glasm: Rework control flow introducing a syntax list

This commit regresses VertexA shaders, their transformation pass has to
be adapted to the new control flow.

1 files changed, 56 insertions, 0 deletions

diff --git a/src/shader_recompiler/frontend/ir/abstract_syntax_list.h b/src/shader_recompiler/frontend/ir/abstract_syntax_list.h
new file mode 100644
index 000000000..1366414c2
--- /dev/null
+++ b/src/shader_recompiler/frontend/ir/abstract_syntax_list.h
@@ -0,0 +1,56 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <vector>
+
+#include "shader_recompiler/frontend/ir/value.h"
+
+namespace Shader::IR {
+
+class Block;
+
+struct AbstractSyntaxNode {
+    enum class Type {
+        Block,
+        If,
+        EndIf,
+        Loop,
+        Repeat,
+        Break,
+        Return,
+        Unreachable,
+    };
+    Type type{};
+    union {
+        Block* block{};
+        struct {
+            U1 cond;
+            Block* body;
+            Block* merge;
+        } if_node;
+        struct {
+            Block* merge;
+        } end_if;
+        struct {
+            Block* body;
+            Block* continue_block;
+            Block* merge;
+        } loop;
+        struct {
+            U1 cond;
+            Block* loop_header;
+            Block* merge;
+        } repeat;
+        struct {
+            U1 cond;
+            Block* merge;
+            Block* skip;
+        } break_node;
+    };
+};
+using AbstractSyntaxList = std::vector<AbstractSyntaxNode>;
+
+} // namespace Shader::IR