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Go patch committed: Always put descriptor wrappers in their own section
- From: Ian Lance Taylor <iant at google dot com>
- To: gcc-patches at gcc dot gnu dot org, gofrontend-dev at googlegroups dot com
- Date: Fri, 02 Aug 2013 10:02:45 -0700
- Subject: Go patch committed: Always put descriptor wrappers in their own section
This patch to the Go frontend always puts descriptor wrapper functions
in their own section. This lets the linker GC them. That is convenient
since we must generate a wrapper for every top-level exported function,
although most of them will never be used. We can only know whether they
are used or not at link time. Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu. Committed to mainline and 4.8 branch.
diff -r bc1ad842d946 go/gogo.cc
--- a/go/gogo.cc Wed Jul 24 15:24:12 2013 -0700
+++ b/go/gogo.cc Fri Aug 02 09:58:44 2013 -0700
@@ -3582,6 +3582,12 @@
Named_object* dno = gogo->start_function(name, new_fntype, false, loc);
dno->func_value()->is_descriptor_wrapper_ = true;
+ // Put the wrapper in a unique section so that it can be discarded
+ // by the linker if it is not needed. Every top-level function will
+ // get a wrapper, in case there is a reference other than a call
+ // from some other package, but most will not need one.
Expression* fn = Expression::make_func_reference(no, NULL, loc);