Generate not-null assertions on method parameters

Intrinsics.checkParameterIsNotNull() gets its caller's class and method names
from the stack trace to render them in an exception message.

Fix codegen tests because now it's now allowed to pass null to non-null
argument in tests

compiler/backend/src/org/jetbrains/jet/codegen/AsmUtil.java

@@ -422,6 +422,31 @@ public class AsmUtil {
         genMethodThrow(mv, STUB_EXCEPTION, STUB_EXCEPTION_MESSAGE);
     }
 
+    public static void genNotNullAssertionsForParameters(
+            @NotNull InstructionAdapter v,
+            @NotNull GenerationState state,
+            @NotNull FunctionDescriptor descriptor,
+            @NotNull FrameMap frameMap
+    ) {
+        if (!state.isGenerateNotNullParamAssertions()) return;
+
+        // Private method is not accessible from other classes, no assertions needed
+        if (getVisibilityAccessFlag(descriptor) == ACC_PRIVATE) return;
+
+        for (ValueParameterDescriptor parameter : descriptor.getValueParameters()) {
+            JetType type = parameter.getReturnType();
+            if (type == null || type.isNullable()) continue;
+
+            int index = frameMap.getIndex(parameter);
+            Type asmType = state.getTypeMapper().mapReturnType(type);
+            if (asmType.getSort() == Type.OBJECT || asmType.getSort() == Type.ARRAY) {
+                v.load(index, asmType);
+                v.visitLdcInsn(descriptor.getName().getName());
+                v.invokestatic("jet/runtime/Intrinsics", "checkParameterIsNotNull", "(Ljava/lang/Object;Ljava/lang/String;)V");
+            }
+        }
+    }
+
     public static void genNotNullAssertionForField(
             @NotNull InstructionAdapter v,
             @NotNull GenerationState state,

compiler/backend/src/org/jetbrains/jet/codegen/FunctionCodegen.java

@@ -211,6 +211,8 @@ public class FunctionCodegen extends GenerationStateAware {
 
             createSharedVarsForParameters(mv, functionDescriptor, frameMap, localVariablesInfo);
 
+            genNotNullAssertionsForParameters(new InstructionAdapter(mv), state, functionDescriptor, frameMap);
+
             ExpressionCodegen codegen = new ExpressionCodegen(mv, frameMap, asmMethod.getReturnType(), context, state);
             codegen.returnExpression(fun.getBodyExpression());