b7926ce6d7
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
242 lines
6.2 KiB
VimL
242 lines
6.2 KiB
VimL
" Vim syntax file
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" Language: llvm
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" Maintainer: The LLVM team, http://llvm.org/
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" Version: $Revision$
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if version < 600
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syntax clear
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elseif exists("b:current_syntax")
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finish
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endif
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syn case match
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" Types.
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" Types also include struct, array, vector, etc. but these don't
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" benefit as much from having dedicated highlighting rules.
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syn keyword llvmType void half bfloat float double x86_fp80 fp128 ppc_fp128
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syn keyword llvmType label metadata x86_mmx
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syn keyword llvmType type label opaque token
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syn match llvmType /\<i\d\+\>/
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" Instructions.
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" The true and false tokens can be used for comparison opcodes, but it's
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" much more common for these tokens to be used for boolean constants.
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syn keyword llvmStatement add addrspacecast alloca and arcp ashr atomicrmw
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syn keyword llvmStatement bitcast br catchpad catchswitch catchret call callbr
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syn keyword llvmStatement cleanuppad cleanupret cmpxchg eq exact extractelement
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syn keyword llvmStatement extractvalue fadd fast fcmp fdiv fence fmul fpext
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syn keyword llvmStatement fptosi fptoui fptrunc free frem fsub fneg getelementptr
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syn keyword llvmStatement icmp inbounds indirectbr insertelement insertvalue
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syn keyword llvmStatement inttoptr invoke landingpad load lshr malloc max min
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syn keyword llvmStatement mul nand ne ninf nnan nsw nsz nuw oeq oge ogt ole
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syn keyword llvmStatement olt one or ord phi ptrtoint resume ret sdiv select
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syn keyword llvmStatement sext sge sgt shl shufflevector sitofp sle slt srem
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syn keyword llvmStatement store sub switch trunc udiv ueq uge ugt uitofp ule ult
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syn keyword llvmStatement umax umin une uno unreachable unwind urem va_arg
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syn keyword llvmStatement xchg xor zext
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" Keywords.
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syn keyword llvmKeyword
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\ acq_rel
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\ acquire
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\ addrspace
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\ alias
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\ align
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\ alignstack
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\ alwaysinline
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\ appending
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\ argmemonly
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\ arm_aapcscc
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\ arm_aapcs_vfpcc
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\ arm_apcscc
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\ asm
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\ atomic
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\ available_externally
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\ blockaddress
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\ builtin
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\ byref
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\ byval
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\ c
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\ catch
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\ caller
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\ cc
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\ ccc
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\ cleanup
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\ coldcc
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\ comdat
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\ common
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\ constant
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\ datalayout
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\ declare
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\ default
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\ define
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\ deplibs
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\ dereferenceable
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\ distinct
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\ dllexport
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\ dllimport
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\ dso_local
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\ dso_preemptable
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\ except
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\ external
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\ externally_initialized
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\ extern_weak
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\ fastcc
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\ tailcc
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\ filter
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\ from
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\ gc
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\ global
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\ hhvmcc
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\ hhvm_ccc
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\ hidden
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\ immarg
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\ initialexec
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\ inlinehint
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\ inreg
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\ inteldialect
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\ intel_ocl_bicc
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\ internal
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\ linkonce
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\ linkonce_odr
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\ localdynamic
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\ localexec
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\ local_unnamed_addr
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\ minsize
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\ module
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\ monotonic
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\ msp430_intrcc
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\ mustprogress
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\ musttail
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\ naked
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\ nest
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\ noalias
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\ nobuiltin
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\ nocapture
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\ noimplicitfloat
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\ noinline
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\ nonlazybind
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\ nonnull
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\ norecurse
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\ noredzone
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\ noreturn
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\ noundef
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\ nounwind
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\ optnone
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\ optsize
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\ personality
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\ private
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\ protected
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\ ptx_device
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\ ptx_kernel
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\ readnone
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\ readonly
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\ release
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\ returned
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\ returns_twice
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\ sanitize_address
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\ sanitize_memory
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\ sanitize_thread
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\ section
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\ seq_cst
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\ sideeffect
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\ signext
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\ syncscope
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\ source_filename
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\ speculatable
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\ spir_func
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\ spir_kernel
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\ sret
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\ nossp
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\ ssp
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\ sspreq
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\ sspstrong
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\ strictfp
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\ swiftcc
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\ swiftself
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\ tail
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\ target
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\ thread_local
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\ to
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\ triple
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\ unnamed_addr
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\ unordered
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\ uselistorder
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\ uselistorder_bb
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\ uwtable
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\ volatile
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\ weak
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\ weak_odr
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\ within
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\ writeonly
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\ x86_64_sysvcc
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\ win64cc
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\ x86_fastcallcc
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\ x86_stdcallcc
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\ x86_thiscallcc
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\ zeroext
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" Obsolete keywords.
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syn keyword llvmError getresult begin end
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" Misc syntax.
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syn match llvmNoName /[%@!]\d\+\>/
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syn match llvmNumber /-\?\<\d\+\>/
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syn match llvmFloat /-\?\<\d\+\.\d*\(e[+-]\d\+\)\?\>/
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syn match llvmFloat /\<0x\x\+\>/
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syn keyword llvmBoolean true false
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syn keyword llvmConstant zeroinitializer undef null none
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syn match llvmComment /;.*$/
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syn region llvmString start=/"/ skip=/\\"/ end=/"/
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syn match llvmLabel /[-a-zA-Z$._][-a-zA-Z$._0-9]*:/
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syn match llvmIdentifier /[%@][-a-zA-Z$._][-a-zA-Z$._0-9]*/
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" Named metadata and specialized metadata keywords.
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syn match llvmIdentifier /![-a-zA-Z$._][-a-zA-Z$._0-9]*\ze\s*$/
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syn match llvmIdentifier /![-a-zA-Z$._][-a-zA-Z$._0-9]*\ze\s*[=!]/
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syn match llvmType /!\zs\a\+\ze\s*(/
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syn match llvmConstant /\<DW_TAG_[a-z_]\+\>/
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syn match llvmConstant /\<DW_ATE_[a-zA-Z_]\+\>/
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syn match llvmConstant /\<DW_OP_[a-zA-Z0-9_]\+\>/
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syn match llvmConstant /\<DW_LANG_[a-zA-Z0-9_]\+\>/
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syn match llvmConstant /\<DW_VIRTUALITY_[a-z_]\+\>/
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syn match llvmConstant /\<DIFlag[A-Za-z]\+\>/
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" Syntax-highlight lit test commands and bug numbers.
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syn match llvmSpecialComment /;\s*PR\d*\s*$/
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syn match llvmSpecialComment /;\s*REQUIRES:.*$/
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syn match llvmSpecialComment /;\s*RUN:.*$/
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syn match llvmSpecialComment /;\s*ALLOW_RETRIES:.*$/
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syn match llvmSpecialComment /;\s*CHECK:.*$/
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syn match llvmSpecialComment "\v;\s*CHECK-(NEXT|NOT|DAG|SAME|LABEL):.*$"
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syn match llvmSpecialComment /;\s*XFAIL:.*$/
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if version >= 508 || !exists("did_c_syn_inits")
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if version < 508
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let did_c_syn_inits = 1
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command -nargs=+ HiLink hi link <args>
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else
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command -nargs=+ HiLink hi def link <args>
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endif
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HiLink llvmType Type
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HiLink llvmStatement Statement
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HiLink llvmNumber Number
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HiLink llvmComment Comment
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HiLink llvmString String
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HiLink llvmLabel Label
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HiLink llvmKeyword Keyword
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HiLink llvmBoolean Boolean
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HiLink llvmFloat Float
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HiLink llvmNoName Identifier
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HiLink llvmConstant Constant
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HiLink llvmSpecialComment SpecialComment
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HiLink llvmError Error
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HiLink llvmIdentifier Identifier
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delcommand HiLink
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endif
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let b:current_syntax = "llvm"
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