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const std = @import("std");
const builtin = @import("builtin");
const debug = std.debug;
const testing = std.testing;
noinline fn frame4(expected: *[5]usize, unwound: *[5]usize) void {
expected[0] = @returnAddress();
var context: debug.ThreadContext = undefined;
testing.expect(debug.getContext(&context)) catch @panic("failed to getContext");
const debug_info = debug.getSelfDebugInfo() catch @panic("failed to openSelfDebugInfo");
var it = debug.StackIterator.initWithContext(expected[0], debug_info, &context) catch @panic("failed to initWithContext");
defer it.deinit();
for (unwound) |*addr| {
if (it.next()) |return_address| addr.* = return_address;
}
}
noinline fn frame3(expected: *[5]usize, unwound: *[5]usize) void {
expected[1] = @returnAddress();
frame4(expected, unwound);
}
fn frame2(expected: *[5]usize, unwound: *[5]usize) callconv(.C) void {
expected[2] = @returnAddress();
frame3(expected, unwound);
}
extern fn frame0(
expected: *[5]usize,
unwound: *[5]usize,
frame_2: *const fn (expected: *[5]usize, unwound: *[5]usize) callconv(.C) void,
) void;
pub fn main() !void {
// Disabled until the DWARF unwinder bugs on .aarch64 are solved
if (builtin.omit_frame_pointer and comptime builtin.target.os.tag.isDarwin() and builtin.cpu.arch == .aarch64) return;
if (builtin.target.os.tag.isDarwin() and builtin.cpu.arch == .x86_64) return; // https://github.com/ziglang/zig/issues/21337
if (!std.debug.have_ucontext or !std.debug.have_getcontext) return;
var expected: [5]usize = undefined;
var unwound: [5]usize = undefined;
frame0(&expected, &unwound, &frame2);
try testing.expectEqual(expected, unwound);
}
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