68 lines
1.8 KiB
Forth
68 lines
1.8 KiB
Forth
( Allow cross-compilation of z80c and icore.
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Include this file right before your cross compilation, then
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set XCURRENT to CURRENT and XOFF to H@.
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This redefines defining words to achieve cross compilation.
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The goal is two-fold:
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1. Add an offset to all word references in definitions.
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2. Don't shadow important words we need right now.
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Words overrides like ":", "IMMEDIATE" and "CODE" are not
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automatically shadowed to allow the harmless inclusion of
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this unit. This shadowing has to take place in your xcomp
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configuration.
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See example in /emul/forth/xcomp.fs
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Why limit ourselves to icore? Oh, I've tried cross-compiling
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the whole shebang. I tried. And failed. Too dynamic.
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)
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VARIABLE XCURRENT
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VARIABLE XOFF
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: XCON XCURRENT CURRENT* ! ;
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: XCOFF 0x02 RAM+ CURRENT* ! ;
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: (xentry) XCON (entry) XCOFF ;
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: XCODE XCON CODE XCOFF ;
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: XIMM XCON IMMEDIATE XCOFF ;
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: X:
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(xentry)
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( 0e == compiledWord )
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[ 0x0e LITN ] C,
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BEGIN
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WORD
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( cross compile CURRENT )
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XCURRENT @ SWAP ( w xcur w )
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_find ( w a f )
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IF
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( is word )
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( never supposed to encounter an IMMEDIATE in xdict )
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DUP IMMED? IF ABORT THEN
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( not an immed. drop backup w and write, with
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offset. )
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DUP XOFF @ > IF XOFF @ - THEN
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,
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ELSE ( w )
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( not found? it might be an immediate that isn't yet defined in our
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cross-compiled dict. It's alright, we can find-and-execute it. )
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( system CURRENT )
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0x02 RAM+ @ SWAP ( cur w )
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_find ( a f )
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IF
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( found. It *must* be an IMMED )
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DUP IMMED? NOT IF ABORT THEN
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EXECUTE
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ELSE
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( not found. maybe number )
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(parse*) @ EXECUTE LITN
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THEN
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THEN
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AGAIN
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;
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