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-rw-r--r--src/cmd/internal/objabi/funcdata.go47
1 files changed, 47 insertions, 0 deletions
diff --git a/src/cmd/internal/objabi/funcdata.go b/src/cmd/internal/objabi/funcdata.go
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+// 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
+
+ FUNCDATA_ArgsPointerMaps = 0
+ FUNCDATA_LocalsPointerMaps = 1
+ FUNCDATA_StackObjects = 2
+ FUNCDATA_InlTree = 3
+ FUNCDATA_OpenCodedDeferInfo = 4
+
+ // 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
+)