Initial CVS checkin of gold

1 files changed, 281 insertions, 0 deletions

diff --git a/gold/fileread.cc b/gold/fileread.cc
new file mode 100644
index 0000000..a92da9d
--- /dev/null
+++ b/gold/fileread.cc
@@ -0,0 +1,281 @@
+// fileread.cc -- read files for gold
+
+#include "gold.h"
+
+#include <cassert>
+#include <cstring>
+#include <cerrno>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "options.h"
+#include "dirsearch.h"
+#include "fileread.h"
+
+namespace gold
+{
+
+// Class File_read::View.
+
+File_read::View::~View()
+{
+  assert(!this->is_locked());
+  delete[] this->data_;
+}
+
+void
+File_read::View::lock()
+{
+  ++this->lock_count_;
+}
+
+void
+File_read::View::unlock()
+{
+  assert(this->lock_count_ > 0);
+  --this->lock_count_;
+}
+
+bool
+File_read::View::is_locked()
+{
+  return this->lock_count_ > 0;
+}
+
+// Class File_read.
+
+// The File_read class is designed to support file descriptor caching,
+// but this is not currently implemented.
+
+File_read::~File_read()
+{
+  assert(this->lock_count_ == 0);
+  if (this->descriptor_ >= 0)
+    {
+      if (close(this->descriptor_) < 0)
+	fprintf(stderr, _("%s: warning: close(%s) failed: %s"),
+		program_name, this->name_.c_str(), strerror(errno));
+      this->descriptor_ = -1;
+    }
+  this->name_.clear();
+  this->clear_views(true);
+}
+
+bool
+File_read::open(const std::string& name)
+{
+  assert(this->lock_count_ == 0
+	 && this->descriptor_ < 0
+	 && this->name_.empty());
+  this->name_ = name;
+  this->descriptor_ = ::open(this->name_.c_str(), O_RDONLY);
+  ++this->lock_count_;
+  return this->descriptor_ >= 0;
+}
+
+int
+File_read::get_descriptor()
+{
+  assert(this->lock_count_ > 0);
+  return this->descriptor_;
+}
+
+void
+File_read::lock()
+{
+  ++this->lock_count_;
+}
+
+void
+File_read::unlock()
+{
+  assert(this->lock_count_ > 0);
+  --this->lock_count_;
+}
+
+bool
+File_read::is_locked()
+{
+  return this->lock_count_ > 0;
+}
+
+// See if we have a view which covers the file starting at START for
+// SIZE bytes.  Return a pointer to the View if found, NULL if not.
+
+File_read::View*
+File_read::find_view(off_t start, off_t size)
+{
+  for (std::list<File_read::View*>::iterator p = this->view_list_.begin();
+       p != this->view_list_.end();
+       ++p)
+    {
+      if ((*p)->start() <= start
+	  && (*p)->start() + (*p)->size() >= start + size)
+	return *p;
+    }
+  return NULL;
+}
+
+// Read data from the file.  Return the number of bytes read.  If
+// PBYTES is not NULL, store the number of bytes in *PBYTES, otherwise
+// require that we read exactly the number of bytes requested.
+
+off_t
+File_read::do_read(off_t start, off_t size, void* p, off_t* pbytes)
+{
+  assert(this->lock_count_ > 0);
+  int o = this->descriptor_;
+
+  if (lseek(o, start, SEEK_SET) < 0)
+    {
+      fprintf(stderr, _("%s: %s: lseek to %lld failed: %s"),
+	      program_name, this->filename().c_str(),
+	      static_cast<long long>(start),
+	      strerror(errno));
+      gold_exit(false);
+    }
+
+  off_t bytes = ::read(o, p, size);
+  if (bytes < 0)
+    {
+      fprintf(stderr, _("%s: %s: read failed: %s\n"),
+	      program_name, this->filename().c_str(), strerror(errno));
+      gold_exit(false);
+    }
+
+  if (pbytes != NULL)
+    *pbytes = bytes;
+  else if (bytes != size)
+    {
+      fprintf(stderr,
+	      _("%s: %s: file too short: read only %lld of %lld "
+		"bytes at %lld\n"),
+	      program_name, this->filename().c_str(),
+	      static_cast<long long>(bytes),
+	      static_cast<long long>(size),
+	      static_cast<long long>(start));
+      gold_exit(false);
+    }
+
+  return bytes;
+}
+
+void
+File_read::read(off_t start, off_t size, void* p, off_t* pbytes)
+{
+  assert(this->lock_count_ > 0);
+
+  File_read::View* pv = this->find_view(start, size);
+  if (pv != NULL)
+    {
+      memcpy(p, pv->data() + (start - pv->start()), size);
+      if (pbytes != NULL)
+	*pbytes = size;
+      return;
+    }
+
+  this->do_read(start, size, p, pbytes);
+}
+
+// Find an existing view or make a new one.
+
+File_read::View*
+File_read::find_or_make_view(off_t start, off_t size, off_t* pbytes)
+{
+  assert(this->lock_count_ > 0);
+
+  File_read::View* pv = this->find_view(start, size);
+  if (pv != NULL)
+    return pv;
+
+  unsigned char* p = new unsigned char[size];
+  off_t bytes = this->do_read(start, size, p, pbytes);
+  pv = new File_read::View(start, bytes, p);
+  this->view_list_.push_back(pv);
+  return pv;
+}
+
+// This implementation of get_view just reads into a memory buffer,
+// which we store on view_list_.  At some point we should support
+// mmap.
+
+const unsigned char*
+File_read::get_view(off_t start, off_t size, off_t* pbytes)
+{
+  assert(this->lock_count_ > 0);
+  File_read::View* pv = this->find_or_make_view(start, size, pbytes);
+  return pv->data() + (start - pv->start());
+}
+
+File_view*
+File_read::get_lasting_view(off_t start, off_t size, off_t* pbytes)
+{
+  assert(this->lock_count_ > 0);
+  File_read::View* pv = this->find_or_make_view(start, size, pbytes);
+  pv->lock();
+  return new File_view(*this, pv, pv->data() + (start - pv->start()));
+}
+
+// Remove all the file views.
+
+void
+File_read::clear_views(bool destroying)
+{
+  std::list<File_read::View*>::iterator p = this->view_list_.begin();
+  while (p != this->view_list_.end())
+    {
+      if ((*p)->is_locked())
+	{
+	  assert(!destroying);
+	  ++p;
+	}
+      else
+	{
+	  delete *p;
+	  p = this->view_list_.erase(p);
+	}
+    }
+}
+
+// Class File_view.
+
+File_view::~File_view()
+{
+  assert(this->file_.is_locked());
+  this->view_->unlock();
+}
+
+// Class Input_file.
+
+void
+Input_file::open(const General_options& options, const Dirsearch& dirpath)
+{
+  std::string name;
+  if (!this->input_argument_.is_lib())
+    name = this->input_argument_.name();
+  else
+    {
+      std::string n1("lib");
+      n1 += this->input_argument_.lib_basename();
+      std::string n2;
+      if (options.is_static())
+	n2 = n1 + ".so";
+      n1 += ".a";
+      name = dirpath.find(n1, n2);
+      if (name.empty())
+	{
+	  fprintf(stderr, _("%s: cannot find %s"), program_name,
+		  this->input_argument_.name());
+	  gold_exit(false);
+	}
+    }
+
+  if (!this->file_.open(name))
+    {
+      fprintf(stderr, _("%s: cannot open %s: %s"), program_name, name.c_str(),
+	      strerror(errno));
+      gold_exit(false);
+    }
+}
+
+} // End namespace gold.