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link.MachO: support sdata4 pointer encoding (#30846)

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Fixes https://codeberg.org/ziglang/zig/issues/30669

Reviewed-on: https://codeberg.org/ziglang/zig/pulls/30846
Reviewed-by: Andrew Kelley <andrew@ziglang.org>
Co-authored-by: Vladislav Shabanov <vshabanov88@gmail.com>
Co-committed-by: Vladislav Shabanov <vshabanov88@gmail.com>
This commit is contained in:
Vladislav Shabanov 2026-01-15 19:48:16 +01:00 • committed by Andrew Kelley
parent eaa3a4299b
commit 63f345a75a
2 changed files with 129 additions and 29 deletions
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66
test/link/macho.zig
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@ -74,6 +74,7 @@ pub fn testAll(b: *Build, build_opts: BuildOptions) *Step {
macho_step.dependOn(testUnwindInfo(b, .{ .target = default_target }));
macho_step.dependOn(testUnwindInfoNoSubsectionsX64(b, .{ .target = x86_64_target }));
macho_step.dependOn(testUnwindInfoNoSubsectionsArm64(b, .{ .target = aarch64_target }));
macho_step.dependOn(testEhFramePointerEncodingSdata4(b, .{ .target = aarch64_target }));
macho_step.dependOn(testWeakBind(b, .{ .target = x86_64_target }));
macho_step.dependOn(testWeakRef(b, .{ .target = b.resolveTargetQuery(.{
.cpu_arch = .x86_64,
@ -2852,6 +2853,71 @@ fn testUnwindInfo(b: *Build, opts: Options) *Step {
return test_step;
}
fn testEhFramePointerEncodingSdata4(b: *Build, opts: Options) *Step {
const test_step = addTestStep(b, "eh_frame-pointer-encoding-sdata4", opts);
const a_o = addObject(b, opts, .{ .name = "foo", .asm_source_bytes =
\\.global _foo
\\.align 2
\\_foo:
\\ mov w0, #100
\\ ret
\\LEND_foo:
\\
\\.section __TEXT,__gcc_except_tab
\\LLSDA_foo:
\\ .byte 0xff
\\ .byte 0xff
\\ .byte 0x01
\\ .uleb128 0
\\
\\.section __TEXT,__eh_frame,coalesced,no_toc+strip_static_syms+live_support
\\LCIE:
\\ .long LCIE_end - LCIE_start
\\LCIE_start:
\\ .long 0 ; CIE ID
\\ .byte 1 ; Version
\\ .asciz "zLR" ; Augmentation string
\\ .uleb128 1 ; Code alignment factor
\\ .sleb128 -8 ; Data alignment factor
\\ .byte 30 ; Return address register
\\ .uleb128 2 ; Augmentation data length
\\ .byte 0x1b ; LSDA pointer encoding (DW_EH_PE_pcrel | DW_EH_PE_sdata4)
\\ .byte 0x1b ; FDE pointer encoding (DW_EH_PE_pcrel | DW_EH_PE_sdata4)
\\ .byte 0x0c ; DW_CFA_def_cfa
\\ .uleb128 31 ; Reg 31
\\ .uleb128 0 ; Offset 0
\\ .align 3
\\LCIE_end:
\\LFDE:
\\ .long LFDE_end - LFDE_start
\\LFDE_start:
\\ .long LFDE_start - LCIE ; CIE pointer
\\ .long _foo - . ; PC begin
\\ .long LEND_foo - _foo ; PC range
\\ .uleb128 4 ; Augmentation data length
\\ .long LLSDA_foo - . ; LSDA pointer
\\ .align 3
\\LFDE_end:
});
const exe = addExecutable(b, opts, .{ .name = "main", .c_source_bytes =
\\#include <stdio.h>
\\int foo();
\\int main() {
\\ printf("%d\n", foo());
\\ return 0;
\\}
});
exe.root_module.addObject(a_o);
const run = addRunArtifact(exe);
run.expectStdOutEqual("100\n");
test_step.dependOn(&run.step);
return test_step;
}
fn testUnwindInfoNoSubsectionsArm64(b: *Build, opts: Options) *Step {
const test_step = addTestStep(b, "unwind-info-no-subsections-arm64", opts);