394 lines
13 KiB
C++
394 lines
13 KiB
C++
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#include <list>
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#include <map>
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#include <unordered_set>
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#include <vector>
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#include "common/assert.h"
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#include "common/common_types.h"
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#include "video_core/shader/control_flow.h"
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#include "video_core/shader/shader_ir.h"
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namespace VideoCommon::Shader {
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using Tegra::Shader::Instruction;
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using Tegra::Shader::OpCode;
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constexpr s32 unassigned_branch = -2;
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struct BlockBranchInfo {
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Condition condition{};
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s32 address{exit_branch};
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bool kill{};
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bool is_sync{};
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bool is_brk{};
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};
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struct BlockInfo {
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BlockInfo() {}
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u32 start{};
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u32 end{};
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bool visited{};
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BlockBranchInfo branch{};
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bool IsInside(const u32 address) const {
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return start <= address && address <= end;
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}
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};
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struct Stamp {
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Stamp() = default;
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Stamp(u32 address, u32 target) : address{address}, target{target} {}
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u32 address{};
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u32 target{};
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bool operator==(const Stamp& sb) const {
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return std::tie(address, target) == std::tie(sb.address, sb.target);
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}
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bool operator<(const Stamp& sb) const {
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return address < sb.address;
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}
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bool operator>(const Stamp& sb) const {
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return address > sb.address;
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}
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bool operator<=(const Stamp& sb) const {
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return address <= sb.address;
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}
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bool operator>=(const Stamp& sb) const {
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return address >= sb.address;
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}
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};
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struct CFGRebuildState {
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explicit CFGRebuildState(const ProgramCode& program_code, const std::size_t program_size)
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: program_code{program_code}, program_size{program_size} {
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// queries.clear();
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block_info.clear();
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labels.clear();
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visited_address.clear();
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ssy_labels.clear();
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pbk_labels.clear();
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inspect_queries.clear();
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}
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std::vector<BlockInfo> block_info{};
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std::list<u32> inspect_queries{};
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// std::list<Query> queries{};
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std::unordered_set<u32> visited_address{};
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std::unordered_set<u32> labels{};
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std::set<Stamp> ssy_labels;
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std::set<Stamp> pbk_labels;
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const ProgramCode& program_code;
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const std::size_t program_size;
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};
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enum class BlockCollision : u32 { None = 0, Found = 1, Inside = 2 };
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std::pair<BlockCollision, std::vector<BlockInfo>::iterator> TryGetBlock(CFGRebuildState& state,
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u32 address) {
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auto it = state.block_info.begin();
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while (it != state.block_info.end()) {
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if (it->start == address) {
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return {BlockCollision::Found, it};
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}
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if (it->IsInside(address)) {
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return {BlockCollision::Inside, it};
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}
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it++;
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}
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return {BlockCollision::None, it};
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}
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struct ParseInfo {
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BlockBranchInfo branch_info{};
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u32 end_address{};
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};
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BlockInfo* CreateBlockInfo(CFGRebuildState& state, u32 start, u32 end) {
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auto& it = state.block_info.emplace_back();
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it.start = start;
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it.end = end;
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state.visited_address.insert(start);
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return ⁢
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}
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Pred GetPredicate(u32 index, bool negated) {
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return static_cast<Pred>(index + (negated ? 8 : 0));
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}
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enum class ParseResult : u32 {
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ControlCaught = 0,
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BlockEnd = 1,
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AbnormalFlow = 2,
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};
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ParseResult ParseCode(CFGRebuildState& state, u32 address, ParseInfo& parse_info) {
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u32 offset = static_cast<u32>(address);
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u32 end_address = static_cast<u32>(state.program_size - 10U) * 8U;
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auto insert_label = ([](CFGRebuildState& state, u32 address) {
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auto pair = state.labels.emplace(address);
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if (pair.second) {
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state.inspect_queries.push_back(address);
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}
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});
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while (true) {
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if (offset >= end_address) {
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parse_info.branch_info.address = exit_branch;
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break;
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}
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if (state.visited_address.count(offset) != 0) {
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parse_info.branch_info.address = offset;
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break;
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}
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const Instruction instr = {state.program_code[offset]};
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const auto opcode = OpCode::Decode(instr);
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if (!opcode || opcode->get().GetType() != OpCode::Type::Flow) {
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offset++;
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continue;
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}
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switch (opcode->get().GetId()) {
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case OpCode::Id::EXIT: {
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const auto pred_index = static_cast<u32>(instr.pred.pred_index);
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parse_info.branch_info.condition.predicate =
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GetPredicate(pred_index, instr.negate_pred != 0);
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if (parse_info.branch_info.condition.predicate == Pred::NeverExecute) {
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offset++;
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continue;
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}
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const ConditionCode cc = instr.flow_condition_code;
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parse_info.branch_info.condition.cc = cc;
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if (cc == ConditionCode::F) {
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offset++;
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continue;
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}
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parse_info.branch_info.address = exit_branch;
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parse_info.branch_info.kill = false;
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parse_info.branch_info.is_sync = false;
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parse_info.branch_info.is_brk = false;
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parse_info.end_address = offset;
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return ParseResult::ControlCaught;
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}
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case OpCode::Id::BRA: {
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if (instr.bra.constant_buffer != 0) {
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return ParseResult::AbnormalFlow;
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}
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const auto pred_index = static_cast<u32>(instr.pred.pred_index);
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parse_info.branch_info.condition.predicate =
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GetPredicate(pred_index, instr.negate_pred != 0);
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if (parse_info.branch_info.condition.predicate == Pred::NeverExecute) {
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offset++;
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continue;
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}
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const ConditionCode cc = instr.flow_condition_code;
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parse_info.branch_info.condition.cc = cc;
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if (cc == ConditionCode::F) {
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offset++;
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continue;
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}
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u32 branch_offset = offset + instr.bra.GetBranchTarget();
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if (branch_offset == 0) {
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parse_info.branch_info.address = exit_branch;
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} else {
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parse_info.branch_info.address = branch_offset;
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}
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insert_label(state, branch_offset);
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parse_info.branch_info.kill = false;
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parse_info.branch_info.is_sync = false;
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parse_info.branch_info.is_brk = false;
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parse_info.end_address = offset;
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return ParseResult::ControlCaught;
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}
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case OpCode::Id::SYNC: {
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parse_info.branch_info.condition;
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const auto pred_index = static_cast<u32>(instr.pred.pred_index);
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parse_info.branch_info.condition.predicate =
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GetPredicate(pred_index, instr.negate_pred != 0);
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if (parse_info.branch_info.condition.predicate == Pred::NeverExecute) {
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offset++;
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continue;
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}
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const ConditionCode cc = instr.flow_condition_code;
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parse_info.branch_info.condition.cc = cc;
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if (cc == ConditionCode::F) {
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offset++;
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continue;
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}
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parse_info.branch_info.address = unassigned_branch;
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parse_info.branch_info.kill = false;
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parse_info.branch_info.is_sync = true;
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parse_info.branch_info.is_brk = false;
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parse_info.end_address = offset;
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return ParseResult::ControlCaught;
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}
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case OpCode::Id::BRK: {
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parse_info.branch_info.condition;
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const auto pred_index = static_cast<u32>(instr.pred.pred_index);
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parse_info.branch_info.condition.predicate =
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GetPredicate(pred_index, instr.negate_pred != 0);
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if (parse_info.branch_info.condition.predicate == Pred::NeverExecute) {
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offset++;
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continue;
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}
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const ConditionCode cc = instr.flow_condition_code;
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parse_info.branch_info.condition.cc = cc;
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if (cc == ConditionCode::F) {
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offset++;
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continue;
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}
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parse_info.branch_info.address = unassigned_branch;
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parse_info.branch_info.kill = false;
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parse_info.branch_info.is_sync = false;
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parse_info.branch_info.is_brk = true;
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parse_info.end_address = offset;
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return ParseResult::ControlCaught;
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}
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case OpCode::Id::KIL: {
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parse_info.branch_info.condition;
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const auto pred_index = static_cast<u32>(instr.pred.pred_index);
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parse_info.branch_info.condition.predicate =
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GetPredicate(pred_index, instr.negate_pred != 0);
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if (parse_info.branch_info.condition.predicate == Pred::NeverExecute) {
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offset++;
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continue;
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}
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const ConditionCode cc = instr.flow_condition_code;
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parse_info.branch_info.condition.cc = cc;
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if (cc == ConditionCode::F) {
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offset++;
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continue;
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}
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parse_info.branch_info.address = exit_branch;
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parse_info.branch_info.kill = true;
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parse_info.branch_info.is_sync = false;
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parse_info.branch_info.is_brk = false;
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parse_info.end_address = offset;
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return ParseResult::ControlCaught;
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}
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case OpCode::Id::SSY: {
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const u32 target = offset + instr.bra.GetBranchTarget();
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insert_label(state, target);
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state.ssy_labels.emplace(offset, target);
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break;
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}
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case OpCode::Id::PBK: {
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const u32 target = offset + instr.bra.GetBranchTarget();
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insert_label(state, target);
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state.pbk_labels.emplace(offset, target);
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break;
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}
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default:
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break;
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}
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offset++;
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}
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parse_info.branch_info.kill = false;
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parse_info.branch_info.is_sync = false;
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parse_info.branch_info.is_brk = false;
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parse_info.end_address = offset - 1;
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return ParseResult::BlockEnd;
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}
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bool TryInspectAddress(CFGRebuildState& state) {
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if (state.inspect_queries.empty()) {
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return false;
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}
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u32 address = state.inspect_queries.front();
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state.inspect_queries.pop_front();
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auto search_result = TryGetBlock(state, address);
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BlockInfo* block_info;
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switch (search_result.first) {
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case BlockCollision::Found: {
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return true;
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break;
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}
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case BlockCollision::Inside: {
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// This case is the tricky one:
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// We need to Split the block in 2 sepprate blocks
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auto it = search_result.second;
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block_info = CreateBlockInfo(state, address, it->end);
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it->end = address - 1;
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block_info->branch = it->branch;
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BlockBranchInfo forward_branch{};
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forward_branch.address = address;
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it->branch = forward_branch;
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return true;
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break;
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}
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default:
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break;
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}
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ParseInfo parse_info;
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ParseResult parse_result = ParseCode(state, address, parse_info);
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if (parse_result == ParseResult::AbnormalFlow) {
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// if it's the end of the program, end it safely
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// if it's AbnormalFlow, we end it as false, ending the CFG reconstruction
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return false;
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}
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block_info = CreateBlockInfo(state, address, parse_info.end_address);
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block_info->branch = parse_info.branch_info;
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if (parse_info.branch_info.condition.IsUnconditional()) {
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return true;
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}
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u32 fallthrough_address = parse_info.end_address + 1;
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state.inspect_queries.push_front(fallthrough_address);
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return true;
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}
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bool ScanFlow(const ProgramCode& program_code, u32 program_size, u32 start_address,
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ShaderCharacteristics& result_out) {
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CFGRebuildState state{program_code, program_size};
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// Inspect Code and generate blocks
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state.labels.clear();
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state.labels.emplace(start_address);
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state.inspect_queries.push_back(start_address);
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while (!state.inspect_queries.empty()) {
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if (!TryInspectAddress(state)) {
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return false;
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}
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}
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std::sort(state.block_info.begin(), state.block_info.end(),
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[](const BlockInfo& a, const BlockInfo& b) -> bool { return a.start < b.start; });
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// Remove unvisited blocks
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result_out.blocks.clear();
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result_out.decompilable = false;
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result_out.start = start_address;
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result_out.end = start_address;
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for (auto& block : state.block_info) {
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ShaderBlock new_block{};
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new_block.start = block.start;
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new_block.end = block.end;
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new_block.branch.cond = block.branch.condition;
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new_block.branch.kills = block.branch.kill;
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new_block.branch.address = block.branch.address;
|
||
|
|
result_out.end = std::max(result_out.end, block.end);
|
||
|
|
result_out.blocks.push_back(new_block);
|
||
|
|
}
|
||
|
|
if (result_out.decompilable) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
auto back = result_out.blocks.begin();
|
||
|
|
auto next = std::next(back);
|
||
|
|
while (next != result_out.blocks.end()) {
|
||
|
|
if (state.labels.count(next->start) == 0 && next->start == back->end + 1) {
|
||
|
|
back->end = next->end;
|
||
|
|
next = result_out.blocks.erase(next);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
back = next;
|
||
|
|
next++;
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
} // namespace VideoCommon::Shader
|