// 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 obj // This file defines the IDs for PCDATA and FUNCDATA instructions // in Go binaries. It is included by assembly sources, so it must // be written using #defines. // // The Go compiler also #includes this file, for now. // // symtab.go also contains a copy of these constants. // Pseudo-assembly statements. // GO_ARGS, GO_RESULTS_INITIALIZED, and NO_LOCAL_POINTERS are macros // that communicate to the runtime information about the location and liveness // of pointers in an assembly function's arguments, results, and stack frame. // This communication is only required in assembly functions that make calls // to other functions that might be preempted or grow the stack. // NOSPLIT functions that make no calls do not need to use these macros. // GO_ARGS indicates that the Go prototype for this assembly function // defines the pointer map for the function's arguments. // GO_ARGS should be the first instruction in a function that uses it. // It can be omitted if there are no arguments at all. // GO_ARGS is inserted implicitly by the linker for any function // that also has a Go prototype and therefore is usually not necessary // to write explicitly. // GO_RESULTS_INITIALIZED indicates that the assembly function // has initialized the stack space for its results and that those results // should be considered live for the remainder of the function. // NO_LOCAL_POINTERS indicates that the assembly function stores // no pointers to heap objects in its local stack variables. // 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. const ( PCDATA_StackMapIndex = 0 FUNCDATA_ArgsPointerMaps = 0 FUNCDATA_LocalsPointerMaps = 1 ArgsSizeUnknown = -0x80000000 )