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zasm: remove SYM_CTX_PTR

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This commit is contained in:
Virgil Dupras 2019-07-22 16:34:40 -04:00
parent f4f91ebd79
commit b95f4c8c24
2 changed files with 13 additions and 18 deletions
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31
apps/zasm/symbol.asm
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@ -36,9 +36,7 @@
.equ SYM_LOC_VALUES SYM_NAMES+SYM_BUFSIZE .equ SYM_LOC_VALUES SYM_NAMES+SYM_BUFSIZE
.equ SYM_LOC_NAMES SYM_LOC_VALUES+SYM_LOC_MAXCOUNT*2 .equ SYM_LOC_NAMES SYM_LOC_VALUES+SYM_LOC_MAXCOUNT*2
; Pointer, in the value list, to the result of the last _symFind .equ SYM_RAMEND SYM_LOC_NAMES+SYM_LOC_BUFSIZE
.equ SYM_CTX_PTR SYM_LOC_NAMES+SYM_LOC_BUFSIZE
.equ SYM_RAMEND SYM_CTX_PTR+2
; *** Registries *** ; *** Registries ***
; A symbol registry is a 6 bytes record with points to names and values of ; A symbol registry is a 6 bytes record with points to names and values of
@ -149,12 +147,12 @@ symRegisterLocal:
; If successful, Z is set and A is the symbol index. Otherwise, Z is unset and ; If successful, Z is set and A is the symbol index. Otherwise, Z is unset and
; A is an error code (ERR_*). ; A is an error code (ERR_*).
symRegister: symRegister:
call _symFind
jr z, .alreadyThere
push hl ; --> lvl 1. it's the symbol to add push hl ; --> lvl 1. it's the symbol to add
push de ; --> lvl 2. it's our value. push de ; --> lvl 2. it's our value.
call _symFind
jr z, .alreadyThere
; First, let's get our strlen ; First, let's get our strlen
call strlen call strlen
@ -227,25 +225,24 @@ symRegister:
call zasmIsFirstPass call zasmIsFirstPass
jr z, .duplicateError jr z, .duplicateError
; Second pass. Don't error out, just update value ; Second pass. Don't error out, just update value, which DE points to.
push hl ; --> lvl 1 pop hl ; <-- lvl 2, the value to register
ld hl, (SYM_CTX_PTR)
ex de, hl
call writeHLinDE call writeHLinDE
pop hl ; <-- lvl 1 pop hl ; <-- lvl 1
cp a ; ensure Z cp a ; ensure Z
ret ret
.duplicateError: .duplicateError:
pop de ; <-- lvl 2
pop hl ; <-- lvl 1
ld a, ERR_DUPSYM ld a, ERR_DUPSYM
jp unsetZ ; return jp unsetZ ; return
; Assuming that IX points to a register context, find name HL in its names and ; Assuming that IX points to a registry, find name HL in its names and make DE
; make the context pointer point to the corresponding entry in its values. ; point to the corresponding entry in its values.
; If we find something, Z is set, otherwise unset. ; If we find something, Z is set, otherwise unset.
_symFind: _symFind:
push iy push iy
push hl push hl
push de
ex de, hl ; it's easier if HL is haystack and DE is ex de, hl ; it's easier if HL is haystack and DE is
; needle. ; needle.
@ -269,11 +266,10 @@ _symFind:
call unsetZ call unsetZ
jr .end jr .end
.match: .match:
push iy \ pop hl push iy \ pop de
ld (SYM_CTX_PTR), hl ; DE has our result
cp a ; ensure Z cp a ; ensure Z
.end: .end:
pop de
pop hl pop hl
pop iy pop iy
ret ret
@ -293,8 +289,7 @@ symFindVal:
call _symFind call _symFind
jr nz, .end jr nz, .end
; Found! let's fetch value ; Found! let's fetch value
; Return value that (SYM_CTX_PTR) is pointing at in DE. ; DE is pointing to our result
ld de, (SYM_CTX_PTR)
call intoDE call intoDE
.end: .end:
pop ix pop ix

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tools/emul/zasm/zasm.bin
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