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//===-- SRPCStreamer.cpp - Stream bitcode over SRPC ----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//
//
//===----------------------------------------------------------------------===//
#if defined(__native_client__) && defined(NACL_SRPC)
#define DEBUG_TYPE "bitcode-stream"
#include "SRPCStreamer.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <errno.h>
using llvm::dbgs;
const size_t QueueStreamer::queuesize_limit_;
size_t QueueStreamer::GetBytes(unsigned char *buf, size_t len) {
size_t total_copied = 0;
pthread_mutex_lock(&Mutex);
while (!Done && queueSize() < len - total_copied) {
size_t size = queueSize();
DEBUG(dbgs() << "QueueStreamer::GetBytes len " << len << " size " <<
size << " << waiting\n");
queueGet(buf + total_copied, size);
total_copied += size;
pthread_cond_signal(&Cond);
pthread_cond_wait(&Cond, &Mutex);
}
// If this is the last partial chunk, adjust len such that the amount we
// fetch will be just the remaining bytes.
if (Done && queueSize() < len - total_copied) {
len = queueSize() + total_copied;
}
queueGet(buf + total_copied, len - total_copied);
pthread_cond_signal(&Cond);
pthread_mutex_unlock(&Mutex);
return len;
}
size_t QueueStreamer::PutBytes(unsigned char *buf, size_t len) {
size_t total_copied = 0;
pthread_mutex_lock(&Mutex);
while (capacityRemaining() < len - total_copied) {
if (Bytes.size() * 2 > queuesize_limit_) {
size_t space = capacityRemaining();
queuePut(buf + total_copied, space);
total_copied += space;
pthread_cond_signal(&Cond);
pthread_cond_wait(&Cond, &Mutex);
} else {
queueResize();
}
}
queuePut(buf + total_copied, len - total_copied);
pthread_cond_signal(&Cond);
pthread_mutex_unlock(&Mutex);
return len;
}
void QueueStreamer::SetDone() {
// Still need the lock to avoid signaling between the check and
// the wait in GetBytes.
pthread_mutex_lock(&Mutex);
Done = true;
pthread_cond_signal(&Cond);
pthread_mutex_unlock(&Mutex);
}
// Double the size of the queue. Called with Mutex to protect Cons/Prod/Bytes.
void QueueStreamer::queueResize() {
int leftover = Bytes.size() - Cons;
DEBUG(dbgs() << "resizing to " << Bytes.size() * 2 << " " << leftover << " "
<< Prod << " " << Cons << "\n");
Bytes.resize(Bytes.size() * 2);
if (Cons > Prod) {
// There are unread bytes left between Cons and the previous end of the
// buffer. Move them to the new end of the buffer.
memmove(&Bytes[Bytes.size() - leftover], &Bytes[Cons], leftover);
Cons = Bytes.size() - leftover;
}
}
// Called with Mutex held to protect Cons, Prod, and Bytes
void QueueStreamer::queuePut(unsigned char *buf, size_t len) {
size_t EndSpace = std::min(len, Bytes.size() - Prod);
DEBUG(dbgs() << "put, len " << len << " Endspace " << EndSpace << " p " <<
Prod << " c " << Cons << "\n");
// Copy up to the end of the buffer
memcpy(&Bytes[Prod], buf, EndSpace);
// Wrap around if necessary
memcpy(&Bytes[0], buf + EndSpace, len - EndSpace);
Prod = (Prod + len) % Bytes.size();
}
// Called with Mutex held to protect Cons, Prod, and Bytes
void QueueStreamer::queueGet(unsigned char *buf, size_t len) {
assert(len <= queueSize());
size_t EndSpace = std::min(len, Bytes.size() - Cons);
DEBUG(dbgs() << "get, len " << len << " Endspace " << EndSpace << " p " <<
Prod << " c " << Cons << "\n");
// Copy up to the end of the buffer
memcpy(buf, &Bytes[Cons], EndSpace);
// Wrap around if necessary
memcpy(buf + EndSpace, &Bytes[0], len - EndSpace);
Cons = (Cons + len) % Bytes.size();
}
llvm::DataStreamer *SRPCStreamer::init(void *(*Callback)(void *), void *arg,
std::string *ErrMsg) {
int err = pthread_create(&CompileThread, NULL, Callback, arg);
if (err) {
if (ErrMsg) *ErrMsg = std::string(strerror(errno));
return NULL;
}
return &Q;
}
size_t SRPCStreamer::gotChunk(unsigned char *bytes, size_t len) {
if (Error) return 0;
return Q.PutBytes(bytes, len);
}
int SRPCStreamer::streamEnd(std::string *ErrMsg) {
Q.SetDone();
int err = pthread_join(CompileThread, NULL);
if (err) {
if (ErrMsg) *ErrMsg = std::string(strerror(errno));
return err;
}
if (Error && ErrMsg) *ErrMsg = std::string("compile failed.");
return Error;
}
#endif
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