diff options
| -rw-r--r-- | usr.bin/oasm/parse.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/usr.bin/oasm/parse.c b/usr.bin/oasm/parse.c index 7c5b94c..6e7d2e6 100644 --- a/usr.bin/oasm/parse.c +++ b/usr.bin/oasm/parse.c @@ -95,10 +95,92 @@ static const char *tokstr[] = { [ TT_V7 ] = "v7", }; +static int +parse_reg(struct oasm_state *state, struct oasm_token *tok) +{ + const char *p; + + /* Valid instructions that go with regs */ + switch (state->last) { + case TT_MOV: + case TT_DEC: + case TT_INC: + state->last = tok->type; + break; + default: + p = tokstr[state->last]; + oasm_err("bad instruction '%s' for regop\n", p); + return -1; + } + + switch (tok->type) { + case TT_X0: + case TT_X1: + case TT_X2: + case TT_X3: + case TT_X4: + case TT_X5: + case TT_X6: + case TT_X7: + case TT_X8: + case TT_X9: + case TT_X10: + case TT_X11: + case TT_X12: + case TT_X13: + case TT_X14: + state->last = tok->type; + break; + default: + p = tokstr[tok->type]; + oasm_err("bad register %s\n", p); + return -1; + } + + return 0; +} + +static int +parse_tok(struct oasm_state *state, struct oasm_token *tok) +{ + const char *p; + int error; + + switch (tok->type) { + case TT_MOV: + state->last = tok->type; + break; + case TT_DEC: + state->last = tok->type; + break; + case TT_IMM: + p = tokstr[TT_MOV]; + if (state->last != TT_MOV) { + oasm_err("previous token must be %s\n", p); + return -1; + } + break; + default: + if (!tok->is_reg) { + oasm_err("syntax error\n"); + return -1; + } + + error = parse_reg(state, tok); + if (error < 0) { + return error; + } + break; + } + + return 0; +} + void parse_enter(struct oasm_state *state) { struct oasm_token tok; + const char *type, *raw; int error = 0; for (;;) { @@ -107,6 +189,14 @@ parse_enter(struct oasm_state *state) break; } + if (parse_tok(state, &tok) < 0) { + break; + } + + type = tokstr[tok.type]; + raw = tok.raw; + oasm_debug("got token type %s (%s)\n", type, raw); + if (tok.raw != NULL) { free(tok.raw); } |