1 //=- RPCChannel.inc - LLVM out-of-process JIT execution for Unix --=//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Implementation of the Unix-specific parts of the RPCChannel class
11 // which executes JITed code in a separate process from where it was built.
13 //===----------------------------------------------------------------------===//
15 #include "llvm/Support/Errno.h"
16 #include "llvm/Support/raw_ostream.h"
24 struct ConnectionData_t {
28 ConnectionData_t(int in, int out) : InputPipe(in), OutputPipe(out) {}
35 bool RPCChannel::createServer() {
40 if (pipe(PipeFD[0]) != 0 || pipe(PipeFD[1]) != 0)
41 perror("Error creating pipe: ");
48 // Close the parent ends of the pipes
52 // Use our pipes as stdin and stdout
53 if (PipeFD[0][0] != STDIN_FILENO) {
54 dup2(PipeFD[0][0], STDIN_FILENO);
57 if (PipeFD[1][1] != STDOUT_FILENO) {
58 dup2(PipeFD[1][1], STDOUT_FILENO);
62 // Execute the child process.
63 char *args[1] = { nullptr };
64 int rc = execv(ChildName.c_str(), args);
66 perror("Error executing child process: ");
70 // Close the child ends of the pipes
74 // Store the parent ends of the pipes
75 ConnectionData = (void *)new ConnectionData_t(PipeFD[1][0], PipeFD[0][1]);
81 bool RPCChannel::createClient() {
82 // Store the parent ends of the pipes
83 ConnectionData = (void *)new ConnectionData_t(STDIN_FILENO, STDOUT_FILENO);
87 void RPCChannel::Wait() { wait(nullptr); }
89 static bool CheckError(int rc, size_t Size, const char *Desc) {
91 llvm::errs() << "IO Error: " << Desc << ": " << sys::StrError() << '\n';
93 } else if ((size_t)rc != Size) {
95 char Number[10] = { 0 };
96 ErrorMsg += "Expecting ";
97 sprintf(Number, "%d", (uint32_t)Size);
99 ErrorMsg += " bytes, Got ";
100 sprintf(Number, "%d", rc);
102 llvm::errs() << "RPC Error: " << Desc << ": " << ErrorMsg << '\n';
108 bool RPCChannel::WriteBytes(const void *Data, size_t Size) {
109 int rc = write(((ConnectionData_t *)ConnectionData)->OutputPipe, Data, Size);
110 return CheckError(rc, Size, "WriteBytes");
113 bool RPCChannel::ReadBytes(void *Data, size_t Size) {
114 int rc = read(((ConnectionData_t *)ConnectionData)->InputPipe, Data, Size);
115 return CheckError(rc, Size, "ReadBytes");
118 RPCChannel::~RPCChannel() {
119 delete static_cast<ConnectionData_t *>(ConnectionData);