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e_old.e
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1999-06-05
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313 lines
-- This file is part of SmallEiffel The GNU Eiffel Compiler.
-- Copyright (C) 1994-98 LORIA - UHP - CRIN - INRIA - FRANCE
-- Dominique COLNET and Suzanne COLLIN - colnet@loria.fr
-- http://SmallEiffel.loria.fr
-- SmallEiffel is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the Free
-- Software Foundation; either version 2, or (at your option) any later
-- version. SmallEiffel 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 General Public License
-- for more details. You should have received a copy of the GNU General
-- Public License along with SmallEiffel; see the file COPYING. If not,
-- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-- Boston, MA 02111-1307, USA.
--
class E_OLD
--
-- To store instruction "old ..." usable in an ensure clause.
--
inherit EXPRESSION;
creation make
feature
expression: EXPRESSION;
feature {NONE}
current_type: TYPE;
local_c_name_memory: STRING;
-- The C name for the local variable.
id: INTEGER;
-- Used in Java byte code to gives a number to the
-- the extra local variable.
make(exp: like expression) is
require
exp /= Void
do
expression := exp;
ensure
expression = exp;
end;
feature
is_current: BOOLEAN is false;
is_writable: BOOLEAN is false;
is_static: BOOLEAN is false;
is_pre_computable: BOOLEAN is false;
is_manifest_string: BOOLEAN is false;
is_result: BOOLEAN is false;
is_void: BOOLEAN is false;
can_be_dropped: BOOLEAN is false;
c_simple: BOOLEAN is false;
isa_dca_inline_argument: INTEGER is 0;
static_result_base_class: BASE_CLASS is
do
Result := expression.static_result_base_class;
end;
static_value: INTEGER is
do
end;
dca_inline_argument(formal_arg_type: TYPE) is
do
end;
result_type: TYPE is
do
Result := expression.result_type;
end;
assertion_check(tag: CHARACTER) is
do
if vaol_check_memory.item = Void then
vaol_check_memory.set_item(Current);
else
eh.add_position(vaol_check_memory.item.start_position);
eh.append("Must not use old inside some old %
%expression (VAOL.2).");
eh.print_as_fatal_error;
end;
expression.assertion_check(tag);
vaol_check_memory.clear;
end;
afd_check is
do
expression.afd_check;
end;
to_runnable(ct: TYPE): like Current is
local
exp: like expression;
do
if current_type = Void then
current_type := ct;
exp := expression.to_runnable(ct);
if exp = Void then
error(start_position,"Bad old expression.");
else
expression := exp;
end;
Result := Current;
else
!!Result.make(expression);
Result := Result.to_runnable(ct);
end;
end;
start_position: POSITION is
do
Result := expression.start_position;
end;
pretty_print is
do
fmt.put_string("old ");
fmt.level_incr;
expression.pretty_print;
fmt.level_decr;
end;
print_as_target is
do
fmt.put_character('(');
pretty_print;
fmt.put_character(')');
fmt.put_character('.');
end;
bracketed_pretty_print is
do
fmt.put_character('(');
pretty_print;
fmt.put_character(')');
end;
short is
do
short_print.hook_or("old","old ");
expression.short;
end;
short_target is
do
bracketed_short;
short_print.a_dot;
end;
precedence: INTEGER is
do
Result := 11;
end;
frozen mapping_c_target(target_type: TYPE) is
do
compile_to_c;
end;
frozen mapping_c_arg(formal_arg_type: TYPE) is
do
compile_to_c;
end;
c_declare_for_old is
local
t: TYPE;
name: STRING;
p: POSITION;
do
name := local_c_name;
t := result_type.run_type;
tmp_string.clear;
t.c_type_for_argument_in(tmp_string);
tmp_string.extend(' ');
tmp_string.append(name);
tmp_string.extend('=');
t.c_initialize_in(tmp_string);
tmp_string.append(fz_00);
cpp.put_string(tmp_string);
if run_control.no_check then
c_frame_descriptor_locals.append("(void**)&");
c_frame_descriptor_locals.append(name);
c_frame_descriptor_locals.extend(',');
c_frame_descriptor_local_count.increment;
p := start_position;
c_frame_descriptor_format.append("old l");
p.line.append_in(c_frame_descriptor_format);
c_frame_descriptor_format.extend('c');
p.column.append_in(c_frame_descriptor_format);
c_frame_descriptor_format.append(p.base_class_name.to_string);
t.c_frame_descriptor;
end;
end;
compile_to_c_old is
local
t: TYPE;
do
t := result_type.run_type;
tmp_string.copy(local_c_name);
tmp_string.extend('=');
cpp.put_string(tmp_string);
expression.mapping_c_arg(t);
cpp.put_string(fz_00);
end;
collect_c_tmp is
do
end;
compile_to_c is
do
cpp.put_string(local_c_name);
end;
compile_to_jvm_old is
local
e: like expression;
rt: TYPE;
do
e := expression;
rt := e.result_type.run_type;
id := code_attribute.extra_local(rt);
e.compile_to_jvm;
rt.jvm_write_local(id);
end;
compile_to_jvm is
do
expression.result_type.jvm_push_local(id);
end;
compile_target_to_jvm is
do
standard_compile_target_to_jvm;
end;
jvm_branch_if_false: INTEGER is
do
Result := jvm_standard_branch_if_false;
end;
jvm_branch_if_true: INTEGER is
do
Result := jvm_standard_branch_if_true;
end;
compile_to_jvm_into(dest: TYPE): INTEGER is
do
Result := standard_compile_to_jvm_into(dest);
end;
jvm_assign is
do
end;
use_current: BOOLEAN is
do
Result := expression.use_current;
end;
feature {NONE}
local_c_name: STRING is
do
if local_c_name_memory = Void then
tmp_string.clear;
tmp_string.extend('o');
start_position.base_class.id.append_in(tmp_string);
tmp_string.extend('_');
start_position.line.append_in(tmp_string);
tmp_string.extend('_');
start_position.column.append_in(tmp_string);
local_c_name_memory := tmp_string.twin;
end;
Result := local_c_name_memory;
end;
tmp_string: STRING is
once
!!Result.make(12);
end;
vaol_check_memory: MEMO[E_OLD] is
once
!!Result;
end;
invariant
expression /= Void;
end -- E_OLD