From c67d64365a712830fe140dd36e24e2efd9b8a812 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Tue, 16 Feb 2021 20:52:12 -0300
Subject: shader: Remove old shader management

---
 src/video_core/shader/ast.cpp | 752 ------------------------------------------
 1 file changed, 752 deletions(-)
 delete mode 100644 src/video_core/shader/ast.cpp

(limited to 'src/video_core/shader/ast.cpp')

diff --git a/src/video_core/shader/ast.cpp b/src/video_core/shader/ast.cpp
deleted file mode 100644
index db11144c7..000000000
--- a/src/video_core/shader/ast.cpp
+++ /dev/null
@@ -1,752 +0,0 @@
-// Copyright 2019 yuzu Emulator Project
-// Licensed under GPLv2 or any later version
-// Refer to the license.txt file included.
-
-#include <string>
-#include <string_view>
-
-#include <fmt/format.h>
-
-#include "common/assert.h"
-#include "common/common_types.h"
-#include "video_core/shader/ast.h"
-#include "video_core/shader/expr.h"
-
-namespace VideoCommon::Shader {
-
-ASTZipper::ASTZipper() = default;
-
-void ASTZipper::Init(const ASTNode new_first, const ASTNode parent) {
-    ASSERT(new_first->manager == nullptr);
-    first = new_first;
-    last = new_first;
-
-    ASTNode current = first;
-    while (current) {
-        current->manager = this;
-        current->parent = parent;
-        last = current;
-        current = current->next;
-    }
-}
-
-void ASTZipper::PushBack(const ASTNode new_node) {
-    ASSERT(new_node->manager == nullptr);
-    new_node->previous = last;
-    if (last) {
-        last->next = new_node;
-    }
-    new_node->next.reset();
-    last = new_node;
-    if (!first) {
-        first = new_node;
-    }
-    new_node->manager = this;
-}
-
-void ASTZipper::PushFront(const ASTNode new_node) {
-    ASSERT(new_node->manager == nullptr);
-    new_node->previous.reset();
-    new_node->next = first;
-    if (first) {
-        first->previous = new_node;
-    }
-    if (last == first) {
-        last = new_node;
-    }
-    first = new_node;
-    new_node->manager = this;
-}
-
-void ASTZipper::InsertAfter(const ASTNode new_node, const ASTNode at_node) {
-    ASSERT(new_node->manager == nullptr);
-    if (!at_node) {
-        PushFront(new_node);
-        return;
-    }
-    const ASTNode next = at_node->next;
-    if (next) {
-        next->previous = new_node;
-    }
-    new_node->previous = at_node;
-    if (at_node == last) {
-        last = new_node;
-    }
-    new_node->next = next;
-    at_node->next = new_node;
-    new_node->manager = this;
-}
-
-void ASTZipper::InsertBefore(const ASTNode new_node, const ASTNode at_node) {
-    ASSERT(new_node->manager == nullptr);
-    if (!at_node) {
-        PushBack(new_node);
-        return;
-    }
-    const ASTNode previous = at_node->previous;
-    if (previous) {
-        previous->next = new_node;
-    }
-    new_node->next = at_node;
-    if (at_node == first) {
-        first = new_node;
-    }
-    new_node->previous = previous;
-    at_node->previous = new_node;
-    new_node->manager = this;
-}
-
-void ASTZipper::DetachTail(ASTNode node) {
-    ASSERT(node->manager == this);
-    if (node == first) {
-        first.reset();
-        last.reset();
-        return;
-    }
-
-    last = node->previous;
-    last->next.reset();
-    node->previous.reset();
-
-    ASTNode current = std::move(node);
-    while (current) {
-        current->manager = nullptr;
-        current->parent.reset();
-        current = current->next;
-    }
-}
-
-void ASTZipper::DetachSegment(const ASTNode start, const ASTNode end) {
-    ASSERT(start->manager == this && end->manager == this);
-    if (start == end) {
-        DetachSingle(start);
-        return;
-    }
-    const ASTNode prev = start->previous;
-    const ASTNode post = end->next;
-    if (!prev) {
-        first = post;
-    } else {
-        prev->next = post;
-    }
-    if (!post) {
-        last = prev;
-    } else {
-        post->previous = prev;
-    }
-    start->previous.reset();
-    end->next.reset();
-    ASTNode current = start;
-    bool found = false;
-    while (current) {
-        current->manager = nullptr;
-        current->parent.reset();
-        found |= current == end;
-        current = current->next;
-    }
-    ASSERT(found);
-}
-
-void ASTZipper::DetachSingle(const ASTNode node) {
-    ASSERT(node->manager == this);
-    const ASTNode prev = node->previous;
-    const ASTNode post = node->next;
-    node->previous.reset();
-    node->next.reset();
-    if (!prev) {
-        first = post;
-    } else {
-        prev->next = post;
-    }
-    if (!post) {
-        last = prev;
-    } else {
-        post->previous = prev;
-    }
-
-    node->manager = nullptr;
-    node->parent.reset();
-}
-
-void ASTZipper::Remove(const ASTNode node) {
-    ASSERT(node->manager == this);
-    const ASTNode next = node->next;
-    const ASTNode previous = node->previous;
-    if (previous) {
-        previous->next = next;
-    }
-    if (next) {
-        next->previous = previous;
-    }
-    node->parent.reset();
-    node->manager = nullptr;
-    if (node == last) {
-        last = previous;
-    }
-    if (node == first) {
-        first = next;
-    }
-}
-
-class ExprPrinter final {
-public:
-    void operator()(const ExprAnd& expr) {
-        inner += "( ";
-        std::visit(*this, *expr.operand1);
-        inner += " && ";
-        std::visit(*this, *expr.operand2);
-        inner += ')';
-    }
-
-    void operator()(const ExprOr& expr) {
-        inner += "( ";
-        std::visit(*this, *expr.operand1);
-        inner += " || ";
-        std::visit(*this, *expr.operand2);
-        inner += ')';
-    }
-
-    void operator()(const ExprNot& expr) {
-        inner += "!";
-        std::visit(*this, *expr.operand1);
-    }
-
-    void operator()(const ExprPredicate& expr) {
-        inner += fmt::format("P{}", expr.predicate);
-    }
-
-    void operator()(const ExprCondCode& expr) {
-        inner += fmt::format("CC{}", expr.cc);
-    }
-
-    void operator()(const ExprVar& expr) {
-        inner += fmt::format("V{}", expr.var_index);
-    }
-
-    void operator()(const ExprBoolean& expr) {
-        inner += expr.value ? "true" : "false";
-    }
-
-    void operator()(const ExprGprEqual& expr) {
-        inner += fmt::format("(gpr_{} == {})", expr.gpr, expr.value);
-    }
-
-    const std::string& GetResult() const {
-        return inner;
-    }
-
-private:
-    std::string inner;
-};
-
-class ASTPrinter {
-public:
-    void operator()(const ASTProgram& ast) {
-        scope++;
-        inner += "program {\n";
-        ASTNode current = ast.nodes.GetFirst();
-        while (current) {
-            Visit(current);
-            current = current->GetNext();
-        }
-        inner += "}\n";
-        scope--;
-    }
-
-    void operator()(const ASTIfThen& ast) {
-        ExprPrinter expr_parser{};
-        std::visit(expr_parser, *ast.condition);
-        inner += fmt::format("{}if ({}) {{\n", Indent(), expr_parser.GetResult());
-        scope++;
-        ASTNode current = ast.nodes.GetFirst();
-        while (current) {
-            Visit(current);
-            current = current->GetNext();
-        }
-        scope--;
-        inner += fmt::format("{}}}\n", Indent());
-    }
-
-    void operator()(const ASTIfElse& ast) {
-        inner += Indent();
-        inner += "else {\n";
-
-        scope++;
-        ASTNode current = ast.nodes.GetFirst();
-        while (current) {
-            Visit(current);
-            current = current->GetNext();
-        }
-        scope--;
-
-        inner += Indent();
-        inner += "}\n";
-    }
-
-    void operator()(const ASTBlockEncoded& ast) {
-        inner += fmt::format("{}Block({}, {});\n", Indent(), ast.start, ast.end);
-    }
-
-    void operator()([[maybe_unused]] const ASTBlockDecoded& ast) {
-        inner += Indent();
-        inner += "Block;\n";
-    }
-
-    void operator()(const ASTVarSet& ast) {
-        ExprPrinter expr_parser{};
-        std::visit(expr_parser, *ast.condition);
-        inner += fmt::format("{}V{} := {};\n", Indent(), ast.index, expr_parser.GetResult());
-    }
-
-    void operator()(const ASTLabel& ast) {
-        inner += fmt::format("Label_{}:\n", ast.index);
-    }
-
-    void operator()(const ASTGoto& ast) {
-        ExprPrinter expr_parser{};
-        std::visit(expr_parser, *ast.condition);
-        inner +=
-            fmt::format("{}({}) -> goto Label_{};\n", Indent(), expr_parser.GetResult(), ast.label);
-    }
-
-    void operator()(const ASTDoWhile& ast) {
-        ExprPrinter expr_parser{};
-        std::visit(expr_parser, *ast.condition);
-        inner += fmt::format("{}do {{\n", Indent());
-        scope++;
-        ASTNode current = ast.nodes.GetFirst();
-        while (current) {
-            Visit(current);
-            current = current->GetNext();
-        }
-        scope--;
-        inner += fmt::format("{}}} while ({});\n", Indent(), expr_parser.GetResult());
-    }
-
-    void operator()(const ASTReturn& ast) {
-        ExprPrinter expr_parser{};
-        std::visit(expr_parser, *ast.condition);
-        inner += fmt::format("{}({}) -> {};\n", Indent(), expr_parser.GetResult(),
-                             ast.kills ? "discard" : "exit");
-    }
-
-    void operator()(const ASTBreak& ast) {
-        ExprPrinter expr_parser{};
-        std::visit(expr_parser, *ast.condition);
-        inner += fmt::format("{}({}) -> break;\n", Indent(), expr_parser.GetResult());
-    }
-
-    void Visit(const ASTNode& node) {
-        std::visit(*this, *node->GetInnerData());
-    }
-
-    const std::string& GetResult() const {
-        return inner;
-    }
-
-private:
-    std::string_view Indent() {
-        if (space_segment_scope == scope) {
-            return space_segment;
-        }
-
-        // Ensure that we don't exceed our view.
-        ASSERT(scope * 2 < spaces.size());
-
-        space_segment = spaces.substr(0, scope * 2);
-        space_segment_scope = scope;
-        return space_segment;
-    }
-
-    std::string inner{};
-    std::string_view space_segment;
-
-    u32 scope{};
-    u32 space_segment_scope{};
-
-    static constexpr std::string_view spaces{"                                    "};
-};
-
-std::string ASTManager::Print() const {
-    ASTPrinter printer{};
-    printer.Visit(main_node);
-    return printer.GetResult();
-}
-
-ASTManager::ASTManager(bool do_full_decompile, bool disable_else_derivation_)
-    : full_decompile{do_full_decompile}, disable_else_derivation{disable_else_derivation_} {}
-
-ASTManager::~ASTManager() {
-    Clear();
-}
-
-void ASTManager::Init() {
-    main_node = ASTBase::Make<ASTProgram>(ASTNode{});
-    program = std::get_if<ASTProgram>(main_node->GetInnerData());
-    false_condition = MakeExpr<ExprBoolean>(false);
-}
-
-void ASTManager::DeclareLabel(u32 address) {
-    const auto pair = labels_map.emplace(address, labels_count);
-    if (pair.second) {
-        labels_count++;
-        labels.resize(labels_count);
-    }
-}
-
-void ASTManager::InsertLabel(u32 address) {
-    const u32 index = labels_map[address];
-    const ASTNode label = ASTBase::Make<ASTLabel>(main_node, index);
-    labels[index] = label;
-    program->nodes.PushBack(label);
-}
-
-void ASTManager::InsertGoto(Expr condition, u32 address) {
-    const u32 index = labels_map[address];
-    const ASTNode goto_node = ASTBase::Make<ASTGoto>(main_node, std::move(condition), index);
-    gotos.push_back(goto_node);
-    program->nodes.PushBack(goto_node);
-}
-
-void ASTManager::InsertBlock(u32 start_address, u32 end_address) {
-    ASTNode block = ASTBase::Make<ASTBlockEncoded>(main_node, start_address, end_address);
-    program->nodes.PushBack(std::move(block));
-}
-
-void ASTManager::InsertReturn(Expr condition, bool kills) {
-    ASTNode node = ASTBase::Make<ASTReturn>(main_node, std::move(condition), kills);
-    program->nodes.PushBack(std::move(node));
-}
-
-// The decompile algorithm is based on
-// "Taming control flow: A structured approach to eliminating goto statements"
-// by AM Erosa, LJ Hendren 1994. In general, the idea is to get gotos to be
-// on the same structured level as the label which they jump to. This is done,
-// through outward/inward movements and lifting. Once they are at the same
-// level, you can enclose them in an "if" structure or a "do-while" structure.
-void ASTManager::Decompile() {
-    auto it = gotos.begin();
-    while (it != gotos.end()) {
-        const ASTNode goto_node = *it;
-        const auto label_index = goto_node->GetGotoLabel();
-        if (!label_index) {
-            return;
-        }
-        const ASTNode label = labels[*label_index];
-        if (!full_decompile) {
-            // We only decompile backward jumps
-            if (!IsBackwardsJump(goto_node, label)) {
-                it++;
-                continue;
-            }
-        }
-        if (IndirectlyRelated(goto_node, label)) {
-            while (!DirectlyRelated(goto_node, label)) {
-                MoveOutward(goto_node);
-            }
-        }
-        if (DirectlyRelated(goto_node, label)) {
-            u32 goto_level = goto_node->GetLevel();
-            const u32 label_level = label->GetLevel();
-            while (label_level < goto_level) {
-                MoveOutward(goto_node);
-                goto_level--;
-            }
-            // TODO(Blinkhawk): Implement Lifting and Inward Movements
-        }
-        if (label->GetParent() == goto_node->GetParent()) {
-            bool is_loop = false;
-            ASTNode current = goto_node->GetPrevious();
-            while (current) {
-                if (current == label) {
-                    is_loop = true;
-                    break;
-                }
-                current = current->GetPrevious();
-            }
-
-            if (is_loop) {
-                EncloseDoWhile(goto_node, label);
-            } else {
-                EncloseIfThen(goto_node, label);
-            }
-            it = gotos.erase(it);
-            continue;
-        }
-        it++;
-    }
-    if (full_decompile) {
-        for (const ASTNode& label : labels) {
-            auto& manager = label->GetManager();
-            manager.Remove(label);
-        }
-        labels.clear();
-    } else {
-        auto label_it = labels.begin();
-        while (label_it != labels.end()) {
-            bool can_remove = true;
-            ASTNode label = *label_it;
-            for (const ASTNode& goto_node : gotos) {
-                const auto label_index = goto_node->GetGotoLabel();
-                if (!label_index) {
-                    return;
-                }
-                ASTNode& glabel = labels[*label_index];
-                if (glabel == label) {
-                    can_remove = false;
-                    break;
-                }
-            }
-            if (can_remove) {
-                label->MarkLabelUnused();
-            }
-        }
-    }
-}
-
-bool ASTManager::IsBackwardsJump(ASTNode goto_node, ASTNode label_node) const {
-    u32 goto_level = goto_node->GetLevel();
-    u32 label_level = label_node->GetLevel();
-    while (goto_level > label_level) {
-        goto_level--;
-        goto_node = goto_node->GetParent();
-    }
-    while (label_level > goto_level) {
-        label_level--;
-        label_node = label_node->GetParent();
-    }
-    while (goto_node->GetParent() != label_node->GetParent()) {
-        goto_node = goto_node->GetParent();
-        label_node = label_node->GetParent();
-    }
-    ASTNode current = goto_node->GetPrevious();
-    while (current) {
-        if (current == label_node) {
-            return true;
-        }
-        current = current->GetPrevious();
-    }
-    return false;
-}
-
-bool ASTManager::IndirectlyRelated(const ASTNode& first, const ASTNode& second) const {
-    return !(first->GetParent() == second->GetParent() || DirectlyRelated(first, second));
-}
-
-bool ASTManager::DirectlyRelated(const ASTNode& first, const ASTNode& second) const {
-    if (first->GetParent() == second->GetParent()) {
-        return false;
-    }
-    const u32 first_level = first->GetLevel();
-    const u32 second_level = second->GetLevel();
-    u32 min_level;
-    u32 max_level;
-    ASTNode max;
-    ASTNode min;
-    if (first_level > second_level) {
-        min_level = second_level;
-        min = second;
-        max_level = first_level;
-        max = first;
-    } else {
-        min_level = first_level;
-        min = first;
-        max_level = second_level;
-        max = second;
-    }
-
-    while (max_level > min_level) {
-        max_level--;
-        max = max->GetParent();
-    }
-
-    return min->GetParent() == max->GetParent();
-}
-
-void ASTManager::ShowCurrentState(std::string_view state) const {
-    LOG_CRITICAL(HW_GPU, "\nState {}:\n\n{}\n", state, Print());
-    SanityCheck();
-}
-
-void ASTManager::SanityCheck() const {
-    for (const auto& label : labels) {
-        if (!label->GetParent()) {
-            LOG_CRITICAL(HW_GPU, "Sanity Check Failed");
-        }
-    }
-}
-
-void ASTManager::EncloseDoWhile(ASTNode goto_node, ASTNode label) {
-    ASTZipper& zipper = goto_node->GetManager();
-    const ASTNode loop_start = label->GetNext();
-    if (loop_start == goto_node) {
-        zipper.Remove(goto_node);
-        return;
-    }
-    const ASTNode parent = label->GetParent();
-    const Expr condition = goto_node->GetGotoCondition();
-    zipper.DetachSegment(loop_start, goto_node);
-    const ASTNode do_while_node = ASTBase::Make<ASTDoWhile>(parent, condition);
-    ASTZipper* sub_zipper = do_while_node->GetSubNodes();
-    sub_zipper->Init(loop_start, do_while_node);
-    zipper.InsertAfter(do_while_node, label);
-    sub_zipper->Remove(goto_node);
-}
-
-void ASTManager::EncloseIfThen(ASTNode goto_node, ASTNode label) {
-    ASTZipper& zipper = goto_node->GetManager();
-    const ASTNode if_end = label->GetPrevious();
-    if (if_end == goto_node) {
-        zipper.Remove(goto_node);
-        return;
-    }
-    const ASTNode prev = goto_node->GetPrevious();
-    const Expr condition = goto_node->GetGotoCondition();
-    bool do_else = false;
-    if (!disable_else_derivation && prev->IsIfThen()) {
-        const Expr if_condition = prev->GetIfCondition();
-        do_else = ExprAreEqual(if_condition, condition);
-    }
-    const ASTNode parent = label->GetParent();
-    zipper.DetachSegment(goto_node, if_end);
-    ASTNode if_node;
-    if (do_else) {
-        if_node = ASTBase::Make<ASTIfElse>(parent);
-    } else {
-        Expr neg_condition = MakeExprNot(condition);
-        if_node = ASTBase::Make<ASTIfThen>(parent, neg_condition);
-    }
-    ASTZipper* sub_zipper = if_node->GetSubNodes();
-    sub_zipper->Init(goto_node, if_node);
-    zipper.InsertAfter(if_node, prev);
-    sub_zipper->Remove(goto_node);
-}
-
-void ASTManager::MoveOutward(ASTNode goto_node) {
-    ASTZipper& zipper = goto_node->GetManager();
-    const ASTNode parent = goto_node->GetParent();
-    ASTZipper& zipper2 = parent->GetManager();
-    const ASTNode grandpa = parent->GetParent();
-    const bool is_loop = parent->IsLoop();
-    const bool is_else = parent->IsIfElse();
-    const bool is_if = parent->IsIfThen();
-
-    const ASTNode prev = goto_node->GetPrevious();
-    const ASTNode post = goto_node->GetNext();
-
-    const Expr condition = goto_node->GetGotoCondition();
-    zipper.DetachSingle(goto_node);
-    if (is_loop) {
-        const u32 var_index = NewVariable();
-        const Expr var_condition = MakeExpr<ExprVar>(var_index);
-        const ASTNode var_node = ASTBase::Make<ASTVarSet>(parent, var_index, condition);
-        const ASTNode var_node_init = ASTBase::Make<ASTVarSet>(parent, var_index, false_condition);
-        zipper2.InsertBefore(var_node_init, parent);
-        zipper.InsertAfter(var_node, prev);
-        goto_node->SetGotoCondition(var_condition);
-        const ASTNode break_node = ASTBase::Make<ASTBreak>(parent, var_condition);
-        zipper.InsertAfter(break_node, var_node);
-    } else if (is_if || is_else) {
-        const u32 var_index = NewVariable();
-        const Expr var_condition = MakeExpr<ExprVar>(var_index);
-        const ASTNode var_node = ASTBase::Make<ASTVarSet>(parent, var_index, condition);
-        const ASTNode var_node_init = ASTBase::Make<ASTVarSet>(parent, var_index, false_condition);
-        if (is_if) {
-            zipper2.InsertBefore(var_node_init, parent);
-        } else {
-            zipper2.InsertBefore(var_node_init, parent->GetPrevious());
-        }
-        zipper.InsertAfter(var_node, prev);
-        goto_node->SetGotoCondition(var_condition);
-        if (post) {
-            zipper.DetachTail(post);
-            const ASTNode if_node = ASTBase::Make<ASTIfThen>(parent, MakeExprNot(var_condition));
-            ASTZipper* sub_zipper = if_node->GetSubNodes();
-            sub_zipper->Init(post, if_node);
-            zipper.InsertAfter(if_node, var_node);
-        }
-    } else {
-        UNREACHABLE();
-    }
-    const ASTNode next = parent->GetNext();
-    if (is_if && next && next->IsIfElse()) {
-        zipper2.InsertAfter(goto_node, next);
-        goto_node->SetParent(grandpa);
-        return;
-    }
-    zipper2.InsertAfter(goto_node, parent);
-    goto_node->SetParent(grandpa);
-}
-
-class ASTClearer {
-public:
-    ASTClearer() = default;
-
-    void operator()(const ASTProgram& ast) {
-        ASTNode current = ast.nodes.GetFirst();
-        while (current) {
-            Visit(current);
-            current = current->GetNext();
-        }
-    }
-
-    void operator()(const ASTIfThen& ast) {
-        ASTNode current = ast.nodes.GetFirst();
-        while (current) {
-            Visit(current);
-            current = current->GetNext();
-        }
-    }
-
-    void operator()(const ASTIfElse& ast) {
-        ASTNode current = ast.nodes.GetFirst();
-        while (current) {
-            Visit(current);
-            current = current->GetNext();
-        }
-    }
-
-    void operator()([[maybe_unused]] const ASTBlockEncoded& ast) {}
-
-    void operator()(ASTBlockDecoded& ast) {
-        ast.nodes.clear();
-    }
-
-    void operator()([[maybe_unused]] const ASTVarSet& ast) {}
-
-    void operator()([[maybe_unused]] const ASTLabel& ast) {}
-
-    void operator()([[maybe_unused]] const ASTGoto& ast) {}
-
-    void operator()(const ASTDoWhile& ast) {
-        ASTNode current = ast.nodes.GetFirst();
-        while (current) {
-            Visit(current);
-            current = current->GetNext();
-        }
-    }
-
-    void operator()([[maybe_unused]] const ASTReturn& ast) {}
-
-    void operator()([[maybe_unused]] const ASTBreak& ast) {}
-
-    void Visit(const ASTNode& node) {
-        std::visit(*this, *node->GetInnerData());
-        node->Clear();
-    }
-};
-
-void ASTManager::Clear() {
-    if (!main_node) {
-        return;
-    }
-    ASTClearer clearer{};
-    clearer.Visit(main_node);
-    main_node.reset();
-    program = nullptr;
-    labels_map.clear();
-    labels.clear();
-    gotos.clear();
-}
-
-} // namespace VideoCommon::Shader
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