1 // Copyright 2013 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package objabi 6 7 // This file defines the IDs for PCDATA and FUNCDATA instructions 8 // in Go binaries. 9 // 10 // These must agree with ../../../runtime/funcdata.h and 11 // ../../../runtime/symtab.go. 12 13 const ( 14 PCDATA_RegMapIndex = 0 // if !go115ReduceLiveness 15 PCDATA_UnsafePoint = 0 // if go115ReduceLiveness 16 PCDATA_StackMapIndex = 1 17 PCDATA_InlTreeIndex = 2 18 19 FUNCDATA_ArgsPointerMaps = 0 20 FUNCDATA_LocalsPointerMaps = 1 21 FUNCDATA_RegPointerMaps = 2 // if !go115ReduceLiveness 22 FUNCDATA_StackObjects = 3 23 FUNCDATA_InlTree = 4 24 FUNCDATA_OpenCodedDeferInfo = 5 25 26 // ArgsSizeUnknown is set in Func.argsize to mark all functions 27 // whose argument size is unknown (C vararg functions, and 28 // assembly code without an explicit specification). 29 // This value is generated by the compiler, assembler, or linker. 30 ArgsSizeUnknown = -0x80000000 31 ) 32 33 // Special PCDATA values. 34 const ( 35 // PCDATA_RegMapIndex values. 36 // 37 // Only if !go115ReduceLiveness. 38 PCDATA_RegMapUnsafe = PCDATA_UnsafePointUnsafe // Unsafe for async preemption 39 40 // PCDATA_UnsafePoint values. 41 PCDATA_UnsafePointSafe = -1 // Safe for async preemption 42 PCDATA_UnsafePointUnsafe = -2 // Unsafe for async preemption 43 44 // PCDATA_Restart1(2) apply on a sequence of instructions, within 45 // which if an async preemption happens, we should back off the PC 46 // to the start of the sequence when resuming. 47 // We need two so we can distinguish the start/end of the sequence 48 // in case that two sequences are next to each other. 49 PCDATA_Restart1 = -3 50 PCDATA_Restart2 = -4 51 52 // Like PCDATA_Restart1, but back to function entry if async preempted. 53 PCDATA_RestartAtEntry = -5 54 ) 55