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runtime: Support -buildmode=c-shared.
These changes permit using the go tool from the upcoming Go 1.5 release with -buildmode=c-archive to build gccgo code into an archive file that can be linked with a C program. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@222594 138bc75d-0d04-0410-961f-82ee72b054a4
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| /* go-libmain.c -- the startup function for a Go library. | ||
| Copyright 2015 The Go Authors. All rights reserved. | ||
| Use of this source code is governed by a BSD-style | ||
| license that can be found in the LICENSE file. */ | ||
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| #include "config.h" | ||
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| #include <errno.h> | ||
| #include <pthread.h> | ||
| #include <stdlib.h> | ||
| #include <time.h> | ||
| #include <unistd.h> | ||
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| #include "runtime.h" | ||
| #include "go-alloc.h" | ||
| #include "array.h" | ||
| #include "arch.h" | ||
| #include "malloc.h" | ||
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| /* This is used when building a standalone Go library using the Go | ||
| command's -buildmode=c-archive or -buildmode=c-shared option. It | ||
| starts up the Go code as a global constructor but does not take any | ||
| other action. The main program is written in some other language | ||
| and calls exported Go functions as needed. */ | ||
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| static void die (const char *, int); | ||
| static void initfn (int, char **, char **); | ||
| static void *gostart (void *); | ||
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| /* Used to pass arguments to the thread that runs the Go startup. */ | ||
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| struct args { | ||
| int argc; | ||
| char **argv; | ||
| }; | ||
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| /* We use .init_array so that we can get the command line arguments. | ||
| This obviously assumes .init_array support; different systems may | ||
| require other approaches. */ | ||
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| typedef void (*initarrayfn) (int, char **, char **); | ||
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| static initarrayfn initarray[1] | ||
| __attribute__ ((section (".init_array"), used)) = | ||
| { initfn }; | ||
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| /* This function is called at program startup time. It starts a new | ||
| thread to do the actual Go startup, so that program startup is not | ||
| paused waiting for the Go initialization functions. Exported cgo | ||
| functions will wait for initialization to complete if | ||
| necessary. */ | ||
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| static void | ||
| initfn (int argc, char **argv, char** env __attribute__ ((unused))) | ||
| { | ||
| int err; | ||
| pthread_attr_t attr; | ||
| struct args *a; | ||
| pthread_t tid; | ||
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| a = (struct args *) malloc (sizeof *a); | ||
| if (a == NULL) | ||
| die ("malloc", errno); | ||
| a->argc = argc; | ||
| a->argv = argv; | ||
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| err = pthread_attr_init (&attr); | ||
| if (err != 0) | ||
| die ("pthread_attr_init", err); | ||
| err = pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); | ||
| if (err != 0) | ||
| die ("pthread_attr_setdetachstate", err); | ||
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| err = pthread_create (&tid, &attr, gostart, (void *) a); | ||
| if (err != 0) | ||
| die ("pthread_create", err); | ||
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| err = pthread_attr_destroy (&attr); | ||
| if (err != 0) | ||
| die ("pthread_attr_destroy", err); | ||
| } | ||
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| /* Start up the Go runtime. */ | ||
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| static void * | ||
| gostart (void *arg) | ||
| { | ||
| struct args *a = (struct args *) arg; | ||
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| runtime_isarchive = true; | ||
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| if (runtime_isstarted) | ||
| return NULL; | ||
| runtime_isstarted = true; | ||
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| runtime_check (); | ||
| runtime_args (a->argc, (byte **) a->argv); | ||
| runtime_osinit (); | ||
| runtime_schedinit (); | ||
| __go_go (runtime_main, NULL); | ||
| runtime_mstart (runtime_m ()); | ||
| abort (); | ||
| } | ||
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| /* If something goes wrong during program startup, crash. There is no | ||
| way to report failure and nobody to whom to report it. */ | ||
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| static void | ||
| die (const char *fn, int err) | ||
| { | ||
| fprintf (stderr, "%s: %d\n", fn, err); | ||
| exit (EXIT_FAILURE); | ||
| } |
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