[clang] [HLSL] Implement `export` keyword (PR #96823)
Helena Kotas via cfe-commits
cfe-commits at lists.llvm.org
Wed Jun 26 15:29:31 PDT 2024
https://github.com/hekota updated https://github.com/llvm/llvm-project/pull/96823
>From b67ecd20cc2c11f4f99c2d90c95fdbd988659947 Mon Sep 17 00:00:00 2001
From: Helena Kotas <hekotas at microsoft.com>
Date: Wed, 26 Jun 2024 12:31:39 -0700
Subject: [PATCH 1/2] [HLSL] Implement `export` keyword
Fixes #92812
---
.../clang/Basic/DiagnosticSemaKinds.td | 3 ++
clang/lib/Parse/ParseDeclCXX.cpp | 8 +++
clang/lib/Parse/Parser.cpp | 2 +-
clang/lib/Sema/SemaModule.cpp | 32 ++++++++++++
clang/test/AST/HLSL/export.hlsl | 23 +++++++++
clang/test/CodeGenHLSL/export.hlsl | 20 ++++++++
clang/test/SemaHLSL/export.hlsl | 50 +++++++++++++++++++
7 files changed, 137 insertions(+), 1 deletion(-)
create mode 100644 clang/test/AST/HLSL/export.hlsl
create mode 100644 clang/test/CodeGenHLSL/export.hlsl
create mode 100644 clang/test/SemaHLSL/export.hlsl
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index 25a87078a5709..a2465ecc936e0 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -12265,6 +12265,9 @@ def warn_hlsl_availability_unavailable :
Warning<err_unavailable.Summary>,
InGroup<HLSLAvailability>, DefaultError;
+def err_hlsl_export_not_on_function : Error<
+ "export declaration can only be used on functions">;
+
// Layout randomization diagnostics.
def err_non_designated_init_used : Error<
"a randomized struct can only be initialized with a designated initializer">;
diff --git a/clang/lib/Parse/ParseDeclCXX.cpp b/clang/lib/Parse/ParseDeclCXX.cpp
index 5e3ee5f0579aa..226377e93fe56 100644
--- a/clang/lib/Parse/ParseDeclCXX.cpp
+++ b/clang/lib/Parse/ParseDeclCXX.cpp
@@ -445,6 +445,14 @@ Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, DeclaratorContext Context) {
/// 'export' declaration
/// 'export' '{' declaration-seq[opt] '}'
///
+/// HLSL: Parse export function declaration.
+///
+/// export-function-declaration:
+/// 'export' function-declaration
+///
+/// export-declaration-group:
+/// 'export' '{' function-declaration-seq[opt] '}'
+///
Decl *Parser::ParseExportDeclaration() {
assert(Tok.is(tok::kw_export));
SourceLocation ExportLoc = ConsumeToken();
diff --git a/clang/lib/Parse/Parser.cpp b/clang/lib/Parse/Parser.cpp
index 6d0cf7b174e50..ddc8aa9b49e64 100644
--- a/clang/lib/Parse/Parser.cpp
+++ b/clang/lib/Parse/Parser.cpp
@@ -970,7 +970,7 @@ Parser::ParseExternalDeclaration(ParsedAttributes &Attrs,
SingleDecl = ParseModuleImport(SourceLocation(), IS);
} break;
case tok::kw_export:
- if (getLangOpts().CPlusPlusModules) {
+ if (getLangOpts().CPlusPlusModules || getLangOpts().HLSL) {
ProhibitAttributes(Attrs);
SingleDecl = ParseExportDeclaration();
break;
diff --git a/clang/lib/Sema/SemaModule.cpp b/clang/lib/Sema/SemaModule.cpp
index ad118ac90e4aa..e920b880ecb4d 100644
--- a/clang/lib/Sema/SemaModule.cpp
+++ b/clang/lib/Sema/SemaModule.cpp
@@ -851,6 +851,21 @@ Decl *Sema::ActOnStartExportDecl(Scope *S, SourceLocation ExportLoc,
CurContext->addDecl(D);
PushDeclContext(S, D);
+ if (getLangOpts().HLSL) {
+ // exported functions cannot be in an unnamed namespace
+ for (const DeclContext *DC = CurContext; DC; DC = DC->getLexicalParent()) {
+ if (const auto *ND = dyn_cast<NamespaceDecl>(DC)) {
+ if (ND->isAnonymousNamespace()) {
+ Diag(ExportLoc, diag::err_export_within_anonymous_namespace);
+ Diag(ND->getLocation(), diag::note_anonymous_namespace);
+ D->setInvalidDecl();
+ return D;
+ }
+ }
+ }
+ return D;
+ }
+
// C++2a [module.interface]p1:
// An export-declaration shall appear only [...] in the purview of a module
// interface unit. An export-declaration shall not appear directly or
@@ -924,6 +939,23 @@ static bool checkExportedDeclContext(Sema &S, DeclContext *DC,
/// Check that it's valid to export \p D.
static bool checkExportedDecl(Sema &S, Decl *D, SourceLocation BlockStart) {
+ // HLSL: export declaration is valid only on functions
+ if (S.getLangOpts().HLSL) {
+ auto *FD = dyn_cast<FunctionDecl>(D);
+ if (!FD) {
+ if (auto *ED2 = dyn_cast<ExportDecl>(D)) {
+ S.Diag(ED2->getBeginLoc(), diag::err_export_within_export);
+ if (auto *ED1 = dyn_cast<ExportDecl>(D->getDeclContext()))
+ S.Diag(ED1->getBeginLoc(), diag::note_export);
+ }
+ else {
+ S.Diag(D->getBeginLoc(), diag::err_hlsl_export_not_on_function);
+ }
+ D->setInvalidDecl();
+ return false;
+ }
+ }
+
// C++20 [module.interface]p3:
// [...] it shall not declare a name with internal linkage.
bool HasName = false;
diff --git a/clang/test/AST/HLSL/export.hlsl b/clang/test/AST/HLSL/export.hlsl
new file mode 100644
index 0000000000000..69c4fb2b457ac
--- /dev/null
+++ b/clang/test/AST/HLSL/export.hlsl
@@ -0,0 +1,23 @@
+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.3-library -finclude-default-header -x hlsl -ast-dump -o - %s | FileCheck %s
+
+// CHECK:ExportDecl 0x{{[0-9a-f]+}} <{{.*}}> col:1
+// CHECK:FunctionDecl 0x{{[0-9a-f]+}} <{{.*}}> col:13 used f1 'void ()'
+// CHECK:CompoundStmt 0x{{[0-9a-f]+}} <{{.*}}>
+export void f1() {}
+
+// CHECK:NamespaceDecl 0x{{[0-9a-f]+}} <{{.*}}>
+// CHECK:ExportDecl 0x{{[0-9a-f]+}} <{{.*}}> col:3
+// CHECK:FunctionDecl 0x{{[0-9a-f]+}} <{{.*}}> col:15 used f2 'void ()'
+// CHECK:CompoundStmt 0x{{[0-9a-f]+}} <{{.*}}>
+namespace MyNamespace {
+ export void f2() {}
+}
+
+// CHECK:ExportDecl 0x{{[0-9a-f]+}} <{{.*}}>
+// CHECK:FunctionDecl 0x{{[0-9a-f]+}} <{{.*}}> col:10 used f3 'void ()'
+// CHECK:FunctionDecl 0x{{[0-9a-f]+}} <{{.*}}> col:10 used f4 'void ()'
+// CHECK:CompoundStmt 0x{{[0-9a-f]+}} <{{.*}}>
+export {
+ void f3() {}
+ void f4() {}
+}
diff --git a/clang/test/CodeGenHLSL/export.hlsl b/clang/test/CodeGenHLSL/export.hlsl
new file mode 100644
index 0000000000000..cea8875684b9e
--- /dev/null
+++ b/clang/test/CodeGenHLSL/export.hlsl
@@ -0,0 +1,20 @@
+// RUN: %clang_cc1 -finclude-default-header -x hlsl -triple \
+// RUN: dxil-pc-shadermodel6.3-library %s \
+// RUN: -emit-llvm -disable-llvm-passes -o - | FileCheck %s
+
+// CHECK: define void @"?f1@@YAXXZ"()
+export void f1() {
+}
+
+// CHECK: define void @"?f2 at MyNamespace@@YAXXZ"()
+namespace MyNamespace {
+ export void f2() {
+ }
+}
+
+export {
+// CHECK: define void @"?f3@@YAXXZ"()
+// CHECK: define void @"?f4@@YAXXZ"()
+ void f3() {}
+ void f4() {}
+}
\ No newline at end of file
diff --git a/clang/test/SemaHLSL/export.hlsl b/clang/test/SemaHLSL/export.hlsl
new file mode 100644
index 0000000000000..0cb9248f3f589
--- /dev/null
+++ b/clang/test/SemaHLSL/export.hlsl
@@ -0,0 +1,50 @@
+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.3-library -x hlsl -o - %s -verify
+
+export void f1();
+
+export void f1() {}
+
+namespace { // expected-note {{anonymous namespace begins here}}
+ export void f2(); // expected-error {{export declaration appears within anonymous namespace}}
+}
+
+export void f3();
+
+export { // expected-note {{export block begins here}}
+ void f4() {}
+ export void f5() {} // expected-error {{export declaration appears within another export declaration}}
+ int A; // expected-error {{export declaration can only be used on functions}}
+ namespace ns { // expected-error {{export declaration can only be used on functions}}
+ void f6();
+ }
+}
+
+void export f7() {} // expected-error {{expected unqualified-id}}
+
+export static void f8() {} // expected-error {{declaration of 'f8' with internal linkage cannot be exported}}
+
+export void f9(); // expected-note {{previous declaration is here}}
+static void f9(); // expected-error {{static declaration of 'f9' follows non-static declaration}}
+
+static void f10(); // expected-note {{previous declaration is here}}
+export void f10(); // expected-error {{cannot export redeclaration 'f10' here since the previous declaration has internal linkage}}
+
+export float V1; // expected-error {{export declaration can only be used on functions}}
+
+static export float V2; // expected-error{{expected unqualified-id}}
+
+export static float V3 = 0; // expected-error {{export declaration can only be used on functions}}
+
+export groupshared float V4; // expected-error {{export declaration can only be used on functions}}
+
+void f6() {
+ export int i; // expected-error {{expected expression}}
+}
+
+export cbuffer CB { // expected-error {{export declaration can only be used on functions}}
+ int a;
+}
+
+export template<typename T> void tf1(T t) {} // expected-error {{export declaration can only be used on functions}}
+
+void f5() export {} // expected-error {{expected function body after function declarator}}
\ No newline at end of file
>From 327f96bfe417559ec9836279c00af42230075740 Mon Sep 17 00:00:00 2001
From: Helena Kotas <hekotas at microsoft.com>
Date: Wed, 26 Jun 2024 15:29:12 -0700
Subject: [PATCH 2/2] Add new lines at the end of test files
---
clang/test/CodeGenHLSL/export.hlsl | 2 +-
clang/test/SemaHLSL/export.hlsl | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/clang/test/CodeGenHLSL/export.hlsl b/clang/test/CodeGenHLSL/export.hlsl
index cea8875684b9e..53f603739e329 100644
--- a/clang/test/CodeGenHLSL/export.hlsl
+++ b/clang/test/CodeGenHLSL/export.hlsl
@@ -17,4 +17,4 @@ export {
// CHECK: define void @"?f4@@YAXXZ"()
void f3() {}
void f4() {}
-}
\ No newline at end of file
+}
diff --git a/clang/test/SemaHLSL/export.hlsl b/clang/test/SemaHLSL/export.hlsl
index 0cb9248f3f589..6e53344dbee08 100644
--- a/clang/test/SemaHLSL/export.hlsl
+++ b/clang/test/SemaHLSL/export.hlsl
@@ -47,4 +47,4 @@ export cbuffer CB { // expected-error {{export declaration can only be used on f
export template<typename T> void tf1(T t) {} // expected-error {{export declaration can only be used on functions}}
-void f5() export {} // expected-error {{expected function body after function declarator}}
\ No newline at end of file
+void f5() export {} // expected-error {{expected function body after function declarator}}
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