1 files changed, 16 insertions, 5 deletions
diff --git a/compiler/optimizing/optimization.h b/compiler/optimizing/optimization.h
index b00d686e5f..88b283cebf 100644
--- a/compiler/optimizing/optimization.h
+++ b/compiler/optimizing/optimization.h
@@ -102,21 +102,32 @@ enum class OptimizationPass {
 #if defined(ART_ENABLE_CODEGEN_x86) || defined(ART_ENABLE_CODEGEN_x86_64)
   kX86MemoryOperandGeneration,
 #endif
+  kNone,
+  kLast = kNone
 };
 
 // Lookup name of optimization pass.
 const char* OptimizationPassName(OptimizationPass pass);
 
 // Lookup optimization pass by name.
-OptimizationPass OptimizationPassByName(const std::string& name);
+OptimizationPass OptimizationPassByName(const std::string& pass_name);
 
 // Optimization definition consisting of an optimization pass
-// and an optional alternative name (nullptr denotes default).
-typedef std::pair<OptimizationPass, const char*> OptimizationDef;
+// an optional alternative name (nullptr denotes default), and
+// an optional pass dependence (kNone denotes no dependence).
+struct OptimizationDef {
+  OptimizationDef(OptimizationPass p, const char* pn, OptimizationPass d)
+      : pass(p), pass_name(pn), depends_on(d) {}
+  OptimizationPass pass;
+  const char* pass_name;
+  OptimizationPass depends_on;
+};
 
 // Helper method for optimization definition array entries.
-inline OptimizationDef OptDef(OptimizationPass pass, const char* name = nullptr) {
-  return std::make_pair(pass, name);
+inline OptimizationDef OptDef(OptimizationPass pass,
+                              const char* pass_name = nullptr,
+                              OptimizationPass depends_on = OptimizationPass::kNone) {
+  return OptimizationDef(pass, pass_name, depends_on);
 }
 
 // Helper method to construct series of optimization passes.