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LLParser.cpp
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//===-- LLParser.cpp - Parser Class ---------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the parser class for .ll files.
//
//===----------------------------------------------------------------------===//
#include "LLParser.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/AsmParser/SlotMapping.h"
#include "llvm/IR/AutoUpgrade.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Operator.h"
#include "llvm/IR/ValueSymbolTable.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/SaveAndRestore.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
static std::string getTypeString(Type *T) {
std::string Result;
raw_string_ostream Tmp(Result);
Tmp << *T;
return Tmp.str();
}
/// Run: module ::= toplevelentity*
bool LLParser::Run() {
// Prime the lexer.
Lex.Lex();
if (Context.shouldDiscardValueNames())
return Error(
Lex.getLoc(),
"Can't read textual IR with a Context that discards named Values");
return ParseTopLevelEntities() ||
ValidateEndOfModule();
}
bool LLParser::parseStandaloneConstantValue(Constant *&C,
const SlotMapping *Slots) {
restoreParsingState(Slots);
Lex.Lex();
Type *Ty = nullptr;
if (ParseType(Ty) || parseConstantValue(Ty, C))
return true;
if (Lex.getKind() != lltok::Eof)
return Error(Lex.getLoc(), "expected end of string");
return false;
}
bool LLParser::parseTypeAtBeginning(Type *&Ty, unsigned &Read,
const SlotMapping *Slots) {
restoreParsingState(Slots);
Lex.Lex();
Read = 0;
SMLoc Start = Lex.getLoc();
Ty = nullptr;
if (ParseType(Ty))
return true;
SMLoc End = Lex.getLoc();
Read = End.getPointer() - Start.getPointer();
return false;
}
void LLParser::restoreParsingState(const SlotMapping *Slots) {
if (!Slots)
return;
NumberedVals = Slots->GlobalValues;
NumberedMetadata = Slots->MetadataNodes;
for (const auto &I : Slots->NamedTypes)
NamedTypes.insert(
std::make_pair(I.getKey(), std::make_pair(I.second, LocTy())));
for (const auto &I : Slots->Types)
NumberedTypes.insert(
std::make_pair(I.first, std::make_pair(I.second, LocTy())));
}
/// ValidateEndOfModule - Do final validity and sanity checks at the end of the
/// module.
bool LLParser::ValidateEndOfModule() {
// Handle any function attribute group forward references.
for (std::map<Value*, std::vector<unsigned> >::iterator
I = ForwardRefAttrGroups.begin(), E = ForwardRefAttrGroups.end();
I != E; ++I) {
Value *V = I->first;
std::vector<unsigned> &Vec = I->second;
AttrBuilder B;
for (std::vector<unsigned>::iterator VI = Vec.begin(), VE = Vec.end();
VI != VE; ++VI)
B.merge(NumberedAttrBuilders[*VI]);
if (Function *Fn = dyn_cast<Function>(V)) {
AttributeSet AS = Fn->getAttributes();
AttrBuilder FnAttrs(AS.getFnAttributes(), AttributeSet::FunctionIndex);
AS = AS.removeAttributes(Context, AttributeSet::FunctionIndex,
AS.getFnAttributes());
FnAttrs.merge(B);
// If the alignment was parsed as an attribute, move to the alignment
// field.
if (FnAttrs.hasAlignmentAttr()) {
Fn->setAlignment(FnAttrs.getAlignment());
FnAttrs.removeAttribute(Attribute::Alignment);
}
AS = AS.addAttributes(Context, AttributeSet::FunctionIndex,
AttributeSet::get(Context,
AttributeSet::FunctionIndex,
FnAttrs));
Fn->setAttributes(AS);
} else if (CallInst *CI = dyn_cast<CallInst>(V)) {
AttributeSet AS = CI->getAttributes();
AttrBuilder FnAttrs(AS.getFnAttributes(), AttributeSet::FunctionIndex);
AS = AS.removeAttributes(Context, AttributeSet::FunctionIndex,
AS.getFnAttributes());
FnAttrs.merge(B);
AS = AS.addAttributes(Context, AttributeSet::FunctionIndex,
AttributeSet::get(Context,
AttributeSet::FunctionIndex,
FnAttrs));
CI->setAttributes(AS);
} else if (InvokeInst *II = dyn_cast<InvokeInst>(V)) {
AttributeSet AS = II->getAttributes();
AttrBuilder FnAttrs(AS.getFnAttributes(), AttributeSet::FunctionIndex);
AS = AS.removeAttributes(Context, AttributeSet::FunctionIndex,
AS.getFnAttributes());
FnAttrs.merge(B);
AS = AS.addAttributes(Context, AttributeSet::FunctionIndex,
AttributeSet::get(Context,
AttributeSet::FunctionIndex,
FnAttrs));
II->setAttributes(AS);
} else {
llvm_unreachable("invalid object with forward attribute group reference");
}
}
// If there are entries in ForwardRefBlockAddresses at this point, the
// function was never defined.
if (!ForwardRefBlockAddresses.empty())
return Error(ForwardRefBlockAddresses.begin()->first.Loc,
"expected function name in blockaddress");
for (const auto &NT : NumberedTypes)
if (NT.second.second.isValid())
return Error(NT.second.second,
"use of undefined type '%" + Twine(NT.first) + "'");
for (StringMap<std::pair<Type*, LocTy> >::iterator I =
NamedTypes.begin(), E = NamedTypes.end(); I != E; ++I)
if (I->second.second.isValid())
return Error(I->second.second,
"use of undefined type named '" + I->getKey() + "'");
if (!ForwardRefComdats.empty())
return Error(ForwardRefComdats.begin()->second,
"use of undefined comdat '$" +
ForwardRefComdats.begin()->first + "'");
if (!ForwardRefVals.empty())
return Error(ForwardRefVals.begin()->second.second,
"use of undefined value '@" + ForwardRefVals.begin()->first +
"'");
if (!ForwardRefValIDs.empty())
return Error(ForwardRefValIDs.begin()->second.second,
"use of undefined value '@" +
Twine(ForwardRefValIDs.begin()->first) + "'");
if (!ForwardRefMDNodes.empty())
return Error(ForwardRefMDNodes.begin()->second.second,
"use of undefined metadata '!" +
Twine(ForwardRefMDNodes.begin()->first) + "'");
// Resolve metadata cycles.
for (auto &N : NumberedMetadata) {
if (N.second && !N.second->isResolved())
N.second->resolveCycles();
}
for (unsigned I = 0, E = InstsWithTBAATag.size(); I < E; I++)
UpgradeInstWithTBAATag(InstsWithTBAATag[I]);
// Look for intrinsic functions and CallInst that need to be upgraded
for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; )
UpgradeCallsToIntrinsic(&*FI++); // must be post-increment, as we remove
// Some types could be renamed during loading if several modules are
// loaded in the same LLVMContext (LTO scenario). In this case we should
// remangle intrinsics names as well.
for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ) {
Function *F = &*FI++;
if (auto Remangled = Intrinsic::remangleIntrinsicFunction(F)) {
F->replaceAllUsesWith(Remangled.getValue());
F->eraseFromParent();
}
}
UpgradeDebugInfo(*M);
UpgradeModuleFlags(*M);
if (!Slots)
return false;
// Initialize the slot mapping.
// Because by this point we've parsed and validated everything, we can "steal"
// the mapping from LLParser as it doesn't need it anymore.
Slots->GlobalValues = std::move(NumberedVals);
Slots->MetadataNodes = std::move(NumberedMetadata);
for (const auto &I : NamedTypes)
Slots->NamedTypes.insert(std::make_pair(I.getKey(), I.second.first));
for (const auto &I : NumberedTypes)
Slots->Types.insert(std::make_pair(I.first, I.second.first));
return false;
}
//===----------------------------------------------------------------------===//
// Top-Level Entities
//===----------------------------------------------------------------------===//
bool LLParser::ParseTopLevelEntities() {
while (1) {
switch (Lex.getKind()) {
default: return TokError("expected top-level entity");
case lltok::Eof: return false;
case lltok::kw_declare: if (ParseDeclare()) return true; break;
case lltok::kw_define: if (ParseDefine()) return true; break;
case lltok::kw_module: if (ParseModuleAsm()) return true; break;
case lltok::kw_target: if (ParseTargetDefinition()) return true; break;
case lltok::kw_source_filename:
if (ParseSourceFileName())
return true;
break;
case lltok::kw_deplibs: if (ParseDepLibs()) return true; break;
case lltok::LocalVarID: if (ParseUnnamedType()) return true; break;
case lltok::LocalVar: if (ParseNamedType()) return true; break;
case lltok::GlobalID: if (ParseUnnamedGlobal()) return true; break;
case lltok::GlobalVar: if (ParseNamedGlobal()) return true; break;
case lltok::ComdatVar: if (parseComdat()) return true; break;
case lltok::exclaim: if (ParseStandaloneMetadata()) return true; break;
case lltok::MetadataVar:if (ParseNamedMetadata()) return true; break;
case lltok::kw_attributes: if (ParseUnnamedAttrGrp()) return true; break;
case lltok::kw_uselistorder: if (ParseUseListOrder()) return true; break;
case lltok::kw_uselistorder_bb:
if (ParseUseListOrderBB()) return true; break;
}
}
}
/// toplevelentity
/// ::= 'module' 'asm' STRINGCONSTANT
bool LLParser::ParseModuleAsm() {
assert(Lex.getKind() == lltok::kw_module);
Lex.Lex();
std::string AsmStr;
if (ParseToken(lltok::kw_asm, "expected 'module asm'") ||
ParseStringConstant(AsmStr)) return true;
M->appendModuleInlineAsm(AsmStr);
return false;
}
/// toplevelentity
/// ::= 'target' 'triple' '=' STRINGCONSTANT
/// ::= 'target' 'datalayout' '=' STRINGCONSTANT
bool LLParser::ParseTargetDefinition() {
assert(Lex.getKind() == lltok::kw_target);
std::string Str;
switch (Lex.Lex()) {
default: return TokError("unknown target property");
case lltok::kw_triple:
Lex.Lex();
if (ParseToken(lltok::equal, "expected '=' after target triple") ||
ParseStringConstant(Str))
return true;
M->setTargetTriple(Str);
return false;
case lltok::kw_datalayout:
Lex.Lex();
if (ParseToken(lltok::equal, "expected '=' after target datalayout") ||
ParseStringConstant(Str))
return true;
M->setDataLayout(Str);
return false;
}
}
/// toplevelentity
/// ::= 'source_filename' '=' STRINGCONSTANT
bool LLParser::ParseSourceFileName() {
assert(Lex.getKind() == lltok::kw_source_filename);
std::string Str;
Lex.Lex();
if (ParseToken(lltok::equal, "expected '=' after source_filename") ||
ParseStringConstant(Str))
return true;
M->setSourceFileName(Str);
return false;
}
/// toplevelentity
/// ::= 'deplibs' '=' '[' ']'
/// ::= 'deplibs' '=' '[' STRINGCONSTANT (',' STRINGCONSTANT)* ']'
/// FIXME: Remove in 4.0. Currently parse, but ignore.
bool LLParser::ParseDepLibs() {
assert(Lex.getKind() == lltok::kw_deplibs);
Lex.Lex();
if (ParseToken(lltok::equal, "expected '=' after deplibs") ||
ParseToken(lltok::lsquare, "expected '=' after deplibs"))
return true;
if (EatIfPresent(lltok::rsquare))
return false;
do {
std::string Str;
if (ParseStringConstant(Str)) return true;
} while (EatIfPresent(lltok::comma));
return ParseToken(lltok::rsquare, "expected ']' at end of list");
}
/// ParseUnnamedType:
/// ::= LocalVarID '=' 'type' type
bool LLParser::ParseUnnamedType() {
LocTy TypeLoc = Lex.getLoc();
unsigned TypeID = Lex.getUIntVal();
Lex.Lex(); // eat LocalVarID;
if (ParseToken(lltok::equal, "expected '=' after name") ||
ParseToken(lltok::kw_type, "expected 'type' after '='"))
return true;
Type *Result = nullptr;
if (ParseStructDefinition(TypeLoc, "",
NumberedTypes[TypeID], Result)) return true;
if (!isa<StructType>(Result)) {
std::pair<Type*, LocTy> &Entry = NumberedTypes[TypeID];
if (Entry.first)
return Error(TypeLoc, "non-struct types may not be recursive");
Entry.first = Result;
Entry.second = SMLoc();
}
return false;
}
/// toplevelentity
/// ::= LocalVar '=' 'type' type
bool LLParser::ParseNamedType() {
std::string Name = Lex.getStrVal();
LocTy NameLoc = Lex.getLoc();
Lex.Lex(); // eat LocalVar.
if (ParseToken(lltok::equal, "expected '=' after name") ||
ParseToken(lltok::kw_type, "expected 'type' after name"))
return true;
Type *Result = nullptr;
if (ParseStructDefinition(NameLoc, Name,
NamedTypes[Name], Result)) return true;
if (!isa<StructType>(Result)) {
std::pair<Type*, LocTy> &Entry = NamedTypes[Name];
if (Entry.first)
return Error(NameLoc, "non-struct types may not be recursive");
Entry.first = Result;
Entry.second = SMLoc();
}
return false;
}
/// toplevelentity
/// ::= 'declare' FunctionHeader
bool LLParser::ParseDeclare() {
assert(Lex.getKind() == lltok::kw_declare);
Lex.Lex();
std::vector<std::pair<unsigned, MDNode *>> MDs;
while (Lex.getKind() == lltok::MetadataVar) {
unsigned MDK;
MDNode *N;
if (ParseMetadataAttachment(MDK, N))
return true;
MDs.push_back({MDK, N});
}
Function *F;
if (ParseFunctionHeader(F, false))
return true;
for (auto &MD : MDs)
F->addMetadata(MD.first, *MD.second);
return false;
}
/// toplevelentity
/// ::= 'define' FunctionHeader (!dbg !56)* '{' ...
bool LLParser::ParseDefine() {
assert(Lex.getKind() == lltok::kw_define);
Lex.Lex();
Function *F;
return ParseFunctionHeader(F, true) ||
ParseOptionalFunctionMetadata(*F) ||
ParseFunctionBody(*F);
}
/// ParseGlobalType
/// ::= 'constant'
/// ::= 'global'
bool LLParser::ParseGlobalType(bool &IsConstant) {
if (Lex.getKind() == lltok::kw_constant)
IsConstant = true;
else if (Lex.getKind() == lltok::kw_global)
IsConstant = false;
else {
IsConstant = false;
return TokError("expected 'global' or 'constant'");
}
Lex.Lex();
return false;
}
bool LLParser::ParseOptionalUnnamedAddr(
GlobalVariable::UnnamedAddr &UnnamedAddr) {
if (EatIfPresent(lltok::kw_unnamed_addr))
UnnamedAddr = GlobalValue::UnnamedAddr::Global;
else if (EatIfPresent(lltok::kw_local_unnamed_addr))
UnnamedAddr = GlobalValue::UnnamedAddr::Local;
else
UnnamedAddr = GlobalValue::UnnamedAddr::None;
return false;
}
/// ParseUnnamedGlobal:
/// OptionalVisibility (ALIAS | IFUNC) ...
/// OptionalLinkage OptionalVisibility OptionalDLLStorageClass
/// ... -> global variable
/// GlobalID '=' OptionalVisibility (ALIAS | IFUNC) ...
/// GlobalID '=' OptionalLinkage OptionalVisibility OptionalDLLStorageClass
/// ... -> global variable
bool LLParser::ParseUnnamedGlobal() {
unsigned VarID = NumberedVals.size();
std::string Name;
LocTy NameLoc = Lex.getLoc();
// Handle the GlobalID form.
if (Lex.getKind() == lltok::GlobalID) {
if (Lex.getUIntVal() != VarID)
return Error(Lex.getLoc(), "variable expected to be numbered '%" +
Twine(VarID) + "'");
Lex.Lex(); // eat GlobalID;
if (ParseToken(lltok::equal, "expected '=' after name"))
return true;
}
bool HasLinkage;
unsigned Linkage, Visibility, DLLStorageClass;
GlobalVariable::ThreadLocalMode TLM;
GlobalVariable::UnnamedAddr UnnamedAddr;
if (ParseOptionalLinkage(Linkage, HasLinkage, Visibility, DLLStorageClass) ||
ParseOptionalThreadLocal(TLM) || ParseOptionalUnnamedAddr(UnnamedAddr))
return true;
if (Lex.getKind() != lltok::kw_alias && Lex.getKind() != lltok::kw_ifunc)
return ParseGlobal(Name, NameLoc, Linkage, HasLinkage, Visibility,
DLLStorageClass, TLM, UnnamedAddr);
return parseIndirectSymbol(Name, NameLoc, Linkage, Visibility,
DLLStorageClass, TLM, UnnamedAddr);
}
/// ParseNamedGlobal:
/// GlobalVar '=' OptionalVisibility (ALIAS | IFUNC) ...
/// GlobalVar '=' OptionalLinkage OptionalVisibility OptionalDLLStorageClass
/// ... -> global variable
bool LLParser::ParseNamedGlobal() {
assert(Lex.getKind() == lltok::GlobalVar);
LocTy NameLoc = Lex.getLoc();
std::string Name = Lex.getStrVal();
Lex.Lex();
bool HasLinkage;
unsigned Linkage, Visibility, DLLStorageClass;
GlobalVariable::ThreadLocalMode TLM;
GlobalVariable::UnnamedAddr UnnamedAddr;
if (ParseToken(lltok::equal, "expected '=' in global variable") ||
ParseOptionalLinkage(Linkage, HasLinkage, Visibility, DLLStorageClass) ||
ParseOptionalThreadLocal(TLM) || ParseOptionalUnnamedAddr(UnnamedAddr))
return true;
if (Lex.getKind() != lltok::kw_alias && Lex.getKind() != lltok::kw_ifunc)
return ParseGlobal(Name, NameLoc, Linkage, HasLinkage, Visibility,
DLLStorageClass, TLM, UnnamedAddr);
return parseIndirectSymbol(Name, NameLoc, Linkage, Visibility,
DLLStorageClass, TLM, UnnamedAddr);
}
bool LLParser::parseComdat() {
assert(Lex.getKind() == lltok::ComdatVar);
std::string Name = Lex.getStrVal();
LocTy NameLoc = Lex.getLoc();
Lex.Lex();
if (ParseToken(lltok::equal, "expected '=' here"))
return true;
if (ParseToken(lltok::kw_comdat, "expected comdat keyword"))
return TokError("expected comdat type");
Comdat::SelectionKind SK;
switch (Lex.getKind()) {
default:
return TokError("unknown selection kind");
case lltok::kw_any:
SK = Comdat::Any;
break;
case lltok::kw_exactmatch:
SK = Comdat::ExactMatch;
break;
case lltok::kw_largest:
SK = Comdat::Largest;
break;
case lltok::kw_noduplicates:
SK = Comdat::NoDuplicates;
break;
case lltok::kw_samesize:
SK = Comdat::SameSize;
break;
}
Lex.Lex();
// See if the comdat was forward referenced, if so, use the comdat.
Module::ComdatSymTabType &ComdatSymTab = M->getComdatSymbolTable();
Module::ComdatSymTabType::iterator I = ComdatSymTab.find(Name);
if (I != ComdatSymTab.end() && !ForwardRefComdats.erase(Name))
return Error(NameLoc, "redefinition of comdat '$" + Name + "'");
Comdat *C;
if (I != ComdatSymTab.end())
C = &I->second;
else
C = M->getOrInsertComdat(Name);
C->setSelectionKind(SK);
return false;
}
// MDString:
// ::= '!' STRINGCONSTANT
bool LLParser::ParseMDString(MDString *&Result) {
std::string Str;
if (ParseStringConstant(Str)) return true;
Result = MDString::get(Context, Str);
return false;
}
// MDNode:
// ::= '!' MDNodeNumber
bool LLParser::ParseMDNodeID(MDNode *&Result) {
// !{ ..., !42, ... }
LocTy IDLoc = Lex.getLoc();
unsigned MID = 0;
if (ParseUInt32(MID))
return true;
// If not a forward reference, just return it now.
if (NumberedMetadata.count(MID)) {
Result = NumberedMetadata[MID];
return false;
}
// Otherwise, create MDNode forward reference.
auto &FwdRef = ForwardRefMDNodes[MID];
FwdRef = std::make_pair(MDTuple::getTemporary(Context, None), IDLoc);
Result = FwdRef.first.get();
NumberedMetadata[MID].reset(Result);
return false;
}
/// ParseNamedMetadata:
/// !foo = !{ !1, !2 }
bool LLParser::ParseNamedMetadata() {
assert(Lex.getKind() == lltok::MetadataVar);
std::string Name = Lex.getStrVal();
Lex.Lex();
if (ParseToken(lltok::equal, "expected '=' here") ||
ParseToken(lltok::exclaim, "Expected '!' here") ||
ParseToken(lltok::lbrace, "Expected '{' here"))
return true;
NamedMDNode *NMD = M->getOrInsertNamedMetadata(Name);
if (Lex.getKind() != lltok::rbrace)
do {
if (ParseToken(lltok::exclaim, "Expected '!' here"))
return true;
MDNode *N = nullptr;
if (ParseMDNodeID(N)) return true;
NMD->addOperand(N);
} while (EatIfPresent(lltok::comma));
return ParseToken(lltok::rbrace, "expected end of metadata node");
}
/// ParseStandaloneMetadata:
/// !42 = !{...}
bool LLParser::ParseStandaloneMetadata() {
assert(Lex.getKind() == lltok::exclaim);
Lex.Lex();
unsigned MetadataID = 0;
MDNode *Init;
if (ParseUInt32(MetadataID) ||
ParseToken(lltok::equal, "expected '=' here"))
return true;
// Detect common error, from old metadata syntax.
if (Lex.getKind() == lltok::Type)
return TokError("unexpected type in metadata definition");
bool IsDistinct = EatIfPresent(lltok::kw_distinct);
if (Lex.getKind() == lltok::MetadataVar) {
if (ParseSpecializedMDNode(Init, IsDistinct))
return true;
} else if (ParseToken(lltok::exclaim, "Expected '!' here") ||
ParseMDTuple(Init, IsDistinct))
return true;
// See if this was forward referenced, if so, handle it.
auto FI = ForwardRefMDNodes.find(MetadataID);
if (FI != ForwardRefMDNodes.end()) {
FI->second.first->replaceAllUsesWith(Init);
ForwardRefMDNodes.erase(FI);
assert(NumberedMetadata[MetadataID] == Init && "Tracking VH didn't work");
} else {
if (NumberedMetadata.count(MetadataID))
return TokError("Metadata id is already used");
NumberedMetadata[MetadataID].reset(Init);
}
return false;
}
static bool isValidVisibilityForLinkage(unsigned V, unsigned L) {
return !GlobalValue::isLocalLinkage((GlobalValue::LinkageTypes)L) ||
(GlobalValue::VisibilityTypes)V == GlobalValue::DefaultVisibility;
}
/// parseIndirectSymbol:
/// ::= GlobalVar '=' OptionalLinkage OptionalVisibility
/// OptionalDLLStorageClass OptionalThreadLocal
/// OptionalUnnamedAddr 'alias|ifunc' IndirectSymbol
///
/// IndirectSymbol
/// ::= TypeAndValue
///
/// Everything through OptionalUnnamedAddr has already been parsed.
///
bool LLParser::parseIndirectSymbol(
const std::string &Name, LocTy NameLoc, unsigned L, unsigned Visibility,
unsigned DLLStorageClass, GlobalVariable::ThreadLocalMode TLM,
GlobalVariable::UnnamedAddr UnnamedAddr) {
bool IsAlias;
if (Lex.getKind() == lltok::kw_alias)
IsAlias = true;
else if (Lex.getKind() == lltok::kw_ifunc)
IsAlias = false;
else
llvm_unreachable("Not an alias or ifunc!");
Lex.Lex();
GlobalValue::LinkageTypes Linkage = (GlobalValue::LinkageTypes) L;
if(IsAlias && !GlobalAlias::isValidLinkage(Linkage))
return Error(NameLoc, "invalid linkage type for alias");
if (!isValidVisibilityForLinkage(Visibility, L))
return Error(NameLoc,
"symbol with local linkage must have default visibility");
Type *Ty;
LocTy ExplicitTypeLoc = Lex.getLoc();
if (ParseType(Ty) ||
ParseToken(lltok::comma, "expected comma after alias or ifunc's type"))
return true;
Constant *Aliasee;
LocTy AliaseeLoc = Lex.getLoc();
if (Lex.getKind() != lltok::kw_bitcast &&
Lex.getKind() != lltok::kw_getelementptr &&
Lex.getKind() != lltok::kw_addrspacecast &&
Lex.getKind() != lltok::kw_inttoptr) {
if (ParseGlobalTypeAndValue(Aliasee))
return true;
} else {
// The bitcast dest type is not present, it is implied by the dest type.
ValID ID;
if (ParseValID(ID))
return true;
if (ID.Kind != ValID::t_Constant)
return Error(AliaseeLoc, "invalid aliasee");
Aliasee = ID.ConstantVal;
}
Type *AliaseeType = Aliasee->getType();
auto *PTy = dyn_cast<PointerType>(AliaseeType);
if (!PTy)
return Error(AliaseeLoc, "An alias or ifunc must have pointer type");
unsigned AddrSpace = PTy->getAddressSpace();
if (IsAlias && Ty != PTy->getElementType())
return Error(
ExplicitTypeLoc,
"explicit pointee type doesn't match operand's pointee type");
if (!IsAlias && !PTy->getElementType()->isFunctionTy())
return Error(
ExplicitTypeLoc,
"explicit pointee type should be a function type");
GlobalValue *GVal = nullptr;
// See if the alias was forward referenced, if so, prepare to replace the
// forward reference.
if (!Name.empty()) {
GVal = M->getNamedValue(Name);
if (GVal) {
if (!ForwardRefVals.erase(Name))
return Error(NameLoc, "redefinition of global '@" + Name + "'");
}
} else {
auto I = ForwardRefValIDs.find(NumberedVals.size());
if (I != ForwardRefValIDs.end()) {
GVal = I->second.first;
ForwardRefValIDs.erase(I);
}
}
// Okay, create the alias but do not insert it into the module yet.
std::unique_ptr<GlobalIndirectSymbol> GA;
if (IsAlias)
GA.reset(GlobalAlias::create(Ty, AddrSpace,
(GlobalValue::LinkageTypes)Linkage, Name,
Aliasee, /*Parent*/ nullptr));
else
GA.reset(GlobalIFunc::create(Ty, AddrSpace,
(GlobalValue::LinkageTypes)Linkage, Name,
Aliasee, /*Parent*/ nullptr));
GA->setThreadLocalMode(TLM);
GA->setVisibility((GlobalValue::VisibilityTypes)Visibility);
GA->setDLLStorageClass((GlobalValue::DLLStorageClassTypes)DLLStorageClass);
GA->setUnnamedAddr(UnnamedAddr);
if (Name.empty())
NumberedVals.push_back(GA.get());
if (GVal) {
// Verify that types agree.
if (GVal->getType() != GA->getType())
return Error(
ExplicitTypeLoc,
"forward reference and definition of alias have different types");
// If they agree, just RAUW the old value with the alias and remove the
// forward ref info.
GVal->replaceAllUsesWith(GA.get());
GVal->eraseFromParent();
}
// Insert into the module, we know its name won't collide now.
if (IsAlias)
M->getAliasList().push_back(cast<GlobalAlias>(GA.get()));
else
M->getIFuncList().push_back(cast<GlobalIFunc>(GA.get()));
assert(GA->getName() == Name && "Should not be a name conflict!");
// The module owns this now
GA.release();
return false;
}
/// ParseGlobal
/// ::= GlobalVar '=' OptionalLinkage OptionalVisibility OptionalDLLStorageClass
/// OptionalThreadLocal OptionalUnnamedAddr OptionalAddrSpace
/// OptionalExternallyInitialized GlobalType Type Const
/// ::= OptionalLinkage OptionalVisibility OptionalDLLStorageClass
/// OptionalThreadLocal OptionalUnnamedAddr OptionalAddrSpace
/// OptionalExternallyInitialized GlobalType Type Const
///
/// Everything up to and including OptionalUnnamedAddr has been parsed
/// already.
///
bool LLParser::ParseGlobal(const std::string &Name, LocTy NameLoc,
unsigned Linkage, bool HasLinkage,
unsigned Visibility, unsigned DLLStorageClass,
GlobalVariable::ThreadLocalMode TLM,
GlobalVariable::UnnamedAddr UnnamedAddr) {
if (!isValidVisibilityForLinkage(Visibility, Linkage))
return Error(NameLoc,
"symbol with local linkage must have default visibility");
unsigned AddrSpace;
bool IsConstant, IsExternallyInitialized;
LocTy IsExternallyInitializedLoc;
LocTy TyLoc;
Type *Ty = nullptr;
if (ParseOptionalAddrSpace(AddrSpace) ||
ParseOptionalToken(lltok::kw_externally_initialized,
IsExternallyInitialized,
&IsExternallyInitializedLoc) ||
ParseGlobalType(IsConstant) ||
ParseType(Ty, TyLoc))
return true;
// If the linkage is specified and is external, then no initializer is
// present.
Constant *Init = nullptr;
if (!HasLinkage ||
!GlobalValue::isValidDeclarationLinkage(
(GlobalValue::LinkageTypes)Linkage)) {
if (ParseGlobalValue(Ty, Init))
return true;
}
if (Ty->isFunctionTy() || !PointerType::isValidElementType(Ty))
return Error(TyLoc, "invalid type for global variable");
GlobalValue *GVal = nullptr;
// See if the global was forward referenced, if so, use the global.
if (!Name.empty()) {
GVal = M->getNamedValue(Name);
if (GVal) {
if (!ForwardRefVals.erase(Name))
return Error(NameLoc, "redefinition of global '@" + Name + "'");
}
} else {
auto I = ForwardRefValIDs.find(NumberedVals.size());
if (I != ForwardRefValIDs.end()) {
GVal = I->second.first;
ForwardRefValIDs.erase(I);
}
}
GlobalVariable *GV;
if (!GVal) {
GV = new GlobalVariable(*M, Ty, false, GlobalValue::ExternalLinkage, nullptr,
Name, nullptr, GlobalVariable::NotThreadLocal,
AddrSpace);
} else {
if (GVal->getValueType() != Ty)
return Error(TyLoc,
"forward reference and definition of global have different types");
GV = cast<GlobalVariable>(GVal);
// Move the forward-reference to the correct spot in the module.
M->getGlobalList().splice(M->global_end(), M->getGlobalList(), GV);
}
if (Name.empty())
NumberedVals.push_back(GV);
// Set the parsed properties on the global.
if (Init)
GV->setInitializer(Init);
GV->setConstant(IsConstant);
GV->setLinkage((GlobalValue::LinkageTypes)Linkage);
GV->setVisibility((GlobalValue::VisibilityTypes)Visibility);
GV->setDLLStorageClass((GlobalValue::DLLStorageClassTypes)DLLStorageClass);
GV->setExternallyInitialized(IsExternallyInitialized);
GV->setThreadLocalMode(TLM);
GV->setUnnamedAddr(UnnamedAddr);
// Parse attributes on the global.
while (Lex.getKind() == lltok::comma) {
Lex.Lex();
if (Lex.getKind() == lltok::kw_section) {
Lex.Lex();
GV->setSection(Lex.getStrVal());
if (ParseToken(lltok::StringConstant, "expected global section string"))
return true;
} else if (Lex.getKind() == lltok::kw_align) {
unsigned Alignment;
if (ParseOptionalAlignment(Alignment)) return true;
GV->setAlignment(Alignment);
} else if (Lex.getKind() == lltok::MetadataVar) {
if (ParseGlobalObjectMetadataAttachment(*GV))
return true;
} else {
Comdat *C;
if (parseOptionalComdat(Name, C))
return true;
if (C)
GV->setComdat(C);
else
return TokError("unknown global variable property!");
}
}
return false;
}
/// ParseUnnamedAttrGrp
/// ::= 'attributes' AttrGrpID '=' '{' AttrValPair+ '}'
bool LLParser::ParseUnnamedAttrGrp() {
assert(Lex.getKind() == lltok::kw_attributes);
LocTy AttrGrpLoc = Lex.getLoc();
Lex.Lex();
if (Lex.getKind() != lltok::AttrGrpID)
return TokError("expected attribute group id");
unsigned VarID = Lex.getUIntVal();
std::vector<unsigned> unused;
LocTy BuiltinLoc;
Lex.Lex();
if (ParseToken(lltok::equal, "expected '=' here") ||
ParseToken(lltok::lbrace, "expected '{' here") ||
ParseFnAttributeValuePairs(NumberedAttrBuilders[VarID], unused, true,
BuiltinLoc) ||
ParseToken(lltok::rbrace, "expected end of attribute group"))
return true;
if (!NumberedAttrBuilders[VarID].hasAttributes())
return Error(AttrGrpLoc, "attribute group has no attributes");
return false;
}
/// ParseFnAttributeValuePairs
/// ::= <attr> | <attr> '=' <value>
bool LLParser::ParseFnAttributeValuePairs(AttrBuilder &B,
std::vector<unsigned> &FwdRefAttrGrps,
bool inAttrGrp, LocTy &BuiltinLoc) {
bool HaveError = false;
B.clear();
while (true) {
lltok::Kind Token = Lex.getKind();
if (Token == lltok::kw_builtin)
BuiltinLoc = Lex.getLoc();
switch (Token) {
default:
if (!inAttrGrp) return HaveError;
return Error(Lex.getLoc(), "unterminated attribute group");
case lltok::rbrace:
// Finished.
return false;
case lltok::AttrGrpID: {
// Allow a function to reference an attribute group:
//
// define void @foo() #1 { ... }
if (inAttrGrp)