1 /*===- llvm-stub.c - Stub executable to run llvm bitcode files ------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This tool is used by the gccld program to enable transparent execution of 11 // bitcode files by the user. Specifically, gccld outputs two files when asked 12 // to compile a <program> file: 13 // 1. It outputs the LLVM bitcode file to <program>.bc 14 // 2. It outputs a stub executable that runs lli on <program>.bc 15 // 16 // This allows the end user to just say ./<program> and have the JIT executed 17 // automatically. On unix, the stub executable emitted is actually a bourne 18 // shell script that does the forwarding. Windows does not like #!/bin/sh 19 // programs in .exe files, so we make it an actual program, defined here. 20 // 21 //===----------------------------------------------------------------------===*/ 22 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <string.h> 26 27 #include "llvm/Config/config.h" 28 29 #if defined(HAVE_UNISTD_H) && !defined(_MSC_VER) 30 #include <unistd.h> 31 #endif 32 33 #ifdef _WIN32 34 #include <process.h> 35 #include <io.h> 36 #endif 37 38 int main(int argc, char** argv) { 39 const char *Interp = getenv("LLVMINTERP"); 40 const char **Args; 41 if (Interp == 0) Interp = "lli"; 42 43 /* Set up the command line options to pass to the JIT. */ 44 Args = (const char**)malloc(sizeof(char*) * (argc+2)); 45 /* argv[0] is the JIT */ 46 Args[0] = Interp; 47 48 #ifdef LLVM_ON_WIN32 49 { 50 int len = strlen(argv[0]); 51 if (len < 4 || strcmp(argv[0] + len - 4, ".exe") != 0) { 52 /* .exe suffix is stripped off of argv[0] if the executable was run on the 53 * command line without one. Put it back on. 54 */ 55 argv[0] = strcat(strcpy((char*)malloc(len + 5), argv[0]), ".exe"); 56 } 57 } 58 #endif 59 60 /* argv[1] is argv[0] + ".bc". */ 61 Args[1] = strcat(strcpy((char*)malloc(strlen(argv[0])+4), argv[0]), ".bc"); 62 63 /* The rest of the args are as before. */ 64 memcpy((char **)Args+2, argv+1, sizeof(char*)*argc); 65 66 /* Run the JIT. */ 67 #if !defined(_WIN32) || defined(__MINGW64__) 68 execvp(Interp, (char **)Args); /* POSIX execvp takes a char *const[]. */ 69 #else 70 execvp(Interp, Args); /* windows execvp takes a const char *const *. */ 71 #endif 72 /* if _execv returns, the JIT could not be started. */ 73 fprintf(stderr, "Could not execute the LLVM JIT. Either add 'lli' to your" 74 " path, or set the\ninterpreter you want to use in the LLVMINTERP " 75 "environment variable.\n"); 76 return 1; 77 } 78
