.empty() && ofuncs.empty() )
         return true;
 
+    if ( obj_matches_opt_files(body.get()) )
+        return true;
+
     const auto& fun = f->GetName();
 
     for ( auto& o : ofuncs )
         if ( std::regex_match(fun, o) )
             return true;
 
-    auto fin = util::detail::normalize_path(body->GetLocationInfo()->filename);
+    return false;
+}
+
+bool obj_matches_opt_files(const Obj* obj) {
+    auto& ofiles = analysis_options.only_files;
+
+    if ( ofiles.empty() )
+        return false;
+
+    auto fin = util::detail::normalize_path(obj->GetLocationInfo()->filename);
 
     for ( auto& o : ofiles )
         if ( std::regex_match(fin, o) )
@@ -285,8 +297,12 @@ static void init_options() {
     check_env_opt("ZEEK_USE_CPP", analysis_options.use_CPP);
     check_env_opt("ZEEK_ALLOW_COND", analysis_options.allow_cond);
 
-    if ( analysis_options.gen_standalone_CPP )
+    if ( analysis_options.gen_standalone_CPP ) {
+        if ( analysis_options.only_files.empty() )
+            reporter->FatalError("-O gen-standalone-C++ requires use of --optimize-files");
+
         analysis_options.gen_CPP = true;
+    }
 
     if ( analysis_options.gen_CPP )
         generating_CPP = true;

src/script_opt/ScriptOpt.h

@@ -247,6 +247,10 @@ extern void add_file_analysis_pattern(AnalyOpt& opts, const char* pat);
 // it should be skipped.
 extern bool should_analyze(const ScriptFuncPtr& f, const StmtPtr& body);
 
+// True if the given object's location matches one specified by
+// --optimize-files=...
+extern bool obj_matches_opt_files(const Obj* obj);
+
 // Analyze all of the parsed scripts collectively for usage issues (unless
 // suppressed by the flag) and optimization.
 extern void analyze_scripts(bool no_unused_warnings);