mirror of
https://github.com/RPCSX/llvm.git
synced 2024-12-11 13:46:13 +00:00
aab9ca73fd
amounts to checking for a completely-native version. We'll cache on a function-by-function basis instead (in the JIT's CodeEmitter). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9894 91177308-0d34-0410-b5e6-96231b3b80d8
76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
//===-- ExecveHandler.c - Replaces execve() to run LLVM files -------------===//
|
|
//
|
|
// This file implements a replacement execve() to spawn off LLVM programs to run
|
|
// transparently, without needing to be (JIT-)compiled manually by the user.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "SysUtils.h"
|
|
#include "Config/errno.h"
|
|
#include "Config/stdlib.h"
|
|
#include "Config/unistd.h"
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
/*
|
|
* This is the expected header for all valid LLVM bytecode files.
|
|
* The first four characters must be exactly this.
|
|
*/
|
|
static const char llvmHeader[] = "llvm";
|
|
|
|
/*
|
|
* This replacement execve() function first checks the file to be executed
|
|
* to see if it is a valid LLVM bytecode file, and then either invokes our
|
|
* execution environment or passes it on to the system execve() call.
|
|
*/
|
|
int execve(const char *filename, char *const argv[], char *const envp[])
|
|
{
|
|
/* Open the file, test to see if first four characters are "llvm" */
|
|
size_t headerSize = strlen(llvmHeader);
|
|
char header[headerSize];
|
|
char* realFilename = 0;
|
|
/*
|
|
* If the program is specified with a relative or absolute path,
|
|
* then just use the path and filename as is, otherwise search for it.
|
|
*/
|
|
if (filename[0] != '.' && filename[0] != '/')
|
|
realFilename = FindExecutable(filename);
|
|
else
|
|
realFilename = (char*) filename;
|
|
if (!realFilename) {
|
|
fprintf(stderr, "Cannot find path to `%s', exiting.\n", filename);
|
|
return -1;
|
|
}
|
|
errno = 0;
|
|
int file = open(realFilename, O_RDONLY);
|
|
/* Check validity of `file' */
|
|
if (errno) return EIO;
|
|
/* Read the header from the file */
|
|
ssize_t bytesRead = read(file, header, headerSize);
|
|
close(file);
|
|
if (bytesRead != (ssize_t)headerSize) return EIO;
|
|
if (!memcmp(llvmHeader, header, headerSize)) {
|
|
/*
|
|
* This is a bytecode file, so execute the JIT with the program and
|
|
* parameters.
|
|
*/
|
|
unsigned argvSize, idx;
|
|
for (argvSize = 0, idx = 0; argv[idx] && argv[idx][0]; ++idx)
|
|
++argvSize;
|
|
char **LLIargs = (char**) malloc(sizeof(char*) * (argvSize+2));
|
|
char *LLIpath = FindExecutable("lli");
|
|
if (!LLIpath) {
|
|
fprintf(stderr, "Cannot find path to `lli', exiting.\n");
|
|
return -1;
|
|
}
|
|
LLIargs[0] = LLIpath;
|
|
LLIargs[1] = realFilename;
|
|
for (idx = 1; idx != argvSize; ++idx)
|
|
LLIargs[idx+1] = argv[idx];
|
|
LLIargs[argvSize + 1] = '\0';
|
|
return executeProgram(LLIpath, LLIargs, envp);
|
|
}
|
|
return executeProgram(filename, argv, envp);
|
|
}
|