shader_ir: Add basic goto elimination
This commit is contained in:
Fernando Sahmkow
FernandoS27
parent
c17953978b
commit
4fde66e609
@ -11,6 +11,147 @@
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namespace VideoCommon::Shader {
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ASTZipper::ASTZipper() = default;
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ASTZipper::ASTZipper(ASTNode new_first) : first{}, last{} {
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first = new_first;
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last = new_first;
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ASTNode current = first;
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while (current) {
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current->manager = this;
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last = current;
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current = current->next;
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}
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}
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void ASTZipper::PushBack(ASTNode new_node) {
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new_node->previous = last;
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if (last) {
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last->next = new_node;
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}
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new_node->next.reset();
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last = new_node;
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if (!first) {
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first = new_node;
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}
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new_node->manager = this;
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}
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void ASTZipper::PushFront(ASTNode new_node) {
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new_node->previous.reset();
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new_node->next = first;
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if (first) {
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first->previous = first;
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}
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first = new_node;
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if (!last) {
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last = new_node;
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}
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new_node->manager = this;
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}
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void ASTZipper::InsertAfter(ASTNode new_node, ASTNode at_node) {
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if (!at_node) {
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PushFront(new_node);
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return;
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}
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new_node->previous = at_node;
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if (at_node == last) {
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last = new_node;
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}
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new_node->next = at_node->next;
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at_node->next = new_node;
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new_node->manager = this;
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}
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void ASTZipper::SetParent(ASTNode new_parent) {
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ASTNode current = first;
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while (current) {
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current->parent = new_parent;
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current = current->next;
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}
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}
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void ASTZipper::DetachTail(ASTNode node) {
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ASSERT(node->manager == this);
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if (node == first) {
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first.reset();
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last.reset();
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return;
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}
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last = node->previous;
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node->previous.reset();
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}
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void ASTZipper::DetachSegment(ASTNode start, ASTNode end) {
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ASSERT(start->manager == this && end->manager == this);
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ASTNode prev = start->previous;
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ASTNode post = end->next;
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if (!prev) {
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first = post;
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} else {
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prev->next = post;
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}
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if (!post) {
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last = prev;
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} else {
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post->previous = prev;
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}
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start->previous.reset();
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end->next.reset();
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ASTNode current = start;
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bool found = false;
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while (current) {
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current->manager = nullptr;
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current->parent.reset();
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found |= current == end;
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current = current->next;
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}
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ASSERT(found);
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}
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void ASTZipper::DetachSingle(ASTNode node) {
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ASSERT(node->manager == this);
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ASTNode prev = node->previous;
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ASTNode post = node->next;
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node->previous.reset();
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node->next.reset();
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if (!prev) {
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first = post;
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} else {
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prev->next = post;
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}
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if (!post) {
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last = prev;
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} else {
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post->previous = prev;
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}
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node->manager = nullptr;
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node->parent.reset();
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}
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void ASTZipper::Remove(ASTNode node) {
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ASSERT(node->manager == this);
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ASTNode next = node->next;
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ASTNode previous = node->previous;
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if (previous) {
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previous->next = next;
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}
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if (next) {
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next->previous = previous;
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}
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node->parent.reset();
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node->manager = nullptr;
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if (node == last) {
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last = previous;
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}
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if (node == first) {
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first = next;
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}
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}
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class ExprPrinter final {
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public:
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ExprPrinter() = default;
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@ -72,32 +213,39 @@ public:
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void operator()(ASTProgram& ast) {
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scope++;
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inner += "program {\n";
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for (ASTNode& node : ast.nodes) {
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Visit(node);
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ASTNode current = ast.nodes.GetFirst();
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while (current) {
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Visit(current);
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current = current->GetNext();
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}
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inner += "}\n";
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scope--;
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}
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void operator()(ASTIf& ast) {
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void operator()(ASTIfThen& ast) {
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ExprPrinter expr_parser{};
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std::visit(expr_parser, *ast.condition);
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inner += Ident() + "if (" + expr_parser.GetResult() + ") {\n";
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scope++;
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for (auto& node : ast.then_nodes) {
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Visit(node);
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ASTNode current = ast.nodes.GetFirst();
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while (current) {
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Visit(current);
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current = current->GetNext();
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}
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scope--;
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if (ast.else_nodes.size() > 0) {
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inner += Ident() + "} else {\n";
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scope++;
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for (auto& node : ast.else_nodes) {
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Visit(node);
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}
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scope--;
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} else {
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inner += Ident() + "}\n";
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inner += Ident() + "}\n";
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}
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void operator()(ASTIfElse& ast) {
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inner += Ident() + "else {\n";
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scope++;
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ASTNode current = ast.nodes.GetFirst();
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while (current) {
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Visit(current);
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current = current->GetNext();
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}
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scope--;
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inner += Ident() + "}\n";
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}
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void operator()(ASTBlockEncoded& ast) {
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@ -128,8 +276,10 @@ public:
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std::visit(expr_parser, *ast.condition);
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inner += Ident() + "do {\n";
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scope++;
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for (auto& node : ast.loop_nodes) {
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Visit(node);
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ASTNode current = ast.nodes.GetFirst();
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while (current) {
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Visit(current);
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current = current->GetNext();
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}
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scope--;
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inner += Ident() + "} while (" + expr_parser.GetResult() + ")\n";
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@ -142,6 +292,12 @@ public:
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(ast.kills ? "discard" : "exit") + ";\n";
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}
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void operator()(ASTBreak& ast) {
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ExprPrinter expr_parser{};
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std::visit(expr_parser, *ast.condition);
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inner += Ident() + "(" + expr_parser.GetResult() + ") -> break;\n";
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}
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std::string& Ident() {
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if (memo_scope == scope) {
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return tabs_memo;
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@ -177,4 +333,164 @@ std::string ASTManager::Print() {
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return printer.GetResult();
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}
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#pragma optimize("", off)
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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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ASTNode goto_node = *it;
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u32 label_index = goto_node->GetGotoLabel();
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ASTNode label = labels[label_index];
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if (IndirectlyRelated(goto_node, label)) {
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while (!DirectlyRelated(goto_node, label)) {
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MoveOutward(goto_node);
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}
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}
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if (DirectlyRelated(goto_node, label)) {
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u32 goto_level = goto_node->GetLevel();
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u32 label_level = goto_node->GetLevel();
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while (label_level > goto_level) {
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MoveOutward(goto_node);
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goto_level++;
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}
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}
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if (label->GetParent() == goto_node->GetParent()) {
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bool is_loop = false;
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ASTNode current = goto_node->GetPrevious();
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while (current) {
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if (current == label) {
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is_loop = true;
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break;
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}
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current = current->GetPrevious();
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}
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if (is_loop) {
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EncloseDoWhile(goto_node, label);
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} else {
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EncloseIfThen(goto_node, label);
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}
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it = gotos.erase(it);
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continue;
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}
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it++;
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}
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/*
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for (ASTNode label : labels) {
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auto& manager = label->GetManager();
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manager.Remove(label);
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}
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labels.clear();
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*/
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}
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bool ASTManager::IndirectlyRelated(ASTNode first, ASTNode second) {
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return !(first->GetParent() == second->GetParent() || DirectlyRelated(first, second));
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}
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bool ASTManager::DirectlyRelated(ASTNode first, ASTNode second) {
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if (first->GetParent() == second->GetParent()) {
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return false;
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}
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u32 first_level = first->GetLevel();
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u32 second_level = second->GetLevel();
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u32 min_level;
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u32 max_level;
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ASTNode max;
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ASTNode min;
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if (first_level > second_level) {
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min_level = second_level;
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min = second;
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max_level = first_level;
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max = first;
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} else {
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min_level = first_level;
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min = first;
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max_level = second_level;
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max = second;
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}
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while (min_level < max_level) {
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min_level++;
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min = min->GetParent();
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}
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return (min->GetParent() == max->GetParent());
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}
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void ASTManager::EncloseDoWhile(ASTNode goto_node, ASTNode label) {
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ASTZipper& zipper = goto_node->GetManager();
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ASTNode loop_start = label->GetNext();
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if (loop_start == goto_node) {
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zipper.Remove(goto_node);
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return;
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}
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ASTNode parent = label->GetParent();
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Expr condition = goto_node->GetGotoCondition();
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zipper.DetachSegment(loop_start, goto_node);
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ASTNode do_while_node = ASTBase::Make<ASTDoWhile>(parent, condition, ASTZipper(loop_start));
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zipper.InsertAfter(do_while_node, label);
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ASTZipper* sub_zipper = do_while_node->GetSubNodes();
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sub_zipper->SetParent(do_while_node);
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sub_zipper->Remove(goto_node);
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}
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void ASTManager::EncloseIfThen(ASTNode goto_node, ASTNode label) {
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ASTZipper& zipper = goto_node->GetManager();
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ASTNode if_end = label->GetPrevious();
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if (if_end == goto_node) {
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zipper.Remove(goto_node);
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return;
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}
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ASTNode prev = goto_node->GetPrevious();
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ASTNode parent = label->GetParent();
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Expr condition = goto_node->GetGotoCondition();
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Expr neg_condition = MakeExpr<ExprNot>(condition);
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zipper.DetachSegment(goto_node, if_end);
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ASTNode if_node = ASTBase::Make<ASTIfThen>(parent, condition, ASTZipper(goto_node));
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zipper.InsertAfter(if_node, prev);
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ASTZipper* sub_zipper = if_node->GetSubNodes();
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sub_zipper->SetParent(if_node);
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sub_zipper->Remove(goto_node);
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}
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void ASTManager::MoveOutward(ASTNode goto_node) {
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ASTZipper& zipper = goto_node->GetManager();
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ASTNode parent = goto_node->GetParent();
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bool is_loop = parent->IsLoop();
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bool is_if = parent->IsIfThen() || parent->IsIfElse();
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ASTNode prev = goto_node->GetPrevious();
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Expr condition = goto_node->GetGotoCondition();
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u32 var_index = NewVariable();
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Expr var_condition = MakeExpr<ExprVar>(var_index);
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ASTNode var_node = ASTBase::Make<ASTVarSet>(parent, var_index, condition);
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zipper.DetachSingle(goto_node);
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zipper.InsertAfter(var_node, prev);
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goto_node->SetGotoCondition(var_condition);
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if (is_loop) {
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ASTNode break_node = ASTBase::Make<ASTBreak>(parent, var_condition);
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zipper.InsertAfter(break_node, var_node);
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} else if (is_if) {
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ASTNode post = var_node->GetNext();
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if (post) {
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zipper.DetachTail(post);
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ASTNode if_node = ASTBase::Make<ASTIfThen>(parent, var_condition, ASTZipper(post));
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zipper.InsertAfter(if_node, var_node);
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ASTZipper* sub_zipper = if_node->GetSubNodes();
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sub_zipper->SetParent(if_node);
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}
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} else {
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UNREACHABLE();
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}
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ASTZipper& zipper2 = parent->GetManager();
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ASTNode next = parent->GetNext();
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if (is_if && next && next->IsIfElse()) {
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zipper2.InsertAfter(goto_node, next);
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return;
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}
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zipper2.InsertAfter(goto_node, parent);
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}
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} // namespace VideoCommon::Shader
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@ -18,32 +18,71 @@ namespace VideoCommon::Shader {
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class ASTBase;
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class ASTProgram;
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class ASTIf;
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class ASTIfThen;
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class ASTIfElse;
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class ASTBlockEncoded;
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class ASTVarSet;
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class ASTGoto;
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class ASTLabel;
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class ASTDoWhile;
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class ASTReturn;
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class ASTBreak;
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using ASTData = std::variant<ASTProgram, ASTIf, ASTBlockEncoded, ASTVarSet, ASTGoto, ASTLabel,
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ASTDoWhile, ASTReturn>;
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using ASTData = std::variant<ASTProgram, ASTIfThen, ASTIfElse, ASTBlockEncoded, ASTVarSet, ASTGoto,
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ASTLabel, ASTDoWhile, ASTReturn, ASTBreak>;
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using ASTNode = std::shared_ptr<ASTBase>;
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class ASTProgram {
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public:
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ASTProgram() = default;
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std::list<ASTNode> nodes;
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enum class ASTZipperType : u32 {
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Program,
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IfThen,
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IfElse,
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Loop,
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};
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class ASTIf {
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class ASTZipper final {
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public:
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ASTIf(Expr condition, std::list<ASTNode> then_nodes, std::list<ASTNode> else_nodes)
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: condition(condition), then_nodes{then_nodes}, else_nodes{then_nodes} {}
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ASTZipper();
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ASTZipper(ASTNode first);
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ASTNode GetFirst() {
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return first;
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}
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ASTNode GetLast() {
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return last;
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}
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void PushBack(ASTNode new_node);
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void PushFront(ASTNode new_node);
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void InsertAfter(ASTNode new_node, ASTNode at_node);
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void SetParent(ASTNode new_parent);
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void DetachTail(ASTNode node);
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void DetachSingle(ASTNode node);
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void DetachSegment(ASTNode start, ASTNode end);
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void Remove(ASTNode node);
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ASTNode first{};
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ASTNode last{};
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};
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class ASTProgram {
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public:
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ASTProgram() : nodes{} {};
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ASTZipper nodes;
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};
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class ASTIfThen {
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public:
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ASTIfThen(Expr condition, ASTZipper nodes) : condition(condition), nodes{nodes} {}
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Expr condition;
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std::list<ASTNode> then_nodes;
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std::list<ASTNode> else_nodes;
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ASTZipper nodes;
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};
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class ASTIfElse {
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public:
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ASTIfElse(ASTZipper nodes) : nodes{nodes} {}
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ASTZipper nodes;
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};
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class ASTBlockEncoded {
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@ -75,10 +114,9 @@ public:
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class ASTDoWhile {
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public:
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ASTDoWhile(Expr condition, std::list<ASTNode> loop_nodes)
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: condition(condition), loop_nodes{loop_nodes} {}
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ASTDoWhile(Expr condition, ASTZipper nodes) : condition(condition), nodes{nodes} {}
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Expr condition;
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std::list<ASTNode> loop_nodes;
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ASTZipper nodes;
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};
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class ASTReturn {
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@ -88,6 +126,12 @@ public:
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bool kills;
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};
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class ASTBreak {
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public:
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ASTBreak(Expr condition) : condition{condition} {}
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Expr condition;
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};
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class ASTBase {
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public:
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explicit ASTBase(ASTNode parent, ASTData data) : parent{parent}, data{data} {}
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@ -111,9 +155,9 @@ public:
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u32 GetLevel() const {
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u32 level = 0;
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auto next = parent;
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while (next) {
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next = next->GetParent();
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auto next_parent = parent;
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while (next_parent) {
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next_parent = next_parent->GetParent();
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level++;
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}
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return level;
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@ -123,15 +167,83 @@ public:
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return &data;
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}
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ASTNode GetNext() {
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return next;
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}
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ASTNode GetPrevious() {
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return previous;
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}
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||||
|
||||
ASTZipper& GetManager() {
|
||||
return *manager;
|
||||
}
|
||||
|
||||
u32 GetGotoLabel() const {
|
||||
auto inner = std::get_if<ASTGoto>(&data);
|
||||
if (inner) {
|
||||
return inner->label;
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
|
||||
Expr GetGotoCondition() const {
|
||||
auto inner = std::get_if<ASTGoto>(&data);
|
||||
if (inner) {
|
||||
return inner->condition;
|
||||
}
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
void SetGotoCondition(Expr new_condition) {
|
||||
auto inner = std::get_if<ASTGoto>(&data);
|
||||
if (inner) {
|
||||
inner->condition = new_condition;
|
||||
}
|
||||
}
|
||||
|
||||
bool IsIfThen() const {
|
||||
return std::holds_alternative<ASTIfThen>(data);
|
||||
}
|
||||
|
||||
bool IsIfElse() const {
|
||||
return std::holds_alternative<ASTIfElse>(data);
|
||||
}
|
||||
|
||||
bool IsLoop() const {
|
||||
return std::holds_alternative<ASTDoWhile>(data);
|
||||
}
|
||||
|
||||
ASTZipper* GetSubNodes() {
|
||||
if (std::holds_alternative<ASTProgram>(data)) {
|
||||
return &std::get_if<ASTProgram>(&data)->nodes;
|
||||
}
|
||||
if (std::holds_alternative<ASTIfThen>(data)) {
|
||||
return &std::get_if<ASTIfThen>(&data)->nodes;
|
||||
}
|
||||
if (std::holds_alternative<ASTIfElse>(data)) {
|
||||
return &std::get_if<ASTIfElse>(&data)->nodes;
|
||||
}
|
||||
if (std::holds_alternative<ASTDoWhile>(data)) {
|
||||
return &std::get_if<ASTDoWhile>(&data)->nodes;
|
||||
}
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
private:
|
||||
friend class ASTZipper;
|
||||
|
||||
ASTData data;
|
||||
ASTNode parent;
|
||||
ASTNode next{};
|
||||
ASTNode previous{};
|
||||
ASTZipper* manager{};
|
||||
};
|
||||
|
||||
class ASTManager final {
|
||||
public:
|
||||
explicit ASTManager() {
|
||||
main_node = ASTBase::Make<ASTProgram>(nullptr);
|
||||
main_node = ASTBase::Make<ASTProgram>(ASTNode{});
|
||||
program = std::get_if<ASTProgram>(main_node->GetInnerData());
|
||||
}
|
||||
|
||||
@ -147,31 +259,49 @@ public:
|
||||
u32 index = labels_map[address];
|
||||
ASTNode label = ASTBase::Make<ASTLabel>(main_node, index);
|
||||
labels[index] = label;
|
||||
program->nodes.push_back(label);
|
||||
program->nodes.PushBack(label);
|
||||
}
|
||||
|
||||
void InsertGoto(Expr condition, u32 address) {
|
||||
u32 index = labels_map[address];
|
||||
ASTNode goto_node = ASTBase::Make<ASTGoto>(main_node, condition, index);
|
||||
gotos.push_back(goto_node);
|
||||
program->nodes.push_back(goto_node);
|
||||
program->nodes.PushBack(goto_node);
|
||||
}
|
||||
|
||||
void InsertBlock(u32 start_address, u32 end_address) {
|
||||
ASTNode block = ASTBase::Make<ASTBlockEncoded>(main_node, start_address, end_address);
|
||||
program->nodes.push_back(block);
|
||||
program->nodes.PushBack(block);
|
||||
}
|
||||
|
||||
void InsertReturn(Expr condition, bool kills) {
|
||||
ASTNode node = ASTBase::Make<ASTReturn>(main_node, condition, kills);
|
||||
program->nodes.push_back(node);
|
||||
program->nodes.PushBack(node);
|
||||
}
|
||||
|
||||
std::string Print();
|
||||
|
||||
void Decompile() {}
|
||||
void Decompile();
|
||||
|
||||
|
||||
|
||||
private:
|
||||
bool IndirectlyRelated(ASTNode first, ASTNode second);
|
||||
|
||||
bool DirectlyRelated(ASTNode first, ASTNode second);
|
||||
|
||||
void EncloseDoWhile(ASTNode goto_node, ASTNode label);
|
||||
|
||||
void EncloseIfThen(ASTNode goto_node, ASTNode label);
|
||||
|
||||
void MoveOutward(ASTNode goto_node) ;
|
||||
|
||||
u32 NewVariable() {
|
||||
u32 new_var = variables;
|
||||
variables++;
|
||||
return new_var;
|
||||
}
|
||||
|
||||
std::unordered_map<u32, u32> labels_map{};
|
||||
u32 labels_count{};
|
||||
std::vector<ASTNode> labels{};
|
||||
|
||||
Loading…
Reference in New Issue
Block a user