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