Handle inline where inputs are record fun-calls

Use DAE.RSUB() to handle general expressions. When doing inline of a
function call, we can use DAE.RSUB instead of failing; previously we
only handled component references passed to the call. Also added code
generation and simplifications for DAE.RSUB since it was only used
for MetaModelica previously.

This fixes some of the issues raised in ticket:4423.

Belonging to [master]:
  - #2076
  - OpenModelica/OpenModelica-testsuite#810

Compiler/FrontEnd/ExpressionSimplify.mo

@@ -282,6 +282,8 @@ algorithm
 
     case (DAE.CALL(),_) then (simplifyCall(inExp),options);
 
+    case (DAE.RSUB(),_) then (simplifyRSub(inExp),options);
+
     case (DAE.MATCHEXPRESSION(),_) then (simplifyMatch(inExp),options);
     case (DAE.UNBOX(),_) then (simplifyUnbox(inExp),options);
     case (DAE.BOX(),_) then (simplifyUnbox(inExp),options);
@@ -302,6 +304,18 @@ algorithm
   end match;
 end simplifyWork;
 
+protected function simplifyRSub
+  input output DAE.Exp e;
+algorithm
+  e := match e
+    local
+      DAE.ComponentRef cr;
+    case (DAE.RSUB(exp=DAE.CREF(componentRef=cr), ix=-1))
+      then DAE.CREF(ComponentReference.joinCrefs(cr, ComponentReference.makeCrefIdent(e.fieldName, e.ty, {})), e.ty);
+    else e;
+  end match;
+end simplifyRSub;
+
 protected function simplifyAsubExp
   input DAE.Exp origExp;
   input DAE.Exp inExp;

Compiler/FrontEnd/Inline.mo

@@ -1424,7 +1424,7 @@ public function replaceArgs
 algorithm
   (outExp,outTuple) := matchcontinue (inExp,inTuple)
     local
-      DAE.ComponentRef cref;
+      DAE.ComponentRef cref, firstCref;
       list<tuple<DAE.ComponentRef, DAE.Exp>> argmap;
       DAE.Exp e;
       Absyn.Path path;
@@ -1447,6 +1447,18 @@ algorithm
         BaseHashTable.hasKey(ComponentReference.crefFirstCref(cref),checkcr)
       then (inExp,(argmap,checkcr,false));
 
+    case (DAE.CREF(componentRef = cref),(argmap,checkcr,true))
+      algorithm
+        firstCref := ComponentReference.crefFirstCref(cref);
+        {} := ComponentReference.crefSubs(firstCref);
+        e := getExpFromArgMap(argmap,firstCref);
+        while not ComponentReference.crefIsIdent(cref) loop
+          cref := ComponentReference.crefRest(cref);
+          {} := ComponentReference.crefSubs(cref);
+          e := DAE.RSUB(e, -1, ComponentReference.crefFirstIdent(cref), ComponentReference.crefType(cref));
+        end while;
+      then (e,inTuple);
+
     case (DAE.CREF(componentRef = cref),(argmap,checkcr,true))
       equation
         getExpFromArgMap(argmap,ComponentReference.crefStripSubs(ComponentReference.crefFirstCref(cref)));

Compiler/Template/CodegenCFunctions.tpl

@@ -3699,6 +3699,7 @@ template expTypeFromExpFlag(Exp exp, Integer flag)
   case e as CONS(__)
   case e as LIST(__)
   case e as SIZE(__)     then expTypeFlag(typeof(e), flag)
+  case c as RSUB(ix=-1)       then expTypeFlag(c.ty, flag)
 
   case META_TUPLE(__)
   case META_OPTION(__)
@@ -6246,6 +6247,9 @@ template daeExpRsub(Exp inExp, Context context, Text &preExp,
  "Generates code for an tsub expression."
 ::=
   match inExp
+  case RSUB(ix=-1) then
+    let res = daeExp(exp, context, &preExp, &varDecls, &auxFunction)
+    '<%res%>._<%fieldName%>'
   case RSUB(__) then
     let res = daeExp(exp, context, &preExp, &varDecls, &auxFunction)
     let offset = intAdd(ix,1) // 1-based

Compiler/Template/CodegenCppCommon.tpl

@@ -973,10 +973,22 @@ template daeExp(Exp exp, Context context, Text &preExp /*BUFP*/, Text &varDecls
   case e as PARTEVALFUNCTION(__)then daeExpPartEvalFunction(e, context, &preExp, &varDecls, simCode , &extraFuncs, &extraFuncsDecl, extraFuncsNamespace, stateDerVectorName, useFlatArrayNotation)
   case e as BOX(__)             then daeExpBox(e, context, &preExp, &varDecls, simCode, &extraFuncs, &extraFuncsDecl, extraFuncsNamespace, stateDerVectorName, useFlatArrayNotation)
   case e as UNBOX(__)           then daeExpUnbox(e, context, &preExp, &varDecls, simCode, &extraFuncs, &extraFuncsDecl, extraFuncsNamespace, stateDerVectorName, useFlatArrayNotation)
+  case e as RSUB(__)            then daeExpRSub(e, context, &preExp, &varDecls, simCode, &extraFuncs, &extraFuncsDecl, extraFuncsNamespace, stateDerVectorName, useFlatArrayNotation)
 
   else error(sourceInfo(), 'Unknown exp:<%ExpressionDumpTpl.dumpExp(exp,"\"")%>')
 end daeExp;
 
+template daeExpRSub(Exp exp, Context context, Text &preExp, Text &varDecls, SimCode simCode, Text& extraFuncs, Text& extraFuncsDecl,
+                     Text extraFuncsNamespace, Text stateDerVectorName /*=__zDot*/, Boolean useFlatArrayNotation)
+ "Generates code for an tsub expression."
+::=
+  match exp
+  case RSUB(ix=-1) then
+    let res = daeExp(exp, context, &preExp, &varDecls, simCode, &extraFuncs, &extraFuncsDecl, extraFuncsNamespace, stateDerVectorName, useFlatArrayNotation)
+    '<%res%>.<%fieldName%>_'
+  case RSUB(__) then
+    error(sourceInfo(), '<%ExpressionDumpTpl.dumpExp(exp,"\"")%>: failed')
+end daeExpRSub;
 
 template daeExpRange(Exp exp, Context context, Text &preExp, Text &varDecls, SimCode simCode, Text& extraFuncs, Text& extraFuncsDecl,
                      Text extraFuncsNamespace, Text stateDerVectorName /*=__zDot*/, Boolean useFlatArrayNotation)