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Implement HIGH() and LOW() operators

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They work with the 16-bit registers BC, DE and HL, returning the
corresponding 8-bit register. HIGH() works with AF as well, returning A.

They also work with any kind of constant or symbol, generating a RPN
patch in the object file if the value is not defined at assembly time.

They work with macro arguments as well.

Signed-off-by: Antonio Niño Díaz <antonio_nd@outlook.com>
This commit is contained in:
Antonio Niño Díaz
2017-04-06 22:40:34 +01:00
parent bfcef01211
commit a6a47ff66d
5 changed files with 92 additions and 17 deletions
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31
src/asm/locallex.c
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@@ -60,30 +60,31 @@ struct sLexInitString localstrings[] = {
{"nz", T_CC_NZ},
{"z", T_CC_Z},
{"nc", T_CC_NC},
/* { "c", T_MODE_C }, */
/* { "c", T_TOKEN_C }, */
{"[bc]", T_MODE_BC_IND},
{"[de]", T_MODE_DE_IND},
{"[hl]", T_MODE_HL_IND},
{"[hl+]", T_MODE_HL_INDINC},
{"[hl-]", T_MODE_HL_INDDEC},
{"[hli]", T_MODE_HL_INDINC},
{"[hld]", T_MODE_HL_INDDEC},
{"hl", T_MODE_HL},
{"af", T_MODE_AF},
{"[bc]", T_MODE_BC_IND},
{"bc", T_MODE_BC},
{"[de]", T_MODE_DE_IND},
{"de", T_MODE_DE},
{"[sp]", T_MODE_SP_IND},
{"af", T_MODE_AF},
{"bc", T_MODE_BC},
{"de", T_MODE_DE},
{"hl", T_MODE_HL},
{"sp", T_MODE_SP},
{"a", T_MODE_A},
{"b", T_MODE_B},
{"[$ff00+c]", T_MODE_C_IND},
{"[c]", T_MODE_C_IND},
{"c", T_MODE_C},
{"d", T_MODE_D},
{"e", T_MODE_E},
{"h", T_MODE_H},
{"l", T_MODE_L},
{"[$ff00+c]", T_MODE_C_IND},
{"a", T_TOKEN_A},
{"b", T_TOKEN_B},
{"c", T_TOKEN_C},
{"d", T_TOKEN_D},
{"e", T_TOKEN_E},
{"h", T_TOKEN_H},
{"l", T_TOKEN_L},
{NULL, 0}
};