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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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86
src/video_core/shader/decode.cpp
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@ -102,35 +102,71 @@ 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;
coverage_begin = shader_info.start;
coverage_end = shader_info.end;
if (shader_info.decompiled) {
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");
// we can't decompile it, fallback to standard method
auto info = ScanFlow(program_code, program_size, main_offset, settings);
auto& shader_info = *info;
coverage_begin = shader_info.start;
coverage_end = shader_info.end;
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)});
}
return;
break;
}
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.
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)});
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);
break;
}
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));
}
}