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4b6eb0c6e3
For overridable constants without explicit ID, replace the decoration with explicit ID to avoid ID changes impacted by stripped away variables. Bug: tint:1155, dawn:1137 Change-Id: I7d76c08952cfa870403ee2653411b2b6ee2af7b6 Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/69500 Reviewed-by: Ben Clayton <bclayton@google.com> Kokoro: Kokoro <noreply+kokoro@google.com> Commit-Queue: Shrek Shao <shrekshao@google.com>
120 lines
4.0 KiB
C++
120 lines
4.0 KiB
C++
// Copyright 2021 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "src/transform/single_entry_point.h"
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#include <unordered_set>
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#include <utility>
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#include "src/program_builder.h"
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#include "src/sem/function.h"
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#include "src/sem/variable.h"
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TINT_INSTANTIATE_TYPEINFO(tint::transform::SingleEntryPoint);
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TINT_INSTANTIATE_TYPEINFO(tint::transform::SingleEntryPoint::Config);
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namespace tint {
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namespace transform {
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SingleEntryPoint::SingleEntryPoint() = default;
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SingleEntryPoint::~SingleEntryPoint() = default;
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void SingleEntryPoint::Run(CloneContext& ctx, const DataMap& inputs, DataMap&) {
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auto* cfg = inputs.Get<Config>();
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if (cfg == nullptr) {
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ctx.dst->Diagnostics().add_error(
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diag::System::Transform,
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"missing transform data for " + std::string(TypeInfo().name));
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return;
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}
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// Find the target entry point.
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const ast::Function* entry_point = nullptr;
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for (auto* f : ctx.src->AST().Functions()) {
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if (!f->IsEntryPoint()) {
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continue;
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}
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if (ctx.src->Symbols().NameFor(f->symbol) == cfg->entry_point_name) {
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entry_point = f;
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break;
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}
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}
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if (entry_point == nullptr) {
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ctx.dst->Diagnostics().add_error(
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diag::System::Transform,
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"entry point '" + cfg->entry_point_name + "' not found");
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return;
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}
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auto& sem = ctx.src->Sem();
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// Build set of referenced module-scope variables for faster lookups later.
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std::unordered_set<const ast::Variable*> referenced_vars;
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for (auto* var : sem.Get(entry_point)->TransitivelyReferencedGlobals()) {
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referenced_vars.emplace(var->Declaration());
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}
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// Clone any module-scope variables, types, and functions that are statically
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// referenced by the target entry point.
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for (auto* decl : ctx.src->AST().GlobalDeclarations()) {
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if (auto* ty = decl->As<ast::TypeDecl>()) {
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// TODO(jrprice): Strip unused types.
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ctx.dst->AST().AddTypeDecl(ctx.Clone(ty));
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} else if (auto* var = decl->As<ast::Variable>()) {
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if (referenced_vars.count(var)) {
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if (var->is_const) {
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if (auto* deco = ast::GetDecoration<ast::OverrideDecoration>(
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var->decorations)) {
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// It is an overridable constant
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if (!deco->has_value) {
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// If the decoration doesn't have numeric ID specified explicitly
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// Make their ids explicitly assigned in the decoration so that
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// they won't be affected by other stripped away constants
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auto* global = sem.Get(var)->As<sem::GlobalVariable>();
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const auto* new_deco =
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ctx.dst->Override(deco->source, global->ConstantId());
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ctx.Replace(deco, new_deco);
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}
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}
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}
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ctx.dst->AST().AddGlobalVariable(ctx.Clone(var));
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}
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} else if (auto* func = decl->As<ast::Function>()) {
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if (sem.Get(func)->HasAncestorEntryPoint(entry_point->symbol)) {
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ctx.dst->AST().AddFunction(ctx.Clone(func));
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}
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} else {
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TINT_UNREACHABLE(Transform, ctx.dst->Diagnostics())
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<< "unhandled global declaration: " << decl->TypeInfo().name;
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return;
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}
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}
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// Clone the entry point.
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ctx.dst->AST().AddFunction(ctx.Clone(entry_point));
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}
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SingleEntryPoint::Config::Config(std::string entry_point)
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: entry_point_name(entry_point) {}
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SingleEntryPoint::Config::Config(const Config&) = default;
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SingleEntryPoint::Config::~Config() = default;
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SingleEntryPoint::Config& SingleEntryPoint::Config::operator=(const Config&) =
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default;
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} // namespace transform
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} // namespace tint
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