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llvm-mirror/utils/llvm.grm

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(*
polygen grammar for LLVM assembly language.
This file defines an LLVM assembly language grammar for polygen,
which is a tool for generating random text based on a grammar.
It is strictly syntax-based, and makes no attempt to generate
IR that is semantically valid. Most of the IR produced doesn't
pass the Verifier.
TODO: Metadata, in all its forms
*)
I ::= "title: LLVM assembly language\n"
^ "status: experimental\n"
^ "audience: LLVM developers\n"
;
S ::= Module ;
(*
Define rules for non-keyword tokens. This is currently just a bunch
of hacks. They don't cover many valid forms of tokens, and they also
generate some invalid forms of tokens. The LLVM parser has custom
C++ code to lex these; custom C++ code for emitting them would be
convenient, but polygen doesn't support that.
*)
NonZeroDecimalDigit ::= 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 ;
DecimalDigit ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 ;
DecimalDigitSeq ::= DecimalDigit [^ DecimalDigitSeq ];
HexDigit ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
| a | b | c | d | e | f ;
HexDigitSeq ::= HexDigit [^ HexDigitSeq ];
StringChar ::= a | b | c | d | e | f | g | h | i | j | k | l | m
| n | o | p | q | r | s | t | u | v | w | x | y | z ;
StringConstantSeq ::= StringChar [^ StringConstantSeq ];
StringConstant ::= StringChar [^ StringConstantSeq ];
EUINT64VAL ::= NonZeroDecimalDigit [^ DecimalDigitSeq ];
ESINT64VAL ::= [ "-" ] ^ EUINT64VAL ;
EUAPINTVAL ::= EUINT64VAL ;
ESAPINTVAL ::= ESINT64VAL ;
LOCALVALID ::= "%" ^ DecimalDigitSeq ;
GLOBALVALID ::= "@" ^ DecimalDigitSeq ;
INTTYPE ::= "i" ^ EUINT64VAL ;
GLOBALVAR ::= "@" ^ StringConstant ;
LOCALVAR ::= "%" ^ StringConstant ;
STRINGCONSTANT ::= "\"" ^ StringConstant ^ "\"" ;
ATSTRINGCONSTANT ::= "@" ^ STRINGCONSTANT ;
PCTSTRINGCONSTANT ::= "%" ^ STRINGCONSTANT ;
LABELSTR ::= StringConstant ;
FPVAL ::= ESAPINTVAL ^ "." ^ EUAPINTVAL | "0x" ^ HexDigitSeq ;
(*
The rest of this file is derived directly from llvmAsmParser.y.
*)
ArithmeticOps ::= + OptNW add | fadd | OptNW sub | fsub | OptNW mul | fmul |
udiv | OptExact sdiv | fdiv | urem | srem | frem ;
LogicalOps ::= shl | lshr | ashr | and | or | xor;
CastOps ::= trunc | zext | sext | fptrunc | fpext | bitcast |
uitofp | sitofp | fptoui | fptosi | inttoptr | ptrtoint ;
IPredicates ::= eq | ne | slt | sgt | sle | sge | ult | ugt | ule | uge ;
FPredicates ::= oeq | one | olt | ogt | ole | oge | ord | uno | ueq | une
| ult | ugt | ule | uge | true | false ;
IntType ::= INTTYPE;
FPType ::= float | double | "ppc_fp128" | fp128 | "x86_fp80";
LocalName ::= LOCALVAR | STRINGCONSTANT | PCTSTRINGCONSTANT ;
OptLocalName ::= LocalName | _ ;
OptAddrSpace ::= - addrspace ^ "(" ^ EUINT64VAL ^ ")" | _ ;
OptLocalAssign ::= LocalName "=" | _ ;
GlobalName ::= GLOBALVAR | ATSTRINGCONSTANT ;
OptGlobalAssign ::= GlobalAssign | _ ;
GlobalAssign ::= GlobalName "=" ;
GVInternalLinkage
::= + internal
| weak
| "weak_odr"
| linkonce
| "linkonce_odr"
| appending
| dllexport
| common
| private
;
GVExternalLinkage
::= dllimport
| "extern_weak"
| + external
;
GVVisibilityStyle
::= + _
| default
| hidden
| protected
;
FunctionDeclareLinkage
::= + _
| dllimport
| "extern_weak"
;
FunctionDefineLinkage
::= + _
| internal
| linkonce
| "linkonce_odr"
| weak
| "weak_odr"
| dllexport
;
AliasLinkage ::= + _ | weak | "weak_odr" | internal ;
OptCallingConv ::= + _ |
ccc |
fastcc |
coldcc |
"x86_stdcallcc" |
"x86_fastcallcc" |
cc EUINT64VAL ;
ParamAttr ::= zeroext
| signext
| inreg
| sret
| noalias
| nocapture
| byval
| nest
| align EUINT64VAL
;
OptParamAttrs ::= + _ | OptParamAttrs ParamAttr ;
RetAttr ::= inreg
| zeroext
| signext
| noalias
;
OptRetAttrs ::= _
| OptRetAttrs RetAttr
;
FuncAttr ::= noreturn
| nounwind
| inreg
| zeroext
| signext
| readnone
| readonly
| inlinehint
| alignstack
| noinline
| alwaysinline
| optsize
| ssp
| sspreq
| returns_twice
| nonlazybind
| sanitize_address
| sanitize_thread
| sanitize_memory
[LangRef] Define mustprogress attribute LLVM IR currently assumes some form of forward progress. This form is not explicitly defined anywhere, and is the cause of miscompilations in most languages that are not C++11 or later. This implicit forward progress guarantee can not be opted out of on a function level nor on a loop level. Languages such as C (C11 and later), C++ (pre-C++11), and Rust have different forward progress requirements and this needs to be evident in the IR. Specifically, C11 and onwards (6.8.5, Paragraph 6) states that "An iteration statement whose controlling expression is not a constant expression, that performs no input/output operations, does not access volatile objects, and performs no synchronization or atomic operations in its body, controlling expression, or (in the case of for statement) its expression-3, may be assumed by the implementation to terminate." C++11 and onwards does not have this assumption, and instead assumes that every thread must make progress as defined in [intro.progress] when it comes to scheduling. This was initially brought up in [0] as a bug, a solution was presented in [1] which is the current workaround, and the predecessor to this change was [2]. After defining a notion of forward progress for IR, there are two options to address this: 1) Set the default to assuming Forward Progress and provide an opt-out for functions and an opt-in for loops. 2) Set the default to not assuming Forward Progress and provide an opt-in for functions, and an opt-in for loops. Option 2) has been selected because only C++11 and onwards have a forward progress requirement and it makes sense for them to opt-into it via the defined `mustprogress` function attribute. The `mustprogress` function attribute indicates that the function is required to make forward progress as defined. This is sharply in contrast to the status quo where this is implicitly assumed. In addition, `willreturn` implies `mustprogress`. The background for why this definition was chosen is in [3] and for why the option was chosen is in [4] and the corresponding thread(s). The implementation is in D85393, the clang patch is in D86841, the LoopDeletion patch is in D86844, the Inliner patches are in D87180 and D87262, and there will be more incoming. [0] https://bugs.llvm.org/show_bug.cgi?id=965#c25 [1] https://lists.llvm.org/pipermail/llvm-dev/2017-October/118558.html [2] https://reviews.llvm.org/D65718 [3] https://lists.llvm.org/pipermail/llvm-dev/2020-September/144919.html [4] https://lists.llvm.org/pipermail/llvm-dev/2020-September/145023.html Reviewed By: jdoerfert, efriedma, nikic Differential Revision: https://reviews.llvm.org/D86233
2020-10-19 19:29:10 +02:00
| mustprogress
;
OptFuncAttrs ::= + _ | OptFuncAttrs FuncAttr ;
OptGC ::= + _ | gc STRINGCONSTANT ;
OptAlign ::= + _ | align EUINT64VAL ;
OptCAlign ::= + _ | ^ "," align EUINT64VAL ;
SectionString ::= section STRINGCONSTANT ;
OptSection ::= + _ | SectionString ;
GlobalVarAttributes ::= + _ | ^ "," GlobalVarAttribute GlobalVarAttributes ;
GlobalVarAttribute ::= SectionString | align EUINT64VAL ;
PrimType ::= INTTYPE | float | double | "ppc_fp128" | fp128 | "x86_fp80"
| - label ;
Types
::= opaque
| PrimType
| Types OptAddrSpace ^ "*"
| SymbolicValueRef
| "\\" ^ EUINT64VAL
| Types "(" ^ ArgTypeListI ^ ")" OptFuncAttrs
| void "(" ^ ArgTypeListI ^ ")" OptFuncAttrs
| "[" ^ EUINT64VAL "x" Types ^ "]"
| "<" ^ EUINT64VAL "x" Types ^ ">"
| "{" TypeListI "}"
| "{" ^ "}"
| "<" ^ "{" TypeListI "}" ^ ">"
| "<" ^ "{" ^ "}" ^ ">"
;
ArgType ::= Types OptParamAttrs ;
ResultTypes ::= Types | void ;
ArgTypeList ::= ArgType | ArgTypeList ^ "," ArgType ;
ArgTypeListI ::= ArgTypeList | ArgTypeList ^ "," "..." | "..." | _ ;
TypeListI ::= Types | TypeListI ^ "," Types ;
ConstVal::= Types "[" ^ ConstVector ^ "]"
| Types "[" ^ "]"
| Types "c" ^ STRINGCONSTANT
| Types "<" ^ ConstVector ^ ">"
| Types "{" ConstVector "}"
| Types "{" ^ "}"
| Types "<" ^ "{" ConstVector "}" ^ ">"
| Types "<" ^ "{" ^ "}" ^ ">"
| Types null
| Types undef
| Types SymbolicValueRef
| Types ConstExpr
| Types zeroinitializer
| Types ESINT64VAL
| Types ESAPINTVAL
| Types EUINT64VAL
| Types EUAPINTVAL
| Types true
| Types false
| Types FPVAL ;
ConstExpr::= CastOps "(" ^ ConstVal to Types ^ ")"
| getelementptr OptInBounds "(" ^ ConstVal IndexList ^ ")"
| select "(" ^ ConstVal ^ "," ConstVal ^ "," ConstVal ^ ")"
| ArithmeticOps "(" ^ ConstVal ^ "," ConstVal ^ ")"
| LogicalOps "(" ^ ConstVal ^ "," ConstVal ^ ")"
| icmp IPredicates "(" ^ ConstVal ^ "," ConstVal ^ ")"
| fcmp FPredicates "(" ^ ConstVal ^ "," ConstVal ^ ")"
| extractelement "(" ^ ConstVal ^ "," ConstVal ^ ")"
| insertelement "(" ^ ConstVal ^ "," ConstVal ^ "," ConstVal ^ ")"
| shufflevector "(" ^ ConstVal ^ "," ConstVal ^ "," ConstVal ^ ")"
| extractvalue "(" ^ ConstVal ^ ConstantIndexList ^ ")"
| insertvalue "(" ^ ConstVal ^ "," ConstVal ^ ConstantIndexList ^ ")" ;
ConstVector ::= ConstVector ^ "," ConstVal | ConstVal ;
GlobalType ::= global | constant ;
ThreadLocal ::= - "thread_local" | _ ;
AliaseeRef ::= ResultTypes SymbolicValueRef
| bitcast "(" ^ AliaseeRef to Types ^ ")" ;
Module ::= +++ DefinitionList | --- _ ;
DefinitionList ::= - Definition | + DefinitionList Definition ;
Definition
::= ^ ( +++++ define Function
| declare FunctionProto
| - module asm AsmBlock
| OptLocalAssign type Types
| OptGlobalAssign GVVisibilityStyle ThreadLocal OptAddrSpace GlobalType
ConstVal GlobalVarAttributes
| OptGlobalAssign GVInternalLinkage GVVisibilityStyle ThreadLocal OptAddrSpace
GlobalType ConstVal GlobalVarAttributes
| OptGlobalAssign GVExternalLinkage GVVisibilityStyle ThreadLocal OptAddrSpace
GlobalType Types GlobalVarAttributes
| OptGlobalAssign GVVisibilityStyle alias AliasLinkage AliaseeRef
| target TargetDefinition
| deplibs "=" LibrariesDefinition
) ^ "\n";
AsmBlock ::= STRINGCONSTANT ;
TargetDefinition ::= triple "=" STRINGCONSTANT
| datalayout "=" STRINGCONSTANT ;
LibrariesDefinition ::= "[" ( LibList | _ ) "]";
LibList ::= LibList ^ "," STRINGCONSTANT | STRINGCONSTANT ;
ArgListH ::= ArgListH ^ "," Types OptParamAttrs OptLocalName
| Types OptParamAttrs OptLocalName ;
ArgList ::= ArgListH | ArgListH ^ "," "..." | "..." | _ ;
FunctionHeaderH ::= OptCallingConv OptRetAttrs ResultTypes
GlobalName ^ "(" ^ ArgList ^ ")"
OptFuncAttrs OptSection OptAlign OptGC ;
BEGIN ::= ( begin | "{" ) ^ "\n";
FunctionHeader ::=
FunctionDefineLinkage GVVisibilityStyle FunctionHeaderH BEGIN ;
END ::= ^ ( end | "}" ) ^ "\n";
Function ::= BasicBlockList END ;
FunctionProto ::= FunctionDeclareLinkage GVVisibilityStyle FunctionHeaderH ;
OptSideEffect ::= _ | sideeffect ;
ConstValueRef ::= ESINT64VAL
| EUINT64VAL
| FPVAL
| true
| false
| null
| undef
| zeroinitializer
| "<" ConstVector ">"
| "[" ConstVector "]"
| "[" ^ "]"
| "c" ^ STRINGCONSTANT
| "{" ConstVector "}"
| "{" ^ "}"
| "<" ^ "{" ConstVector "}" ^ ">"
| "<" ^ "{" ^ "}" ^ ">"
| ConstExpr
| asm OptSideEffect STRINGCONSTANT ^ "," STRINGCONSTANT ;
SymbolicValueRef ::= LOCALVALID
| GLOBALVALID
| LocalName
| GlobalName ;
ValueRef ::= SymbolicValueRef | ConstValueRef;
ResolvedVal ::= Types ValueRef ;
ReturnedVal ::= ResolvedVal | ReturnedVal ^ "," ResolvedVal ;
BasicBlockList ::= BasicBlockList BasicBlock | FunctionHeader BasicBlock ;
BasicBlock ::= InstructionList OptLocalAssign BBTerminatorInst ;
InstructionList ::= +++ InstructionList Inst
| - _
| ^ LABELSTR ^ ":\n" ;
BBTerminatorInst ::= ^ " " ^
( ret ReturnedVal
| ret void
| br label ValueRef
| br INTTYPE ValueRef ^ "," label ValueRef ^ "," label ValueRef
| switch IntType ValueRef ^ "," label ValueRef "[" JumpTable "]"
| switch IntType ValueRef ^ "," label ValueRef "[" ^ "]"
| invoke OptCallingConv ResultTypes ValueRef ^ "(" ^ ParamList ^ ")"
OptFuncAttrs
to label ValueRef unwind label ValueRef
| unwind
| unreachable ) ^ "\n";
JumpTable ::= JumpTable IntType ConstValueRef ^ "," label ValueRef
| IntType ConstValueRef ^ "," label ValueRef ;
Inst ::= ^ " " ^ OptLocalAssign InstVal ^ "\n";
PHIList ::= Types "[" ValueRef ^ "," ValueRef "]"
| PHIList ^ "," "[" ValueRef ^ "," ValueRef "]" ;
ParamList ::= Types OptParamAttrs ValueRef OptParamAttrs
| label OptParamAttrs ValueRef OptParamAttrs
| ParamList ^ "," Types OptParamAttrs ValueRef OptParamAttrs
| ParamList ^ "," label OptParamAttrs ValueRef OptParamAttrs
| - _ ;
IndexList ::= _ | IndexList ^ "," ResolvedVal ;
ConstantIndexList ::= "," EUINT64VAL | ConstantIndexList ^ "," EUINT64VAL ;
OptTailCall ::= tail call | call ;
InstVal ::=
ArithmeticOps Types ValueRef ^ "," ValueRef
| LogicalOps Types ValueRef ^ "," ValueRef
| icmp IPredicates Types ValueRef ^ "," ValueRef
| fcmp FPredicates Types ValueRef ^ "," ValueRef
| CastOps ResolvedVal to Types
| select ResolvedVal ^ "," ResolvedVal ^ "," ResolvedVal
| "va_arg" ResolvedVal ^ "," Types
| extractelement ResolvedVal ^ "," ResolvedVal
| insertelement ResolvedVal ^ "," ResolvedVal ^ "," ResolvedVal
| shufflevector ResolvedVal ^ "," ResolvedVal ^ "," ResolvedVal
| phi PHIList
| OptTailCall OptCallingConv ResultTypes ValueRef ^ "(" ^ ParamList ^ ")"
OptFuncAttrs
| MemoryInst ;
OptVolatile ::= - volatile | _ ;
OptExact ::= - exact | _ ;
OptNSW ::= - nsw | _ ;
OptNUW ::= - nuw | _ ;
OptNW ::= OptNUW OptNSW | OptNSW OptNUW ;
OptInBounds ::= - inbounds | _ ;
MemoryInst ::= malloc Types OptCAlign
| malloc Types ^ "," INTTYPE ValueRef OptCAlign
| alloca Types OptCAlign
| alloca Types ^ "," INTTYPE ValueRef OptCAlign
| free ResolvedVal
| OptVolatile load Types ValueRef OptCAlign
| OptVolatile store ResolvedVal ^ "," Types ValueRef OptCAlign
| getresult Types ValueRef ^ "," EUINT64VAL
| getelementptr OptInBounds Types ValueRef IndexList
| extractvalue Types ValueRef ^ ConstantIndexList
| insertvalue Types ValueRef ^ "," Types ValueRef ^ ConstantIndexList ;