diff options
Diffstat (limited to 'src/cmd/internal/obj/funcdata.go')
| -rw-r--r-- | src/cmd/internal/obj/funcdata.go | 43 |
1 files changed, 9 insertions, 34 deletions
diff --git a/src/cmd/internal/obj/funcdata.go b/src/cmd/internal/obj/funcdata.go index 62256a3e5f..d5f891096b 100644 --- a/src/cmd/internal/obj/funcdata.go +++ b/src/cmd/internal/obj/funcdata.go @@ -5,44 +5,19 @@ 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. +// in Go binaries. // -// 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. +// These must agree with ../../../runtime/funcdata.h and +// ../../../runtime/symtab.go. -// 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 + + // 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. + ArgsSizeUnknown = -0x80000000 ) |