rta: add live_callsites and live_callsites

In a callgraph it is useful to be able to compute the live target of any
callsite

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/src/rapid_type_analysis.nit b/src/rapid_type_analysis.nit
index ff72fac..978fab4 100644 (file)
--- a/src/rapid_type_analysis.nit
+++ b/src/rapid_type_analysis.nit
@@ -31,6 +31,8 @@ import auto_super_init
 import csv # for live_types_to_csv
 import ordered_tree # for live_methods_to_tree
 
+private import more_collections
+
 redef class ModelBuilder
        fun do_rapid_type_analysis(mainmodule: MModule): RapidTypeAnalysis
        do
@@ -75,6 +77,36 @@ class RapidTypeAnalysis
        # Live methods.
        var live_methods = new HashSet[MMethod]
 
+       # Live callsites.
+       var live_callsites = new HashSet[CallSite]
+
+       private var live_targets_cache = new HashMap2[MType, MProperty, Set[MMethodDef]]
+
+       # The live targets of a specific callsite.
+       fun live_targets(callsite: CallSite): Set[MMethodDef]
+       do
+               var mtype = callsite.recv
+               var anchor = callsite.anchor
+               if anchor != null then mtype = mtype.anchor_to(callsite.mmodule, anchor)
+               if mtype isa MNullableType then mtype = mtype.mtype
+               assert mtype isa MClassType
+               mtype = mtype.mclass.intro.bound_mtype
+               var mproperty = callsite.mproperty
+               var res = live_targets_cache[mtype, mproperty]
+               if res != null then return res
+               res = new ArraySet[MMethodDef]
+               live_targets_cache[mtype, mproperty] = res
+
+               for c in live_classes do
+                       var tc = c.intro.bound_mtype
+                       if not tc.is_subtype(mainmodule, null, mtype) then continue
+                       var d = mproperty.lookup_first_definition(mainmodule, tc)
+                       res.add d
+               end
+
+               return res
+       end
+
        # Live call-to-super.
        var live_super_sends = new HashSet[MMethodDef]
 
@@ -442,7 +474,10 @@ class RapidTypeVisitor
 
        fun add_cast_type(mtype: MType) do analysis.add_cast(mtype)
 
-       fun add_callsite(callsite: nullable CallSite) do if callsite != null then analysis.add_send(callsite.recv, callsite.mproperty)
+       fun add_callsite(callsite: nullable CallSite) do if callsite != null then
+               analysis.add_send(callsite.recv, callsite.mproperty)
+               analysis.live_callsites.add(callsite)
+       end
 end
 
 ###