Update LLDB snapshot to upstream r216948 (git 50f7fe44)

This is approximately "LLDB 3.5" although with a little bit of skew,
and will go along with the Clang 3.5 import.

Sponsored by:	DARPA, AFRL

1 files changed, 171 insertions, 0 deletions

diff --git a/contrib/llvm/tools/lldb/source/Host/common/Pipe.cpp b/contrib/llvm/tools/lldb/source/Host/common/Pipe.cpp
new file mode 100644
index 0000000..4db0e32
--- /dev/null
+++ b/contrib/llvm/tools/lldb/source/Host/common/Pipe.cpp
@@ -0,0 +1,171 @@
+//===-- Pipe.cpp ------------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Host/Pipe.h"
+
+#if defined(_WIN32)
+#include <io.h>
+#include <fcntl.h>
+#else
+#include <unistd.h>
+#endif
+
+using namespace lldb_private;
+
+int Pipe::kInvalidDescriptor = -1;
+
+enum PIPES { READ, WRITE }; // Constants 0 and 1 for READ and WRITE
+
+Pipe::Pipe()
+{
+    m_fds[READ] = Pipe::kInvalidDescriptor;
+    m_fds[WRITE] = Pipe::kInvalidDescriptor;
+}
+
+Pipe::~Pipe()
+{
+    Close();
+}
+
+bool
+Pipe::Open()
+{
+    if (IsValid())
+        return true;
+
+#ifdef _WIN32
+    if (::_pipe(m_fds, 256, O_BINARY) == 0)
+        return true;
+#else
+    if (::pipe(m_fds) == 0)
+        return true;
+#endif
+    m_fds[READ] = Pipe::kInvalidDescriptor;
+    m_fds[WRITE] = Pipe::kInvalidDescriptor;
+    return false;
+}
+
+int
+Pipe::GetReadFileDescriptor() const
+{
+    return m_fds[READ];
+}
+
+int
+Pipe::GetWriteFileDescriptor() const
+{
+    return m_fds[WRITE];
+}
+
+int
+Pipe::ReleaseReadFileDescriptor()
+{
+    const int fd = m_fds[READ];
+    m_fds[READ] = Pipe::kInvalidDescriptor;
+    return fd;
+}
+
+int
+Pipe::ReleaseWriteFileDescriptor()
+{
+    const int fd = m_fds[WRITE];
+    m_fds[WRITE] = Pipe::kInvalidDescriptor;
+    return fd;
+}
+
+void
+Pipe::Close()
+{
+    CloseReadFileDescriptor();
+    CloseWriteFileDescriptor();
+}
+
+bool
+Pipe::ReadDescriptorIsValid() const
+{
+    return m_fds[READ] != Pipe::kInvalidDescriptor;
+}
+
+bool
+Pipe::WriteDescriptorIsValid() const
+{
+    return m_fds[WRITE] != Pipe::kInvalidDescriptor;
+}
+
+bool
+Pipe::IsValid() const
+{
+    return ReadDescriptorIsValid() && WriteDescriptorIsValid();
+}
+
+bool
+Pipe::CloseReadFileDescriptor()
+{
+    if (ReadDescriptorIsValid())
+    {
+        int err;
+#ifdef _WIN32
+        err = _close(m_fds[READ]);
+#else
+        err = close(m_fds[READ]);
+#endif
+        m_fds[READ] = Pipe::kInvalidDescriptor;
+        return err == 0;
+    }
+    return true;
+}
+
+bool
+Pipe::CloseWriteFileDescriptor()
+{
+    if (WriteDescriptorIsValid())
+    {
+        int err;
+#ifdef _WIN32
+        err = _close(m_fds[WRITE]);
+#else
+        err = close(m_fds[WRITE]);
+#endif
+        m_fds[WRITE] = Pipe::kInvalidDescriptor;
+        return err == 0;
+    }
+    return true;
+}
+
+
+size_t
+Pipe::Read (void *buf, size_t num_bytes)
+{
+    if (ReadDescriptorIsValid())
+    {
+        const int fd = GetReadFileDescriptor();
+#ifdef _WIN32
+        return _read (fd, (char *)buf, num_bytes);
+#else
+        return read (fd, buf, num_bytes);
+#endif
+    }
+    return 0; // Return 0 since errno won't be set if we didn't call read
+}
+
+size_t
+Pipe::Write (const void *buf, size_t num_bytes)
+{
+    if (WriteDescriptorIsValid())
+    {
+        const int fd = GetWriteFileDescriptor();
+#ifdef _WIN32
+        return _write (fd, (char *)buf, num_bytes);
+#else
+        return write (fd, buf, num_bytes);
+#endif
+    }
+    return 0; // Return 0 since errno won't be set if we didn't call write
+}
+