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vk_shader_decompiler: Implement labels tree and flow

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This commit is contained in:
ReinUsesLisp 2019-03-14 02:27:06 -03:00
parent 13aa664f3f
commit ca51f99840
1 changed files with 71 additions and 0 deletions
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71
src/video_core/renderer_vulkan/vk_shader_decompiler.cpp
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@ -86,6 +86,7 @@ public:
void Decompile() {
AllocateBindings();
AllocateLabels();
DeclareVertex();
DeclareGeometry();
@ -100,7 +101,63 @@ public:
DeclareGlobalBuffers();
DeclareSamplers();
execute_function =
Emit(OpFunction(t_void, spv::FunctionControlMask::Inline, TypeFunction(t_void)));
Emit(OpLabel());
const u32 first_address = ir.GetBasicBlocks().begin()->first;
const Id loop_label = OpLabel("loop");
const Id merge_label = OpLabel("merge");
const Id dummy_label = OpLabel();
const Id jump_label = OpLabel();
continue_label = OpLabel("continue");
std::vector<Sirit::Literal> literals;
std::vector<Id> branch_labels;
for (const auto& pair : labels) {
const auto [literal, label] = pair;
literals.push_back(literal);
branch_labels.push_back(label);
}
// TODO(Rodrigo): 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;
const Id flow_stack_type = TypeArray(t_uint, Constant(t_uint, FLOW_STACK_SIZE));
jmp_to = Emit(OpVariable(TypePointer(spv::StorageClass::Function, t_uint),
spv::StorageClass::Function, Constant(t_uint, first_address)));
flow_stack = Emit(OpVariable(TypePointer(spv::StorageClass::Function, flow_stack_type),
spv::StorageClass::Function, ConstantNull(flow_stack_type)));
flow_stack_top =
Emit(OpVariable(t_func_uint, spv::StorageClass::Function, Constant(t_uint, 0)));
Name(jmp_to, "jmp_to");
Name(flow_stack, "flow_stack");
Name(flow_stack_top, "flow_stack_top");
Emit(OpBranch(loop_label));
Emit(loop_label);
Emit(OpLoopMerge(merge_label, continue_label, spv::LoopControlMask::Unroll));
Emit(OpBranch(dummy_label));
Emit(dummy_label);
const Id default_branch = OpLabel();
const Id jmp_to_load = Emit(OpLoad(t_uint, jmp_to));
Emit(OpSelectionMerge(jump_label, spv::SelectionControlMask::MaskNone));
Emit(OpSwitch(jmp_to_load, default_branch, literals, branch_labels));
Emit(default_branch);
Emit(OpReturn());
UNIMPLEMENTED();
Emit(jump_label);
Emit(OpBranch(continue_label));
Emit(continue_label);
Emit(OpBranch(loop_label));
Emit(merge_label);
Emit(OpReturn());
Emit(OpFunctionEnd());
}
ShaderEntries GetShaderEntries() const {
@ -148,6 +205,13 @@ private:
"Stage binding stride is too small");
}
void AllocateLabels() {
for (const auto& pair : ir.GetBasicBlocks()) {
const u32 address = pair.first;
labels.emplace(address, OpLabel(fmt::format("label_0x{:x}", address)));
}
}
void DeclareVertex() {
if (stage != ShaderStage::Vertex)
return;
@ -432,6 +496,8 @@ private:
const Id t_prv_bool = Name(TypePointer(spv::StorageClass::Private, t_bool), "prv_bool");
const Id t_prv_float = Name(TypePointer(spv::StorageClass::Private, t_float), "prv_float");
const Id t_func_uint = Name(TypePointer(spv::StorageClass::Function, t_uint), "func_uint");
const Id t_in_bool = Name(TypePointer(spv::StorageClass::Input, t_bool), "in_bool");
const Id t_in_uint = Name(TypePointer(spv::StorageClass::Input, t_uint), "in_uint");
const Id t_in_float = Name(TypePointer(spv::StorageClass::Input, t_float), "in_float");
@ -488,6 +554,11 @@ private:
u32 samplers_base_binding{};
Id execute_function{};
Id jmp_to{};
Id flow_stack_top{};
Id flow_stack{};
Id continue_label{};
std::map<u32, Id> labels;
};
DecompilerResult Decompile(const VideoCommon::Shader::ShaderIR& ir, Maxwell::ShaderStage stage) {