[Sanitizer] align allocation sizes in low level allocator

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@162676 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 9 insertions, 4 deletions

diff --git a/lib/sanitizer_common/sanitizer_allocator.cc b/lib/sanitizer_common/sanitizer_allocator.cc
index b08434ad6..45fcb230c 100644
--- a/lib/sanitizer_common/sanitizer_allocator.cc
+++ b/lib/sanitizer_common/sanitizer_allocator.cc
@@ -60,7 +60,8 @@ void *InternalAllocBlock(void *p) {
 static LowLevelAllocateCallback low_level_alloc_callback;
 
 void *LowLevelAllocator::Allocate(uptr size) {
-  CHECK((size & (size - 1)) == 0 && "size must be a power of two");
+  // Align allocation size.
+  size = RoundUpTo(size, 8);
   if (allocated_end_ - allocated_current_ < (sptr)size) {
     uptr size_to_allocate = Max(size, kPageSize);
     allocated_current_ =
diff --git a/lib/sanitizer_common/sanitizer_common.h b/lib/sanitizer_common/sanitizer_common.h
index 7c3930d8e..112de59b5 100644
--- a/lib/sanitizer_common/sanitizer_common.h
+++ b/lib/sanitizer_common/sanitizer_common.h
@@ -78,10 +78,12 @@ class InternalScopedBuffer {
   void operator=(const InternalScopedBuffer&);
 };
 
-// Simple low-level (mmap-based) allocator for internal use.
+// Simple low-level (mmap-based) allocator for internal use. Doesn't have
+// constructor, so all instances of LowLevelAllocator should be
+// linker initialized.
 class LowLevelAllocator {
  public:
-  // 'size' must be a power of two. Requires an external lock.
+  // Requires an external lock.
   void *Allocate(uptr size);
  private:
   char *allocated_end_;
diff --git a/lib/sanitizer_common/sanitizer_flags.cc b/lib/sanitizer_common/sanitizer_flags.cc
index dd28d5967..eca910c08 100644
--- a/lib/sanitizer_common/sanitizer_flags.cc
+++ b/lib/sanitizer_common/sanitizer_flags.cc
@@ -86,7 +86,8 @@ void ParseFlag(const char *env, const char **flag, const char *name) {
   int value_length;
   if (!GetFlagValue(env, name, &value, &value_length))
     return;
-  // Copy the flag value.
+  // Copy the flag value. Don't use locks here, as flags are parsed at
+  // tool startup.
   char *value_copy = (char*)(allocator_for_flags.Allocate(value_length + 1));
   internal_memcpy(value_copy, value, value_length);
   value_copy[value_length] = '\0';
diff --git a/lib/sanitizer_common/tests/sanitizer_flags_test.cc b/lib/sanitizer_common/tests/sanitizer_flags_test.cc
index 4b273e5b9..f6b7a152d 100644
--- a/lib/sanitizer_common/tests/sanitizer_flags_test.cc
+++ b/lib/sanitizer_common/tests/sanitizer_flags_test.cc
@@ -66,6 +66,7 @@ TEST(SanitizerCommon, StrFlags) {
   TestStrFlag("zzz", "--flag_name=", "");
   TestStrFlag("", "--flag_name=abc", "abc");
   TestStrFlag("", "--flag_name='abc zxc'", "abc zxc");
+  TestStrFlag("", "--flag_name='abc zxcc'", "abc zxcc");
   TestStrFlag("", "--flag_name=\"abc qwe\" asd", "abc qwe");
 }