[Coco] CC issue

[Walter Zambotti]

I found a small issue in both c.pass1/2 and o c_comp.

 

In the following demonstrative code (which is not meant to be logical):

 

main()

{

  int I;

  while(i++) { i--;}

#asm

  clra

  clrb

#endasm

  i = i + 1;

}

 

The asm code is incorrectly placed inside the while loop.

 

This occurs because the compiler is looking for a semicolon after the loop
block.  Which of course is not required and is tolerated.

However while it is looking for the semicolon if it comes across any
comments it outputs them immediately doing so before it has
finalised the output for the loop.

 

This issue does effect program execution.

 

The easy work around is to place an extraneous semicolon after the loop
block like so:

 

  while(i++) { i--;};

or

while(i++) i++;;

 

This forces the compiler to place the asm code after the loop as expected.

 

This occurs for any statement block that contains exit logic such as:

 

While, for, switch

 

This also affects C lines added as comments to the assembly.  The C comment
lines appear out of context to their respective asm.

 

This last issue does not effect program execution but makes it difficult to
use the assembly listing to debug your code.

 

I have traced through c.comp extensively and the fix would not be easy.

 

I did however manage to add a fix to c.prep so that it outputs a semicolon
before any asm code.  This seems to fix the
issue but would need extensive testing.

 

Walter