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79e04189b0 | ||
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@ -76,6 +76,12 @@ forward-reference labels.
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However, they *cannot* forward-reference other constants.
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When defining a constant, if the symbol specified has already been defined, no
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error occur and the first value defined stays intact. This allows for "user
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override" of programs.
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It's also important to note that constants always override labels, regardless
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of declaration order.
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## Expressions
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@ -119,11 +125,7 @@ allowed. An included file cannot have an `.inc` directive.
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**.equ**: Binds a symbol named after the first parameter to the value of the
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expression written as the second parameter. Example:
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`.equ foo 0x42+'A'`
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If the symbol specified has already been defined, no error occur and
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the first value defined stays intact. This allows for "user override"
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of programs.
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`.equ foo 0x42+'A'`. See "Constants" above.
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**.fill**: Outputs the number of null bytes specified by its argument, an
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expression. Often used with `$` to fill our binary up to a certain
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@ -219,13 +219,13 @@ symFindVal:
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push ix
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call symIsLabelLocal
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jr z, .local
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; global. Let's try labels first, then consts
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; global. Let's try consts first, then symbols
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push hl ; --> lvl 1. we'll need it again if not found.
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ld ix, SYM_GLOBAL_REGISTRY
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ld ix, SYM_CONST_REGISTRY
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call _symFind
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pop hl ; <-- lvl 1
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jr z, .found
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ld ix, SYM_CONST_REGISTRY
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ld ix, SYM_GLOBAL_REGISTRY
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call _symFind
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jr nz, .end
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.found:
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Binary file not shown.
Binary file not shown.
@ -2,8 +2,11 @@ jp test
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.inc "core.asm"
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dummyLabel:
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testNum: .db 1
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.equ dummyLabel 0x42
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test:
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ld hl, 0xffff
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ld sp, hl
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@ -30,6 +33,13 @@ test:
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jp p, fail ; negative
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call nexttest
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; Test that .equ can override label
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ld a, 0x42
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ld hl, dummyLabel
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cp l
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jp nz, fail
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call nexttest
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; *** cpHLDE ***
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ld hl, 0x42
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ld de, 0x42
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