From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001
From: Erlang/OTP <otp@erlang.org>
Date: Fri, 20 Nov 2009 14:54:40 +0000
Subject: The R13B03 release.

---
 lib/hipe/rtl/hipe_rtl_exceptions.erl | 120 +++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 lib/hipe/rtl/hipe_rtl_exceptions.erl

(limited to 'lib/hipe/rtl/hipe_rtl_exceptions.erl')

diff --git a/lib/hipe/rtl/hipe_rtl_exceptions.erl b/lib/hipe/rtl/hipe_rtl_exceptions.erl
new file mode 100644
index 0000000000..879b84c0b0
--- /dev/null
+++ b/lib/hipe/rtl/hipe_rtl_exceptions.erl
@@ -0,0 +1,120 @@
+%% -*- erlang-indent-level: 2 -*-
+%%
+%% %CopyrightBegin%
+%% 
+%% Copyright Ericsson AB 2001-2009. All Rights Reserved.
+%% 
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%% 
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%% 
+%% %CopyrightEnd%
+%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Copyright (c) 2001 by Erik Johansson.  All Rights Reserved 
+%% ====================================================================
+%%  Filename : 	hipe_rtl_exceptions.erl
+%%  Module   :	hipe_rtl_exceptions
+%%  Purpose  :  
+%%  Notes    : 
+%%  History  :	* 2001-04-10 Erik Johansson (happi@it.uu.se): 
+%%               Created.
+%%  CVS      :
+%%      $Id$
+%% ====================================================================
+%%  Exports  :
+%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+-module(hipe_rtl_exceptions).
+
+-export([gen_fail/3, gen_begin_handler/3]).
+
+-include("../main/hipe.hrl").
+-include("hipe_literals.hrl").
+
+%% --------------------------------------------------------------------
+%% Handle the Icode instruction
+%% FAIL
+%%
+gen_fail(Class, Args, L) ->
+  case Args of
+    [Reason] ->
+      case Class of
+	exit -> 
+	  gen_exit(Reason, L);
+	throw ->
+	  gen_throw(Reason, L);
+	error ->
+	  gen_error(Reason, L)
+      end;
+    [Arg1,Arg2] ->
+      case Class of
+ 	error ->
+	  Reason = Arg1, ArgList = Arg2,
+	  gen_error(Reason, ArgList, L);
+	rethrow ->
+	  Exception = Arg1, Reason = Arg2,
+	  gen_rethrow(Exception, Reason, L)
+      end
+  end.
+
+%% --------------------------------------------------------------------
+%% Exception handler glue; interfaces between the runtime system's
+%% exception state and the Icode view of exception handling.
+
+gen_begin_handler(I, VarMap, ConstTab) ->
+  Ds = hipe_icode:begin_handler_dstlist(I),
+  {Vars, VarMap1} = hipe_rtl_varmap:ivs2rvs(Ds, VarMap),
+  [FTagVar,FValueVar,FTraceVar] = Vars,
+  {[hipe_rtl:mk_comment('begin_handler'),
+    hipe_rtl_arch:pcb_load(FValueVar, ?P_FVALUE),
+    hipe_rtl_arch:pcb_load(FTraceVar, ?P_FTRACE),
+    %% synthesized from P->freason by hipe_handle_exception()
+    hipe_rtl_arch:pcb_load(FTagVar, ?P_ARG0)
+   ], 
+   VarMap1, ConstTab}.
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%      
+%% Exceptions
+
+gen_exit(Reason, L) ->
+  gen_fail_call({erlang,exit,1}, [Reason], L).
+
+gen_throw(Reason, L) ->
+  gen_fail_call({erlang,throw,1}, [Reason], L).
+
+gen_error(Reason, L) ->
+  gen_fail_call({erlang,error,1}, [Reason], L).
+
+gen_error(Reason, ArgList, L) ->
+  gen_fail_call({erlang,error,2}, [Reason,ArgList], L).
+
+gen_rethrow(Exception, Reason, L) ->
+  gen_fail_call(rethrow, [Exception,Reason], L).
+
+%% Generic fail. We can't use 'enter' with a fail label (there can be no
+%% stack descriptor info for an enter), so for a non-nil fail label we
+%% generate a call followed by a dummy return.
+%%
+%% Update: The runtime system now interprets the return address of
+%% the BIF call in order to list the invoking MFA in the stack trace.
+%% Generating tailcalls here defeats that purpose, so we no longer do that.
+
+%%gen_fail_call(Fun, Args, []) ->
+%%  [hipe_rtl:mk_enter(Fun, Args, remote)];
+gen_fail_call(Fun, Args, L) ->
+  ContLbl = hipe_rtl:mk_new_label(),
+  Cont = hipe_rtl:label_name(ContLbl),
+  Zero = hipe_rtl:mk_imm(hipe_tagscheme:mk_fixnum(0)),
+  [hipe_rtl:mk_call([], Fun, Args, Cont, L, remote),
+   ContLbl,
+   hipe_rtl:mk_return([Zero])].
-- 
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