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 // The Go compiler also #includes this file, for now. 10 // 11 // symtab.go also contains a copy of these constants. 12 13 #define PCDATA_StackMapIndex 0 14 15 #define FUNCDATA_ArgsPointerMaps 0 /* garbage collector blocks */ 16 #define FUNCDATA_LocalsPointerMaps 1 17 #define FUNCDATA_DeadValueMaps 2 18 19 // Pseudo-assembly statements. 20 21 // GO_ARGS, GO_RESULTS_INITIALIZED, and NO_LOCAL_POINTERS are macros 22 // that communicate to the runtime information about the location and liveness 23 // of pointers in an assembly function's arguments, results, and stack frame. 24 // This communication is only required in assembly functions that make calls 25 // to other functions that might be preempted or grow the stack. 26 // NOSPLIT functions that make no calls do not need to use these macros. 27 28 // GO_ARGS indicates that the Go prototype for this assembly function 29 // defines the pointer map for the function's arguments. 30 // GO_ARGS should be the first instruction in a function that uses it. 31 // It can be omitted if there are no arguments at all. 32 // GO_ARGS is inserted implicitly by the linker for any function 33 // that also has a Go prototype and therefore is usually not necessary 34 // to write explicitly. 35 #define GO_ARGS FUNCDATA $FUNCDATA_ArgsPointerMaps, go_args_stackmap(SB) 36 37 // GO_RESULTS_INITIALIZED indicates that the assembly function 38 // has initialized the stack space for its results and that those results 39 // should be considered live for the remainder of the function. 40 #define GO_RESULTS_INITIALIZED FUNCDATA PCDATA $PCDATA_StackMapIndex, 1 41 42 // NO_LOCAL_POINTERS indicates that the assembly function stores 43 // no pointers to heap objects in its local stack variables. 44 #define NO_LOCAL_POINTERS FUNCDATA $FUNCDATA_LocalsPointerMaps, runtimeno_pointers_stackmap(SB) 45 46 // ArgsSizeUnknown is set in Func.argsize to mark all functions 47 // whose argument size is unknown (C vararg functions, and 48 // assembly code without an explicit specification). 49 // This value is generated by the compiler, assembler, or linker. 50 #define ArgsSizeUnknown 0x80000000 51 52 /*c2go 53 enum { 54 PCDATA_StackMapIndex = 0, 55 FUNCDATA_ArgsPointerMaps = 0, 56 FUNCDATA_LocalsPointerMaps = 1, 57 FUNCDATA_DeadValueMaps = 2, 58 ArgsSizeUnknown = 0x80000000, 59 }; 60 */ 61
