Add Workgroup size information to EntryPoint struct

BUG=tint:257

Change-Id: Iaf03bfaeb622b7315d65e46eccfe90244bced339
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/29420
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: dan sinclair <dsinclair@chromium.org>
Reviewed-by: dan sinclair <dsinclair@chromium.org>

src/inspector.cc

@@ -27,7 +27,9 @@ std::vector<EntryPoint> Inspector::GetEntryPoints() {
   std::vector<EntryPoint> result;
   for (const auto& func : module_.functions()) {
     if (func->IsEntryPoint()) {
-      result.push_back({func->name(), func->pipeline_stage()});
+      uint32_t x, y, z;
+      std::tie(x, y, z) = func->workgroup_size();
+      result.push_back({func->name(), func->pipeline_stage(), x, y, z});
     }
   }
 

src/inspector.h

@@ -25,11 +25,22 @@
 namespace tint {
 namespace inspector {
 
+/// Container of reflection data for an entry point in the shader.
 struct EntryPoint {
   /// The entry point name
   std::string name;
   /// The entry point stage
   ast::PipelineStage stage = ast::PipelineStage::kNone;
+  /// Elements of the workgroup size tuple
+  uint32_t workgroup_size_x;
+  uint32_t workgroup_size_y;
+  uint32_t workgroup_size_z;
+
+  /// @returns the size of the workgroup in {x,y,z} format
+  std::tuple<uint32_t, uint32_t, uint32_t> workgroup_size() {
+    return std::tuple<uint32_t, uint32_t, uint32_t>(
+        workgroup_size_x, workgroup_size_y, workgroup_size_z);
+  }
 };
 
 /// Extracts information from a module

src/inspector_test.cc

@@ -19,6 +19,7 @@
 #include "src/ast/pipeline_stage.h"
 #include "src/ast/stage_decoration.h"
 #include "src/ast/type/void_type.h"
+#include "src/ast/workgroup_decoration.h"
 #include "src/context.h"
 
 namespace tint {
@@ -38,9 +39,15 @@ class InspectorHelper {
     if (stage != ast::PipelineStage::kNone) {
       func->add_decoration(std::make_unique<ast::StageDecoration>(stage));
     }
+    last_function_ = func.get();
     mod()->AddFunction(std::move(func));
   }
 
+  void AddWorkGroupSizeToLastFunction(uint32_t x, uint32_t y, uint32_t z) {
+    last_function_->add_decoration(
+        std::make_unique<ast::WorkgroupDecoration>(x, y, z));
+  }
+
   ast::Module* mod() { return mod_.get(); }
   Inspector* inspector() { return inspector_.get(); }
 
@@ -48,6 +55,7 @@ class InspectorHelper {
   Context ctx_;
   std::unique_ptr<ast::Module> mod_;
   std::unique_ptr<Inspector> inspector_;
+  ast::Function* last_function_;
 };
 
 class InspectorTest : public InspectorHelper, public testing::Test {};
@@ -110,6 +118,34 @@ TEST_F(InspectorGetEntryPointTest, MixFunctionsAndEntryPoints) {
   EXPECT_EQ(ast::PipelineStage::kCompute, result[1].stage);
 }
 
+TEST_F(InspectorGetEntryPointTest, DefaultWorkgroupSize) {
+  AddFunction("foo", ast::PipelineStage::kVertex);
+
+  auto result = inspector()->GetEntryPoints();
+  ASSERT_FALSE(inspector()->has_error());
+
+  ASSERT_EQ(1u, result.size());
+  uint32_t x, y, z;
+  std::tie(x, y, z) = result[0].workgroup_size();
+  EXPECT_EQ(1u, x);
+  EXPECT_EQ(1u, y);
+  EXPECT_EQ(1u, z);
+}
+
+TEST_F(InspectorGetEntryPointTest, NonDefaultWorkgroupSize) {
+  AddFunction("foo", ast::PipelineStage::kCompute);
+  AddWorkGroupSizeToLastFunction(8u, 2u, 1u);
+  auto result = inspector()->GetEntryPoints();
+  ASSERT_FALSE(inspector()->has_error());
+
+  ASSERT_EQ(1u, result.size());
+  uint32_t x, y, z;
+  std::tie(x, y, z) = result[0].workgroup_size();
+  EXPECT_EQ(8u, x);
+  EXPECT_EQ(2u, y);
+  EXPECT_EQ(1u, z);
+}
+
 }  // namespace
 }  // namespace inspector
 }  // namespace tint