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native-wrapper.h
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native-wrapper.h
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/*
* Copyright (c) 2018 Martin Storsjo
*
* This file is part of llvm-mingw.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifdef UNICODE
#define _UNICODE
#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <tchar.h>
#include <windows.h>
#include <process.h>
#define EXECVP_CAST
#else
#include <unistd.h>
typedef char TCHAR;
#define _T(x) x
#define _tcsrchr strrchr
#define _tcschr strchr
#define _tcsdup strdup
#define _tcscpy strcpy
#define _tcslen strlen
#define _tcscmp strcmp
#define _tcsncmp strncmp
#define _tperror perror
#define _texecvp execvp
#define _tmain main
#define _ftprintf fprintf
#define _vftprintf vfprintf
#define _tunlink unlink
#define EXECVP_CAST (char **)
#endif
#ifdef _UNICODE
#define TS "%ls"
#else
#define TS "%s"
#endif
#ifdef _WIN32
static inline const TCHAR *escape(const TCHAR *str) {
// If we don't need to escape anything, just return the input string
// as is.
if (!_tcschr(str, ' ') && !_tcschr(str, '"'))
return str;
TCHAR *out = malloc((_tcslen(str) * 2 + 3) * sizeof(*out));
TCHAR *ptr = out;
int i;
*ptr++ = '"';
for (i = 0; str[i]; i++) {
if (str[i] == '"') {
int j = i - 1;
// Before all double quotes, backslashes need to be escaped, but
// not elsewhere.
while (j >= 0 && str[j--] == '\\')
*ptr++ = '\\';
// Escape the next double quote.
*ptr++ = '\\';
}
*ptr++ = str[i];
}
// Any final backslashes, before the quote around the whole argument,
// need to be doubled.
int j = i - 1;
while (j >= 0 && str[j--] == '\\')
*ptr++ = '\\';
*ptr++ = '"';
*ptr++ = '\0';
return out;
}
static inline TCHAR *concat(const TCHAR *prefix, const TCHAR *suffix);
static TCHAR *make_response_file(const TCHAR **argv) {
if (!argv[1])
return NULL;
TCHAR *temp_path = malloc(MAX_PATH * sizeof(*temp_path));
if (GetTempPath(MAX_PATH, temp_path) == 0)
return NULL;
TCHAR *rsp_file = malloc(MAX_PATH * sizeof(*rsp_file));
if (GetTempFileName(temp_path, _T("ctw"), 0, rsp_file) == 0)
return NULL;
FILE *f = _tfopen(rsp_file, _T("w, ccs=UNICODE"));
for (int i = 1; argv[i]; i++)
_ftprintf(f, _T(TS"\n"), argv[i]);
fclose(f);
argv[1] = escape(concat(_T("@"), rsp_file));
argv[2] = NULL;
return rsp_file;
}
static inline int _tspawnvp_escape(int mode, const TCHAR *filename, const TCHAR * const *argv) {
int num_args = 0;
while (argv[num_args])
num_args++;
const TCHAR **escaped_argv = malloc((num_args + 1) * sizeof(*escaped_argv));
int total = 0;
for (int i = 0; argv[i]; i++) {
escaped_argv[i] = escape(argv[i]);
total += 1 + _tcslen(escaped_argv[i]);
}
escaped_argv[num_args] = NULL;
const TCHAR *temp_file = NULL;
if (total > 32000) {
// If we are getting close to the limit, write the arguments to
// a temporary response file.
temp_file = make_response_file(escaped_argv);
if (temp_file)
total = _tcslen(escaped_argv[0]) + _tcslen(escaped_argv[1]) + 2;
}
int ret = _tspawnvp(mode, filename, escaped_argv);
if (temp_file)
DeleteFile(temp_file);
return ret;
}
#else
static inline int _tcsicmp(const TCHAR *a, const TCHAR *b) {
while (*a && tolower(*a) == tolower(*b)) {
a++;
b++;
}
return *a - *b;
}
#endif
static inline TCHAR *concat(const TCHAR *prefix, const TCHAR *suffix) {
int prefixlen = _tcslen(prefix);
int suffixlen = _tcslen(suffix);
TCHAR *buf = malloc((prefixlen + suffixlen + 1) * sizeof(*buf));
_tcscpy(buf, prefix);
_tcscpy(buf + prefixlen, suffix);
return buf;
}
static inline TCHAR *_tcsrchrs(const TCHAR *str, TCHAR char1, TCHAR char2) {
TCHAR *ptr1 = _tcsrchr(str, char1);
TCHAR *ptr2 = _tcsrchr(str, char2);
if (!ptr1)
return ptr2;
if (!ptr2)
return ptr1;
if (ptr1 < ptr2)
return ptr2;
return ptr1;
}
static inline void split_argv(const TCHAR *argv0, const TCHAR **dir_ptr, const TCHAR **basename_ptr, const TCHAR **target_ptr, const TCHAR **exe_ptr) {
const TCHAR *sep = _tcsrchrs(argv0, '/', '\\');
TCHAR *dir = _tcsdup(_T(""));
const TCHAR *basename = argv0;
if (sep) {
dir = _tcsdup(argv0);
dir[sep + 1 - argv0] = '\0';
basename = sep + 1;
}
#ifdef _WIN32
TCHAR module_path[8192];
GetModuleFileName(NULL, module_path, sizeof(module_path)/sizeof(module_path[0]));
// Try to resolve the given tool name into its long form. If the caller
// called us with a short form executable name, e.g. C__~1.EXE instead of
// c++.exe, we need to resolve the original name, so that the wrapper
// can invoke the right tool with the right arguments.
//
// CMake/Ninja generates such tool names when the tools are located in
// a path with spaces.
TCHAR long_path[8192];
int long_path_ret = GetLongPathName(module_path, long_path, sizeof(long_path)/sizeof(long_path[0]));
if (long_path_ret > 0 && long_path_ret < sizeof(long_path)/sizeof(long_path[0])) {
sep = _tcsrchrs(long_path, '/', '\\');
if (sep)
basename = _tcsdup(sep + 1);
}
TCHAR *sep2 = _tcsrchr(module_path, '\\');
if (sep2) {
sep2[1] = '\0';
dir = _tcsdup(module_path);
}
#endif
basename = _tcsdup(basename);
TCHAR *period = _tcschr(basename, '.');
if (period)
*period = '\0';
TCHAR *target = _tcsdup(basename);
TCHAR *dash = _tcsrchr(target, '-');
const TCHAR *exe = basename;
if (dash) {
*dash = '\0';
exe = dash + 1;
// Handle [<target>-]llvm-<tool> as exe=llvm-<tool>
TCHAR *dash2 = _tcsrchr(target, '-');
if (dash2 && !_tcscmp(dash2, _T("-llvm"))) {
// Found <target>-llvm-<tool>; move the llvm- prefix to
// exe. Convert the original dash which we overwrote with '\0'
// back into a dash and split the string at the preceding dash.
*dash = '-';
*dash2 = '\0';
exe = dash2 + 1;
} else if (!_tcscmp(target, _T("llvm"))) {
// Found llvm-<tool>; don't treat "llvm" as target but move
// it to the exe part.
exe = basename;
target = NULL;
}
} else {
target = NULL;
}
if (dir_ptr)
*dir_ptr = dir;
if (basename_ptr)
*basename_ptr = basename;
if (target_ptr)
*target_ptr = target;
if (exe_ptr)
*exe_ptr = exe;
}
static inline int run_final(const TCHAR *executable, const TCHAR *const *argv) {
#ifdef _WIN32
int ret = _tspawnvp_escape(_P_WAIT, executable, argv);
if (ret == -1) {
_tperror(executable);
return 1;
}
return ret;
#else
// On unix, exec() runs the target executable within this same process,
// making the return code propagate implicitly.
// Windows doesn't have such mechanisms, and the exec() family of functions
// makes the calling process exit immediately and always returning
// a zero return. This doesn't work for our case where we need the
// return code propagated.
_texecvp(executable, EXECVP_CAST argv);
_tperror(executable);
return 1;
#endif
}