From ec8175c1f0afe3f7758f70da240aba03a791c3a9 Mon Sep 17 00:00:00 2001
From: Tim Foley <tfoley@nvidia.com>
Date: Thu, 17 Aug 2017 14:51:09 -0700
Subject: [ir] Add support for "decorations" on instructions

The terminology here is similar to SPIR-V. For right now the only decoration exposed is a fairly brute-force one that just points back to a high-level declaration so that we can look up info on it that might affect how we print output.
---
 source/slang/ir.cpp | 38 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 2 deletions(-)

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

diff --git a/source/slang/ir.cpp b/source/slang/ir.cpp
index b6af6aabb..8e4f789ef 100644
--- a/source/slang/ir.cpp
+++ b/source/slang/ir.cpp
@@ -46,6 +46,16 @@ namespace Slang
         return &type;
     }
 
+    IRDecoration* IRInst::findDecorationImpl(IRDecorationOp decorationOp)
+    {
+        for( auto dd = firstDecoration; dd; dd = dd->next )
+        {
+            if(dd->op == decorationOp)
+                return dd;
+        }
+        return nullptr;
+    }
+
     //
 
     IRParam* IRFunc::getFirstParam()
@@ -129,8 +139,6 @@ namespace Slang
         IRValue* inst = (IRInst*) malloc(size);
         memset(inst, 0, size);
 
-        IRUse* instArgs = inst->getArgs();
-
         auto module = builder->getModule();
         if (!module || (type && type->op == kIROp_VoidType))
         {
@@ -793,6 +801,32 @@ namespace Slang
         return inst;
     }
 
+    IRDecoration* IRBuilder::addDecorationImpl(
+        IRInst*         inst,
+        UInt            decorationSize,
+        IRDecorationOp  op)
+    {
+        auto decoration = (IRDecoration*) malloc(decorationSize);
+        memset(decoration, 0, decorationSize);
+
+        decoration->op = op;
+
+        decoration->next = inst->firstDecoration;
+        inst->firstDecoration = decoration;
+
+        return decoration;
+    }
+
+    IRHighLevelDeclDecoration* IRBuilder::addHighLevelDeclDecoration(IRInst* inst, Decl* decl)
+    {
+        auto decoration = addDecoration<IRHighLevelDeclDecoration>(inst, kIRDecorationOp_HighLevelDecl);
+        decoration->decl = decl;
+        return decoration;
+    }
+
+    //
+
+
     struct IRDumpContext
     {
         FILE*   file;
-- 
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