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Merge to tag jdk-17.0.19+6 #2200

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21 changes: 19 additions & 2 deletions make/hotspot/lib/JvmMapfile.gmk
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
#
# Copyright (c) 2013, 2020, Oracle and/or its affiliates. All rights reserved.
# Copyright (c) 2013, 2023, Oracle and/or its affiliates. All rights reserved.
# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
#
# This code is free software; you can redistribute it and/or modify it
Expand Down Expand Up @@ -99,9 +99,26 @@ else ifeq ($(call isTargetOs, aix), true)

else ifeq ($(call isTargetOs, windows), true)
DUMP_SYMBOLS_CMD := $(DUMPBIN) -symbols *.obj

# The following lines create a list of vftable symbols to be filtered out of
# the mapfile. Removing this line causes the linker to complain about too many
# (> 64K) symbols, so the _guess_ is that this line is here to keep down the
# number of exported symbols below that limit.
#
# Some usages of C++ lambdas require the vftable symbol of classes that use
# the lambda type as a template parameter. The usage of those classes won't
# link if their vftable symbols are removed. That's why there's an exception
# for vftable symbols containing the string 'lambda'.
#
# A very simple example of a lambda usage that fails if the lambda vftable
# symbols are missing in the mapfile:
#
# #include <functional>
# std::function<void()> f = [](){}

FILTER_SYMBOLS_AWK_SCRIPT := \
'{ \
if ($$7 ~ /??_7.*@@6B@/ && $$7 !~ /type_info/) print $$7; \
if ($$7 ~ /\?\?_7.*@@6B@/ && $$7 !~ /type_info/ && $$7 !~ /lambda/) print $$7; \
}'

else
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