[sanitizer_common] Added 64-bit signed flag parser.

[hctim]

Summary

Adds a 64-bit signed flag parser for GWP-ASan's use.

[vitalybuka]

Test?

[hctim]

Added test. Still validating locally, but it can take a while...

[hctim]

Accidentally forgot to amend the commit before submitting, so the unit test was spliced off. It's in rL359632.

compiler-rt/lib/sanitizer_common/sanitizer_flag_parser.h

 inline bool FlagHandler<uptr>::Parse(const char *value) {
   const char *value_end;
   *t_ = internal_simple_strtoll(value, &value_end, 10);
   bool ok = *value_end == 0;
   if (!ok) Printf("ERROR: Invalid value for uptr option: '%s'\n", value);
   return ok;
 }
 
+template <>
+inline bool FlagHandler<s64>::Parse(const char *value) {
+  const char *value_end;
+  *t_ = internal_simple_strtoll(value, &value_end, 10);
+  bool ok = *value_end == 0;
+  if (!ok) Printf("ERROR: Invalid value for s64 option: '%s'\n", value);
+  return ok;
+}
+
 class FlagParser {
   static const int kMaxFlags = 200;
   struct Flag {
     const char *name;
     const char *desc;
     FlagHandlerBase *handler;
   } *flags_;
   int n_flags_;

compiler-rt/lib/sanitizer_common/tests/sanitizer_flags_test.cc

 //===----------------------------------------------------------------------===//
 #include "sanitizer_common/sanitizer_common.h"
 #include "sanitizer_common/sanitizer_flags.h"
 #include "sanitizer_common/sanitizer_flag_parser.h"
 #include "sanitizer_common/sanitizer_libc.h"
 #include "sanitizer_common/sanitizer_allocator_internal.h"
 #include "gtest/gtest.h"
 
+#include <stdint.h>
 #include <string.h>
 
 namespace __sanitizer {
 
 static const char kFlagName[] = "flag_name";
 static const char kFlagDesc[] = "flag description";
 
 template <typename T>
TEST(SanitizerCommon, IntFlags) {
   TestFlag(-11, "--flag_name=42", -11);
   TestFlag(-11, "zzzzzzz=42", -11);
 
   EXPECT_DEATH(TestFlag(-11, "flag_name", 0), "expected '='");
   EXPECT_DEATH(TestFlag(-11, "flag_name=42U", 0),
                "Invalid value for int option");
 }
 
+TEST(SanitizerCommon, LongLongIntFlags) {
+  s64 InitValue = -5;
+  s64 IntMin = INT64_MIN;
+  s64 IntMax = INT64_MAX;
+  TestFlag(InitValue, "flag_name=0", 0ll);
+  TestFlag(InitValue, "flag_name=42", 42ll);
+  TestFlag(InitValue, "flag_name=-42", -42ll);
+
+  TestFlag(InitValue, "flag_name=-9223372036854775808", IntMin);
+  TestFlag(InitValue, "flag_name=9223372036854775807", IntMax);
+
+  TestFlag(InitValue, "flag_name=-92233720368547758080000", IntMin);
+  TestFlag(InitValue, "flag_name=92233720368547758070000", IntMax);
+}
+
 TEST(SanitizerCommon, StrFlags) {
   TestFlag("zzz", 0, "zzz");
   TestFlag("zzz", "flag_name=", "");
   TestFlag("zzz", "flag_name=abc", "abc");
   TestFlag("", "flag_name=abc", "abc");
   TestFlag("", "flag_name='abc zxc'", "abc zxc");
   // TestStrFlag("", "flag_name=\"abc qwe\" asd", "abc qwe");
 }