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gl_shader_decompiler: Implement AST decompiling
This commit is contained in:
parent
6fdd501113
commit
38fc995f6c
@ -20,6 +20,7 @@
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#include "video_core/renderer_opengl/gl_rasterizer.h"
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#include "video_core/renderer_opengl/gl_shader_decompiler.h"
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#include "video_core/shader/node.h"
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#include "video_core/shader/ast.h"
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#include "video_core/shader/shader_ir.h"
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namespace OpenGL::GLShader {
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@ -334,43 +335,26 @@ constexpr bool IsVertexShader(ProgramType stage) {
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return stage == ProgramType::VertexA || stage == ProgramType::VertexB;
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}
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class ASTDecompiler;
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class ExprDecompiler;
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class GLSLDecompiler final {
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public:
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explicit GLSLDecompiler(const Device& device, const ShaderIR& ir, ProgramType stage,
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std::string suffix)
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: device{device}, ir{ir}, stage{stage}, suffix{suffix}, header{ir.GetHeader()} {}
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void Decompile() {
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DeclareVertex();
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DeclareGeometry();
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DeclareRegisters();
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DeclarePredicates();
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DeclareLocalMemory();
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DeclareSharedMemory();
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DeclareInternalFlags();
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DeclareInputAttributes();
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DeclareOutputAttributes();
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DeclareConstantBuffers();
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DeclareGlobalMemory();
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DeclareSamplers();
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DeclarePhysicalAttributeReader();
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DeclareImages();
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code.AddLine("void execute_{}() {{", suffix);
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++code.scope;
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void DecompileBranchMode() {
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// VM's program counter
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const auto first_address = ir.GetBasicBlocks().begin()->first;
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code.AddLine("uint jmp_to = {}U;", first_address);
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// TODO(Subv): Figure out the actual depth of the flow stack, for now it seems
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// unlikely that shaders will use 20 nested SSYs and PBKs.
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if (!ir.IsFlowStackDisabled()) {
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constexpr u32 FLOW_STACK_SIZE = 20;
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for (const auto stack : std::array{MetaStackClass::Ssy, MetaStackClass::Pbk}) {
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code.AddLine("uint {}[{}];", FlowStackName(stack), FLOW_STACK_SIZE);
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code.AddLine("uint {} = 0U;", FlowStackTopName(stack));
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}
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constexpr u32 FLOW_STACK_SIZE = 20;
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for (const auto stack : std::array{MetaStackClass::Ssy, MetaStackClass::Pbk}) {
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code.AddLine("uint {}[{}];", FlowStackName(stack), FLOW_STACK_SIZE);
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code.AddLine("uint {} = 0u;", FlowStackTopName(stack));
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}
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code.AddLine("while (true) {{");
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@ -392,10 +376,37 @@ public:
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code.AddLine("default: return;");
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code.AddLine("}}");
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for (std::size_t i = 0; i < 2; ++i) {
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--code.scope;
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code.AddLine("}}");
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--code.scope;
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code.AddLine("}}");
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}
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void DecompileAST();
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void Decompile() {
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DeclareVertex();
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DeclareGeometry();
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DeclareRegisters();
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DeclarePredicates();
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DeclareLocalMemory();
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DeclareInternalFlags();
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DeclareInputAttributes();
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DeclareOutputAttributes();
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DeclareConstantBuffers();
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DeclareGlobalMemory();
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DeclareSamplers();
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DeclarePhysicalAttributeReader();
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code.AddLine("void execute_{}() {{", suffix);
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++code.scope;
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if (ir.IsDecompiled()) {
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DecompileAST();
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} else {
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DecompileBranchMode();
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}
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--code.scope;
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code.AddLine("}}");
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}
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std::string GetResult() {
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@ -424,6 +435,9 @@ public:
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}
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private:
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friend class ASTDecompiler;
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friend class ExprDecompiler;
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void DeclareVertex() {
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if (!IsVertexShader(stage))
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return;
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@ -1821,7 +1835,7 @@ private:
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return {};
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}
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Expression Exit(Operation operation) {
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Expression WriteExit() {
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if (stage != ProgramType::Fragment) {
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code.AddLine("return;");
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return {};
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@ -1861,6 +1875,10 @@ private:
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return {};
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}
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Expression Exit(Operation operation) {
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return WriteExit();
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}
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Expression Discard(Operation operation) {
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// Enclose "discard" in a conditional, so that GLSL compilation does not complain
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// about unexecuted instructions that may follow this.
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@ -2253,6 +2271,201 @@ private:
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ShaderWriter code;
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};
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const std::string flow_var = "flow_var_";
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class ExprDecompiler {
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public:
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ExprDecompiler(GLSLDecompiler& decomp) : decomp{decomp} {}
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void operator()(VideoCommon::Shader::ExprAnd& expr) {
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inner += "( ";
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std::visit(*this, *expr.operand1);
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inner += " && ";
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std::visit(*this, *expr.operand2);
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inner += ')';
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}
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void operator()(VideoCommon::Shader::ExprOr& expr) {
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inner += "( ";
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std::visit(*this, *expr.operand1);
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inner += " || ";
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std::visit(*this, *expr.operand2);
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inner += ')';
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}
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void operator()(VideoCommon::Shader::ExprNot& expr) {
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inner += '!';
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std::visit(*this, *expr.operand1);
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}
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void operator()(VideoCommon::Shader::ExprPredicate& expr) {
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auto pred = static_cast<Tegra::Shader::Pred>(expr.predicate);
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inner += decomp.GetPredicate(pred);
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}
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void operator()(VideoCommon::Shader::ExprCondCode& expr) {
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Node cc = decomp.ir.GetConditionCode(expr.cc);
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std::string target;
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if (const auto pred = std::get_if<PredicateNode>(&*cc)) {
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const auto index = pred->GetIndex();
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switch (index) {
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case Tegra::Shader::Pred::NeverExecute:
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target = "false";
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case Tegra::Shader::Pred::UnusedIndex:
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target = "true";
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default:
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target = decomp.GetPredicate(index);
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}
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} else if (const auto flag = std::get_if<InternalFlagNode>(&*cc)) {
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target = decomp.GetInternalFlag(flag->GetFlag());
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}
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inner += target;
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}
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void operator()(VideoCommon::Shader::ExprVar& expr) {
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inner += flow_var + std::to_string(expr.var_index);
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}
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void operator()(VideoCommon::Shader::ExprBoolean& expr) {
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inner += expr.value ? "true" : "false";
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}
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std::string& GetResult() {
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return inner;
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}
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private:
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std::string inner{};
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GLSLDecompiler& decomp;
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};
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class ASTDecompiler {
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public:
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ASTDecompiler(GLSLDecompiler& decomp) : decomp{decomp} {}
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void operator()(VideoCommon::Shader::ASTProgram& ast) {
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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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}
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void operator()(VideoCommon::Shader::ASTIfThen& ast) {
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ExprDecompiler expr_parser{decomp};
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std::visit(expr_parser, *ast.condition);
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decomp.code.AddLine("if ({}) {{", expr_parser.GetResult());
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decomp.code.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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decomp.code.scope--;
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decomp.code.AddLine("}}");
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}
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void operator()(VideoCommon::Shader::ASTIfElse& ast) {
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decomp.code.AddLine("else {{");
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decomp.code.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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decomp.code.scope--;
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decomp.code.AddLine("}}");
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}
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void operator()(VideoCommon::Shader::ASTBlockEncoded& ast) {
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UNREACHABLE();
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}
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void operator()(VideoCommon::Shader::ASTBlockDecoded& ast) {
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decomp.VisitBlock(ast.nodes);
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}
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void operator()(VideoCommon::Shader::ASTVarSet& ast) {
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ExprDecompiler expr_parser{decomp};
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std::visit(expr_parser, *ast.condition);
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decomp.code.AddLine("{}{} = {};", flow_var, ast.index, expr_parser.GetResult());
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}
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void operator()(VideoCommon::Shader::ASTLabel& ast) {
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decomp.code.AddLine("// Label_{}:", ast.index);
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}
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void operator()(VideoCommon::Shader::ASTGoto& ast) {
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UNREACHABLE();
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}
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void operator()(VideoCommon::Shader::ASTDoWhile& ast) {
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ExprDecompiler expr_parser{decomp};
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std::visit(expr_parser, *ast.condition);
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decomp.code.AddLine("do {{");
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decomp.code.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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decomp.code.scope--;
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decomp.code.AddLine("}} while({});", expr_parser.GetResult());
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}
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void operator()(VideoCommon::Shader::ASTReturn& ast) {
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bool is_true = VideoCommon::Shader::ExprIsTrue(ast.condition);
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if (!is_true) {
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ExprDecompiler expr_parser{decomp};
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std::visit(expr_parser, *ast.condition);
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decomp.code.AddLine("if ({}) {{", expr_parser.GetResult());
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decomp.code.scope++;
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}
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if (ast.kills) {
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decomp.code.AddLine("discard;");
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} else {
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decomp.WriteExit();
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}
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if (!is_true) {
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decomp.code.scope--;
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decomp.code.AddLine("}}");
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}
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}
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void operator()(VideoCommon::Shader::ASTBreak& ast) {
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bool is_true = VideoCommon::Shader::ExprIsTrue(ast.condition);
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if (!is_true) {
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ExprDecompiler expr_parser{decomp};
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std::visit(expr_parser, *ast.condition);
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decomp.code.AddLine("if ({}) {{", expr_parser.GetResult());
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decomp.code.scope++;
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}
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decomp.code.AddLine("break;");
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if (!is_true) {
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decomp.code.scope--;
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decomp.code.AddLine("}}");
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}
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}
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void Visit(VideoCommon::Shader::ASTNode& node) {
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std::visit(*this, *node->GetInnerData());
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}
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private:
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GLSLDecompiler& decomp;
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};
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void GLSLDecompiler::DecompileAST() {
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u32 num_flow_variables = ir.GetASTNumVariables();
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for (u32 i = 0; i < num_flow_variables; i++) {
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code.AddLine("bool {}{} = false;", flow_var, i);
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}
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ASTDecompiler decompiler{*this};
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VideoCommon::Shader::ASTNode program = ir.GetASTProgram();
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decompiler.Visit(program);
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}
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} // Anonymous namespace
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std::string GetCommonDeclarations() {
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@ -372,13 +372,13 @@ ASTManager::~ASTManager() {
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void ASTManager::Init() {
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main_node = ASTBase::Make<ASTProgram>(ASTNode{});
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program = std::get_if<ASTProgram>(main_node->GetInnerData());
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true_condition = MakeExpr<ExprBoolean>(true);
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false_condition = MakeExpr<ExprBoolean>(false);
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}
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ASTManager::ASTManager(ASTManager&& other)
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: labels_map(std::move(other.labels_map)), labels_count{other.labels_count},
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gotos(std::move(other.gotos)), labels(std::move(other.labels)), variables{other.variables},
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program{other.program}, main_node{other.main_node}, true_condition{other.true_condition} {
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program{other.program}, main_node{other.main_node}, false_condition{other.false_condition} {
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other.main_node.reset();
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}
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@ -390,7 +390,7 @@ ASTManager& ASTManager::operator=(ASTManager&& other) {
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variables = other.variables;
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program = other.program;
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main_node = other.main_node;
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true_condition = other.true_condition;
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false_condition = other.false_condition;
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other.main_node.reset();
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return *this;
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@ -594,7 +594,7 @@ void ASTManager::MoveOutward(ASTNode goto_node) {
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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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ASTNode var_node_init = ASTBase::Make<ASTVarSet>(parent, var_index, true_condition);
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ASTNode var_node_init = ASTBase::Make<ASTVarSet>(parent, var_index, false_condition);
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zipper2.InsertBefore(var_node_init, parent);
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zipper.InsertAfter(var_node, prev);
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goto_node->SetGotoCondition(var_condition);
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@ -605,7 +605,7 @@ void ASTManager::MoveOutward(ASTNode goto_node) {
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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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ASTNode var_node_init = ASTBase::Make<ASTVarSet>(parent, var_index, true_condition);
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ASTNode var_node_init = ASTBase::Make<ASTVarSet>(parent, var_index, false_condition);
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if (is_if) {
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zipper2.InsertBefore(var_node_init, parent);
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} else {
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@ -141,8 +141,6 @@ public:
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Expr condition;
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};
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using TransformCallback = std::function<NodeBlock(u32 start, u32 end)>;
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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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@ -233,11 +231,7 @@ public:
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return std::holds_alternative<ASTBlockEncoded>(data);
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}
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void TransformBlockEncoded(TransformCallback& callback) {
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auto block = std::get_if<ASTBlockEncoded>(&data);
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const u32 start = block->start;
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const u32 end = block->end;
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NodeBlock nodes = callback(start, end);
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void TransformBlockEncoded(NodeBlock& nodes) {
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data = ASTBlockDecoded(nodes);
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}
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@ -309,16 +303,20 @@ public:
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void SanityCheck();
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bool IsFullyDecompiled() {
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bool IsFullyDecompiled() const {
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return gotos.size() == 0;
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}
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ASTNode GetProgram() {
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ASTNode GetProgram() const {
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return main_node;
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}
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void Clear();
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u32 GetVariables() const {
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return variables;
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}
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private:
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bool IndirectlyRelated(ASTNode first, ASTNode second);
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@ -343,7 +341,7 @@ private:
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u32 variables{};
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ASTProgram* program{};
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ASTNode main_node{};
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Expr true_condition{};
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Expr false_condition{};
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};
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} // namespace VideoCommon::Shader
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@ -425,7 +425,7 @@ void InsertBranch(ASTManager& mm, const BlockBranchInfo& branch) {
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}
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if (cond.predicate != Pred::UnusedIndex) {
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u32 pred = static_cast<u32>(cond.predicate);
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bool negate;
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bool negate = false;
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if (pred > 7) {
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negate = true;
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pred -= 8;
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@ -74,6 +74,6 @@ struct ShaderCharacteristics {
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};
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std::unique_ptr<ShaderCharacteristics> ScanFlow(const ProgramCode& program_code, u32 program_size,
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u32 start_address, ASTManager& manager);
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u32 start_address, ASTManager& manager);
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} // namespace VideoCommon::Shader
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@ -35,10 +35,73 @@ constexpr bool IsSchedInstruction(u32 offset, u32 main_offset) {
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} // namespace
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class ASTDecoder {
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public:
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ASTDecoder(ShaderIR& ir) : ir(ir) {}
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void operator()(ASTProgram& ast) {
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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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}
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void operator()(ASTIfThen& ast) {
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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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}
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void operator()(ASTIfElse& ast) {
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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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}
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void operator()(ASTBlockEncoded& ast) {}
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void operator()(ASTBlockDecoded& ast) {}
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void operator()(ASTVarSet& ast) {}
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void operator()(ASTLabel& ast) {}
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void operator()(ASTGoto& ast) {}
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void operator()(ASTDoWhile& ast) {
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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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}
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void operator()(ASTReturn& ast) {}
|
||||
|
||||
void operator()(ASTBreak& ast) {}
|
||||
|
||||
void Visit(ASTNode& node) {
|
||||
std::visit(*this, *node->GetInnerData());
|
||||
if (node->IsBlockEncoded()) {
|
||||
auto block = std::get_if<ASTBlockEncoded>(node->GetInnerData());
|
||||
NodeBlock bb = ir.DecodeRange(block->start, block->end);
|
||||
node->TransformBlockEncoded(bb);
|
||||
}
|
||||
}
|
||||
|
||||
private:
|
||||
ShaderIR& ir;
|
||||
};
|
||||
|
||||
void ShaderIR::Decode() {
|
||||
std::memcpy(&header, program_code.data(), sizeof(Tegra::Shader::Header));
|
||||
|
||||
disable_flow_stack = false;
|
||||
decompiled = false;
|
||||
const auto info =
|
||||
ScanFlow(program_code, program_size, main_offset, program_manager);
|
||||
if (info) {
|
||||
@ -46,7 +109,10 @@ void ShaderIR::Decode() {
|
||||
coverage_begin = shader_info.start;
|
||||
coverage_end = shader_info.end;
|
||||
if (shader_info.decompiled) {
|
||||
disable_flow_stack = true;
|
||||
decompiled = true;
|
||||
ASTDecoder decoder{*this};
|
||||
ASTNode program = GetASTProgram();
|
||||
decoder.Visit(program);
|
||||
return;
|
||||
}
|
||||
LOG_WARNING(HW_GPU, "Flow Stack Removing Failed! Falling back to old method");
|
||||
|
@ -157,7 +157,7 @@ u32 ShaderIR::DecodeOther(NodeBlock& bb, u32 pc) {
|
||||
UNIMPLEMENTED_IF_MSG(instr.bra.constant_buffer != 0,
|
||||
"Constant buffer flow is not supported");
|
||||
|
||||
if (disable_flow_stack) {
|
||||
if (decompiled) {
|
||||
break;
|
||||
}
|
||||
|
||||
@ -171,7 +171,7 @@ u32 ShaderIR::DecodeOther(NodeBlock& bb, u32 pc) {
|
||||
UNIMPLEMENTED_IF_MSG(instr.bra.constant_buffer != 0,
|
||||
"Constant buffer PBK is not supported");
|
||||
|
||||
if (disable_flow_stack) {
|
||||
if (decompiled) {
|
||||
break;
|
||||
}
|
||||
|
||||
@ -186,7 +186,7 @@ u32 ShaderIR::DecodeOther(NodeBlock& bb, u32 pc) {
|
||||
UNIMPLEMENTED_IF_MSG(cc != Tegra::Shader::ConditionCode::T, "SYNC condition code used: {}",
|
||||
static_cast<u32>(cc));
|
||||
|
||||
if (disable_flow_stack) {
|
||||
if (decompiled) {
|
||||
break;
|
||||
}
|
||||
|
||||
@ -198,7 +198,7 @@ u32 ShaderIR::DecodeOther(NodeBlock& bb, u32 pc) {
|
||||
const Tegra::Shader::ConditionCode cc = instr.flow_condition_code;
|
||||
UNIMPLEMENTED_IF_MSG(cc != Tegra::Shader::ConditionCode::T, "BRK condition code used: {}",
|
||||
static_cast<u32>(cc));
|
||||
if (disable_flow_stack) {
|
||||
if (decompiled) {
|
||||
break;
|
||||
}
|
||||
|
||||
|
@ -72,4 +72,11 @@ bool ExprAreOpposite(Expr first, Expr second) {
|
||||
return false;
|
||||
}
|
||||
|
||||
bool ExprIsTrue(Expr first) {
|
||||
if (ExprIsBoolean(first)) {
|
||||
return ExprBooleanGet(first);
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
} // namespace VideoCommon::Shader
|
||||
|
@ -115,4 +115,6 @@ Expr MakeExprAnd(Expr first, Expr second);
|
||||
|
||||
Expr MakeExprOr(Expr first, Expr second);
|
||||
|
||||
bool ExprIsTrue(Expr first);
|
||||
|
||||
} // namespace VideoCommon::Shader
|
||||
|
@ -137,7 +137,7 @@ Node ShaderIR::GetOutputAttribute(Attribute::Index index, u64 element, Node buff
|
||||
return MakeNode<AbufNode>(index, static_cast<u32>(element), std::move(buffer));
|
||||
}
|
||||
|
||||
Node ShaderIR::GetInternalFlag(InternalFlag flag, bool negated) {
|
||||
Node ShaderIR::GetInternalFlag(InternalFlag flag, bool negated) const {
|
||||
const Node node = MakeNode<InternalFlagNode>(flag);
|
||||
if (negated) {
|
||||
return Operation(OperationCode::LogicalNegate, node);
|
||||
@ -367,13 +367,13 @@ OperationCode ShaderIR::GetPredicateCombiner(PredOperation operation) {
|
||||
return op->second;
|
||||
}
|
||||
|
||||
Node ShaderIR::GetConditionCode(Tegra::Shader::ConditionCode cc) {
|
||||
Node ShaderIR::GetConditionCode(Tegra::Shader::ConditionCode cc) const {
|
||||
switch (cc) {
|
||||
case Tegra::Shader::ConditionCode::NEU:
|
||||
return GetInternalFlag(InternalFlag::Zero, true);
|
||||
default:
|
||||
UNIMPLEMENTED_MSG("Unimplemented condition code: {}", static_cast<u32>(cc));
|
||||
return GetPredicate(static_cast<u64>(Pred::NeverExecute));
|
||||
return MakeNode<PredicateNode>(Pred::NeverExecute, false);
|
||||
}
|
||||
}
|
||||
|
||||
|
@ -15,8 +15,8 @@
|
||||
#include "video_core/engines/maxwell_3d.h"
|
||||
#include "video_core/engines/shader_bytecode.h"
|
||||
#include "video_core/engines/shader_header.h"
|
||||
#include "video_core/shader/node.h"
|
||||
#include "video_core/shader/ast.h"
|
||||
#include "video_core/shader/node.h"
|
||||
|
||||
namespace VideoCommon::Shader {
|
||||
|
||||
@ -141,15 +141,27 @@ public:
|
||||
return header;
|
||||
}
|
||||
|
||||
bool IsFlowStackDisabled() const {
|
||||
return disable_flow_stack;
|
||||
bool IsDecompiled() const {
|
||||
return decompiled;
|
||||
}
|
||||
|
||||
ASTNode GetASTProgram() const {
|
||||
return program_manager.GetProgram();
|
||||
}
|
||||
|
||||
u32 GetASTNumVariables() const {
|
||||
return program_manager.GetVariables();
|
||||
}
|
||||
|
||||
u32 ConvertAddressToNvidiaSpace(const u32 address) const {
|
||||
return (address - main_offset) * sizeof(Tegra::Shader::Instruction);
|
||||
}
|
||||
|
||||
/// Returns a condition code evaluated from internal flags
|
||||
Node GetConditionCode(Tegra::Shader::ConditionCode cc) const;
|
||||
|
||||
private:
|
||||
friend class ASTDecoder;
|
||||
void Decode();
|
||||
|
||||
NodeBlock DecodeRange(u32 begin, u32 end);
|
||||
@ -214,7 +226,7 @@ private:
|
||||
/// Generates a node representing an output attribute. Keeps track of used attributes.
|
||||
Node GetOutputAttribute(Tegra::Shader::Attribute::Index index, u64 element, Node buffer);
|
||||
/// Generates a node representing an internal flag
|
||||
Node GetInternalFlag(InternalFlag flag, bool negated = false);
|
||||
Node GetInternalFlag(InternalFlag flag, bool negated = false) const;
|
||||
/// Generates a node representing a local memory address
|
||||
Node GetLocalMemory(Node address);
|
||||
/// Generates a node representing a shared memory address
|
||||
@ -272,9 +284,6 @@ private:
|
||||
/// Returns a predicate combiner operation
|
||||
OperationCode GetPredicateCombiner(Tegra::Shader::PredOperation operation);
|
||||
|
||||
/// Returns a condition code evaluated from internal flags
|
||||
Node GetConditionCode(Tegra::Shader::ConditionCode cc);
|
||||
|
||||
/// Accesses a texture sampler
|
||||
const Sampler& GetSampler(const Tegra::Shader::Sampler& sampler,
|
||||
Tegra::Shader::TextureType type, bool is_array, bool is_shadow);
|
||||
@ -358,7 +367,7 @@ private:
|
||||
const ProgramCode& program_code;
|
||||
const u32 main_offset;
|
||||
const std::size_t program_size;
|
||||
bool disable_flow_stack{};
|
||||
bool decompiled{};
|
||||
|
||||
u32 coverage_begin{};
|
||||
u32 coverage_end{};
|
||||
|
Loading…
Reference in New Issue
Block a user