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Shader_IR: clean up AST handling and add documentation.
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@ -432,6 +432,12 @@ void ASTManager::InsertReturn(Expr condition, bool kills) {
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program->nodes.PushBack(node);
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}
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// The decompile algorithm is based on
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// "Taming control flow: A structured approach to eliminating goto statements"
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// by AM Erosa, LJ Hendren 1994. In general, the idea is to get gotos to be
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// on the same structured level as the label which they jump to. This is done,
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// through outward/inward movements and lifting. Once they are at the same
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// level, you can enclose them in an "if" structure or a "do-while" structure.
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void ASTManager::Decompile() {
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auto it = gotos.begin();
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while (it != gotos.end()) {
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@ -656,11 +662,9 @@ void ASTManager::EncloseIfThen(ASTNode goto_node, ASTNode label) {
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sub_zipper->Init(goto_node, if_node);
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zipper.InsertAfter(if_node, prev);
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sub_zipper->Remove(goto_node);
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// ShowCurrentState("After IfThen Enclose");
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}
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void ASTManager::MoveOutward(ASTNode goto_node) {
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// ShowCurrentState("Before MoveOutward");
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ASTZipper& zipper = goto_node->GetManager();
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const ASTNode parent = goto_node->GetParent();
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ASTZipper& zipper2 = parent->GetManager();
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