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