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/* valaintegerliteral.vala
*
* Copyright (C) 2006-2010 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;
/**
* Represents an integer literal in the source code.
*/
public class Vala.IntegerLiteral : Literal {
/**
* The literal value.
*/
public string value { get; private set; }
public string type_suffix { get; private set; }
/**
* Creates a new integer literal.
*
* @param i literal value
* @param source reference to source code
* @return newly created integer literal
*/
public IntegerLiteral (string i, SourceReference? source = null) {
value = i;
source_reference = source;
}
public override void accept (CodeVisitor visitor) {
visitor.visit_integer_literal (this);
visitor.visit_expression (this);
}
public override string to_string () {
return value;
}
public override bool is_pure () {
return true;
}
public override bool check (CodeContext context) {
if (checked) {
return !error;
}
checked = true;
int l = 0;
while (value.has_suffix ("l") || value.has_suffix ("L")) {
l++;
value = value.substring (0, value.length - 1);
}
bool u = false;
if (value.has_suffix ("u") || value.has_suffix ("U")) {
u = true;
value = value.substring (0, value.length - 1);
}
bool negative = value.has_prefix ("-");
if (negative && u) {
Report.error (source_reference, "unsigned integer literal cannot be negative");
error = true;
}
int64 n = 0LL;
uint64 un = 0ULL;
errno = 0;
if (value.has_prefix ("0b") || value.has_prefix ("0B")
|| value.has_prefix ("-0b") || value.has_prefix ("-0B")) {
string v;
if (negative) {
v = "-" + value.substring (3);
} else {
v = value.substring (2);
}
string unparsed;
if (negative) {
int64.try_parse (v, out n, out unparsed, 2);
value = n.to_string ();
} else {
uint64.try_parse (v, out un, out unparsed, 2);
value = un.to_string ();
}
if (unparsed != "") {
Report.error (source_reference, "invalid digit '%c' in binary literal", unparsed[0]);
error = true;
}
} else if ((value[0] == '0' && value.length > 1
&& (value[1] == 'o' || value[1] == 'O' || value[1].isdigit ()))
|| (value.has_prefix ("-0") && value.length > 3
&& (value[2] == 'o' || value[2] == 'O' || value[2].isdigit ()))) {
if (negative) {
if (!value[2].isdigit ()) {
value = "-0" + value.substring (3);
}
} else {
if (!value[1].isdigit ()) {
value = "0" + value.substring (2);
}
}
string unparsed;
if (negative) {
int64.try_parse (value, out n, out unparsed, 8);
} else {
uint64.try_parse (value, out un, out unparsed, 8);
}
if (unparsed != "") {
Report.error (source_reference, "invalid digit '%c' in octal literal", unparsed[0]);
error = true;
}
} else {
// hexademical and decimal literal
if (negative) {
n = int64.parse (value);
} else {
un = uint64.parse (value);
}
}
if (errno == ERANGE) {
Report.error (source_reference, "integer literal is too large for its type");
error = true;
} else if (errno == EINVAL) {
Report.error (source_reference, "invalid integer literal");
error = true;
}
if (un > int64.MAX) {
// value doesn't fit into signed 64-bit
u = true;
l = 2;
} else if (!negative) {
n = (int64) un;
}
if (!u && (n > int.MAX || n < int.MIN)) {
// value doesn't fit into signed 32-bit
l = 2;
} else if (u && n > uint.MAX) {
// value doesn't fit into unsigned 32-bit
l = 2;
}
string type_name;
if (l == 0) {
if (u) {
type_suffix = "U";
type_name = "uint";
} else {
type_suffix = "";
type_name = "int";
}
} else if (l == 1) {
if (u) {
type_suffix = "UL";
type_name = "ulong";
} else {
type_suffix = "L";
type_name = "long";
}
} else {
if (u) {
type_suffix = "ULL";
type_name = "uint64";
} else {
type_suffix = "LL";
type_name = "int64";
}
}
var st = (Struct) context.root.scope.lookup (type_name);
// ensure attributes are already processed
st.check (context);
value_type = new IntegerType (st, value, type_name);
return !error;
}
public override void emit (CodeGenerator codegen) {
codegen.visit_integer_literal (this);
codegen.visit_expression (this);
}
}
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