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link.d
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link.d
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/**
* Invoke the linker as a separate process.
*
* Copyright: Copyright (C) 1999-2022 by The D Language Foundation, All Rights Reserved
* Authors: $(LINK2 https://www.digitalmars.com, Walter Bright)
* License: $(LINK2 https://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Source: $(LINK2 https://github.com/dlang/dmd/blob/master/src/dmd/link.d, _link.d)
* Documentation: https://dlang.org/phobos/dmd_link.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/link.d
*/
module dmd.link;
import core.stdc.ctype;
import core.stdc.stdio;
import core.stdc.string;
import core.sys.posix.stdio;
import core.sys.posix.stdlib;
import core.sys.posix.unistd;
import core.sys.windows.winbase;
import core.sys.windows.windef;
import dmd.dmdparams;
import dmd.errors;
import dmd.globals;
import dmd.root.array;
import dmd.root.env;
import dmd.root.file;
import dmd.root.filename;
import dmd.common.outbuffer;
import dmd.common.string;
import dmd.root.rmem;
import dmd.root.string;
import dmd.utils;
import dmd.target;
import dmd.vsoptions;
version (Posix) extern (C) int pipe(int*);
version (Windows)
{
/* https://www.digitalmars.com/rtl/process.html#_spawn
* https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/spawnvp-wspawnvp?view=msvc-170
*/
extern (C)
{
int spawnlp(int, const char*, const char*, const char*, const char*);
int spawnl(int, const char*, const char*, const char*, const char*);
int spawnv(int, const char*, const char**);
int spawnvp(int, const char*, const char**);
enum _P_WAIT = 0;
}
}
// Workaround lack of 'vfork' in older druntime binding for non-Glibc
version (Posix) extern(C) pid_t vfork();
version (CRuntime_Microsoft)
{
// until the new windows bindings are available when building dmd.
static if(!is(STARTUPINFOA))
{
alias STARTUPINFOA = STARTUPINFO;
// dwCreationFlags for CreateProcess() and CreateProcessAsUser()
enum : DWORD {
DEBUG_PROCESS = 0x00000001,
DEBUG_ONLY_THIS_PROCESS = 0x00000002,
CREATE_SUSPENDED = 0x00000004,
DETACHED_PROCESS = 0x00000008,
CREATE_NEW_CONSOLE = 0x00000010,
NORMAL_PRIORITY_CLASS = 0x00000020,
IDLE_PRIORITY_CLASS = 0x00000040,
HIGH_PRIORITY_CLASS = 0x00000080,
REALTIME_PRIORITY_CLASS = 0x00000100,
CREATE_NEW_PROCESS_GROUP = 0x00000200,
CREATE_UNICODE_ENVIRONMENT = 0x00000400,
CREATE_SEPARATE_WOW_VDM = 0x00000800,
CREATE_SHARED_WOW_VDM = 0x00001000,
CREATE_FORCEDOS = 0x00002000,
BELOW_NORMAL_PRIORITY_CLASS = 0x00004000,
ABOVE_NORMAL_PRIORITY_CLASS = 0x00008000,
CREATE_BREAKAWAY_FROM_JOB = 0x01000000,
CREATE_WITH_USERPROFILE = 0x02000000,
CREATE_DEFAULT_ERROR_MODE = 0x04000000,
CREATE_NO_WINDOW = 0x08000000,
PROFILE_USER = 0x10000000,
PROFILE_KERNEL = 0x20000000,
PROFILE_SERVER = 0x40000000
}
}
}
/****************************************
* Write filename to cmdbuf, quoting if necessary.
*/
private void writeFilename(OutBuffer* buf, const(char)[] filename)
{
/* Loop and see if we need to quote
*/
foreach (const char c; filename)
{
if (isalnum(c) || c == '_')
continue;
/* Need to quote
*/
buf.writeByte('"');
buf.writestring(filename);
buf.writeByte('"');
return;
}
/* No quoting necessary
*/
buf.writestring(filename);
}
private void writeFilename(OutBuffer* buf, const(char)* filename)
{
writeFilename(buf, filename.toDString());
}
version (Posix)
{
/*****************************
* As it forwards the linker error message to stderr, checks for the presence
* of an error indicating lack of a main function (NME_ERR_MSG).
*
* Returns:
* 1 if there is a no main error
* -1 if there is an IO error
* 0 otherwise
*/
private int findNoMainError(int fd)
{
version (OSX)
{
static immutable(char*) nmeErrorMessage = "`__Dmain`, referenced from:";
}
else
{
static immutable(char*) nmeErrorMessage = "undefined reference to `_Dmain`";
}
FILE* stream = fdopen(fd, "r");
if (stream is null)
return -1;
const(size_t) len = 64 * 1024 - 1;
char[len + 1] buffer; // + '\0'
size_t beg = 0, end = len;
bool nmeFound = false;
for (;;)
{
// read linker output
const(size_t) n = fread(&buffer[beg], 1, len - beg, stream);
if (beg + n < len && ferror(stream))
return -1;
buffer[(end = beg + n)] = '\0';
// search error message, stop at last complete line
const(char)* lastSep = strrchr(buffer.ptr, '\n');
if (lastSep)
buffer[(end = lastSep - &buffer[0])] = '\0';
if (strstr(&buffer[0], nmeErrorMessage))
nmeFound = true;
if (lastSep)
buffer[end++] = '\n';
if (fwrite(&buffer[0], 1, end, stderr) < end)
return -1;
if (beg + n < len && feof(stream))
break;
// copy over truncated last line
memcpy(&buffer[0], &buffer[end], (beg = len - end));
}
return nmeFound ? 1 : 0;
}
}
version (Windows)
{
private void writeQuotedArgIfNeeded(ref OutBuffer buffer, const(char)* arg)
{
bool quote = false;
for (size_t i = 0; arg[i]; ++i)
{
if (arg[i] == '"')
{
quote = false;
break;
}
if (arg[i] == ' ')
quote = true;
}
if (quote)
buffer.writeByte('"');
buffer.writestring(arg);
if (quote)
buffer.writeByte('"');
}
unittest
{
OutBuffer buffer;
const(char)[] test(string arg)
{
buffer.reset();
buffer.writeQuotedArgIfNeeded(arg.ptr);
return buffer[];
}
assert(test("arg") == `arg`);
assert(test("arg with spaces") == `"arg with spaces"`);
assert(test(`"/LIBPATH:dir with spaces"`) == `"/LIBPATH:dir with spaces"`);
assert(test(`/LIBPATH:"dir with spaces"`) == `/LIBPATH:"dir with spaces"`);
}
}
/*****************************
* Run the linker. Return status of execution.
*/
public int runLINK()
{
const phobosLibname = finalDefaultlibname();
void setExeFile()
{
/* Generate exe file name from first obj name.
* No need to add it to cmdbuf because the linker will default to it.
*/
const char[] n = FileName.name(global.params.objfiles[0].toDString);
global.params.exefile = FileName.forceExt(n, "exe");
}
const(char)[] getMapFilename()
{
const(char)[] fn = FileName.forceExt(global.params.exefile, map_ext);
const(char)[] path = FileName.path(global.params.exefile);
return path.length ? fn : FileName.combine(global.params.objdir, fn);
}
version (Windows)
{
if (phobosLibname)
global.params.libfiles.push(phobosLibname.xarraydup.ptr);
if (target.objectFormat() == Target.ObjectFormat.coff)
{
OutBuffer cmdbuf;
cmdbuf.writestring("/NOLOGO");
for (size_t i = 0; i < global.params.objfiles.length; i++)
{
cmdbuf.writeByte(' ');
const(char)* p = global.params.objfiles[i];
writeFilename(&cmdbuf, p);
}
if (global.params.resfile)
{
cmdbuf.writeByte(' ');
writeFilename(&cmdbuf, global.params.resfile);
}
cmdbuf.writeByte(' ');
if (global.params.exefile)
{
cmdbuf.writestring("/OUT:");
writeFilename(&cmdbuf, global.params.exefile);
}
else
{
setExeFile();
}
// Make sure path to exe file exists
ensurePathToNameExists(Loc.initial, global.params.exefile);
cmdbuf.writeByte(' ');
if (global.params.mapfile)
{
cmdbuf.writestring("/MAP:");
writeFilename(&cmdbuf, global.params.mapfile);
}
else if (driverParams.map)
{
cmdbuf.writestring("/MAP:");
writeFilename(&cmdbuf, getMapFilename());
}
for (size_t i = 0; i < global.params.libfiles.length; i++)
{
cmdbuf.writeByte(' ');
cmdbuf.writestring("/DEFAULTLIB:");
writeFilename(&cmdbuf, global.params.libfiles[i]);
}
if (global.params.deffile)
{
cmdbuf.writeByte(' ');
cmdbuf.writestring("/DEF:");
writeFilename(&cmdbuf, global.params.deffile);
}
if (driverParams.symdebug)
{
cmdbuf.writeByte(' ');
cmdbuf.writestring("/DEBUG");
// in release mode we need to reactivate /OPT:REF after /DEBUG
if (global.params.release)
cmdbuf.writestring(" /OPT:REF");
}
if (driverParams.dll)
{
cmdbuf.writeByte(' ');
cmdbuf.writestring("/DLL");
}
for (size_t i = 0; i < global.params.linkswitches.length; i++)
{
cmdbuf.writeByte(' ');
cmdbuf.writeQuotedArgIfNeeded(global.params.linkswitches[i]);
}
VSOptions vsopt;
// if a runtime library (msvcrtNNN.lib) from the mingw folder is selected explicitly, do not detect VS and use lld
if (driverParams.mscrtlib.length <= 6 ||
driverParams.mscrtlib[0..6] != "msvcrt" || !isdigit(driverParams.mscrtlib[6]))
vsopt.initialize();
const(char)* linkcmd = getenv(target.is64bit ? "LINKCMD64" : "LINKCMD");
if (!linkcmd)
linkcmd = getenv("LINKCMD"); // backward compatible
if (!linkcmd)
linkcmd = vsopt.linkerPath(target.is64bit);
if (!target.is64bit && FileName.equals(FileName.name(linkcmd), "lld-link.exe"))
{
// object files not SAFESEH compliant, but LLD is more picky than MS link
cmdbuf.writestring(" /SAFESEH:NO");
// if we are using LLD as a fallback, don't link to any VS libs even if
// we detected a VS installation and they are present
vsopt.uninitialize();
}
if (const(char)* lflags = vsopt.linkOptions(target.is64bit))
{
cmdbuf.writeByte(' ');
cmdbuf.writestring(lflags);
}
cmdbuf.writeByte(0); // null terminate the buffer
char[] p = cmdbuf.extractSlice()[0 .. $-1];
const(char)[] lnkfilename;
if (p.length > 7000)
{
lnkfilename = FileName.forceExt(global.params.exefile, "lnk");
writeFile(Loc.initial, lnkfilename, p);
if (lnkfilename.length < p.length)
{
p[0] = '@';
p[1 .. lnkfilename.length +1] = lnkfilename;
p[lnkfilename.length +1] = 0;
}
}
const int status = executecmd(linkcmd, p.ptr);
if (lnkfilename)
{
lnkfilename.toCStringThen!(lf => remove(lf.ptr));
FileName.free(lnkfilename.ptr);
}
return status;
}
else if (target.objectFormat() == Target.ObjectFormat.omf)
{
OutBuffer cmdbuf;
global.params.libfiles.push("user32");
global.params.libfiles.push("kernel32");
for (size_t i = 0; i < global.params.objfiles.length; i++)
{
if (i)
cmdbuf.writeByte('+');
const(char)[] p = global.params.objfiles[i].toDString();
const(char)[] basename = FileName.removeExt(FileName.name(p));
const(char)[] ext = FileName.ext(p);
if (ext.length && !strchr(basename.ptr, '.'))
{
// Write name sans extension (but not if a double extension)
writeFilename(&cmdbuf, p[0 .. $ - ext.length - 1]);
}
else
writeFilename(&cmdbuf, p);
FileName.free(basename.ptr);
}
cmdbuf.writeByte(',');
if (global.params.exefile)
writeFilename(&cmdbuf, global.params.exefile);
else
{
setExeFile();
}
// Make sure path to exe file exists
ensurePathToNameExists(Loc.initial, global.params.exefile);
cmdbuf.writeByte(',');
if (global.params.mapfile)
writeFilename(&cmdbuf, global.params.mapfile);
else if (driverParams.map)
{
writeFilename(&cmdbuf, getMapFilename());
}
else
cmdbuf.writestring("nul");
cmdbuf.writeByte(',');
for (size_t i = 0; i < global.params.libfiles.length; i++)
{
if (i)
cmdbuf.writeByte('+');
writeFilename(&cmdbuf, global.params.libfiles[i]);
}
if (global.params.deffile)
{
cmdbuf.writeByte(',');
writeFilename(&cmdbuf, global.params.deffile);
}
/* Eliminate unnecessary trailing commas */
while (1)
{
const size_t i = cmdbuf.length;
if (!i || cmdbuf[i - 1] != ',')
break;
cmdbuf.setsize(cmdbuf.length - 1);
}
if (global.params.resfile)
{
cmdbuf.writestring("/RC:");
writeFilename(&cmdbuf, global.params.resfile);
}
if (driverParams.map || global.params.mapfile)
cmdbuf.writestring("/m");
version (none)
{
if (debuginfo)
cmdbuf.writestring("/li");
if (codeview)
{
cmdbuf.writestring("/co");
if (codeview3)
cmdbuf.writestring(":3");
}
}
else
{
if (driverParams.symdebug)
cmdbuf.writestring("/co");
}
cmdbuf.writestring("/noi");
for (size_t i = 0; i < global.params.linkswitches.length; i++)
{
cmdbuf.writestring(global.params.linkswitches[i]);
}
cmdbuf.writeByte(';');
cmdbuf.writeByte(0); //null terminate the buffer
char[] p = cmdbuf.extractSlice()[0 .. $-1];
const(char)[] lnkfilename;
if (p.length > 7000)
{
lnkfilename = FileName.forceExt(global.params.exefile, "lnk");
writeFile(Loc.initial, lnkfilename, p);
if (lnkfilename.length < p.length)
{
p[0] = '@';
p[1 .. lnkfilename.length +1] = lnkfilename;
p[lnkfilename.length +1] = 0;
}
}
const(char)* linkcmd = getenv("LINKCMD");
if (!linkcmd)
linkcmd = "optlink";
const int status = executecmd(linkcmd, p.ptr);
if (lnkfilename)
{
lnkfilename.toCStringThen!(lf => remove(lf.ptr));
FileName.free(lnkfilename.ptr);
}
return status;
}
else
{
assert(0);
}
}
else version (Posix)
{
pid_t childpid;
int status;
// Build argv[]
Strings argv;
const(char)* cc = getenv("CC");
if (!cc)
{
argv.push("cc");
}
else
{
// Split CC command to support link driver arguments such as -fpie or -flto.
char* arg = cast(char*)Mem.check(strdup(cc));
const(char)* tok = strtok(arg, " ");
while (tok)
{
argv.push(mem.xstrdup(tok));
tok = strtok(null, " ");
}
free(arg);
}
argv.append(&global.params.objfiles);
version (OSX)
{
// If we are on Mac OS X and linking a dynamic library,
// add the "-dynamiclib" flag
if (driverParams.dll)
argv.push("-dynamiclib");
}
else version (Posix)
{
if (driverParams.dll)
argv.push("-shared");
}
// None of that a.out stuff. Use explicit exe file name, or
// generate one from name of first source file.
argv.push("-o");
if (global.params.exefile)
{
argv.push(global.params.exefile.xarraydup.ptr);
}
else if (global.params.run)
{
version (all)
{
char[L_tmpnam + 14 + 1] name;
strcpy(name.ptr, P_tmpdir);
strcat(name.ptr, "/dmd_runXXXXXX");
int fd = mkstemp(name.ptr);
if (fd == -1)
{
error(Loc.initial, "error creating temporary file");
return 1;
}
else
close(fd);
global.params.exefile = name.arraydup;
argv.push(global.params.exefile.xarraydup.ptr);
}
else
{
/* The use of tmpnam raises the issue of "is this a security hole"?
* The hole is that after tmpnam and before the file is opened,
* the attacker modifies the file system to get control of the
* file with that name. I do not know if this is an issue in
* this context.
* We cannot just replace it with mkstemp, because this name is
* passed to the linker that actually opens the file and writes to it.
*/
char[L_tmpnam + 1] s;
char* n = tmpnam(s.ptr);
global.params.exefile = mem.xstrdup(n);
argv.push(global.params.exefile);
}
}
else
{
// Generate exe file name from first obj name
const(char)[] n = global.params.objfiles[0].toDString();
const(char)[] ex;
n = FileName.name(n);
if (const e = FileName.ext(n))
{
if (driverParams.dll)
ex = FileName.forceExt(ex, target.dll_ext);
else
ex = FileName.removeExt(n);
}
else
ex = "a.out"; // no extension, so give up
argv.push(ex.ptr);
global.params.exefile = ex;
}
// Make sure path to exe file exists
ensurePathToNameExists(Loc.initial, global.params.exefile);
if (driverParams.symdebug)
argv.push("-g");
if (target.is64bit)
argv.push("-m64");
else
argv.push("-m32");
version (OSX)
{
/* Without this switch, ld generates messages of the form:
* ld: warning: could not create compact unwind for __Dmain: offset of saved registers too far to encode
* meaning they are further than 255 bytes from the frame register.
* ld reverts to the old method instead.
* See: https://ghc.haskell.org/trac/ghc/ticket/5019
* which gives this tidbit:
* "When a C++ (or x86_64 Objective-C) exception is thrown, the runtime must unwind the
* stack looking for some function to catch the exception. Traditionally, the unwind
* information is stored in the __TEXT/__eh_frame section of each executable as Dwarf
* CFI (call frame information). Beginning in Mac OS X 10.6, the unwind information is
* also encoded in the __TEXT/__unwind_info section using a two-level lookup table of
* compact unwind encodings.
* The unwinddump tool displays the content of the __TEXT/__unwind_info section."
*
* A better fix would be to save the registers next to the frame pointer.
*/
argv.push("-Xlinker");
argv.push("-no_compact_unwind");
}
if (driverParams.map || global.params.mapfile.length)
{
argv.push("-Xlinker");
version (OSX)
{
argv.push("-map");
}
else
{
argv.push("-Map");
}
if (!global.params.mapfile.length)
{
const(char)[] fn = FileName.forceExt(global.params.exefile, map_ext);
const(char)[] path = FileName.path(global.params.exefile);
global.params.mapfile = path.length ? fn : FileName.combine(global.params.objdir, fn);
}
argv.push("-Xlinker");
argv.push(global.params.mapfile.xarraydup.ptr);
}
if (0 && global.params.exefile)
{
/* This switch enables what is known as 'smart linking'
* in the Windows world, where unreferenced sections
* are removed from the executable. It eliminates unreferenced
* functions, essentially making a 'library' out of a module.
* Although it is documented to work with ld version 2.13,
* in practice it does not, but just seems to be ignored.
* Thomas Kuehne has verified that it works with ld 2.16.1.
* BUG: disabled because it causes exception handling to fail
* because EH sections are "unreferenced" and elided
*/
argv.push("-Xlinker");
argv.push("--gc-sections");
}
// return true if flagp should be ordered in with the library flags
static bool flagIsLibraryRelated(const char* p)
{
const flag = p.toDString();
return startsWith(p, "-l") || startsWith(p, "-L")
|| flag == "-(" || flag == "-)"
|| flag == "--start-group" || flag == "--end-group"
|| FileName.equalsExt(p, "a")
;
}
/* Add libraries. The order of libraries passed is:
* 1. link switches without a -L prefix,
e.g. --whole-archive "lib.a" --no-whole-archive (global.params.linkswitches)
* 2. static libraries ending with *.a (global.params.libfiles)
* 3. link switches with a -L prefix (global.params.linkswitches)
* 4. libraries specified by pragma(lib), which were appended
* to global.params.libfiles. These are prefixed with "-l"
* 5. dynamic libraries passed to the command line (global.params.dllfiles)
* 6. standard libraries.
*/
// STEP 1
foreach (pi, p; global.params.linkswitches)
{
if (p && p[0] && !flagIsLibraryRelated(p))
{
if (!global.params.linkswitchIsForCC[pi])
argv.push("-Xlinker");
argv.push(p);
}
}
// STEP 2
foreach (p; global.params.libfiles)
{
if (FileName.equalsExt(p, "a"))
argv.push(p);
}
// STEP 3
foreach (pi, p; global.params.linkswitches)
{
if (p && p[0] && flagIsLibraryRelated(p))
{
if (!startsWith(p, "-l") && !startsWith(p, "-L") && !global.params.linkswitchIsForCC[pi])
{
// Don't need -Xlinker if switch starts with -l or -L.
// Eliding -Xlinker is significant for -L since it allows our paths
// to take precedence over gcc defaults.
// All other link switches were already added in step 1.
argv.push("-Xlinker");
}
argv.push(p);
}
}
// STEP 4
foreach (p; global.params.libfiles)
{
if (!FileName.equalsExt(p, "a"))
{
const plen = strlen(p);
char* s = cast(char*)mem.xmalloc(plen + 3);
s[0] = '-';
s[1] = 'l';
memcpy(s + 2, p, plen + 1);
argv.push(s);
}
}
// STEP 5
foreach (p; global.params.dllfiles)
{
argv.push(p);
}
// STEP 6
/* D runtime libraries must go after user specified libraries
* passed with -l.
*/
const libname = phobosLibname;
if (libname.length)
{
const bufsize = 2 + libname.length + 1;
auto buf = (cast(char*) malloc(bufsize))[0 .. bufsize];
Mem.check(buf.ptr);
buf[0 .. 2] = "-l";
char* getbuf(const(char)[] suffix)
{
buf[2 .. 2 + suffix.length] = suffix[];
buf[2 + suffix.length] = 0;
return buf.ptr;
}
if (libname.length > 3 + 2 && libname[0 .. 3] == "lib")
{
if (libname[$-2 .. $] == ".a")
{
argv.push("-Xlinker");
argv.push("-Bstatic");
argv.push(getbuf(libname[3 .. $-2]));
argv.push("-Xlinker");
argv.push("-Bdynamic");
}
else if (libname[$-3 .. $] == ".so")
argv.push(getbuf(libname[3 .. $-3]));
else
argv.push(getbuf(libname));
}
else
{
argv.push(getbuf(libname));
}
}
//argv.push("-ldruntime");
argv.push("-lpthread");
argv.push("-lm");
version (linux)
{
// Changes in ld for Ubuntu 11.10 require this to appear after phobos2
argv.push("-lrt");
// Link against libdl for phobos usage of dlopen
argv.push("-ldl");
}
else version (OpenBSD)
{
// Link against -lc++abi for Unwind symbols
argv.push("-lc++abi");
// Link against -lexecinfo for backtrace symbols
argv.push("-lexecinfo");
}
if (global.params.verbose)
{
// Print it
OutBuffer buf;
for (size_t i = 0; i < argv.dim; i++)
{
buf.writestring(argv[i]);
buf.writeByte(' ');
}
message(buf.peekChars());
}
argv.push(null);
// set up pipes
int[2] fds;
if (pipe(fds.ptr) == -1)
{
perror("unable to create pipe to linker");
return -1;
}
// vfork instead of fork to avoid https://issues.dlang.org/show_bug.cgi?id=21089
childpid = vfork();
if (childpid == 0)
{
// pipe linker stderr to fds[0]
dup2(fds[1], STDERR_FILENO);
close(fds[0]);
execvp(argv[0], argv.tdata());
perror(argv[0]); // failed to execute
_exit(-1);
}
else if (childpid == -1)
{
perror("unable to fork");
return -1;
}
close(fds[1]);
const(int) nme = findNoMainError(fds[0]);
waitpid(childpid, &status, 0);
if (WIFEXITED(status))
{
status = WEXITSTATUS(status);
if (status)
{
if (nme == -1)
{
perror("error with the linker pipe");
return -1;
}
else
{
error(Loc.initial, "linker exited with status %d", status);
if (nme == 1)
error(Loc.initial, "no main function specified");
}
}
}
else if (WIFSIGNALED(status))
{
error(Loc.initial, "linker killed by signal %d", WTERMSIG(status));
status = 1;
}
return status;
}
else
{
error(Loc.initial, "linking is not yet supported for this version of DMD.");
return -1;
}
}
/******************************
* Execute a rule. Return the status.
* cmd program to run
* args arguments to cmd, as a string
*/
version (Windows)
{
private int executecmd(const(char)* cmd, const(char)* args)
{
int status;
size_t len;
if (global.params.verbose)
message("%s %s", cmd, args);
if (target.objectFormat() == Target.ObjectFormat.omf)
{
if ((len = strlen(args)) > 255)
{
status = putenvRestorable("_CMDLINE", args[0 .. len]);
if (status == 0)
args = "@_CMDLINE";
else
error(Loc.initial, "command line length of %llu is too long", cast(ulong) len);
}
}
// Normalize executable path separators
// https://issues.dlang.org/show_bug.cgi?id=9330
cmd = toWinPath(cmd);
version (CRuntime_Microsoft)
{
// Open scope so dmd doesn't complain about alloca + exception handling
{
// Use process spawning through the WinAPI to avoid issues with executearg0 and spawnlp
OutBuffer cmdbuf;
cmdbuf.writestring("\"");
cmdbuf.writestring(cmd);
cmdbuf.writestring("\" ");
cmdbuf.writestring(args);
STARTUPINFOA startInf;
startInf.dwFlags = STARTF_USESTDHANDLES;
startInf.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
startInf.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
startInf.hStdError = GetStdHandle(STD_ERROR_HANDLE);
PROCESS_INFORMATION procInf;
BOOL b = CreateProcessA(null, cmdbuf.peekChars(), null, null, 1, NORMAL_PRIORITY_CLASS, null, null, &startInf, &procInf);
if (b)
{
WaitForSingleObject(procInf.hProcess, INFINITE);
DWORD returnCode;
GetExitCodeProcess(procInf.hProcess, &returnCode);
status = returnCode;
CloseHandle(procInf.hProcess);
}
else
{
status = -1;
}
}
}
else
{
status = executearg0(cmd, args);
if (status == -1)
{
status = spawnlp(0, cmd, cmd, args, null);
}
}
if (status)
{
if (status == -1)
error(Loc.initial, "can't run '%s', check PATH", cmd);
else
error(Loc.initial, "linker exited with status %d", status);
}
return status;
}
}
/**************************************
* Attempt to find command to execute by first looking in the directory
* where DMD was run from.
* Returns:
* -1 did not find command there
* !=-1 exit status from command
*/
version (Windows)
{
private int executearg0(const(char)* cmd, const(char)* args)
{
const argv0 = global.params.argv0;
//printf("argv0='%s', cmd='%s', args='%s'\n",argv0,cmd,args);
// If cmd is fully qualified, we don't do this
if (FileName.absolute(cmd.toDString()))
return -1;
const file = FileName.replaceName(argv0, cmd.toDString);
//printf("spawning '%s'\n",file);
// spawnlp returns intptr_t in some systems, not int
return spawnl(0, file.ptr, file.ptr, args, null);
}
}
/***************************************
* Run the compiled program.
* Return exit status.
*/
public int runProgram()
{
//printf("runProgram()\n");
if (global.params.verbose)
{
OutBuffer buf;
buf.writestring(global.params.exefile);
for (size_t i = 0; i < global.params.runargs.dim; ++i)
{
buf.writeByte(' ');
buf.writestring(global.params.runargs[i]);
}
message(buf.peekChars());
}
// Build argv[]
Strings argv;
argv.push(global.params.exefile.xarraydup.ptr);
for (size_t i = 0; i < global.params.runargs.dim; ++i)
{
const(char)* a = global.params.runargs[i];
version (Windows)
{
// BUG: what about " appearing in the string?
if (strchr(a, ' '))
{
char* b = cast(char*)mem.xmalloc(3 + strlen(a));
sprintf(b, "\"%s\"", a);
a = b;
}
}
argv.push(a);
}
argv.push(null);
restoreEnvVars();
version (Windows)
{
const(char)[] ex = FileName.name(global.params.exefile);
if (ex == global.params.exefile)
ex = FileName.combine(".", ex);
else
ex = global.params.exefile;
// spawnlp returns intptr_t in some systems, not int
return spawnv(0, ex.xarraydup.ptr, argv.tdata());
}
else version (Posix)
{
pid_t childpid;
int status;
childpid = fork();