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509132b368
Currently we do not represent runtime preemption in the IR, which has several
drawbacks:
1) The semantics of GlobalValues differ depending on the object file format
you are targeting (as well as the relocation-model and -fPIE value).
2) We have no way of disabling inlining of run time interposable functions,
since in the IR we only know if a function is link-time interposable.
Because of this llvm cannot support elf-interposition semantics.
3) In LTO builds of executables we will have extra knowledge that a symbol
resolved to a local definition and can't be preemptable, but have no way to
propagate that knowledge through the compiler.
This patch adds preemptability specifiers to the IR with the following meaning:
dso_local --> means the compiler may assume the symbol will resolve to a
definition within the current linkage unit and the symbol may be accessed
directly even if the definition is not within this compilation unit.
dso_preemptable --> means that the compiler must assume the GlobalValue may be
replaced with a definition from outside the current linkage unit at runtime.
To ease transitioning dso_preemptable is treated as a 'default' in that
low-level codegen will still do the same checks it did previously to see if a
symbol should be accessed indirectly. Eventually when IR producers emit the
specifiers on all Globalvalues we can change dso_preemptable to mean 'always
access indirectly', and remove the current logic.
Differential Revision: https://reviews.llvm.org/D20217
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316668 91177308-0d34-0410-b5e6-96231b3b80d8
525 lines
21 KiB
C++
525 lines
21 KiB
C++
//===-- LLParser.h - Parser Class -------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the parser class for .ll files.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_ASMPARSER_LLPARSER_H
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#define LLVM_LIB_ASMPARSER_LLPARSER_H
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#include "LLLexer.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/IR/Attributes.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Operator.h"
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#include "llvm/IR/Type.h"
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#include "llvm/IR/ValueHandle.h"
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#include <map>
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namespace llvm {
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class Module;
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class OpaqueType;
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class Function;
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class Value;
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class BasicBlock;
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class Instruction;
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class Constant;
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class GlobalValue;
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class Comdat;
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class MDString;
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class MDNode;
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struct SlotMapping;
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class StructType;
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/// ValID - Represents a reference of a definition of some sort with no type.
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/// There are several cases where we have to parse the value but where the
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/// type can depend on later context. This may either be a numeric reference
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/// or a symbolic (%var) reference. This is just a discriminated union.
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struct ValID {
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enum {
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t_LocalID, t_GlobalID, // ID in UIntVal.
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t_LocalName, t_GlobalName, // Name in StrVal.
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t_APSInt, t_APFloat, // Value in APSIntVal/APFloatVal.
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t_Null, t_Undef, t_Zero, t_None, // No value.
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t_EmptyArray, // No value: []
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t_Constant, // Value in ConstantVal.
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t_InlineAsm, // Value in FTy/StrVal/StrVal2/UIntVal.
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t_ConstantStruct, // Value in ConstantStructElts.
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t_PackedConstantStruct // Value in ConstantStructElts.
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} Kind = t_LocalID;
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LLLexer::LocTy Loc;
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unsigned UIntVal;
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FunctionType *FTy = nullptr;
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std::string StrVal, StrVal2;
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APSInt APSIntVal;
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APFloat APFloatVal{0.0};
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Constant *ConstantVal;
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std::unique_ptr<Constant *[]> ConstantStructElts;
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ValID() = default;
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ValID(const ValID &RHS)
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: Kind(RHS.Kind), Loc(RHS.Loc), UIntVal(RHS.UIntVal), FTy(RHS.FTy),
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StrVal(RHS.StrVal), StrVal2(RHS.StrVal2), APSIntVal(RHS.APSIntVal),
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APFloatVal(RHS.APFloatVal), ConstantVal(RHS.ConstantVal) {
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assert(!RHS.ConstantStructElts);
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}
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bool operator<(const ValID &RHS) const {
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if (Kind == t_LocalID || Kind == t_GlobalID)
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return UIntVal < RHS.UIntVal;
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assert((Kind == t_LocalName || Kind == t_GlobalName ||
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Kind == t_ConstantStruct || Kind == t_PackedConstantStruct) &&
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"Ordering not defined for this ValID kind yet");
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return StrVal < RHS.StrVal;
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}
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};
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class LLParser {
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public:
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typedef LLLexer::LocTy LocTy;
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private:
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LLVMContext &Context;
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LLLexer Lex;
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Module *M;
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SlotMapping *Slots;
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// Instruction metadata resolution. Each instruction can have a list of
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// MDRef info associated with them.
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//
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// The simpler approach of just creating temporary MDNodes and then calling
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// RAUW on them when the definition is processed doesn't work because some
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// instruction metadata kinds, such as dbg, get stored in the IR in an
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// "optimized" format which doesn't participate in the normal value use
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// lists. This means that RAUW doesn't work, even on temporary MDNodes
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// which otherwise support RAUW. Instead, we defer resolving MDNode
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// references until the definitions have been processed.
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struct MDRef {
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SMLoc Loc;
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unsigned MDKind, MDSlot;
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};
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SmallVector<Instruction*, 64> InstsWithTBAATag;
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// Type resolution handling data structures. The location is set when we
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// have processed a use of the type but not a definition yet.
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StringMap<std::pair<Type*, LocTy> > NamedTypes;
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std::map<unsigned, std::pair<Type*, LocTy> > NumberedTypes;
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std::map<unsigned, TrackingMDNodeRef> NumberedMetadata;
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std::map<unsigned, std::pair<TempMDTuple, LocTy>> ForwardRefMDNodes;
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// Global Value reference information.
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std::map<std::string, std::pair<GlobalValue*, LocTy> > ForwardRefVals;
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std::map<unsigned, std::pair<GlobalValue*, LocTy> > ForwardRefValIDs;
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std::vector<GlobalValue*> NumberedVals;
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// Comdat forward reference information.
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std::map<std::string, LocTy> ForwardRefComdats;
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// References to blockaddress. The key is the function ValID, the value is
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// a list of references to blocks in that function.
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std::map<ValID, std::map<ValID, GlobalValue *>> ForwardRefBlockAddresses;
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class PerFunctionState;
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/// Reference to per-function state to allow basic blocks to be
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/// forward-referenced by blockaddress instructions within the same
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/// function.
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PerFunctionState *BlockAddressPFS;
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// Attribute builder reference information.
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std::map<Value*, std::vector<unsigned> > ForwardRefAttrGroups;
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std::map<unsigned, AttrBuilder> NumberedAttrBuilders;
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/// Only the llvm-as tool may set this to false to bypass
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/// UpgradeDebuginfo so it can generate broken bitcode.
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bool UpgradeDebugInfo;
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public:
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LLParser(StringRef F, SourceMgr &SM, SMDiagnostic &Err, Module *M,
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SlotMapping *Slots = nullptr, bool UpgradeDebugInfo = true)
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: Context(M->getContext()), Lex(F, SM, Err, M->getContext()), M(M),
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Slots(Slots), BlockAddressPFS(nullptr),
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UpgradeDebugInfo(UpgradeDebugInfo) {}
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bool Run();
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bool parseStandaloneConstantValue(Constant *&C, const SlotMapping *Slots);
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bool parseTypeAtBeginning(Type *&Ty, unsigned &Read,
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const SlotMapping *Slots);
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LLVMContext &getContext() { return Context; }
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private:
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bool Error(LocTy L, const Twine &Msg) const {
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return Lex.Error(L, Msg);
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}
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bool TokError(const Twine &Msg) const {
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return Error(Lex.getLoc(), Msg);
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}
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/// Restore the internal name and slot mappings using the mappings that
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/// were created at an earlier parsing stage.
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void restoreParsingState(const SlotMapping *Slots);
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/// GetGlobalVal - Get a value with the specified name or ID, creating a
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/// forward reference record if needed. This can return null if the value
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/// exists but does not have the right type.
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GlobalValue *GetGlobalVal(const std::string &N, Type *Ty, LocTy Loc);
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GlobalValue *GetGlobalVal(unsigned ID, Type *Ty, LocTy Loc);
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/// Get a Comdat with the specified name, creating a forward reference
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/// record if needed.
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Comdat *getComdat(const std::string &N, LocTy Loc);
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// Helper Routines.
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bool ParseToken(lltok::Kind T, const char *ErrMsg);
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bool EatIfPresent(lltok::Kind T) {
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if (Lex.getKind() != T) return false;
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Lex.Lex();
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return true;
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}
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FastMathFlags EatFastMathFlagsIfPresent() {
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FastMathFlags FMF;
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while (true)
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switch (Lex.getKind()) {
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case lltok::kw_fast: FMF.setUnsafeAlgebra(); Lex.Lex(); continue;
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case lltok::kw_nnan: FMF.setNoNaNs(); Lex.Lex(); continue;
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case lltok::kw_ninf: FMF.setNoInfs(); Lex.Lex(); continue;
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case lltok::kw_nsz: FMF.setNoSignedZeros(); Lex.Lex(); continue;
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case lltok::kw_arcp: FMF.setAllowReciprocal(); Lex.Lex(); continue;
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case lltok::kw_contract:
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FMF.setAllowContract(true);
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Lex.Lex();
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continue;
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default: return FMF;
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}
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return FMF;
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}
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bool ParseOptionalToken(lltok::Kind T, bool &Present,
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LocTy *Loc = nullptr) {
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if (Lex.getKind() != T) {
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Present = false;
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} else {
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if (Loc)
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*Loc = Lex.getLoc();
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Lex.Lex();
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Present = true;
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}
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return false;
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}
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bool ParseStringConstant(std::string &Result);
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bool ParseUInt32(unsigned &Val);
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bool ParseUInt32(unsigned &Val, LocTy &Loc) {
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Loc = Lex.getLoc();
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return ParseUInt32(Val);
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}
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bool ParseUInt64(uint64_t &Val);
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bool ParseUInt64(uint64_t &Val, LocTy &Loc) {
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Loc = Lex.getLoc();
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return ParseUInt64(Val);
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}
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bool ParseStringAttribute(AttrBuilder &B);
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bool ParseTLSModel(GlobalVariable::ThreadLocalMode &TLM);
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bool ParseOptionalThreadLocal(GlobalVariable::ThreadLocalMode &TLM);
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bool ParseOptionalUnnamedAddr(GlobalVariable::UnnamedAddr &UnnamedAddr);
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bool ParseOptionalAddrSpace(unsigned &AddrSpace);
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bool ParseOptionalParamAttrs(AttrBuilder &B);
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bool ParseOptionalReturnAttrs(AttrBuilder &B);
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bool ParseOptionalLinkage(unsigned &Linkage, bool &HasLinkage,
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unsigned &Visibility, unsigned &DLLStorageClass,
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bool &DSOLocal);
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void ParseOptionalDSOLocal(bool &DSOLocal);
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void ParseOptionalVisibility(unsigned &Visibility);
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void ParseOptionalDLLStorageClass(unsigned &DLLStorageClass);
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bool ParseOptionalCallingConv(unsigned &CC);
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bool ParseOptionalAlignment(unsigned &Alignment);
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bool ParseOptionalDerefAttrBytes(lltok::Kind AttrKind, uint64_t &Bytes);
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bool ParseScopeAndOrdering(bool isAtomic, SyncScope::ID &SSID,
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AtomicOrdering &Ordering);
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bool ParseScope(SyncScope::ID &SSID);
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bool ParseOrdering(AtomicOrdering &Ordering);
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bool ParseOptionalStackAlignment(unsigned &Alignment);
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bool ParseOptionalCommaAlign(unsigned &Alignment, bool &AteExtraComma);
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bool ParseOptionalCommaAddrSpace(unsigned &AddrSpace, LocTy &Loc,
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bool &AteExtraComma);
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bool ParseOptionalCommaInAlloca(bool &IsInAlloca);
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bool parseAllocSizeArguments(unsigned &ElemSizeArg,
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Optional<unsigned> &HowManyArg);
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bool ParseIndexList(SmallVectorImpl<unsigned> &Indices,
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bool &AteExtraComma);
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bool ParseIndexList(SmallVectorImpl<unsigned> &Indices) {
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bool AteExtraComma;
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if (ParseIndexList(Indices, AteExtraComma)) return true;
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if (AteExtraComma)
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return TokError("expected index");
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return false;
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}
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// Top-Level Entities
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bool ParseTopLevelEntities();
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bool ValidateEndOfModule();
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bool ParseTargetDefinition();
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bool ParseModuleAsm();
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bool ParseSourceFileName();
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bool ParseDepLibs(); // FIXME: Remove in 4.0.
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bool ParseUnnamedType();
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bool ParseNamedType();
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bool ParseDeclare();
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bool ParseDefine();
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bool ParseGlobalType(bool &IsConstant);
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bool ParseUnnamedGlobal();
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bool ParseNamedGlobal();
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bool ParseGlobal(const std::string &Name, LocTy Loc, unsigned Linkage,
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bool HasLinkage, unsigned Visibility,
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unsigned DLLStorageClass, bool DSOLocal,
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GlobalVariable::ThreadLocalMode TLM,
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GlobalVariable::UnnamedAddr UnnamedAddr);
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bool parseIndirectSymbol(const std::string &Name, LocTy Loc,
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unsigned Linkage, unsigned Visibility,
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unsigned DLLStorageClass, bool DSOLocal,
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GlobalVariable::ThreadLocalMode TLM,
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GlobalVariable::UnnamedAddr UnnamedAddr);
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bool parseComdat();
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bool ParseStandaloneMetadata();
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bool ParseNamedMetadata();
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bool ParseMDString(MDString *&Result);
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bool ParseMDNodeID(MDNode *&Result);
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bool ParseUnnamedAttrGrp();
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bool ParseFnAttributeValuePairs(AttrBuilder &B,
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std::vector<unsigned> &FwdRefAttrGrps,
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bool inAttrGrp, LocTy &BuiltinLoc);
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// Type Parsing.
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bool ParseType(Type *&Result, const Twine &Msg, bool AllowVoid = false);
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bool ParseType(Type *&Result, bool AllowVoid = false) {
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return ParseType(Result, "expected type", AllowVoid);
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}
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bool ParseType(Type *&Result, const Twine &Msg, LocTy &Loc,
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bool AllowVoid = false) {
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Loc = Lex.getLoc();
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return ParseType(Result, Msg, AllowVoid);
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}
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bool ParseType(Type *&Result, LocTy &Loc, bool AllowVoid = false) {
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Loc = Lex.getLoc();
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return ParseType(Result, AllowVoid);
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}
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bool ParseAnonStructType(Type *&Result, bool Packed);
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bool ParseStructBody(SmallVectorImpl<Type*> &Body);
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bool ParseStructDefinition(SMLoc TypeLoc, StringRef Name,
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std::pair<Type*, LocTy> &Entry,
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Type *&ResultTy);
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bool ParseArrayVectorType(Type *&Result, bool isVector);
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bool ParseFunctionType(Type *&Result);
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// Function Semantic Analysis.
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class PerFunctionState {
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LLParser &P;
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Function &F;
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std::map<std::string, std::pair<Value*, LocTy> > ForwardRefVals;
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std::map<unsigned, std::pair<Value*, LocTy> > ForwardRefValIDs;
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std::vector<Value*> NumberedVals;
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/// FunctionNumber - If this is an unnamed function, this is the slot
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/// number of it, otherwise it is -1.
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int FunctionNumber;
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public:
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PerFunctionState(LLParser &p, Function &f, int FunctionNumber);
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~PerFunctionState();
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Function &getFunction() const { return F; }
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bool FinishFunction();
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/// GetVal - Get a value with the specified name or ID, creating a
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/// forward reference record if needed. This can return null if the value
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/// exists but does not have the right type.
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Value *GetVal(const std::string &Name, Type *Ty, LocTy Loc);
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Value *GetVal(unsigned ID, Type *Ty, LocTy Loc);
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/// SetInstName - After an instruction is parsed and inserted into its
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/// basic block, this installs its name.
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bool SetInstName(int NameID, const std::string &NameStr, LocTy NameLoc,
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Instruction *Inst);
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/// GetBB - Get a basic block with the specified name or ID, creating a
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/// forward reference record if needed. This can return null if the value
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/// is not a BasicBlock.
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BasicBlock *GetBB(const std::string &Name, LocTy Loc);
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BasicBlock *GetBB(unsigned ID, LocTy Loc);
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/// DefineBB - Define the specified basic block, which is either named or
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/// unnamed. If there is an error, this returns null otherwise it returns
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/// the block being defined.
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BasicBlock *DefineBB(const std::string &Name, LocTy Loc);
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bool resolveForwardRefBlockAddresses();
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};
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bool ConvertValIDToValue(Type *Ty, ValID &ID, Value *&V,
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PerFunctionState *PFS);
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bool parseConstantValue(Type *Ty, Constant *&C);
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bool ParseValue(Type *Ty, Value *&V, PerFunctionState *PFS);
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bool ParseValue(Type *Ty, Value *&V, PerFunctionState &PFS) {
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return ParseValue(Ty, V, &PFS);
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}
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bool ParseValue(Type *Ty, Value *&V, LocTy &Loc,
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PerFunctionState &PFS) {
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Loc = Lex.getLoc();
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return ParseValue(Ty, V, &PFS);
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}
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bool ParseTypeAndValue(Value *&V, PerFunctionState *PFS);
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bool ParseTypeAndValue(Value *&V, PerFunctionState &PFS) {
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return ParseTypeAndValue(V, &PFS);
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}
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bool ParseTypeAndValue(Value *&V, LocTy &Loc, PerFunctionState &PFS) {
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Loc = Lex.getLoc();
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return ParseTypeAndValue(V, PFS);
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}
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bool ParseTypeAndBasicBlock(BasicBlock *&BB, LocTy &Loc,
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PerFunctionState &PFS);
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bool ParseTypeAndBasicBlock(BasicBlock *&BB, PerFunctionState &PFS) {
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LocTy Loc;
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return ParseTypeAndBasicBlock(BB, Loc, PFS);
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}
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struct ParamInfo {
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LocTy Loc;
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Value *V;
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AttributeSet Attrs;
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ParamInfo(LocTy loc, Value *v, AttributeSet attrs)
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: Loc(loc), V(v), Attrs(attrs) {}
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};
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bool ParseParameterList(SmallVectorImpl<ParamInfo> &ArgList,
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PerFunctionState &PFS,
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bool IsMustTailCall = false,
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bool InVarArgsFunc = false);
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bool
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ParseOptionalOperandBundles(SmallVectorImpl<OperandBundleDef> &BundleList,
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PerFunctionState &PFS);
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bool ParseExceptionArgs(SmallVectorImpl<Value *> &Args,
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PerFunctionState &PFS);
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// Constant Parsing.
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bool ParseValID(ValID &ID, PerFunctionState *PFS = nullptr);
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bool ParseGlobalValue(Type *Ty, Constant *&V);
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bool ParseGlobalTypeAndValue(Constant *&V);
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bool ParseGlobalValueVector(SmallVectorImpl<Constant *> &Elts,
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Optional<unsigned> *InRangeOp = nullptr);
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bool parseOptionalComdat(StringRef GlobalName, Comdat *&C);
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bool ParseMetadataAsValue(Value *&V, PerFunctionState &PFS);
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bool ParseValueAsMetadata(Metadata *&MD, const Twine &TypeMsg,
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PerFunctionState *PFS);
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bool ParseMetadata(Metadata *&MD, PerFunctionState *PFS);
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bool ParseMDTuple(MDNode *&MD, bool IsDistinct = false);
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bool ParseMDNode(MDNode *&MD);
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bool ParseMDNodeTail(MDNode *&MD);
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bool ParseMDNodeVector(SmallVectorImpl<Metadata *> &MDs);
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bool ParseMetadataAttachment(unsigned &Kind, MDNode *&MD);
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bool ParseInstructionMetadata(Instruction &Inst);
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bool ParseGlobalObjectMetadataAttachment(GlobalObject &GO);
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bool ParseOptionalFunctionMetadata(Function &F);
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template <class FieldTy>
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bool ParseMDField(LocTy Loc, StringRef Name, FieldTy &Result);
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template <class FieldTy> bool ParseMDField(StringRef Name, FieldTy &Result);
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template <class ParserTy>
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bool ParseMDFieldsImplBody(ParserTy parseField);
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template <class ParserTy>
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bool ParseMDFieldsImpl(ParserTy parseField, LocTy &ClosingLoc);
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bool ParseSpecializedMDNode(MDNode *&N, bool IsDistinct = false);
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#define HANDLE_SPECIALIZED_MDNODE_LEAF(CLASS) \
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bool Parse##CLASS(MDNode *&Result, bool IsDistinct);
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#include "llvm/IR/Metadata.def"
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// Function Parsing.
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struct ArgInfo {
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LocTy Loc;
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Type *Ty;
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AttributeSet Attrs;
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std::string Name;
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ArgInfo(LocTy L, Type *ty, AttributeSet Attr, const std::string &N)
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: Loc(L), Ty(ty), Attrs(Attr), Name(N) {}
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};
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bool ParseArgumentList(SmallVectorImpl<ArgInfo> &ArgList, bool &isVarArg);
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bool ParseFunctionHeader(Function *&Fn, bool isDefine);
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bool ParseFunctionBody(Function &Fn);
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bool ParseBasicBlock(PerFunctionState &PFS);
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enum TailCallType { TCT_None, TCT_Tail, TCT_MustTail };
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// Instruction Parsing. Each instruction parsing routine can return with a
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// normal result, an error result, or return having eaten an extra comma.
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enum InstResult { InstNormal = 0, InstError = 1, InstExtraComma = 2 };
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int ParseInstruction(Instruction *&Inst, BasicBlock *BB,
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PerFunctionState &PFS);
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bool ParseCmpPredicate(unsigned &Pred, unsigned Opc);
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bool ParseRet(Instruction *&Inst, BasicBlock *BB, PerFunctionState &PFS);
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bool ParseBr(Instruction *&Inst, PerFunctionState &PFS);
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bool ParseSwitch(Instruction *&Inst, PerFunctionState &PFS);
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bool ParseIndirectBr(Instruction *&Inst, PerFunctionState &PFS);
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bool ParseInvoke(Instruction *&Inst, PerFunctionState &PFS);
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bool ParseResume(Instruction *&Inst, PerFunctionState &PFS);
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bool ParseCleanupRet(Instruction *&Inst, PerFunctionState &PFS);
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bool ParseCatchRet(Instruction *&Inst, PerFunctionState &PFS);
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bool ParseCatchSwitch(Instruction *&Inst, PerFunctionState &PFS);
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bool ParseCatchPad(Instruction *&Inst, PerFunctionState &PFS);
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bool ParseCleanupPad(Instruction *&Inst, PerFunctionState &PFS);
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bool ParseArithmetic(Instruction *&I, PerFunctionState &PFS, unsigned Opc,
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unsigned OperandType);
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bool ParseLogical(Instruction *&I, PerFunctionState &PFS, unsigned Opc);
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bool ParseCompare(Instruction *&I, PerFunctionState &PFS, unsigned Opc);
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bool ParseCast(Instruction *&I, PerFunctionState &PFS, unsigned Opc);
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bool ParseSelect(Instruction *&I, PerFunctionState &PFS);
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bool ParseVA_Arg(Instruction *&I, PerFunctionState &PFS);
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bool ParseExtractElement(Instruction *&I, PerFunctionState &PFS);
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bool ParseInsertElement(Instruction *&I, PerFunctionState &PFS);
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bool ParseShuffleVector(Instruction *&I, PerFunctionState &PFS);
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int ParsePHI(Instruction *&I, PerFunctionState &PFS);
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bool ParseLandingPad(Instruction *&I, PerFunctionState &PFS);
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bool ParseCall(Instruction *&I, PerFunctionState &PFS,
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CallInst::TailCallKind IsTail);
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int ParseAlloc(Instruction *&I, PerFunctionState &PFS);
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int ParseLoad(Instruction *&I, PerFunctionState &PFS);
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int ParseStore(Instruction *&I, PerFunctionState &PFS);
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int ParseCmpXchg(Instruction *&I, PerFunctionState &PFS);
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int ParseAtomicRMW(Instruction *&I, PerFunctionState &PFS);
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int ParseFence(Instruction *&I, PerFunctionState &PFS);
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int ParseGetElementPtr(Instruction *&I, PerFunctionState &PFS);
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int ParseExtractValue(Instruction *&I, PerFunctionState &PFS);
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int ParseInsertValue(Instruction *&I, PerFunctionState &PFS);
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// Use-list order directives.
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bool ParseUseListOrder(PerFunctionState *PFS = nullptr);
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bool ParseUseListOrderBB();
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bool ParseUseListOrderIndexes(SmallVectorImpl<unsigned> &Indexes);
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bool sortUseListOrder(Value *V, ArrayRef<unsigned> Indexes, SMLoc Loc);
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};
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} // End llvm namespace
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#endif
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