[SYCL] Move module splitting functionality from sycl-post-link to SYCLLowerIR

llvm/tools/sycl-post-link/ModuleSplitter.h → llvm/include/llvm/SYCLLowerIR/ModuleSplitter.h

@@ -10,14 +10,16 @@
 // of the split is new modules containing corresponding callgraph.
 //===----------------------------------------------------------------------===//
 
-#pragma once
+#ifndef LLVM_SYCLLOWERIR_MODULE_SPLITTER_H
+#define LLVM_SYCLLOWERIR_MODULE_SPLITTER_H
 
 #include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/IR/Function.h"
 #include "llvm/Support/Error.h"
 
 #include <memory>
+#include <string>
 #include <vector>
 
 namespace llvm {
@@ -229,8 +231,8 @@ class ModuleSplitterBase {
   // For device global variables with the 'device_image_scope' property,
   // the function checks that there are no usages of a single device global
   // variable from kernels grouped to different modules. Otherwise, an error is
-  // issued and the tool is aborted.
-  void verifyNoCrossModuleDeviceGlobalUsage();
+  // returned.
+  Error verifyNoCrossModuleDeviceGlobalUsage();
 
   virtual ~ModuleSplitterBase() = default;
 
@@ -262,3 +264,5 @@ void dumpEntryPoints(const Module &M, bool OnlyKernelsAreEntryPoints = false,
 } // namespace module_split
 
 } // namespace llvm
+
+#endif // LLVM_SYCLLOWERIR_MODULE_SPLITTER_H

llvm/lib/SYCLLowerIR/CMakeLists.txt

@@ -62,6 +62,7 @@ add_llvm_component_library(LLVMSYCLLowerIR
   LowerInvokeSimd.cpp
   LowerWGLocalMemory.cpp
   LowerWGScope.cpp
+  ModuleSplitter.cpp
   MutatePrintfAddrspace.cpp
   SYCLAddOptLevelAttribute.cpp
   SYCLPropagateAspectsUsage.cpp

llvm/tools/sycl-post-link/ModuleSplitter.cpp → llvm/lib/SYCLLowerIR/ModuleSplitter.cpp

@@ -8,9 +8,7 @@
 // See comments in the header.
 //===----------------------------------------------------------------------===//
 
-#include "ModuleSplitter.h"
-#include "Support.h"
-
+#include "llvm/SYCLLowerIR/ModuleSplitter.h"
 #include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/StringExtras.h"
@@ -23,6 +21,7 @@
 #include "llvm/SYCLLowerIR/DeviceGlobals.h"
 #include "llvm/SYCLLowerIR/LowerInvokeSimd.h"
 #include "llvm/SYCLLowerIR/SYCLUtils.h"
+#include "llvm/Support/Error.h"
 #include "llvm/Transforms/IPO.h"
 #include "llvm/Transforms/IPO/GlobalDCE.h"
 #include "llvm/Transforms/IPO/StripDeadPrototypes.h"
@@ -426,14 +425,15 @@ class ModuleSplitter : public ModuleSplitterBase {
   DependencyGraph CG;
 };
 } // namespace
+
 namespace llvm {
 namespace module_split {
 
-void ModuleSplitterBase::verifyNoCrossModuleDeviceGlobalUsage() {
+Error ModuleSplitterBase::verifyNoCrossModuleDeviceGlobalUsage() {
   const Module &M = getInputModule();
   // Early exit if there is only one group
   if (Groups.size() < 2)
-    return;
+    return Error::success();
 
   // Reverse the EntryPointGroupMap to get a map of entry point -> module's name
   unsigned EntryPointNumber = 0;
@@ -451,19 +451,25 @@ void ModuleSplitterBase::verifyNoCrossModuleDeviceGlobalUsage() {
 
     std::optional<StringRef> VarEntryPointModule{};
     auto CheckEntryPointModule = [&VarEntryPointModule, &EntryPointModules,
-                                  &GV](const auto *F) {
+                                  &GV](const auto *F) -> Error {
       auto EntryPointModulesIt = EntryPointModules.find(F);
-      assert(EntryPointModulesIt != EntryPointModules.end() &&
-             "There is no group for an entry point");
+      if (EntryPointModulesIt == EntryPointModules.end())
+        return createStringError(inconvertibleErrorCode(),
+                                 "There is no group for an entry point");
+
       if (!VarEntryPointModule.has_value()) {
         VarEntryPointModule = EntryPointModulesIt->second;
-        return;
-      }
-      if (EntryPointModulesIt->second != *VarEntryPointModule) {
-        error("device_global variable '" + Twine(GV.getName()) +
-              "' with property \"device_image_scope\" is used in more "
-              "than one device image.");
+        return Error::success();
       }
+
+      if (EntryPointModulesIt->second != *VarEntryPointModule)
+        return createStringError(
+            inconvertibleErrorCode(),
+            "device_global variable '" + Twine(GV.getName()) +
+                "' with property \"device_image_scope\" is used in more "
+                "than one device image.");
+
+      return Error::success();
     };
 
     SmallSetVector<const User *, 32> Workqueue;
@@ -478,13 +484,18 @@ void ModuleSplitterBase::verifyNoCrossModuleDeviceGlobalUsage() {
         continue;
       }
       if (auto *F = dyn_cast<const Function>(U)) {
-        if (EntryPointModules.count(F))
-          CheckEntryPointModule(F);
+        if (EntryPointModules.count(F)) {
+          auto E = CheckEntryPointModule(F);
+          if (E)
+            return E;
+        }
       }
       for (auto *UU : U->users())
         Workqueue.insert(UU);
     }
   }
+
+  return Error::success();
 }
 
 #ifndef NDEBUG

llvm/tools/sycl-post-link/CMakeLists.txt

@@ -24,7 +24,6 @@ include_directories(
 
 add_llvm_tool(sycl-post-link
   sycl-post-link.cpp
-  ModuleSplitter.cpp
   SpecConstants.cpp
   SYCLDeviceLibReqMask.cpp
   SYCLKernelParamOptInfo.cpp

llvm/tools/sycl-post-link/SYCLDeviceRequirements.cpp

@@ -7,11 +7,11 @@
 //===----------------------------------------------------------------------===//
 
 #include "SYCLDeviceRequirements.h"
-#include "ModuleSplitter.h"
 
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/IR/Module.h"
+#include "llvm/SYCLLowerIR/ModuleSplitter.h"
 #include "llvm/Support/PropertySetIO.h"
 
 #include <set>

llvm/tools/sycl-post-link/sycl-post-link.cpp

@@ -13,7 +13,6 @@
 // - specialization constant intrinsic transformation
 //===----------------------------------------------------------------------===//
 
-#include "ModuleSplitter.h"
 #include "SYCLDeviceLibReqMask.h"
 #include "SYCLDeviceRequirements.h"
 #include "SYCLKernelParamOptInfo.h"
@@ -40,6 +39,7 @@
 #include "llvm/SYCLLowerIR/ESIMD/LowerESIMD.h"
 #include "llvm/SYCLLowerIR/HostPipes.h"
 #include "llvm/SYCLLowerIR/LowerInvokeSimd.h"
+#include "llvm/SYCLLowerIR/ModuleSplitter.h"
 #include "llvm/SYCLLowerIR/SYCLUtils.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileSystem.h"
@@ -1009,8 +1009,11 @@ processInputModule(std::unique_ptr<Module> M) {
   Modified |= SplitOccurred;
 
   // FIXME: this check is not performed for ESIMD splits
-  if (DeviceGlobals)
-    Splitter->verifyNoCrossModuleDeviceGlobalUsage();
+  if (DeviceGlobals) {
+    auto E = Splitter->verifyNoCrossModuleDeviceGlobalUsage();
+    if (E)
+      error(toString(std::move(E)));
+  }
 
   // It is important that we *DO NOT* preserve all the splits in memory at the
   // same time, because it leads to a huge RAM consumption by the tool on bigger