Allow dispatch to use a range of Class-ids in tests

runtime/vm/constants_dbc.h

Index: runtime/vm/constants_dbc.h
diff --git a/runtime/vm/constants_dbc.h b/runtime/vm/constants_dbc.h
index 49d2910932fec5d6db547d400bf1158cb8c9349a..37321516a84d839d1a3b695f2cd77a6e8d0ab16d 100644
--- a/runtime/vm/constants_dbc.h
+++ b/runtime/vm/constants_dbc.h
@@ -170,7 +170,17 @@ namespace dart {
 //    The function is looked up in the IC data encoded in the following 2*D
 //    Nop instructions. The Nop instructions should be arranged in pairs with
 //    the first being the cid, and the second being the function to push if
-//    the cid is the cid of the receiver found at SP[-(1 + ArgC)].
+//    the cid matches the cid in the pair.
+//
+//  - PushPolymorphic3InstanceCall ArgC, D

[Vyacheslav Egorov (Google), 2017/03/10 10:31:30]

Better call it 

PushPolymorphicInstanceCallByRange

(I think original instruction should have been called

PushPolymorphicInstanceCallTarget)

[erikcorry, 2017/03/10 13:30:01]

Done.

+//
+//    Skips 3*D + 1 instructions and pushes a function object onto the stack
+//    if one can be found as follows. Otherwise skips only 3*D instructions.
+//    The function is looked up in the IC data encoded in the following 3*D
+//    Nop instructions. The Nop instructions should be arranged in triples with
+//    the first being the start cid, the second being the number of cids, and
+//    the third being the function to push if the cid is in the range given
+//    by the first two Nop instructions.
 //
 //  - OneByteStringFromCharCode rA, rX
 //
@@ -590,6 +600,14 @@ namespace dart {
 //    rB == 1, or if FP[rA]'s cid is found in the array of cids encoded by the
 //    following rC Nop instructions. Otherwise skips only rC instructions.
 //
+//  - CheckCids2 rA, rB, rC

[Vyacheslav Egorov (Google), 2017/03/10 10:31:30]

Better call it CheckCidRanges

[erikcorry, 2017/03/10 13:30:01]

Done.

+//
+//    Skips rC + 1 instructions if the object at FP[rA] is a Smi and rB ==
+//    1, or if FP[rA]'s cid is found in the array of cid ranges encoded by the
+//    following rC Nop instructions. The cid ranges from a inclusive to b
+//    exclusive are coded in pairs of (a, b - a). Otherwise skips only 2
+//    instructions.
+//
 //  - CheckStack
 //
 //    Compare SP against isolate stack limit and call StackOverflow handler if
@@ -678,6 +696,7 @@ namespace dart {
   V(InstanceCall1Opt,              A_D, num, num, ___) \
   V(InstanceCall2Opt,              A_D, num, num, ___) \
   V(PushPolymorphicInstanceCall,   A_D, num, num, ___) \
+  V(PushPolymorphic3InstanceCall,  A_D, num, num, ___) \
   V(NativeCall,                      0, ___, ___, ___) \
   V(NativeBootstrapCall,             0, ___, ___, ___) \
   V(OneByteStringFromCharCode,     A_X, reg, xeg, ___) \
@@ -820,6 +839,7 @@ namespace dart {
   V(CheckClassId,                  A_D, reg, num, ___) \
   V(CheckDenseSwitch,              A_D, reg, num, ___) \
   V(CheckCids,                   A_B_C, reg, num, num) \
+  V(CheckCids2,                  A_B_C, reg, num, num) \
   V(CheckStack,                      0, ___, ___, ___) \
   V(CheckStackAlwaysExit,            0, ___, ___, ___) \
   V(DebugStep,                       0, ___, ___, ___) \