[llvm] [CodeGen] Expose the extensibility of PassConfig to plugins (PR #139059)
Stefan Gränitz via llvm-commits
llvm-commits at lists.llvm.org
Wed Jun 25 07:12:46 PDT 2025
================
@@ -0,0 +1,114 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Plugin/CodeGenTestPass.h"
+
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/CodeGen/TargetPassConfig.h"
+#include "llvm/Config/config.h"
+#include "llvm/IR/LegacyPassManager.h"
+#include "llvm/MC/TargetRegistry.h"
+#include "llvm/Support/DynamicLibrary.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/TargetSelect.h"
+#include "llvm/Target/TargetMachine.h"
+
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+namespace {
+void anchor() {}
+
+std::optional<std::string> libPath(const std::string &Name) {
+ const auto &Argvs = testing::internal::GetArgvs();
+ if (Argvs.size() <= 0)
+ return std::nullopt;
+ void *Ptr = (void *)(intptr_t)anchor;
+ std::string Path = sys::fs::getMainExecutable(Argvs[0].c_str(), Ptr);
+ SmallString<256> Buf{sys::path::parent_path(Path)};
+ sys::path::append(Buf, (Name + LLVM_PLUGIN_EXT).c_str());
+ return std::string(Buf.str());
+}
+} // namespace
+
+namespace llvm {
+class CGPluginTests : public testing::Test {
+protected:
+ static void SetUpTestCase() {
+ InitializeAllTargetMCs();
+ InitializeAllTargetInfos();
+ InitializeAllTargets();
+ }
+};
+} // namespace llvm
+
+TEST_F(CGPluginTests, LoadPlugin) {
+#if !defined(LLVM_ENABLE_PLUGINS)
+ // Skip the test if plugins are disabled.
+ GTEST_SKIP();
+#endif
+
+ auto PluginPath = libPath("CGTestPlugin");
+ ASSERT_TRUE(PluginPath.has_value());
+ ASSERT_NE("", PluginPath);
+
+ ASSERT_EQ(TargetMachine::TargetPassConfigCallbacks->size(), 0u);
+ std::string Error;
+ auto Library =
+ sys::DynamicLibrary::getPermanentLibrary(PluginPath->c_str(), &Error);
+ ASSERT_TRUE(Library.isValid()) << Error;
+ ASSERT_EQ(TargetMachine::TargetPassConfigCallbacks->size(), 1u);
+ TargetMachine::TargetPassConfigCallbacks->clear();
+}
+
+TEST_F(CGPluginTests, ExecuteCallback) {
+#if !defined(LLVM_ENABLE_PLUGINS)
+ // Skip the test if plugins are disabled.
+ GTEST_SKIP();
+#endif
+
+ volatile bool CallbackExecuted = false;
+ volatile bool MPassExecuted = false;
+
+ ASSERT_EQ(TargetMachine::TargetPassConfigCallbacks->size(), 0u);
+ TargetMachine::registerTargetPassConfigCallback(
+ [&](auto &TM, auto &PM, auto *TPC) {
+ CallbackExecuted = true;
+ TPC->insertPass(&GCLoweringID, &CodeGenTest::ID);
+ });
+ ASSERT_EQ(TargetMachine::TargetPassConfigCallbacks->size(), 1u);
+
+ CodeGenTest::RunCallback = [&] { MPassExecuted = true; };
+
+ TargetOptions Options;
+ std::unique_ptr<MCContext> MCC;
+ for (auto T : TargetRegistry::targets()) {
+ if (!T.hasTargetMachine())
+ continue;
+ Triple TT{T.getName(), "", ""};
+ auto *TM = T.createTargetMachine(TT, "", "", Options, std::nullopt,
+ std::nullopt, CodeGenOptLevel::Default);
+ ASSERT_TRUE(TM);
+
+ legacy::PassManager PM;
+ MCC.reset(new MCContext(TT, TM->getMCAsmInfo(), TM->getMCRegisterInfo(),
+ TM->getMCSubtargetInfo()));
+ auto *PtrMCC = MCC.get();
+ CallbackExecuted = false;
+ MPassExecuted = false;
+ if (TM->addPassesToEmitMC(PM, PtrMCC, outs()) == true)
+ continue;
+ ASSERT_TRUE(CallbackExecuted) << T.getName() << " callback failed";
+ ASSERT_TRUE(MPassExecuted) << T.getName() << " MachinePass failed";
+ }
+
+ TargetMachine::TargetPassConfigCallbacks->clear();
+}
----------------
weliveindetail wrote:
Interesting, yes for a codegen plugin this is actually a good end-to-end test!
https://github.com/llvm/llvm-project/pull/139059
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