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Diffstat (limited to 'src/internal/abi/symtab.go')
| -rw-r--r-- | src/internal/abi/symtab.go | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/src/internal/abi/symtab.go b/src/internal/abi/symtab.go new file mode 100644 index 0000000..bf6ea82 --- /dev/null +++ b/src/internal/abi/symtab.go @@ -0,0 +1,106 @@ +// 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_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 +) |