RemoteTargetExternal.inc revision 259698 
1//=- RemoteTargetExternal.inc - LLVM out-of-process JIT execution for Unix --=//
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// Implementation of the Unix-specific parts of the RemoteTargetExternal class
11// which executes JITed code in a separate process from where it was built.
12//
13//===----------------------------------------------------------------------===//
14
15#include <unistd.h>
16#include <stdio.h>
17#include <stdlib.h>
18#include <sys/wait.h>
19
20namespace {
21
22struct ConnectionData_t {
23  int InputPipe;
24  int OutputPipe;
25
26  ConnectionData_t(int in, int out) : InputPipe(in), OutputPipe(out) {}
27};
28
29} // namespace
30
31namespace llvm {
32
33void RemoteTargetExternal::create() {
34  int PipeFD[2][2];
35  pid_t ChildPID;
36
37  // Create two pipes.
38  if (pipe(PipeFD[0]) != 0 || pipe(PipeFD[1]) != 0)
39    perror("Error creating pipe: ");
40
41  ChildPID = fork();
42
43  if (ChildPID == 0) {
44    // In the child...
45
46    // Close the parent ends of the pipes
47    close(PipeFD[0][1]);
48    close(PipeFD[1][0]);
49
50    // Use our pipes as stdin and stdout
51    if (PipeFD[0][0] != STDIN_FILENO) {
52      dup2(PipeFD[0][0], STDIN_FILENO);
53      close(PipeFD[0][0]);
54    }
55    if (PipeFD[1][1] != STDOUT_FILENO) {
56      dup2(PipeFD[1][1], STDOUT_FILENO);
57      close(PipeFD[1][1]);
58    }
59
60    // Execute the child process.
61    char *args[1] = { NULL };
62    int rc = execv(ChildName.c_str(), args);
63    if (rc != 0)
64      perror("Error executing child process: ");
65  }
66  else {
67    // In the parent...
68
69    // Close the child ends of the pipes
70    close(PipeFD[0][0]);
71    close(PipeFD[1][1]);
72
73    // Store the parent ends of the pipes
74    ConnectionData = (void*)new ConnectionData_t(PipeFD[1][0], PipeFD[0][1]);
75
76    Receive(LLI_ChildActive);
77  }
78}
79
80int RemoteTargetExternal::WriteBytes(const void *Data, size_t Size) {
81  return write(((ConnectionData_t*)ConnectionData)->OutputPipe, Data, Size);
82}
83
84int RemoteTargetExternal::ReadBytes(void *Data, size_t Size) {
85  return read(((ConnectionData_t*)ConnectionData)->InputPipe, Data, Size);
86}
87
88void RemoteTargetExternal::Wait() {
89  wait(NULL);
90}
91
92RemoteTargetExternal::~RemoteTargetExternal() {
93  delete static_cast<ConnectionData_t *>(ConnectionData);
94}
95
96} // namespace llvm
97