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60 lines
2.2 KiB
C
60 lines
2.2 KiB
C
/*===- llvm-stub.c - Stub executable to run llvm bytecode files -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This tool is used by the gccld program to enable transparent execution of
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// bytecode files by the user. Specifically, gccld outputs two files when asked
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// to compile a <program> file:
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// 1. It outputs the LLVM bytecode file to <program>.bc
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// 2. It outputs a stub executable that runs lli on <program>.bc
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//
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// This allows the end user to just say ./<program> and have the JIT executed
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// automatically. On unix, the stub executable emitted is actually a bourne
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// shell script that does the forwarding. Windows does not like #!/bin/sh
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// programs in .exe files, so we make it an actual program, defined here.
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//
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//===----------------------------------------------------------------------===*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "Config/unistd.h" /* provides definition of execve */
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int main(int argc, char** argv) {
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const char *Interp = getenv("LLVMINTERP");
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const char **Args;
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if (Interp == 0) Interp = "lli";
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/* Set up the command line options to pass to the JIT. */
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Args = (const char**)malloc(sizeof(char*) * (argc+2));
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/* argv[0] is the JIT */
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Args[0] = Interp;
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#ifdef __CYGWIN32__
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/* Cygwin strips the .exe suffix off of argv[0] to "help" us. Put it back
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* on.
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*/
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argv[0] = strcat(strcpy((char*)malloc(strlen(argv[0])+5), argv[0]), ".exe");
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#endif
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/* argv[1] is argv[0] + ".bc". */
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Args[1] = strcat(strcpy((char*)malloc(strlen(argv[0])+4), argv[0]), ".bc");
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/* The rest of the args are as before. */
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memcpy(Args+2, argv+1, sizeof(char*)*argc);
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/* Run the JIT. */
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execvp(Interp, (char *const*)Args);
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/* if _execv returns, the JIT could not be started. */
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fprintf(stderr, "Could not execute the LLVM JIT. Either add 'lli' to your"
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" path, or set the\ninterpreter you want to use in the LLVMINTERP "
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"environment variable.\n");
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return 1;
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}
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