[MLIR][LLVM] Make subprogram flags optional (#86433)

This revision makes the subprogramFlags field in the DISubprogrammAttr
optional. This is necessary since the DISubprogram attached to a
declaration may have none of the subprogram flags set.

5 files changed, 12 insertions, 13 deletions

diff --git a/mlir/include/mlir/Dialect/LLVMIR/LLVMAttrDefs.td b/mlir/include/mlir/Dialect/LLVMIR/LLVMAttrDefs.td
index 1b1824a..91bd370 100644
--- a/mlir/include/mlir/Dialect/LLVMIR/LLVMAttrDefs.td
+++ b/mlir/include/mlir/Dialect/LLVMIR/LLVMAttrDefs.td
@@ -546,7 +546,7 @@ def LLVM_DISubprogramAttr : LLVM_Attr<"DISubprogram", "di_subprogram",
     "DIFileAttr":$file,
     OptionalParameter<"unsigned">:$line,
     OptionalParameter<"unsigned">:$scopeLine,
-    "DISubprogramFlags":$subprogramFlags,
+    OptionalParameter<"DISubprogramFlags">:$subprogramFlags,
     OptionalParameter<"DISubroutineTypeAttr">:$type
   );
   let builders = [
diff --git a/mlir/lib/Target/LLVMIR/DebugImporter.cpp b/mlir/lib/Target/LLVMIR/DebugImporter.cpp
index 4bdc03a..779ad26 100644
--- a/mlir/lib/Target/LLVMIR/DebugImporter.cpp
+++ b/mlir/lib/Target/LLVMIR/DebugImporter.cpp
@@ -179,12 +179,13 @@ DISubprogramAttr DebugImporter::translateImpl(llvm::DISubprogram *node) {
   mlir::DistinctAttr id;
   if (node->isDistinct())
     id = getOrCreateDistinctID(node);
-  std::optional<DISubprogramFlags> subprogramFlags =
-      symbolizeDISubprogramFlags(node->getSubprogram()->getSPFlags());
   // Return nullptr if the scope or type is invalid.
   DIScopeAttr scope = translate(node->getScope());
   if (node->getScope() && !scope)
     return nullptr;
+  std::optional<DISubprogramFlags> subprogramFlags =
+      symbolizeDISubprogramFlags(node->getSubprogram()->getSPFlags());
+  assert(subprogramFlags && "expected valid subprogram flags");
   DISubroutineTypeAttr type = translate(node->getType());
   if (node->getType() && !type)
     return nullptr;
@@ -192,8 +193,7 @@ DISubprogramAttr DebugImporter::translateImpl(llvm::DISubprogram *node) {
                                getStringAttrOrNull(node->getRawName()),
                                getStringAttrOrNull(node->getRawLinkageName()),
                                translate(node->getFile()), node->getLine(),
-                               node->getScopeLine(), subprogramFlags.value(),
-                               type);
+                               node->getScopeLine(), *subprogramFlags, type);
 }
 
 DISubrangeAttr DebugImporter::translateImpl(llvm::DISubrange *node) {
diff --git a/mlir/test/Dialect/LLVMIR/debuginfo.mlir b/mlir/test/Dialect/LLVMIR/debuginfo.mlir
index 4c2de0a..94bb2bb 100644
--- a/mlir/test/Dialect/LLVMIR/debuginfo.mlir
+++ b/mlir/test/Dialect/LLVMIR/debuginfo.mlir
@@ -96,11 +96,10 @@
   file = #file, line = 3, scopeLine = 3, subprogramFlags = "Definition|Optimized", type = #spType0
 >
 
-// CHECK-DAG: #[[SP1:.*]] = #llvm.di_subprogram<compileUnit = #[[CU]], scope = #[[COMP2]], name = "value", file = #[[FILE]], subprogramFlags = Definition, type = #[[SPTYPE1]]>
+// CHECK-DAG: #[[SP1:.*]] = #llvm.di_subprogram<scope = #[[COMP2]], file = #[[FILE]], type = #[[SPTYPE1]]>
 #sp1 = #llvm.di_subprogram<
-  // Omit the optional linkageName parameter.
-  compileUnit = #cu, scope = #comp2, name = "value",
-  file = #file, subprogramFlags = "Definition", type = #spType1
+  // Omit the optional parameters.
+  scope = #comp2, file = #file, type = #spType1
 >
 
 // CHECK-DAG: #[[MODULE:.*]] = #llvm.di_module<file = #[[FILE]], scope = #[[FILE]], name = "module", configMacros = "bar", includePath = "/", apinotes = "/", line = 42, isDecl = true>
@@ -112,7 +111,6 @@
 
 // CHECK-DAG: #[[SP2:.*]] = #llvm.di_subprogram<compileUnit = #[[CU]], scope = #[[MODULE]], name = "value", file = #[[FILE]], subprogramFlags = Definition, type = #[[SPTYPE2]]>
 #sp2 = #llvm.di_subprogram<
-  // Omit the optional linkageName parameter.
   compileUnit = #cu, scope = #module, name = "value",
   file = #file, subprogramFlags = "Definition", type = #spType2
 >
diff --git a/mlir/test/Target/LLVMIR/Import/debug-info.ll b/mlir/test/Target/LLVMIR/Import/debug-info.ll
index a7947eb..959a5a1 100644
--- a/mlir/test/Target/LLVMIR/Import/debug-info.ll
+++ b/mlir/test/Target/LLVMIR/Import/debug-info.ll
@@ -601,8 +601,9 @@ declare !dbg !1 void @declaration()
 
 ; CHECK: #di_subprogram = #llvm.di_subprogram<
 ; CHECK-NOT: id = distinct
+; CHECK-NOT: subprogramFlags =
 
 !llvm.module.flags = !{!0}
 !0 = !{i32 2, !"Debug Info Version", i32 3}
-!1 = !DISubprogram(name: "declaration", scope: !2, file: !2, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!1 = !DISubprogram(name: "declaration", scope: !2, file: !2, flags: DIFlagPrototyped, spFlags: 0)
 !2 = !DIFile(filename: "debug-info.ll", directory: "/")
diff --git a/mlir/test/Target/LLVMIR/llvmir-debug.mlir b/mlir/test/Target/LLVMIR/llvmir-debug.mlir
index c34f918..785a525 100644
--- a/mlir/test/Target/LLVMIR/llvmir-debug.mlir
+++ b/mlir/test/Target/LLVMIR/llvmir-debug.mlir
@@ -172,14 +172,14 @@ llvm.func @empty_types() {
 
 #di_file = #llvm.di_file<"foo.mlir" in "/test/">
 #di_subprogram = #llvm.di_subprogram<
-  scope = #di_file, name = "func_decl_with_subprogram", file = #di_file, subprogramFlags = "Optimized"
+  scope = #di_file, name = "func_decl_with_subprogram", file = #di_file
 >
 
 // CHECK-LABEL: declare !dbg
 // CHECK-SAME: ![[SUBPROGRAM:.*]] i32 @func_decl_with_subprogram(
 llvm.func @func_decl_with_subprogram() -> (i32) loc(fused<#di_subprogram>["foo.mlir":2:1])
 
-// CHECK: ![[SUBPROGRAM]] = !DISubprogram(name: "func_decl_with_subprogram", scope: ![[FILE:.*]], file: ![[FILE]], spFlags: DISPFlagOptimized)
+// CHECK: ![[SUBPROGRAM]] = !DISubprogram(name: "func_decl_with_subprogram", scope: ![[FILE:.*]], file: ![[FILE]], spFlags: 0)
 // CHECK: ![[FILE]] = !DIFile(filename: "foo.mlir", directory: "/test/")
 
 // -----