chore: vendor go dependencies

1 files changed, 53 insertions, 0 deletions

diff --git a/vendor/github.com/ebitengine/purego/syscall.go b/vendor/github.com/ebitengine/purego/syscall.go
new file mode 100644
index 0000000..c30688d
--- /dev/null
+++ b/vendor/github.com/ebitengine/purego/syscall.go
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build darwin || freebsd || linux || windows
+
+package purego
+
+// CDecl marks a function as being called using the __cdecl calling convention as defined in
+// the [MSDocs] when passed to NewCallback. It must be the first argument to the function.
+// This is only useful on 386 Windows, but it is safe to use on other platforms.
+//
+// [MSDocs]: https://learn.microsoft.com/en-us/cpp/cpp/cdecl?view=msvc-170
+type CDecl struct{}
+
+const (
+	maxArgs     = 15
+	numOfFloats = 8 // arm64 and amd64 both have 8 float registers
+)
+
+type syscall15Args struct {
+	fn, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15 uintptr
+	f1, f2, f3, f4, f5, f6, f7, f8                                       uintptr
+	arm64_r8                                                             uintptr
+}
+
+// SyscallN takes fn, a C function pointer and a list of arguments as uintptr.
+// There is an internal maximum number of arguments that SyscallN can take. It panics
+// when the maximum is exceeded. It returns the result and the libc error code if there is one.
+//
+// NOTE: SyscallN does not properly call functions that have both integer and float parameters.
+// See discussion comment https://github.com/ebiten/purego/pull/1#issuecomment-1128057607
+// for an explanation of why that is.
+//
+// On amd64, if there are more than 8 floats the 9th and so on will be placed incorrectly on the
+// stack.
+//
+// The pragma go:nosplit is not needed at this function declaration because it uses go:uintptrescapes
+// which forces all the objects that the uintptrs point to onto the heap where a stack split won't affect
+// their memory location.
+//
+//go:uintptrescapes
+func SyscallN(fn uintptr, args ...uintptr) (r1, r2, err uintptr) {
+	if fn == 0 {
+		panic("purego: fn is nil")
+	}
+	if len(args) > maxArgs {
+		panic("purego: too many arguments to SyscallN")
+	}
+	// add padding so there is no out-of-bounds slicing
+	var tmp [maxArgs]uintptr
+	copy(tmp[:], args)
+	return syscall_syscall15X(fn, tmp[0], tmp[1], tmp[2], tmp[3], tmp[4], tmp[5], tmp[6], tmp[7], tmp[8], tmp[9], tmp[10], tmp[11], tmp[12], tmp[13], tmp[14])
+}