[clang] [clang-format] Support of TableGen basic format restrictions. (PR #81611)

[Björn Schäpers via cfe-commits]

================
@@ -55,5 +59,271 @@ TEST_F(FormatTestTableGen, NoSpacesInSquareBracketLists) {
   verifyFormat("def flag : Flag<[\"-\", \"--\"], \"foo\">;");
 }
 
+TEST_F(FormatTestTableGen, LiteralsAndIdentifiers) {
+  verifyFormat("def LiteralAndIdentifiers {\n"
+               "  let someInteger = -42;\n"
+               "  let 0startID = $TokVarName;\n"
+               "  let 0xstartInteger = 0x42;\n"
+               "  let someIdentifier = $TokVarName;\n"
+               "}\n");
+}
+
+TEST_F(FormatTestTableGen, BangOperators) {
+  verifyFormat("def BangOperators {\n"
+               "  let IfOpe = !if(\n"
+               "      !not(!and(!gt(!add(1, 2), !sub(3, 4)), !isa<Ty>($x))),\n"
+               "      !foldl(0, !listconcat(!range(5, 6), !range(7, 8)),\n"
+               "             total, rec, !add(total, rec.Number)),\n"
+               "      !tail(!range(9, 10)));\n"
+               "  let ForeachOpe = !foreach(\n"
+               "      arg, arglist,\n"
+               "      !if(!isa<SomeType>(arg.Type),\n"
+               "          !add(!cast<SomeOtherType>(arg).Number, x), arg));\n"
+               "  let CondOpe1 = !cond(!eq(size, 1): 1,\n"
+               "                       !eq(size, 2): 1,\n"
+               "                       !eq(size, 4): 1,\n"
+               "                       !eq(size, 8): 1,\n"
+               "                       !eq(size, 16): 1,\n"
+               "                       true: 0);\n"
+               "  let CondOpe2 = !cond(!lt(x, 0): \"negativenegative\",\n"
+               "                       !eq(x, 0): \"zerozero\",\n"
+               "                       true: \"positivepositive\");\n"
+               "  let CondOpe2WithComment = !cond(!lt(x, 0):  // negative\n"
+               "                                  \"negativenegative\",\n"
+               "                                  !eq(x, 0):  // zero\n"
+               "                                  \"zerozero\",\n"
+               "                                  true:  // default\n"
+               "                                  \"positivepositive\");\n"
+               "}\n");
+}
+
+TEST_F(FormatTestTableGen, Include) {
+  verifyFormat("include \"test/IncludeFile.h\"\n");
+}
+
+TEST_F(FormatTestTableGen, Types) {
+  verifyFormat("def Types : list<int>, bits<3>, list<list<string>> {}\n");
+}
+
+TEST_F(FormatTestTableGen, SimpleValue1_SingleLiterals) {
+  verifyFormat("def SimpleValue {\n"
+               "  let Integer = 42;\n"
+               "  let String = \"some string\";\n"
+               "}\n");
+}
+
+TEST_F(FormatTestTableGen, SimpleValue1_MultilineString) {
+  // test::messUp does not understand multiline TableGen code-literals.
+  // We have to give the result and the strings to format manually.
+  std::string DefWithCode =
----------------
HazardyKnusperkeks wrote:

```suggestion
  StringRef DefWithCode =
```
No need to allocate.

https://github.com/llvm/llvm-project/pull/81611