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Add LLVM IR debug info support for Fortran COMMON blocks 

COMMON blocks are a feature of Fortran that has no direct analog in C languages, but they are similar to data sections in assembly language programming. A COMMON block is a named area of memory that holds a collection of variables. Fortran subprograms may map the COMMON block memory area to their own, possibly distinct, non-empty list of variables. A Fortran COMMON block might look like the following example.

    COMMON /ALPHA/ I, J

    For this construct, the compiler generates a new scope-like DI construct (!DICommonBlock) into which variables (see I, J above) can be placed. As the common block implies a range of storage with global lifetime, the !DICommonBlock refers to a !DIGlobalVariable. The Fortran variable that comprise the COMMON block are also linked via metadata to offsets within the global variable that stands for the entire common block.

    @alpha_ = common global %alphabytes_ zeroinitializer, align 64, !dbg !27, !dbg !30, !dbg !33
    !14 = distinct !DISubprogram(…)
    !20 = distinct !DICommonBlock(scope: !14, declaration: !25, name: "alpha")
    !25 = distinct !DIGlobalVariable(scope: !20, name: "common alpha", type: !24)
    !27 = !DIGlobalVariableExpression(var: !25, expr: !DIExpression())
    !29 = distinct !DIGlobalVariable(scope: !20, name: "i", file: !3, type: !28)
    !30 = !DIGlobalVariableExpression(var: !29, expr: !DIExpression())
    !31 = distinct !DIGlobalVariable(scope: !20, name: "j", file: !3, type: !28)
    !32 = !DIExpression(DW_OP_plus_uconst, 4)
    !33 = !DIGlobalVariableExpression(var: !31, expr: !32)

    The DWARF generated for this is as follows.

    DW_TAG_common_block:
    DW_AT_name: alpha
    DW_AT_location: @alpha_+0
    DW_TAG_variable:
    DW_AT_name: common alpha
    DW_AT_type: array of 8 bytes
    DW_AT_location: @alpha_+0
    DW_TAG_variable:
    DW_AT_name: i
    DW_AT_type: integer*4
    DW_AT_location: @Alpha+0
    DW_TAG_variable:
    DW_AT_name: j
    DW_AT_type: integer*4
    DW_AT_location: @Alpha+4

Patch by Eric Schweitz!

Differential Revision: https://reviews.llvm.org/D54327

llvm-svn: 357934
This commit is contained in:
Adrian Prantl 2019-04-08 19:13:55 +00:00
parent 6cf7b715a0
commit 6ed5706a2b
18 changed files with 293 additions and 5 deletions
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3
llvm/include/llvm-c/DebugInfo.h
View File

@ -159,7 +159,8 @@ enum {
LLVMDIObjCPropertyMetadataKind,
LLVMDIImportedEntityMetadataKind,
LLVMDIMacroMetadataKind,
LLVMDIMacroFileMetadataKind
LLVMDIMacroFileMetadataKind,
LLVMDICommonBlockMetadataKind
};
typedef unsigned LLVMMetadataKind;

1
llvm/include/llvm/Bitcode/LLVMBitCodes.h
View File

@ -310,6 +310,7 @@ enum MetadataCodes {
METADATA_INDEX_OFFSET = 38, // [offset]
METADATA_INDEX = 39, // [bitpos]
METADATA_LABEL = 40, // [distinct, scope, name, file, line]
METADATA_COMMON_BLOCK = 44, // [distinct, scope, name, variable,...]
};
// The constants block (CONSTANTS_BLOCK_ID) describes emission for each

10
llvm/include/llvm/IR/DIBuilder.h
View File

@ -706,6 +706,16 @@ namespace llvm {
DITemplateParameterArray TParams = nullptr,
DITypeArray ThrownTypes = nullptr);
/// Create common block entry for a Fortran common block
/// \param Scope Scope of this common block
/// \param Name The name of this common block
/// \param File The file this common block is defined
/// \param LineNo Line number
/// \param VarList List of variables that a located in common block
DICommonBlock *createCommonBlock(DIScope *Scope, DIGlobalVariable *decl,
StringRef Name, DIFile *File,
unsigned LineNo);
/// This creates new descriptor for a namespace with the specified
/// parent scope.
/// \param Scope Namespace scope

61
llvm/include/llvm/IR/DebugInfoMetadata.h
View File

@ -227,6 +227,7 @@ public:
case DILexicalBlockKind:
case DILexicalBlockFileKind:
case DINamespaceKind:
case DICommonBlockKind:
case DITemplateTypeParameterKind:
case DITemplateValueParameterKind:
case DIGlobalVariableKind:
@ -485,6 +486,7 @@ public:
case DILexicalBlockKind:
case DILexicalBlockFileKind:
case DINamespaceKind:
case DICommonBlockKind:
case DIModuleKind:
return true;
}
@ -2673,6 +2675,65 @@ public:
}
};
class DICommonBlock : public DIScope {
unsigned LineNo;
friend class LLVMContextImpl;
friend class MDNode;
DICommonBlock(LLVMContext &Context, StorageType Storage, unsigned LineNo,
ArrayRef<Metadata *> Ops)
: DIScope(Context, DICommonBlockKind, Storage, dwarf::DW_TAG_common_block,
Ops), LineNo(LineNo) {}
static DICommonBlock *getImpl(LLVMContext &Context, DIScope *Scope,
DIGlobalVariable *Decl, StringRef Name,
DIFile *File, unsigned LineNo,
StorageType Storage,
bool ShouldCreate = true) {
return getImpl(Context, Scope, Decl, getCanonicalMDString(Context, Name),
File, LineNo, Storage, ShouldCreate);
}
static DICommonBlock *getImpl(LLVMContext &Context, Metadata *Scope,
Metadata *Decl, MDString *Name, Metadata *File,
unsigned LineNo,
StorageType Storage, bool ShouldCreate = true);
TempDICommonBlock cloneImpl() const {
return getTemporary(getContext(), getScope(), getDecl(), getName(),
getFile(), getLineNo());
}
public:
DEFINE_MDNODE_GET(DICommonBlock,
(DIScope *Scope, DIGlobalVariable *Decl, StringRef Name,
DIFile *File, unsigned LineNo),
(Scope, Decl, Name, File, LineNo))
DEFINE_MDNODE_GET(DICommonBlock,
(Metadata *Scope, Metadata *Decl, MDString *Name,
Metadata *File, unsigned LineNo),
(Scope, Decl, Name, File, LineNo))
TempDICommonBlock clone() const { return cloneImpl(); }
DIScope *getScope() const { return cast_or_null<DIScope>(getRawScope()); }
DIGlobalVariable *getDecl() const {
return cast_or_null<DIGlobalVariable>(getRawDecl());
}
StringRef getName() const { return getStringOperand(2); }
DIFile *getFile() const { return cast_or_null<DIFile>(getRawFile()); }
unsigned getLineNo() const { return LineNo; }
Metadata *getRawScope() const { return getOperand(0); }
Metadata *getRawDecl() const { return getOperand(1); }
MDString *getRawName() const { return getOperandAs<MDString>(2); }
Metadata *getRawFile() const { return getOperand(3); }
static bool classof(const Metadata *MD) {
return MD->getMetadataID() == DICommonBlockKind;
}
};
/// Local variable.
///
/// TODO: Split up flags.

1
llvm/include/llvm/IR/Metadata.def
View File

@ -113,6 +113,7 @@ HANDLE_SPECIALIZED_MDNODE_LEAF_UNIQUABLE(DIImportedEntity)
HANDLE_SPECIALIZED_MDNODE_BRANCH(DIMacroNode)
HANDLE_SPECIALIZED_MDNODE_LEAF_UNIQUABLE(DIMacro)
HANDLE_SPECIALIZED_MDNODE_LEAF_UNIQUABLE(DIMacroFile)
HANDLE_SPECIALIZED_MDNODE_LEAF_UNIQUABLE(DICommonBlock)
#undef HANDLE_METADATA
#undef HANDLE_METADATA_LEAF

18
llvm/lib/AsmParser/LLParser.cpp
View File

@ -4664,6 +4664,24 @@ bool LLParser::ParseDILexicalBlockFile(MDNode *&Result, bool IsDistinct) {
return false;
}
/// ParseDICommonBlock:
/// ::= !DICommonBlock(scope: !0, file: !2, name: "COMMON name", line: 9)
bool LLParser::ParseDICommonBlock(MDNode *&Result, bool IsDistinct) {
#define VISIT_MD_FIELDS(OPTIONAL, REQUIRED) \
REQUIRED(scope, MDField, ); \
OPTIONAL(declaration, MDField, ); \
OPTIONAL(name, MDStringField, ); \
OPTIONAL(file, MDField, ); \
OPTIONAL(line, LineField, );
PARSE_MD_FIELDS();
#undef VISIT_MD_FIELDS
Result = GET_OR_DISTINCT(DICommonBlock,
(Context, scope.Val, declaration.Val, name.Val,
file.Val, line.Val));
return false;
}
/// ParseDINamespace:
/// ::= !DINamespace(scope: !0, file: !2, name: "SomeNamespace", line: 9)
bool LLParser::ParseDINamespace(MDNode *&Result, bool IsDistinct) {

12
llvm/lib/Bitcode/Reader/MetadataLoader.cpp
View File

@ -811,6 +811,7 @@ MetadataLoader::MetadataLoaderImpl::lazyLoadModuleMetadataBlock() {
case bitc::METADATA_LEXICAL_BLOCK:
case bitc::METADATA_LEXICAL_BLOCK_FILE:
case bitc::METADATA_NAMESPACE:
case bitc::METADATA_COMMON_BLOCK:
case bitc::METADATA_MACRO:
case bitc::METADATA_MACRO_FILE:
case bitc::METADATA_TEMPLATE_TYPE:
@ -1528,6 +1529,17 @@ Error MetadataLoader::MetadataLoaderImpl::parseOneMetadata(
NextMetadataNo++;
break;
}
case bitc::METADATA_COMMON_BLOCK: {
IsDistinct = Record[0] & 1;
MetadataList.assignValue(
GET_OR_DISTINCT(DICommonBlock,
(Context, getMDOrNull(Record[1]),
getMDOrNull(Record[2]), getMDString(Record[3]),
getMDOrNull(Record[4]), Record[5])),
NextMetadataNo);
NextMetadataNo++;
break;
}
case bitc::METADATA_NAMESPACE: {
// Newer versions of DINamespace dropped file and line.
MDString *Name;

16
llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
View File

@ -317,6 +317,8 @@ private:
void writeDILexicalBlockFile(const DILexicalBlockFile *N,
SmallVectorImpl<uint64_t> &Record,
unsigned Abbrev);
void writeDICommonBlock(const DICommonBlock *N,
SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
void writeDINamespace(const DINamespace *N, SmallVectorImpl<uint64_t> &Record,
unsigned Abbrev);
void writeDIMacro(const DIMacro *N, SmallVectorImpl<uint64_t> &Record,
@ -1686,6 +1688,20 @@ void ModuleBitcodeWriter::writeDILexicalBlockFile(
Record.clear();
}
void ModuleBitcodeWriter::writeDICommonBlock(const DICommonBlock *N,
SmallVectorImpl<uint64_t> &Record,
unsigned Abbrev) {
Record.push_back(N->isDistinct());
Record.push_back(VE.getMetadataOrNullID(N->getScope()));
Record.push_back(VE.getMetadataOrNullID(N->getDecl()));
Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
Record.push_back(VE.getMetadataOrNullID(N->getFile()));
Record.push_back(N->getLineNo());
Stream.EmitRecord(bitc::METADATA_COMMON_BLOCK, Record, Abbrev);
Record.clear();
}
void ModuleBitcodeWriter::writeDINamespace(const DINamespace *N,
SmallVectorImpl<uint64_t> &Record,
unsigned Abbrev) {

30
llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
View File

@ -123,7 +123,9 @@ DIE *DwarfCompileUnit::getOrCreateGlobalVariableDIE(
// Construct the context before querying for the existence of the DIE in
// case such construction creates the DIE.
DIE *ContextDIE = getOrCreateContextDIE(GVContext);
auto *CB = GVContext ? dyn_cast<DICommonBlock>(GVContext) : nullptr;
DIE *ContextDIE = CB ? getOrCreateCommonBlock(CB, GlobalExprs)
: getOrCreateContextDIE(GVContext);
// Add to map.
DIE *VariableDIE = &createAndAddDIE(GV->getTag(), *ContextDIE, GV);
@ -166,6 +168,13 @@ DIE *DwarfCompileUnit::getOrCreateGlobalVariableDIE(
addTemplateParams(*VariableDIE, DINodeArray(TP));
// Add location.
addLocationAttribute(VariableDIE, GV, GlobalExprs);
return VariableDIE;
}
void DwarfCompileUnit::addLocationAttribute(
DIE *VariableDIE, const DIGlobalVariable *GV, ArrayRef<GlobalExpr> GlobalExprs) {
bool addToAccelTable = false;
DIELoc *Loc = nullptr;
Optional<unsigned> NVPTXAddressSpace;
@ -288,8 +297,25 @@ DIE *DwarfCompileUnit::getOrCreateGlobalVariableDIE(
DD->useAllLinkageNames())
DD->addAccelName(*CUNode, GV->getLinkageName(), *VariableDIE);
}
}
return VariableDIE;
DIE *DwarfCompileUnit::getOrCreateCommonBlock(
const DICommonBlock *CB, ArrayRef<GlobalExpr> GlobalExprs) {
// Construct the context before querying for the existence of the DIE in case
// such construction creates the DIE.
DIE *ContextDIE = getOrCreateContextDIE(CB->getScope());
if (DIE *NDie = getDIE(CB))
return NDie;
DIE &NDie = createAndAddDIE(dwarf::DW_TAG_common_block, *ContextDIE, CB);
StringRef Name = CB->getName().empty() ? "_BLNK_" : CB->getName();
addString(NDie, dwarf::DW_AT_name, Name);
addGlobalName(Name, NDie, CB->getScope());
if (CB->getFile())
addSourceLine(NDie, CB->getLineNo(), CB->getFile());
if (DIGlobalVariable *V = CB->getDecl())
getCU().addLocationAttribute(&NDie, V, GlobalExprs);
return &NDie;
}
void DwarfCompileUnit::addRange(RangeSpan Range) {

6
llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
View File

@ -139,6 +139,12 @@ public:
getOrCreateGlobalVariableDIE(const DIGlobalVariable *GV,
ArrayRef<GlobalExpr> GlobalExprs);
DIE *getOrCreateCommonBlock(const DICommonBlock *CB,
ArrayRef<GlobalExpr> GlobalExprs);
void addLocationAttribute(DIE *ToDIE, const DIGlobalVariable *GV,
ArrayRef<GlobalExpr> GlobalExprs);
/// addLabelAddress - Add a dwarf label attribute data and value using
/// either DW_FORM_addr or DW_FORM_GNU_addr_index.
void addLabelAddress(DIE &Die, dwarf::Attribute Attribute,

2
llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
View File

@ -689,7 +689,7 @@ void DwarfUnit::updateAcceleratorTables(const DIScope *Context,
DD->addAccelType(*CUNode, Ty->getName(), TyDIE, Flags);
if (!Context || isa<DICompileUnit>(Context) || isa<DIFile>(Context) ||
isa<DINamespace>(Context))
isa<DINamespace>(Context) || isa<DICommonBlock>(Context))
addGlobalType(Ty, TyDIE, Context);
}
}

13
llvm/lib/IR/AsmWriter.cpp
View File

@ -2001,6 +2001,19 @@ static void writeDINamespace(raw_ostream &Out, const DINamespace *N,
Out << ")";
}
static void writeDICommonBlock(raw_ostream &Out, const DICommonBlock *N,
TypePrinting *TypePrinter, SlotTracker *Machine,
const Module *Context) {
Out << "!DICommonBlock(";
MDFieldPrinter Printer(Out, TypePrinter, Machine, Context);
Printer.printMetadata("scope", N->getRawScope(), false);
Printer.printMetadata("declaration", N->getRawDecl(), false);
Printer.printString("name", N->getName());
Printer.printMetadata("file", N->getRawFile());
Printer.printInt("line", N->getLineNo());
Out << ")";
}
static void writeDIMacro(raw_ostream &Out, const DIMacro *N,
TypePrinting *TypePrinter, SlotTracker *Machine,
const Module *Context) {

7
llvm/lib/IR/DIBuilder.cpp
View File

@ -805,6 +805,13 @@ DISubprogram *DIBuilder::createMethod(
return SP;
}
DICommonBlock *DIBuilder::createCommonBlock(
DIScope *Scope, DIGlobalVariable *Decl, StringRef Name, DIFile *File,
unsigned LineNo) {
return DICommonBlock::get(
VMContext, Scope, Decl, Name, File, LineNo);
}
DINamespace *DIBuilder::createNameSpace(DIScope *Scope, StringRef Name,
bool ExportSymbols) {

16
llvm/lib/IR/DebugInfoMetadata.cpp
View File

@ -222,6 +222,9 @@ DIScopeRef DIScope::getScope() const {
if (auto *NS = dyn_cast<DINamespace>(this))
return NS->getScope();
if (auto *CB = dyn_cast<DICommonBlock>(this))
return CB->getScope();
if (auto *M = dyn_cast<DIModule>(this))
return M->getScope();
@ -237,6 +240,8 @@ StringRef DIScope::getName() const {
return SP->getName();
if (auto *NS = dyn_cast<DINamespace>(this))
return NS->getName();
if (auto *CB = dyn_cast<DICommonBlock>(this))
return CB->getName();
if (auto *M = dyn_cast<DIModule>(this))
return M->getName();
assert((isa<DILexicalBlockBase>(this) || isa<DIFile>(this) ||
@ -694,6 +699,17 @@ DINamespace *DINamespace::getImpl(LLVMContext &Context, Metadata *Scope,
DEFINE_GETIMPL_STORE(DINamespace, (ExportSymbols), Ops);
}
DICommonBlock *DICommonBlock::getImpl(LLVMContext &Context, Metadata *Scope,
Metadata *Decl, MDString *Name,
Metadata *File, unsigned LineNo,
StorageType Storage, bool ShouldCreate) {
assert(isCanonical(Name) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DICommonBlock, (Scope, Decl, Name, File, LineNo));
// The nullptr is for DIScope's File operand. This should be refactored.
Metadata *Ops[] = {Scope, Decl, Name, File};
DEFINE_GETIMPL_STORE(DICommonBlock, (LineNo), Ops);
}
DIModule *DIModule::getImpl(LLVMContext &Context, Metadata *Scope,
MDString *Name, MDString *ConfigurationMacros,
MDString *IncludePath, MDString *ISysRoot,

25
llvm/lib/IR/LLVMContextImpl.h
View File

@ -789,6 +789,31 @@ template <> struct MDNodeKeyImpl<DINamespace> {
}
};
template <> struct MDNodeKeyImpl<DICommonBlock> {
Metadata *Scope;
Metadata *Decl;
MDString *Name;
Metadata *File;
unsigned LineNo;
MDNodeKeyImpl(Metadata *Scope, Metadata *Decl, MDString *Name,
Metadata *File, unsigned LineNo)
: Scope(Scope), Decl(Decl), Name(Name), File(File), LineNo(LineNo) {}
MDNodeKeyImpl(const DICommonBlock *N)
: Scope(N->getRawScope()), Decl(N->getRawDecl()), Name(N->getRawName()),
File(N->getRawFile()), LineNo(N->getLineNo()) {}
bool isKeyOf(const DICommonBlock *RHS) const {
return Scope == RHS->getRawScope() && Decl == RHS->getRawDecl() &&
Name == RHS->getRawName() && File == RHS->getRawFile() &&
LineNo == RHS->getLineNo();
}
unsigned getHashValue() const {
return hash_combine(Scope, Decl, Name, File, LineNo);
}
};
template <> struct MDNodeKeyImpl<DIModule> {
Metadata *Scope;
MDString *Name;

9
llvm/lib/IR/Verifier.cpp
View File

@ -1156,6 +1156,14 @@ void Verifier::visitDILexicalBlockFile(const DILexicalBlockFile &N) {
visitDILexicalBlockBase(N);
}
void Verifier::visitDICommonBlock(const DICommonBlock &N) {
AssertDI(N.getTag() == dwarf::DW_TAG_common_block, "invalid tag", &N);
if (auto *S = N.getRawScope())
AssertDI(isa<DIScope>(S), "invalid scope ref", &N, S);
if (auto *S = N.getRawDecl())
AssertDI(isa<DIGlobalVariable>(S), "invalid declaration", &N, S);
}
void Verifier::visitDINamespace(const DINamespace &N) {
AssertDI(N.getTag() == dwarf::DW_TAG_namespace, "invalid tag", &N);
if (auto *S = N.getRawScope())
@ -1224,7 +1232,6 @@ void Verifier::visitDIGlobalVariable(const DIGlobalVariable &N) {
visitDIVariable(N);
AssertDI(N.getTag() == dwarf::DW_TAG_variable, "invalid tag", &N);
AssertDI(!N.getName().empty(), "missing global variable name", &N);
AssertDI(isType(N.getRawType()), "invalid type ref", &N, N.getRawType());
AssertDI(N.getType(), "missing global variable type", &N);
if (auto *Member = N.getRawStaticDataMemberDeclaration()) {

26
llvm/test/Assembler/DICommonBlock.ll Normal file
View File

@ -0,0 +1,26 @@
; RUN: llvm-as < %s | llvm-dis | llvm-as | llvm-dis | FileCheck %s
; CHECK-DAG: [[MD:![0-9]+]] = !DICommonBlock({{.*}}name: "a"
; CHECK-DAG: !DIGlobalVariable({{.*}}name: "c",{{.*}}scope: [[MD]]
@common_a = common global [32 x i8] zeroinitializer, align 8, !dbg !13, !dbg !15
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!6, !7}
!llvm.ident = !{!8}
!0 = distinct !DICompileUnit(language: DW_LANG_Fortran90, file: !1, producer: "PGI Fortran", isOptimized: false, runtimeVersion: 2, emissionKind: FullDebug, retainedTypes: !14, globals: !3)
!1 = !DIFile(filename: "none.f90", directory: "/not/here/")
!2 = distinct !DIGlobalVariable(scope: !5, name: "c", file: !1, type: !12, isDefinition: true)
!3 = !{!13, !15}
!4 = distinct !DIGlobalVariable(scope: !5, name: "COMMON /foo/", file: !1, line: 4, isLocal: false, isDefinition: true, type: !12)
!5 = !DICommonBlock(scope: !9, declaration: !4, name: "a", file: !1, line: 4)
!6 = !{i32 2, !"Dwarf Version", i32 4}
!7 = !{i32 2, !"Debug Info Version", i32 3}
!8 = !{!"PGI Fortran"}
!9 = distinct !DISubprogram(name: "subrtn", scope: !0, file: !1, line: 1, type: !10, isLocal: false, isDefinition: true, unit: !0)
!10 = !DISubroutineType(types: !11)
!11 = !{!12, !12}
!12 = !DIBasicType(name: "int", size: 32)
!13 = !DIGlobalVariableExpression(var: !4, expr: !DIExpression())
!14 = !{!12, !10}
!15 = !DIGlobalVariableExpression(var: !2, expr: !DIExpression(DW_OP_plus_uconst, 4))

42
llvm/test/DebugInfo/Generic/DICommonBlock.ll Normal file
View File

@ -0,0 +1,42 @@
; REQUIRES: object-emission
; RUN: %llc_dwarf -O0 -filetype=obj < %s > %t
; RUN: llvm-dwarfdump -debug-info %t | FileCheck %s
; CHECK: DW_TAG_common_block
; CHECK-DAG: DW_AT_name{{.*}}"a"
; CHECK-DAG: DW_AT_location
; CHECK: DW_TAG_variable
; CHECK-DAG: DW_AT_name{{.*}}"c"
; CHECK-DAG: DW_AT_location{{.*}}DW_OP_plus_uconst{{.*}}4
; CHECK: {{DW_TAG|NULL}}
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
@common_a = common global [32 x i8] zeroinitializer, align 8, !dbg !13, !dbg !15
define i32 @subr() !dbg !9 {
%1 = getelementptr inbounds [32 x i8], [32 x i8]* @common_a, i64 0, i32 8
%2 = bitcast i8* %1 to i32*
%3 = load i32, i32* %2
ret i32 %3
}
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!6, !7}
!llvm.ident = !{!8}
!0 = distinct !DICompileUnit(language: DW_LANG_Fortran90, file: !1, producer: "PGI Fortran", isOptimized: false, runtimeVersion: 2, emissionKind: FullDebug, retainedTypes: !14, globals: !3)
!1 = !DIFile(filename: "none.f90", directory: "/not/here/")
!2 = distinct !DIGlobalVariable(scope: !5, name: "c", file: !1, type: !12, isDefinition: true)
!3 = !{!13, !15}
!4 = distinct !DIGlobalVariable(scope: !5, name: "COMMON /foo/", file: !1, line: 4, isLocal: false, isDefinition: true, type: !12)
!5 = !DICommonBlock(scope: !9, declaration: !4, name: "a", file: !1, line: 4)
!6 = !{i32 2, !"Dwarf Version", i32 4}
!7 = !{i32 2, !"Debug Info Version", i32 3}
!8 = !{!"PGI Fortran"}
!9 = distinct !DISubprogram(name: "s", scope: !0, file: !1, line: 1, type: !10, isLocal: false, isDefinition: true, unit: !0)
!10 = !DISubroutineType(types: !11)
!11 = !{!12, !12}
!12 = !DIBasicType(name: "int", size: 32)
!13 = !DIGlobalVariableExpression(var: !4, expr: !DIExpression())
!14 = !{!12, !10}
!15 = !DIGlobalVariableExpression(var: !2, expr: !DIExpression(DW_OP_plus_uconst, 4))