Merge of commits 39916, 39925 and 39963

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r39916 | yury | 2018-10-12 14:43:17 +0000 (Fri, 12 Oct 2018) | 1 line

* Fixed checks for exceeding limit of locals space. Prevent range and overflow errors during the checks. Introduced the MaxLocalsSize constant which provides the maximum possible size of locals space (stack frame) depending of bitness of a cpu.
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--- Merging r39916 into '.':
U    compiler/tgobj.pas
U    compiler/globtype.pas
--- Recording mergeinfo for merge of r39916 into '.':
 U   .
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r39925 | pierre | 2018-10-13 12:00:31 +0000 (Sat, 13 Oct 2018) | 1 line

 Set MaxLocalsSize according to address size not register size
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--- Merging r39925 into '.':
G    compiler/globtype.pas
--- Recording mergeinfo for merge of r39925 into '.':
 G   .
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r39963 | yury | 2018-10-17 19:12:27 +0000 (Wed, 17 Oct 2018) | 1 line

* Fixed range check errors.
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--- Merging r39963 into '.':
G    compiler/tgobj.pas
--- Recording mergeinfo for merge of r39963 into '.':
 G   .

git-svn-id: branches/fixes_3_2@40834 -

compiler/globtype.pas

@@ -87,6 +87,14 @@ interface
        AIntBits = 8;
 {$endif cpu8bitalu}
 
+     { Maximum possible size of locals space (stack frame) }
+     Const
+{$if defined(cpu16bitaddr)}
+       MaxLocalsSize = High(PUint);
+{$else}
+       MaxLocalsSize = High(longint) - 15;
+{$endif}
+
      Type
        PAWord = ^AWord;
        PAInt = ^AInt;

compiler/tgobj.pas

@@ -274,6 +274,11 @@ implementation
          freetype:=Used2Free[temptype];
          if freetype=tt_none then
            internalerror(200208201);
+         if size>MaxLocalsSize then
+            begin
+              CGMessage(cg_e_localsize_too_big);
+              size:=0;  // Prevent further range check errors
+            end;
          size:=align(size,alignment);
          { First check the tmpfreelist, but not when
            we don't want to reuse an already allocated block }
@@ -417,29 +422,30 @@ implementation
             tl^.temptype:=temptype;
             tl^.def:=def;
 
-{$push}
-{$r-}
-{$warn 6018 off}
-{$warn 4044 off}
             { Extend the temp }
             if direction=-1 then
               begin
-                if qword(align(-lasttemp-alignmismatch,alignment))+size+alignmismatch>high(tl^.pos) then
-                  CGMessage(cg_e_localsize_too_big);
+                if Int64(align(-lasttemp-alignmismatch,alignment))+size+alignmismatch>MaxLocalsSize then
+                  begin
+                    CGMessage(cg_e_localsize_too_big);
+                    size:=0;  // Prevent further range check errors
+                  end;
                 lasttemp:=(-align(-lasttemp-alignmismatch,alignment))-size-alignmismatch;
                 tl^.pos:=lasttemp;
               end
             else
               begin
                 tl^.pos:=align(lasttemp+alignmismatch,alignment)-alignmismatch;
-                if qword(tl^.pos)+size>high(tl^.pos) then
-                  CGMessage(cg_e_localsize_too_big);
+                if Int64(tl^.pos)+size>MaxLocalsSize then
+                  begin
+                    CGMessage(cg_e_localsize_too_big);
+                    size:=0;  // Prevent further range check errors
+                  end;
                 lasttemp:=tl^.pos+size;
               end;
 {$ifdef EXTDEBUG}
          Comment(V_Note,'tgobj: (AllocTemp) lasttemp set to '+tostr(lasttemp));
 {$endif}
-{$pop}
             tl^.fini:=fini;
             tl^.alignment:=alignment;
             tl^.size:=size;