[sancov] sanitizer coverage initialization test

[aizatsky]

Summary

Reflects the change in https://reviews.llvm.org/D29662

[kcc]

test/sanitizer_common/TestCases/sanitizer_coverage_trace_pc_guard-init.cc

5

can we use REQUIRES instead of XFAIL?

[aizatsky]

replaced XFAIL with REQUIRES.

[aizatsky]

XFAIL on tsan.

[kcc]

LGTM

test/sanitizer_common/TestCases/sanitizer_coverage_trace_pc_guard-init.cc

+// Tests trace pc guard coverage collection.
+//
+// REQUIRES: has_sancovcc,stable-runtime,x86_64-linux
+//
+// RUN: DIR=%t_workdir
+// RUN: CLANG_ARGS="-O0 -fsanitize-coverage=trace-pc-guard"
+// RUN: rm -rf $DIR
+// RUN: mkdir -p $DIR
+// RUN: cd $DIR
+// RUN: %clangxx -DSHARED1 $CLANG_ARGS -shared %s -o %t_1.so -fPIC
+// RUN: %clangxx -DSTATIC1 $CLANG_ARGS %s -c -o %t_2.o
+// RUN: %clangxx -DMAIN $CLANG_ARGS %s -o %t %t_1.so %t_2.o
+// RUN: %env_tool_opts=coverage=1 %t 2>&1 | FileCheck %s
+// RUN: rm -rf $DIR
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+extern "C" {
+  int bar();
+  int baz();
+}
+
+#ifdef MAIN
+
+extern "C" void __sanitizer_cov_trace_pc_guard_init(uint32_t *start, uint32_t *stop) {
+  fprintf(stderr, "__sanitizer_cov_trace_pc_guard_init\n");
+}
+
+extern "C" void __sanitizer_cov_trace_pc_guard(uint32_t *guard) { }
+
+
+int foo() {
+  fprintf(stderr, "foo\n");
+  return 1;
+}
+
+int main() {
+  fprintf(stderr, "main\n");
+  foo();
+  bar();
+  baz();
+}
+
+#endif // MAIN
+
+extern "C" {
+
+#ifdef SHARED1
+int bar() {
+  fprintf(stderr, "bar\n");
+  return 1;
+}
+#endif
+
+#ifdef STATIC1
+int baz() {
+  fprintf(stderr, "baz\n");
+  return 1;
+}
+#endif
+
+} // extern "C"
+
+// Init is called once per DSO.
+// CHECK: __sanitizer_cov_trace_pc_guard_init
+// CHECK-NEXT: __sanitizer_cov_trace_pc_guard_init
+// CHECK-NEXT: main
+// CHECK-NEXT: foo
+// CHECK-NEXT: bar
+// CHECK-NEXT: baz