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+ hooks for target-specific handling of explicit type conversions and

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as-nodes (required for JVM target: bit pattern reinterpretations
    have to be handled via conversion because of type safety reasons,
    and as-nodes will also have to be able to handled class<->dynarray
    checks/conversions)

git-svn-id: branches/jvmbackend@18375 -
This commit is contained in:
Jonas Maebe 2011-08-20 07:53:56 +00:00
parent f47689a5fe
commit 8643ab7905
1 changed files with 31 additions and 2 deletions
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33
compiler/ncnv.pas
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@ -88,6 +88,7 @@ interface
function typecheck_interface_to_variant : tnode;
function typecheck_array_2_dynarray : tnode;
protected
function target_specific_explicit_typeconv: tnode;virtual;
function first_int_to_int : tnode;virtual;
function first_cstring_to_pchar : tnode;virtual;
function first_cstring_to_int : tnode;virtual;
@ -190,6 +191,10 @@ interface
{ common functionality of as-nodes and is-nodes }
tasisnode = class(tbinarynode)
protected
{ if non-standard usage of as-nodes is possible, targets can override
this method and return true in case the conditions are fulfilled }
function target_specific_typecheck: boolean;virtual;
public
function pass_typecheck:tnode;override;
end;
@ -1568,6 +1573,12 @@ implementation
end;
function ttypeconvnode.target_specific_explicit_typeconv: tnode;
begin
result:=nil;
end;
procedure copyparasym(p:TObject;arg:pointer);
var
newparast : TSymtable absolute arg;
@ -1982,7 +1993,15 @@ implementation
(left.nodetype=derefn)
)
) then
CGMessage2(type_e_illegal_type_conversion,left.resultdef.typename,resultdef.typename);
CGMessage2(type_e_illegal_type_conversion,left.resultdef.typename,resultdef.typename)
else
begin
{ perform target-specific explicit typecast
checks }
result:=target_specific_explicit_typeconv;
if assigned(result) then
exit;
end;
end;
end
else
@ -3313,6 +3332,12 @@ implementation
TASNODE
*****************************************************************************}
function tasisnode.target_specific_typecheck: boolean;
begin
result:=false;
end;
function tasisnode.pass_typecheck: tnode;
var
hp : tnode;
@ -3327,7 +3352,11 @@ implementation
if codegenerror then
exit;
if (right.resultdef.typ=classrefdef) then
if target_specific_typecheck then
begin
// ok
end
else if (right.resultdef.typ=classrefdef) then
begin
{ left maybe an interface reference }
if is_interfacecom(left.resultdef) then