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49 lines
2.0 KiB
Go
49 lines
2.0 KiB
Go
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// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package obj
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// This file defines the IDs for PCDATA and FUNCDATA instructions
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// in Go binaries. It is included by assembly sources, so it must
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// be written using #defines.
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//
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// The Go compiler also #includes this file, for now.
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//
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// symtab.go also contains a copy of these constants.
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// Pseudo-assembly statements.
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// GO_ARGS, GO_RESULTS_INITIALIZED, and NO_LOCAL_POINTERS are macros
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// that communicate to the runtime information about the location and liveness
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// of pointers in an assembly function's arguments, results, and stack frame.
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// This communication is only required in assembly functions that make calls
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// to other functions that might be preempted or grow the stack.
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// NOSPLIT functions that make no calls do not need to use these macros.
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// GO_ARGS indicates that the Go prototype for this assembly function
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// defines the pointer map for the function's arguments.
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// GO_ARGS should be the first instruction in a function that uses it.
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// It can be omitted if there are no arguments at all.
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// GO_ARGS is inserted implicitly by the linker for any function
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// that also has a Go prototype and therefore is usually not necessary
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// to write explicitly.
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// GO_RESULTS_INITIALIZED indicates that the assembly function
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// has initialized the stack space for its results and that those results
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// should be considered live for the remainder of the function.
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// NO_LOCAL_POINTERS indicates that the assembly function stores
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// no pointers to heap objects in its local stack variables.
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// ArgsSizeUnknown is set in Func.argsize to mark all functions
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// whose argument size is unknown (C vararg functions, and
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// assembly code without an explicit specification).
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// This value is generated by the compiler, assembler, or linker.
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const (
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PCDATA_StackMapIndex = 0
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FUNCDATA_ArgsPointerMaps = 0
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FUNCDATA_LocalsPointerMaps = 1
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ArgsSizeUnknown = -0x80000000
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)
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