sys_wasm.go

     1  // Copyright 2018 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  package runtime
     6  
     7  import (
     8  	"internal/goarch"
     9  	"internal/runtime/sys"
    10  	"unsafe"
    11  )
    12  
    13  type m0Stack struct {
    14  	_ [8192 * sys.StackGuardMultiplier]byte
    15  }
    16  
    17  var wasmStack m0Stack
    18  
    19  func wasmDiv()
    20  
    21  func wasmTruncS()
    22  func wasmTruncU()
    23  
    24  //go:wasmimport gojs runtime.wasmExit
    25  func wasmExit(code int32)
    26  
    27  // adjust Gobuf as it if executed a call to fn with context ctxt
    28  // and then stopped before the first instruction in fn.
    29  func gostartcall(buf *gobuf, fn, ctxt unsafe.Pointer) {
    30  	sp := buf.sp
    31  	sp -= goarch.PtrSize
    32  	*(*uintptr)(unsafe.Pointer(sp)) = buf.pc
    33  	buf.sp = sp
    34  	buf.pc = uintptr(fn)
    35  	buf.ctxt = ctxt
    36  }
    37  
    38  func notInitialized() // defined in assembly, call notInitialized1
    39  
    40  // Called if a wasmexport function is called before runtime initialization
    41  //
    42  //go:nosplit
    43  func notInitialized1() {
    44  	writeErrStr("runtime: wasmexport function called before runtime initialization\n")
    45  	if isarchive || islibrary {
    46  		writeErrStr("\tcall _initialize first\n")
    47  	} else {
    48  		writeErrStr("\tcall _start first\n")
    49  	}
    50  }
    51
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