Canonicalize conversion operators

Consider a conversion operator such as:

operator foo const* const* ();

There are two small parser problems, highlighted by this test:

(gdb) p operator foo const* const*
There is no field named operatorfoo const* const *

GDB is looking up the symbol "operatorfoo const* const*" -- it is missing a
space between the keyword "operator" and the type name "foo const* const*".

Additionally, this input of the user-defined type needs to be canonicalized
so that different "spellings" of the type are recognized:

(gdb) p operator const foo* const *
There is no field named operator const foo* const *

gdb/ChangeLog:

	* c-exp.y (oper): Canonicalize conversion operators of user-defined
	types.
	Add whitespace to front of type name.

gdb/testsuite/ChangeLog:

	* gdb.cp/cpexprs.cc (base) <operator fluff const* const*>: New
	method.
	(main): Call it.
	* gdb.cp/cpexprs.exp: Add new conversion operator to test matrix.
	Add additional user-defined conversion operator tests.

5 files changed, 40 insertions, 2 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index b5886419908..bbb0aab4191 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2017-11-18  Keith Seitz  <keiths@redhat.com>
+
+	* c-exp.y (oper): Canonicalize conversion operators of user-defined
+	types.
+	Add whitespace to front of type name.
+
 2017-10-18  Keith Seitz  <keiths@redhat.com>
 
 	* dwarf2read.c (dwarf2_add_typedef): Issue a complaint on unhandled
diff --git a/gdb/c-exp.y b/gdb/c-exp.y
index 7c050b4ce7e..18c74d8a17b 100644
--- a/gdb/c-exp.y
+++ b/gdb/c-exp.y
@@ -1554,7 +1554,7 @@ oper:	OPERATOR NEW
 	|	OPERATOR '>'
 			{ $$ = operator_stoken (">"); }
 	|	OPERATOR ASSIGN_MODIFY
-			{ const char *op = "unknown";
+			{ const char *op = " unknown";
 			  switch ($2)
 			    {
 			    case BINOP_RSH:
@@ -1630,7 +1630,13 @@ oper:	OPERATOR NEW
 
 			  c_print_type ($2, NULL, &buf, -1, 0,
 					&type_print_raw_options);
-			  $$ = operator_stoken (buf.c_str ());
+
+			  /* This also needs canonicalization.  */
+			  std::string canon
+			    = cp_canonicalize_string (buf.c_str ());
+			  if (canon.empty ())
+			    canon = std::move (buf.string ());
+			  $$ = operator_stoken ((" " + canon).c_str ());
 			}
 	;
 
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index ddfce31253d..de136451e6a 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,11 @@
+2017-11-18  Keith Seitz  <keiths@redhat.com>
+
+	* gdb.cp/cpexprs.cc (base) <operator fluff const* const*>: New
+	method.
+	(main): Call it.
+	* gdb.cp/cpexprs.exp: Add new conversion operator to test matrix.
+	Add additional user-defined conversion operator tests.
+
 2017-10-17  Pedro Alves  <palves@redhat.com>
 
 	* boards/native-stdio-gdbserver.exp: Load "local-board".
diff --git a/gdb/testsuite/gdb.cp/cpexprs.cc b/gdb/testsuite/gdb.cp/cpexprs.cc
index f70fd51603c..a2364ebe91d 100644
--- a/gdb/testsuite/gdb.cp/cpexprs.cc
+++ b/gdb/testsuite/gdb.cp/cpexprs.cc
@@ -270,6 +270,7 @@ public:
   operator int () const { return 21; } // base::operator int
   operator fluff* () const { return new fluff (); } // base::operator fluff*
   operator fluff** () const { return &g_fluff; } // base::operator fluff**
+  operator fluff const* const* () const { return &g_fluff; } // base::operator fluff const* const*
 };
 
 class base1 : public virtual base
@@ -448,6 +449,7 @@ test_function (int argc, char* argv[]) // test_function
   char* str = a;
   fluff* flp = a;
   fluff** flpp = a;
+  fluff const* const* flcpcp = a;
 
   CV_f(CV::i);
 
diff --git a/gdb/testsuite/gdb.cp/cpexprs.exp b/gdb/testsuite/gdb.cp/cpexprs.exp
index d0f41b2d8e3..463e89c12cd 100644
--- a/gdb/testsuite/gdb.cp/cpexprs.exp
+++ b/gdb/testsuite/gdb.cp/cpexprs.exp
@@ -407,6 +407,10 @@ add {base::operator int} \
     {int (const base * const)} \
     - \
     -
+add {base::operator fluff const* const*} \
+    {const fluff * const *(const base * const)} \
+    - \
+    -
 
 # Templates
 add {tclass<char>::do_something} \
@@ -746,5 +750,17 @@ gdb_test "p CV_f(CV::i)" " = 43"
 gdb_test "p CV_f('cpexprs.cc'::CV::t)" \
     { = {int \(int\)} 0x[0-9a-f]+ <CV_f\(int\)>}
 
+# Make sure conversion operator names are canonicalized and properly
+# "spelled."
+gdb_test "p base::operator const fluff * const *" \
+    [get "base::operator fluff const* const*" print] \
+    "canonicalized conversion operator name 1"
+gdb_test "p base::operator const fluff* const*" \
+    [get "base::operator fluff const* const*" print] \
+    "canonicalized conversion operator name 2"
+gdb_test "p base::operator derived*" \
+    "There is no field named operator derived\\*" \
+    "undefined conversion operator"
+
 gdb_exit
 return 0