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