syscall_notstackargs.go RawHistoryFolder

1// SPDX-License-Identifier: Apache-2.0
2// SPDX-FileCopyrightText: 2026 The Ebitengine Authors
3
4//go:build !(ppc64le || s390x)
5
6package purego
7
8import "unsafe"
9
10// callbackArgs is the argument block passed from the assembly trampoline
11// to callbackWrap when C code calls a Go callback registered with NewCallback.
12// The assembly fills in the fields before calling callbackWrap, which uses
13// them to determine which Go function to invoke and where to read its
14// arguments from, and writes the return value back into result.
15//
16// callbackArgs is only used on Unix. On Windows, callbacks are handled by
17// the runtime's own callback mechanism, so this type is compiled but unused,
18// serving only as a stub to satisfy cross-platform compilation.
19type callbackArgs struct {
20	index uintptr
21	// args points to the argument block.
22	//
23	// The structure of the arguments goes
24	// float registers followed by the
25	// integer registers followed by the stack.
26	//
27	// This variable is treated as a contiguous
28	// block of memory containing all of the arguments
29	// for this callback.
30	args unsafe.Pointer
31	// Below are out-args from callbackWrap
32	result [4]uintptr
33}
34
35func (c *callbackArgs) stackFrame() unsafe.Pointer {
36	return nil
37}
38
39func (c *callbackArgs) intFrame() unsafe.Pointer {
40	return nil
41}