src/cmd/5a/lex.c - go - Git at Google

 // Inferno utils/5a/lex.c
 // http://code.google.com/p/inferno-os/source/browse/utils/5a/lex.c
 //
 //	Copyright © 1994-1999 Lucent Technologies Inc.	All rights reserved.
 //	Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
 //	Portions Copyright © 1997-1999 Vita Nuova Limited
 //	Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
 //	Portions Copyright © 2004,2006 Bruce Ellis
 //	Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
 //	Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
 //	Portions Copyright © 2009 The Go Authors.  All rights reserved.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
 // in the Software without restriction, including without limitation the rights
 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 // copies of the Software, and to permit persons to whom the Software is
 // furnished to do so, subject to the following conditions:
 //
 // The above copyright notice and this permission notice shall be included in
 // all copies or substantial portions of the Software.
 //
 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.

 #define	EXTERN
 #include <u.h>
 #include <libc.h>
 #include "a.h"
 #include "y.tab.h"

 enum
 {
 	Plan9	= 1<<0,
 	Unix	= 1<<1,
 	Windows	= 1<<2,
 };

 int
 systemtype(int sys)
 {
 #ifdef _WIN32
 	return sys&Windows;
 #else
 	return sys&Plan9;
 #endif
 }

 void
 main(int argc, char *argv[])
 {
 	char *p;
 	int c;

 	thechar = '5';
 	thestring = "arm";

 	ensuresymb(NSYMB);
 	memset(debug, 0, sizeof(debug));
 	cinit();
 	outfile = 0;
 	setinclude(".");
 	ARGBEGIN {
 	default:
 		c = ARGC();
 		if(c >= 0 || c < sizeof(debug))
 			debug[c] = 1;
 		break;

 	case 'o':
 		outfile = ARGF();
 		break;

 	case 'D':
 		p = ARGF();
 		if(p) {
 			if (nDlist%8 == 0)
 				Dlist = allocn(Dlist, nDlist*sizeof(char *),
 					8*sizeof(char *));
 			Dlist[nDlist++] = p;
 		}
 		break;

 	case 'I':
 		p = ARGF();
 		setinclude(p);
 		break;
 	case 't':
 		thechar = 't';
 		thestring = "thumb";
 		break;
 	} ARGEND
 	if(*argv == 0) {
 		print("usage: %ca [-options] file.s\n", thechar);
 		errorexit();
 	}
 	if(argc > 1){
 		print("can't assemble multiple files\n");
 		errorexit();
 	}
 	if(assemble(argv[0]))
 		errorexit();
 	exits(0);
 }

 int
 assemble(char *file)
 {
 	char *ofile, *p;
 	int i, of;

 	ofile = alloc(strlen(file)+3); // +3 for .x\0 (x=thechar)
 	strcpy(ofile, file);
 	p = utfrrune(ofile, '/');
 	if(p) {
 		include[0] = ofile;
 		*p++ = 0;
 	} else
 		p = ofile;
 	if(outfile == 0) {
 		outfile = p;
 		if(outfile){
 			p = utfrrune(outfile, '.');
 			if(p)
 				if(p[1] == 's' && p[2] == 0)
 					p[0] = 0;
 			p = utfrune(outfile, 0);
 			p[0] = '.';
 			p[1] = thechar;
 			p[2] = 0;
 		} else
 			outfile = "/dev/null";
 	}

 	of = create(outfile, OWRITE, 0664);
 	if(of < 0) {
 		yyerror("%ca: cannot create %s", thechar, outfile);
 		errorexit();
 	}
 	Binit(&obuf, of, OWRITE);

 	pass = 1;
 	pinit(file);

 	Bprint(&obuf, "go object %s %s %s\n", getgoos(), thestring, getgoversion());

 	for(i=0; i<nDlist; i++)
 		dodefine(Dlist[i]);
 	yyparse();
 	if(nerrors) {
 		cclean();
 		return nerrors;
 	}

 	Bprint(&obuf, "\n!\n");

 	pass = 2;
 	outhist();
 	pinit(file);
 	for(i=0; i<nDlist; i++)
 		dodefine(Dlist[i]);
 	yyparse();
 	cclean();
 	return nerrors;
 }

 struct
 {
 	char	*name;
 	ushort	type;
 	ushort	value;
 } itab[] =
 {
 	"SP",		LSP,	D_AUTO,
 	"SB",		LSB,	D_EXTERN,
 	"FP",		LFP,	D_PARAM,
 	"PC",		LPC,	D_BRANCH,

 	"R",		LR,	0,
 	"R0",		LREG,	0,
 	"R1",		LREG,	1,
 	"R2",		LREG,	2,
 	"R3",		LREG,	3,
 	"R4",		LREG,	4,
 	"R5",		LREG,	5,
 	"R6",		LREG,	6,
 	"R7",		LREG,	7,
 	"R8",		LREG,	8,
 	"R9",		LREG,	9,
 	"R10",		LREG,	10,
 	"R11",		LREG,	11,
 	"R12",		LREG,	12,
 	"R13",		LREG,	13,
 	"R14",		LREG,	14,
 	"R15",		LREG,	15,

 	"F",		LF,	0,

 	"F0",		LFREG,	0,
 	"F1",		LFREG,	1,
 	"F2",		LFREG,	2,
 	"F3",		LFREG,	3,
 	"F4",		LFREG,	4,
 	"F5",		LFREG,	5,
 	"F6",		LFREG,	6,
 	"F7",		LFREG,	7,
 	"F8",		LFREG,	8,
 	"F9",		LFREG,	9,
 	"F10",		LFREG,	10,
 	"F11",		LFREG,	11,
 	"F12",		LFREG,	12,
 	"F13",		LFREG,	13,
 	"F14",		LFREG,	14,
 	"F15",		LFREG,	15,

 	"C",		LC,	0,

 	"C0",		LCREG,	0,
 	"C1",		LCREG,	1,
 	"C2",		LCREG,	2,
 	"C3",		LCREG,	3,
 	"C4",		LCREG,	4,
 	"C5",		LCREG,	5,
 	"C6",		LCREG,	6,
 	"C7",		LCREG,	7,
 	"C8",		LCREG,	8,
 	"C9",		LCREG,	9,
 	"C10",		LCREG,	10,
 	"C11",		LCREG,	11,
 	"C12",		LCREG,	12,
 	"C13",		LCREG,	13,
 	"C14",		LCREG,	14,
 	"C15",		LCREG,	15,

 	"CPSR",		LPSR,	0,
 	"SPSR",		LPSR,	1,

 	"FPSR",		LFCR,	0,
 	"FPCR",		LFCR,	1,

 	".EQ",		LCOND,	0,
 	".NE",		LCOND,	1,
 	".CS",		LCOND,	2,
 	".HS",		LCOND,	2,
 	".CC",		LCOND,	3,
 	".LO",		LCOND,	3,
 	".MI",		LCOND,	4,
 	".PL",		LCOND,	5,
 	".VS",		LCOND,	6,
 	".VC",		LCOND,	7,
 	".HI",		LCOND,	8,
 	".LS",		LCOND,	9,
 	".GE",		LCOND,	10,
 	".LT",		LCOND,	11,
 	".GT",		LCOND,	12,
 	".LE",		LCOND,	13,
 	".AL",		LCOND,	Always,

 	".U",		LS,	C_UBIT,
 	".S",		LS,	C_SBIT,
 	".W",		LS,	C_WBIT,
 	".P",		LS,	C_PBIT,
 	".PW",		LS,	C_WBIT|C_PBIT,
 	".WP",		LS,	C_WBIT|C_PBIT,

 	".F",		LS,	C_FBIT,

 	".IBW",		LS,	C_WBIT|C_PBIT|C_UBIT,
 	".IAW",		LS,	C_WBIT|C_UBIT,
 	".DBW",		LS,	C_WBIT|C_PBIT,
 	".DAW",		LS,	C_WBIT,
 	".IB",		LS,	C_PBIT|C_UBIT,
 	".IA",		LS,	C_UBIT,
 	".DB",		LS,	C_PBIT,
 	".DA",		LS,	0,

 	"@",		LAT,	0,

 	"AND",		LTYPE1,	AAND,
 	"EOR",		LTYPE1,	AEOR,
 	"SUB",		LTYPE1,	ASUB,
 	"RSB",		LTYPE1,	ARSB,
 	"ADD",		LTYPE1,	AADD,
 	"ADC",		LTYPE1,	AADC,
 	"SBC",		LTYPE1,	ASBC,
 	"RSC",		LTYPE1,	ARSC,
 	"ORR",		LTYPE1,	AORR,
 	"BIC",		LTYPE1,	ABIC,

 	"SLL",		LTYPE1,	ASLL,
 	"SRL",		LTYPE1,	ASRL,
 	"SRA",		LTYPE1,	ASRA,

 	"MUL",		LTYPE1, AMUL,
 	"MULA",		LTYPEN, AMULA,
 	"DIV",		LTYPE1,	ADIV,
 	"MOD",		LTYPE1,	AMOD,

 	"MULL",		LTYPEM, AMULL,
 	"MULAL",	LTYPEM, AMULAL,
 	"MULLU",	LTYPEM, AMULLU,
 	"MULALU",	LTYPEM, AMULALU,

 	"MVN",		LTYPE2, AMVN,	/* op2 ignored */

 	"MOVB",		LTYPE3, AMOVB,
 	"MOVBU",	LTYPE3, AMOVBU,
 	"MOVH",		LTYPE3, AMOVH,
 	"MOVHU",	LTYPE3, AMOVHU,
 	"MOVW",		LTYPE3, AMOVW,

 	"MOVD",		LTYPE3, AMOVD,
 	"MOVDF",		LTYPE3, AMOVDF,
 	"MOVDW",	LTYPE3, AMOVDW,
 	"MOVF",		LTYPE3, AMOVF,
 	"MOVFD",		LTYPE3, AMOVFD,
 	"MOVFW",		LTYPE3, AMOVFW,
 	"MOVWD",	LTYPE3, AMOVWD,
 	"MOVWF",		LTYPE3, AMOVWF,

 	"LDREX",		LTYPE3, ALDREX,
 	"LDREXD",		LTYPE3, ALDREXD,
 	"STREX",		LTYPE9, ASTREX,
 	"STREXD",		LTYPE9, ASTREXD,

 /*
 	"ABSF",		LTYPEI, AABSF,
 	"ABSD",		LTYPEI, AABSD,
 	"NEGF",		LTYPEI, ANEGF,
 	"NEGD",		LTYPEI, ANEGD,
 	"SQTF",		LTYPEI,	ASQTF,
 	"SQTD",		LTYPEI,	ASQTD,
 	"RNDF",		LTYPEI,	ARNDF,
 	"RNDD",		LTYPEI,	ARNDD,
 	"URDF",		LTYPEI,	AURDF,
 	"URDD",		LTYPEI,	AURDD,
 	"NRMF",		LTYPEI,	ANRMF,
 	"NRMD",		LTYPEI,	ANRMD,
 */

 	"SQRTF",	LTYPEI, ASQRTF,
 	"SQRTD",	LTYPEI, ASQRTD,
 	"CMPF",		LTYPEL, ACMPF,
 	"CMPD",		LTYPEL, ACMPD,
 	"ADDF",		LTYPEK,	AADDF,
 	"ADDD",		LTYPEK,	AADDD,
 	"SUBF",		LTYPEK,	ASUBF,
 	"SUBD",		LTYPEK,	ASUBD,
 	"MULF",		LTYPEK,	AMULF,
 	"MULD",		LTYPEK,	AMULD,
 	"DIVF",		LTYPEK,	ADIVF,
 	"DIVD",		LTYPEK,	ADIVD,

 	"B",		LTYPE4, AB,
 	"BL",		LTYPE4, ABL,
 	"BX",		LTYPEBX,	ABX,

 	"BEQ",		LTYPE5,	ABEQ,
 	"BNE",		LTYPE5,	ABNE,
 	"BCS",		LTYPE5,	ABCS,
 	"BHS",		LTYPE5,	ABHS,
 	"BCC",		LTYPE5,	ABCC,
 	"BLO",		LTYPE5,	ABLO,
 	"BMI",		LTYPE5,	ABMI,
 	"BPL",		LTYPE5,	ABPL,
 	"BVS",		LTYPE5,	ABVS,
 	"BVC",		LTYPE5,	ABVC,
 	"BHI",		LTYPE5,	ABHI,
 	"BLS",		LTYPE5,	ABLS,
 	"BGE",		LTYPE5,	ABGE,
 	"BLT",		LTYPE5,	ABLT,
 	"BGT",		LTYPE5,	ABGT,
 	"BLE",		LTYPE5,	ABLE,
 	"BCASE",	LTYPE5,	ABCASE,

 	"SWI",		LTYPE6, ASWI,

 	"CMP",		LTYPE7,	ACMP,
 	"TST",		LTYPE7,	ATST,
 	"TEQ",		LTYPE7,	ATEQ,
 	"CMN",		LTYPE7,	ACMN,

 	"MOVM",		LTYPE8, AMOVM,

 	"SWPBU",	LTYPE9, ASWPBU,
 	"SWPW",		LTYPE9, ASWPW,

 	"RET",		LTYPEA, ARET,
 	"RFE",		LTYPEA, ARFE,

 	"TEXT",		LTYPEB, ATEXT,
 	"GLOBL",	LTYPEB, AGLOBL,
 	"DATA",		LTYPEC, ADATA,
 	"CASE",		LTYPED, ACASE,
 	"END",		LTYPEE, AEND,
 	"WORD",		LTYPEH, AWORD,
 	"NOP",		LTYPEI, ANOP,

 	"MCR",		LTYPEJ, 0,
 	"MRC",		LTYPEJ, 1,
 	0
 };

 void
 cinit(void)
 {
 	Sym *s;
 	int i;

 	nullgen.sym = S;
 	nullgen.offset = 0;
 	nullgen.type = D_NONE;
 	nullgen.name = D_NONE;
 	nullgen.reg = NREG;
 	if(FPCHIP)
 		nullgen.dval = 0;
 	for(i=0; i<sizeof(nullgen.sval); i++)
 		nullgen.sval[i] = 0;

 	nerrors = 0;
 	iostack = I;
 	iofree = I;
 	peekc = IGN;
 	nhunk = 0;
 	for(i=0; i<NHASH; i++)
 		hash[i] = S;
 	for(i=0; itab[i].name; i++) {
 		s = slookup(itab[i].name);
 		s->type = itab[i].type;
 		s->value = itab[i].value;
 	}

 	pathname = allocn(pathname, 0, 100);
 	if(getwd(pathname, 99) == 0) {
 		pathname = allocn(pathname, 100, 900);
 		if(getwd(pathname, 999) == 0)
 			strcpy(pathname, "/???");
 	}
 }

 void
 syminit(Sym *s)
 {

 	s->type = LNAME;
 	s->value = 0;
 }

 int
 isreg(Gen *g)
 {

 	USED(g);
 	return 1;
 }

 void
 cclean(void)
 {

 	outcode(AEND, Always, &nullgen, NREG, &nullgen);
 	Bflush(&obuf);
 }

 void
 zname(char *n, int t, int s)
 {

 	Bputc(&obuf, ANAME);
 	Bputc(&obuf, t);	/* type */
 	Bputc(&obuf, s);	/* sym */
 	while(*n) {
 		Bputc(&obuf, *n);
 		n++;
 	}
 	Bputc(&obuf, 0);
 }

 void
 zaddr(Gen *a, int s)
 {
 	int32 l;
 	int i;
 	char *n;
 	Ieee e;

 	Bputc(&obuf, a->type);
 	Bputc(&obuf, a->reg);
 	Bputc(&obuf, s);
 	Bputc(&obuf, a->name);
 	switch(a->type) {
 	default:
 		print("unknown type %d\n", a->type);
 		exits("arg");

 	case D_NONE:
 	case D_REG:
 	case D_FREG:
 	case D_PSR:
 	case D_FPCR:
 		break;

 	case D_REGREG:
 		Bputc(&obuf, a->offset);
 		break;

 	case D_OREG:
 	case D_CONST:
 	case D_BRANCH:
 	case D_SHIFT:
 		l = a->offset;
 		Bputc(&obuf, l);
 		Bputc(&obuf, l>>8);
 		Bputc(&obuf, l>>16);
 		Bputc(&obuf, l>>24);
 		break;

 	case D_SCONST:
 		n = a->sval;
 		for(i=0; i<NSNAME; i++) {
 			Bputc(&obuf, *n);
 			n++;
 		}
 		break;

 	case D_FCONST:
 		ieeedtod(&e, a->dval);
 		Bputc(&obuf, e.l);
 		Bputc(&obuf, e.l>>8);
 		Bputc(&obuf, e.l>>16);
 		Bputc(&obuf, e.l>>24);
 		Bputc(&obuf, e.h);
 		Bputc(&obuf, e.h>>8);
 		Bputc(&obuf, e.h>>16);
 		Bputc(&obuf, e.h>>24);
 		break;
 	}
 }

 static int bcode[] =
 {
 	ABEQ,
 	ABNE,
 	ABCS,
 	ABCC,
 	ABMI,
 	ABPL,
 	ABVS,
 	ABVC,
 	ABHI,
 	ABLS,
 	ABGE,
 	ABLT,
 	ABGT,
 	ABLE,
 	AB,
 	ANOP,
 };

 void
 outcode(int a, int scond, Gen *g1, int reg, Gen *g2)
 {
 	int sf, st, t;
 	Sym *s;

 	/* hack to make B.NE etc. work: turn it into the corresponding conditional */
 	if(a == AB){
 		a = bcode[scond&0xf];
 		scond = (scond & ~0xf) | Always;
 	}

 	if(pass == 1)
 		goto out;
 jackpot:
 	sf = 0;
 	s = g1->sym;
 	while(s != S) {
 		sf = s->sym;
 		if(sf < 0 || sf >= NSYM)
 			sf = 0;
 		t = g1->name;
 		if(h[sf].type == t)
 		if(h[sf].sym == s)
 			break;
 		zname(s->name, t, sym);
 		s->sym = sym;
 		h[sym].sym = s;
 		h[sym].type = t;
 		sf = sym;
 		sym++;
 		if(sym >= NSYM)
 			sym = 1;
 		break;
 	}
 	st = 0;
 	s = g2->sym;
 	while(s != S) {
 		st = s->sym;
 		if(st < 0 || st >= NSYM)
 			st = 0;
 		t = g2->name;
 		if(h[st].type == t)
 		if(h[st].sym == s)
 			break;
 		zname(s->name, t, sym);
 		s->sym = sym;
 		h[sym].sym = s;
 		h[sym].type = t;
 		st = sym;
 		sym++;
 		if(sym >= NSYM)
 			sym = 1;
 		if(st == sf)
 			goto jackpot;
 		break;
 	}
 	Bputc(&obuf, a);
 	Bputc(&obuf, scond);
 	Bputc(&obuf, reg);
 	Bputc(&obuf, stmtline);
 	Bputc(&obuf, stmtline>>8);
 	Bputc(&obuf, stmtline>>16);
 	Bputc(&obuf, stmtline>>24);
 	zaddr(g1, sf);
 	zaddr(g2, st);

 out:
 	if(a != AGLOBL && a != ADATA)
 		pc++;
 }

 void
 outhist(void)
 {
 	Gen g;
 	Hist *h;
 	char *p, *q, *op, c;
 	int n;
  	char *tofree;
  	static int first = 1;
  	static char *goroot, *goroot_final;

  	if(first) {
  		// Decide whether we need to rewrite paths from $GOROOT to $GOROOT_FINAL.
  		first = 0;
  		goroot = getenv("GOROOT");
  		goroot_final = getenv("GOROOT_FINAL");
  		if(goroot == nil)
  			goroot = "";
  		if(goroot_final == nil)
  			goroot_final = goroot;
  		if(strcmp(goroot, goroot_final) == 0) {
  			goroot = nil;
  			goroot_final = nil;
  		}
  	}

  	tofree = nil;
 	g = nullgen;
 	c = '/';
 	for(h = hist; h != H; h = h->link) {
 		p = h->name;
  		if(p != nil && goroot != nil) {
  			n = strlen(goroot);
  			if(strncmp(p, goroot, strlen(goroot)) == 0 && p[n] == '/') {
  				tofree = smprint("%s%s", goroot_final, p+n);
  				p = tofree;
  			}
  		}
 		op = 0;
 		if(systemtype(Windows) && p && p[1] == ':'){
 			c = p[2];
 		} else if(p && p[0] != c && h->offset == 0 && pathname){
 			if(systemtype(Windows) && pathname[1] == ':') {
 				op = p;
 				p = pathname;
 				c = p[2];
 			} else if(pathname[0] == c){
 				op = p;
 				p = pathname;
 			}
 		}
 		while(p) {
 			q = strchr(p, c);
 			if(q) {
 				n = q-p;
 				if(n == 0){
 					n = 1;	/* leading "/" */
 					*p = '/';	/* don't emit "\" on windows */
 				}
 				q++;
 			} else {
 				n = strlen(p);
 				q = 0;
 			}
 			if(n) {
 				Bputc(&obuf, ANAME);
 				Bputc(&obuf, D_FILE);	/* type */
 				Bputc(&obuf, 1);	/* sym */
 				Bputc(&obuf, '<');
 				Bwrite(&obuf, p, n);
 				Bputc(&obuf, 0);
 			}
 			p = q;
 			if(p == 0 && op) {
 				p = op;
 				op = 0;
 			}
 		}
 		g.offset = h->offset;

 		Bputc(&obuf, AHISTORY);
 		Bputc(&obuf, Always);
 		Bputc(&obuf, 0);
 		Bputc(&obuf, h->line);
 		Bputc(&obuf, h->line>>8);
 		Bputc(&obuf, h->line>>16);
 		Bputc(&obuf, h->line>>24);
 		zaddr(&nullgen, 0);
 		zaddr(&g, 0);

 		if(tofree) {
 			free(tofree);
 			tofree = nil;
 		}
 	}
 }

 #include "../cc/lexbody"
 #include "../cc/macbody"
	// Inferno utils/5a/lex.c
	// http://code.google.com/p/inferno-os/source/browse/utils/5a/lex.c
	//
	// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
	// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
	// Portions Copyright © 1997-1999 Vita Nuova Limited
	// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
	// Portions Copyright © 2004,2006 Bruce Ellis
	// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
	// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
	// Portions Copyright © 2009 The Go Authors. All rights reserved.
	//
	// Permission is hereby granted, free of charge, to any person obtaining a copy
	// of this software and associated documentation files (the "Software"), to deal
	// in the Software without restriction, including without limitation the rights
	// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	// copies of the Software, and to permit persons to whom the Software is
	// furnished to do so, subject to the following conditions:
	//
	// The above copyright notice and this permission notice shall be included in
	// all copies or substantial portions of the Software.
	//
	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	// THE SOFTWARE.

	#define EXTERN
	#include <u.h>
	#include <libc.h>
	#include "a.h"
	#include "y.tab.h"

	enum
	{
	Plan9 = 1<<0,
	Unix = 1<<1,
	Windows = 1<<2,
	};

	int
	systemtype(int sys)
	{
	#ifdef _WIN32
	return sys&Windows;
	#else
	return sys&Plan9;
	#endif
	}

	void
	main(int argc, char *argv[])
	{
	char *p;
	int c;

	thechar = '5';
	thestring = "arm";

	ensuresymb(NSYMB);
	memset(debug, 0, sizeof(debug));
	cinit();
	outfile = 0;
	setinclude(".");
	ARGBEGIN {
	default:
	c = ARGC();
	if(c >= 0 \|\| c < sizeof(debug))
	debug[c] = 1;
	break;

	case 'o':
	outfile = ARGF();
	break;

	case 'D':
	p = ARGF();
	if(p) {
	if (nDlist%8 == 0)
	Dlist = allocn(Dlist, nDlistsizeof(char ),
	8sizeof(char ));
	Dlist[nDlist++] = p;
	}
	break;

	case 'I':
	p = ARGF();
	setinclude(p);
	break;
	case 't':
	thechar = 't';
	thestring = "thumb";
	break;
	} ARGEND
	if(*argv == 0) {
	print("usage: %ca [-options] file.s\n", thechar);
	errorexit();
	}
	if(argc > 1){
	print("can't assemble multiple files\n");
	errorexit();
	}
	if(assemble(argv[0]))
	errorexit();
	exits(0);
	}

	int
	assemble(char *file)
	{
	char ofile, p;
	int i, of;

	ofile = alloc(strlen(file)+3); // +3 for .x\0 (x=thechar)
	strcpy(ofile, file);
	p = utfrrune(ofile, '/');
	if(p) {
	include[0] = ofile;
	*p++ = 0;
	} else
	p = ofile;
	if(outfile == 0) {
	outfile = p;
	if(outfile){
	p = utfrrune(outfile, '.');
	if(p)
	if(p[1] == 's' && p[2] == 0)
	p[0] = 0;
	p = utfrune(outfile, 0);
	p[0] = '.';
	p[1] = thechar;
	p[2] = 0;
	} else
	outfile = "/dev/null";
	}

	of = create(outfile, OWRITE, 0664);
	if(of < 0) {
	yyerror("%ca: cannot create %s", thechar, outfile);
	errorexit();
	}
	Binit(&obuf, of, OWRITE);

	pass = 1;
	pinit(file);

	Bprint(&obuf, "go object %s %s %s\n", getgoos(), thestring, getgoversion());

	for(i=0; i<nDlist; i++)
	dodefine(Dlist[i]);
	yyparse();
	if(nerrors) {
	cclean();
	return nerrors;
	}

	Bprint(&obuf, "\n!\n");

	pass = 2;
	outhist();
	pinit(file);
	for(i=0; i<nDlist; i++)
	dodefine(Dlist[i]);
	yyparse();
	cclean();
	return nerrors;
	}

	struct
	{
	char *name;
	ushort type;
	ushort value;
	} itab[] =
	{
	"SP", LSP, D_AUTO,
	"SB", LSB, D_EXTERN,
	"FP", LFP, D_PARAM,
	"PC", LPC, D_BRANCH,

	"R", LR, 0,
	"R0", LREG, 0,
	"R1", LREG, 1,
	"R2", LREG, 2,
	"R3", LREG, 3,
	"R4", LREG, 4,
	"R5", LREG, 5,
	"R6", LREG, 6,
	"R7", LREG, 7,
	"R8", LREG, 8,
	"R9", LREG, 9,
	"R10", LREG, 10,
	"R11", LREG, 11,
	"R12", LREG, 12,
	"R13", LREG, 13,
	"R14", LREG, 14,
	"R15", LREG, 15,

	"F", LF, 0,

	"F0", LFREG, 0,
	"F1", LFREG, 1,
	"F2", LFREG, 2,
	"F3", LFREG, 3,
	"F4", LFREG, 4,
	"F5", LFREG, 5,
	"F6", LFREG, 6,
	"F7", LFREG, 7,
	"F8", LFREG, 8,
	"F9", LFREG, 9,
	"F10", LFREG, 10,
	"F11", LFREG, 11,
	"F12", LFREG, 12,
	"F13", LFREG, 13,
	"F14", LFREG, 14,
	"F15", LFREG, 15,

	"C", LC, 0,

	"C0", LCREG, 0,
	"C1", LCREG, 1,
	"C2", LCREG, 2,
	"C3", LCREG, 3,
	"C4", LCREG, 4,
	"C5", LCREG, 5,
	"C6", LCREG, 6,
	"C7", LCREG, 7,
	"C8", LCREG, 8,
	"C9", LCREG, 9,
	"C10", LCREG, 10,
	"C11", LCREG, 11,
	"C12", LCREG, 12,
	"C13", LCREG, 13,
	"C14", LCREG, 14,
	"C15", LCREG, 15,

	"CPSR", LPSR, 0,
	"SPSR", LPSR, 1,

	"FPSR", LFCR, 0,
	"FPCR", LFCR, 1,

	".EQ", LCOND, 0,
	".NE", LCOND, 1,
	".CS", LCOND, 2,
	".HS", LCOND, 2,
	".CC", LCOND, 3,
	".LO", LCOND, 3,
	".MI", LCOND, 4,
	".PL", LCOND, 5,
	".VS", LCOND, 6,
	".VC", LCOND, 7,
	".HI", LCOND, 8,
	".LS", LCOND, 9,
	".GE", LCOND, 10,
	".LT", LCOND, 11,
	".GT", LCOND, 12,
	".LE", LCOND, 13,
	".AL", LCOND, Always,

	".U", LS, C_UBIT,
	".S", LS, C_SBIT,
	".W", LS, C_WBIT,
	".P", LS, C_PBIT,
	".PW", LS, C_WBIT\|C_PBIT,
	".WP", LS, C_WBIT\|C_PBIT,

	".F", LS, C_FBIT,

	".IBW", LS, C_WBIT\|C_PBIT\|C_UBIT,
	".IAW", LS, C_WBIT\|C_UBIT,
	".DBW", LS, C_WBIT\|C_PBIT,
	".DAW", LS, C_WBIT,
	".IB", LS, C_PBIT\|C_UBIT,
	".IA", LS, C_UBIT,
	".DB", LS, C_PBIT,
	".DA", LS, 0,

	"@", LAT, 0,

	"AND", LTYPE1, AAND,
	"EOR", LTYPE1, AEOR,
	"SUB", LTYPE1, ASUB,
	"RSB", LTYPE1, ARSB,
	"ADD", LTYPE1, AADD,
	"ADC", LTYPE1, AADC,
	"SBC", LTYPE1, ASBC,
	"RSC", LTYPE1, ARSC,
	"ORR", LTYPE1, AORR,
	"BIC", LTYPE1, ABIC,

	"SLL", LTYPE1, ASLL,
	"SRL", LTYPE1, ASRL,
	"SRA", LTYPE1, ASRA,

	"MUL", LTYPE1, AMUL,
	"MULA", LTYPEN, AMULA,
	"DIV", LTYPE1, ADIV,
	"MOD", LTYPE1, AMOD,

	"MULL", LTYPEM, AMULL,
	"MULAL", LTYPEM, AMULAL,
	"MULLU", LTYPEM, AMULLU,
	"MULALU", LTYPEM, AMULALU,

	"MVN", LTYPE2, AMVN, /* op2 ignored */

	"MOVB", LTYPE3, AMOVB,
	"MOVBU", LTYPE3, AMOVBU,
	"MOVH", LTYPE3, AMOVH,
	"MOVHU", LTYPE3, AMOVHU,
	"MOVW", LTYPE3, AMOVW,

	"MOVD", LTYPE3, AMOVD,
	"MOVDF", LTYPE3, AMOVDF,
	"MOVDW", LTYPE3, AMOVDW,
	"MOVF", LTYPE3, AMOVF,
	"MOVFD", LTYPE3, AMOVFD,
	"MOVFW", LTYPE3, AMOVFW,
	"MOVWD", LTYPE3, AMOVWD,
	"MOVWF", LTYPE3, AMOVWF,

	"LDREX", LTYPE3, ALDREX,
	"LDREXD", LTYPE3, ALDREXD,
	"STREX", LTYPE9, ASTREX,
	"STREXD", LTYPE9, ASTREXD,

	/*
	"ABSF", LTYPEI, AABSF,
	"ABSD", LTYPEI, AABSD,
	"NEGF", LTYPEI, ANEGF,
	"NEGD", LTYPEI, ANEGD,
	"SQTF", LTYPEI, ASQTF,
	"SQTD", LTYPEI, ASQTD,
	"RNDF", LTYPEI, ARNDF,
	"RNDD", LTYPEI, ARNDD,
	"URDF", LTYPEI, AURDF,
	"URDD", LTYPEI, AURDD,
	"NRMF", LTYPEI, ANRMF,
	"NRMD", LTYPEI, ANRMD,
	*/

	"SQRTF", LTYPEI, ASQRTF,
	"SQRTD", LTYPEI, ASQRTD,
	"CMPF", LTYPEL, ACMPF,
	"CMPD", LTYPEL, ACMPD,
	"ADDF", LTYPEK, AADDF,
	"ADDD", LTYPEK, AADDD,
	"SUBF", LTYPEK, ASUBF,
	"SUBD", LTYPEK, ASUBD,
	"MULF", LTYPEK, AMULF,
	"MULD", LTYPEK, AMULD,
	"DIVF", LTYPEK, ADIVF,
	"DIVD", LTYPEK, ADIVD,

	"B", LTYPE4, AB,
	"BL", LTYPE4, ABL,
	"BX", LTYPEBX, ABX,

	"BEQ", LTYPE5, ABEQ,
	"BNE", LTYPE5, ABNE,
	"BCS", LTYPE5, ABCS,
	"BHS", LTYPE5, ABHS,
	"BCC", LTYPE5, ABCC,
	"BLO", LTYPE5, ABLO,
	"BMI", LTYPE5, ABMI,
	"BPL", LTYPE5, ABPL,
	"BVS", LTYPE5, ABVS,
	"BVC", LTYPE5, ABVC,
	"BHI", LTYPE5, ABHI,
	"BLS", LTYPE5, ABLS,
	"BGE", LTYPE5, ABGE,
	"BLT", LTYPE5, ABLT,
	"BGT", LTYPE5, ABGT,
	"BLE", LTYPE5, ABLE,
	"BCASE", LTYPE5, ABCASE,

	"SWI", LTYPE6, ASWI,

	"CMP", LTYPE7, ACMP,
	"TST", LTYPE7, ATST,
	"TEQ", LTYPE7, ATEQ,
	"CMN", LTYPE7, ACMN,

	"MOVM", LTYPE8, AMOVM,

	"SWPBU", LTYPE9, ASWPBU,
	"SWPW", LTYPE9, ASWPW,

	"RET", LTYPEA, ARET,
	"RFE", LTYPEA, ARFE,

	"TEXT", LTYPEB, ATEXT,
	"GLOBL", LTYPEB, AGLOBL,
	"DATA", LTYPEC, ADATA,
	"CASE", LTYPED, ACASE,
	"END", LTYPEE, AEND,
	"WORD", LTYPEH, AWORD,
	"NOP", LTYPEI, ANOP,

	"MCR", LTYPEJ, 0,
	"MRC", LTYPEJ, 1,
	0
	};

	void
	cinit(void)
	{
	Sym *s;
	int i;

	nullgen.sym = S;
	nullgen.offset = 0;
	nullgen.type = D_NONE;
	nullgen.name = D_NONE;
	nullgen.reg = NREG;
	if(FPCHIP)
	nullgen.dval = 0;
	for(i=0; i<sizeof(nullgen.sval); i++)
	nullgen.sval[i] = 0;

	nerrors = 0;
	iostack = I;
	iofree = I;
	peekc = IGN;
	nhunk = 0;
	for(i=0; i<NHASH; i++)
	hash[i] = S;
	for(i=0; itab[i].name; i++) {
	s = slookup(itab[i].name);
	s->type = itab[i].type;
	s->value = itab[i].value;
	}

	pathname = allocn(pathname, 0, 100);
	if(getwd(pathname, 99) == 0) {
	pathname = allocn(pathname, 100, 900);
	if(getwd(pathname, 999) == 0)
	strcpy(pathname, "/???");
	}
	}

	void
	syminit(Sym *s)
	{

	s->type = LNAME;
	s->value = 0;
	}

	int
	isreg(Gen *g)
	{

	USED(g);
	return 1;
	}

	void
	cclean(void)
	{

	outcode(AEND, Always, &nullgen, NREG, &nullgen);
	Bflush(&obuf);
	}

	void
	zname(char *n, int t, int s)
	{

	Bputc(&obuf, ANAME);
	Bputc(&obuf, t); /* type */
	Bputc(&obuf, s); /* sym */
	while(*n) {
	Bputc(&obuf, *n);
	n++;
	}
	Bputc(&obuf, 0);
	}

	void
	zaddr(Gen *a, int s)
	{
	int32 l;
	int i;
	char *n;
	Ieee e;

	Bputc(&obuf, a->type);
	Bputc(&obuf, a->reg);
	Bputc(&obuf, s);
	Bputc(&obuf, a->name);
	switch(a->type) {
	default:
	print("unknown type %d\n", a->type);
	exits("arg");

	case D_NONE:
	case D_REG:
	case D_FREG:
	case D_PSR:
	case D_FPCR:
	break;

	case D_REGREG:
	Bputc(&obuf, a->offset);
	break;

	case D_OREG:
	case D_CONST:
	case D_BRANCH:
	case D_SHIFT:
	l = a->offset;
	Bputc(&obuf, l);
	Bputc(&obuf, l>>8);
	Bputc(&obuf, l>>16);
	Bputc(&obuf, l>>24);
	break;

	case D_SCONST:
	n = a->sval;
	for(i=0; i<NSNAME; i++) {
	Bputc(&obuf, *n);
	n++;
	}
	break;

	case D_FCONST:
	ieeedtod(&e, a->dval);
	Bputc(&obuf, e.l);
	Bputc(&obuf, e.l>>8);
	Bputc(&obuf, e.l>>16);
	Bputc(&obuf, e.l>>24);
	Bputc(&obuf, e.h);
	Bputc(&obuf, e.h>>8);
	Bputc(&obuf, e.h>>16);
	Bputc(&obuf, e.h>>24);
	break;
	}
	}

	static int bcode[] =
	{
	ABEQ,
	ABNE,
	ABCS,
	ABCC,
	ABMI,
	ABPL,
	ABVS,
	ABVC,
	ABHI,
	ABLS,
	ABGE,
	ABLT,
	ABGT,
	ABLE,
	AB,
	ANOP,
	};

	void
	outcode(int a, int scond, Gen g1, int reg, Gen g2)
	{
	int sf, st, t;
	Sym *s;

	/* hack to make B.NE etc. work: turn it into the corresponding conditional */
	if(a == AB){
	a = bcode[scond&0xf];
	scond = (scond & ~0xf) \| Always;
	}

	if(pass == 1)
	goto out;
	jackpot:
	sf = 0;
	s = g1->sym;
	while(s != S) {
	sf = s->sym;
	if(sf < 0 \|\| sf >= NSYM)
	sf = 0;
	t = g1->name;
	if(h[sf].type == t)
	if(h[sf].sym == s)
	break;
	zname(s->name, t, sym);
	s->sym = sym;
	h[sym].sym = s;
	h[sym].type = t;
	sf = sym;
	sym++;
	if(sym >= NSYM)
	sym = 1;
	break;
	}
	st = 0;
	s = g2->sym;
	while(s != S) {
	st = s->sym;
	if(st < 0 \|\| st >= NSYM)
	st = 0;
	t = g2->name;
	if(h[st].type == t)
	if(h[st].sym == s)
	break;
	zname(s->name, t, sym);
	s->sym = sym;
	h[sym].sym = s;
	h[sym].type = t;
	st = sym;
	sym++;
	if(sym >= NSYM)
	sym = 1;
	if(st == sf)
	goto jackpot;
	break;
	}
	Bputc(&obuf, a);
	Bputc(&obuf, scond);
	Bputc(&obuf, reg);
	Bputc(&obuf, stmtline);
	Bputc(&obuf, stmtline>>8);
	Bputc(&obuf, stmtline>>16);
	Bputc(&obuf, stmtline>>24);
	zaddr(g1, sf);
	zaddr(g2, st);

	out:
	if(a != AGLOBL && a != ADATA)
	pc++;
	}

	void
	outhist(void)
	{
	Gen g;
	Hist *h;
	char p, q, *op, c;
	int n;
	char *tofree;
	static int first = 1;
	static char goroot, goroot_final;

	if(first) {
	// Decide whether we need to rewrite paths from $GOROOT to $GOROOT_FINAL.
	first = 0;
	goroot = getenv("GOROOT");
	goroot_final = getenv("GOROOT_FINAL");
	if(goroot == nil)
	goroot = "";
	if(goroot_final == nil)
	goroot_final = goroot;
	if(strcmp(goroot, goroot_final) == 0) {
	goroot = nil;
	goroot_final = nil;
	}
	}

	tofree = nil;
	g = nullgen;
	c = '/';
	for(h = hist; h != H; h = h->link) {
	p = h->name;
	if(p != nil && goroot != nil) {
	n = strlen(goroot);
	if(strncmp(p, goroot, strlen(goroot)) == 0 && p[n] == '/') {
	tofree = smprint("%s%s", goroot_final, p+n);
	p = tofree;
	}
	}
	op = 0;
	if(systemtype(Windows) && p && p[1] == ':'){
	c = p[2];
	} else if(p && p[0] != c && h->offset == 0 && pathname){
	if(systemtype(Windows) && pathname[1] == ':') {
	op = p;
	p = pathname;
	c = p[2];
	} else if(pathname[0] == c){
	op = p;
	p = pathname;
	}
	}
	while(p) {
	q = strchr(p, c);
	if(q) {
	n = q-p;
	if(n == 0){
	n = 1; /* leading "/" */
	p = '/'; / don't emit "\" on windows */
	}
	q++;
	} else {
	n = strlen(p);
	q = 0;
	}
	if(n) {
	Bputc(&obuf, ANAME);
	Bputc(&obuf, D_FILE); /* type */
	Bputc(&obuf, 1); /* sym */
	Bputc(&obuf, '<');
	Bwrite(&obuf, p, n);
	Bputc(&obuf, 0);
	}
	p = q;
	if(p == 0 && op) {
	p = op;
	op = 0;
	}
	}
	g.offset = h->offset;

	Bputc(&obuf, AHISTORY);
	Bputc(&obuf, Always);
	Bputc(&obuf, 0);
	Bputc(&obuf, h->line);
	Bputc(&obuf, h->line>>8);
	Bputc(&obuf, h->line>>16);
	Bputc(&obuf, h->line>>24);
	zaddr(&nullgen, 0);
	zaddr(&g, 0);

	if(tofree) {
	free(tofree);
	tofree = nil;
	}
	}
	}

	#include "../cc/lexbody"
	#include "../cc/macbody"