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%{
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdarg.h>
#include <string.h>
#include <ctype.h>
#include "type.h"
#include "ir.h"
#include "y.tab.h"
int yylex(void);
int lineno=1;
static enum state {
SOP,
STERM,
SPTR
} state = STERM;
static bool asm_mode = false;
__attribute__((format (printf, 1, 2)))
void pdebug(const char *format, ...);
#define RETS(val_) RETS_S(val_, yytext)
#define RETS_S(val_, str_) do {pdebug(#val_ ": %s\n", (str_)); yylval.id = strdup((str_)); return (val_);} while (0)
#define RET_TYPE(val_, ty_) do {pdebug(#val_ ": %s (" #ty_ ")\n", yytext); yylval.type = ty_; return (val_);} while (0)
#define RET_INSTYPE(val_, it_) do {pdebug(#val_ ": " #it_ "\n"); yylval.instype = (it_); return (val_);} while (0)
#define RET_REF(val_, r_) do {pdebug(#val_ ": " #r_ "\n"); yylval.ref = (r_); return (val_);} while (0)
#define RET(val_) do {pdebug(#val_ "\n"); return val_;} while (0)
%}
%option noinput nounput
LETTER [a-zA-Z]
DIGIT [0-9]
ID {LETTER}({LETTER}|{DIGIT}|_)*
DIGITS {DIGIT}{DIGIT}*
NUM -?{DIGITS}
/* An inclusive state; all other rules will still fire */
%s ASM_MODE
/* An exclusive state; no other rules will fire */
%x C_COMMENT
%%
{NUM} { state = SOP; RETS(NUM); }
int { state = SPTR; RET_TYPE(INT, type_int(16)); }
void { state = SPTR; RET_TYPE(VOID, type_void()); }
if { RET(IF); }
else { RET(ELSE); }
while { RET(WHILE); }
for { RET(FOR); }
return { state = STERM; RET(RETURN); }
asm { asm_mode = true; BEGIN(ASM_MODE); RET(ASM); }
{ID} {
state = SOP;
if (asm_mode) {
int len = strlen(yytext);
char name[len + 1];
for (int i = 0; i < len; i++) name[i] = tolower(yytext[i]);
name[len] = '\0';
if (strcmp(name, "add") == 0) RET_INSTYPE(ASMINS2, INS_ADD);
else if (strcmp(name, "sub") == 0) RET_INSTYPE(ASMINS2, INS_SUB);
else if (strcmp(name, "mul") == 0) RET_INSTYPE(ASMINS2, INS_MUL);
else if (strcmp(name, "div") == 0) RET_INSTYPE(ASMINS2, INS_DIV);
else if (strcmp(name, "mod") == 0) RET_INSTYPE(ASMINS2, INS_MOD);
else if (strcmp(name, "test") == 0) RET_INSTYPE(ASMINS2, INS_TEST);
else if (strcmp(name, "cmp") == 0) RET_INSTYPE(ASMINS2, INS_CMP);
else if (strcmp(name, "mov") == 0) RET_INSTYPE(ASMINS2, INS_MOV);
else if (strcmp(name, "neg") == 0) RET_INSTYPE(ASMINS1, INS_NEG);
else if (strcmp(name, "not") == 0) RET_INSTYPE(ASMINS1, INS_NOT);
else if (strcmp(name, "push") == 0) RET_INSTYPE(ASMINS1, INS_PUSH);
else if (strcmp(name, "pop") == 0) RET_INSTYPE(ASMINS1, INS_POP);
else if (strcmp(name, "hwi") == 0) RET_INSTYPE(ASMINS1, INS_HWI);
else if (strcmp(name, "ret") == 0) RET_INSTYPE(ASMINS0, INS_RET);
else if (strcmp(name, "brk") == 0) RET_INSTYPE(ASMINS0, INS_BRK);
else if (strcmp(name, "jmp") == 0) RET_INSTYPE(ASMINS_NAME, INS_JMP);
else if (strcmp(name, "call") == 0) RET_INSTYPE(ASMINS_NAME, INS_CALL);
else if (strcmp(name, "a") == 0) RET_REF(ASMREG, ref_reg(REG_A));
else if (strcmp(name, "b") == 0) RET_REF(ASMREG, ref_reg(REG_B));
else if (strcmp(name, "c") == 0) RET_REF(ASMREG, ref_reg(REG_C));
else if (strcmp(name, "d") == 0) RET_REF(ASMREG, ref_reg(REG_D));
else if (strcmp(name, "x") == 0) RET_REF(ASMREG, ref_reg(REG_X));
else if (strcmp(name, "y") == 0) RET_REF(ASMREG, ref_reg(REG_Y));
else if (strcmp(name, "sp") == 0) RET_REF(ASMREG, ref_reg(REG_SP));
else if (strcmp(name, "bp") == 0) RET_REF(ASMREG, ref_reg(REG_BP));
else RETS(ID);
} else {
RETS(ID);
}
}
<ASM_MODE>[+-] { pdebug("%c in ASM_MODE\n", yytext[0]); return yytext[0]; }
<ASM_MODE>@{ID} { pdebug("'%s'\n", yytext); RETS_S(ASMVARNAME, yytext + 1); }
"//"[^\n]* {}
"/*" { pdebug("C_COMMENT... "); fflush(stdout); BEGIN(C_COMMENT); }
<C_COMMENT>"*/" { pdebug("done\n"); BEGIN(INITIAL); }
<C_COMMENT>. {}
<C_COMMENT>\n { lineno++; if (asm_mode) RET(NEWLINE); }
\n { lineno++; if (asm_mode) RET(NEWLINE); }
[ \t]+ {}
"+" { state = STERM; RETS(ADDOP); }
[/%] { state = STERM; RETS(MULOP); }
"<"=?|">"=?|==|!= { state = STERM; RETS(RELOP); }
&&|"||" { state = STERM; RETS(BOOLOP); }
= { state = STERM; RET(ASSIGN); }
"!" { state = STERM; RET(NOT); }
"-" {
switch (state) {
case SOP: state = STERM; RETS(ADDOP);
case STERM: state = STERM; RET(NEGATE);
default: fprintf(stderr, "Unexpected '-'\n"); exit(1);
}
}
"*" {
switch (state) {
case SOP: state = STERM; RETS(MULOP);
case STERM: state = STERM; RET(DEREF);
case SPTR: state = SPTR; RET(PTR);
default: fprintf(stderr, "Unexpected '*'\n"); exit(1);
}
}
"&" {
switch (state) {
case SOP: fprintf(stderr, "Bit-and not implemented\n"); exit(1);
case STERM: state = STERM; RET(ADDROF);
default: fprintf(stderr, "Unexpected '&'\n"); exit(1);
}
}
")" { state = SOP; pdebug("')'\n"); return ')'; }
"}" { state = STERM; pdebug("'}'\n"); asm_mode = false; BEGIN(INITIAL); return '}'; }
. { pdebug(".: %c\n", yytext[0]); return yytext[0]; }
%%
void pdebug(const char *format, ...) {
(void)format;
#ifdef DEBUG
va_list ap;
va_start(ap, format);
vfprintf(stderr, format, ap);
va_end(ap);
#endif
}
/* vim:et:ts=4:sw=4
*/
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