gdb: add target_ops::supports_displaced_step

[deliverable/binutils-gdb.git] / gold / descriptors.cc

diff --git a/gold/descriptors.cc b/gold/descriptors.cc
index 6937741841ff2c51c5ff1d8a7d84a5868118101a..53d24c5c51c0caff5114fbfcd8b575018b9115cf 100644 (file)
--- a/gold/descriptors.cc
+++ b/gold/descriptors.cc
@@ -1,6 +1,6 @@
 // descriptors.cc -- manage file descriptors for gold
 
-// Copyright 2008, 2009 Free Software Foundation, Inc.
+// Copyright (C) 2008-2020 Free Software Foundation, Inc.
 // Written by Ian Lance Taylor <iant@google.com>.
 
 // This file is part of gold.
@@ -23,24 +23,37 @@
 #include "gold.h"
 
 #include <cerrno>
+#include <cstdio>
 #include <cstring>
 #include <fcntl.h>
+#include <string>
 #include <unistd.h>
 
+#include "debug.h"
 #include "parameters.h"
 #include "options.h"
 #include "gold-threads.h"
 #include "descriptors.h"
+#include "binary-io.h"
+
+// O_CLOEXEC is only available on newer systems.
+#ifndef O_CLOEXEC
+#define O_CLOEXEC 0
+#endif
 
 // Very old systems may not define FD_CLOEXEC.
 #ifndef FD_CLOEXEC
 #define FD_CLOEXEC 1
 #endif
 
-// O_CLOEXEC is only available on newer systems.
-#ifndef O_CLOEXEC
-#define O_CLOEXEC 0
+static inline void
+set_close_on_exec(int fd ATTRIBUTE_UNUSED)
+{
+// Mingw does not define F_SETFD.
+#ifdef F_SETFD
+  fcntl(fd, F_SETFD, FD_CLOEXEC);
 #endif
+}
 
 namespace gold
 {
@@ -51,8 +64,8 @@ namespace gold
 // adjusted downward if we run out of file descriptors.
 
 Descriptors::Descriptors()
-  : lock_(NULL), open_descriptors_(), stack_top_(-1), current_(0),
-    limit_(8192 - 16)
+  : lock_(NULL), initialize_lock_(&this->lock_), open_descriptors_(),
+    stack_top_(-1), current_(0), limit_(8192 - 16)
 {
   this->open_descriptors_.reserve(128);
 }
@@ -66,13 +79,12 @@ Descriptors::open(int descriptor, const char* name, int flags, int mode)
   // initialize a Lock until we have parsed the options to find out
   // whether we are running with threads.  We can be called before
   // options are valid when reading a linker script.
-  if (this->lock_ == NULL)
-    {
-      if (parameters->options_valid())
-       this->lock_ = new Lock();
-      else
-       gold_assert(descriptor < 0);
-    }
+  bool lock_initialized = this->initialize_lock_.initialize();
+
+  gold_assert(lock_initialized || descriptor < 0);
+
+  if (is_debugging_enabled(DEBUG_FILES))
+    this->limit_ = 8;
 
   if (descriptor >= 0)
     {
@@ -92,6 +104,8 @@ Descriptors::open(int descriptor, const char* name, int flags, int mode)
              pod->stack_next = -1;
              pod->is_on_stack = false;
            }
+         gold_debug(DEBUG_FILES, "Reused existing descriptor %d for \"%s\"",
+                    descriptor, name);
          return descriptor;
        }
     }
@@ -102,6 +116,9 @@ Descriptors::open(int descriptor, const char* name, int flags, int mode)
       // require callers to pass it.
       flags |= O_CLOEXEC;
 
+      // Always open the file as a binary file.
+      flags |= O_BINARY;
+
       int new_descriptor = ::open(name, flags, mode);
       if (new_descriptor < 0
          && errno != ENFILE
@@ -112,13 +129,14 @@ Descriptors::open(int descriptor, const char* name, int flags, int mode)
              {
                Hold_lock hl(*this->lock_);
 
-               gold_error(_("file %s was removed during the link"),
-                          this->open_descriptors_[descriptor].name);
+               gold_error(_("file %s was removed during the link"), name);
              }
 
              errno = ENOENT;
            }
 
+         gold_debug(DEBUG_FILES, "Opened new descriptor %d for \"%s\"",
+                    new_descriptor, name);
          return new_descriptor;
        }
 
@@ -130,8 +148,10 @@ Descriptors::open(int descriptor, const char* name, int flags, int mode)
          // header file but not supported by the kernel.
          // Unfortunately there doesn't seem to be any obvious way to
          // detect that, as unknown flags passed to open are ignored.
-         if (O_CLOEXEC == 0 && parameters->options().has_plugins())
-           fcntl(new_descriptor, F_SETFD, FD_CLOEXEC);
+         if (O_CLOEXEC == 0
+             && parameters->options_valid()
+             && parameters->options().has_plugins())
+           set_close_on_exec(new_descriptor);
 
          {
            Hold_optional_lock hl(this->lock_);
@@ -151,6 +171,8 @@ Descriptors::open(int descriptor, const char* name, int flags, int mode)
            if (this->current_ >= this->limit_)
              this->close_some_descriptor();
 
+           gold_debug(DEBUG_FILES, "Opened new descriptor %d for \"%s\"",
+                      new_descriptor, name);
            return new_descriptor;
          }
        }
@@ -198,6 +220,9 @@ Descriptors::release(int descriptor, bool permanent)
          pod->is_on_stack = true;
        }
     }
+
+  gold_debug(DEBUG_FILES, "Released descriptor %d for \"%s\"",
+            descriptor, pod->name);
 }
 
 // Close some descriptor.  The lock is held when this is called.  We
@@ -222,6 +247,8 @@ Descriptors::close_some_descriptor()
          if (::close(i) < 0)
            gold_warning(_("while closing %s: %s"), pod->name, strerror(errno));
          --this->current_;
+         gold_debug(DEBUG_FILES, "Closed descriptor %d for \"%s\"",
+                    i, pod->name);
          pod->name = NULL;
          if (last < 0)
            this->stack_top_ = pod->stack_next;
@@ -240,6 +267,30 @@ Descriptors::close_some_descriptor()
   return false;
 }
 
+// Close all the descriptors open for reading.
+
+void
+Descriptors::close_all()
+{
+  Hold_optional_lock hl(this->lock_);
+
+  for (size_t i = 0; i < this->open_descriptors_.size(); i++)
+    {
+      Open_descriptor* pod = &this->open_descriptors_[i];
+      if (pod->name != NULL && !pod->inuse && !pod->is_write)
+       {
+         if (::close(i) < 0)
+           gold_warning(_("while closing %s: %s"), pod->name, strerror(errno));
+         gold_debug(DEBUG_FILES, "Closed descriptor %d for \"%s\" (close_all)",
+                    static_cast<int>(i), pod->name);
+         pod->name = NULL;
+         pod->stack_next = -1;
+         pod->is_on_stack = false;
+       }
+    }
+  this->stack_top_ = -1;
+}
+
 // The single global variable which manages descriptors.
 
 Descriptors descriptors;