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 // This file defines the IDs for PCDATA and FUNCDATA instructions 6 // in Go binaries. It is included by assembly sources, so it must 7 // be written using #defines. 8 // 9 // These must agree with symtab.go and ../cmd/internal/obj/funcdata.go. 10 11 #define PCDATA_StackMapIndex 0 12 #define PCDATA_InlTreeIndex 1 13 14 #define FUNCDATA_ArgsPointerMaps 0 /* garbage collector blocks */ 15 #define FUNCDATA_LocalsPointerMaps 1 16 #define FUNCDATA_InlTree 2 17 18 // Pseudo-assembly statements. 19 20 // GO_ARGS, GO_RESULTS_INITIALIZED, and NO_LOCAL_POINTERS are macros 21 // that communicate to the runtime information about the location and liveness 22 // of pointers in an assembly function's arguments, results, and stack frame. 23 // This communication is only required in assembly functions that make calls 24 // to other functions that might be preempted or grow the stack. 25 // NOSPLIT functions that make no calls do not need to use these macros. 26 27 // GO_ARGS indicates that the Go prototype for this assembly function 28 // defines the pointer map for the function's arguments. 29 // GO_ARGS should be the first instruction in a function that uses it. 30 // It can be omitted if there are no arguments at all. 31 // GO_ARGS is inserted implicitly by the linker for any function 32 // that also has a Go prototype and therefore is usually not necessary 33 // to write explicitly. 34 #define GO_ARGS FUNCDATA $FUNCDATA_ArgsPointerMaps, go_args_stackmap(SB) 35 36 // GO_RESULTS_INITIALIZED indicates that the assembly function 37 // has initialized the stack space for its results and that those results 38 // should be considered live for the remainder of the function. 39 #define GO_RESULTS_INITIALIZED PCDATA $PCDATA_StackMapIndex, $1 40 41 // NO_LOCAL_POINTERS indicates that the assembly function stores 42 // no pointers to heap objects in its local stack variables. 43 #define NO_LOCAL_POINTERS FUNCDATA $FUNCDATA_LocalsPointerMaps, runtime·no_pointers_stackmap(SB) 44 45 // ArgsSizeUnknown is set in Func.argsize to mark all functions 46 // whose argument size is unknown (C vararg functions, and 47 // assembly code without an explicit specification). 48 // This value is generated by the compiler, assembler, or linker. 49 #define ArgsSizeUnknown 0x80000000 50