Initial checkin of GCC 4.9.0 from trunk (r208799).

Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba

1 files changed, 103 insertions, 0 deletions

diff --git a/gcc-4.9/libsanitizer/sanitizer_common/sanitizer_libignore.cc b/gcc-4.9/libsanitizer/sanitizer_common/sanitizer_libignore.cc
new file mode 100644
index 000000000..310e811df
--- /dev/null
+++ b/gcc-4.9/libsanitizer/sanitizer_common/sanitizer_libignore.cc
@@ -0,0 +1,103 @@
+//===-- sanitizer_libignore.cc --------------------------------------------===//
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_platform.h"
+#if SANITIZER_LINUX
+
+#include "sanitizer_libignore.h"
+#include "sanitizer_flags.h"
+#include "sanitizer_procmaps.h"
+
+namespace __sanitizer {
+
+LibIgnore::LibIgnore(LinkerInitialized) {
+}
+
+void LibIgnore::Init(const SuppressionContext &supp) {
+  BlockingMutexLock lock(&mutex_);
+  CHECK_EQ(count_, 0);
+  const uptr n = supp.SuppressionCount();
+  for (uptr i = 0; i < n; i++) {
+    const Suppression *s = supp.SuppressionAt(i);
+    if (s->type != SuppressionLib)
+      continue;
+    if (count_ >= kMaxLibs) {
+      Report("%s: too many called_from_lib suppressions (max: %d)\n",
+             SanitizerToolName, kMaxLibs);
+      Die();
+    }
+    Lib *lib = &libs_[count_++];
+    lib->templ = internal_strdup(s->templ);
+    lib->name = 0;
+    lib->loaded = false;
+  }
+}
+
+void LibIgnore::OnLibraryLoaded(const char *name) {
+  BlockingMutexLock lock(&mutex_);
+  // Try to match suppressions with symlink target.
+  InternalScopedBuffer<char> buf(4096);
+  if (name != 0 && internal_readlink(name, buf.data(), buf.size() - 1) > 0 &&
+      buf.data()[0]) {
+    for (uptr i = 0; i < count_; i++) {
+      Lib *lib = &libs_[i];
+      if (!lib->loaded && lib->real_name == 0 &&
+          TemplateMatch(lib->templ, name))
+        lib->real_name = internal_strdup(buf.data());
+    }
+  }
+
+  // Scan suppressions list and find newly loaded and unloaded libraries.
+  MemoryMappingLayout proc_maps(/*cache_enabled*/false);
+  InternalScopedBuffer<char> module(4096);
+  for (uptr i = 0; i < count_; i++) {
+    Lib *lib = &libs_[i];
+    bool loaded = false;
+    proc_maps.Reset();
+    uptr b, e, off, prot;
+    while (proc_maps.Next(&b, &e, &off, module.data(), module.size(), &prot)) {
+      if ((prot & MemoryMappingLayout::kProtectionExecute) == 0)
+        continue;
+      if (TemplateMatch(lib->templ, module.data()) ||
+          (lib->real_name != 0 &&
+          internal_strcmp(lib->real_name, module.data()) == 0)) {
+        if (loaded) {
+          Report("%s: called_from_lib suppression '%s' is matched against"
+                 " 2 libraries: '%s' and '%s'\n",
+                 SanitizerToolName, lib->templ, lib->name, module.data());
+          Die();
+        }
+        loaded = true;
+        if (lib->loaded)
+          continue;
+        if (common_flags()->verbosity)
+          Report("Matched called_from_lib suppression '%s' against library"
+              " '%s'\n", lib->templ, module.data());
+        lib->loaded = true;
+        lib->name = internal_strdup(module.data());
+        const uptr idx = atomic_load(&loaded_count_, memory_order_relaxed);
+        code_ranges_[idx].begin = b;
+        code_ranges_[idx].end = e;
+        atomic_store(&loaded_count_, idx + 1, memory_order_release);
+      }
+    }
+    if (lib->loaded && !loaded) {
+      Report("%s: library '%s' that was matched against called_from_lib"
+             " suppression '%s' is unloaded\n",
+             SanitizerToolName, lib->name, lib->templ);
+      Die();
+    }
+  }
+}
+
+void LibIgnore::OnLibraryUnloaded() {
+  OnLibraryLoaded(0);
+}
+
+}  // namespace __sanitizer
+
+#endif  // #if SANITIZER_LINUX