From 97825750a3b281e265039d0eff4be144bc56230e Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Wed, 31 Oct 2018 03:37:36 -0300
Subject: [PATCH] Add OpAccessChain

---
 include/sirit/sirit.h |  5 +++++
 src/insts/memory.cpp  | 10 ++++++++++
 2 files changed, 15 insertions(+)

diff --git a/include/sirit/sirit.h b/include/sirit/sirit.h
index 8ddf9b5..b54699f 100644
--- a/include/sirit/sirit.h
+++ b/include/sirit/sirit.h
@@ -200,6 +200,11 @@ class Module {
     Ref Variable(Ref result_type, spv::StorageClass storage_class,
                  Ref initializer = nullptr);
 
+    /// Create a pointer into a composite object that can be used with OpLoad
+    /// and OpStore.
+    Ref AccessChain(Ref result_type, Ref base,
+                    const std::vector<Ref>& indexes = {});
+
     // Annotation
 
     /// Add a decoration to target.
diff --git a/src/insts/memory.cpp b/src/insts/memory.cpp
index 502f949..b3e55b8 100644
--- a/src/insts/memory.cpp
+++ b/src/insts/memory.cpp
@@ -6,6 +6,7 @@
 
 #include "insts.h"
 #include "sirit/sirit.h"
+#include <cassert>
 
 namespace Sirit {
 
@@ -19,4 +20,13 @@ Ref Module::Variable(Ref result_type, spv::StorageClass storage_class,
     return AddCode(op);
 }
 
+Ref Module::AccessChain(Ref result_type, Ref base,
+                        const std::vector<Ref>& indexes) {
+    assert(indexes.size() > 0);
+    auto op{new Op(spv::Op::OpAccessChain, bound++, result_type)};
+    op->Add(base);
+    op->Add(indexes);
+    return AddCode(op);
+}
+
 } // namespace Sirit