ART: Rework Generic JNI, add ARM version
Refactors and optimizes Generic JNI. This version uses TwoWordReturn
to avoid writing to / loading from the bottom of the alloca.
Change-Id: I3287007c976f79c9fd32d3b3a43f2d1371bf4cd3
diff --git a/runtime/utils.h b/runtime/utils.h
index 68ea475..eb79968 100644
--- a/runtime/utils.h
+++ b/runtime/utils.h
@@ -203,6 +203,19 @@
return (ch < ' ' || ch > '~');
}
+// Interpret the bit pattern of input (type U) as type V. Requires the size
+// of V >= size of U (compile-time checked).
+template<typename U, typename V>
+static inline V bit_cast(U in) {
+ COMPILE_ASSERT(sizeof(U) <= sizeof(V), size_of_u_not_le_size_of_v);
+ union {
+ U u;
+ V v;
+ } tmp;
+ tmp.u = in;
+ return tmp.v;
+}
+
std::string PrintableChar(uint16_t ch);
// Returns an ASCII string corresponding to the given UTF-8 string.