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 internal/abi/symtab.go. 10 11 #define PCDATA_UnsafePoint 0 12 #define PCDATA_StackMapIndex 1 13 #define PCDATA_InlTreeIndex 2 14 #define PCDATA_ArgLiveIndex 3 15 16 #define FUNCDATA_ArgsPointerMaps 0 /* garbage collector blocks */ 17 #define FUNCDATA_LocalsPointerMaps 1 18 #define FUNCDATA_StackObjects 2 19 #define FUNCDATA_InlTree 3 20 #define FUNCDATA_OpenCodedDeferInfo 4 /* info for func with open-coded defers */ 21 #define FUNCDATA_ArgInfo 5 22 #define FUNCDATA_ArgLiveInfo 6 23 #define FUNCDATA_WrapInfo 7 24 25 // Pseudo-assembly statements. 26 27 // GO_ARGS, GO_RESULTS_INITIALIZED, and NO_LOCAL_POINTERS are macros 28 // that communicate to the runtime information about the location and liveness 29 // of pointers in an assembly function's arguments, results, and stack frame. 30 // This communication is only required in assembly functions that make calls 31 // to other functions that might be preempted or grow the stack. 32 // NOSPLIT functions that make no calls do not need to use these macros. 33 34 // GO_ARGS indicates that the Go prototype for this assembly function 35 // defines the pointer map for the function's arguments. 36 // GO_ARGS should be the first instruction in a function that uses it. 37 // It can be omitted if there are no arguments at all. 38 // GO_ARGS is inserted implicitly by the assembler for any function 39 // whose package-qualified symbol name belongs to the current package; 40 // it is therefore usually not necessary to write explicitly. 41 #define GO_ARGS FUNCDATA $FUNCDATA_ArgsPointerMaps, go_args_stackmap(SB) 42 43 // GO_RESULTS_INITIALIZED indicates that the assembly function 44 // has initialized the stack space for its results and that those results 45 // should be considered live for the remainder of the function. 46 #define GO_RESULTS_INITIALIZED PCDATA $PCDATA_StackMapIndex, $1 47 48 // NO_LOCAL_POINTERS indicates that the assembly function stores 49 // no pointers to heap objects in its local stack variables. 50 #define NO_LOCAL_POINTERS FUNCDATA $FUNCDATA_LocalsPointerMaps, no_pointers_stackmap(SB) 51 52 // ArgsSizeUnknown is set in Func.argsize to mark all functions 53 // whose argument size is unknown (C vararg functions, and 54 // assembly code without an explicit specification). 55 // This value is generated by the compiler, assembler, or linker. 56 #define ArgsSizeUnknown 0x80000000 57