From bae7f79e03d6405f5ceec0e3e24671e6b30f29ed Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@google.com>
Date: Fri, 4 Aug 2006 23:10:59 +0000
Subject: Initial CVS checkin of gold

---
 gold/readsyms.cc | 123 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 gold/readsyms.cc

(limited to 'gold/readsyms.cc')

diff --git a/gold/readsyms.cc b/gold/readsyms.cc
new file mode 100644
index 0000000..30b341c
--- /dev/null
+++ b/gold/readsyms.cc
@@ -0,0 +1,123 @@
+// readsyms.cc -- read input file symbols for gold
+
+#include "gold.h"
+
+#include <cstring>
+
+#include "elfcpp.h"
+#include "options.h"
+#include "dirsearch.h"
+#include "readsyms.h"
+
+namespace gold
+{
+
+// Class read_symbols.
+
+Read_symbols::~Read_symbols()
+{
+  // The this_blocker_ and next_blocker_ pointers are passed on to the
+  // Add_symbols task.
+}
+
+// Return whether a Read_symbols task is runnable.  We need write
+// access to the symbol table.  We can read an ordinary input file
+// immediately.  For an archive specified using -l, we have to wait
+// until the search path is complete.
+
+Task::Is_runnable_type
+Read_symbols::is_runnable(Workqueue*)
+{
+  if (this->input_.is_lib() && this->dirpath_.token().is_blocked())
+    return IS_BLOCKED;
+
+  return IS_RUNNABLE;
+}
+
+// Return a Task_locker for a Read_symbols task.  We don't need any
+// locks here.
+
+Task_locker*
+Read_symbols::locks(Workqueue*)
+{
+  return NULL;
+}
+
+// Run a Read_symbols task.  This is where we actually read the
+// symbols and relocations.
+
+void
+Read_symbols::run(Workqueue* workqueue)
+{
+  // We don't keep track of Input_file objects, so this is a memory
+  // leak.
+  Input_file* input_file = new Input_file(this->input_);
+  input_file->open(this->options_, this->dirpath_);
+
+  // Read enough of the file to pick up the entire ELF header.
+
+  int ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size;
+  off_t bytes;
+  const unsigned char* p = input_file->file().get_view(0, ehdr_size, &bytes);
+  if (bytes >= 4)
+    {
+      static unsigned char elfmagic[4] =
+	{
+	  elfcpp::ELFMAG0, elfcpp::ELFMAG1,
+	  elfcpp::ELFMAG2, elfcpp::ELFMAG3
+	};
+      if (memcmp(p, elfmagic, 4) == 0)
+	{
+	  // This is an ELF object.
+	  Object* obj = make_elf_object(this->input_.name(), input_file, 0,
+					p, bytes);
+					
+	  Read_symbols_data sd = obj->read_symbols();
+	  workqueue->queue(new Add_symbols(obj, sd, this->this_blocker_,
+					   this->next_blocker_));
+
+	  // Opening the file locked it, so now we need to unlock it.
+	  input_file->file().unlock();
+
+	  return;
+	}
+    }
+
+  // Here we have to handle archives and any other input file
+  // types we need.
+  gold_fatal("only objects are currently supported", false);
+}
+
+// Class Add_symbols.
+
+Add_symbols::~Add_symbols()
+{
+  if (this->this_blocker_ != NULL)
+    delete this->this_blocker_;
+  // next_blocker_ is deleted by the task associated with the next
+  // input file.
+}
+
+// We are blocked by this_blocker_.  We block next_blocker_.
+
+Task::Is_runnable_type
+Add_symbols::is_runnable(Workqueue*)
+{
+  if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
+    return IS_BLOCKED;
+  return IS_RUNNABLE;
+}
+
+Task_locker*
+Add_symbols::locks(Workqueue* workqueue)
+{
+  return new Task_locker_block(*this->next_blocker_, workqueue);
+}
+
+void
+Add_symbols::run(Workqueue*)
+{
+  this->object_->add_symbols(this->sd_);
+}
+
+} // End namespace gold.
-- 
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