/*
 * File module.c - module handling for the wine debugger
 *
 * Copyright (C) 1993,      Eric Youngdale.
 * 		 2000-2007, Eric Pouech
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

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

#include "dbghelp_private.h"
#include "image_private.h"
#include "psapi.h"
#include "winternl.h"
#include "wine/debug.h"
#include "wine/heap.h"

WINE_DEFAULT_DEBUG_CHANNEL(dbghelp);

#define NOTE_GNU_BUILD_ID  3

const WCHAR        S_ElfW[]         = {'<','e','l','f','>','\0'};
const WCHAR        S_WineLoaderW[]  = {'<','w','i','n','e','-','l','o','a','d','e','r','>','\0'};
static const WCHAR S_DotSoW[]       = {'.','s','o','\0'};
const WCHAR        S_SlashW[]       = {'/','\0'};

static const WCHAR S_AcmW[] = {'.','a','c','m','\0'};
static const WCHAR S_DllW[] = {'.','d','l','l','\0'};
static const WCHAR S_DrvW[] = {'.','d','r','v','\0'};
static const WCHAR S_ExeW[] = {'.','e','x','e','\0'};
static const WCHAR S_OcxW[] = {'.','o','c','x','\0'};
static const WCHAR S_VxdW[] = {'.','v','x','d','\0'};
static const WCHAR * const ext[] = {S_AcmW, S_DllW, S_DrvW, S_ExeW, S_OcxW, S_VxdW, NULL};

static int match_ext(const WCHAR* ptr, size_t len)
{
    const WCHAR* const *e;
    size_t      l;

    for (e = ext; *e; e++)
    {
        l = lstrlenW(*e);
        if (l >= len) return 0;
        if (wcsnicmp(&ptr[len - l], *e, l)) continue;
        return l;
    }
    return 0;
}

static const WCHAR* get_filename(const WCHAR* name, const WCHAR* endptr)
{
    const WCHAR*        ptr;

    if (!endptr) endptr = name + lstrlenW(name);
    for (ptr = endptr - 1; ptr >= name; ptr--)
    {
        if (*ptr == '/' || *ptr == '\\') break;
    }
    return ++ptr;
}

static BOOL is_wine_loader(const WCHAR *module)
{
    static const WCHAR wineW[] = {'w','i','n','e',0};
    static const WCHAR suffixW[] = {'6','4',0};
    const WCHAR *filename = get_filename(module, NULL);
    const char *ptr;
    BOOL ret = FALSE;
    WCHAR *buffer;
    DWORD len;

    if ((ptr = getenv("WINELOADER")))
    {
        ptr = file_nameA(ptr);
        len = 2 + MultiByteToWideChar( CP_UNIXCP, 0, ptr, -1, NULL, 0 );
        buffer = heap_alloc( len * sizeof(WCHAR) );
        MultiByteToWideChar( CP_UNIXCP, 0, ptr, -1, buffer, len );
    }
    else
    {
        buffer = heap_alloc( sizeof(wineW) + 2 * sizeof(WCHAR) );
        lstrcpyW( buffer, wineW );
    }

    if (!wcscmp( filename, buffer ))
        ret = TRUE;

    lstrcatW( buffer, suffixW );
    if (!wcscmp( filename, buffer ))
        ret = TRUE;

    heap_free( buffer );
    return ret;
}

static void module_fill_module(const WCHAR* in, WCHAR* out, size_t size)
{
    const WCHAR *ptr, *endptr;
    size_t      len, l;

    ptr = get_filename(in, endptr = in + lstrlenW(in));
    len = min(endptr - ptr, size - 1);
    memcpy(out, ptr, len * sizeof(WCHAR));
    out[len] = '\0';
    if (len > 4 && (l = match_ext(out, len)))
        out[len - l] = '\0';
    else if (is_wine_loader(out))
        lstrcpynW(out, S_WineLoaderW, size);
    else
    {
        if (len > 3 && !wcsicmp(&out[len - 3], S_DotSoW) &&
            (l = match_ext(out, len - 3)))
            lstrcpyW(&out[len - l - 3], S_ElfW);
    }
    while ((*out = towlower(*out))) out++;
}

void module_set_module(struct module* module, const WCHAR* name)
{
    module_fill_module(name, module->module.ModuleName, ARRAY_SIZE(module->module.ModuleName));
    module_fill_module(name, module->modulename, ARRAY_SIZE(module->modulename));
}

/* Returned string must be freed by caller */
WCHAR *get_wine_loader_name(struct process *pcs)
{
    const WCHAR *name;
    WCHAR* altname;
    unsigned len;

    name = process_getenv(pcs, L"WINELOADER");
    if (!name) name = pcs->is_64bit ? L"wine64" : L"wine";
    len = lstrlenW(name);

    /* WINELOADER isn't properly updated in Wow64 process calling inside Windows env block
     * (it's updated in ELF env block though)
     * So do the adaptation ourselves.
     */
    altname = HeapAlloc(GetProcessHeap(), 0, (len + 2 + 1) * sizeof(WCHAR));
    if (altname)
    {
        memcpy(altname, name, len * sizeof(WCHAR));
        if (pcs->is_64bit && len >= 2 && memcmp(name + len - 2, L"64", 2 * sizeof(WCHAR)) != 0)
            lstrcpyW(altname + len, L"64");
        else if (!pcs->is_64bit && len >= 2 && !memcmp(name + len - 2, L"64", 2 * sizeof(WCHAR)))
            altname[len - 2] = '\0';
        else
            altname[len] = '\0';
    }

    TRACE("returning %s\n", debugstr_w(altname));
    return altname;
}

static const char*      get_module_type(enum module_type type, BOOL virtual)
{
    switch (type)
    {
    case DMT_ELF: return virtual ? "Virtual ELF" : "ELF";
    case DMT_PE: return virtual ? "Virtual PE" : "PE";
    case DMT_MACHO: return virtual ? "Virtual Mach-O" : "Mach-O";
    default: return "---";
    }
}

/***********************************************************************
 * Creates and links a new module to a process
 */
struct module* module_new(struct process* pcs, const WCHAR* name,
                          enum module_type type, BOOL virtual,
                          DWORD64 mod_addr, DWORD64 size,
                          ULONG_PTR stamp, ULONG_PTR checksum, WORD machine)
{
    struct module*      module;
    unsigned            i;

    assert(type == DMT_ELF || type == DMT_PE || type == DMT_MACHO);
    if (!(module = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*module))))
	return NULL;

    module->next = pcs->lmodules;
    pcs->lmodules = module;

    TRACE("=> %s %s-%s %s\n",
          get_module_type(type, virtual),
	  wine_dbgstr_longlong(mod_addr), wine_dbgstr_longlong(mod_addr + size),
          debugstr_w(name));

    pool_init(&module->pool, 65536);

    module->process = pcs;
    module->module.SizeOfStruct = sizeof(module->module);
    module->module.BaseOfImage = mod_addr;
    module->module.ImageSize = size;
    module_set_module(module, name);
    module->module.ImageName[0] = '\0';
    lstrcpynW(module->module.LoadedImageName, name, ARRAY_SIZE(module->module.LoadedImageName));
    module->module.SymType = SymNone;
    module->module.NumSyms = 0;
    module->module.TimeDateStamp = stamp;
    module->module.CheckSum = checksum;

    memset(module->module.LoadedPdbName, 0, sizeof(module->module.LoadedPdbName));
    module->module.CVSig = 0;
    memset(module->module.CVData, 0, sizeof(module->module.CVData));
    module->module.PdbSig = 0;
    memset(&module->module.PdbSig70, 0, sizeof(module->module.PdbSig70));
    module->module.PdbAge = 0;
    module->module.PdbUnmatched = FALSE;
    module->module.DbgUnmatched = FALSE;
    module->module.LineNumbers = FALSE;
    module->module.GlobalSymbols = FALSE;
    module->module.TypeInfo = FALSE;
    module->module.SourceIndexed = FALSE;
    module->module.Publics = FALSE;
    module->module.MachineType = machine;
    module->module.Reserved = 0;

    module->reloc_delta       = 0;
    module->type              = type;
    module->is_virtual        = virtual;
    for (i = 0; i < DFI_LAST; i++) module->format_info[i] = NULL;
    module->sortlist_valid    = FALSE;
    module->sorttab_size      = 0;
    module->addr_sorttab      = NULL;
    module->num_sorttab       = 0;
    module->num_symbols       = 0;

    vector_init(&module->vsymt, sizeof(struct symt*), 128);
    /* FIXME: this seems a bit too high (on a per module basis)
     * need some statistics about this
     */
    hash_table_init(&module->pool, &module->ht_symbols, 4096);
    hash_table_init(&module->pool, &module->ht_types,   4096);
    vector_init(&module->vtypes, sizeof(struct symt*),  32);

    module->sources_used      = 0;
    module->sources_alloc     = 0;
    module->sources           = 0;
    wine_rb_init(&module->sources_offsets_tree, source_rb_compare);

    /* add top level symbol */
    module->top = symt_new_module(module);

    return module;
}

/***********************************************************************
 *	module_find_by_nameW
 *
 */
struct module* module_find_by_nameW(const struct process* pcs, const WCHAR* name)
{
    struct module*      module;

    for (module = pcs->lmodules; module; module = module->next)
    {
        if (!wcsicmp(name, module->modulename)) return module;
    }
    SetLastError(ERROR_INVALID_NAME);
    return NULL;
}

struct module* module_find_by_nameA(const struct process* pcs, const char* name)
{
    WCHAR wname[MAX_PATH];

    MultiByteToWideChar(CP_ACP, 0, name, -1, wname, ARRAY_SIZE(wname));
    return module_find_by_nameW(pcs, wname);
}

/***********************************************************************
 *	module_is_already_loaded
 *
 */
struct module* module_is_already_loaded(const struct process* pcs, const WCHAR* name)
{
    struct module*      module;
    const WCHAR*        filename;

    /* first compare the loaded image name... */
    for (module = pcs->lmodules; module; module = module->next)
    {
        if (!wcsicmp(name, module->module.LoadedImageName))
            return module;
    }
    /* then compare the standard filenames (without the path) ... */
    filename = get_filename(name, NULL);
    for (module = pcs->lmodules; module; module = module->next)
    {
        if (!wcsicmp(filename, get_filename(module->module.LoadedImageName, NULL)))
            return module;
    }
    SetLastError(ERROR_INVALID_NAME);
    return NULL;
}

/***********************************************************************
 *           module_get_container
 *
 */
static struct module* module_get_container(const struct process* pcs,
                                    const struct module* inner)
{
    struct module*      module;
     
    for (module = pcs->lmodules; module; module = module->next)
    {
        if (module != inner &&
            module->module.BaseOfImage <= inner->module.BaseOfImage &&
            module->module.BaseOfImage + module->module.ImageSize >=
            inner->module.BaseOfImage + inner->module.ImageSize)
            return module;
    }
    return NULL;
}

/***********************************************************************
 *           module_get_containee
 *
 */
struct module* module_get_containee(const struct process* pcs, const struct module* outer)
{
    struct module*      module;

    for (module = pcs->lmodules; module; module = module->next)
    {
        if (module != outer &&
            outer->module.BaseOfImage <= module->module.BaseOfImage &&
            outer->module.BaseOfImage + outer->module.ImageSize >=
            module->module.BaseOfImage + module->module.ImageSize)
            return module;
    }
    return NULL;
}

/******************************************************************
 *		module_get_debug
 *
 * get the debug information from a module:
 * - if the module's type is deferred, then force loading of debug info (and return
 *   the module itself)
 * - if the module has no debug info and has an ELF container, then return the ELF
 *   container (and also force the ELF container's debug info loading if deferred)
 * - otherwise return the module itself if it has some debug info
 */
BOOL module_get_debug(struct module_pair* pair)
{
    IMAGEHLP_DEFERRED_SYMBOL_LOADW64    idslW64;

    if (!pair->requested) return FALSE;
    /* for a PE builtin, always get info from container */
    if (!(pair->effective = module_get_container(pair->pcs, pair->requested)))
        pair->effective = pair->requested;
    /* if deferred, force loading */
    if (pair->effective->module.SymType == SymDeferred)
    {
        BOOL ret;
        
        if (pair->effective->is_virtual) ret = FALSE;
        else if (pair->effective->type == DMT_PE)
        {
            idslW64.SizeOfStruct = sizeof(idslW64);
            idslW64.BaseOfImage = pair->effective->module.BaseOfImage;
            idslW64.CheckSum = pair->effective->module.CheckSum;
            idslW64.TimeDateStamp = pair->effective->module.TimeDateStamp;
            memcpy(idslW64.FileName, pair->effective->module.ImageName,
                   sizeof(pair->effective->module.ImageName));
            idslW64.Reparse = FALSE;
            idslW64.hFile = INVALID_HANDLE_VALUE;

            pcs_callback(pair->pcs, CBA_DEFERRED_SYMBOL_LOAD_START, &idslW64);
            ret = pe_load_debug_info(pair->pcs, pair->effective);
            pcs_callback(pair->pcs,
                         ret ? CBA_DEFERRED_SYMBOL_LOAD_COMPLETE : CBA_DEFERRED_SYMBOL_LOAD_FAILURE,
                         &idslW64);
        }
        else ret = pair->pcs->loader->load_debug_info(pair->pcs, pair->effective);

        if (!ret) pair->effective->module.SymType = SymNone;
        assert(pair->effective->module.SymType != SymDeferred);
        pair->effective->module.NumSyms = pair->effective->ht_symbols.num_elts;
    }
    return pair->effective->module.SymType != SymNone;
}

/***********************************************************************
 *	module_find_by_addr
 *
 * either the addr where module is loaded, or any address inside the 
 * module
 */
struct module* module_find_by_addr(const struct process* pcs, DWORD64 addr,
                                   enum module_type type)
{
    struct module*      module;
    
    if (type == DMT_UNKNOWN)
    {
        if ((module = module_find_by_addr(pcs, addr, DMT_PE)) ||
            (module = module_find_by_addr(pcs, addr, DMT_ELF)) ||
            (module = module_find_by_addr(pcs, addr, DMT_MACHO)))
            return module;
    }
    else
    {
        for (module = pcs->lmodules; module; module = module->next)
        {
            if (type == module->type && addr >= module->module.BaseOfImage &&
                addr < module->module.BaseOfImage + module->module.ImageSize) 
                return module;
        }
    }
    SetLastError(ERROR_MOD_NOT_FOUND);
    return module;
}

/******************************************************************
 *		module_is_container_loaded
 *
 * checks whether the native container, for a (supposed) PE builtin is
 * already loaded
 */
static BOOL module_is_container_loaded(const struct process* pcs,
                                       const WCHAR* ImageName, DWORD64 base)
{
    size_t              len;
    struct module*      module;
    PCWSTR              filename, modname;

    if (!base) return FALSE;
    filename = get_filename(ImageName, NULL);
    len = lstrlenW(filename);

    for (module = pcs->lmodules; module; module = module->next)
    {
        if ((module->type == DMT_ELF || module->type == DMT_MACHO) &&
            base >= module->module.BaseOfImage &&
            base < module->module.BaseOfImage + module->module.ImageSize)
        {
            modname = get_filename(module->module.LoadedImageName, NULL);
            if (!wcsnicmp(modname, filename, len) &&
                !memcmp(modname + len, S_DotSoW, 3 * sizeof(WCHAR)))
            {
                return TRUE;
            }
        }
    }
    /* likely a native PE module */
    WARN("Couldn't find container for %s\n", debugstr_w(ImageName));
    return FALSE;
}

static BOOL image_check_debug_link(const WCHAR* file, struct image_file_map* fmap, DWORD link_crc)
{
    DWORD read_bytes;
    HANDLE handle;
    WCHAR *path;
    WORD magic;
    BOOL ret;

    path = get_dos_file_name(file);
    handle = CreateFileW(path, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);
    heap_free(path);
    if (handle == INVALID_HANDLE_VALUE) return FALSE;

    if (link_crc)
    {
        DWORD crc = calc_crc32(handle);
        if (crc != link_crc)
        {
            WARN("Bad CRC for file %s (got %08x while expecting %08x)\n",  debugstr_w(file), crc, link_crc);
            CloseHandle(handle);
            return FALSE;
        }
    }

    SetFilePointer(handle, 0, 0, FILE_BEGIN);
    if (ReadFile(handle, &magic, sizeof(magic), &read_bytes, NULL) && magic == IMAGE_DOS_SIGNATURE)
        ret = pe_map_file(handle, fmap, DMT_PE);
    else
        ret = elf_map_handle(handle, fmap);
    CloseHandle(handle);
    return ret;
}

/******************************************************************
 *		image_locate_debug_link
 *
 * Locate a filename from a .gnu_debuglink section, using the same
 * strategy as gdb:
 * "If the full name of the directory containing the executable is
 * execdir, and the executable has a debug link that specifies the
 * name debugfile, then GDB will automatically search for the
 * debugging information file in three places:
 *  - the directory containing the executable file (that is, it
 *    will look for a file named `execdir/debugfile',
 *  - a subdirectory of that directory named `.debug' (that is, the
 *    file `execdir/.debug/debugfile', and
 *  - a subdirectory of the global debug file directory that includes
 *    the executable's full path, and the name from the link (that is,
 *    the file `globaldebugdir/execdir/debugfile', where globaldebugdir
 *    is the global debug file directory, and execdir has been turned
 *    into a relative path)." (from GDB manual)
 */
static BOOL image_locate_debug_link(const struct module* module, struct image_file_map* fmap, const char* filename, DWORD crc)
{
    static const WCHAR globalDebugDirW[] = {'/','u','s','r','/','l','i','b','/','d','e','b','u','g','/'};
    static const WCHAR dotDebugW[] = {'.','d','e','b','u','g','/'};
    const size_t globalDebugDirLen = ARRAY_SIZE(globalDebugDirW);
    size_t filename_len, path_len;
    WCHAR* p = NULL;
    WCHAR* slash;
    WCHAR* slash2;
    struct image_file_map* fmap_link = NULL;

    fmap_link = HeapAlloc(GetProcessHeap(), 0, sizeof(*fmap_link));
    if (!fmap_link) return FALSE;

    filename_len = MultiByteToWideChar(CP_UNIXCP, 0, filename, -1, NULL, 0);
    path_len = lstrlenW(module->module.LoadedImageName);
    if (module->real_path) path_len = max(path_len, lstrlenW(module->real_path));
    p = HeapAlloc(GetProcessHeap(), 0,
                  (globalDebugDirLen + path_len + 6 + 1 + filename_len + 1) * sizeof(WCHAR));
    if (!p) goto found;

    /* we prebuild the string with "execdir" */
    lstrcpyW(p, module->module.LoadedImageName);
    slash = p;
    if ((slash2 = wcsrchr(slash, '/'))) slash = slash2 + 1;
    if ((slash2 = wcsrchr(slash, '\\'))) slash = slash2 + 1;

    /* testing execdir/filename */
    MultiByteToWideChar(CP_UNIXCP, 0, filename, -1, slash, filename_len);
    if (image_check_debug_link(p, fmap_link, crc)) goto found;

    /* testing execdir/.debug/filename */
    memcpy(slash, dotDebugW, sizeof(dotDebugW));
    MultiByteToWideChar(CP_UNIXCP, 0, filename, -1, slash + ARRAY_SIZE(dotDebugW), filename_len);
    if (image_check_debug_link(p, fmap_link, crc)) goto found;

    if (module->real_path)
    {
        lstrcpyW(p, module->real_path);
        slash = p;
        if ((slash2 = wcsrchr(slash, '/'))) slash = slash2 + 1;
        if ((slash2 = wcsrchr(slash, '\\'))) slash = slash2 + 1;
        MultiByteToWideChar(CP_UNIXCP, 0, filename, -1, slash, filename_len);
        if (image_check_debug_link(p, fmap_link, crc)) goto found;
    }

    /* testing globaldebugdir/execdir/filename */
    memmove(p + globalDebugDirLen, p, (slash - p) * sizeof(WCHAR));
    memcpy(p, globalDebugDirW, globalDebugDirLen * sizeof(WCHAR));
    slash += globalDebugDirLen;
    MultiByteToWideChar(CP_UNIXCP, 0, filename, -1, slash, filename_len);
    if (image_check_debug_link(p, fmap_link, crc)) goto found;

    /* finally testing filename */
    if (image_check_debug_link(slash, fmap_link, crc)) goto found;


    WARN("Couldn't locate or map %s\n", filename);
    HeapFree(GetProcessHeap(), 0, p);
    HeapFree(GetProcessHeap(), 0, fmap_link);
    return FALSE;

found:
    TRACE("Located debug information file %s at %s\n", filename, debugstr_w(p));
    HeapFree(GetProcessHeap(), 0, p);
    fmap->alternate = fmap_link;
    return TRUE;
}

/******************************************************************
 *		image_locate_build_id_target
 *
 * Try to find the .so file containing the debug info out of the build-id note information
 */
static BOOL image_locate_build_id_target(struct image_file_map* fmap, const BYTE* id, unsigned idlen)
{
    static const WCHAR globalDebugDirW[] = {'/','u','s','r','/','l','i','b','/','d','e','b','u','g','/'};
    static const WCHAR buildidW[] = {'.','b','u','i','l','d','-','i','d','/'};
    static const WCHAR dotDebug0W[] = {'.','d','e','b','u','g',0};
    struct image_file_map* fmap_link = NULL;
    WCHAR* p;
    WCHAR* z;
    const BYTE* idend = id + idlen;

    fmap_link = HeapAlloc(GetProcessHeap(), 0, sizeof(*fmap_link));
    if (!fmap_link) return FALSE;

    p = HeapAlloc(GetProcessHeap(), 0,
                  sizeof(globalDebugDirW) + sizeof(buildidW) +
                  (idlen * 2 + 1) * sizeof(WCHAR) + sizeof(dotDebug0W));
    z = p;
    memcpy(z, globalDebugDirW, sizeof(globalDebugDirW));
    z += ARRAY_SIZE(globalDebugDirW);
    memcpy(z, buildidW, sizeof(buildidW));
    z += ARRAY_SIZE(buildidW);

    if (id < idend)
    {
        *z++ = "0123456789abcdef"[*id >> 4  ];
        *z++ = "0123456789abcdef"[*id & 0x0F];
        id++;
    }
    if (id < idend)
        *z++ = '/';
    while (id < idend)
    {
        *z++ = "0123456789abcdef"[*id >> 4  ];
        *z++ = "0123456789abcdef"[*id & 0x0F];
        id++;
    }
    memcpy(z, dotDebug0W, sizeof(dotDebug0W));
    TRACE("checking %s\n", wine_dbgstr_w(p));

    if (image_check_debug_link(p, fmap_link, 0))
    {
        struct image_section_map buildid_sect;
        if (image_find_section(fmap_link, ".note.gnu.build-id", &buildid_sect))
        {
            const UINT32* note;

            note = (const UINT32*)image_map_section(&buildid_sect);
            if (note != IMAGE_NO_MAP)
            {
                /* the usual ELF note structure: name-size desc-size type <name> <desc> */
                if (note[2] == NOTE_GNU_BUILD_ID)
                {
                    if (note[1] == idlen &&
                        !memcmp(note + 3 + ((note[0] + 3) >> 2), idend - idlen, idlen))
                    {
                        TRACE("Located debug information file at %s\n", debugstr_w(p));
                        HeapFree(GetProcessHeap(), 0, p);
                        fmap->alternate = fmap_link;
                        return TRUE;
                    }
                    WARN("mismatch in buildid information for %s\n", wine_dbgstr_w(p));
                }
            }
            image_unmap_section(&buildid_sect);
        }
        image_unmap_file(fmap_link);
    }

    TRACE("not found\n");
    HeapFree(GetProcessHeap(), 0, p);
    HeapFree(GetProcessHeap(), 0, fmap_link);
    return FALSE;
}

/******************************************************************
 *		image_check_alternate
 *
 * Load alternate files for a given image file, looking at either .note.gnu_build-id
 * or .gnu_debuglink sections.
 */
BOOL image_check_alternate(struct image_file_map* fmap, const struct module* module)
{
    BOOL ret = FALSE;
    BOOL found = FALSE;
    struct image_section_map buildid_sect, debuglink_sect;

    /* if present, add the .gnu_debuglink file as an alternate to current one */
    if (image_find_section(fmap, ".note.gnu.build-id", &buildid_sect))
    {
        const UINT32* note;

        found = TRUE;
        note = (const UINT32*)image_map_section(&buildid_sect);
        if (note != IMAGE_NO_MAP)
        {
            /* the usual ELF note structure: name-size desc-size type <name> <desc> */
            if (note[2] == NOTE_GNU_BUILD_ID)
            {
                ret = image_locate_build_id_target(fmap, (const BYTE*)(note + 3 + ((note[0] + 3) >> 2)), note[1]);
            }
        }
        image_unmap_section(&buildid_sect);
    }
    /* if present, add the .gnu_debuglink file as an alternate to current one */
    if (!ret && image_find_section(fmap, ".gnu_debuglink", &debuglink_sect))
    {
        const char* dbg_link;

        found = TRUE;
        dbg_link = image_map_section(&debuglink_sect);
        if (dbg_link != IMAGE_NO_MAP)
        {
            /* The content of a debug link section is:
             * 1/ a NULL terminated string, containing the file name for the
             *    debug info
             * 2/ padding on 4 byte boundary
             * 3/ CRC of the linked file
             */
            DWORD crc = *(const DWORD*)(dbg_link + ((DWORD_PTR)(strlen(dbg_link) + 4) & ~3));
            ret = image_locate_debug_link(module, fmap, dbg_link, crc);
            if (!ret)
                WARN("Couldn't load linked debug file for %s\n",
                     debugstr_w(module->modulename));
        }
        image_unmap_section(&debuglink_sect);
    }
    return found ? ret : TRUE;
}

/***********************************************************************
 *			SymLoadModule (DBGHELP.@)
 */
DWORD WINAPI SymLoadModule(HANDLE hProcess, HANDLE hFile, PCSTR ImageName,
                           PCSTR ModuleName, DWORD BaseOfDll, DWORD SizeOfDll)
{
    return SymLoadModuleEx(hProcess, hFile, ImageName, ModuleName, BaseOfDll,
                           SizeOfDll, NULL, 0);
}

/***********************************************************************
 *			SymLoadModuleEx (DBGHELP.@)
 */
DWORD64 WINAPI  SymLoadModuleEx(HANDLE hProcess, HANDLE hFile, PCSTR ImageName,
                                PCSTR ModuleName, DWORD64 BaseOfDll, DWORD DllSize,
                                PMODLOAD_DATA Data, DWORD Flags)
{
    PWSTR       wImageName, wModuleName;
    unsigned    len;
    DWORD64     ret;

    TRACE("(%p %p %s %s %s %08x %p %08x)\n",
          hProcess, hFile, debugstr_a(ImageName), debugstr_a(ModuleName),
          wine_dbgstr_longlong(BaseOfDll), DllSize, Data, Flags);

    if (ImageName)
    {
        len = MultiByteToWideChar(CP_ACP, 0, ImageName, -1, NULL, 0);
        wImageName = HeapAlloc(GetProcessHeap(), 0, len * sizeof(WCHAR));
        MultiByteToWideChar(CP_ACP, 0, ImageName, -1, wImageName, len);
    }
    else wImageName = NULL;
    if (ModuleName)
    {
        len = MultiByteToWideChar(CP_ACP, 0, ModuleName, -1, NULL, 0);
        wModuleName = HeapAlloc(GetProcessHeap(), 0, len * sizeof(WCHAR));
        MultiByteToWideChar(CP_ACP, 0, ModuleName, -1, wModuleName, len);
    }
    else wModuleName = NULL;

    ret = SymLoadModuleExW(hProcess, hFile, wImageName, wModuleName,
                          BaseOfDll, DllSize, Data, Flags);
    HeapFree(GetProcessHeap(), 0, wImageName);
    HeapFree(GetProcessHeap(), 0, wModuleName);
    return ret;
}

/***********************************************************************
 *			SymLoadModuleExW (DBGHELP.@)
 */
DWORD64 WINAPI  SymLoadModuleExW(HANDLE hProcess, HANDLE hFile, PCWSTR wImageName,
                                 PCWSTR wModuleName, DWORD64 BaseOfDll, DWORD SizeOfDll,
                                 PMODLOAD_DATA Data, DWORD Flags)
{
    struct process*     pcs;
    struct module*	module = NULL;

    TRACE("(%p %p %s %s %s %08x %p %08x)\n",
          hProcess, hFile, debugstr_w(wImageName), debugstr_w(wModuleName),
          wine_dbgstr_longlong(BaseOfDll), SizeOfDll, Data, Flags);

    if (Data)
        FIXME("Unsupported load data parameter %p for %s\n",
              Data, debugstr_w(wImageName));

    if (!(pcs = process_find_by_handle(hProcess))) return 0;

    if (Flags & SLMFLAG_VIRTUAL)
    {
        if (!wImageName) return 0;
        module = module_new(pcs, wImageName, DMT_PE, TRUE, BaseOfDll, SizeOfDll, 0, 0, IMAGE_FILE_MACHINE_UNKNOWN);
        if (!module) return 0;
        if (wModuleName) module_set_module(module, wModuleName);
        module->module.SymType = SymVirtual;

        return module->module.BaseOfImage;
    }
    if (Flags & ~(SLMFLAG_VIRTUAL))
        FIXME("Unsupported Flags %08x for %s\n", Flags, debugstr_w(wImageName));

    if (!validate_addr64(BaseOfDll)) return 0;

    pcs->loader->synchronize_module_list(pcs);

    /* this is a Wine extension to the API just to redo the synchronisation */
    if (!wImageName && !hFile) return 0;

    /* check if the module is already loaded, or if it's a builtin PE module with
     * an containing ELF module
     */
    if (wImageName)
    {
        module = module_is_already_loaded(pcs, wImageName);
        if (module)
        {
            if (module->module.BaseOfImage == BaseOfDll)
                SetLastError(ERROR_SUCCESS);
            else
            {
                /* native allows to load the same module at different addresses
                 * we don't support this for now
                 */
                SetLastError(ERROR_INVALID_PARAMETER);
                FIXME("Reloading %s at different base address isn't supported\n", debugstr_w(module->modulename));
            }
            return 0;
        }
        if (!module && module_is_container_loaded(pcs, wImageName, BaseOfDll))
        {
            /* force the loading of DLL as builtin */
            module = pe_load_builtin_module(pcs, wImageName, BaseOfDll, SizeOfDll);
        }
    }
    if (!module)
    {
        /* otherwise, try a regular PE module */
        if (!(module = pe_load_native_module(pcs, wImageName, hFile, BaseOfDll, SizeOfDll)) &&
            wImageName)
        {
            /* and finally an ELF or Mach-O module */
            module = pcs->loader->load_module(pcs, wImageName, BaseOfDll);
        }
    }
    if (!module)
    {
        WARN("Couldn't locate %s\n", debugstr_w(wImageName));
        return 0;
    }
    module->module.NumSyms = module->ht_symbols.num_elts;
    /* by default module_new fills module.ModuleName from a derivation
     * of LoadedImageName. Overwrite it, if we have better information
     */
    if (wModuleName)
        module_set_module(module, wModuleName);
    if (wImageName)
        lstrcpynW(module->module.ImageName, wImageName, ARRAY_SIZE(module->module.ImageName));

    return module->module.BaseOfImage;
}

/***********************************************************************
 *                     SymLoadModule64 (DBGHELP.@)
 */
DWORD64 WINAPI SymLoadModule64(HANDLE hProcess, HANDLE hFile, PCSTR ImageName,
                               PCSTR ModuleName, DWORD64 BaseOfDll, DWORD SizeOfDll)
{
    return SymLoadModuleEx(hProcess, hFile, ImageName, ModuleName, BaseOfDll, SizeOfDll,
                           NULL, 0);
}

/******************************************************************
 *		module_remove
 *
 */
BOOL module_remove(struct process* pcs, struct module* module)
{
    struct module_format*modfmt;
    struct module**     p;
    unsigned            i;

    TRACE("%s (%p)\n", debugstr_w(module->modulename), module);

    for (i = 0; i < DFI_LAST; i++)
    {
        if ((modfmt = module->format_info[i]) && modfmt->remove)
            modfmt->remove(pcs, module->format_info[i]);
    }
    hash_table_destroy(&module->ht_symbols);
    hash_table_destroy(&module->ht_types);
    HeapFree(GetProcessHeap(), 0, module->sources);
    HeapFree(GetProcessHeap(), 0, module->addr_sorttab);
    HeapFree(GetProcessHeap(), 0, module->real_path);
    pool_destroy(&module->pool);
    /* native dbghelp doesn't invoke registered callback(,CBA_SYMBOLS_UNLOADED,) here
     * so do we
     */
    for (p = &pcs->lmodules; *p; p = &(*p)->next)
    {
        if (*p == module)
        {
            *p = module->next;
            HeapFree(GetProcessHeap(), 0, module);
            return TRUE;
        }
    }
    FIXME("This shouldn't happen\n");
    return FALSE;
}

/******************************************************************
 *		SymUnloadModule (DBGHELP.@)
 *
 */
BOOL WINAPI SymUnloadModule(HANDLE hProcess, DWORD BaseOfDll)
{
    struct process*     pcs;
    struct module*      module;

    pcs = process_find_by_handle(hProcess);
    if (!pcs) return FALSE;
    module = module_find_by_addr(pcs, BaseOfDll, DMT_UNKNOWN);
    if (!module) return FALSE;
    return module_remove(pcs, module);
}

/******************************************************************
 *		SymUnloadModule64 (DBGHELP.@)
 *
 */
BOOL WINAPI SymUnloadModule64(HANDLE hProcess, DWORD64 BaseOfDll)
{
    struct process*     pcs;
    struct module*      module;

    pcs = process_find_by_handle(hProcess);
    if (!pcs) return FALSE;
    module = module_find_by_addr(pcs, BaseOfDll, DMT_UNKNOWN);
    if (!module) return FALSE;
    return module_remove(pcs, module);
}

/******************************************************************
 *		SymEnumerateModules (DBGHELP.@)
 *
 */
struct enum_modW64_32
{
    PSYM_ENUMMODULES_CALLBACK   cb;
    PVOID                       user;
    char                        module[MAX_PATH];
};

static BOOL CALLBACK enum_modW64_32(PCWSTR name, DWORD64 base, PVOID user)
{
    struct enum_modW64_32*      x = user;

    WideCharToMultiByte(CP_ACP, 0, name, -1, x->module, sizeof(x->module), NULL, NULL);
    return x->cb(x->module, (DWORD)base, x->user);
}

BOOL  WINAPI SymEnumerateModules(HANDLE hProcess,
                                 PSYM_ENUMMODULES_CALLBACK EnumModulesCallback,  
                                 PVOID UserContext)
{
    struct enum_modW64_32       x;

    x.cb = EnumModulesCallback;
    x.user = UserContext;

    return SymEnumerateModulesW64(hProcess, enum_modW64_32, &x);
}

/******************************************************************
 *		SymEnumerateModules64 (DBGHELP.@)
 *
 */
struct enum_modW64_64
{
    PSYM_ENUMMODULES_CALLBACK64 cb;
    PVOID                       user;
    char                        module[MAX_PATH];
};

static BOOL CALLBACK enum_modW64_64(PCWSTR name, DWORD64 base, PVOID user)
{
    struct enum_modW64_64*      x = user;

    WideCharToMultiByte(CP_ACP, 0, name, -1, x->module, sizeof(x->module), NULL, NULL);
    return x->cb(x->module, base, x->user);
}

BOOL  WINAPI SymEnumerateModules64(HANDLE hProcess,
                                   PSYM_ENUMMODULES_CALLBACK64 EnumModulesCallback,  
                                   PVOID UserContext)
{
    struct enum_modW64_64       x;

    x.cb = EnumModulesCallback;
    x.user = UserContext;

    return SymEnumerateModulesW64(hProcess, enum_modW64_64, &x);
}

/******************************************************************
 *		SymEnumerateModulesW64 (DBGHELP.@)
 *
 */
BOOL  WINAPI SymEnumerateModulesW64(HANDLE hProcess,
                                    PSYM_ENUMMODULES_CALLBACKW64 EnumModulesCallback,
                                    PVOID UserContext)
{
    struct process*     pcs = process_find_by_handle(hProcess);
    struct module*      module;

    if (!pcs) return FALSE;
    
    for (module = pcs->lmodules; module; module = module->next)
    {
        if (!dbghelp_opt_native &&
            (module->type == DMT_ELF || module->type == DMT_MACHO))
            continue;
        if (!EnumModulesCallback(module->modulename,
                                 module->module.BaseOfImage, UserContext))
            break;
    }
    return TRUE;
}

/******************************************************************
 *		EnumerateLoadedModules64 (DBGHELP.@)
 *
 */
struct enum_load_modW64_64
{
    PENUMLOADED_MODULES_CALLBACK64      cb;
    PVOID                               user;
    char                                module[MAX_PATH];
};

static BOOL CALLBACK enum_load_modW64_64(PCWSTR name, DWORD64 base, ULONG size,
                                         PVOID user)
{
    struct enum_load_modW64_64* x = user;

    WideCharToMultiByte(CP_ACP, 0, name, -1, x->module, sizeof(x->module), NULL, NULL);
    return x->cb(x->module, base, size, x->user);
}

BOOL  WINAPI EnumerateLoadedModules64(HANDLE hProcess,
                                      PENUMLOADED_MODULES_CALLBACK64 EnumLoadedModulesCallback,
                                      PVOID UserContext)
{
    struct enum_load_modW64_64  x;

    x.cb = EnumLoadedModulesCallback;
    x.user = UserContext;

    return EnumerateLoadedModulesW64(hProcess, enum_load_modW64_64, &x);
}

/******************************************************************
 *		EnumerateLoadedModules (DBGHELP.@)
 *
 */
struct enum_load_modW64_32
{
    PENUMLOADED_MODULES_CALLBACK        cb;
    PVOID                               user;
    char                                module[MAX_PATH];
};

static BOOL CALLBACK enum_load_modW64_32(PCWSTR name, DWORD64 base, ULONG size,
                                         PVOID user)
{
    struct enum_load_modW64_32* x = user;
    WideCharToMultiByte(CP_ACP, 0, name, -1, x->module, sizeof(x->module), NULL, NULL);
    return x->cb(x->module, (DWORD)base, size, x->user);
}

BOOL  WINAPI EnumerateLoadedModules(HANDLE hProcess,
                                    PENUMLOADED_MODULES_CALLBACK EnumLoadedModulesCallback,
                                    PVOID UserContext)
{
    struct enum_load_modW64_32  x;

    x.cb = EnumLoadedModulesCallback;
    x.user = UserContext;

    return EnumerateLoadedModulesW64(hProcess, enum_load_modW64_32, &x);
}

/******************************************************************
 *		EnumerateLoadedModulesW64 (DBGHELP.@)
 *
 */
BOOL  WINAPI EnumerateLoadedModulesW64(HANDLE hProcess,
                                       PENUMLOADED_MODULES_CALLBACKW64 EnumLoadedModulesCallback,
                                       PVOID UserContext)
{
    HMODULE*    hMods;
    WCHAR       baseW[256], modW[256];
    DWORD       i, sz;
    MODULEINFO  mi;

    hMods = HeapAlloc(GetProcessHeap(), 0, 256 * sizeof(hMods[0]));
    if (!hMods) return FALSE;

    if (!EnumProcessModules(hProcess, hMods, 256 * sizeof(hMods[0]), &sz))
    {
        /* hProcess should also be a valid process handle !! */
        FIXME("If this happens, bump the number in mod\n");
        HeapFree(GetProcessHeap(), 0, hMods);
        return FALSE;
    }
    sz /= sizeof(HMODULE);
    for (i = 0; i < sz; i++)
    {
        if (!GetModuleInformation(hProcess, hMods[i], &mi, sizeof(mi)) ||
            !GetModuleBaseNameW(hProcess, hMods[i], baseW, ARRAY_SIZE(baseW)))
            continue;
        module_fill_module(baseW, modW, ARRAY_SIZE(modW));
        EnumLoadedModulesCallback(modW, (DWORD_PTR)mi.lpBaseOfDll, mi.SizeOfImage,
                                  UserContext);
    }
    HeapFree(GetProcessHeap(), 0, hMods);

    return sz != 0 && i == sz;
}

static void dbghelp_str_WtoA(const WCHAR *src, char *dst, int dst_len)
{
    WideCharToMultiByte(CP_ACP, 0, src, -1, dst, dst_len - 1, NULL, NULL);
    dst[dst_len - 1] = 0;
}

/******************************************************************
 *		SymGetModuleInfo (DBGHELP.@)
 *
 */
BOOL  WINAPI SymGetModuleInfo(HANDLE hProcess, DWORD dwAddr,
                              PIMAGEHLP_MODULE ModuleInfo)
{
    IMAGEHLP_MODULE     mi;
    IMAGEHLP_MODULEW64  miw64;

    if (sizeof(mi) < ModuleInfo->SizeOfStruct) FIXME("Wrong size\n");

    miw64.SizeOfStruct = sizeof(miw64);
    if (!SymGetModuleInfoW64(hProcess, dwAddr, &miw64)) return FALSE;

    mi.SizeOfStruct  = ModuleInfo->SizeOfStruct;
    mi.BaseOfImage   = miw64.BaseOfImage;
    mi.ImageSize     = miw64.ImageSize;
    mi.TimeDateStamp = miw64.TimeDateStamp;
    mi.CheckSum      = miw64.CheckSum;
    mi.NumSyms       = miw64.NumSyms;
    mi.SymType       = miw64.SymType;
    dbghelp_str_WtoA(miw64.ModuleName, mi.ModuleName, sizeof(mi.ModuleName));
    dbghelp_str_WtoA(miw64.ImageName, mi.ImageName, sizeof(mi.ImageName));
    dbghelp_str_WtoA(miw64.LoadedImageName, mi.LoadedImageName, sizeof(mi.LoadedImageName));

    memcpy(ModuleInfo, &mi, ModuleInfo->SizeOfStruct);

    return TRUE;
}

/******************************************************************
 *		SymGetModuleInfoW (DBGHELP.@)
 *
 */
BOOL  WINAPI SymGetModuleInfoW(HANDLE hProcess, DWORD dwAddr,
                               PIMAGEHLP_MODULEW ModuleInfo)
{
    IMAGEHLP_MODULEW64  miw64;
    IMAGEHLP_MODULEW    miw;

    if (sizeof(miw) < ModuleInfo->SizeOfStruct) FIXME("Wrong size\n");

    miw64.SizeOfStruct = sizeof(miw64);
    if (!SymGetModuleInfoW64(hProcess, dwAddr, &miw64)) return FALSE;

    miw.SizeOfStruct  = ModuleInfo->SizeOfStruct;
    miw.BaseOfImage   = miw64.BaseOfImage;
    miw.ImageSize     = miw64.ImageSize;
    miw.TimeDateStamp = miw64.TimeDateStamp;
    miw.CheckSum      = miw64.CheckSum;
    miw.NumSyms       = miw64.NumSyms;
    miw.SymType       = miw64.SymType;
    lstrcpyW(miw.ModuleName, miw64.ModuleName);
    lstrcpyW(miw.ImageName, miw64.ImageName);
    lstrcpyW(miw.LoadedImageName, miw64.LoadedImageName);
    memcpy(ModuleInfo, &miw, ModuleInfo->SizeOfStruct);

    return TRUE;
}

/******************************************************************
 *		SymGetModuleInfo64 (DBGHELP.@)
 *
 */
BOOL  WINAPI SymGetModuleInfo64(HANDLE hProcess, DWORD64 dwAddr,
                                PIMAGEHLP_MODULE64 ModuleInfo)
{
    IMAGEHLP_MODULE64   mi64;
    IMAGEHLP_MODULEW64  miw64;

    if (sizeof(mi64) < ModuleInfo->SizeOfStruct)
    {
        SetLastError(ERROR_MOD_NOT_FOUND); /* NOTE: native returns this error */
        WARN("Wrong size %u\n", ModuleInfo->SizeOfStruct);
        return FALSE;
    }

    miw64.SizeOfStruct = sizeof(miw64);
    if (!SymGetModuleInfoW64(hProcess, dwAddr, &miw64)) return FALSE;

    mi64.SizeOfStruct  = ModuleInfo->SizeOfStruct;
    mi64.BaseOfImage   = miw64.BaseOfImage;
    mi64.ImageSize     = miw64.ImageSize;
    mi64.TimeDateStamp = miw64.TimeDateStamp;
    mi64.CheckSum      = miw64.CheckSum;
    mi64.NumSyms       = miw64.NumSyms;
    mi64.SymType       = miw64.SymType;
    dbghelp_str_WtoA(miw64.ModuleName, mi64.ModuleName, sizeof(mi64.ModuleName));
    dbghelp_str_WtoA(miw64.ImageName, mi64.ImageName, sizeof(mi64.ImageName));
    dbghelp_str_WtoA(miw64.LoadedImageName, mi64.LoadedImageName, sizeof(mi64.LoadedImageName));
    dbghelp_str_WtoA(miw64.LoadedPdbName, mi64.LoadedPdbName, sizeof(mi64.LoadedPdbName));

    mi64.CVSig         = miw64.CVSig;
    dbghelp_str_WtoA(miw64.CVData, mi64.CVData, sizeof(mi64.CVData));
    mi64.PdbSig        = miw64.PdbSig;
    mi64.PdbSig70      = miw64.PdbSig70;
    mi64.PdbAge        = miw64.PdbAge;
    mi64.PdbUnmatched  = miw64.PdbUnmatched;
    mi64.DbgUnmatched  = miw64.DbgUnmatched;
    mi64.LineNumbers   = miw64.LineNumbers;
    mi64.GlobalSymbols = miw64.GlobalSymbols;
    mi64.TypeInfo      = miw64.TypeInfo;
    mi64.SourceIndexed = miw64.SourceIndexed;
    mi64.Publics       = miw64.Publics;
    mi64.MachineType   = miw64.MachineType;
    mi64.Reserved      = miw64.Reserved;

    memcpy(ModuleInfo, &mi64, ModuleInfo->SizeOfStruct);

    return TRUE;
}

/******************************************************************
 *		SymGetModuleInfoW64 (DBGHELP.@)
 *
 */
BOOL  WINAPI SymGetModuleInfoW64(HANDLE hProcess, DWORD64 dwAddr,
                                 PIMAGEHLP_MODULEW64 ModuleInfo)
{
    struct process*     pcs = process_find_by_handle(hProcess);
    struct module*      module;
    IMAGEHLP_MODULEW64  miw64;

    TRACE("%p %s %p\n", hProcess, wine_dbgstr_longlong(dwAddr), ModuleInfo);

    if (!pcs) return FALSE;
    if (ModuleInfo->SizeOfStruct > sizeof(*ModuleInfo)) return FALSE;
    module = module_find_by_addr(pcs, dwAddr, DMT_UNKNOWN);
    if (!module) return FALSE;

    miw64 = module->module;

    /* update debug information from container if any */
    if (module->module.SymType == SymNone)
    {
        module = module_get_container(pcs, module);
        if (module && module->module.SymType != SymNone)
        {
            miw64.SymType = module->module.SymType;
            miw64.NumSyms = module->module.NumSyms;
        }
    }
    memcpy(ModuleInfo, &miw64, ModuleInfo->SizeOfStruct);
    return TRUE;
}

/***********************************************************************
 *		SymGetModuleBase (DBGHELP.@)
 */
DWORD WINAPI SymGetModuleBase(HANDLE hProcess, DWORD dwAddr)
{
    DWORD64     ret;

    ret = SymGetModuleBase64(hProcess, dwAddr);
    return validate_addr64(ret) ? ret : 0;
}

/***********************************************************************
 *		SymGetModuleBase64 (DBGHELP.@)
 */
DWORD64 WINAPI SymGetModuleBase64(HANDLE hProcess, DWORD64 dwAddr)
{
    struct process*     pcs = process_find_by_handle(hProcess);
    struct module*      module;

    if (!pcs) return 0;
    module = module_find_by_addr(pcs, dwAddr, DMT_UNKNOWN);
    if (!module) return 0;
    return module->module.BaseOfImage;
}

/******************************************************************
 *		module_reset_debug_info
 * Removes any debug information linked to a given module.
 */
void module_reset_debug_info(struct module* module)
{
    module->sortlist_valid = TRUE;
    module->sorttab_size = 0;
    module->addr_sorttab = NULL;
    module->num_sorttab = module->num_symbols = 0;
    hash_table_destroy(&module->ht_symbols);
    module->ht_symbols.num_buckets = 0;
    module->ht_symbols.buckets = NULL;
    hash_table_destroy(&module->ht_types);
    module->ht_types.num_buckets = 0;
    module->ht_types.buckets = NULL;
    module->vtypes.num_elts = 0;
    hash_table_destroy(&module->ht_symbols);
    module->sources_used = module->sources_alloc = 0;
    module->sources = NULL;
}

/******************************************************************
 *              SymRefreshModuleList (DBGHELP.@)
 */
BOOL WINAPI SymRefreshModuleList(HANDLE hProcess)
{
    struct process*     pcs;

    TRACE("(%p)\n", hProcess);

    if (!(pcs = process_find_by_handle(hProcess))) return FALSE;

    return pcs->loader->synchronize_module_list(pcs);
}

/***********************************************************************
 *		SymFunctionTableAccess (DBGHELP.@)
 */
PVOID WINAPI SymFunctionTableAccess(HANDLE hProcess, DWORD AddrBase)
{
    return SymFunctionTableAccess64(hProcess, AddrBase);
}

/***********************************************************************
 *		SymFunctionTableAccess64 (DBGHELP.@)
 */
PVOID WINAPI SymFunctionTableAccess64(HANDLE hProcess, DWORD64 AddrBase)
{
    struct process*     pcs = process_find_by_handle(hProcess);
    struct module*      module;

    if (!pcs || !dbghelp_current_cpu->find_runtime_function) return NULL;
    module = module_find_by_addr(pcs, AddrBase, DMT_UNKNOWN);
    if (!module) return NULL;

    return dbghelp_current_cpu->find_runtime_function(module, AddrBase);
}

static BOOL native_synchronize_module_list(struct process* pcs)
{
    return FALSE;
}

static struct module* native_load_module(struct process* pcs, const WCHAR* name, ULONG_PTR addr)
{
    return NULL;
}

static BOOL native_load_debug_info(struct process* process, struct module* module)
{
    return FALSE;
}

static BOOL native_enum_modules(struct process *process, enum_modules_cb cb, void* user)
{
    return FALSE;
}

static BOOL native_fetch_file_info(struct process* process, const WCHAR* name, ULONG_PTR load_addr, DWORD_PTR* base,
                                   DWORD* size, DWORD* checksum)
{
    return FALSE;
}

const struct loader_ops no_loader_ops =
{
    native_synchronize_module_list,
    native_load_module,
    native_load_debug_info,
    native_enum_modules,
    native_fetch_file_info,
};