Initial import of svn+ssh:://svn.icir.org/bro/trunk/bro as of r7088

This commit is contained in:
Robin Sommer 2010-09-27 20:42:30 -07:00
commit 61757ac78b
1383 changed files with 380824 additions and 0 deletions

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// $Id: Var.cc 6219 2008-10-01 05:39:07Z vern $
//
// See the file "COPYING" in the main distribution directory for copyright.
#include "config.h"
#include "Var.h"
#include "Func.h"
#include "Stmt.h"
#include "Scope.h"
#include "Serializer.h"
#include "RemoteSerializer.h"
#include "EventRegistry.h"
static Val* init_val(Expr* init, const BroType* t, Val* aggr)
{
return init->InitVal(t, aggr);
}
static void make_var(ID* id, BroType* t, init_class c, Expr* init,
attr_list* attr, decl_type dt, int do_init)
{
if ( id->Type() )
{
if ( id->IsRedefinable() || (! init && attr) )
{
BroObj* redef_obj = init ? (BroObj*) init : (BroObj*) t;
if ( dt != VAR_REDEF )
id->Warn("redefinition requires \"redef\"", redef_obj, 1);
}
else if ( dt != VAR_REDEF || init || ! attr )
{
id->Error("already defined", init);
return;
}
}
if ( dt == VAR_REDEF )
{
if ( ! id->Type() )
{
id->Error("\"redef\" used but not previously defined");
return;
}
if ( ! t )
t = id->Type();
}
if ( id->Type() && id->Type()->Tag() != TYPE_ERROR )
{
if ( dt != VAR_REDEF &&
(! init || ! do_init || (! t && ! (t = init_type(init)))) )
{
id->Error("already defined", init);
return;
}
// Allow redeclaration in order to initialize.
if ( ! same_type(t, id->Type()) )
{
id->Error("redefinition changes type", init);
return;
}
}
if ( init && optimize )
init = init->Simplify(SIMPLIFY_GENERAL);
if ( t && t->IsSet() )
{ // Check for set with explicit elements.
SetType* st = t->AsTableType()->AsSetType();
ListExpr* elements = st->SetElements();
if ( elements )
{
if ( init )
{
id->Error("double initialization", init);
return;
}
Ref(elements);
init = elements;
}
}
if ( ! t )
{ // Take type from initialization.
if ( ! init )
{
id->Error("no type given");
return;
}
t = init_type(init);
if ( ! t )
{
id->SetType(error_type());
return;
}
}
else
Ref(t);
id->SetType(t);
if ( attr )
id->AddAttrs(new Attributes(attr, t));
if ( id->FindAttr(ATTR_PERSISTENT) || id->FindAttr(ATTR_SYNCHRONIZED) )
{
if ( dt == VAR_CONST )
{
id->Error("&persistant/synchronized with constant");
return;
}
if ( ! id->IsGlobal() )
{
id->Error("&persistant/synchronized with non-global");
return;
}
}
if ( do_init )
{
if ( (c == INIT_EXTRA && id->FindAttr(ATTR_ADD_FUNC)) ||
(c == INIT_REMOVE && id->FindAttr(ATTR_DEL_FUNC)) )
// Just apply the function.
id->SetVal(init, c);
else if ( dt != VAR_REDEF || init || ! attr )
{
Val* aggr;
if ( t->Tag() == TYPE_RECORD )
aggr = new RecordVal(t->AsRecordType());
else if ( t->Tag() == TYPE_TABLE )
aggr = new TableVal(t->AsTableType(), id->Attrs());
else if ( t->Tag() == TYPE_VECTOR )
aggr = new VectorVal(t->AsVectorType());
else
aggr = 0;
Val* v = 0;
if ( init )
{
v = init_val(init, t, aggr);
if ( ! v )
return;
}
if ( aggr )
id->SetVal(aggr, c);
else if ( v )
id->SetVal(v, c);
}
}
if ( dt == VAR_CONST )
{
if ( ! init && ! id->IsRedefinable() )
id->Error("const variable must be initialized");
id->SetConst();
}
id->UpdateValAttrs();
}
void add_global(ID* id, BroType* t, init_class c, Expr* init,
attr_list* attr, decl_type dt)
{
make_var(id, t, c, init, attr, dt, 1);
}
Stmt* add_local(ID* id, BroType* t, init_class c, Expr* init,
attr_list* attr, decl_type dt)
{
make_var(id, t, c, init, attr, dt, 0);
if ( init )
{
if ( c != INIT_FULL )
id->Error("can't use += / -= for initializations of local variables");
Ref(id);
Stmt* stmt =
new ExprStmt(new AssignExpr(new NameExpr(id), init, 0));
stmt->SetLocationInfo(init->GetLocationInfo());
return stmt;
}
else
{
if ( t->Tag() == TYPE_RECORD || t->Tag() == TYPE_TABLE ||
t->Tag() == TYPE_VECTOR )
current_scope()->AddInit(id);
return new NullStmt;
}
}
extern Expr* add_and_assign_local(ID* id, Expr* init, Val* val)
{
make_var(id, 0, INIT_FULL, init, 0, VAR_REGULAR, 0);
Ref(id);
return new AssignExpr(new NameExpr(id), init, 0, val);
}
void add_type(ID* id, BroType* t, attr_list* attr, int /* is_event */)
{
id->SetType(t);
id->MakeType();
if ( attr )
id->SetAttrs(new Attributes(attr, t));
}
void begin_func(ID* id, const char* module_name, function_flavor flavor,
int is_redef, FuncType* t)
{
if ( flavor == FUNC_FLAVOR_EVENT )
{
const BroType* yt = t->YieldType();
if ( yt && yt->Tag() != TYPE_VOID )
id->Error("event cannot yield a value", t);
t->ClearYieldType();
}
if ( id->Type() )
{
if ( ! same_type(id->Type(), t) )
id->Type()->Error("incompatible types", t);
}
else if ( is_redef )
id->Error("redef of not-previously-declared value");
if ( id->HasVal() )
{
int id_is_event = id->ID_Val()->AsFunc()->IsEvent();
if ( id_is_event != (flavor == FUNC_FLAVOR_EVENT) )
id->Error("inconsistency between event and function", t);
if ( id_is_event )
{
if ( is_redef )
// Clear out value so it will be replaced.
id->SetVal(0);
}
else
{
if ( ! id->IsRedefinable() )
id->Error("already defined");
}
}
else
id->SetType(t);
push_scope(id);
RecordType* args = t->Args();
int num_args = args->NumFields();
for ( int i = 0; i < num_args; ++i )
{
TypeDecl* arg_i = args->FieldDecl(i);
ID* arg_id = lookup_ID(arg_i->id, module_name);
if ( arg_id && ! arg_id->IsGlobal() )
arg_id->Error("argument name used twice");
arg_id = install_ID(copy_string(arg_i->id), module_name,
false, false);
arg_id->SetType(arg_i->type->Ref());
}
}
void end_func(Stmt* body, attr_list* attrs)
{
int frame_size = current_scope()->Length();
id_list* inits = current_scope()->GetInits();
Scope* scope = pop_scope();
ID* id = scope->ScopeID();
int priority = 0;
if ( attrs )
{
loop_over_list(*attrs, i)
{
Attr* a = (*attrs)[i];
if ( a->Tag() != ATTR_PRIORITY )
{
a->Error("illegal attribute for function body");
continue;
}
Val* v = a->AttrExpr()->Eval(0);
if ( ! v )
{
a->Error("cannot evaluate attribute expression");
continue;
}
if ( ! IsIntegral(v->Type()->Tag()) )
{
a->Error("expression is not of integral type");
continue;
}
priority = v->InternalInt();
}
}
if ( id->HasVal() )
id->ID_Val()->AsFunc()->AddBody(body, inits, frame_size, priority);
else
{
Func* f = new BroFunc(id, body, inits, frame_size);
id->SetVal(new Val(f));
id->SetConst();
}
id->ID_Val()->AsFunc()->SetScope(scope);
}
Val* internal_val(const char* name)
{
ID* id = lookup_ID(name, GLOBAL_MODULE_NAME);
if ( ! id )
internal_error("internal variable %s missing", name);
return id->ID_Val();
}
Val* opt_internal_val(const char* name)
{
ID* id = lookup_ID(name, GLOBAL_MODULE_NAME);
return id ? id->ID_Val() : 0;
}
double opt_internal_double(const char* name)
{
Val* v = opt_internal_val(name);
return v ? v->InternalDouble() : 0.0;
}
bro_int_t opt_internal_int(const char* name)
{
Val* v = opt_internal_val(name);
return v ? v->InternalInt() : 0;
}
bro_uint_t opt_internal_unsigned(const char* name)
{
Val* v = opt_internal_val(name);
return v ? v->InternalUnsigned() : 0;
}
StringVal* opt_internal_string(const char* name)
{
Val* v = opt_internal_val(name);
return v ? v->AsStringVal() : 0;
}
TableVal* opt_internal_table(const char* name)
{
Val* v = opt_internal_val(name);
return v ? v->AsTableVal() : 0;
}
ListVal* internal_list_val(const char* name)
{
ID* id = lookup_ID(name, GLOBAL_MODULE_NAME);
if ( ! id )
return 0;
Val* v = id->ID_Val();
if ( v )
{
if ( v->Type()->Tag() == TYPE_LIST )
return (ListVal*) v;
else if ( v->Type()->IsSet() )
{
TableVal* tv = v->AsTableVal();
ListVal* lv = tv->ConvertToPureList();
return lv;
}
else
internal_error("internal variable %s is not a list", name);
}
return 0;
}
BroType* internal_type(const char* name)
{
ID* id = lookup_ID(name, GLOBAL_MODULE_NAME);
if ( ! id )
internal_error("internal type %s missing", name);
return id->Type();
}
Func* internal_func(const char* name)
{
Val* v = internal_val(name);
if ( v )
return v->AsFunc();
else
return 0;
}
EventHandlerPtr internal_handler(const char* name)
{
// If there already is an entry in the registry, we have a
// local handler on the script layer.
EventHandler* h = event_registry->Lookup(name);
if ( h )
{
h->SetUsed();
return h;
}
h = new EventHandler(name);
event_registry->Register(h);
h->SetUsed();
return h;
}