[CIR][LLVMLowering] Lower cir.objectsize (#545)

Lowers `cir.objectsize` to `llvm.objectsize`

Author: ghehg

clang/include/clang/CIR/Dialect/IR/CIROps.td

@@ -1775,31 +1775,24 @@ def GetGlobalOp : CIR_Op<"get_global",
     [Pure, DeclareOpInterfaceMethods<SymbolUserOpInterface>]> {
   let summary = "Get the address of a global variable";
   let description = [{
-    The `cir.get_global` operation retrieves the address pointing to a
-    named global variable. If the global variable is marked constant, writing
-    to the resulting address (such as through a `cir.store` operation) is
-    undefined. Resulting type must always be a `!cir.ptr<...>` type.
+     The `cir.get_global` operation retrieves the address pointing to a
+     named global variable. If the global variable is marked constant, writing
+     to the resulting address (such as through a `cir.store` operation) is
+     undefined. Resulting type must always be a `!cir.ptr<...>` type.
 
-    Addresses of thread local globals can only be retrieved if this operation
-    is marked `thread_local`, which indicates the address isn't constant.
+     Example:
 
-    Example:
-    ```mlir
-    %x = cir.get_global @foo : !cir.ptr<i32>
-    ...
-    %y = cir.get_global thread_local @batata : !cir.ptr<i32>
-    ```
+     ```mlir
+     %x = cir.get_global @foo : !cir.ptr<i32>
+     ```
   }];
 
-  let arguments = (ins FlatSymbolRefAttr:$name, UnitAttr:$tls);
+  let arguments = (ins FlatSymbolRefAttr:$name);
   let results = (outs Res<CIR_PointerType, "", []>:$addr);
 
   // FIXME: we should not be printing `cir.ptr` below, that should come
   // from the pointer type directly.
-  let assemblyFormat = [{
-    (`thread_local` $tls^)?
-    $name `:` `cir.ptr` type($addr) attr-dict
-  }];
+  let assemblyFormat = "$name `:` `cir.ptr` type($addr) attr-dict";
 
   // `GetGlobalOp` is fully verified by its traits.
   let hasVerifier = 0;

clang/lib/CIR/CodeGen/CIRGenBuilder.h

@@ -697,11 +697,9 @@ class CIRGenBuilderTy : public CIRBaseBuilderTy {
     return create<mlir::cir::GlobalOp>(loc, uniqueName, type, isConst, linkage);
   }
 
-  mlir::Value createGetGlobal(mlir::cir::GlobalOp global,
-                              bool threadLocal = false) {
-    return create<mlir::cir::GetGlobalOp>(global.getLoc(),
-                                          getPointerTo(global.getSymType()),
-                                          global.getName(), threadLocal);
+  mlir::Value createGetGlobal(mlir::cir::GlobalOp global) {
+    return create<mlir::cir::GetGlobalOp>(
+        global.getLoc(), getPointerTo(global.getSymType()), global.getName());
   }
 
   mlir::Value createGetBitfield(mlir::Location loc, mlir::Type resultType,

clang/lib/CIR/CodeGen/CIRGenExpr.cpp

@@ -719,10 +719,11 @@ static LValue buildGlobalVarDeclLValue(CIRGenFunction &CGF, const Expr *E,
   if (CGF.getLangOpts().OpenMP)
     llvm_unreachable("not implemented");
 
-  // Traditional LLVM codegen handles thread local separately, CIR handles
-  // as part of getAddrOfGlobalVar.
   auto V = CGF.CGM.getAddrOfGlobalVar(VD);
 
+  if (VD->getTLSKind() != VarDecl::TLS_None)
+    llvm_unreachable("NYI");
+
   auto RealVarTy = CGF.getTypes().convertTypeForMem(VD->getType());
   auto realPtrTy = CGF.getBuilder().getPointerTo(RealVarTy);
   if (realPtrTy != V.getType())

clang/lib/CIR/CodeGen/CIRGenModule.cpp

@@ -837,12 +837,11 @@ mlir::Value CIRGenModule::getAddrOfGlobalVar(const VarDecl *D, mlir::Type Ty,
   if (!Ty)
     Ty = getTypes().convertTypeForMem(ASTTy);
 
-  bool tlsAccess = D->getTLSKind() != VarDecl::TLS_None;
   auto g = buildGlobal(D, Ty, IsForDefinition);
   auto ptrTy =
       mlir::cir::PointerType::get(builder.getContext(), g.getSymType());
-  return builder.create<mlir::cir::GetGlobalOp>(
-      getLoc(D->getSourceRange()), ptrTy, g.getSymName(), tlsAccess);
+  return builder.create<mlir::cir::GetGlobalOp>(getLoc(D->getSourceRange()),
+                                                ptrTy, g.getSymName());
 }
 
 mlir::cir::GlobalViewAttr

clang/lib/CIR/Dialect/IR/CIRDialect.cpp

@@ -1634,13 +1634,9 @@ GetGlobalOp::verifySymbolUses(SymbolTableCollection &symbolTable) {
            << "' does not reference a valid cir.global or cir.func";
 
   mlir::Type symTy;
-  if (auto g = dyn_cast<GlobalOp>(op)) {
+  if (auto g = dyn_cast<GlobalOp>(op))
     symTy = g.getSymType();
-    // Verify that for thread local global access, the global needs to
-    // be marked with tls bits.
-    if (getTls() && !g.getTlsModel())
-      return emitOpError("access to global not marked thread local");
-  } else if (auto f = dyn_cast<FuncOp>(op))
+  else if (auto f = dyn_cast<FuncOp>(op))
     symTy = f.getFunctionType();
   else
     llvm_unreachable("shall not get here");

clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp

@@ -1613,16 +1613,7 @@ class CIRGetGlobalOpLowering
 
     auto type = getTypeConverter()->convertType(op.getType());
     auto symbol = op.getName();
-    mlir::Operation *newop =
-        rewriter.create<mlir::LLVM::AddressOfOp>(op.getLoc(), type, symbol);
-
-    if (op.getTls()) {
-      // Handle access to TLS via intrinsic.
-      newop = rewriter.create<mlir::LLVM::ThreadlocalAddressOp>(
-          op.getLoc(), type, newop->getResult(0));
-    }
-
-    rewriter.replaceOp(op, newop);
+    rewriter.replaceOpWithNewOp<mlir::LLVM::AddressOfOp>(op, type, symbol);
     return mlir::success();
   }
 };
@@ -2287,6 +2278,36 @@ class CIRBitClrsbOpLowering
   }
 };
 
+class CIRObjSizeOpLowering
+    : public mlir::OpConversionPattern<mlir::cir::ObjSizeOp> {
+public:
+  using OpConversionPattern<mlir::cir::ObjSizeOp>::OpConversionPattern;
+
+  mlir::LogicalResult
+  matchAndRewrite(mlir::cir::ObjSizeOp op, OpAdaptor adaptor,
+                  mlir::ConversionPatternRewriter &rewriter) const override {
+    auto llvmResTy = getTypeConverter()->convertType(op.getType());
+    auto loc = op->getLoc();
+
+    auto llvmIntrinNameAttr =
+        mlir::StringAttr::get(rewriter.getContext(), "llvm.objectsize");
+    mlir::cir::SizeInfoType kindInfo = op.getKind();
+    auto falseValue = rewriter.create<mlir::LLVM::ConstantOp>(
+        loc, rewriter.getI1Type(), false);
+    auto trueValue = rewriter.create<mlir::LLVM::ConstantOp>(
+        loc, rewriter.getI1Type(), true);
+
+    rewriter.replaceOpWithNewOp<mlir::LLVM::CallIntrinsicOp>(
+        op, llvmResTy, llvmIntrinNameAttr,
+        mlir::ValueRange{adaptor.getPtr(),
+                         kindInfo == mlir::cir::SizeInfoType::max ? falseValue
+                                                                  : trueValue,
+                         trueValue, op.getDynamic() ? trueValue : falseValue});
+
+    return mlir::LogicalResult::success();
+  }
+};
+
 class CIRBitClzOpLowering
     : public mlir::OpConversionPattern<mlir::cir::BitClzOp> {
 public:
@@ -3034,8 +3055,8 @@ void populateCIRToLLVMConversionPatterns(mlir::RewritePatternSet &patterns,
       CIRVectorShuffleVecLowering, CIRStackSaveLowering,
       CIRStackRestoreLowering, CIRUnreachableLowering, CIRTrapLowering,
       CIRInlineAsmOpLowering, CIRSetBitfieldLowering, CIRGetBitfieldLowering,
-      CIRPrefetchLowering, CIRIsConstantOpLowering>(converter,
-                                                    patterns.getContext());
+      CIRPrefetchLowering, CIRObjSizeOpLowering, CIRIsConstantOpLowering>(
+      converter, patterns.getContext());
 }
 
 namespace {

clang/test/CIR/CodeGen/pass-object-size.c

@@ -0,0 +1,29 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fclangir -emit-cir %s -o %t.cir
+// RUN: FileCheck --input-file=%t.cir %s -check-prefix=CIR
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fclangir -emit-llvm %s -o %t.ll
+// RUN: FileCheck --input-file=%t.ll %s -check-prefix=LLVM
+
+void b(void *__attribute__((pass_object_size(0))));
+void e(void *__attribute__((pass_object_size(2))));
+void c() {
+  int a;
+  int d[a];
+  b(d);
+  e(d);
+}
+
+// CIR: cir.func no_proto @c()
+// CIR: [[TMP0:%.*]] = cir.alloca !s32i, cir.ptr <!s32i>, %{{[0-9]+}} : !u64i, ["vla"] {alignment = 16 : i64}
+// CIR: [[TMP1:%.*]] = cir.cast(bitcast, [[TMP0]] : !cir.ptr<!s32i>), !cir.ptr<!void>
+// CIR-NEXT: [[TMP2:%.*]] = cir.objsize([[TMP1]] : <!void>, max) -> !u64i
+// CIR-NEXT: cir.call @b([[TMP1]], [[TMP2]]) : (!cir.ptr<!void>, !u64i) -> ()
+// CIR: [[TMP3:%.*]] = cir.cast(bitcast, [[TMP0]] : !cir.ptr<!s32i>), !cir.ptr<!void>
+// CIR: [[TMP4:%.*]] = cir.objsize([[TMP3]] : <!void>, min) -> !u64i
+// CIR-NEXT: cir.call @e([[TMP3]], [[TMP4]]) : (!cir.ptr<!void>, !u64i) -> ()
+
+// LLVM: define void @c()
+// LLVM: [[TMP0:%.*]] = alloca i32, i64 %{{[0-9]+}},
+// LLVM: [[TMP1:%.*]] = call i64 @llvm.objectsize.i64.p0(ptr [[TMP0]], i1 false, i1 true, i1 false),
+// LLVM-NEXT: call void @b(ptr [[TMP0]], i64 [[TMP1]])
+// LLVM: [[TMP2:%.*]] = call i64 @llvm.objectsize.i64.p0(ptr [[TMP0]], i1 true, i1 true, i1 false),
+// LLVM-NEXT: call void @e(ptr [[TMP0]], i64 [[TMP2]])

clang/test/CIR/CodeGen/tls.c

@@ -3,17 +3,6 @@
 // RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fclangir -emit-llvm %s -o %t.ll
 // RUN: FileCheck --check-prefix=LLVM --input-file=%t.ll %s
 
-extern __thread int b;
-int c(void) { return *&b; }
-// CIR: cir.global "private" external tls_dyn @b : !s32i
-// CIR: cir.func @c() -> !s32i
-// CIR:   %[[TLS_ADDR:.*]] = cir.get_global thread_local @b : cir.ptr <!s32i>
-
 __thread int a;
 // CIR: cir.global external tls_dyn @a = #cir.int<0> : !s32i
-
-// LLVM: @b = external thread_local global i32
 // LLVM: @a = thread_local global i32 0
-
-// LLVM-LABEL: @c
-// LLVM: = call ptr @llvm.threadlocal.address.p0(ptr @b)

clang/test/CIR/IR/global.cir

@@ -63,12 +63,6 @@ module {
   cir.global external tls_local_dyn @model1 = #cir.int<0> : !s32i
   cir.global external tls_init_exec @model2 = #cir.int<0> : !s32i
   cir.global external tls_local_exec @model3 = #cir.int<0> : !s32i
-
-  cir.global "private" external tls_dyn @batata : !s32i
-  cir.func @f35() {
-    %0 = cir.get_global thread_local @batata : cir.ptr <!s32i>
-    cir.return
-  }
 }
 
 // CHECK: cir.global external @a = #cir.int<3> : !s32i
@@ -97,10 +91,4 @@ module {
 // CHECK: cir.global external tls_dyn @model0 = #cir.int<0> : !s32i
 // CHECK: cir.global external tls_local_dyn @model1 = #cir.int<0> : !s32i
 // CHECK: cir.global external tls_init_exec @model2 = #cir.int<0> : !s32i
-// CHECK: cir.global external tls_local_exec @model3 = #cir.int<0> : !s32i
-
-// CHECK: cir.global "private" external tls_dyn @batata : !s32i
-// CHECK: cir.func @f35() {
-// CHECK:   %0 = cir.get_global thread_local @batata : cir.ptr <!s32i>
-// CHECK:   cir.return
-// CHECK: }
+// CHECK: cir.global external tls_local_exec @model3 = #cir.int<0> : !s32i

clang/test/CIR/IR/invalid.cir

@@ -1033,16 +1033,3 @@ cir.func @bad_fetch(%x: !cir.ptr<!cir.float>, %y: !cir.float) -> () {
   %12 = cir.atomic.fetch(xor, %x : !cir.ptr<!cir.float>, %y : !cir.float, seq_cst) : !cir.float
   cir.return
 }
-
-// -----
-
-!s32i = !cir.int<s, 32>
-
-module {
-  cir.global "private" external @batata : !s32i
-  cir.func @f35() {
-    // expected-error@+1 {{access to global not marked thread local}}
-    %0 = cir.get_global thread_local @batata : cir.ptr <!s32i>
-    cir.return
-  }
-}