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// Copyright 2023 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package abi // A FuncFlag records bits about a function, passed to the runtime. type FuncFlag uint8 const ( // FuncFlagTopFrame indicates a function that appears at the top of its stack. // The traceback routine stop at such a function and consider that a // successful, complete traversal of the stack. // Examples of TopFrame functions include goexit, which appears // at the top of a user goroutine stack, and mstart, which appears // at the top of a system goroutine stack. FuncFlagTopFrame FuncFlag = 1 << iota // FuncFlagSPWrite indicates a function that writes an arbitrary value to SP // (any write other than adding or subtracting a constant amount). // The traceback routines cannot encode such changes into the // pcsp tables, so the function traceback cannot safely unwind past // SPWrite functions. Stopping at an SPWrite function is considered // to be an incomplete unwinding of the stack. In certain contexts // (in particular garbage collector stack scans) that is a fatal error. FuncFlagSPWrite // FuncFlagAsm indicates that a function was implemented in assembly. FuncFlagAsm ) // A FuncID identifies particular functions that need to be treated // specially by the runtime. // Note that in some situations involving plugins, there may be multiple // copies of a particular special runtime function. type FuncID uint8 const ( // If you add a FuncID, you probably also want to add an entry to the map in // ../../cmd/internal/objabi/funcid.go FuncIDNormal FuncID = iota // not a special function FuncID_abort FuncID_asmcgocall FuncID_asyncPreempt FuncID_cgocallback FuncID_corostart FuncID_debugCallV2 FuncID_gcBgMarkWorker FuncID_goexit FuncID_gogo FuncID_gopanic FuncID_handleAsyncEvent FuncID_mcall FuncID_morestack FuncID_mstart FuncID_panicwrap FuncID_rt0_go FuncID_runfinq FuncID_runtime_main FuncID_sigpanic FuncID_systemstack FuncID_systemstack_switch FuncIDWrapper // any autogenerated code (hash/eq algorithms, method wrappers, etc.) ) // ArgsSizeUnknown is set in Func.argsize to mark all functions // whose argument size is unknown (C vararg functions, and // assembly code without an explicit specification). // This value is generated by the compiler, assembler, or linker. const ArgsSizeUnknown = -0x80000000 // IDs for PCDATA and FUNCDATA tables in Go binaries. // // These must agree with ../../../runtime/funcdata.h. const ( PCDATA_UnsafePoint = 0 PCDATA_StackMapIndex = 1 PCDATA_InlTreeIndex = 2 PCDATA_ArgLiveIndex = 3 FUNCDATA_ArgsPointerMaps = 0 FUNCDATA_LocalsPointerMaps = 1 FUNCDATA_StackObjects = 2 FUNCDATA_InlTree = 3 FUNCDATA_OpenCodedDeferInfo = 4 FUNCDATA_ArgInfo = 5 FUNCDATA_ArgLiveInfo = 6 FUNCDATA_WrapInfo = 7 ) // Special values for the PCDATA_UnsafePoint table. const ( UnsafePointSafe = -1 // Safe for async preemption UnsafePointUnsafe = -2 // Unsafe for async preemption // UnsafePointRestart1(2) apply on a sequence of instructions, within // which if an async preemption happens, we should back off the PC // to the start of the sequence when resuming. // We need two so we can distinguish the start/end of the sequence // in case that two sequences are next to each other. UnsafePointRestart1 = -3 UnsafePointRestart2 = -4 // Like UnsafePointRestart1, but back to function entry if async preempted. UnsafePointRestartAtEntry = -5 )