Subzero: Initial implementation of multithreaded translation.

src/IceDefs.h

Index: src/IceDefs.h
diff --git a/src/IceDefs.h b/src/IceDefs.h
index 66a500fe950f46a312caa41b1a8d84b4fe2dad36..2d2fdac663378e9c11713508c2f8ba7ae690b741 100644
--- a/src/IceDefs.h
+++ b/src/IceDefs.h
@@ -23,6 +23,7 @@
 #include <limits>
 #include <list>
 #include <map>
+#include <mutex>
 #include <string>
 #include <vector>
 #include "llvm/ADT/ArrayRef.h"
@@ -65,6 +66,7 @@ class InstTarget;
 class LiveRange;
 class Liveness;
 class Operand;
+class TargetGlobalLowering;
 class TargetLowering;
 class Variable;
 class VariableDeclaration;
@@ -127,6 +129,13 @@ typedef llvm::BitVector LivenessBV;
 typedef uint32_t TimerStackIdT;
 typedef uint32_t TimerIdT;
 
+// Use alignas(MaxCacheLineSize) to isolate variables/fields that
+// might be contended while multithreading.  Assumes the maximum cache
+// line size is 64.
+enum {
+  MaxCacheLineSize = 64
+};
+
 // PNaCl is ILP32, so theoretically we should only need 32-bit offsets.
 typedef int32_t RelocOffsetT;
 enum { RelocAddrSize = 4 };
@@ -170,6 +179,8 @@ typedef uint32_t VerboseMask;
 typedef llvm::raw_ostream Ostream;
 typedef llvm::raw_fd_ostream Fdstream;
 
+typedef std::mutex GlobalLockType;
+
 // Reverse range adaptors written in terms of llvm::make_range().
 template <typename T>
 llvm::iterator_range<typename T::const_reverse_iterator>