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module.c

// 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 <stdlib.h>
#include <assert.h>

#if (defined (__SVR4) && defined (__sun))
#include <alloca.h>
#endif

#if defined(_MSC_VER) || defined(__MINGW32__)
#include <malloc.h>
#endif

#if IN_GCC
#include "gdc_alloca.h"
#endif

#include "rmem.h"

#include "mars.h"
#include "module.h"
#include "parse.h"
#include "scope.h"
#include "identifier.h"
#include "id.h"
#include "import.h"
#include "dsymbol.h"
#include "hdrgen.h"
#include "lexer.h"

#define MARS 1
#include "html.h"

#ifdef IN_GCC
#include "d-dmd-gcc.h"
#endif

#if IN_LLVM
#include "llvm/Support/CommandLine.h"

static llvm::cl::opt<bool> preservePaths("op",
    llvm::cl::desc("Do not strip paths from source file"),
    llvm::cl::ZeroOrMore);

static llvm::cl::opt<bool> fqnNames("oq",
    llvm::cl::desc("Write object files with fully qualified names"),
    llvm::cl::ZeroOrMore);
#endif

ClassDeclaration *Module::moduleinfo;

Module *Module::rootModule;
DsymbolTable *Module::modules;
Array Module::amodules;

Array Module::deferred; // deferred Dsymbol's needing semantic() run on them
unsigned Module::dprogress;

void Module::init()
{
    modules = new DsymbolTable();
}

Module::Module(char *filename, Identifier *ident, int doDocComment, int doHdrGen)
      : Package(ident)
{
    FileName *srcfilename;
#if IN_DMD
    FileName *cfilename;
    FileName *hfilename;
    FileName *objfilename;
    FileName *symfilename;
#endif

//    printf("Module::Module(filename = '%s', ident = '%s')\n", filename, ident->toChars());
    this->arg = filename;
    md = NULL;
    errors = 0;
    numlines = 0;
    members = NULL;
    isHtml = 0;
    isDocFile = 0;
    needmoduleinfo = 0;
#ifdef IN_GCC
    strictlyneedmoduleinfo = 0;
#endif
    selfimports = 0;
    insearch = 0;
    searchCacheIdent = NULL;
    searchCacheSymbol = NULL;
    searchCacheFlags = 0;
    semanticstarted = 0;
    semanticRun = 0;
    decldefs = NULL;
    vmoduleinfo = NULL;
#if IN_DMD
    massert = NULL;
    marray = NULL;
    sictor = NULL;
    sctor = NULL;
    sdtor = NULL;
    stest = NULL;
    sfilename = NULL;
#endif
    root = 0;
    importedFrom = NULL;
    srcfile = NULL;
    objfile = NULL;
    docfile = NULL;
    hdrfile = NULL;

    debuglevel = 0;
    debugids = NULL;
    debugidsNot = NULL;
    versionlevel = 0;
    versionids = NULL;
    versionidsNot = NULL;

    macrotable = NULL;
    escapetable = NULL;
    safe = FALSE;
#if IN-DMD
    doppelganger = 0;
    cov = NULL;
    covb = NULL;
#endif

    srcfilename = FileName::defaultExt(filename, global.mars_ext);
    if (!srcfilename->equalsExt(global.mars_ext) &&
        !srcfilename->equalsExt(global.hdr_ext) &&
        !srcfilename->equalsExt("dd"))
    {
      if (srcfilename->equalsExt("html") ||
          srcfilename->equalsExt("htm")  ||
          srcfilename->equalsExt("xhtml"))
      {   if (!global.params.useDeprecated)
            error("html source files is deprecated %s", srcfilename->toChars());
          isHtml = 1;
      }
      else
      {   error("source file name '%s' must have .%s extension", srcfilename->toChars(), global.mars_ext);
          fatal();
      }
    }
#if !IN_LLVM
    char *argobj;
    if (global.params.objname)
      argobj = global.params.objname;
    else if (global.params.preservePaths)
      argobj = filename;
    else
      argobj = FileName::name(filename);
    if (!FileName::absolute(argobj))
    {
      argobj = FileName::combine(global.params.objdir, argobj);
    }

    if (global.params.objname)
      objfilename = new FileName(argobj, 0);
    else
      objfilename = FileName::forceExt(argobj, global.obj_ext);

    symfilename = FileName::forceExt(filename, global.sym_ext);
#endif

    srcfile = new File(srcfilename);
#if IN_DMD
    if (doDocComment)
    {
      setDocfile();
    }

    if (doHdrGen)
    {
      setHdrfile();
    }

    objfile = new File(objfilename);
    symfile = new File(symfilename);
#endif
#if IN_LLVM
    // LDC
    llvmForceLogging = false;
    this->doDocComment = doDocComment;
    this->doHdrGen = doHdrGen;
#endif
}
#if IN_LLVM
File* Module::buildFilePath(const char* forcename, const char* path, const char* ext)
{
    const char *argobj;
    if (forcename)
      argobj = forcename;
    else
    {
      if (preservePaths)
          argobj = (char*)this->arg;
      else
          argobj = FileName::name((char*)this->arg);

      if (fqnNames)
      {
          if(md)
            argobj = FileName::replaceName((char*)argobj, md->toChars());
          else
            argobj = FileName::replaceName((char*)argobj, toChars());

          // add ext, otherwise forceExt will make nested.module into nested.bc
          size_t len = strlen(argobj);
          size_t extlen = strlen(ext);
          char* s = (char *)alloca(len + 1 + extlen + 1);
          memcpy(s, argobj, len);
          s[len] = '.';
          memcpy(s + len + 1, ext, extlen + 1);
          s[len+1+extlen] = 0;
          argobj = s;
      }
    }

    if (!FileName::absolute(argobj))
    {
      argobj = FileName::combine(path, argobj);
    }

    FileName::ensurePathExists(FileName::path(argobj));

// always append the extension! otherwise hard to make output switches consistent
//    if (forcename)
//    return new File(argobj);
//    else
    // allow for .o and .obj on windows
#if _WIN32
    if (ext == global.params.objdir && FileName::ext(argobj) 
          && stricmp(FileName::ext(argobj), global.obj_ext_alt) == 0)
      return new File((char*)argobj);
#endif
    return new File(FileName::forceExt(argobj, ext));
}
#endif
#if IN_DMD
void Module::setDocfile()
{
    FileName *docfilename;
    char *argdoc;

    if (global.params.docname)
      argdoc = global.params.docname;
    else if (global.params.preservePaths)
      argdoc = (char *)arg;
    else
      argdoc = FileName::name((char *)arg);
    if (!FileName::absolute(argdoc))
    { //FileName::ensurePathExists(global.params.docdir);
      argdoc = FileName::combine(global.params.docdir, argdoc);
    }
    if (global.params.docname)
      docfilename = new FileName(argdoc, 0);
    else
      docfilename = FileName::forceExt(argdoc, global.doc_ext);

    if (docfilename->equals(srcfile->name))
    {   error("Source file and documentation file have same name '%s'", srcfile->name->str);
      fatal();
    }

    docfile = new File(docfilename);
}

void Module::setHdrfile()
{
    FileName *hdrfilename;
    char *arghdr;

    if (global.params.hdrname)
      arghdr = global.params.hdrname;
    else if (global.params.preservePaths)
      arghdr = (char *)arg;
    else
      arghdr = FileName::name((char *)arg);
    if (!FileName::absolute(arghdr))
    { //FileName::ensurePathExists(global.params.hdrdir);
      arghdr = FileName::combine(global.params.hdrdir, arghdr);
    }
    if (global.params.hdrname)
      hdrfilename = new FileName(arghdr, 0);
    else
      hdrfilename = FileName::forceExt(arghdr, global.hdr_ext);

    if (hdrfilename->equals(srcfile->name))
    {   error("Source file and 'header' file have same name '%s'", srcfile->name->str);
      fatal();
    }

    hdrfile = new File(hdrfilename);
}
#endif

#if IN_LLVM
void Module::buildTargetFiles()
{
    if(objfile && 
       (!doDocComment || docfile) && 
       (!doHdrGen || hdrfile))
      return;

    if(!objfile)
      objfile = Module::buildFilePath(global.params.objname, global.params.objdir, global.obj_ext);
    if(doDocComment && !docfile)
      docfile = Module::buildFilePath(global.params.docname, global.params.docdir, global.doc_ext);
    if(doHdrGen && !hdrfile)
      hdrfile = Module::buildFilePath(global.params.hdrname, global.params.hdrdir, global.hdr_ext);

    // safety check: never allow obj, doc or hdr file to have the source file's name
    if(stricmp(FileName::name(objfile->name->str), FileName::name((char*)this->arg)) == 0)
    {
      error("Output object files with the same name as the source file are forbidden");
      fatal();
    }
    if(docfile && stricmp(FileName::name(docfile->name->str), FileName::name((char*)this->arg)) == 0)
    {
      error("Output doc files with the same name as the source file are forbidden");
      fatal();
    }
    if(hdrfile && stricmp(FileName::name(hdrfile->name->str), FileName::name((char*)this->arg)) == 0)
    {
      error("Output header files with the same name as the source file are forbidden");
      fatal();
    }
}
#endif
void Module::deleteObjFile()
{
    if (global.params.obj)
      objfile->remove();
    //if (global.params.llvmBC)
    //bcfile->remove();
    if (doDocComment && docfile)
      docfile->remove();
}

Module::~Module()
{
}

const char *Module::kind()
{
    return "module";
}

Module *Module::load(Loc loc, Array *packages, Identifier *ident)
{   Module *m;
    char *filename;

    //printf("Module::load(ident = '%s')\n", ident->toChars());

    // Build module filename by turning:
    //      foo.bar.baz
    // into:
    //      foo\bar\baz
    filename = ident->toChars();
    if (packages && packages->dim)
    {
      OutBuffer buf;
      int i;

      for (i = 0; i < packages->dim; i++)
      {   Identifier *pid = (Identifier *)packages->data[i];

          buf.writestring(pid->toChars());
#if _WIN32
          buf.writeByte('\\');
#else
          buf.writeByte('/');
#endif
      }
      buf.writestring(filename);
      buf.writeByte(0);
      filename = (char *)buf.extractData();
    }

    m = new Module(filename, ident, 0, 0);
    m->loc = loc;

    /* Search along global.path for .di file, then .d file.
     */
    char *result = NULL;
    FileName *fdi = FileName::forceExt(filename, global.hdr_ext);
    FileName *fd  = FileName::forceExt(filename, global.mars_ext);
    char *sdi = fdi->toChars();
    char *sd  = fd->toChars();

    if (FileName::exists(sdi))
      result = sdi;
    else if (FileName::exists(sd))
      result = sd;
    else if (FileName::absolute(filename))
      ;
    else if (!global.path)
      ;
    else
    {
      for (size_t i = 0; i < global.path->dim; i++)
      {
          char *p = (char *)global.path->data[i];
          char *n = FileName::combine(p, sdi);
          if (FileName::exists(n))
          { result = n;
            break;
          }
          mem.free(n);
          n = FileName::combine(p, sd);
          if (FileName::exists(n))
          { result = n;
            break;
          }
          mem.free(n);
      }
    }
    if (result)
      m->srcfile = new File(result);

    if (global.params.verbose)
    {
      printf("import    ");
      if (packages)
      {
          for (size_t i = 0; i < packages->dim; i++)
          {   Identifier *pid = (Identifier *)packages->data[i];
            printf("%s.", pid->toChars());
          }
      }
      printf("%s\t(%s)\n", ident->toChars(), m->srcfile->toChars());
    }

    m->read(loc);
    m->parse();

#ifdef IN_GCC
    d_gcc_magic_module(m);
#endif

    return m;
}

void Module::read(Loc loc)
{
    //printf("Module::read('%s') file '%s'\n", toChars(), srcfile->toChars());
    if (srcfile->read())
    { error(loc, "cannot read file '%s'", srcfile->toChars());
      fatal();
    }
}

inline unsigned readwordLE(unsigned short *p)
{
#if __I86__
    return *p;
#else
    return (((unsigned char *)p)[1] << 8) | ((unsigned char *)p)[0];
#endif
}

inline unsigned readwordBE(unsigned short *p)
{
    return (((unsigned char *)p)[0] << 8) | ((unsigned char *)p)[1];
}

inline unsigned readlongLE(unsigned *p)
{
#if __I86__
    return *p;
#else
    return ((unsigned char *)p)[0] |
      (((unsigned char *)p)[1] << 8) |
      (((unsigned char *)p)[2] << 16) |
      (((unsigned char *)p)[3] << 24);
#endif
}

inline unsigned readlongBE(unsigned *p)
{
    return ((unsigned char *)p)[3] |
      (((unsigned char *)p)[2] << 8) |
      (((unsigned char *)p)[1] << 16) |
      (((unsigned char *)p)[0] << 24);
}

#if IN_GCC
void Module::parse(bool dump_source)
#else
void Module::parse()
#endif
{   char *srcname;
    unsigned char *buf;
    unsigned buflen;
    unsigned le;
    unsigned bom;

    //printf("Module::parse()\n");

    srcname = srcfile->name->toChars();
    //printf("Module::parse(srcname = '%s')\n", srcname);

    buf = srcfile->buffer;
    buflen = srcfile->len;

    if (buflen >= 2)
    {
      /* Convert all non-UTF-8 formats to UTF-8.
       * BOM : http://www.unicode.org/faq/utf_bom.html
       * 00 00 FE FF    UTF-32BE, big-endian
       * FF FE 00 00    UTF-32LE, little-endian
       * FE FF    UTF-16BE, big-endian
       * FF FE    UTF-16LE, little-endian
       * EF BB BF UTF-8
       */

      bom = 1;          // assume there's a BOM
      if (buf[0] == 0xFF && buf[1] == 0xFE)
      {
          if (buflen >= 4 && buf[2] == 0 && buf[3] == 0)
          { // UTF-32LE
            le = 1;

          Lutf32:
            OutBuffer dbuf;
            unsigned *pu = (unsigned *)(buf);
            unsigned *pumax = &pu[buflen / 4];

            if (buflen & 3)
            {   error("odd length of UTF-32 char source %u", buflen);
                fatal();
            }

            dbuf.reserve(buflen / 4);
            for (pu += bom; pu < pumax; pu++)
            {   unsigned u;

                u = le ? readlongLE(pu) : readlongBE(pu);
                if (u & ~0x7F)
                {
                  if (u > 0x10FFFF)
                  {   error("UTF-32 value %08x greater than 0x10FFFF", u);
                      fatal();
                  }
                  dbuf.writeUTF8(u);
                }
                else
                  dbuf.writeByte(u);
            }
            dbuf.writeByte(0);            // add 0 as sentinel for scanner
            buflen = dbuf.offset - 1;     // don't include sentinel in count
            buf = (unsigned char *) dbuf.extractData();
          }
          else
          {   // UTF-16LE (X86)
            // Convert it to UTF-8
            le = 1;

          Lutf16:
            OutBuffer dbuf;
            unsigned short *pu = (unsigned short *)(buf);
            unsigned short *pumax = &pu[buflen / 2];

            if (buflen & 1)
            {   error("odd length of UTF-16 char source %u", buflen);
                fatal();
            }

            dbuf.reserve(buflen / 2);
            for (pu += bom; pu < pumax; pu++)
            {   unsigned u;

                u = le ? readwordLE(pu) : readwordBE(pu);
                if (u & ~0x7F)
                { if (u >= 0xD800 && u <= 0xDBFF)
                  {   unsigned u2;

                      if (++pu > pumax)
                      {   error("surrogate UTF-16 high value %04x at EOF", u);
                        fatal();
                      }
                      u2 = le ? readwordLE(pu) : readwordBE(pu);
                      if (u2 < 0xDC00 || u2 > 0xDFFF)
                      {   error("surrogate UTF-16 low value %04x out of range", u2);
                        fatal();
                      }
                      u = (u - 0xD7C0) << 10;
                      u |= (u2 - 0xDC00);
                  }
                  else if (u >= 0xDC00 && u <= 0xDFFF)
                  {   error("unpaired surrogate UTF-16 value %04x", u);
                      fatal();
                  }
                  else if (u == 0xFFFE || u == 0xFFFF)
                  {   error("illegal UTF-16 value %04x", u);
                      fatal();
                  }
                  dbuf.writeUTF8(u);
                }
                else
                  dbuf.writeByte(u);
            }
            dbuf.writeByte(0);            // add 0 as sentinel for scanner
            buflen = dbuf.offset - 1;     // don't include sentinel in count
            buf = (unsigned char *) dbuf.extractData();
          }
      }
      else if (buf[0] == 0xFE && buf[1] == 0xFF)
      {   // UTF-16BE
          le = 0;
          goto Lutf16;
      }
      else if (buflen >= 4 && buf[0] == 0 && buf[1] == 0 && buf[2] == 0xFE && buf[3] == 0xFF)
      {   // UTF-32BE
          le = 0;
          goto Lutf32;
      }
      else if (buflen >= 3 && buf[0] == 0xEF && buf[1] == 0xBB && buf[2] == 0xBF)
      {   // UTF-8

          buf += 3;
          buflen -= 3;
      }
      else
      {
          /* There is no BOM. Make use of Arcane Jill's insight that
           * the first char of D source must be ASCII to
           * figure out the encoding.
           */

          bom = 0;
          if (buflen >= 4)
          {   if (buf[1] == 0 && buf[2] == 0 && buf[3] == 0)
            {   // UTF-32LE
                le = 1;
                goto Lutf32;
            }
            else if (buf[0] == 0 && buf[1] == 0 && buf[2] == 0)
            {   // UTF-32BE
                le = 0;
                goto Lutf32;
            }
          }
          if (buflen >= 2)
          {
            if (buf[1] == 0)
            {   // UTF-16LE
                le = 1;
                goto Lutf16;
            }
            else if (buf[0] == 0)
            {   // UTF-16BE
                le = 0;
                goto Lutf16;
            }
          }

          // It's UTF-8
          if (buf[0] >= 0x80)
          { error("source file must start with BOM or ASCII character, not \\x%02X", buf[0]);
            fatal();
          }
      }
    }

#ifdef IN_GCC
    // dump utf-8 encoded source 
    if (dump_source)
    { // %% srcname could contain a path ...
      d_gcc_dump_source(srcname, "utf-8", buf, buflen);
    }
#endif

    /* If it starts with the string "Ddoc", then it's a documentation
     * source file.
     */
    if (buflen >= 4 && memcmp(buf, "Ddoc", 4) == 0)
    {
      comment = buf + 4;
      isDocFile = 1;
#if IN_DMD
      if (!docfile)
          setDocfile();
#endif
      return;
    }
    if (isHtml)
    {
      OutBuffer *dbuf = new OutBuffer();
      Html h(srcname, buf, buflen);
      h.extractCode(dbuf);
      buf = dbuf->data;
      buflen = dbuf->offset;
#ifdef IN_GCC
      // dump extracted source
      if (dump_source)
          d_gcc_dump_source(srcname, "d.utf-8", buf, buflen);
#endif
    }
    Parser p(this, buf, buflen, docfile != NULL);
    p.nextToken();
    members = p.parseModule();
    md = p.md;
    numlines = p.loc.linnum;

    DsymbolTable *dst;

    if (md)
    { this->ident = md->id;
      this->safe = md->safe;
      dst = Package::resolve(md->packages, &this->parent, NULL);
    }
    else
    {
      dst = modules;

      /* Check to see if module name is a valid identifier
       */
      if (!Lexer::isValidIdentifier(this->ident->toChars()))
          error("has non-identifier characters in filename, use module declaration instead");
    }

    // Update global list of modules
    if (!dst->insert(this))
    {
      if (md)
          error(loc, "is in multiple packages %s", md->toChars());
      else
          error(loc, "is in multiple defined");
    }
    else
    {
      amodules.push(this);
    }
}

void Module::semantic(Scope* unused_sc)
{   int i;

    if (semanticstarted)
      return;

    //printf("+Module::semantic(this = %p, '%s'): parent = %p\n", this, toChars(), parent);
    semanticstarted = 1;

    // Note that modules get their own scope, from scratch.
    // This is so regardless of where in the syntax a module
    // gets imported, it is unaffected by context.
    Scope *sc = Scope::createGlobal(this);      // create root scope

    //printf("Module = %p, linkage = %d\n", sc->scopesym, sc->linkage);

    // Add import of "object" if this module isn't "object"
    if (ident != Id::object)
    {
      Import *im = new Import(0, NULL, Id::object, NULL, 0);
      members->shift(im);
    }

    // Add all symbols into module's symbol table
    symtab = new DsymbolTable();
    for (i = 0; i < members->dim; i++)
    { Dsymbol *s = (Dsymbol *)members->data[i];
      s->addMember(NULL, sc->scopesym, 1);
    }

    /* Set scope for the symbols so that if we forward reference
     * a symbol, it can possibly be resolved on the spot.
     * If this works out well, it can be extended to all modules
     * before any semantic() on any of them.
     */
    for (i = 0; i < members->dim; i++)
    { Dsymbol *s = (Dsymbol *)members->data[i];
      s->setScope(sc);
    }

    // Pass 1 semantic routines: do public side of the definition
    for (i = 0; i < members->dim; i++)
    { Dsymbol *s = (Dsymbol *)members->data[i];

      //printf("\tModule('%s'): '%s'.semantic()\n", toChars(), s->toChars());
      s->semantic(sc);
      runDeferredSemantic();
    }

    sc = sc->pop();
    sc->pop();          // 2 pops because Scope::createGlobal() created 2
    semanticRun = semanticstarted;
    //printf("-Module::semantic(this = %p, '%s'): parent = %p\n", this, toChars(), parent);
}

void Module::semantic2(Scope* unused_sc)
{   int i;

    if (deferred.dim)
    {
      for (int i = 0; i < deferred.dim; i++)
      {
          Dsymbol *sd = (Dsymbol *)deferred.data[i];

          sd->error("unable to resolve forward reference in definition");
      }
      return;
    }
    //printf("Module::semantic2('%s'): parent = %p\n", toChars(), parent);
    if (semanticstarted >= 2)
      return;
    assert(semanticstarted == 1);
    semanticstarted = 2;

    // Note that modules get their own scope, from scratch.
    // This is so regardless of where in the syntax a module
    // gets imported, it is unaffected by context.
    Scope *sc = Scope::createGlobal(this);      // create root scope
    //printf("Module = %p\n", sc.scopesym);

    // Pass 2 semantic routines: do initializers and function bodies
    for (i = 0; i < members->dim; i++)
    { Dsymbol *s;

      s = (Dsymbol *)members->data[i];
      s->semantic2(sc);
    }

    sc = sc->pop();
    sc->pop();
    semanticRun = semanticstarted;
    //printf("-Module::semantic2('%s'): parent = %p\n", toChars(), parent);
}

void Module::semantic3(Scope* unused_sc)
{   int i;

    //printf("Module::semantic3('%s'): parent = %p\n", toChars(), parent);
    if (semanticstarted >= 3)
      return;
    assert(semanticstarted == 2);
    semanticstarted = 3;

    // Note that modules get their own scope, from scratch.
    // This is so regardless of where in the syntax a module
    // gets imported, it is unaffected by context.
    Scope *sc = Scope::createGlobal(this);      // create root scope
    //printf("Module = %p\n", sc.scopesym);

    // Pass 3 semantic routines: do initializers and function bodies
    for (i = 0; i < members->dim; i++)
    { Dsymbol *s;

      s = (Dsymbol *)members->data[i];
      //printf("Module %s: %s.semantic3()\n", toChars(), s->toChars());
      s->semantic3(sc);
    }

    sc = sc->pop();
    sc->pop();
    semanticRun = semanticstarted;
}

void Module::inlineScan()
{   int i;

    if (semanticstarted >= 4)
      return;
    assert(semanticstarted == 3);
    semanticstarted = 4;

    // Note that modules get their own scope, from scratch.
    // This is so regardless of where in the syntax a module
    // gets imported, it is unaffected by context.
    //printf("Module = %p\n", sc.scopesym);

    for (i = 0; i < members->dim; i++)
    { Dsymbol *s;

      s = (Dsymbol *)members->data[i];
      //if (global.params.verbose)
          //printf("inline scan symbol %s\n", s->toChars());

      s->inlineScan();
    }
    semanticRun = semanticstarted;
}

/****************************************************
 */

// is this used anywhere?
/*
void Module::gensymfile()
{
    OutBuffer buf;
    HdrGenState hgs;

    //printf("Module::gensymfile()\n");

    buf.printf("// Sym file generated from '%s'", srcfile->toChars());
    buf.writenl();

    for (int i = 0; i < members->dim; i++)
    { Dsymbol *s = (Dsymbol *)members->data[i];

      s->toCBuffer(&buf, &hgs);
    }

    // Transfer image to file
    symfile->setbuffer(buf.data, buf.offset);
    buf.data = NULL;

    symfile->writev();
}*/

/**********************************
 * Determine if we need to generate an instance of ModuleInfo
 * for this Module.
 */

int Module::needModuleInfo()
{
    return needmoduleinfo;
}

Dsymbol *Module::search(Loc loc, Identifier *ident, int flags)
{
    /* Since modules can be circularly referenced,
     * need to stop infinite recursive searches.
     */

    //printf("%s Module::search('%s', flags = %d) insearch = %d\n", toChars(), ident->toChars(), flags, insearch);
    Dsymbol *s;
    if (insearch)
      s = NULL;
    else if (searchCacheIdent == ident && searchCacheFlags == flags)
      s = searchCacheSymbol;
    else
    {
      insearch = 1;
      s = ScopeDsymbol::search(loc, ident, flags);
      insearch = 0;

      searchCacheIdent = ident;
      searchCacheSymbol = s;
      searchCacheFlags = flags;
    }
    return s;
}

/*******************************************
 * Can't run semantic on s now, try again later.
 */

void Module::addDeferredSemantic(Dsymbol *s)
{
    // Don't add it if it is already there
    for (int i = 0; i < deferred.dim; i++)
    {
      Dsymbol *sd = (Dsymbol *)deferred.data[i];

      if (sd == s)
          return;
    }

    //printf("Module::addDeferredSemantic('%s')\n", s->toChars());
    deferred.push(s);
}


/******************************************
 * Run semantic() on deferred symbols.
 */

void Module::runDeferredSemantic()
{
    size_t len;

    static int nested;
    if (nested)
      return;
    //if (deferred.dim) printf("+Module::runDeferredSemantic('%s'), len = %d\n", toChars(), deferred.dim);
    nested++;

    do
    {
      dprogress = 0;
      len = deferred.dim;
      if (!len)
          break;

      Dsymbol **todo;
      Dsymbol *tmp;
      if (len == 1)
      {
          todo = &tmp;
      }
      else
      {
          todo = (Dsymbol **)alloca(len * sizeof(Dsymbol *));
          assert(todo);
      }
      memcpy(todo, deferred.data, len * sizeof(Dsymbol *));
      deferred.setDim(0);

      for (int i = 0; i < len; i++)
      {
          Dsymbol *s = todo[i];

          s->semantic(NULL);
          //printf("deferred: %s, parent = %s\n", s->toChars(), s->parent->toChars());
      }
      //printf("\tdeferred.dim = %d, len = %d, dprogress = %d\n", deferred.dim, len, dprogress);
    } while (deferred.dim < len || dprogress);  // while making progress
    nested--;
    //printf("-Module::runDeferredSemantic('%s'), len = %d\n", toChars(), deferred.dim);
}

/************************************
 * Recursively look at every module this module imports,
 * return TRUE if it imports m.
 * Can be used to detect circular imports.
 */

int Module::imports(Module *m)
{
    //printf("%s Module::imports(%s)\n", toChars(), m->toChars());
    int aimports_dim = aimports.dim;
#if 0
    for (int i = 0; i < aimports.dim; i++)
    { Module *mi = (Module *)aimports.data[i];
      printf("\t[%d] %s\n", i, mi->toChars());
    }
#endif
    for (int i = 0; i < aimports.dim; i++)
    { Module *mi = (Module *)aimports.data[i];
      if (mi == m)
          return TRUE;
      if (!mi->insearch)
      {
          mi->insearch = 1;
          int r = mi->imports(m);
          if (r)
            return r;
      }
    }
    return FALSE;
}

/*************************************
 * Return !=0 if module imports itself.
 */

int Module::selfImports()
{
    //printf("Module::selfImports() %s\n", toChars());
    if (!selfimports)
    {
      for (int i = 0; i < amodules.dim; i++)
      {   Module *mi = (Module *)amodules.data[i];
          //printf("\t[%d] %s\n", i, mi->toChars());
          mi->insearch = 0;
      }

      selfimports = imports(this) + 1;

      for (int i = 0; i < amodules.dim; i++)
      {   Module *mi = (Module *)amodules.data[i];
          //printf("\t[%d] %s\n", i, mi->toChars());
          mi->insearch = 0;
      }
    }
    return selfimports - 1;
}


/* =========================== ModuleDeclaration ===================== */

ModuleDeclaration::ModuleDeclaration(Array *packages, Identifier *id, bool safe)
{
    this->packages = packages;
    this->id = id;
    this->safe = safe;
}

char *ModuleDeclaration::toChars()
{
    OutBuffer buf;
    int i;

    if (packages && packages->dim)
    {
      for (i = 0; i < packages->dim; i++)
      {   Identifier *pid = (Identifier *)packages->data[i];

          buf.writestring(pid->toChars());
          buf.writeByte('.');
      }
    }
    buf.writestring(id->toChars());
    buf.writeByte(0);
    return (char *)buf.extractData();
}

/* =========================== Package ===================== */

Package::Package(Identifier *ident)
      : ScopeDsymbol(ident)
{
}


const char *Package::kind()
{
    return "package";
}


DsymbolTable *Package::resolve(Array *packages, Dsymbol **pparent, Package **ppkg)
{
    DsymbolTable *dst = Module::modules;
    Dsymbol *parent = NULL;

    //printf("Package::resolve()\n");
    if (ppkg)
      *ppkg = NULL;

    if (packages)
    {   int i;

      for (i = 0; i < packages->dim; i++)
      {   Identifier *pid = (Identifier *)packages->data[i];
          Dsymbol *p;

          p = dst->lookup(pid);
          if (!p)
          {
            p = new Package(pid);
            dst->insert(p);
            p->parent = parent;
            ((ScopeDsymbol *)p)->symtab = new DsymbolTable();
          }
          else
          {
            assert(p->isPackage());
#if TARGET_NET  //dot net needs modules and packages with same name
#else
            if (p->isModule())
            {   p->error("module and package have the same name");
                fatal();
                break;
            }
#endif
          }
          parent = p;
          dst = ((Package *)p)->symtab;
          if (ppkg && !*ppkg)
            *ppkg = (Package *)p;
      }
      if (pparent)
      {
          *pparent = parent;
      }
    }
    return dst;
}

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