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e95a065d26
It's currently ambiguous in IR whether the source language explicitly did not want a stack a stack protector (in C, via function attribute no_stack_protector) or doesn't care for any given function. It's common for code that manipulates the stack via inline assembly or that has to set up its own stack canary (such as the Linux kernel) would like to avoid stack protectors in certain functions. In this case, we've been bitten by numerous bugs where a callee with a stack protector is inlined into an __attribute__((__no_stack_protector__)) caller, which generally breaks the caller's assumptions about not having a stack protector. LTO exacerbates the issue. While developers can avoid this by putting all no_stack_protector functions in one translation unit together and compiling those with -fno-stack-protector, it's generally not very ergonomic or as ergonomic as a function attribute, and still doesn't work for LTO. See also: https://lore.kernel.org/linux-pm/20200915172658.1432732-1-rkir@google.com/ https://lore.kernel.org/lkml/20200918201436.2932360-30-samitolvanen@google.com/T/#u Typically, when inlining a callee into a caller, the caller will be upgraded in its level of stack protection (see adjustCallerSSPLevel()). By adding an explicit attribute in the IR when the function attribute is used in the source language, we can now identify such cases and prevent inlining. Block inlining when the callee and caller differ in the case that one contains `nossp` when the other has `ssp`, `sspstrong`, or `sspreq`. Fixes pr/47479. Reviewed By: void Differential Revision: https://reviews.llvm.org/D87956
424 lines
12 KiB
Plaintext
424 lines
12 KiB
Plaintext
(*
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polygen grammar for LLVM assembly language.
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This file defines an LLVM assembly language grammar for polygen,
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which is a tool for generating random text based on a grammar.
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It is strictly syntax-based, and makes no attempt to generate
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IR that is semantically valid. Most of the IR produced doesn't
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pass the Verifier.
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TODO: Metadata, in all its forms
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*)
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I ::= "title: LLVM assembly language\n"
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^ "status: experimental\n"
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^ "audience: LLVM developers\n"
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;
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S ::= Module ;
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(*
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Define rules for non-keyword tokens. This is currently just a bunch
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of hacks. They don't cover many valid forms of tokens, and they also
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generate some invalid forms of tokens. The LLVM parser has custom
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C++ code to lex these; custom C++ code for emitting them would be
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convenient, but polygen doesn't support that.
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*)
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NonZeroDecimalDigit ::= 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 ;
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DecimalDigit ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 ;
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DecimalDigitSeq ::= DecimalDigit [^ DecimalDigitSeq ];
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HexDigit ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
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| a | b | c | d | e | f ;
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HexDigitSeq ::= HexDigit [^ HexDigitSeq ];
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StringChar ::= a | b | c | d | e | f | g | h | i | j | k | l | m
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| n | o | p | q | r | s | t | u | v | w | x | y | z ;
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StringConstantSeq ::= StringChar [^ StringConstantSeq ];
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StringConstant ::= StringChar [^ StringConstantSeq ];
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EUINT64VAL ::= NonZeroDecimalDigit [^ DecimalDigitSeq ];
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ESINT64VAL ::= [ "-" ] ^ EUINT64VAL ;
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EUAPINTVAL ::= EUINT64VAL ;
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ESAPINTVAL ::= ESINT64VAL ;
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LOCALVALID ::= "%" ^ DecimalDigitSeq ;
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GLOBALVALID ::= "@" ^ DecimalDigitSeq ;
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INTTYPE ::= "i" ^ EUINT64VAL ;
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GLOBALVAR ::= "@" ^ StringConstant ;
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LOCALVAR ::= "%" ^ StringConstant ;
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STRINGCONSTANT ::= "\"" ^ StringConstant ^ "\"" ;
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ATSTRINGCONSTANT ::= "@" ^ STRINGCONSTANT ;
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PCTSTRINGCONSTANT ::= "%" ^ STRINGCONSTANT ;
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LABELSTR ::= StringConstant ;
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FPVAL ::= ESAPINTVAL ^ "." ^ EUAPINTVAL | "0x" ^ HexDigitSeq ;
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(*
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The rest of this file is derived directly from llvmAsmParser.y.
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*)
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ArithmeticOps ::= + OptNW add | fadd | OptNW sub | fsub | OptNW mul | fmul |
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udiv | OptExact sdiv | fdiv | urem | srem | frem ;
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LogicalOps ::= shl | lshr | ashr | and | or | xor;
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CastOps ::= trunc | zext | sext | fptrunc | fpext | bitcast |
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uitofp | sitofp | fptoui | fptosi | inttoptr | ptrtoint ;
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IPredicates ::= eq | ne | slt | sgt | sle | sge | ult | ugt | ule | uge ;
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FPredicates ::= oeq | one | olt | ogt | ole | oge | ord | uno | ueq | une
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| ult | ugt | ule | uge | true | false ;
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IntType ::= INTTYPE;
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FPType ::= float | double | "ppc_fp128" | fp128 | "x86_fp80";
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LocalName ::= LOCALVAR | STRINGCONSTANT | PCTSTRINGCONSTANT ;
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OptLocalName ::= LocalName | _ ;
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OptAddrSpace ::= - addrspace ^ "(" ^ EUINT64VAL ^ ")" | _ ;
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OptLocalAssign ::= LocalName "=" | _ ;
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GlobalName ::= GLOBALVAR | ATSTRINGCONSTANT ;
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OptGlobalAssign ::= GlobalAssign | _ ;
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GlobalAssign ::= GlobalName "=" ;
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GVInternalLinkage
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::= + internal
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| weak
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| "weak_odr"
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| linkonce
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| "linkonce_odr"
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| appending
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| dllexport
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| common
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| private
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;
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GVExternalLinkage
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::= dllimport
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| "extern_weak"
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| + external
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;
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GVVisibilityStyle
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::= + _
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| default
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| hidden
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| protected
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;
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FunctionDeclareLinkage
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::= + _
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| dllimport
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| "extern_weak"
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;
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FunctionDefineLinkage
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::= + _
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| internal
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| linkonce
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| "linkonce_odr"
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| weak
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| "weak_odr"
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| dllexport
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;
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AliasLinkage ::= + _ | weak | "weak_odr" | internal ;
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OptCallingConv ::= + _ |
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ccc |
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fastcc |
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coldcc |
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"x86_stdcallcc" |
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"x86_fastcallcc" |
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cc EUINT64VAL ;
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ParamAttr ::= zeroext
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| signext
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| inreg
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| sret
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| noalias
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| nocapture
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| byval
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| nest
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| align EUINT64VAL
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;
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OptParamAttrs ::= + _ | OptParamAttrs ParamAttr ;
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RetAttr ::= inreg
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| zeroext
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| signext
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| noalias
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;
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OptRetAttrs ::= _
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| OptRetAttrs RetAttr
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;
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FuncAttr ::= noreturn
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| nounwind
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| inreg
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| zeroext
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| signext
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| readnone
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| readonly
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| inlinehint
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| alignstack
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| noinline
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| alwaysinline
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| optsize
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| nossp
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| ssp
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| sspreq
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| returns_twice
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| nonlazybind
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| sanitize_address
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| sanitize_thread
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| sanitize_memory
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| mustprogress
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;
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OptFuncAttrs ::= + _ | OptFuncAttrs FuncAttr ;
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OptGC ::= + _ | gc STRINGCONSTANT ;
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OptAlign ::= + _ | align EUINT64VAL ;
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OptCAlign ::= + _ | ^ "," align EUINT64VAL ;
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SectionString ::= section STRINGCONSTANT ;
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OptSection ::= + _ | SectionString ;
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GlobalVarAttributes ::= + _ | ^ "," GlobalVarAttribute GlobalVarAttributes ;
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GlobalVarAttribute ::= SectionString | align EUINT64VAL ;
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PrimType ::= INTTYPE | float | double | "ppc_fp128" | fp128 | "x86_fp80"
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| - label ;
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Types
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::= opaque
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| PrimType
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| Types OptAddrSpace ^ "*"
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| SymbolicValueRef
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| "\\" ^ EUINT64VAL
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| Types "(" ^ ArgTypeListI ^ ")" OptFuncAttrs
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| void "(" ^ ArgTypeListI ^ ")" OptFuncAttrs
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| "[" ^ EUINT64VAL "x" Types ^ "]"
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| "<" ^ EUINT64VAL "x" Types ^ ">"
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| "{" TypeListI "}"
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| "{" ^ "}"
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| "<" ^ "{" TypeListI "}" ^ ">"
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| "<" ^ "{" ^ "}" ^ ">"
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;
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ArgType ::= Types OptParamAttrs ;
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ResultTypes ::= Types | void ;
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ArgTypeList ::= ArgType | ArgTypeList ^ "," ArgType ;
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ArgTypeListI ::= ArgTypeList | ArgTypeList ^ "," "..." | "..." | _ ;
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TypeListI ::= Types | TypeListI ^ "," Types ;
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ConstVal::= Types "[" ^ ConstVector ^ "]"
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| Types "[" ^ "]"
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| Types "c" ^ STRINGCONSTANT
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| Types "<" ^ ConstVector ^ ">"
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| Types "{" ConstVector "}"
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| Types "{" ^ "}"
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| Types "<" ^ "{" ConstVector "}" ^ ">"
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| Types "<" ^ "{" ^ "}" ^ ">"
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| Types null
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| Types undef
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| Types SymbolicValueRef
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| Types ConstExpr
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| Types zeroinitializer
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| Types ESINT64VAL
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| Types ESAPINTVAL
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| Types EUINT64VAL
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| Types EUAPINTVAL
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| Types true
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| Types false
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| Types FPVAL ;
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ConstExpr::= CastOps "(" ^ ConstVal to Types ^ ")"
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| getelementptr OptInBounds "(" ^ ConstVal IndexList ^ ")"
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| select "(" ^ ConstVal ^ "," ConstVal ^ "," ConstVal ^ ")"
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| ArithmeticOps "(" ^ ConstVal ^ "," ConstVal ^ ")"
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| LogicalOps "(" ^ ConstVal ^ "," ConstVal ^ ")"
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| icmp IPredicates "(" ^ ConstVal ^ "," ConstVal ^ ")"
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| fcmp FPredicates "(" ^ ConstVal ^ "," ConstVal ^ ")"
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| extractelement "(" ^ ConstVal ^ "," ConstVal ^ ")"
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| insertelement "(" ^ ConstVal ^ "," ConstVal ^ "," ConstVal ^ ")"
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| shufflevector "(" ^ ConstVal ^ "," ConstVal ^ "," ConstVal ^ ")"
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| extractvalue "(" ^ ConstVal ^ ConstantIndexList ^ ")"
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| insertvalue "(" ^ ConstVal ^ "," ConstVal ^ ConstantIndexList ^ ")" ;
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ConstVector ::= ConstVector ^ "," ConstVal | ConstVal ;
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GlobalType ::= global | constant ;
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ThreadLocal ::= - "thread_local" | _ ;
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AliaseeRef ::= ResultTypes SymbolicValueRef
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| bitcast "(" ^ AliaseeRef to Types ^ ")" ;
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Module ::= +++ DefinitionList | --- _ ;
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DefinitionList ::= - Definition | + DefinitionList Definition ;
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Definition
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::= ^ ( +++++ define Function
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| declare FunctionProto
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| - module asm AsmBlock
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| OptLocalAssign type Types
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| OptGlobalAssign GVVisibilityStyle ThreadLocal OptAddrSpace GlobalType
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ConstVal GlobalVarAttributes
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| OptGlobalAssign GVInternalLinkage GVVisibilityStyle ThreadLocal OptAddrSpace
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GlobalType ConstVal GlobalVarAttributes
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| OptGlobalAssign GVExternalLinkage GVVisibilityStyle ThreadLocal OptAddrSpace
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GlobalType Types GlobalVarAttributes
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| OptGlobalAssign GVVisibilityStyle alias AliasLinkage AliaseeRef
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| target TargetDefinition
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| deplibs "=" LibrariesDefinition
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) ^ "\n";
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AsmBlock ::= STRINGCONSTANT ;
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TargetDefinition ::= triple "=" STRINGCONSTANT
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| datalayout "=" STRINGCONSTANT ;
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LibrariesDefinition ::= "[" ( LibList | _ ) "]";
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LibList ::= LibList ^ "," STRINGCONSTANT | STRINGCONSTANT ;
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ArgListH ::= ArgListH ^ "," Types OptParamAttrs OptLocalName
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| Types OptParamAttrs OptLocalName ;
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ArgList ::= ArgListH | ArgListH ^ "," "..." | "..." | _ ;
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FunctionHeaderH ::= OptCallingConv OptRetAttrs ResultTypes
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GlobalName ^ "(" ^ ArgList ^ ")"
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OptFuncAttrs OptSection OptAlign OptGC ;
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BEGIN ::= ( begin | "{" ) ^ "\n";
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FunctionHeader ::=
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FunctionDefineLinkage GVVisibilityStyle FunctionHeaderH BEGIN ;
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END ::= ^ ( end | "}" ) ^ "\n";
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Function ::= BasicBlockList END ;
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FunctionProto ::= FunctionDeclareLinkage GVVisibilityStyle FunctionHeaderH ;
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OptSideEffect ::= _ | sideeffect ;
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ConstValueRef ::= ESINT64VAL
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| EUINT64VAL
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| FPVAL
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| true
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| false
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| null
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| undef
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| zeroinitializer
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| "<" ConstVector ">"
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| "[" ConstVector "]"
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| "[" ^ "]"
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| "c" ^ STRINGCONSTANT
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| "{" ConstVector "}"
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| "{" ^ "}"
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| "<" ^ "{" ConstVector "}" ^ ">"
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| "<" ^ "{" ^ "}" ^ ">"
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| ConstExpr
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| asm OptSideEffect STRINGCONSTANT ^ "," STRINGCONSTANT ;
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SymbolicValueRef ::= LOCALVALID
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| GLOBALVALID
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| LocalName
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| GlobalName ;
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ValueRef ::= SymbolicValueRef | ConstValueRef;
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ResolvedVal ::= Types ValueRef ;
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ReturnedVal ::= ResolvedVal | ReturnedVal ^ "," ResolvedVal ;
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BasicBlockList ::= BasicBlockList BasicBlock | FunctionHeader BasicBlock ;
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BasicBlock ::= InstructionList OptLocalAssign BBTerminatorInst ;
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InstructionList ::= +++ InstructionList Inst
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| - _
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| ^ LABELSTR ^ ":\n" ;
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BBTerminatorInst ::= ^ " " ^
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( ret ReturnedVal
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| ret void
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| br label ValueRef
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| br INTTYPE ValueRef ^ "," label ValueRef ^ "," label ValueRef
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| switch IntType ValueRef ^ "," label ValueRef "[" JumpTable "]"
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| switch IntType ValueRef ^ "," label ValueRef "[" ^ "]"
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| invoke OptCallingConv ResultTypes ValueRef ^ "(" ^ ParamList ^ ")"
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OptFuncAttrs
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to label ValueRef unwind label ValueRef
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| unwind
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| unreachable ) ^ "\n";
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JumpTable ::= JumpTable IntType ConstValueRef ^ "," label ValueRef
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| IntType ConstValueRef ^ "," label ValueRef ;
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Inst ::= ^ " " ^ OptLocalAssign InstVal ^ "\n";
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PHIList ::= Types "[" ValueRef ^ "," ValueRef "]"
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| PHIList ^ "," "[" ValueRef ^ "," ValueRef "]" ;
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ParamList ::= Types OptParamAttrs ValueRef OptParamAttrs
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| label OptParamAttrs ValueRef OptParamAttrs
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| ParamList ^ "," Types OptParamAttrs ValueRef OptParamAttrs
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| ParamList ^ "," label OptParamAttrs ValueRef OptParamAttrs
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| - _ ;
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IndexList ::= _ | IndexList ^ "," ResolvedVal ;
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ConstantIndexList ::= "," EUINT64VAL | ConstantIndexList ^ "," EUINT64VAL ;
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OptTailCall ::= tail call | call ;
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InstVal ::=
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ArithmeticOps Types ValueRef ^ "," ValueRef
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| LogicalOps Types ValueRef ^ "," ValueRef
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| icmp IPredicates Types ValueRef ^ "," ValueRef
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| fcmp FPredicates Types ValueRef ^ "," ValueRef
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| CastOps ResolvedVal to Types
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| select ResolvedVal ^ "," ResolvedVal ^ "," ResolvedVal
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| "va_arg" ResolvedVal ^ "," Types
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| extractelement ResolvedVal ^ "," ResolvedVal
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| insertelement ResolvedVal ^ "," ResolvedVal ^ "," ResolvedVal
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| shufflevector ResolvedVal ^ "," ResolvedVal ^ "," ResolvedVal
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| phi PHIList
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| OptTailCall OptCallingConv ResultTypes ValueRef ^ "(" ^ ParamList ^ ")"
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OptFuncAttrs
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| MemoryInst ;
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OptVolatile ::= - volatile | _ ;
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OptExact ::= - exact | _ ;
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OptNSW ::= - nsw | _ ;
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OptNUW ::= - nuw | _ ;
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OptNW ::= OptNUW OptNSW | OptNSW OptNUW ;
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OptInBounds ::= - inbounds | _ ;
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MemoryInst ::= malloc Types OptCAlign
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| malloc Types ^ "," INTTYPE ValueRef OptCAlign
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| alloca Types OptCAlign
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| alloca Types ^ "," INTTYPE ValueRef OptCAlign
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| free ResolvedVal
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| OptVolatile load Types ValueRef OptCAlign
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| OptVolatile store ResolvedVal ^ "," Types ValueRef OptCAlign
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| getresult Types ValueRef ^ "," EUINT64VAL
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| getelementptr OptInBounds Types ValueRef IndexList
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| extractvalue Types ValueRef ^ ConstantIndexList
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| insertvalue Types ValueRef ^ "," Types ValueRef ^ ConstantIndexList ;
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