Demangle ti... and te... expressions (typeid).

PiperOrigin-RevId: 640616282
Change-Id: I2aa94673283d89458886f0634adec87bbf0e57de

absl/debugging/internal/demangle.cc

@@ -1995,6 +1995,8 @@ static bool ParseBracedExpression(State *state) {
 //              ::= sc <type> <expression>
 //              ::= cc <type> <expression>
 //              ::= rc <type> <expression>
+//              ::= ti <type>
+//              ::= te <expression>
 //              ::= st <type>
 //              ::= at <type>
 //              ::= az <expression>
@@ -2119,6 +2121,18 @@ static bool ParseExpression(State *state) {
   }
   state->parse_state = copy;
 
+  // typeid(type)
+  if (ParseTwoCharToken(state, "ti") && ParseType(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  // typeid(expression)
+  if (ParseTwoCharToken(state, "te") && ParseExpression(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
   // sizeof type
   if (ParseTwoCharToken(state, "st") && ParseType(state)) {
     return true;

absl/debugging/internal/demangle_test.cc

@@ -1098,6 +1098,40 @@ TEST(Demangle, ReinterpretCast) {
   EXPECT_STREQ("f<>()", tmp);
 }
 
+TEST(Demangle, TypeidType) {
+  char tmp[80];
+
+  // Source:
+  //
+  // #include <typeinfo>
+  //
+  // template <class T> decltype(typeid(T).name()) f(T) { return nullptr; }
+  // template decltype(typeid(int).name()) f<int>(int);
+  //
+  // Full LLVM demangling of the instantiation of f:
+  //
+  // decltype(typeid (int).name()) f<int>(int)
+  EXPECT_TRUE(Demangle("_Z1fIiEDTcldttiT_4nameEES0_", tmp, sizeof(tmp)));
+  EXPECT_STREQ("f<>()", tmp);
+}
+
+TEST(Demangle, TypeidExpression) {
+  char tmp[80];
+
+  // Source:
+  //
+  // #include <typeinfo>
+  //
+  // template <class T> decltype(typeid(T{}).name()) f(T) { return nullptr; }
+  // template decltype(typeid(int{}).name()) f<int>(int);
+  //
+  // Full LLVM demangling of the instantiation of f:
+  //
+  // decltype(typeid (int{}).name()) f<int>(int)
+  EXPECT_TRUE(Demangle("_Z1fIiEDTcldttetlT_E4nameEES0_", tmp, sizeof(tmp)));
+  EXPECT_STREQ("f<>()", tmp);
+}
+
 TEST(Demangle, AlignofType) {
   char tmp[80];