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const std = @import("std");
const builtin = @import("builtin");
pub fn build(b: *std.Build) void {
const test_step = b.step("test", "Test it");
b.default_step = test_step;
const target = b.standardTargetOptions(.{});
const optimize = b.standardOptimizeOption(.{});
// Unwinding with a frame pointer
//
// getcontext version: zig std
//
// Unwind info type:
// - ELF: DWARF .debug_frame
// - MachO: __unwind_info encodings:
// - x86_64: RBP_FRAME
// - aarch64: FRAME, DWARF
{
const exe = b.addExecutable(.{
.name = "unwind_fp",
.root_module = b.createModule(.{
.root_source_file = b.path("unwind.zig"),
.target = target,
.optimize = optimize,
.unwind_tables = if (target.result.os.tag.isDarwin()) .@"async" else null,
.omit_frame_pointer = false,
}),
});
const run_cmd = b.addRunArtifact(exe);
test_step.dependOn(&run_cmd.step);
}
// Unwinding without a frame pointer
//
// getcontext version: zig std
//
// Unwind info type:
// - ELF: DWARF .eh_frame_hdr + .eh_frame
// - MachO: __unwind_info encodings:
// - x86_64: STACK_IMMD, STACK_IND
// - aarch64: FRAMELESS, DWARF
{
const exe = b.addExecutable(.{
.name = "unwind_nofp",
.root_module = b.createModule(.{
.root_source_file = b.path("unwind.zig"),
.target = target,
.optimize = optimize,
.unwind_tables = .@"async",
.omit_frame_pointer = true,
}),
});
const run_cmd = b.addRunArtifact(exe);
test_step.dependOn(&run_cmd.step);
}
// Unwinding through a C shared library without a frame pointer (libc)
//
// getcontext version: libc
//
// Unwind info type:
// - ELF: DWARF .eh_frame + .debug_frame
// - MachO: __unwind_info encodings:
// - x86_64: STACK_IMMD, STACK_IND
// - aarch64: FRAMELESS, DWARF
{
const c_shared_lib = b.addLibrary(.{
.linkage = .dynamic,
.name = "c_shared_lib",
.root_module = b.createModule(.{
.root_source_file = null,
.target = target,
.optimize = optimize,
.link_libc = true,
.strip = false,
}),
});
if (target.result.os.tag == .windows)
c_shared_lib.root_module.addCMacro("LIB_API", "__declspec(dllexport)");
c_shared_lib.root_module.addCSourceFile(.{
.file = b.path("shared_lib.c"),
.flags = &.{"-fomit-frame-pointer"},
});
const exe = b.addExecutable(.{
.name = "shared_lib_unwind",
.root_module = b.createModule(.{
.root_source_file = b.path("shared_lib_unwind.zig"),
.target = target,
.optimize = optimize,
.unwind_tables = if (target.result.os.tag.isDarwin()) .@"async" else null,
.omit_frame_pointer = true,
}),
});
exe.linkLibrary(c_shared_lib);
const run_cmd = b.addRunArtifact(exe);
test_step.dependOn(&run_cmd.step);
// Separate debug info ELF file
if (target.result.ofmt == .elf) {
const filename = b.fmt("{s}_stripped", .{exe.out_filename});
const stripped_exe = b.addObjCopy(exe.getEmittedBin(), .{
.basename = filename, // set the name for the debuglink
.compress_debug = true,
.strip = .debug,
.extract_to_separate_file = true,
});
const run_stripped = std.Build.Step.Run.create(b, b.fmt("run {s}", .{filename}));
run_stripped.addFileArg(stripped_exe.getOutput());
test_step.dependOn(&run_stripped.step);
}
}
// Unwinding without libc/posix
//
// No "getcontext" or "ucontext_t"
const no_os_targets = [_]std.Target.Os.Tag{ .freestanding, .other };
inline for (no_os_targets) |os_tag| {
const exe = b.addExecutable(.{
.name = "unwind_freestanding",
.root_module = b.createModule(.{
.root_source_file = b.path("unwind_freestanding.zig"),
.target = b.resolveTargetQuery(.{
.cpu_arch = .x86_64,
.os_tag = os_tag,
}),
.optimize = optimize,
.unwind_tables = null,
.omit_frame_pointer = false,
}),
});
// This "freestanding" binary is runnable because it invokes the
// Linux exit syscall directly.
if (builtin.os.tag == .linux and builtin.cpu.arch == .x86_64) {
const run_cmd = b.addRunArtifact(exe);
test_step.dependOn(&run_cmd.step);
} else {
test_step.dependOn(&exe.step);
}
}
}
|
