From df6eeb93c1718334779ae328db277cdf7a9d7b04 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Fri, 12 Jan 2018 14:15:56 -0800
Subject: Refactor substitution representation in DeclRefBase (#363)

This commit changes the type of `DeclRefBase::substitutions` from `RefPtr<Substitutions>` to `SubstitutionSet`, which is a new type defined as following:
```
struct SubstitutionSet
{
    RefPtr<GenericSubstitution> genericSubstitutions;
    RefPtr<ThisTypeSubstitution> thisTypeSubstitution;
    RefPtr<GlobalGenericParamSubstitution> globalGenParamSubstitutions;
}
```
This change get rid of most helper functions to retreive the substitution of a certain type, as well as surgery operations to insert a `ThisTypeSubstitution` or `GlobalGenericTypeSubstittuion` at top or bottom of the substitution chain. It also simplies type comparison when certain type of substitution should not be considered as part of type definition.
---
 source/slang/emit.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'source/slang/emit.cpp')

diff --git a/source/slang/emit.cpp b/source/slang/emit.cpp
index e60941e50..41ae819d9 100644
--- a/source/slang/emit.cpp
+++ b/source/slang/emit.cpp
@@ -3054,7 +3054,7 @@ struct EmitVisitor
                 return;
             }
 
-            GenericSubstitution* subst = declRef.substitutions.As<GenericSubstitution>().Ptr();
+            GenericSubstitution* subst = declRef.substitutions.genericSubstitutions;
             if (!subst)
                 return;
 
-- 
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