Index: include/llvm/IR/DebugInfoFlags.def =================================================================== --- include/llvm/IR/DebugInfoFlags.def +++ include/llvm/IR/DebugInfoFlags.def @@ -38,5 +38,6 @@ HANDLE_DI_FLAG((3 << 16), VirtualInheritance) HANDLE_DI_FLAG((1 << 18), IntroducedVirtual) HANDLE_DI_FLAG((1 << 19), BitField) +HANDLE_DI_FLAG((1 << 20), NoReturn) #undef HANDLE_DI_FLAG Index: include/llvm/IR/DebugInfoMetadata.h =================================================================== --- include/llvm/IR/DebugInfoMetadata.h +++ include/llvm/IR/DebugInfoMetadata.h @@ -1419,6 +1419,13 @@ return getFlags() & FlagRValueReference; } + /// \brief Check if this is marked as noreturn. + /// + /// Return true if this subprogram is C++11 noreturn or C11 _Noreturn + unsigned isNoReturn() const { + return getFlags() & FlagNoReturn; + } + DIScopeRef getScope() const { return DIScopeRef(getRawScope()); } StringRef getName() const { return getStringOperand(2); } Index: include/llvm/Support/Dwarf.h =================================================================== --- include/llvm/Support/Dwarf.h +++ include/llvm/Support/Dwarf.h @@ -197,6 +197,7 @@ DW_AT_reference = 0x77, DW_AT_rvalue_reference = 0x78, DW_AT_macros = 0x79, + DW_AT_noreturn = 0x87, DW_AT_lo_user = 0x2000, DW_AT_hi_user = 0x3fff, Index: lib/CodeGen/AsmPrinter/DwarfUnit.cpp =================================================================== --- lib/CodeGen/AsmPrinter/DwarfUnit.cpp +++ lib/CodeGen/AsmPrinter/DwarfUnit.cpp @@ -1248,6 +1248,9 @@ if (SP->isRValueReference()) addFlag(SPDie, dwarf::DW_AT_rvalue_reference); + if (SP->isNoReturn()) + addFlag(SPDie, dwarf::DW_AT_noreturn); + if (SP->isProtected()) addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1, dwarf::DW_ACCESS_protected); Index: lib/Support/Dwarf.cpp =================================================================== --- lib/Support/Dwarf.cpp +++ lib/Support/Dwarf.cpp @@ -147,6 +147,7 @@ case DW_AT_dwo_name: return "DW_AT_dwo_name"; case DW_AT_reference: return "DW_AT_reference"; case DW_AT_rvalue_reference: return "DW_AT_rvalue_reference"; + case DW_AT_noreturn: return "DW_AT_noreturn"; case DW_AT_MIPS_loop_begin: return "DW_AT_MIPS_loop_begin"; case DW_AT_MIPS_tail_loop_begin: return "DW_AT_MIPS_tail_loop_begin"; case DW_AT_MIPS_epilog_begin: return "DW_AT_MIPS_epilog_begin"; Index: test/DebugInfo/noreturn_c11.ll =================================================================== --- /dev/null +++ test/DebugInfo/noreturn_c11.ll @@ -0,0 +1,50 @@ +; RUN: %llc_dwarf -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s +; REQUIRES: object-emission + +; Generated by clang -S -c -std=c++11 --emit-llvm -g from the following C11 source: +; _Noreturn void f() { +; throw 1; +; } + +; CHECK: DW_TAG_subprogram +; CHECK-NOT: DW_TAG +; CHECK: DW_AT_name{{.*}}"f" +; CHECK-NOT: DW_TAG +; CHECK: DW_AT_noreturn + +; ModuleID = './test.c' +source_filename = "./test.c" +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-unknown-linux-gnu" + +; Function Attrs: noreturn +define void @f() #0 !dbg !6 { +entry: + call void @exit(i32 0) #2, !dbg !10 + unreachable, !dbg !10 + +return: ; No predecessors! + ret void, !dbg !11 +} + +; Function Attrs: noreturn +declare void @exit(i32) #1 + +attributes #0 = { noreturn } + +!llvm.dbg.cu = !{!0} +!llvm.module.flags = !{!3, !4} +!llvm.ident = !{!5} + +!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 4.0.0 (http://llvm.org/git/clang.git 08946d46f2add8cb241fdc09fc3731dd9dc5ecb5) (http://llvm.org/git/llvm.git d048aeecd34b8c336d1fd44e36c15b0b11c2ea4d)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) +!1 = !DIFile(filename: "test.c", directory: "/home/del/test") +!2 = !{} +!3 = !{i32 2, !"Dwarf Version", i32 4} +!4 = !{i32 2, !"Debug Info Version", i32 3} +!5 = !{!"clang version 4.0.0 (http://llvm.org/git/clang.git 08946d46f2add8cb241fdc09fc3731dd9dc5ecb5) (http://llvm.org/git/llvm.git d048aeecd34b8c336d1fd44e36c15b0b11c2ea4d)"} +!6 = distinct !DISubprogram(name: "f", scope: !7, file: !7, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagNoReturn, isOptimized: false, unit: !0, variables: !2) +!7 = !DIFile(filename: "./test.c", directory: "/home/del/test") +!8 = !DISubroutineType(types: !9) +!9 = !{null} +!10 = !DILocation(line: 5, column: 3, scope: !6) +!11 = !DILocation(line: 6, column: 1, scope: !6) Index: test/DebugInfo/noreturn_cpp11.ll =================================================================== --- /dev/null +++ test/DebugInfo/noreturn_cpp11.ll @@ -0,0 +1,57 @@ +; RUN: %llc_dwarf -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s +; REQUIRES: object-emission + +; Generated by clang++ -S -c -std=c++11 --emit-llvm -g from the following C++11 source: +; [[ noreturn ]] void f() { +; throw 1; +; } + +; CHECK: DW_TAG_subprogram +; CHECK-NOT: DW_TAG +; CHECK: DW_AT_name{{.*}}"f" +; CHECK-NOT: DW_TAG +; CHECK: DW_AT_noreturn + +; ModuleID = 'test.cpp' +source_filename = "test.cpp" +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-unknown-linux-gnu" + +@_ZTIi = external constant i8* + +; Function Attrs: noreturn +define void @_Z1fv() #0 !dbg !6 { +entry: + %exception = call i8* @__cxa_allocate_exception(i64 4) #1, !dbg !9 + %0 = bitcast i8* %exception to i32*, !dbg !9 + store i32 1, i32* %0, align 16, !dbg !9 + call void @__cxa_throw(i8* %exception, i8* bitcast (i8** @_ZTIi to i8*), i8* null) #2, !dbg !10 + unreachable, !dbg !9 + +return: ; No predecessors! + ret void, !dbg !12 +} + +declare i8* @__cxa_allocate_exception(i64) + +declare void @__cxa_throw(i8*, i8*, i8*) + +attributes #0 = { noreturn } + +!llvm.dbg.cu = !{!0} +!llvm.module.flags = !{!3, !4} +!llvm.ident = !{!5} + +!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 4.0.0 (http://llvm.org/git/clang.git 08946d46f2add8cb241fdc09fc3731dd9dc5ecb5) (http://llvm.org/git/llvm.git d048aeecd34b8c336d1fd44e36c15b0b11c2ea4d)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) +!1 = !DIFile(filename: "test.cpp", directory: "/home/del/test") +!2 = !{} +!3 = !{i32 2, !"Dwarf Version", i32 4} +!4 = !{i32 2, !"Debug Info Version", i32 3} +!5 = !{!"clang version 4.0.0 (http://llvm.org/git/clang.git 08946d46f2add8cb241fdc09fc3731dd9dc5ecb5) (http://llvm.org/git/llvm.git d048aeecd34b8c336d1fd44e36c15b0b11c2ea4d)"} +!6 = distinct !DISubprogram(name: "f", linkageName: "_Z1fv", scope: !1, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped | DIFlagNoReturn, isOptimized: false, unit: !0, variables: !2) +!7 = !DISubroutineType(types: !8) +!8 = !{null} +!9 = !DILocation(line: 2, column: 5, scope: !6) +!10 = !DILocation(line: 2, column: 5, scope: !11) +!11 = !DILexicalBlockFile(scope: !6, file: !1, discriminator: 1) +!12 = !DILocation(line: 3, column: 1, scope: !6) Index: test/DebugInfo/noreturn_objc.ll =================================================================== --- /dev/null +++ test/DebugInfo/noreturn_objc.ll @@ -0,0 +1,52 @@ +; RUN: %llc_dwarf -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s +; REQUIRES: object-emission + +; Generated by clang++ -S -c --emit-llvm -g from the following ObjC source: +; #include +; __attribute__ ((noreturn)) void f() +; { +; exit(0); +; } + +; CHECK: DW_TAG_subprogram +; CHECK-NOT: DW_TAG +; CHECK: DW_AT_name{{.*}}"f" +; CHECK-NOT: DW_TAG +; CHECK: DW_AT_noreturn + +; ModuleID = './test.m' +source_filename = "./test.m" +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-unknown-linux-gnu" + +; Function Attrs: noreturn +define void @f() #0 !dbg !6 { +entry: + call void @exit(i32 0) #2, !dbg !10 + unreachable, !dbg !10 + +return: ; No predecessors! + ret void, !dbg !11 +} + +; Function Attrs: noreturn +declare void @exit(i32) #1 + +attributes #0 = { noreturn } + +!llvm.dbg.cu = !{!0} +!llvm.module.flags = !{!3, !4} +!llvm.ident = !{!5} + +!0 = distinct !DICompileUnit(language: DW_LANG_ObjC, file: !1, producer: "clang version 4.0.0 (http://llvm.org/git/clang.git 08946d46f2add8cb241fdc09fc3731dd9dc5ecb5) (http://llvm.org/git/llvm.git d048aeecd34b8c336d1fd44e36c15b0b11c2ea4d)", isOptimized: false, runtimeVersion: 1, emissionKind: FullDebug, enums: !2) +!1 = !DIFile(filename: "test.m", directory: "/home/del/test/noreturn/objc") +!2 = !{} +!3 = !{i32 2, !"Dwarf Version", i32 4} +!4 = !{i32 2, !"Debug Info Version", i32 3} +!5 = !{!"clang version 4.0.0 (http://llvm.org/git/clang.git 08946d46f2add8cb241fdc09fc3731dd9dc5ecb5) (http://llvm.org/git/llvm.git d048aeecd34b8c336d1fd44e36c15b0b11c2ea4d)"} +!6 = distinct !DISubprogram(name: "f", scope: !7, file: !7, line: 2, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagNoReturn, isOptimized: false, unit: !0, variables: !2) +!7 = !DIFile(filename: "./test.m", directory: "/home/del/test/noreturn/objc") +!8 = !DISubroutineType(types: !9) +!9 = !{null} +!10 = !DILocation(line: 4, column: 3, scope: !6) +!11 = !DILocation(line: 5, column: 1, scope: !6) Index: unittests/IR/DebugInfoTest.cpp =================================================================== --- unittests/IR/DebugInfoTest.cpp +++ unittests/IR/DebugInfoTest.cpp @@ -73,8 +73,9 @@ CHECK_SPLIT(DINode::FlagRValueReference, {DINode::FlagRValueReference}, 0u); unsigned Flags[] = {DINode::FlagFwdDecl, DINode::FlagVector}; CHECK_SPLIT(DINode::FlagFwdDecl | DINode::FlagVector, Flags, 0u); - CHECK_SPLIT(0x100000u, {}, 0x100000u); - CHECK_SPLIT(0x100000u | DINode::FlagVector, {DINode::FlagVector}, 0x100000u); + CHECK_SPLIT(0x200000u, {}, 0x200000u); + CHECK_SPLIT(0x200000u | DINode::FlagVector, {DINode::FlagVector}, 0x200000u); + CHECK_SPLIT(0x200000u | DINode::FlagNoReturn, {DINode::FlagNoReturn}, 0x200000u); #undef CHECK_SPLIT }