libstdc++: Add pretty printer for std::initializer_list

Re-using the std::span printer, this now shows the contents of the
initializer list instead of the pointer and length members.

Signed-off-by: Philipp Fent <fent@in.tum.de>

libstdc++-v3/ChangeLog:

	* python/libstdcxx/v6/printers.py (StdSpanPrinter._iterator):
	Rename as iterator.
	(StdInitializerListPrinter): Define new printer.
	(build_libstdcxx_dictionary): Register new printer.
	* testsuite/libstdc++-prettyprinters/cxx11.cc: Check printer for
	initializer_list.

1 files changed, 22 insertions, 2 deletions

diff --git a/libstdc++-v3/python/libstdcxx/v6/printers.py b/libstdc++-v3/python/libstdcxx/v6/printers.py
index 6d8b765..c31134b 100644
--- a/libstdc++-v3/python/libstdcxx/v6/printers.py
+++ b/libstdc++-v3/python/libstdcxx/v6/printers.py
@@ -1657,7 +1657,7 @@ class StdRegexStatePrinter:
 class StdSpanPrinter:
     "Print a std::span"
 
-    class _iterator(Iterator):
+    class iterator(Iterator):
         def __init__(self, begin, size):
             self.count = 0
             self.begin = begin
@@ -1686,7 +1686,24 @@ class StdSpanPrinter:
         return '%s of length %d' % (self.typename, self.size)
 
     def children(self):
-        return self._iterator(self.val['_M_ptr'], self.size)
+        return self.iterator(self.val['_M_ptr'], self.size)
+
+    def display_hint(self):
+        return 'array'
+
+class StdInitializerListPrinter:
+    "Print a std::initializer_list"
+
+    def __init__(self, typename, val):
+        self.typename = typename
+        self.val = val
+        self.size = val['_M_len']
+
+    def to_string(self):
+        return '%s of length %d' % (self.typename, self.size)
+
+    def children(self):
+        return StdSpanPrinter.iterator(self.val['_M_array'], self.size)
 
     def display_hint(self):
         return 'array'
@@ -2156,6 +2173,9 @@ def build_libstdcxx_dictionary ():
     libstdcxx_printer.add_version('std::tr1::', 'unordered_multiset',
                                   Tr1UnorderedSetPrinter)
 
+    libstdcxx_printer.add_version('std::', 'initializer_list',
+                                  StdInitializerListPrinter)
+
     # std::regex components
     libstdcxx_printer.add_version('std::__detail::', '_State',
                                   StdRegexStatePrinter)