ASAN lit support for LTO testing and add back ThinLTO test

[tejohnson]

Summary

Adds LTO support similar to test/asan/lit.cfg, modeled on the support in
compiler-rt/test/profile/lit.cfg.

Adds back reverted ThinLTO test using that support.

[eugenis]

test/asan/lit.cfg

111

Let's just not define these substitutions when lto is not supported. Any test case that uses them must REQUIRE: lto.

test/asan/TestCases/contiguous_container_crash_thinlto.cc

+// RUN: %clangxx_lto_asan -flto=thin -O %s -o %t.thinlto
+// RUN: not %run %t.thinlto crash 2>&1 | FileCheck --check-prefix=CHECK-CRASH %s
+// RUN: not %run %t.thinlto bad-bounds 2>&1 | FileCheck --check-prefix=CHECK-BAD-BOUNDS %s
+// RUN: not %run %t.thinlto bad-alignment 2>&1 | FileCheck --check-prefix=CHECK-BAD-ALIGNMENT %s
+// RUN: %env_asan_opts=detect_container_overflow=0 %run %t.thinlto crash
+//
+// Test crash due to __sanitizer_annotate_contiguous_container.
+
+// REQUIRES: lto
+
+#include <assert.h>
+#include <string.h>
+
+extern "C" {
+void __sanitizer_annotate_contiguous_container(const void *beg, const void *end,
+                                               const void *old_mid,
+                                               const void *new_mid);
+}  // extern "C"
+
+static volatile int one = 1;
+
+int TestCrash() {
+  long t[100];
+  t[60] = 0;
+  __sanitizer_annotate_contiguous_container(&t[0], &t[0] + 100, &t[0] + 100,
+                                            &t[0] + 50);
+// CHECK-CRASH: AddressSanitizer: container-overflow
+// CHECK-CRASH: if you don't care about these errors you may set ASAN_OPTIONS=detect_container_overflow=0
+  return (int)t[60 * one];  // Touches the poisoned memory.
+}
+
+void BadBounds() {
+  long t[100];
+// CHECK-BAD-BOUNDS: ERROR: AddressSanitizer: bad parameters to __sanitizer_annotate_contiguous_container
+  __sanitizer_annotate_contiguous_container(&t[0], &t[0] + 100, &t[0] + 101,
+                                            &t[0] + 50);
+}
+
+void BadAlignment() {
+  int t[100];
+// CHECK-BAD-ALIGNMENT: ERROR: AddressSanitizer: bad parameters to __sanitizer_annotate_contiguous_container
+// CHECK-BAD-ALIGNMENT: ERROR: beg is not aligned by 8
+  __sanitizer_annotate_contiguous_container(&t[1], &t[0] + 100, &t[1] + 10,
+                                            &t[0] + 50);
+}
+
+int main(int argc, char **argv) {
+  assert(argc == 2);
+  if (!strcmp(argv[1], "crash"))
+    return TestCrash();
+  else if (!strcmp(argv[1], "bad-bounds"))
+    BadBounds();
+  else if (!strcmp(argv[1], "bad-alignment"))
+    BadAlignment();
+}

test/asan/lit.cfg

 # in those modes. lit doesn't support logical feature test combinations.
 if platform.system() == 'Windows':
   if config.asan_dynamic:
     win_runtime_feature = "win32-dynamic-asan"
   else:
     win_runtime_feature = "win32-static-asan"
   config.available_features.add(win_runtime_feature)
 
-def build_invocation(compile_flags):
-  return " " + " ".join([config.compile_wrapper, config.clang] + compile_flags) + " "
+def build_invocation(compile_flags, with_lto = False):
+  lto_flags = []
+  lto_prefix = []
+  if with_lto and config.lto_supported:
+    lto_flags += config.lto_flags
+    lto_prefix += config.lto_launch
+  return " " + " ".join(lto_prefix + [config.compile_wrapper, config.clang] + lto_flags + compile_flags) + " "
 
 config.substitutions.append( ("%clang ", build_invocation(target_cflags)) )
 config.substitutions.append( ("%clangxx ", build_invocation(target_cxxflags)) )
 config.substitutions.append( ("%clang_asan ", build_invocation(clang_asan_cflags)) )
 config.substitutions.append( ("%clangxx_asan ", build_invocation(clang_asan_cxxflags)) )
+config.substitutions.append( ("%clang_lto_asan ", build_invocation(clang_asan_cflags, True)) )
+config.substitutions.append( ("%clangxx_lto_asan ", build_invocation(clang_asan_cxxflags, True)) )
 config.substitutions.append( ("%shared_libasan", "libclang_rt.asan-%s.so" % config.target_arch))
 if config.asan_dynamic:
   config.substitutions.append( ("%clang_asan_static ", build_invocation(clang_asan_static_cflags)) )
   config.substitutions.append( ("%clangxx_asan_static ", build_invocation(clang_asan_static_cxxflags)) )
 
 # Windows-specific tests might also use the clang-cl.exe driver.
 if platform.system() == 'Windows':
   clang_cl_cxxflags = ["-Wno-deprecated-declarations",