src/cmd/cc/godefs.c - go - Git at Google

 //   cmd/cc/godefs.cc
 //
 //   derived from pickle.cc which itself was derived from acid.cc.
 //
 //	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 © 2009-2011 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.

 #include <u.h>
 #include "cc.h"

 static int upper;

 static char *kwd[] =
 {
 	"_bool",
 	"_break",
 	"_byte",
 	"_case",
 	"_chan",
 	"_complex128",
 	"_complex64",
 	"_const",
 	"_continue",
 	"_default",
 	"_defer",
 	"_else",
 	"_fallthrough",
 	"_false",
 	"_float32",
 	"_float64",
 	"_for",
 	"_func",
 	"_go",
 	"_goto",
 	"_if",
 	"_import",
 	"_int",
 	"_int16",
 	"_int32",
 	"_int64",
 	"_int8",
 	"_interface",
 	"_intptr",
 	"_map",
 	"_package",
 	"_panic",
 	"_range",
 	"_return",
 	"_select",
 	"_string",
 	"_struct",
 	"_switch",
 	"_true",
 	"_type",
 	"_uint",
 	"_uint16",
 	"_uint32",
 	"_uint64",
 	"_uint8",
 	"_uintptr",
 	"_var",
 };

 static char*
 pmap(char *s)
 {
 	int i, bot, top, mid;

 	bot = -1;
 	top = nelem(kwd);
 	while(top - bot > 1){
 		mid = (bot + top) / 2;
 		i = strcmp(kwd[mid]+1, s);
 		if(i == 0)
 			return kwd[mid];
 		if(i < 0)
 			bot = mid;
 		else
 			top = mid;
 	}

 	return s;
 }


 int
 Uconv(Fmt *fp)
 {
 	char str[STRINGSZ+1];
 	char *s, *n;
 	int i;

 	str[0] = 0;
 	s = va_arg(fp->args, char*);

 	// strip package name
 	n = strrchr(s, '.');
 	if(n != nil)
 		s = n + 1;

 	if(s && *s) {
 		if(upper)
 			str[0] = toupper((uchar)*s);
 		else
 			str[0] = tolower((uchar)*s);
 		for(i = 1; i < STRINGSZ && s[i] != 0; i++)
 			str[i] = tolower((uchar)s[i]);
 		str[i] = 0;
 	}

 	return fmtstrcpy(fp, pmap(str));
 }


 static Sym*
 findsue(Type *t)
 {
 	int h;
 	Sym *s;

 	if(t != T)
 	for(h=0; h<nelem(hash); h++)
 		for(s = hash[h]; s != S; s = s->link)
 			if(s->suetag && s->suetag->link == t)
 				return s;
 	return 0;
 }

 static void
 printtypename(Type *t)
 {
 	Sym *s;
 	int w;
 	char *n;

 	for( ; t != nil; t = t->link) {
 		switch(t->etype) {
 		case TIND:
 			// Special handling of *void.
 			if(t->link != nil && t->link->etype==TVOID) {
 				Bprint(&outbuf, "unsafe.Pointer");
 				return;
 			}
 			// *func == func
 			if(t->link != nil && t->link->etype==TFUNC)
 				continue;
 			Bprint(&outbuf, "*");
 			continue;
 		case TARRAY:
 			w = t->width;
 			if(t->link && t->link->width)
 				w /= t->link->width;
 			Bprint(&outbuf, "[%d]", w);
 			continue;
 		}
 		break;
 	}

 	if(t == nil) {
 		Bprint(&outbuf, "bad // should not happen");
 		return;
 	}

 	switch(t->etype) {
 	case TINT:
 	case TUINT:
 	case TCHAR:
 	case TUCHAR:
 	case TSHORT:
 	case TUSHORT:
 	case TLONG:
 	case TULONG:
 	case TVLONG:
 	case TUVLONG:
 	case TFLOAT:
 	case TDOUBLE:
 		// All names used in the runtime code should be typedefs.
 		if(t->tag != nil) {
 			if(strcmp(t->tag->name, "intgo") == 0)
 				Bprint(&outbuf, "int");
 			else if(strcmp(t->tag->name, "uintgo") == 0)
 				Bprint(&outbuf, "uint");
 			else
 				Bprint(&outbuf, "%s", t->tag->name);
 		} else
 			Bprint(&outbuf, "C.%T", t);
 		break;
 	case TUNION:
 	case TSTRUCT:
 		s = findsue(t->link);
 		n = "bad";
 		if(s != S)
 			n = s->name;
 		else if(t->tag)
 			n = t->tag->name;
 		if(strcmp(n, "String") == 0)
 			Bprint(&outbuf, "string");
 		else if(strcmp(n, "Slice") == 0)
 			Bprint(&outbuf, "[]byte");
 		else if(strcmp(n, "Eface") == 0)
 			Bprint(&outbuf, "interface{}");
 		else
 			Bprint(&outbuf, "%U", n);
 		break;
 	case TFUNC:
 		// There's no equivalent to a C function in the Go world.
 		Bprint(&outbuf, "unsafe.Pointer");
 		break;
 	case TDOT:
 		Bprint(&outbuf, "...interface{}");
 		break;
 	default:
 		Bprint(&outbuf, " weird<%T>", t);
 	}
 }

 static int
 dontrun(void)
 {
 	Io *i;
 	int n;

 	if(!debug['q'] && !debug['Q'])
 		return 1;
 	if(debug['q'] + debug['Q'] > 1) {
 		n = 0;
 		for(i=iostack; i; i=i->link)
 			n++;
 		if(n > 1)
 			return 1;
 	}

 	upper = debug['Q'];
 	return 0;
 }

 void
 godeftype(Type *t)
 {
 	Sym *s;
 	Type *l;
 	int gotone;

 	if(dontrun())
 		return;

 	switch(t->etype) {
 	case TUNION:
 	case TSTRUCT:
 		s = findsue(t->link);
 		if(s == S) {
 			Bprint(&outbuf, "/* can't find %T */\n\n", t);
 			return;
 		}

 		gotone = 0; // for unions, take first member of size equal to union
 		Bprint(&outbuf, "type %U struct {\n", s->name);
 		for(l = t->link; l != T; l = l->down) {
 			Bprint(&outbuf, "\t");
 			if(t->etype == TUNION) {
 				if(!gotone && l->width == t->width)
 					gotone = 1;
 				else
 					Bprint(&outbuf, "// (union)\t");
 			}
 			if(l->sym != nil)  // not anonymous field
 				Bprint(&outbuf, "%U\t", l->sym->name);
 			printtypename(l);
 			Bprint(&outbuf, "\n");
 		}
 		Bprint(&outbuf, "}\n\n");
 		break;

 	default:
 		Bprint(&outbuf, "/* %T */\n\n", t);
 		break;
 	}
 }

 void
 godefvar(Sym *s)
 {
 	Type *t, *t1;
 	char n;

 	if(dontrun())
 		return;

 	t = s->type;
 	if(t == nil)
 		return;

 	switch(t->etype) {
 	case TENUM:
 		if(!typefd[t->etype])
 			Bprint(&outbuf, "const %s = %lld\n", s->name, s->vconst);
 		else
 			Bprint(&outbuf, "const %s = %f\n;", s->name, s->fconst);
 		break;

 	case TFUNC:
 		Bprint(&outbuf, "func %U(", s->name);
 		n = 'a';
 		for(t1 = t->down; t1 != T; t1 = t1->down) {
 			if(t1->etype == TVOID)
 				break;
 			if(t1 != t->down)
 				Bprint(&outbuf, ", ");
 			Bprint(&outbuf, "%c ", n++);
 			printtypename(t1);
 		}
 		Bprint(&outbuf, ")");
 		if(t->link && t->link->etype != TVOID) {
 			Bprint(&outbuf, " ");
 			printtypename(t->link);
 		}
 		Bprint(&outbuf, "\n");
 		break;

 	default:
 		switch(s->class) {
 		case CTYPEDEF:
 			if(!typesu[t->etype]) {
 				Bprint(&outbuf, "// type %U\t", s->name);
 				printtypename(t);
 				Bprint(&outbuf, "\n");
 			}
 			break;
 		case CSTATIC:
 		case CEXTERN:
 		case CGLOBL:
 			if(strchr(s->name, '$') != nil)
 				break;
 			if(strncmp(s->name, "go.weak.", 8) == 0)
 				break;
 			Bprint(&outbuf, "var %U\t", s->name);
 			printtypename(t);
 			Bprint(&outbuf, "\n");
 			break;
 		}
 		break;
 	}
 }
	// cmd/cc/godefs.cc
	//
	// derived from pickle.cc which itself was derived from acid.cc.
	//
	// 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 © 2009-2011 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.

	#include <u.h>
	#include "cc.h"

	static int upper;

	static char *kwd[] =
	{
	"_bool",
	"_break",
	"_byte",
	"_case",
	"_chan",
	"_complex128",
	"_complex64",
	"_const",
	"_continue",
	"_default",
	"_defer",
	"_else",
	"_fallthrough",
	"_false",
	"_float32",
	"_float64",
	"_for",
	"_func",
	"_go",
	"_goto",
	"_if",
	"_import",
	"_int",
	"_int16",
	"_int32",
	"_int64",
	"_int8",
	"_interface",
	"_intptr",
	"_map",
	"_package",
	"_panic",
	"_range",
	"_return",
	"_select",
	"_string",
	"_struct",
	"_switch",
	"_true",
	"_type",
	"_uint",
	"_uint16",
	"_uint32",
	"_uint64",
	"_uint8",
	"_uintptr",
	"_var",
	};

	static char*
	pmap(char *s)
	{
	int i, bot, top, mid;

	bot = -1;
	top = nelem(kwd);
	while(top - bot > 1){
	mid = (bot + top) / 2;
	i = strcmp(kwd[mid]+1, s);
	if(i == 0)
	return kwd[mid];
	if(i < 0)
	bot = mid;
	else
	top = mid;
	}

	return s;
	}


	int
	Uconv(Fmt *fp)
	{
	char str[STRINGSZ+1];
	char s, n;
	int i;

	str[0] = 0;
	s = va_arg(fp->args, char*);

	// strip package name
	n = strrchr(s, '.');
	if(n != nil)
	s = n + 1;

	if(s && *s) {
	if(upper)
	str[0] = toupper((uchar)*s);
	else
	str[0] = tolower((uchar)*s);
	for(i = 1; i < STRINGSZ && s[i] != 0; i++)
	str[i] = tolower((uchar)s[i]);
	str[i] = 0;
	}

	return fmtstrcpy(fp, pmap(str));
	}


	static Sym*
	findsue(Type *t)
	{
	int h;
	Sym *s;

	if(t != T)
	for(h=0; h<nelem(hash); h++)
	for(s = hash[h]; s != S; s = s->link)
	if(s->suetag && s->suetag->link == t)
	return s;
	return 0;
	}

	static void
	printtypename(Type *t)
	{
	Sym *s;
	int w;
	char *n;

	for( ; t != nil; t = t->link) {
	switch(t->etype) {
	case TIND:
	// Special handling of *void.
	if(t->link != nil && t->link->etype==TVOID) {
	Bprint(&outbuf, "unsafe.Pointer");
	return;
	}
	// *func == func
	if(t->link != nil && t->link->etype==TFUNC)
	continue;
	Bprint(&outbuf, "*");
	continue;
	case TARRAY:
	w = t->width;
	if(t->link && t->link->width)
	w /= t->link->width;
	Bprint(&outbuf, "[%d]", w);
	continue;
	}
	break;
	}

	if(t == nil) {
	Bprint(&outbuf, "bad // should not happen");
	return;
	}

	switch(t->etype) {
	case TINT:
	case TUINT:
	case TCHAR:
	case TUCHAR:
	case TSHORT:
	case TUSHORT:
	case TLONG:
	case TULONG:
	case TVLONG:
	case TUVLONG:
	case TFLOAT:
	case TDOUBLE:
	// All names used in the runtime code should be typedefs.
	if(t->tag != nil) {
	if(strcmp(t->tag->name, "intgo") == 0)
	Bprint(&outbuf, "int");
	else if(strcmp(t->tag->name, "uintgo") == 0)
	Bprint(&outbuf, "uint");
	else
	Bprint(&outbuf, "%s", t->tag->name);
	} else
	Bprint(&outbuf, "C.%T", t);
	break;
	case TUNION:
	case TSTRUCT:
	s = findsue(t->link);
	n = "bad";
	if(s != S)
	n = s->name;
	else if(t->tag)
	n = t->tag->name;
	if(strcmp(n, "String") == 0)
	Bprint(&outbuf, "string");
	else if(strcmp(n, "Slice") == 0)
	Bprint(&outbuf, "[]byte");
	else if(strcmp(n, "Eface") == 0)
	Bprint(&outbuf, "interface{}");
	else
	Bprint(&outbuf, "%U", n);
	break;
	case TFUNC:
	// There's no equivalent to a C function in the Go world.
	Bprint(&outbuf, "unsafe.Pointer");
	break;
	case TDOT:
	Bprint(&outbuf, "...interface{}");
	break;
	default:
	Bprint(&outbuf, " weird<%T>", t);
	}
	}

	static int
	dontrun(void)
	{
	Io *i;
	int n;

	if(!debug['q'] && !debug['Q'])
	return 1;
	if(debug['q'] + debug['Q'] > 1) {
	n = 0;
	for(i=iostack; i; i=i->link)
	n++;
	if(n > 1)
	return 1;
	}

	upper = debug['Q'];
	return 0;
	}

	void
	godeftype(Type *t)
	{
	Sym *s;
	Type *l;
	int gotone;

	if(dontrun())
	return;

	switch(t->etype) {
	case TUNION:
	case TSTRUCT:
	s = findsue(t->link);
	if(s == S) {
	Bprint(&outbuf, "/* can't find %T */\n\n", t);
	return;
	}

	gotone = 0; // for unions, take first member of size equal to union
	Bprint(&outbuf, "type %U struct {\n", s->name);
	for(l = t->link; l != T; l = l->down) {
	Bprint(&outbuf, "\t");
	if(t->etype == TUNION) {
	if(!gotone && l->width == t->width)
	gotone = 1;
	else
	Bprint(&outbuf, "// (union)\t");
	}
	if(l->sym != nil) // not anonymous field
	Bprint(&outbuf, "%U\t", l->sym->name);
	printtypename(l);
	Bprint(&outbuf, "\n");
	}
	Bprint(&outbuf, "}\n\n");
	break;

	default:
	Bprint(&outbuf, "/* %T */\n\n", t);
	break;
	}
	}

	void
	godefvar(Sym *s)
	{
	Type t, t1;
	char n;

	if(dontrun())
	return;

	t = s->type;
	if(t == nil)
	return;

	switch(t->etype) {
	case TENUM:
	if(!typefd[t->etype])
	Bprint(&outbuf, "const %s = %lld\n", s->name, s->vconst);
	else
	Bprint(&outbuf, "const %s = %f\n;", s->name, s->fconst);
	break;

	case TFUNC:
	Bprint(&outbuf, "func %U(", s->name);
	n = 'a';
	for(t1 = t->down; t1 != T; t1 = t1->down) {
	if(t1->etype == TVOID)
	break;
	if(t1 != t->down)
	Bprint(&outbuf, ", ");
	Bprint(&outbuf, "%c ", n++);
	printtypename(t1);
	}
	Bprint(&outbuf, ")");
	if(t->link && t->link->etype != TVOID) {
	Bprint(&outbuf, " ");
	printtypename(t->link);
	}
	Bprint(&outbuf, "\n");
	break;

	default:
	switch(s->class) {
	case CTYPEDEF:
	if(!typesu[t->etype]) {
	Bprint(&outbuf, "// type %U\t", s->name);
	printtypename(t);
	Bprint(&outbuf, "\n");
	}
	break;
	case CSTATIC:
	case CEXTERN:
	case CGLOBL:
	if(strchr(s->name, '$') != nil)
	break;
	if(strncmp(s->name, "go.weak.", 8) == 0)
	break;
	Bprint(&outbuf, "var %U\t", s->name);
	printtypename(t);
	Bprint(&outbuf, "\n");
	break;
	}
	break;
	}
	}