Convert some ObjC msgSends to runtime calls.
It is faster to directly call the ObjC runtime for methods such as retain/release instead of sending a message to those functions.
This patch adds support for converting messages to retain/release/alloc/autorelease to their equivalent runtime calls.
Tests included for the positive case of applying this transformation, negative tests that we ensure we only convert "alloc" to objc_alloc, not "alloc2", and also a driver test to ensure we enable this only for supported runtime versions.
Reviewed by John McCall.
Differential Revision: http://reviews.llvm.org/D14737
llvm-svn: 263607
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index cb39871..2849d51 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -5284,6 +5284,18 @@
}
+ // Allow the user to control whether messages can be converted to runtime
+ // functions.
+ if (types::isObjC(InputType)) {
+ auto *Arg = Args.getLastArg(
+ options::OPT_fobjc_convert_messages_to_runtime_calls,
+ options::OPT_fno_objc_convert_messages_to_runtime_calls);
+ if (Arg &&
+ Arg->getOption().matches(
+ options::OPT_fno_objc_convert_messages_to_runtime_calls))
+ CmdArgs.push_back("-fno-objc-convert-messages-to-runtime-calls");
+ }
+
// -fobjc-infer-related-result-type is the default, except in the Objective-C
// rewriter.
if (rewriteKind != RK_None)