Add char8_t support (C++20)

This patch adds support for the char8_t type introduced in C++20
char8_t. The original patch was submitted by James Blachly  on the LLDB
mailing list [1]. I modified the patch a bit and added a test.

[1] http://lists.llvm.org/pipermail/lldb-dev/2019-August/015393.html

Differential revision: https://reviews.llvm.org/D66447

llvm-svn: 369582

3 files changed, 53 insertions, 0 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/lang/cpp/char8_t/Makefile b/lldb/packages/Python/lldbsuite/test/lang/cpp/char8_t/Makefile
new file mode 100644
index 00000000000..444da5fae9c
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/lang/cpp/char8_t/Makefile
@@ -0,0 +1,6 @@
+LEVEL = ../../../make
+
+CXX_SOURCES := main.cpp
+CFLAGS_EXTRAS := -std=c++2a -fchar8_t
+
+include $(LEVEL)/Makefile.rules
diff --git a/lldb/packages/Python/lldbsuite/test/lang/cpp/char8_t/TestCxxChar8_t.py b/lldb/packages/Python/lldbsuite/test/lang/cpp/char8_t/TestCxxChar8_t.py
new file mode 100644
index 00000000000..bca1d5a9797
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/lang/cpp/char8_t/TestCxxChar8_t.py
@@ -0,0 +1,40 @@
+# coding=utf8
+"""
+Test that C++ supports char8_t correctly.
+"""
+
+from __future__ import print_function
+
+import lldb
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+import lldbsuite.test.lldbutil as lldbutil
+
+
+class CxxChar8_tTestCase(TestBase):
+
+    mydir = TestBase.compute_mydir(__file__)
+
+    @skipIf(compiler="clang", compiler_version=['<', '7.0'])
+    def test(self):
+        """Test that C++ supports char8_t correctly."""
+        self.build()
+        exe = self.getBuildArtifact("a.out")
+
+        # Create a target by the debugger.
+        target = self.dbg.CreateTarget(exe)
+        self.assertTrue(target, VALID_TARGET)
+
+        # FIXME: We should be able to test this with target variable, but the
+        # data formatter output is broken.
+        lldbutil.run_break_set_by_symbol(self, 'main')
+        self.runCmd("run", RUN_SUCCEEDED)
+
+        self.expect(
+            "frame variable a", substrs=["(char8_t) ::a = 0x61 u8'a'"])
+
+        self.expect(
+            "frame variable ab", substrs=['(const char8_t *) ::ab', 'u8"你好"'])
+
+        self.expect(
+            "frame variable abc", substrs=['(char8_t [9]) ::abc = u8"你好"'])
diff --git a/lldb/packages/Python/lldbsuite/test/lang/cpp/char8_t/main.cpp b/lldb/packages/Python/lldbsuite/test/lang/cpp/char8_t/main.cpp
new file mode 100644
index 00000000000..b257ae2d794
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/lang/cpp/char8_t/main.cpp
@@ -0,0 +1,7 @@
+#include <cstring>
+
+char8_t a  = u8'a';
+const char8_t* ab = u8"你好";
+char8_t abc[9] = u8"你好";
+
+int main (int argc, char const *argv[]) { return 0; }