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Expr.cc
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// See the file "COPYING" in the main distribution directory for copyright.
#include "zeek-config.h"
#include "Expr.h"
#include "Event.h"
#include "Desc.h"
#include "Frame.h"
#include "Func.h"
#include "RE.h"
#include "Scope.h"
#include "Stmt.h"
#include "EventRegistry.h"
#include "Net.h"
#include "Traverse.h"
#include "Trigger.h"
#include "IPAddr.h"
#include "digest.h"
#include "module_util.h"
#include "DebugLogger.h"
#include "broker/Data.h"
const char* expr_name(BroExprTag t)
{
static const char* expr_names[int(NUM_EXPRS)] = {
"name", "const",
"(*)",
"++", "--", "!", "~", "+", "-",
"+", "-", "+=", "-=", "*", "/", "%",
"&", "|", "^",
"&&", "||",
"<", "<=", "==", "!=", ">=", ">", "?:", "ref",
"=", "[]", "$", "?$", "[=]",
"table()", "set()", "vector()",
"$=", "in", "<<>>",
"()", "function()", "event", "schedule",
"coerce", "record_coerce", "table_coerce",
"sizeof", "flatten", "cast", "is", "[:]="
};
if ( int(t) >= NUM_EXPRS )
{
static char errbuf[512];
// This isn't quite right - we return a static buffer,
// so multiple calls to expr_name() could lead to confusion
// by overwriting the buffer. But oh well.
snprintf(errbuf, sizeof(errbuf),
"%d: not an expression tag", int(t));
return errbuf;
}
return expr_names[int(t)];
}
Expr::Expr(BroExprTag arg_tag)
{
tag = arg_tag;
type = 0;
paren = 0;
SetLocationInfo(&start_location, &end_location);
}
Expr::~Expr()
{
Unref(type);
}
int Expr::CanAdd() const
{
return 0;
}
int Expr::CanDel() const
{
return 0;
}
void Expr::Add(Frame* /* f */)
{
Internal("Expr::Delete called");
}
void Expr::Delete(Frame* /* f */)
{
Internal("Expr::Delete called");
}
Expr* Expr::MakeLvalue()
{
if ( ! IsError() )
ExprError("can't be assigned to");
return this;
}
void Expr::EvalIntoAggregate(const BroType* /* t */, Val* /* aggr */,
Frame* /* f */) const
{
Internal("Expr::EvalIntoAggregate called");
}
void Expr::Assign(Frame* /* f */, Val* /* v */)
{
Internal("Expr::Assign called");
}
BroType* Expr::InitType() const
{
return type->Ref();
}
int Expr::IsRecordElement(TypeDecl* /* td */) const
{
return 0;
}
int Expr::IsPure() const
{
return 1;
}
Val* Expr::InitVal(const BroType* t, Val* aggr) const
{
if ( aggr )
{
Error("bad initializer");
return 0;
}
if ( IsError() )
return 0;
return check_and_promote(Eval(0), t, 1);
}
int Expr::IsError() const
{
return type && type->Tag() == TYPE_ERROR;
}
void Expr::SetError()
{
SetType(error_type());
}
void Expr::SetError(const char* msg)
{
Error(msg);
SetError();
}
int Expr::IsZero() const
{
return IsConst() && ExprVal()->IsZero();
}
int Expr::IsOne() const
{
return IsConst() && ExprVal()->IsOne();
}
void Expr::Describe(ODesc* d) const
{
if ( IsParen() && ! d->IsBinary() )
d->Add("(");
if ( d->IsPortable() || d->IsBinary() )
AddTag(d);
ExprDescribe(d);
if ( IsParen() && ! d->IsBinary() )
d->Add(")");
}
void Expr::AddTag(ODesc* d) const
{
if ( d->IsBinary() )
d->Add(int(Tag()));
else
d->AddSP(expr_name(Tag()));
}
void Expr::Canonicize()
{
}
void Expr::SetType(BroType* t)
{
if ( ! type || type->Tag() != TYPE_ERROR )
{
Unref(type);
type = t;
}
else
Unref(t);
}
void Expr::ExprError(const char msg[])
{
Error(msg);
SetError();
}
void Expr::RuntimeError(const std::string& msg) const
{
reporter->ExprRuntimeError(this, "%s", msg.data());
}
void Expr::RuntimeErrorWithCallStack(const std::string& msg) const
{
auto rcs = render_call_stack();
if ( rcs.empty() )
reporter->ExprRuntimeError(this, "%s", msg.data());
else
{
ODesc d;
d.SetShort();
Describe(&d);
reporter->RuntimeError(GetLocationInfo(), "%s, expression: %s, call stack: %s",
msg.data(), d.Description(), rcs.data());
}
}
NameExpr::NameExpr(ID* arg_id, bool const_init) : Expr(EXPR_NAME)
{
id = arg_id;
in_const_init = const_init;
if ( id->AsType() )
SetType(new TypeType(id->AsType()));
else
SetType(id->Type()->Ref());
EventHandler* h = event_registry->Lookup(id->Name());
if ( h )
h->SetUsed();
}
NameExpr::~NameExpr()
{
Unref(id);
}
Val* NameExpr::Eval(Frame* f) const
{
Val* v;
if ( id->AsType() )
return new Val(id->AsType(), true);
if ( id->IsGlobal() )
v = id->ID_Val();
else if ( f )
v = f->GetElement(id);
else
// No frame - evaluating for Simplify() purposes
return 0;
if ( v )
return v->Ref();
else
{
RuntimeError("value used but not set");
return 0;
}
}
Expr* NameExpr::MakeLvalue()
{
if ( id->AsType() )
ExprError("Type name is not an lvalue");
if ( id->IsConst() && ! in_const_init )
ExprError("const is not a modifiable lvalue");
if ( id->IsOption() && ! in_const_init )
ExprError("option is not a modifiable lvalue");
return new RefExpr(this);
}
void NameExpr::Assign(Frame* f, Val* v)
{
if ( id->IsGlobal() )
id->SetVal(v);
else
f->SetElement(id, v);
}
int NameExpr::IsPure() const
{
return id->IsConst();
}
TraversalCode NameExpr::Traverse(TraversalCallback* cb) const
{
TraversalCode tc = cb->PreExpr(this);
HANDLE_TC_EXPR_PRE(tc);
tc = id->Traverse(cb);
HANDLE_TC_EXPR_PRE(tc);
tc = cb->PostExpr(this);
HANDLE_TC_EXPR_POST(tc);
}
void NameExpr::ExprDescribe(ODesc* d) const
{
if ( d->IsReadable() )
d->Add(id->Name());
else
{
if ( d->IsPortable() )
d->Add(id->Name());
else
d->AddCS(id->Name());
}
}
ConstExpr::ConstExpr(Val* arg_val) : Expr(EXPR_CONST)
{
val = arg_val;
if ( val->Type()->Tag() == TYPE_LIST && val->AsListVal()->Length() == 1 )
{
val = val->AsListVal()->Index(0);
val->Ref();
Unref(arg_val);
}
SetType(val->Type()->Ref());
}
ConstExpr::~ConstExpr()
{
Unref(val);
}
void ConstExpr::ExprDescribe(ODesc* d) const
{
val->Describe(d);
}
Val* ConstExpr::Eval(Frame* /* f */) const
{
return Value()->Ref();
}
TraversalCode ConstExpr::Traverse(TraversalCallback* cb) const
{
TraversalCode tc = cb->PreExpr(this);
HANDLE_TC_EXPR_PRE(tc);
tc = cb->PostExpr(this);
HANDLE_TC_EXPR_POST(tc);
}
UnaryExpr::UnaryExpr(BroExprTag arg_tag, Expr* arg_op) : Expr(arg_tag)
{
op = arg_op;
if ( op->IsError() )
SetError();
}
UnaryExpr::~UnaryExpr()
{
Unref(op);
}
Val* UnaryExpr::Eval(Frame* f) const
{
if ( IsError() )
return 0;
Val* v = op->Eval(f);
if ( ! v )
return 0;
if ( is_vector(v) && Tag() != EXPR_IS && Tag() != EXPR_CAST )
{
VectorVal* v_op = v->AsVectorVal();
VectorType* out_t;
if ( Type()->Tag() == TYPE_ANY )
out_t = v->Type()->AsVectorType();
else
out_t = Type()->AsVectorType();
VectorVal* result = new VectorVal(out_t);
for ( unsigned int i = 0; i < v_op->Size(); ++i )
{
Val* v_i = v_op->Lookup(i);
result->Assign(i, v_i ? Fold(v_i) : 0);
}
Unref(v);
return result;
}
else
{
Val* result = Fold(v);
Unref(v);
return result;
}
}
int UnaryExpr::IsPure() const
{
return op->IsPure();
}
TraversalCode UnaryExpr::Traverse(TraversalCallback* cb) const
{
TraversalCode tc = cb->PreExpr(this);
HANDLE_TC_EXPR_PRE(tc);
tc = op->Traverse(cb);
HANDLE_TC_EXPR_PRE(tc);
tc = cb->PostExpr(this);
HANDLE_TC_EXPR_POST(tc);
}
Val* UnaryExpr::Fold(Val* v) const
{
return v->Ref();
}
void UnaryExpr::ExprDescribe(ODesc* d) const
{
bool is_coerce =
Tag() == EXPR_ARITH_COERCE || Tag() == EXPR_RECORD_COERCE ||
Tag() == EXPR_TABLE_COERCE;
if ( d->IsReadable() )
{
if ( is_coerce )
d->Add("(coerce ");
else if ( Tag() == EXPR_FLATTEN )
d->Add("flatten ");
else if ( Tag() != EXPR_REF )
d->Add(expr_name(Tag()));
}
op->Describe(d);
if ( d->IsReadable() && is_coerce )
{
d->Add(" to ");
Type()->Describe(d);
d->Add(")");
}
}
BinaryExpr::~BinaryExpr()
{
Unref(op1);
Unref(op2);
}
Val* BinaryExpr::Eval(Frame* f) const
{
if ( IsError() )
return 0;
Val* v1 = op1->Eval(f);
if ( ! v1 )
return 0;
Val* v2 = op2->Eval(f);
if ( ! v2 )
{
Unref(v1);
return 0;
}
Val* result = 0;
int is_vec1 = is_vector(v1);
int is_vec2 = is_vector(v2);
if ( is_vec1 && is_vec2 )
{ // fold pairs of elements
VectorVal* v_op1 = v1->AsVectorVal();
VectorVal* v_op2 = v2->AsVectorVal();
if ( v_op1->Size() != v_op2->Size() )
{
RuntimeError("vector operands are of different sizes");
return 0;
}
VectorVal* v_result = new VectorVal(Type()->AsVectorType());
for ( unsigned int i = 0; i < v_op1->Size(); ++i )
{
if ( v_op1->Lookup(i) && v_op2->Lookup(i) )
v_result->Assign(i,
Fold(v_op1->Lookup(i),
v_op2->Lookup(i)));
else
v_result->Assign(i, 0);
// SetError("undefined element in vector operation");
}
Unref(v1);
Unref(v2);
return v_result;
}
if ( IsVector(Type()->Tag()) && (is_vec1 || is_vec2) )
{ // fold vector against scalar
VectorVal* vv = (is_vec1 ? v1 : v2)->AsVectorVal();
VectorVal* v_result = new VectorVal(Type()->AsVectorType());
for ( unsigned int i = 0; i < vv->Size(); ++i )
{
Val* vv_i = vv->Lookup(i);
if ( vv_i )
v_result->Assign(i,
is_vec1 ?
Fold(vv_i, v2) : Fold(v1, vv_i));
else
v_result->Assign(i, 0);
// SetError("Undefined element in vector operation");
}
Unref(v1);
Unref(v2);
return v_result;
}
// scalar op scalar
result = Fold(v1, v2);
Unref(v1);
Unref(v2);
return result;
}
int BinaryExpr::IsPure() const
{
return op1->IsPure() && op2->IsPure();
}
TraversalCode BinaryExpr::Traverse(TraversalCallback* cb) const
{
TraversalCode tc = cb->PreExpr(this);
HANDLE_TC_EXPR_PRE(tc);
tc = op1->Traverse(cb);
HANDLE_TC_EXPR_PRE(tc);
tc = op2->Traverse(cb);
HANDLE_TC_EXPR_PRE(tc);
tc = cb->PostExpr(this);
HANDLE_TC_EXPR_POST(tc);
}
void BinaryExpr::ExprDescribe(ODesc* d) const
{
op1->Describe(d);
d->SP();
if ( d->IsReadable() )
d->AddSP(expr_name(Tag()));
op2->Describe(d);
}
Val* BinaryExpr::Fold(Val* v1, Val* v2) const
{
InternalTypeTag it = v1->Type()->InternalType();
if ( it == TYPE_INTERNAL_STRING )
return StringFold(v1, v2);
if ( v1->Type()->Tag() == TYPE_PATTERN )
return PatternFold(v1, v2);
if ( v1->Type()->IsSet() )
return SetFold(v1, v2);
if ( it == TYPE_INTERNAL_ADDR )
return AddrFold(v1, v2);
if ( it == TYPE_INTERNAL_SUBNET )
return SubNetFold(v1, v2);
bro_int_t i1 = 0, i2 = 0, i3 = 0;
bro_uint_t u1 = 0, u2 = 0, u3 = 0;
double d1 = 0.0, d2 = 0.0, d3 = 0.0;
int is_integral = 0;
int is_unsigned = 0;
if ( it == TYPE_INTERNAL_INT )
{
i1 = v1->InternalInt();
i2 = v2->InternalInt();
++is_integral;
}
else if ( it == TYPE_INTERNAL_UNSIGNED )
{
u1 = v1->InternalUnsigned();
u2 = v2->InternalUnsigned();
++is_unsigned;
}
else if ( it == TYPE_INTERNAL_DOUBLE )
{
d1 = v1->InternalDouble();
d2 = v2->InternalDouble();
}
else
RuntimeErrorWithCallStack("bad type in BinaryExpr::Fold");
switch ( tag ) {
#define DO_INT_FOLD(op) \
if ( is_integral ) \
i3 = i1 op i2; \
else if ( is_unsigned ) \
u3 = u1 op u2; \
else \
RuntimeErrorWithCallStack("bad type in BinaryExpr::Fold");
#define DO_UINT_FOLD(op) \
if ( is_unsigned ) \
u3 = u1 op u2; \
else \
RuntimeErrorWithCallStack("bad type in BinaryExpr::Fold");
#define DO_FOLD(op) \
if ( is_integral ) \
i3 = i1 op i2; \
else if ( is_unsigned ) \
u3 = u1 op u2; \
else \
d3 = d1 op d2;
#define DO_INT_VAL_FOLD(op) \
if ( is_integral ) \
i3 = i1 op i2; \
else if ( is_unsigned ) \
i3 = u1 op u2; \
else \
i3 = d1 op d2;
case EXPR_ADD: DO_FOLD(+); break;
case EXPR_ADD_TO: DO_FOLD(+); break;
case EXPR_SUB: DO_FOLD(-); break;
case EXPR_REMOVE_FROM: DO_FOLD(-); break;
case EXPR_TIMES: DO_FOLD(*); break;
case EXPR_DIVIDE:
{
if ( is_integral )
{
if ( i2 == 0 )
RuntimeError("division by zero");
i3 = i1 / i2;
}
else if ( is_unsigned )
{
if ( u2 == 0 )
RuntimeError("division by zero");
u3 = u1 / u2;
}
else
{
if ( d2 == 0 )
RuntimeError("division by zero");
d3 = d1 / d2;
}
}
break;
case EXPR_MOD:
{
if ( is_integral )
{
if ( i2 == 0 )
RuntimeError("modulo by zero");
i3 = i1 % i2;
}
else if ( is_unsigned )
{
if ( u2 == 0 )
RuntimeError("modulo by zero");
u3 = u1 % u2;
}
else
RuntimeErrorWithCallStack("bad type in BinaryExpr::Fold");
}
break;
case EXPR_AND: DO_UINT_FOLD(&); break;
case EXPR_OR: DO_UINT_FOLD(|); break;
case EXPR_XOR: DO_UINT_FOLD(^); break;
case EXPR_AND_AND: DO_INT_FOLD(&&); break;
case EXPR_OR_OR: DO_INT_FOLD(||); break;
case EXPR_LT: DO_INT_VAL_FOLD(<); break;
case EXPR_LE: DO_INT_VAL_FOLD(<=); break;
case EXPR_EQ: DO_INT_VAL_FOLD(==); break;
case EXPR_NE: DO_INT_VAL_FOLD(!=); break;
case EXPR_GE: DO_INT_VAL_FOLD(>=); break;
case EXPR_GT: DO_INT_VAL_FOLD(>); break;
default:
BadTag("BinaryExpr::Fold", expr_name(tag));
}
BroType* ret_type = type;
if ( IsVector(ret_type->Tag()) )
ret_type = ret_type->YieldType();
if ( ret_type->Tag() == TYPE_INTERVAL )
return new IntervalVal(d3, 1.0);
else if ( ret_type->InternalType() == TYPE_INTERNAL_DOUBLE )
return new Val(d3, ret_type->Tag());
else if ( ret_type->InternalType() == TYPE_INTERNAL_UNSIGNED )
return val_mgr->GetCount(u3);
else if ( ret_type->Tag() == TYPE_BOOL )
return val_mgr->GetBool(i3);
else
return val_mgr->GetInt(i3);
}
Val* BinaryExpr::StringFold(Val* v1, Val* v2) const
{
const BroString* s1 = v1->AsString();
const BroString* s2 = v2->AsString();
int result = 0;
switch ( tag ) {
#undef DO_FOLD
#define DO_FOLD(sense) { result = Bstr_cmp(s1, s2) sense 0; break; }
case EXPR_LT: DO_FOLD(<)
case EXPR_LE: DO_FOLD(<=)
case EXPR_EQ: DO_FOLD(==)
case EXPR_NE: DO_FOLD(!=)
case EXPR_GE: DO_FOLD(>=)
case EXPR_GT: DO_FOLD(>)
case EXPR_ADD:
case EXPR_ADD_TO:
{
vector<const BroString*> strings;
strings.push_back(s1);
strings.push_back(s2);
return new StringVal(concatenate(strings));
}
default:
BadTag("BinaryExpr::StringFold", expr_name(tag));
}
return val_mgr->GetBool(result);
}
Val* BinaryExpr::PatternFold(Val* v1, Val* v2) const
{
const RE_Matcher* re1 = v1->AsPattern();
const RE_Matcher* re2 = v2->AsPattern();
if ( tag != EXPR_AND && tag != EXPR_OR )
BadTag("BinaryExpr::PatternFold");
RE_Matcher* res = tag == EXPR_AND ?
RE_Matcher_conjunction(re1, re2) :
RE_Matcher_disjunction(re1, re2);
return new PatternVal(res);
}
Val* BinaryExpr::SetFold(Val* v1, Val* v2) const
{
TableVal* tv1 = v1->AsTableVal();
TableVal* tv2 = v2->AsTableVal();
TableVal* result;
bool res = false;
switch ( tag ) {
case EXPR_AND:
return tv1->Intersect(tv2);
case EXPR_OR:
result = v1->Clone()->AsTableVal();
if ( ! tv2->AddTo(result, false, false) )
reporter->InternalError("set union failed to type check");
return result;
case EXPR_SUB:
result = v1->Clone()->AsTableVal();
if ( ! tv2->RemoveFrom(result) )
reporter->InternalError("set difference failed to type check");
return result;
case EXPR_EQ:
res = tv1->EqualTo(tv2);
break;
case EXPR_NE:
res = ! tv1->EqualTo(tv2);
break;
case EXPR_LT:
res = tv1->IsSubsetOf(tv2) && tv1->Size() < tv2->Size();
break;
case EXPR_LE:
res = tv1->IsSubsetOf(tv2);
break;
case EXPR_GE:
case EXPR_GT:
// These should't happen due to canonicalization.
reporter->InternalError("confusion over canonicalization in set comparison");
break;
default:
BadTag("BinaryExpr::SetFold", expr_name(tag));
return 0;
}
return val_mgr->GetBool(res);
}
Val* BinaryExpr::AddrFold(Val* v1, Val* v2) const
{
IPAddr a1 = v1->AsAddr();
IPAddr a2 = v2->AsAddr();
int result = 0;
switch ( tag ) {
case EXPR_LT:
result = a1 < a2;
break;
case EXPR_LE:
result = a1 < a2 || a1 == a2;
break;
case EXPR_EQ:
result = a1 == a2;
break;
case EXPR_NE:
result = a1 != a2;
break;
case EXPR_GE:
result = ! ( a1 < a2 );
break;
case EXPR_GT:
result = ( ! ( a1 < a2 ) ) && ( a1 != a2 );
break;
default:
BadTag("BinaryExpr::AddrFold", expr_name(tag));
}
return val_mgr->GetBool(result);
}
Val* BinaryExpr::SubNetFold(Val* v1, Val* v2) const
{
const IPPrefix& n1 = v1->AsSubNet();
const IPPrefix& n2 = v2->AsSubNet();
bool result = ( n1 == n2 ) ? true : false;
if ( tag == EXPR_NE )
result = ! result;
return val_mgr->GetBool(result);
}
void BinaryExpr::SwapOps()
{
// We could check here whether the operator is commutative.
Expr* t = op1;
op1 = op2;
op2 = t;
}
void BinaryExpr::PromoteOps(TypeTag t)
{
TypeTag bt1 = op1->Type()->Tag();
TypeTag bt2 = op2->Type()->Tag();
bool is_vec1 = IsVector(bt1);
bool is_vec2 = IsVector(bt2);
if ( is_vec1 )
bt1 = op1->Type()->AsVectorType()->YieldType()->Tag();
if ( is_vec2 )
bt2 = op2->Type()->AsVectorType()->YieldType()->Tag();
if ( (is_vec1 || is_vec2) && ! (is_vec1 && is_vec2) )
reporter->Warning("mixing vector and scalar operands is deprecated");
if ( bt1 != t )
op1 = new ArithCoerceExpr(op1, t);
if ( bt2 != t )
op2 = new ArithCoerceExpr(op2, t);
}
void BinaryExpr::PromoteType(TypeTag t, bool is_vector)
{
PromoteOps(t);
SetType(is_vector ? new VectorType(base_type(t)) : base_type(t));
}
CloneExpr::CloneExpr(Expr* arg_op) : UnaryExpr(EXPR_CLONE, arg_op)
{
if ( IsError() )
return;
BroType* t = op->Type();
SetType(t->Ref());
}
Val* CloneExpr::Eval(Frame* f) const
{
if ( IsError() )
return 0;
Val* v = op->Eval(f);
if ( ! v )
return 0;
Val* result = Fold(v);
Unref(v);
return result;
}
Val* CloneExpr::Fold(Val* v) const
{
return v->Clone();
}
IncrExpr::IncrExpr(BroExprTag arg_tag, Expr* arg_op)
: UnaryExpr(arg_tag, arg_op->MakeLvalue())
{
if ( IsError() )
return;
BroType* t = op->Type();
if ( IsVector(t->Tag()) )
{
if ( ! IsIntegral(t->AsVectorType()->YieldType()->Tag()) )
ExprError("vector elements must be integral for increment operator");
else
{
reporter->Warning("increment/decrement operations for vectors deprecated");
SetType(t->Ref());
}
}
else
{
if ( ! IsIntegral(t->Tag()) )
ExprError("requires an integral operand");
else
SetType(t->Ref());
}
}
Val* IncrExpr::DoSingleEval(Frame* f, Val* v) const
{
bro_int_t k = v->CoerceToInt();
if ( Tag() == EXPR_INCR )
++k;
else
{