go funcdata 源码
golang funcdata 代码
文件路径：/src/cmd/internal/objabi/funcdata.go
// Copyright 2013 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 objabi
// This file defines the IDs for PCDATA and FUNCDATA instructions
// in Go binaries.
//
// These must agree with ../../../runtime/funcdata.h and
// ../../../runtime/symtab.go.
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
// 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.
ArgsSizeUnknown = -0x80000000
)
// Special PCDATA values.
const (
// PCDATA_UnsafePoint values.
PCDATA_UnsafePointSafe = -1 // Safe for async preemption
PCDATA_UnsafePointUnsafe = -2 // Unsafe for async preemption
// PCDATA_Restart1(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.
PCDATA_Restart1 = -3
PCDATA_Restart2 = -4
// Like PCDATA_Restart1, but back to function entry if async preempted.
PCDATA_RestartAtEntry = -5
)
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