-- This file is part of SmartEiffel The GNU Eiffel Compiler.
-- Copyright (C) 1994-2002 LORIA - INRIA - U.H.P. Nancy 1 - FRANCE
-- Dominique COLNET and Suzanne COLLIN - SmartEiffel@loria.fr
-- http://SmartEiffel.loria.fr
-- SmartEiffel 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. SmartEiffel 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 SmartEiffel; see the file COPYING. If not,
-- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-- Boston, MA 02111-1307, USA.
--
class ASSIGNMENT
--
-- For instruction like :
-- foo := bar
-- foo := bar + 1
--
--
inherit INSTRUCTION
creation make
feature
left_side: EXPRESSION
right_side: EXPRESSION
end_mark_comment: BOOLEAN is false
is_pre_computable: BOOLEAN is
local
call: CALL
rf6: RUN_FEATURE_6
do
if right_side.is_pre_computable then
call ?= right_side
if call /= Void then
rf6 ?= call.run_feature
Result := rf6 = Void
else
Result := true
end
end
end
afd_check is
do
right_side.afd_check
end
safety_check is
do
right_side.safety_check
end
collect_c_tmp is
do
right_side.collect_c_tmp
end
compile_to_c is
local
cast_t0: BOOLEAN
do
if ace.no_check then
cpp.put_trace_or_sedb_instruction(start_position)
end
if right_side.is_current then
if left_type.is_reference then
cast_t0 := right_type.is_reference
end
end
left_side.compile_to_c
cpp.put_character('=')
if cast_t0 then
cpp.put_string(once "((T0*)(")
elseif right_side.result_type.is_boolean then
cpp.put_string(once "((T6)(")
end
right_side.compile_to_c
if cast_t0 or else right_side.result_type.is_boolean then
cpp.put_string(once "))")
end
cpp.put_string(fz_00)
end
compile_to_jvm is
do
right_side.compile_to_jvm
left_side.jvm_assign
end
use_current: BOOLEAN is
do
Result := left_side.use_current
Result := Result or else right_side.use_current
end
stupid_switch(run_time_set: RUN_TIME_SET): BOOLEAN is
do
if left_side.stupid_switch(run_time_set) then
if right_side.stupid_switch(run_time_set) then
Result := true
end
end
end
right_type: E_TYPE is
do
Result := right_side.result_type
ensure
Result /= Void
end
left_type: E_TYPE is
do
Result := left_side.result_type
ensure
Result /= Void
end
start_position: POSITION is
do
Result := left_side.start_position
end
to_runnable(ct: E_TYPE): like Current is
local
l, r: EXPRESSION
do
l := left_side.to_runnable(ct)
if l = Void then
error_handler.add_position(left_side.start_position)
fatal_error(fz_blhsoa)
end
r := right_side.to_runnable(ct)
if r = Void then
error_handler.add_position(right_side.start_position)
fatal_error(fz_brhsoa)
end
if not r.result_type.is_a(l.result_type) then
error_handler.add_position(l.start_position)
fatal_error(" Bad assignment (VJAR).")
elseif r.result_type.is_reference then
separateness_consistency_rule_3_check(l, r)
end
if l = left_side and then r = right_side then
Result := implicit_conversion
else
create Result.make(l,r)
Result := Result.implicit_conversion
end
end
pretty_print is
do
pretty_print_assignment(left_side,once ":=",right_side)
end
feature {COMPOUND,INSTRUCTION_WITH_COMMENT}
verify_scoop(allowed: FORMAL_ARG_LIST) is
local
dummy: BOOLEAN
do
dummy := left_side.verify_scoop(allowed)
dummy := right_side.verify_scoop(allowed)
end
feature {ASSIGNMENT}
implicit_conversion: like Current is
local
left_run_type, right_run_type: E_TYPE; rhs: EXPRESSION
do
left_run_type := left_type.run_type
right_run_type := right_type.run_type
if right_side.is_void and then left_run_type.is_expanded then
error_handler.add_position(right_side.start_position)
error_handler.append("Void may not be assigned to an %
%expanded entity. Left hand side is ")
error_handler.add_type(left_type,".")
error_handler.print_as_error
end
rhs := assignment_handler.implicit_cast(right_side,left_run_type)
assignment_handler.assignment(rhs.start_position,
rhs.result_type,
left_run_type)
if rhs = right_side then
Result := Current
else
create Result.make(left_side,rhs)
end
end
feature {NONE}
separateness_consistency_rule_3_check(l, r: EXPRESSION) is
local
c: CALL
do
c ?= r
if c /= Void then
if c.target.result_type.is_separate
and then not c.target.is_current
and then not l.result_type.is_separate
then
error_handler.add_position(l.start_position)
error_handler.append(
"Separateness Consistency Rule violated%N(OOSC2 p. %
%1025): invalid assignment. (See the 2 following %
%messages for more details.)")
error_handler.print_as_error
error_handler.add_position(c.start_position)
error_handler.append("This call is separate (%
%because the target is separate).")
error_handler.print_as_error
error_handler.add_position(l.start_position)
error_handler.append("In this situation, the type %
%of the left-hand-side must be %
%separate too.")
error_handler.print_as_fatal_error
end
end
end
debug_info: STRING
make(ls: like left_side; rs: like right_side) is
require
ls.is_writable
not ls.start_position.is_unknown
rs /= Void
do
left_side := ls
right_side := rs
debug
create debug_info.make(64)
left_side.start_position.append_in(debug_info)
end
ensure
left_side = ls
right_side = rs
end
invariant
left_side.is_writable
right_side /= Void
end -- ASSIGNMENT