[llvm-commits] CVS: llvm/tools/llvm-stub/Makefile llvm-stub.c

[Chris Lattner]

Changes in directory llvm/tools/llvm-stub:

Makefile added (r1.1)
llvm-stub.c added (r1.1)

---
Log message:

Initial checkin of a stub executable that can be used by gccld to forward to
bytecode files on systems that don't support #!/bin/sh natively (ie, win32).


---
Diffs of the changes:  (+64 -0)

Index: llvm/tools/llvm-stub/Makefile
diff -c /dev/null llvm/tools/llvm-stub/Makefile:1.1
*** /dev/null	Tue Jun  1 18:48:55 2004
--- llvm/tools/llvm-stub/Makefile	Tue Jun  1 18:48:45 2004
***************
*** 0 ****
--- 1,13 ----
+ ##===- tools/llvm-stub/Makefile ----------------------------*- Makefile -*-===##
+ # 
+ #                     The LLVM Compiler Infrastructure
+ #
+ # This file was developed by the LLVM research group and is distributed under
+ # the University of Illinois Open Source License. See LICENSE.TXT for details.
+ # 
+ ##===----------------------------------------------------------------------===##
+ 
+ LEVEL = ../..
+ TOOLNAME = llvm-stub
+ include $(LEVEL)/Makefile.common
+ 


Index: llvm/tools/llvm-stub/llvm-stub.c
diff -c /dev/null llvm/tools/llvm-stub/llvm-stub.c:1.1
*** /dev/null	Tue Jun  1 18:48:55 2004
--- llvm/tools/llvm-stub/llvm-stub.c	Tue Jun  1 18:48:45 2004
***************
*** 0 ****
--- 1,51 ----
+ /*===- llvm-stub.c - Stub executable to run llvm bytecode files -----------===//
+ // 
+ //                     The LLVM Compiler Infrastructure
+ //
+ // This file was developed by the LLVM research group and is distributed under
+ // the University of Illinois Open Source License. See LICENSE.TXT for details.
+ // 
+ //===----------------------------------------------------------------------===//
+ //
+ // This tool is used by the gccld program to enable transparent execution of
+ // bytecode files by the user.  Specifically, gccld outputs two files when asked
+ // to compile a <program> file:
+ //    1. It outputs the LLVM bytecode file to <program>.bc
+ //    2. It outputs a stub executable that runs lli on <program>.bc
+ //
+ // This allows the end user to just say ./<program> and have the JIT executed
+ // automatically.  On unix, the stub executable emitted is actually a bourne
+ // shell script that does the forwarding.  Windows doesn't not like #!/bin/sh
+ // programs in .exe files, so we make it an actual program, defined here.
+ //
+ //===----------------------------------------------------------------------===*/
+ 
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <string.h>
+ #include "Config/unistd.h"  /* provides definition of execve */
+ 
+ int main(int argc, char** argv) {
+   const char *Interp = getenv("LLVMINTERP");
+   const char **Args;
+   if (Interp == 0) Interp = "lli";
+ 
+   /* Set up the command line options to pass to the JIT. */
+   Args = (const char**)malloc(sizeof(char*) * (argc+2));
+   /* argv[0] is the JIT */
+   Args[0] = Interp;
+   /* argv[1] is argv[0] + ".bc". */
+   Args[1] = strcat(strcpy((char*)malloc(strlen(argv[0])+4), argv[0]), ".bc");
+ 
+   /* The rest of the args are as before. */
+   memcpy(Args+2, argv+1, sizeof(char*)*argc);
+ 
+   /* Run the JIT. */
+   execvp(Interp, (char *const*)Args);
+ 
+   /* if _execv returns, the JIT could not be started. */
+   fprintf(stderr, "Could not execute the LLVM JIT.  Either add 'lli' to your"
+           " path, or set the\ninterpreter you want to use in the LLVMINTERP "
+           "environment variable.\n");
+   return 1;
+ }