Source file src/cmd/internal/objabi/funcdata.go
Documentation: cmd/internal/objabi
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_UnsafePoint = 0 15 PCDATA_StackMapIndex = 1 16 PCDATA_InlTreeIndex = 2 17 18 FUNCDATA_ArgsPointerMaps = 0 19 FUNCDATA_LocalsPointerMaps = 1 20 FUNCDATA_StackObjects = 2 21 FUNCDATA_InlTree = 3 22 FUNCDATA_OpenCodedDeferInfo = 4 23 24 // ArgsSizeUnknown is set in Func.argsize to mark all functions 25 // whose argument size is unknown (C vararg functions, and 26 // assembly code without an explicit specification). 27 // This value is generated by the compiler, assembler, or linker. 28 ArgsSizeUnknown = -0x80000000 29 ) 30 31 // Special PCDATA values. 32 const ( 33 // PCDATA_UnsafePoint values. 34 PCDATA_UnsafePointSafe = -1 // Safe for async preemption 35 PCDATA_UnsafePointUnsafe = -2 // Unsafe for async preemption 36 37 // PCDATA_Restart1(2) apply on a sequence of instructions, within 38 // which if an async preemption happens, we should back off the PC 39 // to the start of the sequence when resuming. 40 // We need two so we can distinguish the start/end of the sequence 41 // in case that two sequences are next to each other. 42 PCDATA_Restart1 = -3 43 PCDATA_Restart2 = -4 44 45 // Like PCDATA_Restart1, but back to function entry if async preempted. 46 PCDATA_RestartAtEntry = -5 47 ) 48