| // Copyright 2021 The Tint Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "src/transform/single_entry_point.h" |
| |
| #include <unordered_set> |
| #include <utility> |
| |
| #include "src/program_builder.h" |
| #include "src/sem/function.h" |
| #include "src/sem/variable.h" |
| |
| TINT_INSTANTIATE_TYPEINFO(tint::transform::SingleEntryPoint); |
| TINT_INSTANTIATE_TYPEINFO(tint::transform::SingleEntryPoint::Config); |
| |
| namespace tint { |
| namespace transform { |
| |
| SingleEntryPoint::SingleEntryPoint() = default; |
| |
| SingleEntryPoint::~SingleEntryPoint() = default; |
| |
| void SingleEntryPoint::Run(CloneContext& ctx, const DataMap& inputs, DataMap&) { |
| auto* cfg = inputs.Get<Config>(); |
| if (cfg == nullptr) { |
| ctx.dst->Diagnostics().add_error( |
| diag::System::Transform, |
| "missing transform data for " + std::string(TypeInfo().name)); |
| |
| return; |
| } |
| |
| // Find the target entry point. |
| const ast::Function* entry_point = nullptr; |
| for (auto* f : ctx.src->AST().Functions()) { |
| if (!f->IsEntryPoint()) { |
| continue; |
| } |
| if (ctx.src->Symbols().NameFor(f->symbol) == cfg->entry_point_name) { |
| entry_point = f; |
| break; |
| } |
| } |
| if (entry_point == nullptr) { |
| ctx.dst->Diagnostics().add_error( |
| diag::System::Transform, |
| "entry point '" + cfg->entry_point_name + "' not found"); |
| return; |
| } |
| |
| auto& sem = ctx.src->Sem(); |
| |
| // Build set of referenced module-scope variables for faster lookups later. |
| std::unordered_set<const ast::Variable*> referenced_vars; |
| for (auto* var : sem.Get(entry_point)->TransitivelyReferencedGlobals()) { |
| referenced_vars.emplace(var->Declaration()); |
| } |
| |
| // Clone any module-scope variables, types, and functions that are statically |
| // referenced by the target entry point. |
| for (auto* decl : ctx.src->AST().GlobalDeclarations()) { |
| if (auto* ty = decl->As<ast::TypeDecl>()) { |
| // TODO(jrprice): Strip unused types. |
| ctx.dst->AST().AddTypeDecl(ctx.Clone(ty)); |
| } else if (auto* var = decl->As<ast::Variable>()) { |
| if (referenced_vars.count(var)) { |
| if (var->is_const) { |
| if (auto* deco = ast::GetDecoration<ast::OverrideDecoration>( |
| var->decorations)) { |
| // It is an overridable constant |
| if (!deco->has_value) { |
| // If the decoration doesn't have numeric ID specified explicitly |
| // Make their ids explicitly assigned in the decoration so that |
| // they won't be affected by other stripped away constants |
| auto* global = sem.Get(var)->As<sem::GlobalVariable>(); |
| const auto* new_deco = |
| ctx.dst->Override(deco->source, global->ConstantId()); |
| ctx.Replace(deco, new_deco); |
| } |
| } |
| } |
| ctx.dst->AST().AddGlobalVariable(ctx.Clone(var)); |
| } |
| } else if (auto* func = decl->As<ast::Function>()) { |
| if (sem.Get(func)->HasAncestorEntryPoint(entry_point->symbol)) { |
| ctx.dst->AST().AddFunction(ctx.Clone(func)); |
| } |
| } else { |
| TINT_UNREACHABLE(Transform, ctx.dst->Diagnostics()) |
| << "unhandled global declaration: " << decl->TypeInfo().name; |
| return; |
| } |
| } |
| |
| // Clone the entry point. |
| ctx.dst->AST().AddFunction(ctx.Clone(entry_point)); |
| } |
| |
| SingleEntryPoint::Config::Config(std::string entry_point) |
| : entry_point_name(entry_point) {} |
| |
| SingleEntryPoint::Config::Config(const Config&) = default; |
| SingleEntryPoint::Config::~Config() = default; |
| SingleEntryPoint::Config& SingleEntryPoint::Config::operator=(const Config&) = |
| default; |
| |
| } // namespace transform |
| } // namespace tint |