gl_shader_decompiler: Add skeleton code from Citra for shader analysis.
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bunnei
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@ -2,57 +2,158 @@
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <map>
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#include <set>
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#include <string>
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#include <queue>
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#include "common/assert.h"
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#include "common/common_types.h"
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#include "video_core/engines/shader_bytecode.h"
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#include "video_core/renderer_opengl/gl_shader_decompiler.h"
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namespace Maxwell3D {
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namespace Tegra {
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namespace Shader {
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namespace Decompiler {
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constexpr u32 PROGRAM_END = MAX_PROGRAM_CODE_LENGTH;
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class Impl {
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class DecompileFail : public std::runtime_error {
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public:
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Impl(const std::array<u32, MAX_PROGRAM_CODE_LENGTH>& program_code,
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const std::array<u32, MAX_SWIZZLE_DATA_LENGTH>& swizzle_data, u32 main_offset,
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const std::function<std::string(u32)>& inputreg_getter,
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const std::function<std::string(u32)>& outputreg_getter, bool sanitize_mul,
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const std::string& emit_cb, const std::string& setemit_cb)
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: program_code(program_code), swizzle_data(swizzle_data), main_offset(main_offset),
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inputreg_getter(inputreg_getter), outputreg_getter(outputreg_getter),
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sanitize_mul(sanitize_mul), emit_cb(emit_cb), setemit_cb(setemit_cb) {}
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using std::runtime_error::runtime_error;
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};
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std::string Decompile() {
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UNREACHABLE();
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return {};
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/// Describes the behaviour of code path of a given entry point and a return point.
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enum class ExitMethod {
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Undetermined, ///< Internal value. Only occur when analyzing JMP loop.
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AlwaysReturn, ///< All code paths reach the return point.
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Conditional, ///< Code path reaches the return point or an END instruction conditionally.
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AlwaysEnd, ///< All code paths reach a END instruction.
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};
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/// A subroutine is a range of code refereced by a CALL, IF or LOOP instruction.
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struct Subroutine {
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/// Generates a name suitable for GLSL source code.
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std::string GetName() const {
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return "sub_" + std::to_string(begin) + "_" + std::to_string(end);
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}
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u32 begin; ///< Entry point of the subroutine.
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u32 end; ///< Return point of the subroutine.
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ExitMethod exit_method; ///< Exit method of the subroutine.
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std::set<u32> labels; ///< Addresses refereced by JMP instructions.
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bool operator<(const Subroutine& rhs) const {
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return std::tie(begin, end) < std::tie(rhs.begin, rhs.end);
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}
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};
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/// Analyzes shader code and produces a set of subroutines.
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class ControlFlowAnalyzer {
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public:
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ControlFlowAnalyzer(const ProgramCode& program_code, u32 main_offset)
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: program_code(program_code) {
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// Recursively finds all subroutines.
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const Subroutine& program_main = AddSubroutine(main_offset, PROGRAM_END);
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if (program_main.exit_method != ExitMethod::AlwaysEnd)
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throw DecompileFail("Program does not always end");
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}
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std::set<Subroutine> GetSubroutines() {
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return std::move(subroutines);
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}
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private:
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const std::array<u32, MAX_PROGRAM_CODE_LENGTH>& program_code;
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const std::array<u32, MAX_SWIZZLE_DATA_LENGTH>& swizzle_data;
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u32 main_offset;
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const std::function<std::string(u32)>& inputreg_getter;
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const std::function<std::string(u32)>& outputreg_getter;
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bool sanitize_mul;
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const std::string& emit_cb;
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const std::string& setemit_cb;
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const ProgramCode& program_code;
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std::set<Subroutine> subroutines;
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std::map<std::pair<u32, u32>, ExitMethod> exit_method_map;
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/// Adds and analyzes a new subroutine if it is not added yet.
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const Subroutine& AddSubroutine(u32 begin, u32 end) {
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auto iter = subroutines.find(Subroutine{begin, end});
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if (iter != subroutines.end())
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return *iter;
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Subroutine subroutine{begin, end};
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subroutine.exit_method = Scan(begin, end, subroutine.labels);
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if (subroutine.exit_method == ExitMethod::Undetermined)
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throw DecompileFail("Recursive function detected");
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return *subroutines.insert(std::move(subroutine)).first;
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}
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/// Scans a range of code for labels and determines the exit method.
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ExitMethod Scan(u32 begin, u32 end, std::set<u32>& labels) {
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auto [iter, inserted] =
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exit_method_map.emplace(std::make_pair(begin, end), ExitMethod::Undetermined);
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ExitMethod& exit_method = iter->second;
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if (!inserted)
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return exit_method;
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for (u32 offset = begin; offset != end && offset != PROGRAM_END; ++offset) {
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const Instruction instr = {program_code[offset]};
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switch (instr.opcode.Value().EffectiveOpCode()) {
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case OpCode::Id::EXIT: {
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return exit_method = ExitMethod::AlwaysEnd;
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}
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}
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}
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return exit_method = ExitMethod::AlwaysReturn;
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}
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};
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std::string DecompileProgram(const std::array<u32, MAX_PROGRAM_CODE_LENGTH>& program_code,
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const std::array<u32, MAX_SWIZZLE_DATA_LENGTH>& swizzle_data,
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u32 main_offset,
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const std::function<std::string(u32)>& inputreg_getter,
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const std::function<std::string(u32)>& outputreg_getter,
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bool sanitize_mul, const std::string& emit_cb,
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const std::string& setemit_cb) {
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Impl impl(program_code, swizzle_data, main_offset, inputreg_getter, outputreg_getter,
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sanitize_mul, emit_cb, setemit_cb);
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return impl.Decompile();
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class ShaderWriter {
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public:
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void AddLine(const std::string& text) {
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DEBUG_ASSERT(scope >= 0);
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if (!text.empty()) {
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shader_source += std::string(static_cast<size_t>(scope) * 4, ' ');
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}
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shader_source += text + '\n';
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}
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std::string GetResult() {
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return std::move(shader_source);
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}
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int scope = 0;
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private:
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std::string shader_source;
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};
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class GLSLGenerator {
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public:
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GLSLGenerator(const std::set<Subroutine>& subroutines, const ProgramCode& program_code,
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u32 main_offset)
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: subroutines(subroutines), program_code(program_code), main_offset(main_offset) {
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Generate();
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}
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std::string GetShaderCode() {
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return shader.GetResult();
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}
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private:
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const std::set<Subroutine>& subroutines;
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const ProgramCode& program_code;
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const u32 main_offset;
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ShaderWriter shader;
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void Generate() {}
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};
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boost::optional<std::string> DecompileProgram(const ProgramCode& program_code, u32 main_offset) {
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try {
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auto subroutines = ControlFlowAnalyzer(program_code, main_offset).GetSubroutines();
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GLSLGenerator generator(subroutines, program_code, main_offset);
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return generator.GetShaderCode();
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} catch (const DecompileFail& exception) {
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LOG_ERROR(HW_GPU, "Shader decompilation failed: %s", exception.what());
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}
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return boost::none;
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}
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} // namespace Decompiler
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} // namespace Shader
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} // namespace Maxwell3D
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} // namespace Tegra
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@ -5,23 +5,20 @@
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#include <array>
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#include <functional>
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#include <string>
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#include <boost/optional.hpp>
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#include "common/common_types.h"
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namespace Maxwell3D {
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namespace Tegra {
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namespace Shader {
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namespace Decompiler {
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constexpr size_t MAX_PROGRAM_CODE_LENGTH{0x100000};
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constexpr size_t MAX_SWIZZLE_DATA_LENGTH{0x100000};
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constexpr size_t MAX_PROGRAM_CODE_LENGTH{0x100};
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constexpr size_t MAX_SWIZZLE_DATA_LENGTH{0x100};
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std::string DecompileProgram(const std::array<u32, MAX_PROGRAM_CODE_LENGTH>& program_code,
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const std::array<u32, MAX_SWIZZLE_DATA_LENGTH>& swizzle_data,
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u32 main_offset,
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const std::function<std::string(u32)>& inputreg_getter,
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const std::function<std::string(u32)>& outputreg_getter,
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bool sanitize_mul, const std::string& emit_cb = "",
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const std::string& setemit_cb = "");
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using ProgramCode = std::array<u64, MAX_PROGRAM_CODE_LENGTH>;
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boost::optional<std::string> DecompileProgram(const ProgramCode& program_code, u32 main_offset);
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} // namespace Decompiler
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} // namespace Shader
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} // namespace Maxwell3D
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} // namespace Tegra
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