// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

#include	<u.h>
#include	<libc.h>
#include	<bio.h>

#undef OAPPEND

// avoid <ctype.h>
#undef isblank
#define isblank goisblank

#ifndef	EXTERN
#define	EXTERN	extern
#endif

#undef	BUFSIZ

enum
{
	NHUNK		= 50000,
	BUFSIZ		= 8192,
	NSYMB		= 500,
	NHASH		= 1024,
	STRINGSZ	= 200,
	YYMAXDEPTH	= 500,
	MAXALIGN	= 7,
	UINF		= 100,
	HISTSZ		= 10,

	PRIME1		= 3,

	AUNK		= 100,

	// these values are known by runtime
	AMEM		= 0,
	ANOEQ,
	ASTRING,
	AINTER,
	ANILINTER,
	AMEMWORD,

	BADWIDTH	= -1000000000,
	MAXWIDTH	= 1<<30
};

/*
 * note this is the representation
 * of the compilers string literals,
 * it is not the runtime representation
 */
typedef	struct	Strlit	Strlit;
struct	Strlit
{
	int32	len;
	char	s[3];	// variable
};

/*
 * note this is the runtime representation
 * of hashmap iterator. it is probably
 * insafe to use it this way, but it puts
 * all the changes in one place.
 * only flag is referenced from go.
 * actual placement does not matter as long
 * as the size is >= actual size.
 */
typedef	struct	Hiter	Hiter;
struct	Hiter
{
	uchar	data[8];		// return val from next
	int32	elemsize;		// size of elements in table */
	int32	changes;		// number of changes observed last time */
	int32	i;			// stack pointer in subtable_state */
	uchar	last[8];		// last hash value returned */
	uchar	h[8];			// the hash table */
	struct
	{
		uchar	sub[8];		// pointer into subtable */
		uchar	start[8];	// pointer into start of subtable */
		uchar	end[8];		// pointer into end of subtable */
		uchar	pad[8];
	} sub[4];
};

enum
{
	Mpscale	= 29,		// safely smaller than bits in a long
	Mpprec	= 16,		// Mpscale*Mpprec is max number of bits
	Mpnorm	= Mpprec - 1,	// significant words in a normalized float
	Mpbase	= 1L << Mpscale,
	Mpsign	= Mpbase >> 1,
	Mpmask	= Mpbase - 1,
	Mpdebug	= 0,
};

typedef	struct	Mpint	Mpint;
struct	Mpint
{
	long	a[Mpprec];
	uchar	neg;
	uchar	ovf;
};

typedef	struct	Mpflt	Mpflt;
struct	Mpflt
{
	Mpint	val;
	short	exp;
};

typedef	struct	Mpcplx	Mpcplx;
struct	Mpcplx
{
	Mpflt	real;
	Mpflt	imag;
};

typedef	struct	Val	Val;
struct	Val
{
	short	ctype;
	union
	{
		short	reg;		// OREGISTER
		short	bval;		// bool value CTBOOL
		Mpint*	xval;		// int CTINT
		Mpflt*	fval;		// float CTFLT
		Mpcplx*	cval;		// float CTCPLX
		Strlit*	sval;		// string CTSTR
	} u;
};

typedef	struct	Pkg Pkg;
typedef	struct	Sym	Sym;
typedef	struct	Node	Node;
typedef	struct	NodeList	NodeList;
typedef	struct	Type	Type;
typedef	struct	Label	Label;

struct	Type
{
	uchar	etype;
	uchar	chan;
	uchar	recur;		// to detect loops
	uchar	trecur;		// to detect loops
	uchar	printed;
	uchar	embedded;	// TFIELD embedded type
	uchar	siggen;
	uchar	funarg;
	uchar	copyany;
	uchar	local;		// created in this file
	uchar	deferwidth;
	uchar	broke;
	uchar	isddd;	// TFIELD is ... argument
	uchar	align;

	Node*	nod;		// canonical OTYPE node
	Type*	orig;		// original type (type literal or predefined type)
	int		lineno;

	// TFUNCT
	uchar	thistuple;
	uchar	outtuple;
	uchar	intuple;
	uchar	outnamed;

	Type*	method;
	Type*	xmethod;

	Sym*	sym;
	int32	vargen;		// unique name for OTYPE/ONAME

	Node*	nname;
	vlong	argwid;

	// most nodes
	Type*	type;
	vlong	width;		// offset in TFIELD, width in all others

	// TFIELD
	Type*	down;		// also used in TMAP
	Strlit*	note;		// literal string annotation

	// TARRAY
	int32	bound;		// negative is dynamic array

	int32	maplineno;	// first use of TFORW as map key
	int32	embedlineno;	// first use of TFORW as embedded type
};
#define	T	((Type*)0)

struct	Node
{
	uchar	op;
	uchar	ullman;		// sethi/ullman number
	uchar	addable;	// type of addressability - 0 is not addressable
	uchar	trecur;		// to detect loops
	uchar	etype;		// op for OASOP, etype for OTYPE, exclam for export
	uchar	class;		// PPARAM, PAUTO, PEXTERN, etc
	uchar	method;		// OCALLMETH name
	uchar	embedded;	// ODCLFIELD embedded type
	uchar	colas;		// OAS resulting from :=
	uchar	diag;		// already printed error about this
	uchar	noescape;	// ONAME never move to heap
	uchar	funcdepth;
	uchar	builtin;	// built-in name, like len or close
	uchar	walkdef;
	uchar	typecheck;
	uchar	local;
	uchar	initorder;
	uchar	dodata;		// compile literal assignment as data statement
	uchar	used;
	uchar	isddd;
	uchar	pun;		// don't registerize variable ONAME
	uchar	readonly;
	uchar	implicit;	// don't show in printout

	// most nodes
	Node*	left;
	Node*	right;
	Type*	type;
	Type*	realtype;	// as determined by typecheck
	NodeList*	list;
	NodeList*	rlist;
	Node*	orig;		// original form, for printing, and tracking copies of ONAMEs

	// for-body
	NodeList*	ninit;
	Node*	ntest;
	Node*	nincr;
	NodeList*	nbody;

	// if-body
	NodeList*	nelse;

	// cases
	Node*	ncase;

	// func
	Node*	nname;
	Node*	shortname;
	NodeList*	enter;
	NodeList*	exit;
	NodeList*	cvars;	// closure params
	NodeList*	dcl;	// autodcl for this func/closure

	// OLITERAL/OREGISTER
	Val	val;

	// ONAME
	Node*	ntype;
	Node*	defn;
	Node*	pack;	// real package for import . names
	Node*	curfn;	// function for local variables

	// ONAME func param with PHEAP
	Node*	heapaddr;	// temp holding heap address of param
	Node*	stackparam;	// OPARAM node referring to stack copy of param
	Node*	alloc;	// allocation call

	// ONAME closure param with PPARAMREF
	Node*	outer;	// outer PPARAMREF in nested closure
	Node*	closure;	// ONAME/PHEAP <-> ONAME/PPARAMREF

	// OPACK
	Pkg*	pkg;

	Sym*	sym;		// various
	int32	vargen;		// unique name for OTYPE/ONAME
	int32	lineno;
	int32	endlineno;
	vlong	xoffset;
	int32	stkdelta;	// offset added by stack frame compaction phase.
	int32	ostk;
	int32	iota;
};
#define	N	((Node*)0)
EXTERN	int32	walkgen;

struct	NodeList
{
	Node*	n;
	NodeList*	next;
	NodeList*	end;
};

enum
{
	SymExport	= 1<<0,
	SymPackage	= 1<<1,
	SymExported	= 1<<2,
	SymUniq		= 1<<3,
	SymSiggen	= 1<<4,
};

struct	Sym
{
	ushort	lexical;
	uchar	flags;
	uchar	sym;		// huffman encoding in object file
	Sym*	link;

	// saved and restored by dcopy
	Pkg*	pkg;
	char*	name;		// variable name
	Node*	def;		// definition: ONAME OTYPE OPACK or OLITERAL
	Label*	label;	// corresponding label (ephemeral)
	int32	block;		// blocknumber to catch redeclaration
	int32	lastlineno;	// last declaration for diagnostic
};
#define	S	((Sym*)0)

EXTERN	Sym*	dclstack;

struct	Pkg
{
	char*	name;
	Strlit*	path;
	Sym*	pathsym;
	char*	prefix;
	Pkg*	link;
	char	exported;	// import line written in export data
	char	direct;	// imported directly
};

typedef	struct	Iter	Iter;
struct	Iter
{
	int	done;
	Type*	tfunc;
	Type*	t;
	Node**	an;
	Node*	n;
};

typedef	struct	Hist	Hist;
struct	Hist
{
	Hist*	link;
	char*	name;
	int32	line;
	int32	offset;
};
#define	H	((Hist*)0)

enum
{
	OXXX,

	// names
	ONAME,
	ONONAME,
	OTYPE,
	OPACK,
	OLITERAL,

	// exprs
	OADD, OSUB, OOR, OXOR, OADDSTR,
	OADDR,
	OANDAND,
	OAPPEND,
	OARRAY,
	OARRAYBYTESTR, OARRAYRUNESTR,
	OSTRARRAYBYTE, OSTRARRAYRUNE,
	OAS, OAS2, OAS2MAPW, OAS2FUNC, OAS2RECV, OAS2MAPR, OAS2DOTTYPE, OASOP,
	OBAD,
	OCALL, OCALLFUNC, OCALLMETH, OCALLINTER,
	OCAP,
	OCLOSE,
	OCLOSURE,
	OCMPIFACE, OCMPSTR,
	OCOMPLIT, OMAPLIT, OSTRUCTLIT, OARRAYLIT,
	OCONV, OCONVIFACE, OCONVNOP,
	OCOPY,
	ODCL, ODCLFUNC, ODCLFIELD, ODCLCONST, ODCLTYPE,
	ODOT, ODOTPTR, ODOTMETH, ODOTINTER, OXDOT,
	ODOTTYPE,
	ODOTTYPE2,
	OEQ, ONE, OLT, OLE, OGE, OGT,
	OIND,
	OINDEX, OINDEXMAP,
	OKEY, OPARAM,
	OLEN,
	OMAKE, OMAKECHAN, OMAKEMAP, OMAKESLICE,
	OHMUL, ORRC, OLRC,	// high-mul and rotate-carry
	OMUL, ODIV, OMOD, OLSH, ORSH, OAND, OANDNOT,
	ONEW,
	ONOT, OCOM, OPLUS, OMINUS,
	OOROR,
	OPANIC, OPRINT, OPRINTN,
	OSEND,
	OSLICE, OSLICEARR, OSLICESTR,
	ORECOVER,
	ORECV,
	ORUNESTR,
	OSELRECV,
	OSELRECV2,
	OIOTA,
	OREAL, OIMAG, OCOMPLEX,

	// stmts
	OBLOCK,
	OBREAK,
	OCASE, OXCASE,
	OCONTINUE,
	ODEFER,
	OEMPTY,
	OFALL, OXFALL,
	OFOR,
	OGOTO,
	OIF,
	OLABEL,
	OPROC,
	ORANGE,
	ORETURN,
	OSELECT,
	OSWITCH,
	OTYPESW,	// l = r.(type)

	// types
	OTCHAN,
	OTMAP,
	OTSTRUCT,
	OTINTER,
	OTFUNC,
	OTARRAY,
	OTPAREN,

	// misc
	ODDD,

	// for back ends
	OCMP, ODEC, OEXTEND, OINC, OREGISTER, OINDREG,

	OEND,
};
enum
{
	Txxx,			// 0

	TINT8,	TUINT8,		// 1
	TINT16,	TUINT16,
	TINT32,	TUINT32,
	TINT64,	TUINT64,
	TINT, TUINT, TUINTPTR,

	TCOMPLEX64,		// 12
	TCOMPLEX128,

	TFLOAT32,		// 14
	TFLOAT64,

	TBOOL,			// 16

	TPTR32, TPTR64,		// 17

	TFUNC,			// 19
	TARRAY,
	T_old_DARRAY,
	TSTRUCT,		// 22
	TCHAN,
	TMAP,
	TINTER,			// 25
	TFORW,
	TFIELD,
	TANY,
	TSTRING,
	TUNSAFEPTR,

	// pseudo-types for literals
	TIDEAL,			// 31
	TNIL,
	TBLANK,

	// pseudo-type for frame layout
	TFUNCARGS,
	TCHANARGS,
	TINTERMETH,

	NTYPE,
};
enum
{
	CTxxx,

	CTINT,
	CTFLT,
	CTCPLX,
	CTSTR,
	CTBOOL,
	CTNIL,
};

enum
{
	/* types of channel */
	/* must match ../../pkg/nreflect/type.go:/Chandir */
	Cxxx,
	Crecv = 1<<0,
	Csend = 1<<1,
	Cboth = Crecv | Csend,
};

enum
{
	Pxxx,

	PEXTERN,	// declaration context
	PAUTO,
	PPARAM,
	PPARAMOUT,
	PPARAMREF,	// param passed by reference
	PFUNC,

	PHEAP = 1<<7,
};

enum
{
	Etop = 1<<1,		// evaluated at statement level
	Erv = 1<<2,		// evaluated in value context
	Etype = 1<<3,
	Ecall = 1<<4,		// call-only expressions are ok
	Efnstruct = 1<<5,	// multivalue function returns are ok
	Eiota = 1<<6,		// iota is ok
	Easgn = 1<<7,		// assigning to expression
	Eindir = 1<<8,		// indirecting through expression
	Eaddr = 1<<9,		// taking address of expression
	Eproc = 1<<10,		// inside a go statement
};

#define	BITS	5
#define	NVAR	(BITS*sizeof(uint32)*8)

typedef	struct	Bits	Bits;
struct	Bits
{
	uint32	b[BITS];
};

EXTERN	Bits	zbits;

typedef	struct	Var	Var;
struct	Var
{
	vlong	offset;
	Sym*	sym;
	Sym*	gotype;
	Node*	node;
	int	width;
	char	name;
	char	etype;
	char	addr;
};

EXTERN	Var	var[NVAR];

typedef	struct	Typedef	Typedef;
struct	Typedef
{
	char*	name;
	int	etype;
	int	sameas;
};

extern	Typedef	typedefs[];

typedef	struct	Sig	Sig;
struct	Sig
{
	char*	name;
	Pkg*	pkg;
	Sym*	isym;
	Sym*	tsym;
	Type*	type;
	Type*	mtype;
	int32	offset;
	Sig*	link;
};

typedef	struct	Io	Io;
struct	Io
{
	char*	infile;
	Biobuf*	bin;
	int32	ilineno;
	int	nlsemi;
	int	eofnl;
	int	peekc;
	int	peekc1;	// second peekc for ...
	char*	cp;	// used for content when bin==nil
	int	importsafe;
};

typedef	struct	Dlist	Dlist;
struct	Dlist
{
	Type*	field;
};

typedef	struct	Idir	Idir;
struct Idir
{
	Idir*	link;
	char*	dir;
};

/*
 * argument passing to/from
 * smagic and umagic
 */
typedef	struct	Magic Magic;
struct	Magic
{
	int	w;	// input for both - width
	int	s;	// output for both - shift
	int	bad;	// output for both - unexpected failure

	// magic multiplier for signed literal divisors
	int64	sd;	// input - literal divisor
	int64	sm;	// output - multiplier

	// magic multiplier for unsigned literal divisors
	uint64	ud;	// input - literal divisor
	uint64	um;	// output - multiplier
	int	ua;	// output - adder
};

typedef struct	Prog Prog;

struct	Label
{
	uchar	used;
	Sym*	sym;
	Node*	def;
	NodeList*	use;
	Label*	link;
	
	// for use during gen
	Prog*	gotopc;	// pointer to unresolved gotos
	Prog*	labelpc;	// pointer to code
	Prog*	breakpc;	// pointer to code
	Prog*	continpc;	// pointer to code
};
#define	L	((Label*)0)

/*
 * note this is the runtime representation
 * of the compilers arrays.
 *
 * typedef	struct
 * {				// must not move anything
 *	uchar	array[8];	// pointer to data
 *	uchar	nel[4];		// number of elements
 *	uchar	cap[4];		// allocated number of elements
 * } Array;
 */
EXTERN	int	Array_array;	// runtime offsetof(Array,array) - same for String
EXTERN	int	Array_nel;	// runtime offsetof(Array,nel) - same for String
EXTERN	int	Array_cap;	// runtime offsetof(Array,cap)
EXTERN	int	sizeof_Array;	// runtime sizeof(Array)


/*
 * note this is the runtime representation
 * of the compilers strings.
 *
 * typedef	struct
 * {				// must not move anything
 *	uchar	array[8];	// pointer to data
 *	uchar	nel[4];		// number of elements
 * } String;
 */
EXTERN	int	sizeof_String;	// runtime sizeof(String)

EXTERN	Dlist	dotlist[10];	// size is max depth of embeddeds

EXTERN	Io	curio;
EXTERN	Io	pushedio;
EXTERN	int32	lexlineno;
EXTERN	int32	lineno;
EXTERN	int32	prevlineno;
EXTERN	char*	pathname;
EXTERN	Hist*	hist;
EXTERN	Hist*	ehist;

EXTERN	char*	infile;
EXTERN	char*	outfile;
EXTERN	Biobuf*	bout;
EXTERN	int	nerrors;
EXTERN	int	nsavederrors;
EXTERN	int	nsyntaxerrors;
EXTERN	int	safemode;
EXTERN	char	namebuf[NSYMB];
EXTERN	char	lexbuf[NSYMB];
EXTERN	char	debug[256];
EXTERN	Sym*	hash[NHASH];
EXTERN	Sym*	importmyname;	// my name for package
EXTERN	Pkg*	localpkg;	// package being compiled
EXTERN	Pkg*	importpkg;	// package being imported
EXTERN	Pkg*	structpkg;	// package that declared struct, during import
EXTERN	Pkg*	builtinpkg;	// fake package for builtins
EXTERN	Pkg*	gostringpkg;	// fake pkg for Go strings
EXTERN	Pkg*	runtimepkg;	// package runtime
EXTERN	Pkg*	stringpkg;	// fake package for C strings
EXTERN	Pkg*	typepkg;	// fake package for runtime type info
EXTERN	Pkg*	unsafepkg;	// package unsafe
EXTERN	Pkg*	phash[128];
EXTERN	int	tptr;		// either TPTR32 or TPTR64
extern	char*	runtimeimport;
extern	char*	unsafeimport;
EXTERN	Idir*	idirs;

EXTERN	Type*	types[NTYPE];
EXTERN	Type*	idealstring;
EXTERN	Type*	idealbool;
EXTERN	uchar	simtype[NTYPE];
EXTERN	uchar	isptr[NTYPE];
EXTERN	uchar	isforw[NTYPE];
EXTERN	uchar	isint[NTYPE];
EXTERN	uchar	isfloat[NTYPE];
EXTERN	uchar	iscomplex[NTYPE];
EXTERN	uchar	issigned[NTYPE];
EXTERN	uchar	issimple[NTYPE];

EXTERN	uchar	okforeq[NTYPE];
EXTERN	uchar	okforadd[NTYPE];
EXTERN	uchar	okforand[NTYPE];
EXTERN	uchar	okfornone[NTYPE];
EXTERN	uchar	okforcmp[NTYPE];
EXTERN	uchar	okforbool[NTYPE];
EXTERN	uchar	okforcap[NTYPE];
EXTERN	uchar	okforlen[NTYPE];
EXTERN	uchar	okforarith[NTYPE];
EXTERN	uchar	okforconst[NTYPE];
EXTERN	uchar*	okfor[OEND];
EXTERN	uchar	iscmp[OEND];

EXTERN	Mpint*	minintval[NTYPE];
EXTERN	Mpint*	maxintval[NTYPE];
EXTERN	Mpflt*	minfltval[NTYPE];
EXTERN	Mpflt*	maxfltval[NTYPE];

EXTERN	NodeList*	xtop;
EXTERN	NodeList*	externdcl;
EXTERN	NodeList*	closures;
EXTERN	NodeList*	exportlist;
EXTERN	NodeList*	typelist;
EXTERN	int	dclcontext;		// PEXTERN/PAUTO
EXTERN	int	incannedimport;
EXTERN	int	statuniqgen;		// name generator for static temps
EXTERN	int	loophack;

EXTERN	int32	iota;
EXTERN	NodeList*	lastconst;
EXTERN	Node*	lasttype;
EXTERN	int32	maxarg;
EXTERN	int32	stksize;		// stack size for current frame
EXTERN	int32	blockgen;		// max block number
EXTERN	int32	block;			// current block number
EXTERN	int	hasdefer;		// flag that curfn has defer statetment

EXTERN	Node*	curfn;

EXTERN	int	widthptr;

EXTERN	Node*	typesw;
EXTERN	Node*	nblank;

extern	int	thechar;
extern	char*	thestring;
EXTERN	char*	hunk;
EXTERN	int32	nhunk;
EXTERN	int32	thunk;

EXTERN	int	exporting;
EXTERN	int	noargnames;

EXTERN	int	funcdepth;
EXTERN	int	typecheckok;
EXTERN	int	packagequotes;
EXTERN	int	longsymnames;
EXTERN	int	compiling_runtime;

/*
 *	y.tab.c
 */
int	yyparse(void);

/*
 *	align.c
 */
int	argsize(Type *t);
void	checkwidth(Type *t);
void	defercheckwidth(void);
void	dowidth(Type *t);
void	resumecheckwidth(void);
uint32	rnd(uint32 o, uint32 r);
void	typeinit(void);

/*
 *	bits.c
 */
int	Qconv(Fmt *fp);
Bits	band(Bits a, Bits b);
int	bany(Bits *a);
int	beq(Bits a, Bits b);
int	bitno(int32 b);
Bits	blsh(uint n);
Bits	bnot(Bits a);
int	bnum(Bits a);
Bits	bor(Bits a, Bits b);
int	bset(Bits a, uint n);

/*
 *	closure.c
 */
Node*	closurebody(NodeList *body);
void	closurehdr(Node *ntype);
void	typecheckclosure(Node *func, int top);
Node*	walkclosure(Node *func, NodeList **init);
void	walkcallclosure(Node *n, NodeList **init);

/*
 *	const.c
 */
int	cmpslit(Node *l, Node *r);
int	consttype(Node *n);
void	convconst(Node *con, Type *t, Val *val);
void	convlit(Node **np, Type *t);
void	convlit1(Node **np, Type *t, int explicit);
void	defaultlit(Node **np, Type *t);
void	defaultlit2(Node **lp, Node **rp, int force);
void	evconst(Node *n);
int	isconst(Node *n, int ct);
Node*	nodcplxlit(Val r, Val i);
Node*	nodlit(Val v);
long	nonnegconst(Node *n);
void	overflow(Val v, Type *t);
int	smallintconst(Node *n);
Val	toint(Val v);
Mpflt*	truncfltlit(Mpflt *oldv, Type *t);

/*
 *	cplx.c
 */
void	complexadd(int op, Node *nl, Node *nr, Node *res);
void	complexbool(int op, Node *nl, Node *nr, int true, Prog *to);
void	complexgen(Node *n, Node *res);
void	complexminus(Node *nl, Node *res);
void	complexmove(Node *f, Node *t);
void	complexmul(Node *nl, Node *nr, Node *res);
int	complexop(Node *n, Node *res);
void	nodfconst(Node *n, Type *t, Mpflt* fval);

/*
 *	dcl.c
 */
void	addmethod(Sym *sf, Type *t, int local);
void	addvar(Node *n, Type *t, int ctxt);
NodeList*	checkarglist(NodeList *all, int input);
Node*	colas(NodeList *left, NodeList *right);
void	colasdefn(NodeList *left, Node *defn);
NodeList*	constiter(NodeList *vl, Node *t, NodeList *cl);
Node*	dclname(Sym *s);
void	declare(Node *n, int ctxt);
Type*	dostruct(NodeList *l, int et);
void	dumpdcl(char *st);
Node*	embedded(Sym *s);
Node*	fakethis(void);
void	funcbody(Node *n);
void	funccompile(Node *n, int isclosure);
void	funchdr(Node *n);
Type*	functype(Node *this, NodeList *in, NodeList *out);
void	ifacedcl(Node *n);
int	isifacemethod(Type *f);
void	markdcl(void);
Node*	methodname(Node *n, Type *t);
Node*	methodname1(Node *n, Node *t);
Sym*	methodsym(Sym *nsym, Type *t0, int iface);
Node*	newname(Sym *s);
Type*	newtype(Sym *s);
Node*	oldname(Sym *s);
void	popdcl(void);
void	poptodcl(void);
void	redeclare(Sym *s, char *where);
void	testdclstack(void);
Node*	typedcl0(Sym *s);
Node*	typedcl1(Node *n, Node *t, int local);
void	typedcl2(Type *pt, Type *t);
Node*	typenod(Type *t);
NodeList*	variter(NodeList *vl, Node *t, NodeList *el);

/*
 *	export.c
 */
void	autoexport(Node *n, int ctxt);
void	dumpexport(void);
int	exportname(char *s);
void	exportsym(Node *n);
void	importconst(Sym *s, Type *t, Node *n);
void	importmethod(Sym *s, Type *t);
Sym*	importsym(Sym *s, int op);
void	importtype(Type *pt, Type *t);
void	importvar(Sym *s, Type *t, int ctxt);
Type*	pkgtype(Sym *s);

/*
 *	gen.c
 */
void	allocparams(void);
void	cgen_as(Node *nl, Node *nr);
void	cgen_callmeth(Node *n, int proc);
void	clearlabels(void);
void	checklabels(void);
int	dotoffset(Node *n, int *oary, Node **nn);
void	gen(Node *n);
void	genlist(NodeList *l);
Node*	sysfunc(char *name);
void	tempname(Node *n, Type *t);

/*
 *	init.c
 */
void	fninit(NodeList *n);
Node*	renameinit(Node *n);

/*
 *	lex.c
 */
void	cannedimports(char *file, char *cp);
void	importfile(Val *f, int line);
char*	lexname(int lex);
void	mkpackage(char* pkgname);
void	unimportfile(void);
int32	yylex(void);
extern	int	windows;
extern	int	yylast;
extern	int	yyprev;

/*
 *	mparith1.c
 */
int	Bconv(Fmt *fp);
int	Fconv(Fmt *fp);
void	mpaddcfix(Mpint *a, vlong c);
void	mpaddcflt(Mpflt *a, double c);
void	mpatofix(Mpint *a, char *as);
void	mpatoflt(Mpflt *a, char *as);
int	mpcmpfixc(Mpint *b, vlong c);
int	mpcmpfixfix(Mpint *a, Mpint *b);
int	mpcmpfixflt(Mpint *a, Mpflt *b);
int	mpcmpfltc(Mpflt *b, double c);
int	mpcmpfltfix(Mpflt *a, Mpint *b);
int	mpcmpfltflt(Mpflt *a, Mpflt *b);
void	mpcomfix(Mpint *a);
void	mpdivfixfix(Mpint *a, Mpint *b);
void	mpmodfixfix(Mpint *a, Mpint *b);
void	mpmovefixfix(Mpint *a, Mpint *b);
void	mpmovefixflt(Mpflt *a, Mpint *b);
int	mpmovefltfix(Mpint *a, Mpflt *b);
void	mpmovefltflt(Mpflt *a, Mpflt *b);
void	mpmulcfix(Mpint *a, vlong c);
void	mpmulcflt(Mpflt *a, double c);
void	mpsubfixfix(Mpint *a, Mpint *b);
void	mpsubfltflt(Mpflt *a, Mpflt *b);

/*
 *	mparith2.c
 */
void	mpaddfixfix(Mpint *a, Mpint *b);
void	mpandfixfix(Mpint *a, Mpint *b);
void	mpandnotfixfix(Mpint *a, Mpint *b);
void	mpdivfract(Mpint *a, Mpint *b);
void	mpdivmodfixfix(Mpint *q, Mpint *r, Mpint *n, Mpint *d);
vlong	mpgetfix(Mpint *a);
void	mplshfixfix(Mpint *a, Mpint *b);
void	mpmovecfix(Mpint *a, vlong c);
void	mpmulfixfix(Mpint *a, Mpint *b);
void	mpmulfract(Mpint *a, Mpint *b);
void	mpnegfix(Mpint *a);
void	mporfixfix(Mpint *a, Mpint *b);
void	mprshfixfix(Mpint *a, Mpint *b);
void	mpshiftfix(Mpint *a, int s);
int	mptestfix(Mpint *a);
void	mpxorfixfix(Mpint *a, Mpint *b);

/*
 *	mparith3.c
 */
void	mpaddfltflt(Mpflt *a, Mpflt *b);
void	mpdivfltflt(Mpflt *a, Mpflt *b);
double	mpgetflt(Mpflt *a);
void	mpmovecflt(Mpflt *a, double c);
void	mpmulfltflt(Mpflt *a, Mpflt *b);
void	mpnegflt(Mpflt *a);
void	mpnorm(Mpflt *a);
int	mptestflt(Mpflt *a);
int	sigfig(Mpflt *a);

/*
 *	obj.c
 */
void	Bputname(Biobuf *b, Sym *s);
int	duint16(Sym *s, int off, uint16 v);
int	duint32(Sym *s, int off, uint32 v);
int	duint64(Sym *s, int off, uint64 v);
int	duint8(Sym *s, int off, uint8 v);
int	duintptr(Sym *s, int off, uint64 v);
int	dsname(Sym *s, int off, char *dat, int ndat);
void	dumpobj(void);
void	ieeedtod(uint64 *ieee, double native);
Sym*	stringsym(char*, int);

/*
 *	print.c
 */
void	exprfmt(Fmt *f, Node *n, int prec);
void	exprlistfmt(Fmt *f, NodeList *l);

/*
 *	range.c
 */
void	typecheckrange(Node *n);
void	walkrange(Node *n);

/*
 *	reflect.c
 */
void	dumptypestructs(void);
Type*	methodfunc(Type *f, Type*);
Node*	typename(Type *t);
Sym*	typesym(Type *t);

/*
 *	select.c
 */
void	typecheckselect(Node *sel);
void	walkselect(Node *sel);

/*
 *	sinit.c
 */
void	anylit(int, Node *n, Node *var, NodeList **init);
int	gen_as_init(Node *n);
NodeList*	initfix(NodeList *l);
int	oaslit(Node *n, NodeList **init);
int	stataddr(Node *nam, Node *n);

/*
 *	subr.c
 */
int	Econv(Fmt *fp);
int	Jconv(Fmt *fp);
int	Lconv(Fmt *fp);
int	Nconv(Fmt *fp);
int	Oconv(Fmt *fp);
int	Sconv(Fmt *fp);
int	Tconv(Fmt *fp);
int	Tpretty(Fmt *fp, Type *t);
int	Zconv(Fmt *fp);
Node*	adddot(Node *n);
int	adddot1(Sym *s, Type *t, int d, Type **save, int ignorecase);
Type*	aindex(Node *b, Type *t);
int	algtype(Type *t);
void	argtype(Node *on, Type *t);
Node*	assignconv(Node *n, Type *t, char *context);
int	assignop(Type *src, Type *dst, char **why);
void	badtype(int o, Type *tl, Type *tr);
int	brcom(int a);
int	brrev(int a);
NodeList*	concat(NodeList *a, NodeList *b);
int	convertop(Type *src, Type *dst, char **why);
int	count(NodeList *l);
int	cplxsubtype(int et);
void	dump(char *s, Node *n);
void	dumplist(char *s, NodeList *l);
int	eqtype(Type *t1, Type *t2);
int	eqtypenoname(Type *t1, Type *t2);
void	errorexit(void);
void	expandmeth(Sym *s, Type *t);
void	fatal(char *fmt, ...);
void	flusherrors(void);
void	frame(int context);
Type*	funcfirst(Iter *s, Type *t);
Type*	funcnext(Iter *s);
void	genwrapper(Type *rcvr, Type *method, Sym *newnam, int iface);
Type**	getinarg(Type *t);
Type*	getinargx(Type *t);
Type**	getoutarg(Type *t);
Type*	getoutargx(Type *t);
Type**	getthis(Type *t);
Type*	getthisx(Type *t);
int	implements(Type *t, Type *iface, Type **missing, Type **have, int *ptr);
void	importdot(Pkg *opkg, Node *pack);
int	is64(Type *t);
int	isblank(Node *n);
int	isfixedarray(Type *t);
int	isideal(Type *t);
int	isinter(Type *t);
int	isnil(Node *n);
int	isnilinter(Type *t);
int	isptrto(Type *t, int et);
int	isselect(Node *n);
int	isslice(Type *t);
int	istype(Type *t, int et);
void	linehist(char *file, int32 off, int relative);
NodeList*	list(NodeList *l, Node *n);
NodeList*	list1(Node *n);
void	listsort(NodeList**, int(*f)(Node*, Node*));
Node*	liststmt(NodeList *l);
NodeList*	listtreecopy(NodeList *l);
Sym*	lookup(char *name);
void*	mal(int32 n);
Type*	maptype(Type *key, Type *val);
Type*	methtype(Type *t);
Pkg*	mkpkg(Strlit *path);
Sym*	ngotype(Node *n);
int	noconv(Type *t1, Type *t2);
Node*	nod(int op, Node *nleft, Node *nright);
Node*	nodbool(int b);
void	nodconst(Node *n, Type *t, int64 v);
Node*	nodintconst(int64 v);
Node*	nodfltconst(Mpflt *v);
Node*	nodnil(void);
int	parserline(void);
Sym*	pkglookup(char *name, Pkg *pkg);
int	powtwo(Node *n);
Type*	ptrto(Type *t);
void*	remal(void *p, int32 on, int32 n);
Sym*	restrictlookup(char *name, Pkg *pkg);
Node*	safeexpr(Node *n, NodeList **init);
void	saveerrors(void);
Node*	cheapexpr(Node *n, NodeList **init);
int32	setlineno(Node *n);
void	setmaxarg(Type *t);
Type*	shallow(Type *t);
int	simsimtype(Type *t);
void	smagic(Magic *m);
Type*	sortinter(Type *t);
uint32	stringhash(char *p);
Strlit*	strlit(char *s);
int	structcount(Type *t);
Type*	structfirst(Iter *s, Type **nn);
Type*	structnext(Iter *s);
Node*	syslook(char *name, int copy);
Type*	tounsigned(Type *t);
Node*	treecopy(Node *n);
Type*	typ(int et);
uint32	typehash(Type *t);
void	ullmancalc(Node *n);
void	umagic(Magic *m);
void	warn(char *fmt, ...);
void	yyerror(char *fmt, ...);
void	yyerrorl(int line, char *fmt, ...);

/*
 *	swt.c
 */
void	typecheckswitch(Node *n);
void	walkswitch(Node *sw);

/*
 *	typecheck.c
 */
int	exportassignok(Type *t, char *desc);
int	islvalue(Node *n);
Node*	typecheck(Node **np, int top);
void	typechecklist(NodeList *l, int top);
Node*	typecheckdef(Node *n);
void	resumetypecopy(void);
void	copytype(Node *n, Type *t);
void	defertypecopy(Node *n, Type *t);
void	queuemethod(Node *n);

/*
 *	unsafe.c
 */
Node*	unsafenmagic(Node *n);

/*
 *	walk.c
 */
Node*	callnew(Type *t);
Node*	chanfn(char *name, int n, Type *t);
Node*	mkcall(char *name, Type *t, NodeList **init, ...);
Node*	mkcall1(Node *fn, Type *t, NodeList **init, ...);
int	vmatch1(Node *l, Node *r);
void	walk(Node *fn);
void	walkexpr(Node **np, NodeList **init);
void	walkexprlist(NodeList *l, NodeList **init);
void	walkexprlistsafe(NodeList *l, NodeList **init);
void	walkstmt(Node **np);
void	walkstmtlist(NodeList *l);

/*
 *	arch-specific ggen.c/gsubr.c/gobj.c/pgen.c
 */
#define	P	((Prog*)0)

typedef	struct	Plist	Plist;
struct	Plist
{
	Node*	name;
	Prog*	firstpc;
	int	recur;
	Plist*	link;
};

EXTERN	Plist*	plist;
EXTERN	Plist*	plast;

EXTERN	Prog*	continpc;
EXTERN	Prog*	breakpc;
EXTERN	Prog*	pc;
EXTERN	Prog*	firstpc;
EXTERN	Prog*	retpc;

EXTERN	Node*	nodfp;

int	anyregalloc(void);
void	betypeinit(void);
void	bgen(Node *n, int true, Prog *to);
void	cgen(Node*, Node*);
void	cgen_asop(Node *n);
void	cgen_call(Node *n, int proc);
void	cgen_callinter(Node *n, Node *res, int proc);
void	cgen_ret(Node *n);
void	clearfat(Node *n);
void	compile(Node*);
void	defframe(Prog*);
int	dgostringptr(Sym*, int off, char *str);
int	dgostrlitptr(Sym*, int off, Strlit*);
int	dstringptr(Sym *s, int off, char *str);
int	dsymptr(Sym *s, int off, Sym *x, int xoff);
int	duintxx(Sym *s, int off, uint64 v, int wid);
void	dumpdata(void);
void	dumpfuncs(void);
void	fixautoused(Prog*);
void	gdata(Node*, Node*, int);
void	gdatacomplex(Node*, Mpcplx*);
void	gdatastring(Node*, Strlit*);
void	genembedtramp(Type*, Type*, Sym*, int iface);
void	ggloblnod(Node *nam, int32 width);
void	ggloblsym(Sym *s, int32 width, int dupok);
Prog*	gjmp(Prog*);
void	gused(Node*);
int	isfat(Type*);
void	markautoused(Prog*);
Plist*	newplist(void);
Node*	nodarg(Type*, int);
void	nopout(Prog*);
void	patch(Prog*, Prog*);
Prog*	unpatch(Prog*);
void	zfile(Biobuf *b, char *p, int n);
void	zhist(Biobuf *b, int line, vlong offset);
void	zname(Biobuf *b, Sym *s, int t);
void	data(void);
void	text(void);