// Should be a built-in for unsafe.Pointer? // // add should be an internal detail, // but widely used packages access it using linkname. // Notable members of the hall of shame include: // - fortio.org/log // // Do not remove or change the type signature. // See go.dev/issue/67401. // //go:linkname add //go:nosplit func add(p unsafe.Pointer, x uintptr) unsafe.Pointer { … } // getg returns the pointer to the current g. // The compiler rewrites calls to this function into instructions // that fetch the g directly (from TLS or from the dedicated register). func getg() *g // mcall switches from the g to the g0 stack and invokes fn(g), // where g is the goroutine that made the call. // mcall saves g's current PC/SP in g->sched so that it can be restored later. // It is up to fn to arrange for that later execution, typically by recording // g in a data structure, causing something to call ready(g) later. // mcall returns to the original goroutine g later, when g has been rescheduled. // fn must not return at all; typically it ends by calling schedule, to let the m // run other goroutines. // // mcall can only be called from g stacks (not g0, not gsignal). // // This must NOT be go:noescape: if fn is a stack-allocated closure, // fn puts g on a run queue, and g executes before fn returns, the // closure will be invalidated while it is still executing. func mcall(fn func(*g)) // systemstack runs fn on a system stack. // If systemstack is called from the per-OS-thread (g0) stack, or // if systemstack is called from the signal handling (gsignal) stack, // systemstack calls fn directly and returns. // Otherwise, systemstack is being called from the limited stack // of an ordinary goroutine. In this case, systemstack switches // to the per-OS-thread stack, calls fn, and switches back. // It is common to use a func literal as the argument, in order // to share inputs and outputs with the code around the call // to system stack: // // ... set up y ... // systemstack(func() { // x = bigcall(y) // }) // ... use x ... // //go:noescape func systemstack(fn func()) //go:nosplit //go:nowritebarrierrec func badsystemstack() { … } // memclrNoHeapPointers clears n bytes starting at ptr. // // Usually you should use typedmemclr. memclrNoHeapPointers should be // used only when the caller knows that *ptr contains no heap pointers // because either: // // *ptr is initialized memory and its type is pointer-free, or // // *ptr is uninitialized memory (e.g., memory that's being reused // for a new allocation) and hence contains only "junk". // // memclrNoHeapPointers ensures that if ptr is pointer-aligned, and n // is a multiple of the pointer size, then any pointer-aligned, // pointer-sized portion is cleared atomically. Despite the function // name, this is necessary because this function is the underlying // implementation of typedmemclr and memclrHasPointers. See the doc of // memmove for more details. // // The (CPU-specific) implementations of this function are in memclr_*.s. // // memclrNoHeapPointers should be an internal detail, // but widely used packages access it using linkname. // Notable members of the hall of shame include: // - github.com/bytedance/sonic // - github.com/chenzhuoyu/iasm // - github.com/dgraph-io/ristretto // - github.com/outcaste-io/ristretto // // Do not remove or change the type signature. // See go.dev/issue/67401. // //go:linkname memclrNoHeapPointers //go:noescape func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr) //go:linkname reflect_memclrNoHeapPointers reflect.memclrNoHeapPointers func reflect_memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr) { … } // memmove copies n bytes from "from" to "to". // // memmove ensures that any pointer in "from" is written to "to" with // an indivisible write, so that racy reads cannot observe a // half-written pointer. This is necessary to prevent the garbage // collector from observing invalid pointers, and differs from memmove // in unmanaged languages. However, memmove is only required to do // this if "from" and "to" may contain pointers, which can only be the // case if "from", "to", and "n" are all be word-aligned. // // Implementations are in memmove_*.s. // // Outside assembly calls memmove. // // memmove should be an internal detail, // but widely used packages access it using linkname. // Notable members of the hall of shame include: // - github.com/bytedance/sonic // - github.com/cloudwego/dynamicgo // - github.com/ebitengine/purego // - github.com/tetratelabs/wazero // - github.com/ugorji/go/codec // - gvisor.dev/gvisor // - github.com/sagernet/gvisor // // Do not remove or change the type signature. // See go.dev/issue/67401. // //go:linkname memmove //go:noescape func memmove(to, from unsafe.Pointer, n uintptr) //go:linkname reflect_memmove reflect.memmove func reflect_memmove(to, from unsafe.Pointer, n uintptr) { … } const hashLoad … // in internal/bytealg/equal_*.s // // memequal should be an internal detail, // but widely used packages access it using linkname. // Notable members of the hall of shame include: // - github.com/bytedance/sonic // // Do not remove or change the type signature. // See go.dev/issue/67401. // //go:linkname memequal //go:noescape func memequal(a, b unsafe.Pointer, size uintptr) bool // noescape hides a pointer from escape analysis. noescape is // the identity function but escape analysis doesn't think the // output depends on the input. noescape is inlined and currently // compiles down to zero instructions. // USE CAREFULLY! // // noescape should be an internal detail, // but widely used packages access it using linkname. // Notable members of the hall of shame include: // - github.com/bytedance/gopkg // - github.com/ebitengine/purego // - github.com/hamba/avro/v2 // - github.com/puzpuzpuz/xsync/v3 // - github.com/songzhibin97/gkit // // Do not remove or change the type signature. // See go.dev/issue/67401. // //go:linkname noescape //go:nosplit func noescape(p unsafe.Pointer) unsafe.Pointer { … } // noEscapePtr hides a pointer from escape analysis. See noescape. // USE CAREFULLY! // //go:nosplit func noEscapePtr[T any](p *T) *T { … } // Not all cgocallback frames are actually cgocallback, // so not all have these arguments. Mark them uintptr so that the GC // does not misinterpret memory when the arguments are not present. // cgocallback is not called from Go, only from crosscall2. // This in turn calls cgocallbackg, which is where we'll find // pointer-declared arguments. // // When fn is nil (frame is saved g), call dropm instead, // this is used when the C thread is exiting. func cgocallback(fn, frame, ctxt uintptr) func gogo(buf *gobuf) func asminit() func setg(gg *g) func breakpoint() // reflectcall calls fn with arguments described by stackArgs, stackArgsSize, // frameSize, and regArgs. // // Arguments passed on the stack and space for return values passed on the stack // must be laid out at the space pointed to by stackArgs (with total length // stackArgsSize) according to the ABI. // // stackRetOffset must be some value <= stackArgsSize that indicates the // offset within stackArgs where the return value space begins. // // frameSize is the total size of the argument frame at stackArgs and must // therefore be >= stackArgsSize. It must include additional space for spilling // register arguments for stack growth and preemption. // // TODO(mknyszek): Once we don't need the additional spill space, remove frameSize, // since frameSize will be redundant with stackArgsSize. // // Arguments passed in registers must be laid out in regArgs according to the ABI. // regArgs will hold any return values passed in registers after the call. // // reflectcall copies stack arguments from stackArgs to the goroutine stack, and // then copies back stackArgsSize-stackRetOffset bytes back to the return space // in stackArgs once fn has completed. It also "unspills" argument registers from // regArgs before calling fn, and spills them back into regArgs immediately // following the call to fn. If there are results being returned on the stack, // the caller should pass the argument frame type as stackArgsType so that // reflectcall can execute appropriate write barriers during the copy. // // reflectcall expects regArgs.ReturnIsPtr to be populated indicating which // registers on the return path will contain Go pointers. It will then store // these pointers in regArgs.Ptrs such that they are visible to the GC. // // Package reflect passes a frame type. In package runtime, there is only // one call that copies results back, in callbackWrap in syscall_windows.go, and it // does NOT pass a frame type, meaning there are no write barriers invoked. See that // call site for justification. // // Package reflect accesses this symbol through a linkname. // // Arguments passed through to reflectcall do not escape. The type is used // only in a very limited callee of reflectcall, the stackArgs are copied, and // regArgs is only used in the reflectcall frame. // //go:noescape func reflectcall(stackArgsType *_type, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) // procyield should be an internal detail, // but widely used packages access it using linkname. // Notable members of the hall of shame include: // - github.com/sagernet/sing-tun // - github.com/slackhq/nebula // - golang.zx2c4.com/wireguard // // Do not remove or change the type signature. // See go.dev/issue/67401. // //go:linkname procyield func procyield(cycles uint32) type neverCallThisFunction … // goexit is the return stub at the top of every goroutine call stack. // Each goroutine stack is constructed as if goexit called the // goroutine's entry point function, so that when the entry point // function returns, it will return to goexit, which will call goexit1 // to perform the actual exit. // // This function must never be called directly. Call goexit1 instead. // gentraceback assumes that goexit terminates the stack. A direct // call on the stack will cause gentraceback to stop walking the stack // prematurely and if there is leftover state it may panic. func goexit(neverCallThisFunction) // publicationBarrier performs a store/store barrier (a "publication" // or "export" barrier). Some form of synchronization is required // between initializing an object and making that object accessible to // another processor. Without synchronization, the initialization // writes and the "publication" write may be reordered, allowing the // other processor to follow the pointer and observe an uninitialized // object. In general, higher-level synchronization should be used, // such as locking or an atomic pointer write. publicationBarrier is // for when those aren't an option, such as in the implementation of // the memory manager. // // There's no corresponding barrier for the read side because the read // side naturally has a data dependency order. All architectures that // Go supports or seems likely to ever support automatically enforce // data dependency ordering. func publicationBarrier() //go:noescape func asmcgocall(fn, arg unsafe.Pointer) int32 func morestack() func morestack_noctxt() func rt0_go() // return0 is a stub used to return 0 from deferproc. // It is called at the very end of deferproc to signal // the calling Go function that it should not jump // to deferreturn. // in asm_*.s func return0() // in asm_*.s // not called directly; definitions here supply type information for traceback. // These must have the same signature (arg pointer map) as reflectcall. func call16(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call32(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call64(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call128(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call256(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call512(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call1024(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call2048(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call4096(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call8192(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call16384(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call32768(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call65536(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call131072(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call262144(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call524288(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call1048576(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call2097152(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call4194304(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call8388608(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call16777216(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call33554432(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call67108864(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call134217728(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call268435456(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call536870912(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func call1073741824(typ, fn, stackArgs unsafe.Pointer, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs) func systemstack_switch() // alignUp rounds n up to a multiple of a. a must be a power of 2. // //go:nosplit func alignUp(n, a uintptr) uintptr { … } // alignDown rounds n down to a multiple of a. a must be a power of 2. // //go:nosplit func alignDown(n, a uintptr) uintptr { … } // divRoundUp returns ceil(n / a). func divRoundUp(n, a uintptr) uintptr { … } // checkASM reports whether assembly runtime checks have passed. func checkASM() bool func memequal_varlen(a, b unsafe.Pointer) bool // bool2int returns 0 if x is false or 1 if x is true. func bool2int(x bool) int { … } // abort crashes the runtime in situations where even throw might not // work. In general it should do something a debugger will recognize // (e.g., an INT3 on x86). A crash in abort is recognized by the // signal handler, which will attempt to tear down the runtime // immediately. func abort() // Called from compiled code; declared for vet; do NOT call from Go. func gcWriteBarrier1() // gcWriteBarrier2 should be an internal detail, // but widely used packages access it using linkname. // Notable members of the hall of shame include: // - github.com/bytedance/sonic // // Do not remove or change the type signature. // See go.dev/issue/67401. // //go:linkname gcWriteBarrier2 func gcWriteBarrier2() func gcWriteBarrier3() func gcWriteBarrier4() func gcWriteBarrier5() func gcWriteBarrier6() func gcWriteBarrier7() func gcWriteBarrier8() func duffzero() func duffcopy() // Called from linker-generated .initarray; declared for go vet; do NOT call from Go. func addmoduledata() // Injected by the signal handler for panicking signals. // Initializes any registers that have fixed meaning at calls but // are scratch in bodies and calls sigpanic. // On many platforms it just jumps to sigpanic. func sigpanic0() var intArgRegs …
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