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Diffstat (limited to 'src/cmd/internal/objabi/funcdata.go')
| -rw-r--r-- | src/cmd/internal/objabi/funcdata.go | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/src/cmd/internal/objabi/funcdata.go b/src/cmd/internal/objabi/funcdata.go new file mode 100644 index 0000000..faa2863 --- /dev/null +++ b/src/cmd/internal/objabi/funcdata.go @@ -0,0 +1,47 @@ +// 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 +) |