// Compiler implementation of the D programming language
// Copyright (c) 1999-2009 by Digital Mars
// All Rights Reserved
// written by Walter Bright
// http://www.digitalmars.com
// License for redistribution is by either the Artistic License
// in artistic.txt, or the GNU General Public License in gnu.txt.
// See the included readme.txt for details.

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>

#include "root.h"

#include "init.h"
#include "declaration.h"
#include "aggregate.h"
#include "mtype.h"
#include "attrib.h"
#include "template.h"
#include "id.h"
#include "module.h"

#if TARGET_LINUX || TARGET_OSX || TARGET_FREEBSD || TARGET_SOLARIS
char *cpp_mangle(Dsymbol *s);
#endif

char *mangle(Declaration *sthis)
{
    OutBuffer buf;
    char *id;
    Dsymbol *s;

    //printf("::mangle(%s)\n", sthis->toChars());
    s = sthis;
    do
    {
	//printf("mangle: s = %p, '%s', parent = %p\n", s, s->toChars(), s->parent);
	if (s->ident)
	{
	    FuncDeclaration *fd = s->isFuncDeclaration();
	    if (s != sthis && fd)
	    {
		id = mangle(fd);
		buf.prependstring(id);
		goto L1;
	    }
	    else
	    {
		id = s->ident->toChars();
		int len = strlen(id);
		char tmp[sizeof(len) * 3 + 1];
		buf.prependstring(id);
		sprintf(tmp, "%d", len);
		buf.prependstring(tmp);
	    }
	}
	else
	    buf.prependstring("0");
	s = s->parent;
    } while (s);

//    buf.prependstring("_D");
L1:
    //printf("deco = '%s'\n", sthis->type->deco ? sthis->type->deco : "null");
    //printf("sthis->type = %s\n", sthis->type->toChars());
    FuncDeclaration *fd = sthis->isFuncDeclaration();
    if (fd && (fd->needThis() || fd->isNested()))
	buf.writeByte(Type::needThisPrefix());
    if (sthis->type->deco)
	buf.writestring(sthis->type->deco);
    else
    {
#ifdef DEBUG
	if (!fd->inferRetType)
	    printf("%s\n", fd->toChars());
#endif
	assert(fd && fd->inferRetType);
    }

    id = buf.toChars();
    buf.data = NULL;
    return id;
}

char *Declaration::mangle()
#if __DMC__
    __out(result)
    {
	int len = strlen(result);

	assert(len > 0);
	//printf("mangle: '%s' => '%s'\n", toChars(), result);
	for (int i = 0; i < len; i++)
	{
	    assert(result[i] == '_' ||
		   result[i] == '@' ||
		   isalnum(result[i]) || result[i] & 0x80);
	}
    }
    __body
#endif
    {
	//printf("Declaration::mangle(this = %p, '%s', parent = '%s', linkage = %d)\n", this, toChars(), parent ? parent->toChars() : "null", linkage);
	if (!parent || parent->isModule())	// if at global scope
	{
	    // If it's not a D declaration, no mangling
	    switch (linkage)
	    {
		case LINKd:
		    break;

#if IN_LLVM
        case LINKintrinsic:
#endif
		case LINKc:
		case LINKwindows:
		case LINKpascal:
		    return ident->toChars();

		case LINKcpp:
#if DMDV2 && (TARGET_LINUX || TARGET_OSX || TARGET_FREEBSD || TARGET_SOLARIS)
		    return cpp_mangle(this);
#else
		    // Windows C++ mangling is done by C++ back end
		    return ident->toChars();
#endif

		case LINKdefault:
		    error("forward declaration");
		    return ident->toChars();

		default:
		    fprintf(stdmsg, "'%s', linkage = %d\n", toChars(), linkage);
		    assert(0);
	    }
	}
	char *p = ::mangle(this);
	OutBuffer buf;
	buf.writestring("_D");
	buf.writestring(p);
	p = buf.toChars();
	buf.data = NULL;
	//printf("Declaration::mangle(this = %p, '%s', parent = '%s', linkage = %d) = %s\n", this, toChars(), parent ? parent->toChars() : "null", linkage, p);
	return p;
    }

char *FuncDeclaration::mangle()
#if __DMC__
    __out(result)
    {
	assert(strlen(result) > 0);
    }
    __body
#endif
    {
	if (isMain())
	    return (char *)"_Dmain";

	if (isWinMain() || isDllMain())
	    return ident->toChars();

	assert(this);
	return Declaration::mangle();
    }

char *StructDeclaration::mangle()
{
    //printf("StructDeclaration::mangle() '%s'\n", toChars());
    return Dsymbol::mangle();
}


char *TypedefDeclaration::mangle()
{
    //printf("TypedefDeclaration::mangle() '%s'\n", toChars());
    return Dsymbol::mangle();
}


char *ClassDeclaration::mangle()
{
    Dsymbol *parentsave = parent;

    //printf("ClassDeclaration::mangle() %s.%s\n", parent->toChars(), toChars());

    /* These are reserved to the compiler, so keep simple
     * names for them.
     */
    if (ident == Id::Exception)
    {	if (parent->ident == Id::object)
	    parent = NULL;
    }
    else if (ident == Id::TypeInfo   ||
//	ident == Id::Exception ||
	ident == Id::TypeInfo_Struct   ||
	ident == Id::TypeInfo_Class    ||
	ident == Id::TypeInfo_Typedef  ||
	ident == Id::TypeInfo_Tuple ||
	this == object     ||
	this == classinfo  ||
	this == Module::moduleinfo ||
	memcmp(ident->toChars(), "TypeInfo_", 9) == 0
       )
	parent = NULL;

    char *id = Dsymbol::mangle();
    parent = parentsave;
    return id;
}


char *TemplateInstance::mangle()
{
    OutBuffer buf;
    char *id;

#if 0
    printf("TemplateInstance::mangle() %s", toChars());
    if (parent)
	printf("  parent = %s %s", parent->kind(), parent->toChars());
    printf("\n");
#endif
    id = ident ? ident->toChars() : toChars();
    if (!tempdecl)
	error("is not defined");
    else if (tempdecl->parent)
    {
	char *p = tempdecl->parent->mangle();
	if (p[0] == '_' && p[1] == 'D')
	    p += 2;
	buf.writestring(p);
    }
    buf.printf("%zu%s", strlen(id), id);
    id = buf.toChars();
    buf.data = NULL;
    //printf("TemplateInstance::mangle() %s = %s\n", toChars(), id);
    return id;
}


char *TemplateMixin::mangle()
{
    OutBuffer buf;
    char *id;

#if 0
    printf("TemplateMixin::mangle() %s", toChars());
    if (parent)
        printf("  parent = %s %s", parent->kind(), parent->toChars());
    printf("\n");
#endif
    id = ident ? ident->toChars() : toChars();
    if (parent)
    {
	char *p = parent->mangle();
	if (p[0] == '_' && p[1] == 'D')
	    p += 2;
	buf.writestring(p);
    }
    buf.printf("%zu%s", strlen(id), id);
    id = buf.toChars();
    buf.data = NULL;
    //printf("TemplateMixin::mangle() %s = %s\n", toChars(), id);
    return id;
}

char *Dsymbol::mangle()
{
    OutBuffer buf;
    char *id;

#if 0
    printf("Dsymbol::mangle() '%s'", toChars());
    if (parent)
	printf("  parent = %s %s", parent->kind(), parent->toChars());
    printf("\n");
#endif
    id = ident ? ident->toChars() : toChars();
    if (parent)
    {
	char *p = parent->mangle();
	if (p[0] == '_' && p[1] == 'D')
	    p += 2;
	buf.writestring(p);
    }
    buf.printf("%zu%s", strlen(id), id);
    id = buf.toChars();
    buf.data = NULL;
    //printf("Dsymbol::mangle() %s = %s\n", toChars(), id);
    return id;
}