[clang] [OpenMP 6.0] Allow only `byref` arguments with `need_device_addr` modifier on `adjust_args` clause (PR #149573)
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Fri Jul 18 12:40:57 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang
Author: Fazlay Rabbi (mdfazlay)
<details>
<summary>Changes</summary>
If the `need_device_addr` adjust-op modifier is present, each list item that appears in the clause must refer to an argument in the declaration of the function variant that has a reference type.
Reference:
OpenMP 6.0 [Sec 9.6.2, page 332, line 31-33, adjust_args clause, Restrictions]
---
Full diff: https://github.com/llvm/llvm-project/pull/149573.diff
4 Files Affected:
- (modified) clang/include/clang/Basic/DiagnosticParseKinds.td (+3)
- (modified) clang/lib/Sema/SemaOpenMP.cpp (+15)
- (modified) clang/test/OpenMP/declare_variant_clauses_ast_print.cpp (+13-13)
- (modified) clang/test/OpenMP/declare_variant_clauses_messages.cpp (+12)
``````````diff
diff --git a/clang/include/clang/Basic/DiagnosticParseKinds.td b/clang/include/clang/Basic/DiagnosticParseKinds.td
index 35903af998fbe..995684f472385 100644
--- a/clang/include/clang/Basic/DiagnosticParseKinds.td
+++ b/clang/include/clang/Basic/DiagnosticParseKinds.td
@@ -1594,6 +1594,9 @@ def err_omp_unknown_adjust_args_op
def err_omp_declare_variant_wrong_clause : Error<
"expected %select{'match'|'match', 'adjust_args', or 'append_args'}0 clause "
"on 'omp declare variant' directive">;
+def err_omp_non_by_ref_need_device_addr_modifier_argument
+ : Error<"expected reference type argument on 'adjust_args' clause with "
+ "'need_device_addr' modifier">;
def err_omp_declare_variant_duplicate_nested_trait : Error<
"nested OpenMP context selector contains duplicated trait '%0'"
" in selector '%1' and set '%2' with different score">;
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index 4ecc9b0d4c5c8..a26f8f1691435 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -7612,6 +7612,21 @@ void SemaOpenMP::ActOnOpenMPDeclareVariantDirective(
return;
}
+ // OpenMP 6.0 [9.6.2 (page 332, line 31-33, adjust_args clause, Restrictions]
+ // If the `need_device_addr` adjust-op modifier is present, each list item
+ // that appears in the clause must refer to an argument in the declaration of
+ // the function variant that has a reference type
+ for (Expr *E : AdjustArgsNeedDeviceAddr) {
+ E = E->IgnoreParenImpCasts();
+ if (const auto *DRE = dyn_cast<DeclRefExpr>(E)) {
+ if (const auto *VD = dyn_cast<VarDecl>(DRE->getDecl())) {
+ if (!VD->getType()->isReferenceType())
+ Diag(E->getExprLoc(),
+ diag::err_omp_non_by_ref_need_device_addr_modifier_argument);
+ }
+ }
+ }
+
auto *NewAttr = OMPDeclareVariantAttr::CreateImplicit(
getASTContext(), VariantRef, &TI,
const_cast<Expr **>(AdjustArgsNothing.data()), AdjustArgsNothing.size(),
diff --git a/clang/test/OpenMP/declare_variant_clauses_ast_print.cpp b/clang/test/OpenMP/declare_variant_clauses_ast_print.cpp
index c14e19cc8b7ec..e98a23e865cf8 100644
--- a/clang/test/OpenMP/declare_variant_clauses_ast_print.cpp
+++ b/clang/test/OpenMP/declare_variant_clauses_ast_print.cpp
@@ -38,11 +38,11 @@
#ifndef HEADER
#define HEADER
-void foo_v1(float *AAA, float *BBB, int *I) {return;}
-void foo_v2(float *AAA, float *BBB, int *I) {return;}
-void foo_v3(float *AAA, float *BBB, int *I) {return;}
+void foo_v1(float *AAA, float *BBB, int &CCC, int *I) {return;}
+void foo_v2(float *AAA, float *BBB, int &CCC, int *I) {return;}
+void foo_v3(float *AAA, float *BBB, int &CCC, int *I) {return;}
-//DUMP: FunctionDecl{{.*}} foo 'void (float *, float *, int *)'
+//DUMP: FunctionDecl{{.*}} foo 'void (float *, float *, int &, int *)'
//DUMP: OMPDeclareVariantAttr{{.*}}device={arch(x86, x86_64)}
//DUMP: DeclRefExpr{{.*}}Function{{.*}}foo_v3
//DUMP: DeclRefExpr{{.*}}ParmVar{{.*}}'I'
@@ -54,9 +54,9 @@ void foo_v3(float *AAA, float *BBB, int *I) {return;}
//DUMP: DeclRefExpr{{.*}}Function{{.*}}foo_v1
//DUMP: DeclRefExpr{{.*}}ParmVar{{.*}}'AAA'
//DUMP: DeclRefExpr{{.*}}ParmVar{{.*}}'BBB'
-//PRINT: #pragma omp declare variant(foo_v3) match(construct={dispatch}, device={arch(x86, x86_64)}) adjust_args(nothing:I) adjust_args(need_device_ptr:BBB) adjust_args(need_device_addr:AAA)
+//PRINT: #pragma omp declare variant(foo_v3) match(construct={dispatch}, device={arch(x86, x86_64)}) adjust_args(nothing:I) adjust_args(need_device_ptr:BBB) adjust_args(need_device_addr:CCC)
-//PRINT: #pragma omp declare variant(foo_v2) match(construct={dispatch}, device={arch(ppc)}) adjust_args(need_device_ptr:AAA) adjust_args(need_device_addr:BBB)
+//PRINT: #pragma omp declare variant(foo_v2) match(construct={dispatch}, device={arch(ppc)}) adjust_args(need_device_ptr:AAA) adjust_args(need_device_addr:CCC)
//PRINT: omp declare variant(foo_v1) match(construct={dispatch}, device={arch(arm)}) adjust_args(need_device_ptr:AAA,BBB)
@@ -67,33 +67,33 @@ void foo_v3(float *AAA, float *BBB, int *I) {return;}
#pragma omp declare variant(foo_v2) \
match(construct={dispatch}, device={arch(ppc)}), \
adjust_args(need_device_ptr:AAA) \
- adjust_args(need_device_addr:BBB)
+ adjust_args(need_device_addr:CCC)
#pragma omp declare variant(foo_v3) \
adjust_args(need_device_ptr:BBB) adjust_args(nothing:I) \
- adjust_args(need_device_addr:AAA) \
+ adjust_args(need_device_addr:CCC) \
match(construct={dispatch}, device={arch(x86,x86_64)})
-void foo(float *AAA, float *BBB, int *I) {return;}
+void foo(float *AAA, float *BBB, int &CCC, int *I) {return;}
-void Foo_Var(float *AAA, float *BBB, float *CCC) {return;}
+void Foo_Var(float *AAA, float *BBB, float *&CCC) {return;}
#pragma omp declare variant(Foo_Var) \
match(construct={dispatch}, device={arch(x86_64)}) \
adjust_args(need_device_ptr:AAA) adjust_args(nothing:BBB) \
adjust_args(need_device_addr:CCC)
template<typename T>
-void Foo(T *AAA, T *BBB, T *CCC) {return;}
+void Foo(T *AAA, T *BBB, T *&CCC) {return;}
//PRINT: #pragma omp declare variant(Foo_Var) match(construct={dispatch}, device={arch(x86_64)}) adjust_args(nothing:BBB) adjust_args(need_device_ptr:AAA) adjust_args(need_device_addr:CCC)
-//DUMP: FunctionDecl{{.*}} Foo 'void (T *, T *, T *)'
+//DUMP: FunctionDecl{{.*}} Foo 'void (T *, T *, T *&)'
//DUMP: OMPDeclareVariantAttr{{.*}}device={arch(x86_64)}
//DUMP: DeclRefExpr{{.*}}Function{{.*}}Foo_Var
//DUMP: DeclRefExpr{{.*}}ParmVar{{.*}}'BBB'
//DUMP: DeclRefExpr{{.*}}ParmVar{{.*}}'AAA'
//DUMP: DeclRefExpr{{.*}}ParmVar{{.*}}'CCC'
//
-//DUMP: FunctionDecl{{.*}} Foo 'void (float *, float *, float *)'
+//DUMP: FunctionDecl{{.*}} Foo 'void (float *, float *, float *&)'
//DUMP: OMPDeclareVariantAttr{{.*}}device={arch(x86_64)}
//DUMP: DeclRefExpr{{.*}}Function{{.*}}Foo_Var
//DUMP: DeclRefExpr{{.*}}ParmVar{{.*}}'BBB'
diff --git a/clang/test/OpenMP/declare_variant_clauses_messages.cpp b/clang/test/OpenMP/declare_variant_clauses_messages.cpp
index bca91481220ff..916d15fde9ff2 100644
--- a/clang/test/OpenMP/declare_variant_clauses_messages.cpp
+++ b/clang/test/OpenMP/declare_variant_clauses_messages.cpp
@@ -91,6 +91,7 @@ void foo_v1(float *AAA, float *BBB, int *I) { return; }
void foo_v2(float *AAA, float *BBB, int *I) { return; }
void foo_v3(float *AAA, float *BBB, int *I) { return; }
void foo_v4(float *AAA, float *BBB, int *I, omp_interop_t IOp) { return; }
+void foo_v5(float *AAA, float *BBB, int I) { return; }
#if _OPENMP >= 202011 // At least OpenMP 5.1
void vararg_foo(const char *fmt, omp_interop_t it, ...);
@@ -129,6 +130,11 @@ void vararg_bar2(const char *fmt) { return; }
adjust_args(nothing:J) \
match(construct={dispatch}, device={arch(x86,x86_64)})
+// expected-error at +2 {{expected reference type argument on 'adjust_args' clause with 'need_device_addr' modifier}}
+#pragma omp declare variant(foo_v1) \
+ adjust_args(need_device_addr:AAA) \
+ match(construct={dispatch}, device={arch(x86,x86_64)})
+
// expected-error at +2 {{expected reference to one of the parameters of function 'foo'}}
#pragma omp declare variant(foo_v3) \
adjust_args(nothing:Other) \
@@ -218,6 +224,12 @@ void vararg_bar2(const char *fmt) { return; }
void foo(float *AAA, float *BBB, int *I) { return; }
+// expected-error at +2 {{expected reference type argument on 'adjust_args' clause with 'need_device_addr' modifier}}
+#pragma omp declare variant(foo_v5) \
+ adjust_args(need_device_addr:I) \
+ match(construct={dispatch}, device={arch(x86,x86_64)})
+void foo5(float *AAA, float *BBB, int I) { return; }
+
#endif // NO_INTEROP_T_DEF
#ifdef C
``````````
</details>
https://github.com/llvm/llvm-project/pull/149573
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