Sweden-Number/tools/winebuild/import.c

351 lines
11 KiB
C

/*
* DLL imports support
*
* Copyright 2000 Alexandre Julliard
*/
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include "config.h"
#include "winnt.h"
#include "build.h"
struct import
{
char *dll; /* dll name */
char **exports; /* functions exported from this dll */
int nb_exports; /* number of exported functions */
char **imports; /* functions we want to import from this dll */
int nb_imports; /* number of imported functions */
int lineno; /* line in .spec file where import is defined */
};
static char **undef_symbols; /* list of undefined symbols */
static int nb_undef_symbols = -1;
static int undef_size;
static struct import **dll_imports = NULL;
static int nb_imports = 0; /* number of imported dlls */
static int total_imports = 0; /* total number of imported functions */
/* compare function names; helper for resolve_imports */
static int name_cmp( const void *name, const void *entry )
{
return strcmp( *(char **)name, *(char **)entry );
}
/* locate a symbol in a (sorted) list */
inline static const char *find_symbol( const char *name, char **table, int size )
{
char **res = bsearch( &name, table, size, sizeof(*table), name_cmp );
return res ? *res : NULL;
}
/* sort a symbol table */
inline static void sort_symbols( char **table, int size )
{
qsort( table, size, sizeof(*table), name_cmp );
}
/* open the .so library for a given dll in a specified path */
static char *try_library_path( const char *path, const char *name )
{
char *buffer, *p;
int fd;
buffer = xmalloc( strlen(path) + strlen(name) + 8 );
sprintf( buffer, "%s/lib%s", path, name );
p = buffer + strlen(buffer) - 4;
if (!strcmp( p, ".dll" )) *p = 0;
strcat( buffer, ".so" );
/* check if the file exists */
if ((fd = open( buffer, O_RDONLY )) == -1) return NULL;
close( fd );
return buffer;
}
/* open the .so library for a given dll */
static char *open_library( const char *name )
{
char *fullname;
int i;
for (i = 0; i < nb_lib_paths; i++)
{
if ((fullname = try_library_path( lib_path[i], name ))) return fullname;
}
if (!(fullname = try_library_path( ".", name )))
fatal_error( "could not open .so file for %s\n", name );
return fullname;
}
/* read in the list of exported symbols of a .so */
static void read_exported_symbols( const char *name, struct import *imp )
{
FILE *f;
char buffer[1024];
char *fullname, *cmdline;
const char *ext;
int size, err;
imp->exports = NULL;
imp->nb_exports = size = 0;
if (!(ext = strrchr( name, '.' ))) ext = name + strlen(name);
if (!(fullname = open_library( name ))) return;
cmdline = xmalloc( strlen(fullname) + 4 );
sprintf( cmdline, "nm %s", fullname );
free( fullname );
if (!(f = popen( cmdline, "r" )))
fatal_error( "Cannot execute '%s'\n", cmdline );
while (fgets( buffer, sizeof(buffer), f ))
{
char *p = buffer + strlen(buffer) - 1;
if (p < buffer) continue;
if (*p == '\n') *p-- = 0;
if (!(p = strstr( buffer, "__wine_dllexport_" ))) continue;
p += 17;
if (strncmp( p, name, ext - name )) continue;
p += ext - name;
if (*p++ != '_') continue;
if (imp->nb_exports == size)
{
size += 128;
imp->exports = xrealloc( imp->exports, size * sizeof(*imp->exports) );
}
imp->exports[imp->nb_exports++] = xstrdup( p );
}
if ((err = pclose( f ))) fatal_error( "%s error %d\n", cmdline, err );
free( cmdline );
sort_symbols( imp->exports, imp->nb_exports );
}
/* add a dll to the list of imports */
void add_import_dll( const char *name )
{
struct import *imp = xmalloc( sizeof(*imp) );
imp->dll = xstrdup( name );
imp->imports = NULL;
imp->nb_imports = 0;
/* GetToken for the file name has swallowed the '\n', hence pointing to next line */
imp->lineno = current_line - 1;
read_exported_symbols( name, imp );
dll_imports = xrealloc( dll_imports, (nb_imports+1) * sizeof(*dll_imports) );
dll_imports[nb_imports++] = imp;
}
/* add a function to the list of imports from a given dll */
static void add_import_func( struct import *imp, const char *name )
{
imp->imports = xrealloc( imp->imports, (imp->nb_imports+1) * sizeof(*imp->imports) );
imp->imports[imp->nb_imports++] = xstrdup( name );
total_imports++;
}
/* add a symbol to the undef list */
inline static void add_undef_symbol( const char *name )
{
if (nb_undef_symbols == undef_size)
{
undef_size += 128;
undef_symbols = xrealloc( undef_symbols, undef_size * sizeof(*undef_symbols) );
}
undef_symbols[nb_undef_symbols++] = xstrdup( name );
}
/* add the extra undefined symbols that will be contained in the generated spec file itself */
static void add_extra_undef_symbols(void)
{
const char *extras[8];
int i, count = 0;
#define ADD_SYM(name) \
do { if (!find_symbol( extras[count] = (name), undef_symbols, \
nb_undef_symbols )) count++; } while(0)
sort_symbols( undef_symbols, nb_undef_symbols );
/* add symbols that will be contained in the spec file itself */
switch (SpecMode)
{
case SPEC_MODE_GUIEXE:
ADD_SYM( "GetCommandLineA" );
ADD_SYM( "GetStartupInfoA" );
ADD_SYM( "GetModuleHandleA" );
/* fall through */
case SPEC_MODE_CUIEXE:
ADD_SYM( "__wine_get_main_args" );
ADD_SYM( "ExitProcess" );
/* fall through */
case SPEC_MODE_DLL:
case SPEC_MODE_GUIEXE_NO_MAIN:
case SPEC_MODE_CUIEXE_NO_MAIN:
ADD_SYM( "RtlRaiseException" );
break;
}
if (count)
{
for (i = 0; i < count; i++) add_undef_symbol( extras[i] );
sort_symbols( undef_symbols, nb_undef_symbols );
}
}
/* warn if a given dll is not used, but check forwards first */
static void warn_unused( const struct import* imp )
{
int i, curline;
size_t len = strlen(imp->dll);
const char *p = strchr( imp->dll, '.' );
if (p && !strcasecmp( p, ".dll" )) len = p - imp->dll;
for (i = Base; i <= Limit; i++)
{
ORDDEF *odp = Ordinals[i];
if (!odp || odp->type != TYPE_FORWARD) continue;
if (!strncasecmp( odp->u.fwd.link_name, imp->dll, len ) &&
odp->u.fwd.link_name[len] == '.')
return; /* found an import, do not warn */
}
/* switch current_line temporarily to the line of the import declaration */
curline = current_line;
current_line = imp->lineno;
warning( "%s imported but no symbols used\n", imp->dll );
current_line = curline;
}
/* read in the list of undefined symbols */
void read_undef_symbols( const char *name )
{
FILE *f;
char buffer[1024];
int err;
undef_size = nb_undef_symbols = 0;
sprintf( buffer, "nm -u %s", name );
if (!(f = popen( buffer, "r" )))
fatal_error( "Cannot execute '%s'\n", buffer );
while (fgets( buffer, sizeof(buffer), f ))
{
char *p = buffer + strlen(buffer) - 1;
if (p < buffer) continue;
if (*p == '\n') *p-- = 0;
add_undef_symbol( buffer );
}
if ((err = pclose( f ))) fatal_error( "nm -u %s error %d\n", name, err );
}
/* resolve the imports for a Win32 module */
int resolve_imports( FILE *outfile )
{
int i, j, off;
char **p;
if (nb_undef_symbols == -1) return 0; /* no symbol file specified */
add_extra_undef_symbols();
for (i = 0; i < nb_imports; i++)
{
struct import *imp = dll_imports[i];
for (j = 0; j < nb_undef_symbols; j++)
{
const char *res = find_symbol( undef_symbols[j], imp->exports, imp->nb_exports );
if (res)
{
add_import_func( imp, res );
undef_symbols[j] = NULL;
}
}
/* remove all the holes in the undef symbols list */
p = undef_symbols;
for (j = off = 0; j < nb_undef_symbols; j++)
{
if (!undef_symbols[j]) off++;
else undef_symbols[j - off] = undef_symbols[j];
}
nb_undef_symbols -= off;
if (!off) warn_unused( imp );
}
return 1;
}
/* output the import table of a Win32 module */
int output_imports( FILE *outfile )
{
int i, j, pos;
if (!nb_imports) goto done;
/* main import header */
fprintf( outfile, "\nstatic struct {\n" );
fprintf( outfile, " struct {\n" );
fprintf( outfile, " void *OriginalFirstThunk;\n" );
fprintf( outfile, " unsigned int TimeDateStamp;\n" );
fprintf( outfile, " unsigned int ForwarderChain;\n" );
fprintf( outfile, " const char *Name;\n" );
fprintf( outfile, " void *FirstThunk;\n" );
fprintf( outfile, " } imp[%d];\n", nb_imports+1 );
fprintf( outfile, " const char *data[%d];\n", total_imports + nb_imports );
fprintf( outfile, "} imports = {\n {\n" );
/* list of dlls */
for (i = j = 0; i < nb_imports; i++)
{
fprintf( outfile, " { 0, 0, 0, \"%s\", &imports.data[%d] },\n",
dll_imports[i]->dll, j );
j += dll_imports[i]->nb_imports + 1;
}
fprintf( outfile, " { 0, 0, 0, 0, 0 },\n" );
fprintf( outfile, " },\n {\n" );
/* list of imported functions */
for (i = 0; i < nb_imports; i++)
{
fprintf( outfile, " /* %s */\n", dll_imports[i]->dll );
for (j = 0; j < dll_imports[i]->nb_imports; j++)
fprintf( outfile, " \"\\0\\0%s\",\n", dll_imports[i]->imports[j] );
fprintf( outfile, " 0,\n" );
}
fprintf( outfile, " }\n};\n\n" );
/* thunks for imported functions */
fprintf( outfile, "#ifndef __GNUC__\nstatic void __asm__dummy_import(void) {\n#endif\n\n" );
pos = 20 * (nb_imports + 1); /* offset of imports.data from start of imports */
fprintf( outfile, "asm(\".align 8\\n\"\n" );
for (i = 0; i < nb_imports; i++, pos += 4)
{
for (j = 0; j < dll_imports[i]->nb_imports; j++, pos += 4)
{
fprintf( outfile, " \"\\t" __ASM_FUNC("%s") "\\n\"\n",
dll_imports[i]->imports[j] );
fprintf( outfile, " \"\\t.globl " PREFIX "%s\\n\"\n",
dll_imports[i]->imports[j] );
fprintf( outfile, " \"" PREFIX "%s:\\t", dll_imports[i]->imports[j] );
if (strstr( dll_imports[i]->imports[j], "__wine_call_from_16" ))
fprintf( outfile, ".byte 0x2e\\n\\tjmp *(imports+%d)\\n\\tnop\\n\"\n", pos );
else
fprintf( outfile, "jmp *(imports+%d)\\n\\tmovl %%esi,%%esi\\n\"\n", pos );
}
}
fprintf( outfile, ");\n#ifndef __GNUC__\n}\n#endif\n\n" );
done:
return nb_imports;
}