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[CIR] Upstream CompoundLiteralExpr for Scalar #148943

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Upstream CompoundLiteralExpr for Scalar as a prerequisite for CompoundLiteralExpr for ComplexType

@llvmbot llvmbot added clang Clang issues not falling into any other category ClangIR Anything related to the ClangIR project labels Jul 15, 2025
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llvmbot commented Jul 15, 2025

@llvm/pr-subscribers-clang

Author: Amr Hesham (AmrDeveloper)

Changes

Upstream CompoundLiteralExpr for Scalar as a prerequisite for CompoundLiteralExpr for ComplexType

Full diff: https://github.com/llvm/llvm-project/pull/148943.diff

5 Files Affected:

  • (modified) clang/lib/CIR/CodeGen/CIRGenExpr.cpp (+62)
  • (modified) clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp (+4)
  • (modified) clang/lib/CIR/CodeGen/CIRGenFunction.cpp (+2)
  • (modified) clang/lib/CIR/CodeGen/CIRGenFunction.h (+6)
  • (added) clang/test/CIR/CodeGen/compound_literal.cpp (+42)
diff --git a/clang/lib/CIR/CodeGen/CIRGenExpr.cpp b/clang/lib/CIR/CodeGen/CIRGenExpr.cpp
index 51da48d330f55..11b66f4dda049 100644
--- a/clang/lib/CIR/CodeGen/CIRGenExpr.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenExpr.cpp
@@ -1053,6 +1053,68 @@ LValue CIRGenFunction::emitMemberExpr(const MemberExpr *e) {
   llvm_unreachable("Unhandled member declaration!");
 }
 
+/// Evaluate an expression into a given memory location.
+void CIRGenFunction::emitAnyExprToMem(const Expr *e, Address location,
+                                      Qualifiers quals, bool isInit) {
+  // FIXME: This function should take an LValue as an argument.
+  switch (getEvaluationKind(e->getType())) {
+  case cir::TEK_Complex: {
+    RValue rv = RValue::get(emitComplexExpr(e));
+    LValue lv = makeAddrLValue(location, e->getType());
+    emitStoreThroughLValue(rv, lv);
+    return;
+  }
+
+  case cir::TEK_Aggregate: {
+    emitAggExpr(e, AggValueSlot::forAddr(location, quals,
+                                         AggValueSlot::IsDestructed_t(isInit),
+                                         AggValueSlot::IsAliased_t(!isInit),
+                                         AggValueSlot::MayOverlap));
+    return;
+  }
+
+  case cir::TEK_Scalar: {
+    RValue rv = RValue::get(emitScalarExpr(e));
+    LValue lv = makeAddrLValue(location, e->getType());
+    emitStoreThroughLValue(rv, lv);
+    return;
+  }
+  }
+
+  llvm_unreachable("bad evaluation kind");
+}
+
+LValue CIRGenFunction::emitCompoundLiteralLValue(const CompoundLiteralExpr *e) {
+  if (e->isFileScope()) {
+    cgm.errorNYI(e->getSourceRange(), "emitCompoundLiteralLValue: FileScope");
+    return {};
+  }
+
+  if (e->getType()->isVariablyModifiedType()) {
+    cgm.errorNYI(e->getSourceRange(),
+                 "emitCompoundLiteralLValue: VariablyModifiedType");
+    return {};
+  }
+
+  Address declPtr = createMemTemp(e->getType(), getLoc(e->getSourceRange()),
+                                  ".compoundliteral");
+  const Expr *initExpr = e->getInitializer();
+  LValue result = makeAddrLValue(declPtr, e->getType(), AlignmentSource::Decl);
+
+  emitAnyExprToMem(initExpr, declPtr, e->getType().getQualifiers(),
+                   /*Init*/ true);
+
+  // Block-scope compound literals are destroyed at the end of the enclosing
+  // scope in C.
+  if (!getLangOpts().CPlusPlus && e->getType().isDestructedType()) {
+    cgm.errorNYI(e->getSourceRange(),
+                 "emitCompoundLiteralLValue: non C++ DestructedType");
+    return {};
+  }
+
+  return result;
+}
+
 LValue CIRGenFunction::emitCallExprLValue(const CallExpr *e) {
   RValue rv = emitCallExpr(e);
 
diff --git a/clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp b/clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp
index 9e13b4c83e3a8..23112be6bf3e7 100644
--- a/clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp
@@ -233,6 +233,10 @@ class ScalarExprEmitter : public StmtVisitor<ScalarExprEmitter, mlir::Value> {
 
   mlir::Value VisitMemberExpr(MemberExpr *e);
 
+  mlir::Value VisitCompoundLiteralExpr(CompoundLiteralExpr *e) {
+    return emitLoadOfLValue(e);
+  }
+
   mlir::Value VisitInitListExpr(InitListExpr *e);
 
   mlir::Value VisitExplicitCastExpr(ExplicitCastExpr *e) {
diff --git a/clang/lib/CIR/CodeGen/CIRGenFunction.cpp b/clang/lib/CIR/CodeGen/CIRGenFunction.cpp
index e532b9d855843..7e1a44ce602d4 100644
--- a/clang/lib/CIR/CodeGen/CIRGenFunction.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenFunction.cpp
@@ -698,6 +698,8 @@ LValue CIRGenFunction::emitLValue(const Expr *e) {
     return emitStringLiteralLValue(cast<StringLiteral>(e));
   case Expr::MemberExprClass:
     return emitMemberExpr(cast<MemberExpr>(e));
+  case Expr::CompoundLiteralExprClass:
+    return emitCompoundLiteralLValue(cast<CompoundLiteralExpr>(e));
   case Expr::BinaryOperatorClass:
     return emitBinaryOperatorLValue(cast<BinaryOperator>(e));
   case Expr::CompoundAssignOperatorClass: {
diff --git a/clang/lib/CIR/CodeGen/CIRGenFunction.h b/clang/lib/CIR/CodeGen/CIRGenFunction.h
index 1346333739bc1..3badb46f61e5f 100644
--- a/clang/lib/CIR/CodeGen/CIRGenFunction.h
+++ b/clang/lib/CIR/CodeGen/CIRGenFunction.h
@@ -757,6 +757,11 @@ class CIRGenFunction : public CIRGenTypeCache {
   RValue emitAnyExpr(const clang::Expr *e,
                      AggValueSlot aggSlot = AggValueSlot::ignored());
 
+  /// Emits the code necessary to evaluate an arbitrary expression into the
+  /// given memory location.
+  void emitAnyExprToMem(const Expr *e, Address location, Qualifiers quals,
+                        bool isInitializer);
+
   /// Similarly to emitAnyExpr(), however, the result will always be accessible
   /// even if no aggregate location is provided.
   RValue emitAnyExprToTemp(const clang::Expr *e);
@@ -828,6 +833,7 @@ class CIRGenFunction : public CIRGenTypeCache {
   mlir::Value emitCheckedArgForAssume(const Expr *e);
 
   LValue emitCompoundAssignmentLValue(const clang::CompoundAssignOperator *e);
+  LValue emitCompoundLiteralLValue(const CompoundLiteralExpr *e);
 
   void emitConstructorBody(FunctionArgList &args);
   void emitDestructorBody(FunctionArgList &args);
diff --git a/clang/test/CIR/CodeGen/compound_literal.cpp b/clang/test/CIR/CodeGen/compound_literal.cpp
new file mode 100644
index 0000000000000..a3f15b9437885
--- /dev/null
+++ b/clang/test/CIR/CodeGen/compound_literal.cpp
@@ -0,0 +1,42 @@
+// 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 -Wno-unused-value -fclangir -emit-llvm %s -o %t-cir.ll
+// RUN: FileCheck --input-file=%t-cir.ll %s -check-prefix=LLVM
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -Wno-unused-value -emit-llvm %s -o %t.ll
+// RUN: FileCheck --input-file=%t.ll %s -check-prefix=OGCG
+
+int foo() {
+  int e = (int){1};
+  return e;
+}
+
+// CIR: %[[RET:.*]] = cir.alloca !s32i, !cir.ptr<!s32i>, ["__retval"]
+// CIR: %[[INIT:.*]] = cir.alloca !s32i, !cir.ptr<!s32i>, ["e", init]
+// CIR: %[[COMPOUND:.*]] = cir.alloca !s32i, !cir.ptr<!s32i>, [".compoundliteral", init]
+// CIR: %[[VALUE:.*]] = cir.const #cir.int<1> : !s32i
+// CIR: cir.store{{.*}} %[[VALUE]], %[[COMPOUND]] : !s32i, !cir.ptr<!s32i>
+// CIR: %[[TMP:.*]] = cir.load{{.*}} %[[COMPOUND]] : !cir.ptr<!s32i>, !s32i
+// CIR: cir.store{{.*}}  %[[TMP]], %[[INIT]] : !s32i, !cir.ptr<!s32i>
+// CIR: %[[TMP_2:.*]] = cir.load{{.*}} %[[INIT]] : !cir.ptr<!s32i>, !s32i
+// CIR: cir.store %[[TMP_2]], %[[RET]] : !s32i, !cir.ptr<!s32i>
+// CIR: %[[TMP_3:.*]] = cir.load %[[RET]] : !cir.ptr<!s32i>, !s32i
+// CIR: cir.return %[[TMP_3]] : !s32i
+
+// LLVM: %[[RET:.*]] = alloca i32, i64 1, align 4
+// LLVM: %[[INIT:.*]] = alloca i32, i64 1, align 4
+// LLVM: %[[COMPOUND:.*]] = alloca i32, i64 1, align 4
+// LLVM: store i32 1, ptr %[[COMPOUND]], align 4
+// LLVM: %[[TMP:.*]] = load i32, ptr %[[COMPOUND]], align 4
+// LLVM: store i32 %[[TMP]], ptr %[[INIT]], align 4
+// LLVM: %[[TMP_2:.*]] = load i32, ptr %[[INIT]], align 4
+// LLVM: store i32 %[[TMP_2]], ptr %[[RET]], align 4
+// LLVM: %[[TMP_3:.*]] = load i32, ptr %[[RET]], align 4
+// LLVM: ret i32 %[[TMP_3]]
+
+// OGCG: %[[INIT:.*]] = alloca i32, align 4
+// OGCG: %[[COMPOUND:.*]] = alloca i32, align 4
+// OGCG: store i32 1, ptr %[[COMPOUND]], align 4
+// OGCG: %[[TMP:.*]] = load i32, ptr %[[COMPOUND]], align 4
+// OGCG: store i32 %[[TMP]], ptr %[[INIT]], align 4
+// OGCG: %[[TMP_2:.*]] = load i32, ptr %[[INIT]], align 4
+// OGCG: ret i32 %[[TMP_2]]

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llvmbot commented Jul 15, 2025

@llvm/pr-subscribers-clangir

Author: Amr Hesham (AmrDeveloper)

Changes

Upstream CompoundLiteralExpr for Scalar as a prerequisite for CompoundLiteralExpr for ComplexType

Full diff: https://github.com/llvm/llvm-project/pull/148943.diff

5 Files Affected:

  • (modified) clang/lib/CIR/CodeGen/CIRGenExpr.cpp (+62)
  • (modified) clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp (+4)
  • (modified) clang/lib/CIR/CodeGen/CIRGenFunction.cpp (+2)
  • (modified) clang/lib/CIR/CodeGen/CIRGenFunction.h (+6)
  • (added) clang/test/CIR/CodeGen/compound_literal.cpp (+42)
diff --git a/clang/lib/CIR/CodeGen/CIRGenExpr.cpp b/clang/lib/CIR/CodeGen/CIRGenExpr.cpp
index 51da48d330f55..11b66f4dda049 100644
--- a/clang/lib/CIR/CodeGen/CIRGenExpr.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenExpr.cpp
@@ -1053,6 +1053,68 @@ LValue CIRGenFunction::emitMemberExpr(const MemberExpr *e) {
   llvm_unreachable("Unhandled member declaration!");
 }
 
+/// Evaluate an expression into a given memory location.
+void CIRGenFunction::emitAnyExprToMem(const Expr *e, Address location,
+                                      Qualifiers quals, bool isInit) {
+  // FIXME: This function should take an LValue as an argument.
+  switch (getEvaluationKind(e->getType())) {
+  case cir::TEK_Complex: {
+    RValue rv = RValue::get(emitComplexExpr(e));
+    LValue lv = makeAddrLValue(location, e->getType());
+    emitStoreThroughLValue(rv, lv);
+    return;
+  }
+
+  case cir::TEK_Aggregate: {
+    emitAggExpr(e, AggValueSlot::forAddr(location, quals,
+                                         AggValueSlot::IsDestructed_t(isInit),
+                                         AggValueSlot::IsAliased_t(!isInit),
+                                         AggValueSlot::MayOverlap));
+    return;
+  }
+
+  case cir::TEK_Scalar: {
+    RValue rv = RValue::get(emitScalarExpr(e));
+    LValue lv = makeAddrLValue(location, e->getType());
+    emitStoreThroughLValue(rv, lv);
+    return;
+  }
+  }
+
+  llvm_unreachable("bad evaluation kind");
+}
+
+LValue CIRGenFunction::emitCompoundLiteralLValue(const CompoundLiteralExpr *e) {
+  if (e->isFileScope()) {
+    cgm.errorNYI(e->getSourceRange(), "emitCompoundLiteralLValue: FileScope");
+    return {};
+  }
+
+  if (e->getType()->isVariablyModifiedType()) {
+    cgm.errorNYI(e->getSourceRange(),
+                 "emitCompoundLiteralLValue: VariablyModifiedType");
+    return {};
+  }
+
+  Address declPtr = createMemTemp(e->getType(), getLoc(e->getSourceRange()),
+                                  ".compoundliteral");
+  const Expr *initExpr = e->getInitializer();
+  LValue result = makeAddrLValue(declPtr, e->getType(), AlignmentSource::Decl);
+
+  emitAnyExprToMem(initExpr, declPtr, e->getType().getQualifiers(),
+                   /*Init*/ true);
+
+  // Block-scope compound literals are destroyed at the end of the enclosing
+  // scope in C.
+  if (!getLangOpts().CPlusPlus && e->getType().isDestructedType()) {
+    cgm.errorNYI(e->getSourceRange(),
+                 "emitCompoundLiteralLValue: non C++ DestructedType");
+    return {};
+  }
+
+  return result;
+}
+
 LValue CIRGenFunction::emitCallExprLValue(const CallExpr *e) {
   RValue rv = emitCallExpr(e);
 
diff --git a/clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp b/clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp
index 9e13b4c83e3a8..23112be6bf3e7 100644
--- a/clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp
@@ -233,6 +233,10 @@ class ScalarExprEmitter : public StmtVisitor<ScalarExprEmitter, mlir::Value> {
 
   mlir::Value VisitMemberExpr(MemberExpr *e);
 
+  mlir::Value VisitCompoundLiteralExpr(CompoundLiteralExpr *e) {
+    return emitLoadOfLValue(e);
+  }
+
   mlir::Value VisitInitListExpr(InitListExpr *e);
 
   mlir::Value VisitExplicitCastExpr(ExplicitCastExpr *e) {
diff --git a/clang/lib/CIR/CodeGen/CIRGenFunction.cpp b/clang/lib/CIR/CodeGen/CIRGenFunction.cpp
index e532b9d855843..7e1a44ce602d4 100644
--- a/clang/lib/CIR/CodeGen/CIRGenFunction.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenFunction.cpp
@@ -698,6 +698,8 @@ LValue CIRGenFunction::emitLValue(const Expr *e) {
     return emitStringLiteralLValue(cast<StringLiteral>(e));
   case Expr::MemberExprClass:
     return emitMemberExpr(cast<MemberExpr>(e));
+  case Expr::CompoundLiteralExprClass:
+    return emitCompoundLiteralLValue(cast<CompoundLiteralExpr>(e));
   case Expr::BinaryOperatorClass:
     return emitBinaryOperatorLValue(cast<BinaryOperator>(e));
   case Expr::CompoundAssignOperatorClass: {
diff --git a/clang/lib/CIR/CodeGen/CIRGenFunction.h b/clang/lib/CIR/CodeGen/CIRGenFunction.h
index 1346333739bc1..3badb46f61e5f 100644
--- a/clang/lib/CIR/CodeGen/CIRGenFunction.h
+++ b/clang/lib/CIR/CodeGen/CIRGenFunction.h
@@ -757,6 +757,11 @@ class CIRGenFunction : public CIRGenTypeCache {
   RValue emitAnyExpr(const clang::Expr *e,
                      AggValueSlot aggSlot = AggValueSlot::ignored());
 
+  /// Emits the code necessary to evaluate an arbitrary expression into the
+  /// given memory location.
+  void emitAnyExprToMem(const Expr *e, Address location, Qualifiers quals,
+                        bool isInitializer);
+
   /// Similarly to emitAnyExpr(), however, the result will always be accessible
   /// even if no aggregate location is provided.
   RValue emitAnyExprToTemp(const clang::Expr *e);
@@ -828,6 +833,7 @@ class CIRGenFunction : public CIRGenTypeCache {
   mlir::Value emitCheckedArgForAssume(const Expr *e);
 
   LValue emitCompoundAssignmentLValue(const clang::CompoundAssignOperator *e);
+  LValue emitCompoundLiteralLValue(const CompoundLiteralExpr *e);
 
   void emitConstructorBody(FunctionArgList &args);
   void emitDestructorBody(FunctionArgList &args);
diff --git a/clang/test/CIR/CodeGen/compound_literal.cpp b/clang/test/CIR/CodeGen/compound_literal.cpp
new file mode 100644
index 0000000000000..a3f15b9437885
--- /dev/null
+++ b/clang/test/CIR/CodeGen/compound_literal.cpp
@@ -0,0 +1,42 @@
+// 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 -Wno-unused-value -fclangir -emit-llvm %s -o %t-cir.ll
+// RUN: FileCheck --input-file=%t-cir.ll %s -check-prefix=LLVM
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -Wno-unused-value -emit-llvm %s -o %t.ll
+// RUN: FileCheck --input-file=%t.ll %s -check-prefix=OGCG
+
+int foo() {
+  int e = (int){1};
+  return e;
+}
+
+// CIR: %[[RET:.*]] = cir.alloca !s32i, !cir.ptr<!s32i>, ["__retval"]
+// CIR: %[[INIT:.*]] = cir.alloca !s32i, !cir.ptr<!s32i>, ["e", init]
+// CIR: %[[COMPOUND:.*]] = cir.alloca !s32i, !cir.ptr<!s32i>, [".compoundliteral", init]
+// CIR: %[[VALUE:.*]] = cir.const #cir.int<1> : !s32i
+// CIR: cir.store{{.*}} %[[VALUE]], %[[COMPOUND]] : !s32i, !cir.ptr<!s32i>
+// CIR: %[[TMP:.*]] = cir.load{{.*}} %[[COMPOUND]] : !cir.ptr<!s32i>, !s32i
+// CIR: cir.store{{.*}}  %[[TMP]], %[[INIT]] : !s32i, !cir.ptr<!s32i>
+// CIR: %[[TMP_2:.*]] = cir.load{{.*}} %[[INIT]] : !cir.ptr<!s32i>, !s32i
+// CIR: cir.store %[[TMP_2]], %[[RET]] : !s32i, !cir.ptr<!s32i>
+// CIR: %[[TMP_3:.*]] = cir.load %[[RET]] : !cir.ptr<!s32i>, !s32i
+// CIR: cir.return %[[TMP_3]] : !s32i
+
+// LLVM: %[[RET:.*]] = alloca i32, i64 1, align 4
+// LLVM: %[[INIT:.*]] = alloca i32, i64 1, align 4
+// LLVM: %[[COMPOUND:.*]] = alloca i32, i64 1, align 4
+// LLVM: store i32 1, ptr %[[COMPOUND]], align 4
+// LLVM: %[[TMP:.*]] = load i32, ptr %[[COMPOUND]], align 4
+// LLVM: store i32 %[[TMP]], ptr %[[INIT]], align 4
+// LLVM: %[[TMP_2:.*]] = load i32, ptr %[[INIT]], align 4
+// LLVM: store i32 %[[TMP_2]], ptr %[[RET]], align 4
+// LLVM: %[[TMP_3:.*]] = load i32, ptr %[[RET]], align 4
+// LLVM: ret i32 %[[TMP_3]]
+
+// OGCG: %[[INIT:.*]] = alloca i32, align 4
+// OGCG: %[[COMPOUND:.*]] = alloca i32, align 4
+// OGCG: store i32 1, ptr %[[COMPOUND]], align 4
+// OGCG: %[[TMP:.*]] = load i32, ptr %[[COMPOUND]], align 4
+// OGCG: store i32 %[[TMP]], ptr %[[INIT]], align 4
+// OGCG: %[[TMP_2:.*]] = load i32, ptr %[[INIT]], align 4
+// OGCG: ret i32 %[[TMP_2]]

andykaylor
andykaylor reviewed Jul 16, 2025
View reviewed changes
clang/lib/CIR/CodeGen/CIRGenExpr.cpp
// FIXME: This function should take an LValue as an argument.
switch (getEvaluationKind(e->getType())) {
case cir::TEK_Complex: {
RValue rv = RValue::get(emitComplexExpr(e));
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Classic codegen calls emitComplexExprIntoLValue() here. That's probably because complex is stored using multiple operations there, but since we have this same function, it seems like a good idea to keep the same structure. It will make things easier if we decide to change how we handle complex values later.

clang/test/CIR/CodeGen/compound_literal.cpp
// RUN: FileCheck --input-file=%t.ll %s -check-prefix=OGCG

int foo() {
int e = (int){1};
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Can you add test cases for complex and aggregate?

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Complex type requires to handle it too in CIRGenExprComplex, i will do that in this PR and update tests

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