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/* valadovamemberaccessmodule.vala
*
* Copyright (C) 2006-2011 Jürg Billeter
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author:
* Jürg Billeter <j@bitron.ch>
*/
using GLib;
public abstract class Vala.DovaMemberAccessModule : DovaControlFlowModule {
public override void visit_member_access (MemberAccess expr) {
CCodeExpression pub_inst = null;
DataType base_type = null;
if (expr.inner != null) {
pub_inst = get_cvalue (expr.inner);
if (expr.inner.value_type != null) {
base_type = expr.inner.value_type;
}
}
if (expr.symbol_reference is Method) {
var m = (Method) expr.symbol_reference;
if (!(m is DynamicMethod)) {
generate_method_declaration (m, cfile);
if (!m.external && m.external_package) {
// internal VAPI methods
// only add them once per source file
if (add_generated_external_symbol (m)) {
visit_method (m);
}
}
}
if (expr.inner is BaseAccess) {
if (m.base_method != null) {
var base_class = (Class) m.base_method.parent_symbol;
set_cvalue (expr, new CCodeIdentifier ("%s_base_%s".printf (get_ccode_lower_case_name (base_class, null), m.name)));
return;
} else if (m.base_interface_method != null) {
var base_iface = (Interface) m.base_interface_method.parent_symbol;
set_cvalue (expr, new CCodeIdentifier ("%s_base_%s".printf (get_ccode_lower_case_name (base_iface, null), m.name)));
return;
}
}
if (m.base_method != null) {
if (!method_has_wrapper (m.base_method)) {
var inst = pub_inst;
if (expr.inner != null && !expr.inner.is_pure ()) {
// instance expression has side-effects
// store in temp. variable
var temp_var = get_temp_variable (expr.inner.value_type);
emit_temp_var (temp_var);
var ctemp = new CCodeIdentifier (temp_var.name);
inst = new CCodeAssignment (ctemp, pub_inst);
set_cvalue (expr.inner, ctemp);
}
var base_class = (Class) m.base_method.parent_symbol;
var vclass = new CCodeFunctionCall (new CCodeIdentifier ("%s_GET_CLASS".printf (get_ccode_upper_case_name (base_class, null))));
vclass.add_argument (inst);
set_cvalue (expr, new CCodeMemberAccess.pointer (vclass, m.name));
} else {
set_cvalue (expr, new CCodeIdentifier (get_ccode_name (m.base_method)));
}
} else if (m.base_interface_method != null) {
set_cvalue (expr, new CCodeIdentifier (get_ccode_name (m.base_interface_method)));
} else if (m is CreationMethod) {
set_cvalue (expr, new CCodeIdentifier (get_ccode_real_name (m)));
} else {
set_cvalue (expr, new CCodeIdentifier (get_ccode_name (m)));
}
} else if (expr.symbol_reference is ArrayLengthField) {
var array_type = (ArrayType) expr.inner.value_type;
if (array_type.fixed_length) {
var csizeof = new CCodeFunctionCall (new CCodeIdentifier ("sizeof"));
csizeof.add_argument (pub_inst);
var csizeofelement = new CCodeFunctionCall (new CCodeIdentifier ("sizeof"));
csizeofelement.add_argument (new CCodeElementAccess (pub_inst, new CCodeConstant ("0")));
set_cvalue (expr, new CCodeBinaryExpression (CCodeBinaryOperator.DIV, csizeof, csizeofelement));
} else {
set_cvalue (expr, new CCodeMemberAccess (pub_inst, "length"));
}
} else if (expr.symbol_reference is Field) {
var f = (Field) expr.symbol_reference;
expr.target_value = load_field (f, expr.inner != null ? expr.inner.target_value : null);
} else if (expr.symbol_reference is EnumValue) {
var ev = (EnumValue) expr.symbol_reference;
generate_enum_declaration ((Enum) ev.parent_symbol, cfile);
set_cvalue (expr, new CCodeConstant (get_ccode_name (ev)));
} else if (expr.symbol_reference is Constant) {
var c = (Constant) expr.symbol_reference;
generate_constant_declaration (c, cfile);
set_cvalue (expr, new CCodeIdentifier (get_ccode_name (c)));
} else if (expr.symbol_reference is Property) {
var prop = (Property) expr.symbol_reference;
if (!(prop is DynamicProperty)) {
generate_property_accessor_declaration (prop.get_accessor, cfile);
if (!prop.external && prop.external_package) {
// internal VAPI properties
// only add them once per source file
if (add_generated_external_symbol (prop)) {
visit_property (prop);
}
}
}
if (expr.inner is BaseAccess) {
if (prop.base_property != null) {
var base_class = (Class) prop.base_property.parent_symbol;
var vcast = new CCodeFunctionCall (new CCodeIdentifier ("%s_CLASS".printf (get_ccode_upper_case_name (base_class, null))));
vcast.add_argument (new CCodeIdentifier ("%s_parent_class".printf (get_ccode_lower_case_name (current_class, null))));
var ccall = new CCodeFunctionCall (new CCodeMemberAccess.pointer (vcast, "get_%s".printf (prop.name)));
ccall.add_argument (get_cvalue (expr.inner));
set_cvalue (expr, ccall);
return;
} else if (prop.base_interface_property != null) {
var base_iface = (Interface) prop.base_interface_property.parent_symbol;
string parent_iface_var = "%s_%s_parent_iface".printf (get_ccode_lower_case_name (current_class, null), get_ccode_lower_case_name (base_iface, null));
var ccall = new CCodeFunctionCall (new CCodeMemberAccess.pointer (new CCodeIdentifier (parent_iface_var), "get_%s".printf (prop.name)));
ccall.add_argument (get_cvalue (expr.inner));
set_cvalue (expr, ccall);
return;
}
}
var base_property = prop;
if (prop.base_property != null) {
base_property = prop.base_property;
} else if (prop.base_interface_property != null) {
base_property = prop.base_interface_property;
}
string getter_cname = get_ccode_name (base_property.get_accessor);
var ccall = new CCodeFunctionCall (new CCodeIdentifier (getter_cname));
if (prop.binding == MemberBinding.INSTANCE) {
ccall.add_argument (pub_inst);
}
set_cvalue (expr, ccall);
} else if (expr.symbol_reference is LocalVariable) {
var local = (LocalVariable) expr.symbol_reference;
expr.target_value = load_local (local);
} else if (expr.symbol_reference is Parameter) {
var p = (Parameter) expr.symbol_reference;
expr.target_value = load_parameter (p);
}
}
public TargetValue get_local_cvalue (LocalVariable local) {
var result = new DovaValue (local.variable_type);
if (local.is_result) {
// used in postconditions
result.cvalue = new CCodeIdentifier ("result");
} else if (local.captured) {
// captured variables are stored on the heap
var block = (Block) local.parent_symbol;
result.cvalue = new CCodeMemberAccess.pointer (get_variable_cexpression ("_data%d_".printf (get_block_id (block))), get_variable_cname (local.name));
} else {
result.cvalue = get_variable_cexpression (local.name);
}
return result;
}
public TargetValue get_parameter_cvalue (Parameter p) {
var result = new DovaValue (p.variable_type);
if (p.name == "this") {
if (current_method != null && current_method.coroutine) {
// use closure
result.cvalue = new CCodeMemberAccess.pointer (new CCodeIdentifier ("data"), "this");
} else {
var st = current_type_symbol as Struct;
if (st != null && !st.is_boolean_type () && !st.is_integer_type () && !st.is_floating_type () && (!st.is_simple_type () || current_method is CreationMethod)) {
result.cvalue = new CCodeIdentifier ("(*this)");
} else {
result.cvalue = new CCodeIdentifier ("this");
}
}
} else {
if (p.captured) {
// captured variables are stored on the heap
var block = p.parent_symbol as Block;
if (block == null) {
block = ((Method) p.parent_symbol).body;
}
result.cvalue = new CCodeMemberAccess.pointer (get_variable_cexpression ("_data%d_".printf (get_block_id (block))), get_variable_cname (p.name));
} else {
if (current_method != null && current_method.coroutine) {
// use closure
result.cvalue = get_variable_cexpression (p.name);
} else {
var type_as_struct = p.variable_type.data_type as Struct;
if (p.direction != ParameterDirection.IN
|| (type_as_struct != null && !type_as_struct.is_simple_type () && !p.variable_type.nullable)) {
if (p.variable_type is GenericType) {
result.cvalue = get_variable_cexpression (p.name);
} else {
result.cvalue = new CCodeIdentifier ("(*%s)".printf (get_variable_cname (p.name)));
}
} else {
// Property setters of non simple structs shall replace all occurences
// of the "value" formal parameter with a dereferencing version of that
// parameter.
if (current_property_accessor != null &&
current_property_accessor.writable &&
current_property_accessor.value_parameter == p &&
current_property_accessor.prop.property_type.is_real_struct_type ()) {
result.cvalue = new CCodeIdentifier ("(*value)");
} else {
result.cvalue = get_variable_cexpression (p.name);
}
}
}
}
}
return result;
}
public TargetValue get_field_cvalue (Field f, TargetValue? instance) {
var result = new DovaValue (f.variable_type);
if (f.binding == MemberBinding.INSTANCE) {
CCodeExpression pub_inst = null;
if (instance != null) {
pub_inst = get_cvalue_ (instance);
}
var instance_target_type = get_data_type_for_symbol ((TypeSymbol) f.parent_symbol);
var cl = instance_target_type.data_type as Class;
bool dova_priv = false;
if ((f.access == SymbolAccessibility.PRIVATE || f.access == SymbolAccessibility.INTERNAL)) {
dova_priv = true;
}
CCodeExpression inst;
if (dova_priv) {
var priv_call = new CCodeFunctionCall (new CCodeIdentifier ("%s_GET_PRIVATE".printf (get_ccode_upper_case_name (cl, null))));
priv_call.add_argument (pub_inst);
inst = priv_call;
} else {
inst = pub_inst;
}
if (instance_target_type.data_type.is_reference_type () || (instance != null && instance.value_type is PointerType)) {
result.cvalue = new CCodeMemberAccess.pointer (inst, get_ccode_name (f));
} else {
result.cvalue = new CCodeMemberAccess (inst, get_ccode_name (f));
}
} else {
generate_field_declaration (f, cfile);
result.cvalue = new CCodeIdentifier (get_ccode_name (f));
}
return result;
}
TargetValue load_variable (Variable variable, TargetValue value) {
return value;
}
public override TargetValue load_local (LocalVariable local) {
return load_variable (local, get_local_cvalue (local));
}
public override TargetValue load_parameter (Parameter param) {
return load_variable (param, get_parameter_cvalue (param));
}
public override TargetValue load_field (Field field, TargetValue? instance) {
return load_variable (field, get_field_cvalue (field, instance));
}
}
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