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Shader_Ir: Refactor Decompilation process and allow multiple decompilation modes.

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This commit is contained in:
Fernando Sahmkow 2019-08-16 16:25:02 -04:00 committed by FernandoS27
parent 38fc995f6c
commit 47e4f6a52c
15 changed files with 338 additions and 82 deletions
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2
CMakeModules/GenerateSCMRev.cmake
View File

@ -87,6 +87,8 @@ set(HASH_FILES
"${VIDEO_CORE}/shader/ast.h"
"${VIDEO_CORE}/shader/control_flow.cpp"
"${VIDEO_CORE}/shader/control_flow.h"
"${VIDEO_CORE}/shader/compiler_settings.cpp"
"${VIDEO_CORE}/shader/compiler_settings.h"
"${VIDEO_CORE}/shader/decode.cpp"
"${VIDEO_CORE}/shader/expr.cpp"
"${VIDEO_CORE}/shader/expr.h"

2
src/common/CMakeLists.txt
View File

@ -64,6 +64,8 @@ add_custom_command(OUTPUT scm_rev.cpp
"${VIDEO_CORE}/shader/ast.h"
"${VIDEO_CORE}/shader/control_flow.cpp"
"${VIDEO_CORE}/shader/control_flow.h"
"${VIDEO_CORE}/shader/compiler_settings.cpp"
"${VIDEO_CORE}/shader/compiler_settings.h"
"${VIDEO_CORE}/shader/decode.cpp"
"${VIDEO_CORE}/shader/expr.cpp"
"${VIDEO_CORE}/shader/expr.h"

2
src/video_core/CMakeLists.txt
View File

@ -109,6 +109,8 @@ add_library(video_core STATIC
shader/ast.h
shader/control_flow.cpp
shader/control_flow.h
shader/compiler_settings.cpp
shader/compiler_settings.h
shader/decode.cpp
shader/expr.cpp
shader/expr.h

2
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
View File

@ -352,10 +352,12 @@ public:
// TODO(Subv): Figure out the actual depth of the flow stack, for now it seems
// unlikely that shaders will use 20 nested SSYs and PBKs.
constexpr u32 FLOW_STACK_SIZE = 20;
if (!ir.IsFlowStackDisabled()) {
for (const auto stack : std::array{MetaStackClass::Ssy, MetaStackClass::Pbk}) {
code.AddLine("uint {}[{}];", FlowStackName(stack), FLOW_STACK_SIZE);
code.AddLine("uint {} = 0u;", FlowStackTopName(stack));
}
}
code.AddLine("while (true) {{");
++code.scope;

25
src/video_core/renderer_opengl/gl_shader_gen.cpp
View File

@ -11,6 +11,8 @@
namespace OpenGL::GLShader {
using Tegra::Engines::Maxwell3D;
using VideoCommon::Shader::CompileDepth;
using VideoCommon::Shader::CompilerSettings;
using VideoCommon::Shader::ProgramCode;
using VideoCommon::Shader::ShaderIR;
@ -31,13 +33,17 @@ layout (std140, binding = EMULATION_UBO_BINDING) uniform vs_config {
)";
const ShaderIR program_ir(setup.program.code, PROGRAM_OFFSET, setup.program.size_a);
CompilerSettings settings;
settings.depth = CompileDepth::NoFlowStack;
const ShaderIR program_ir(setup.program.code, PROGRAM_OFFSET, setup.program.size_a, settings);
const auto stage = setup.IsDualProgram() ? ProgramType::VertexA : ProgramType::VertexB;
ProgramResult program = Decompile(device, program_ir, stage, "vertex");
out += program.first;
if (setup.IsDualProgram()) {
const ShaderIR program_ir_b(setup.program.code_b, PROGRAM_OFFSET, setup.program.size_b);
const ShaderIR program_ir_b(setup.program.code_b, PROGRAM_OFFSET, setup.program.size_b,
settings);
ProgramResult program_b = Decompile(device, program_ir_b, ProgramType::VertexB, "vertex_b");
out += program_b.first;
}
@ -80,7 +86,10 @@ layout (std140, binding = EMULATION_UBO_BINDING) uniform gs_config {
)";
const ShaderIR program_ir(setup.program.code, PROGRAM_OFFSET, setup.program.size_a);
CompilerSettings settings;
settings.depth = CompileDepth::NoFlowStack;
const ShaderIR program_ir(setup.program.code, PROGRAM_OFFSET, setup.program.size_a, settings);
ProgramResult program = Decompile(device, program_ir, ProgramType::Geometry, "geometry");
out += program.first;
@ -114,7 +123,10 @@ layout (std140, binding = EMULATION_UBO_BINDING) uniform fs_config {
};
)";
const ShaderIR program_ir(setup.program.code, PROGRAM_OFFSET, setup.program.size_a);
CompilerSettings settings;
settings.depth = CompileDepth::NoFlowStack;
const ShaderIR program_ir(setup.program.code, PROGRAM_OFFSET, setup.program.size_a, settings);
ProgramResult program = Decompile(device, program_ir, ProgramType::Fragment, "fragment");
out += program.first;
@ -133,7 +145,10 @@ ProgramResult GenerateComputeShader(const Device& device, const ShaderSetup& set
std::string out = "// Shader Unique Id: CS" + id + "\n\n";
out += GetCommonDeclarations();
const ShaderIR program_ir(setup.program.code, COMPUTE_OFFSET, setup.program.size_a);
CompilerSettings settings;
settings.depth = CompileDepth::NoFlowStack;
const ShaderIR program_ir(setup.program.code, COMPUTE_OFFSET, setup.program.size_a, settings);
ProgramResult program = Decompile(device, program_ir, ProgramType::Compute, "compute");
out += program.first;

90
src/video_core/shader/ast.cpp
View File

@ -363,7 +363,7 @@ std::string ASTManager::Print() {
return printer.GetResult();
}
ASTManager::ASTManager() = default;
ASTManager::ASTManager(bool full_decompile) : full_decompile{full_decompile} {};
ASTManager::~ASTManager() {
Clear();
@ -383,6 +383,7 @@ ASTManager::ASTManager(ASTManager&& other)
}
ASTManager& ASTManager::operator=(ASTManager&& other) {
full_decompile = other.full_decompile;
labels_map = std::move(other.labels_map);
labels_count = other.labels_count;
gotos = std::move(other.gotos);
@ -434,6 +435,13 @@ void ASTManager::Decompile() {
ASTNode goto_node = *it;
u32 label_index = goto_node->GetGotoLabel();
ASTNode label = labels[label_index];
if (!full_decompile) {
// We only decompile backward jumps
if (!IsBackwardsJump(goto_node, label)) {
it++;
continue;
}
}
if (IndirectlyRelated(goto_node, label)) {
while (!DirectlyRelated(goto_node, label)) {
MoveOutward(goto_node);
@ -469,11 +477,91 @@ void ASTManager::Decompile() {
}
it++;
}
if (full_decompile) {
for (ASTNode label : labels) {
auto& manager = label->GetManager();
manager.Remove(label);
}
labels.clear();
} else {
auto it = labels.begin();
while (it != labels.end()) {
bool can_remove = true;
ASTNode label = *it;
for (ASTNode goto_node : gotos) {
u32 label_index = goto_node->GetGotoLabel();
ASTNode glabel = labels[label_index];
if (glabel == label) {
can_remove = false;
break;
}
}
if (can_remove) {
auto& manager = label->GetManager();
manager.Remove(label);
labels.erase(it);
}
}
}
}
bool ASTManager::IsBackwardsJump(ASTNode goto_node, ASTNode label_node) const {
u32 goto_level = goto_node->GetLevel();
u32 label_level = label_node->GetLevel();
while (goto_level > label_level) {
goto_level--;
goto_node = goto_node->GetParent();
}
while (label_level > goto_level) {
label_level--;
label_node = label_node->GetParent();
}
while (goto_node->GetParent() != label_node->GetParent()) {
goto_node = goto_node->GetParent();
label_node = label_node->GetParent();
}
ASTNode current = goto_node->GetPrevious();
while (current) {
if (current == label_node) {
return true;
}
current = current->GetPrevious();
}
return false;
}
ASTNode CommonParent(ASTNode first, ASTNode second) {
if (first->GetParent() == second->GetParent()) {
return first->GetParent();
}
u32 first_level = first->GetLevel();
u32 second_level = second->GetLevel();
u32 min_level;
u32 max_level;
ASTNode max;
ASTNode min;
if (first_level > second_level) {
min_level = second_level;
min = second;
max_level = first_level;
max = first;
} else {
min_level = first_level;
min = first;
max_level = second_level;
max = second;
}
while (max_level > min_level) {
max_level--;
max = max->GetParent();
}
while (min->GetParent() != max->GetParent()) {
min = min->GetParent();
max = max->GetParent();
}
return min->GetParent();
}
bool ASTManager::IndirectlyRelated(ASTNode first, ASTNode second) {

18
src/video_core/shader/ast.h
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@ -274,7 +274,7 @@ private:
class ASTManager final {
public:
ASTManager();
ASTManager(bool full_decompile);
~ASTManager();
ASTManager(const ASTManager& o) = delete;
@ -304,7 +304,18 @@ public:
void SanityCheck();
bool IsFullyDecompiled() const {
if (full_decompile) {
return gotos.size() == 0;
} else {
for (ASTNode goto_node : gotos) {
u32 label_index = goto_node->GetGotoLabel();
ASTNode glabel = labels[label_index];
if (IsBackwardsJump(goto_node, glabel)) {
return false;
}
}
return true;
}
}
ASTNode GetProgram() const {
@ -318,6 +329,10 @@ public:
}
private:
bool IsBackwardsJump(ASTNode goto_node, ASTNode label_node) const;
ASTNode CommonParent(ASTNode first, ASTNode second);
bool IndirectlyRelated(ASTNode first, ASTNode second);
bool DirectlyRelated(ASTNode first, ASTNode second);
@ -334,6 +349,7 @@ private:
return new_var;
}
bool full_decompile{};
std::unordered_map<u32, u32> labels_map{};
u32 labels_count{};
std::vector<ASTNode> labels{};

26
src/video_core/shader/compiler_settings.cpp Normal file
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@ -0,0 +1,26 @@
// Copyright 2019 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "video_core/shader/compiler_settings.h"
namespace VideoCommon::Shader {
std::string CompileDepthAsString(const CompileDepth cd) {
switch (cd) {
case CompileDepth::BruteForce:
return "Brute Force Compile";
case CompileDepth::FlowStack:
return "Simple Flow Stack Mode";
case CompileDepth::NoFlowStack:
return "Remove Flow Stack";
case CompileDepth::DecompileBackwards:
return "Decompile Backward Jumps";
case CompileDepth::FullDecompile:
return "Full Decompilation";
default:
return "Unknown Compiler Process";
}
}
} // namespace VideoCommon::Shader

25
src/video_core/shader/compiler_settings.h Normal file
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@ -0,0 +1,25 @@
// Copyright 2019 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include "video_core/engines/shader_bytecode.h"
namespace VideoCommon::Shader {
enum class CompileDepth : u32 {
BruteForce = 0,
FlowStack = 1,
NoFlowStack = 2,
DecompileBackwards = 3,
FullDecompile = 4,
};
std::string CompileDepthAsString(CompileDepth cd);
struct CompilerSettings {
CompileDepth depth;
};
} // namespace VideoCommon::Shader

72
src/video_core/shader/control_flow.cpp
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@ -57,8 +57,8 @@ struct BlockInfo {
struct CFGRebuildState {
explicit CFGRebuildState(const ProgramCode& program_code, const std::size_t program_size,
const u32 start, ASTManager& manager)
: program_code{program_code}, program_size{program_size}, start{start}, manager{manager} {}
const u32 start)
: program_code{program_code}, program_size{program_size}, start{start} {}
u32 start{};
std::vector<BlockInfo> block_info{};
@ -71,7 +71,7 @@ struct CFGRebuildState {
std::unordered_map<u32, BlockStack> stacks{};
const ProgramCode& program_code;
const std::size_t program_size;
ASTManager& manager;
ASTManager* manager;
};
enum class BlockCollision : u32 { None, Found, Inside };
@ -456,67 +456,91 @@ void InsertBranch(ASTManager& mm, const BlockBranchInfo& branch) {
}
void DecompileShader(CFGRebuildState& state) {
state.manager.Init();
state.manager->Init();
for (auto label : state.labels) {
state.manager.DeclareLabel(label);
state.manager->DeclareLabel(label);
}
for (auto& block : state.block_info) {
if (state.labels.count(block.start) != 0) {
state.manager.InsertLabel(block.start);
state.manager->InsertLabel(block.start);
}
u32 end = block.branch.ignore ? block.end + 1 : block.end;
state.manager.InsertBlock(block.start, end);
state.manager->InsertBlock(block.start, end);
if (!block.branch.ignore) {
InsertBranch(state.manager, block.branch);
InsertBranch(*state.manager, block.branch);
}
}
// state.manager.ShowCurrentState("Before Decompiling");
state.manager.Decompile();
// state.manager.ShowCurrentState("After Decompiling");
state.manager->Decompile();
}
std::unique_ptr<ShaderCharacteristics> ScanFlow(const ProgramCode& program_code, u32 program_size,
u32 start_address, ASTManager& manager) {
CFGRebuildState state{program_code, program_size, start_address, manager};
u32 start_address,
const CompilerSettings& settings) {
auto result_out = std::make_unique<ShaderCharacteristics>();
if (settings.depth == CompileDepth::BruteForce) {
result_out->settings.depth = CompileDepth::BruteForce;
return std::move(result_out);
}
CFGRebuildState state{program_code, program_size, start_address};
// Inspect Code and generate blocks
state.labels.clear();
state.labels.emplace(start_address);
state.inspect_queries.push_back(state.start);
while (!state.inspect_queries.empty()) {
if (!TryInspectAddress(state)) {
return {};
result_out->settings.depth = CompileDepth::BruteForce;
return std::move(result_out);
}
}
bool use_flow_stack = true;
bool decompiled = false;
if (settings.depth != CompileDepth::FlowStack) {
// Decompile Stacks
state.queries.push_back(Query{state.start, {}, {}});
bool decompiled = true;
decompiled = true;
while (!state.queries.empty()) {
if (!TryQuery(state)) {
decompiled = false;
break;
}
}
}
use_flow_stack = !decompiled;
// Sort and organize results
std::sort(state.block_info.begin(), state.block_info.end(),
[](const BlockInfo& a, const BlockInfo& b) -> bool { return a.start < b.start; });
if (decompiled) {
if (decompiled && settings.depth != CompileDepth::NoFlowStack) {
ASTManager manager{settings.depth != CompileDepth::DecompileBackwards};
state.manager = &manager;
DecompileShader(state);
decompiled = state.manager.IsFullyDecompiled();
decompiled = state.manager->IsFullyDecompiled();
if (!decompiled) {
if (settings.depth == CompileDepth::FullDecompile) {
LOG_CRITICAL(HW_GPU, "Failed to remove all the gotos!:");
state.manager.ShowCurrentState("Of Shader");
state.manager.Clear();
}
} else {
LOG_CRITICAL(HW_GPU, "Failed to remove all backward gotos!:");
}
state.manager->ShowCurrentState("Of Shader");
state.manager->Clear();
} else {
auto result_out = std::make_unique<ShaderCharacteristics>();
result_out->decompiled = decompiled;
result_out->start = start_address;
if (decompiled) {
result_out->settings.depth = settings.depth;
result_out->manager = std::move(manager);
result_out->end = state.block_info.back().end + 1;
return std::move(result_out);
}
}
result_out->start = start_address;
result_out->settings.depth =
use_flow_stack ? CompileDepth::FlowStack : CompileDepth::NoFlowStack;
result_out->blocks.clear();
for (auto& block : state.block_info) {
ShaderBlock new_block{};
new_block.start = block.start;
@ -530,6 +554,10 @@ std::unique_ptr<ShaderCharacteristics> ScanFlow(const ProgramCode& program_code,
result_out->end = std::max(result_out->end, block.end);
result_out->blocks.push_back(new_block);
}
if (!use_flow_stack) {
result_out->labels = std::move(state.labels);
return std::move(result_out);
}
auto back = result_out->blocks.begin();
auto next = std::next(back);
while (next != result_out->blocks.end()) {

10
src/video_core/shader/control_flow.h
View File

@ -9,8 +9,9 @@
#include <set>
#include "video_core/engines/shader_bytecode.h"
#include "video_core/shader/shader_ir.h"
#include "video_core/shader/ast.h"
#include "video_core/shader/compiler_settings.h"
#include "video_core/shader/shader_ir.h"
namespace VideoCommon::Shader {
@ -68,12 +69,15 @@ struct ShaderBlock {
struct ShaderCharacteristics {
std::list<ShaderBlock> blocks{};
bool decompiled{};
std::set<u32> labels{};
u32 start{};
u32 end{};
ASTManager manager{true};
CompilerSettings settings{};
};
std::unique_ptr<ShaderCharacteristics> ScanFlow(const ProgramCode& program_code, u32 program_size,
u32 start_address, ASTManager& manager);
u32 start_address,
const CompilerSettings& settings);
} // namespace VideoCommon::Shader

70
src/video_core/shader/decode.cpp
View File

@ -102,36 +102,72 @@ void ShaderIR::Decode() {
std::memcpy(&header, program_code.data(), sizeof(Tegra::Shader::Header));
decompiled = false;
const auto info =
ScanFlow(program_code, program_size, main_offset, program_manager);
if (info) {
const auto& shader_info = *info;
auto info = ScanFlow(program_code, program_size, main_offset, settings);
auto& shader_info = *info;
coverage_begin = shader_info.start;
coverage_end = shader_info.end;
if (shader_info.decompiled) {
switch (shader_info.settings.depth) {
case CompileDepth::FlowStack: {
for (const auto& block : shader_info.blocks) {
basic_blocks.insert({block.start, DecodeRange(block.start, block.end + 1)});
}
break;
}
case CompileDepth::NoFlowStack: {
disable_flow_stack = true;
const auto insert_block = [this](NodeBlock& nodes, u32 label) {
if (label == static_cast<u32>(exit_branch)) {
return;
}
basic_blocks.insert({label, nodes});
};
const auto& blocks = shader_info.blocks;
NodeBlock current_block;
u32 current_label = static_cast<u32>(exit_branch);
for (auto& block : blocks) {
if (shader_info.labels.count(block.start) != 0) {
insert_block(current_block, current_label);
current_block.clear();
current_label = block.start;
}
if (!block.ignore_branch) {
DecodeRangeInner(current_block, block.start, block.end);
InsertControlFlow(current_block, block);
} else {
DecodeRangeInner(current_block, block.start, block.end + 1);
}
}
insert_block(current_block, current_label);
break;
}
case CompileDepth::DecompileBackwards:
case CompileDepth::FullDecompile: {
program_manager = std::move(shader_info.manager);
disable_flow_stack = true;
decompiled = true;
ASTDecoder decoder{*this};
ASTNode program = GetASTProgram();
decoder.Visit(program);
return;
break;
}
LOG_WARNING(HW_GPU, "Flow Stack Removing Failed! Falling back to old method");
// we can't decompile it, fallback to standard method
for (const auto& block : shader_info.blocks) {
basic_blocks.insert({block.start, DecodeRange(block.start, block.end + 1)});
}
return;
}
LOG_WARNING(HW_GPU, "Flow Analysis Failed! Falling back to brute force compiling");
// Now we need to deal with an undecompilable shader. We need to brute force
// a shader that captures every position.
default:
LOG_CRITICAL(HW_GPU, "Unknown decompilation mode!");
[[fallthrough]];
case CompileDepth::BruteForce: {
coverage_begin = main_offset;
const u32 shader_end = static_cast<u32>(program_size / sizeof(u64));
coverage_end = shader_end;
for (u32 label = main_offset; label < shader_end; label++) {
basic_blocks.insert({label, DecodeRange(label, label + 1)});
}
break;
}
}
if (settings.depth != shader_info.settings.depth) {
LOG_WARNING(
HW_GPU, "Decompiling to this setting \"{}\" failed, downgrading to this setting \"{}\"",
CompileDepthAsString(settings.depth), CompileDepthAsString(shader_info.settings.depth));
}
}
NodeBlock ShaderIR::DecodeRange(u32 begin, u32 end) {

8
src/video_core/shader/decode/other.cpp
View File

@ -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 (decompiled) {
if (disable_flow_stack) {
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 (decompiled) {
if (disable_flow_stack) {
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 (decompiled) {
if (disable_flow_stack) {
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 (decompiled) {
if (disable_flow_stack) {
break;
}

6
src/video_core/shader/shader_ir.cpp
View File

@ -22,8 +22,10 @@ using Tegra::Shader::PredCondition;
using Tegra::Shader::PredOperation;
using Tegra::Shader::Register;
ShaderIR::ShaderIR(const ProgramCode& program_code, u32 main_offset, const std::size_t size)
: program_code{program_code}, main_offset{main_offset}, program_size{size}, program_manager{} {
ShaderIR::ShaderIR(const ProgramCode& program_code, u32 main_offset, const std::size_t size,
CompilerSettings settings)
: program_code{program_code}, main_offset{main_offset}, program_size{size}, basic_blocks{},
program_manager{true}, settings{settings} {
Decode();
}

10
src/video_core/shader/shader_ir.h
View File

@ -16,6 +16,7 @@
#include "video_core/engines/shader_bytecode.h"
#include "video_core/engines/shader_header.h"
#include "video_core/shader/ast.h"
#include "video_core/shader/compiler_settings.h"
#include "video_core/shader/node.h"
namespace VideoCommon::Shader {
@ -65,7 +66,8 @@ struct GlobalMemoryUsage {
class ShaderIR final {
public:
explicit ShaderIR(const ProgramCode& program_code, u32 main_offset, std::size_t size);
explicit ShaderIR(const ProgramCode& program_code, u32 main_offset, std::size_t size,
CompilerSettings settings);
~ShaderIR();
const std::map<u32, NodeBlock>& GetBasicBlocks() const {
@ -141,6 +143,10 @@ public:
return header;
}
bool IsFlowStackDisabled() const {
return disable_flow_stack;
}
bool IsDecompiled() const {
return decompiled;
}
@ -368,6 +374,7 @@ private:
const u32 main_offset;
const std::size_t program_size;
bool decompiled{};
bool disable_flow_stack{};
u32 coverage_begin{};
u32 coverage_end{};
@ -375,6 +382,7 @@ private:
std::map<u32, NodeBlock> basic_blocks;
NodeBlock global_code;
ASTManager program_manager;
CompilerSettings settings{};
std::set<u32> used_registers;
std::set<Tegra::Shader::Pred> used_predicates;