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zig: 0.10 fix macOS build

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Relevant upstream issue: ziglang/zig#14559

The patch is a backport of fixes that landed in zig-master and can
be removed with zig-0.11 release.

Additionally, make sure we link statically against LLVM to avoid
unpleasant runtime surprises originating from mixing static and
dynamic LLVM libraries.

Finally, unbreak Zig 0.10.1 on macOS.
This commit is contained in:
Jakub Konka 2023-03-14 10:25:14 +01:00
parent 35e37ef51a
commit 18c80c166f
3 changed files with 377 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

13
pkgs/development/compilers/zig/0.10.nix
View file

@ -35,6 +35,12 @@ stdenv.mkDerivation rec {
llvm
]);
patches = [
# Backport alignment related panics from zig-master to 0.10.
# Upstream issue: https://github.com/ziglang/zig/issues/14559
./zig_14559.patch
];
preBuild = ''
export HOME=$TMPDIR;
'';
@ -49,6 +55,9 @@ stdenv.mkDerivation rec {
# file RPATH_CHANGE could not write new RPATH
"-DCMAKE_SKIP_BUILD_RPATH=ON"
# always link against static build of LLVM
"-DZIG_STATIC_LLVM=ON"
# ensure determinism in the compiler build
"-DZIG_TARGET_MCPU=baseline"
];
@ -75,9 +84,5 @@ stdenv.mkDerivation rec {
license = licenses.mit;
maintainers = with maintainers; [ aiotter andrewrk AndersonTorres ];
platforms = platforms.unix;
# Build fails on Darwin on both AArch64 and x86_64:
# https://github.com/NixOS/nixpkgs/pull/210324#issuecomment-1381313616
# https://github.com/NixOS/nixpkgs/pull/210324#issuecomment-1381236045
broken = stdenv.isDarwin;
};
}

367
pkgs/development/compilers/zig/zig_14559.patch Normal file
View file

@ -0,0 +1,367 @@
From 405801d8a8be734425eca4f3eebc56287804ac93 Mon Sep 17 00:00:00 2001
From: Jakub Konka <kubkon@jakubkonka.com>
Date: Sun, 5 Feb 2023 10:04:34 +0100
Subject: [PATCH] macho: temp fix alignment and enable some logs
---
src/link/MachO/Object.zig | 80 ++++++++++++++++++++++++++------------
src/link/MachO/ZldAtom.zig | 29 +++++++-------
src/link/MachO/zld.zig | 22 +++++------
3 files changed, 79 insertions(+), 52 deletions(-)
diff --git a/src/link/MachO/Object.zig b/src/link/MachO/Object.zig
index 401184da515..05638c1f858 100644
--- a/src/link/MachO/Object.zig
+++ b/src/link/MachO/Object.zig
@@ -54,12 +54,18 @@ atom_by_index_table: []AtomIndex = undefined,
/// Can be undefined as set together with in_symtab.
globals_lookup: []i64 = undefined,
+/// All relocs sorted and flattened.
+relocs: std.ArrayListUnmanaged(macho.relocation_info) = .{},
+sect_relocs_lookup: std.ArrayListUnmanaged(u32) = .{},
+
atoms: std.ArrayListUnmanaged(AtomIndex) = .{},
pub fn deinit(self: *Object, gpa: Allocator) void {
self.atoms.deinit(gpa);
gpa.free(self.name);
gpa.free(self.contents);
+ self.relocs.deinit(gpa);
+ self.sect_relocs_lookup.deinit(gpa);
if (self.in_symtab) |_| {
gpa.free(self.source_symtab_lookup);
gpa.free(self.source_address_lookup);
@@ -101,6 +107,10 @@ pub fn parse(self: *Object, allocator: Allocator, cpu_arch: std.Target.Cpu.Arch)
return error.MismatchedCpuArchitecture;
}
+ const nsects = self.getSourceSections().len;
+ try self.sect_relocs_lookup.resize(allocator, nsects);
+ mem.set(u32, self.sect_relocs_lookup.items, 0);
+
var it = LoadCommandIterator{
.ncmds = self.header.ncmds,
.buffer = self.contents[@sizeOf(macho.mach_header_64)..][0..self.header.sizeofcmds],
@@ -110,13 +120,11 @@ pub fn parse(self: *Object, allocator: Allocator, cpu_arch: std.Target.Cpu.Arch)
.SYMTAB => {
const symtab = cmd.cast(macho.symtab_command).?;
self.in_symtab = @ptrCast(
- [*]const macho.nlist_64,
- @alignCast(@alignOf(macho.nlist_64), &self.contents[symtab.symoff]),
+ [*]align(1) const macho.nlist_64,
+ self.contents.ptr + symtab.symoff,
)[0..symtab.nsyms];
self.in_strtab = self.contents[symtab.stroff..][0..symtab.strsize];
- const nsects = self.getSourceSections().len;
-
self.symtab = try allocator.alloc(macho.nlist_64, self.in_symtab.?.len + nsects);
self.source_symtab_lookup = try allocator.alloc(u32, self.in_symtab.?.len);
self.strtab_lookup = try allocator.alloc(u32, self.in_symtab.?.len);
@@ -192,6 +200,17 @@ const SymbolAtIndex = struct {
return mem.sliceTo(@ptrCast([*:0]const u8, ctx.in_strtab.?.ptr + off), 0);
}
+ fn getSymbolSeniority(self: SymbolAtIndex, ctx: Context) u2 {
+ const sym = self.getSymbol(ctx);
+ if (!sym.ext()) {
+ const sym_name = self.getSymbolName(ctx);
+ if (mem.startsWith(u8, sym_name, "l") or mem.startsWith(u8, sym_name, "L")) return 0;
+ return 1;
+ }
+ if (sym.weakDef() or sym.pext()) return 2;
+ return 3;
+ }
+
/// Performs lexicographic-like check.
/// * lhs and rhs defined
/// * if lhs == rhs
@@ -206,23 +225,15 @@ const SymbolAtIndex = struct {
if (lhs.sect() and rhs.sect()) {
if (lhs.n_value == rhs.n_value) {
if (lhs.n_sect == rhs.n_sect) {
- if (lhs.ext() and rhs.ext()) {
- if ((lhs.pext() or lhs.weakDef()) and (rhs.pext() or rhs.weakDef())) {
- return false;
- } else return rhs.pext() or rhs.weakDef();
- } else {
- const lhs_name = lhs_index.getSymbolName(ctx);
- const lhs_temp = mem.startsWith(u8, lhs_name, "l") or mem.startsWith(u8, lhs_name, "L");
- const rhs_name = rhs_index.getSymbolName(ctx);
- const rhs_temp = mem.startsWith(u8, rhs_name, "l") or mem.startsWith(u8, rhs_name, "L");
- if (lhs_temp and rhs_temp) {
- return false;
- } else return rhs_temp;
- }
+ const lhs_senior = lhs_index.getSymbolSeniority(ctx);
+ const rhs_senior = rhs_index.getSymbolSeniority(ctx);
+ if (lhs_senior == rhs_senior) {
+ return lessThanByNStrx(ctx, lhs_index, rhs_index);
+ } else return lhs_senior < rhs_senior;
} else return lhs.n_sect < rhs.n_sect;
} else return lhs.n_value < rhs.n_value;
} else if (lhs.undf() and rhs.undf()) {
- return false;
+ return lessThanByNStrx(ctx, lhs_index, rhs_index);
} else return rhs.undf();
}
@@ -393,6 +404,16 @@ pub fn splitIntoAtoms(self: *Object, zld: *Zld, object_id: u31) !void {
zld.sections.items(.header)[out_sect_id].sectName(),
});
+ // Parse all relocs for the input section, and sort in descending order.
+ // Previously, I have wrongly assumed the compilers output relocations for each
+ // section in a sorted manner which is simply not true.
+ const start = @intCast(u32, self.relocs.items.len);
+ if (self.getSourceRelocs(section.header)) |relocs| {
+ try self.relocs.appendUnalignedSlice(gpa, relocs);
+ std.sort.sort(macho.relocation_info, self.relocs.items[start..], {}, relocGreaterThan);
+ }
+ self.sect_relocs_lookup.items[section.id] = start;
+
const cpu_arch = zld.options.target.cpu.arch;
const sect_loc = filterSymbolsBySection(symtab[sect_sym_index..], sect_id + 1);
const sect_start_index = sect_sym_index + sect_loc.index;
@@ -559,7 +580,7 @@ pub fn getSourceSections(self: Object) []const macho.section_64 {
} else unreachable;
}
-pub fn parseDataInCode(self: Object) ?[]const macho.data_in_code_entry {
+pub fn parseDataInCode(self: Object) ?[]align(1) const macho.data_in_code_entry {
var it = LoadCommandIterator{
.ncmds = self.header.ncmds,
.buffer = self.contents[@sizeOf(macho.mach_header_64)..][0..self.header.sizeofcmds],
@@ -569,10 +590,7 @@ pub fn parseDataInCode(self: Object) ?[]const macho.data_in_code_entry {
.DATA_IN_CODE => {
const dice = cmd.cast(macho.linkedit_data_command).?;
const ndice = @divExact(dice.datasize, @sizeOf(macho.data_in_code_entry));
- return @ptrCast(
- [*]const macho.data_in_code_entry,
- @alignCast(@alignOf(macho.data_in_code_entry), &self.contents[dice.dataoff]),
- )[0..ndice];
+ return @ptrCast([*]align(1) const macho.data_in_code_entry, self.contents.ptr + dice.dataoff)[0..ndice];
},
else => {},
}
@@ -632,11 +650,23 @@ pub fn getSectionAliasSymbolPtr(self: *Object, sect_id: u8) *macho.nlist_64 {
return &self.symtab[self.getSectionAliasSymbolIndex(sect_id)];
}
-pub fn getRelocs(self: Object, sect: macho.section_64) []align(1) const macho.relocation_info {
- if (sect.nreloc == 0) return &[0]macho.relocation_info{};
+fn getSourceRelocs(self: Object, sect: macho.section_64) ?[]align(1) const macho.relocation_info {
+ if (sect.nreloc == 0) return null;
return @ptrCast([*]align(1) const macho.relocation_info, self.contents.ptr + sect.reloff)[0..sect.nreloc];
}
+pub fn getRelocs(self: Object, sect_id: u16) []const macho.relocation_info {
+ const sect = self.getSourceSection(sect_id);
+ const start = self.sect_relocs_lookup.items[sect_id];
+ const len = sect.nreloc;
+ return self.relocs.items[start..][0..len];
+}
+
+fn relocGreaterThan(ctx: void, lhs: macho.relocation_info, rhs: macho.relocation_info) bool {
+ _ = ctx;
+ return lhs.r_address > rhs.r_address;
+}
+
pub fn getSymbolName(self: Object, index: u32) []const u8 {
const strtab = self.in_strtab.?;
const sym = self.symtab[index];
diff --git a/src/link/MachO/ZldAtom.zig b/src/link/MachO/ZldAtom.zig
index 817aa816625..b42309598d7 100644
--- a/src/link/MachO/ZldAtom.zig
+++ b/src/link/MachO/ZldAtom.zig
@@ -465,7 +465,7 @@ pub fn resolveRelocs(
zld: *Zld,
atom_index: AtomIndex,
atom_code: []u8,
- atom_relocs: []align(1) const macho.relocation_info,
+ atom_relocs: []const macho.relocation_info,
reverse_lookup: []u32,
) !void {
const arch = zld.options.target.cpu.arch;
@@ -540,7 +540,7 @@ fn resolveRelocsArm64(
zld: *Zld,
atom_index: AtomIndex,
atom_code: []u8,
- atom_relocs: []align(1) const macho.relocation_info,
+ atom_relocs: []const macho.relocation_info,
reverse_lookup: []u32,
context: RelocContext,
) !void {
@@ -579,7 +579,6 @@ fn resolveRelocsArm64(
}
const target = parseRelocTarget(zld, atom_index, rel, reverse_lookup);
- const rel_offset = @intCast(u32, rel.r_address - context.base_offset);
log.debug(" RELA({s}) @ {x} => %{d} ('{s}') in object({?})", .{
@tagName(rel_type),
@@ -589,6 +588,7 @@ fn resolveRelocsArm64(
target.file,
});
+ const rel_offset = @intCast(u32, rel.r_address - context.base_offset);
const source_addr = blk: {
const source_sym = zld.getSymbol(atom.getSymbolWithLoc());
break :blk source_sym.n_value + rel_offset;
@@ -596,7 +596,7 @@ fn resolveRelocsArm64(
const is_tlv = is_tlv: {
const source_sym = zld.getSymbol(atom.getSymbolWithLoc());
const header = zld.sections.items(.header)[source_sym.n_sect - 1];
- break :is_tlv header.@"type"() == macho.S_THREAD_LOCAL_VARIABLES;
+ break :is_tlv header.type() == macho.S_THREAD_LOCAL_VARIABLES;
};
const target_addr = try getRelocTargetAddress(zld, rel, target, is_tlv);
@@ -831,7 +831,7 @@ fn resolveRelocsX86(
zld: *Zld,
atom_index: AtomIndex,
atom_code: []u8,
- atom_relocs: []align(1) const macho.relocation_info,
+ atom_relocs: []const macho.relocation_info,
reverse_lookup: []u32,
context: RelocContext,
) !void {
@@ -877,7 +877,7 @@ fn resolveRelocsX86(
const is_tlv = is_tlv: {
const source_sym = zld.getSymbol(atom.getSymbolWithLoc());
const header = zld.sections.items(.header)[source_sym.n_sect - 1];
- break :is_tlv header.@"type"() == macho.S_THREAD_LOCAL_VARIABLES;
+ break :is_tlv header.type() == macho.S_THREAD_LOCAL_VARIABLES;
};
log.debug(" | source_addr = 0x{x}", .{source_addr});
@@ -1015,27 +1015,24 @@ pub fn getAtomCode(zld: *Zld, atom_index: AtomIndex) []const u8 {
return code[offset..][0..code_len];
}
-pub fn getAtomRelocs(zld: *Zld, atom_index: AtomIndex) []align(1) const macho.relocation_info {
+pub fn getAtomRelocs(zld: *Zld, atom_index: AtomIndex) []const macho.relocation_info {
const atom = zld.getAtomPtr(atom_index);
assert(atom.getFile() != null); // Synthetic atom shouldn't need to unique for relocs.
const object = zld.objects.items[atom.getFile().?];
- const source_sect = if (object.getSourceSymbol(atom.sym_index)) |source_sym| blk: {
- const source_sect = object.getSourceSection(source_sym.n_sect - 1);
- assert(!source_sect.isZerofill());
- break :blk source_sect;
+ const source_sect_id = if (object.getSourceSymbol(atom.sym_index)) |source_sym| blk: {
+ break :blk source_sym.n_sect - 1;
} else blk: {
// If there was no matching symbol present in the source symtab, this means
// we are dealing with either an entire section, or part of it, but also
// starting at the beginning.
const nbase = @intCast(u32, object.in_symtab.?.len);
const sect_id = @intCast(u16, atom.sym_index - nbase);
- const source_sect = object.getSourceSection(sect_id);
- assert(!source_sect.isZerofill());
- break :blk source_sect;
+ break :blk sect_id;
};
-
- const relocs = object.getRelocs(source_sect);
+ const source_sect = object.getSourceSection(source_sect_id);
+ assert(!source_sect.isZerofill());
+ const relocs = object.getRelocs(source_sect_id);
if (atom.cached_relocs_start == -1) {
const indexes = if (object.getSourceSymbol(atom.sym_index)) |source_sym| blk: {
diff --git a/src/link/MachO/zld.zig b/src/link/MachO/zld.zig
index 3a2ea79c6ec..cee3f302c08 100644
--- a/src/link/MachO/zld.zig
+++ b/src/link/MachO/zld.zig
@@ -396,7 +396,7 @@ pub const Zld = struct {
break :blk null;
}
- switch (sect.@"type"()) {
+ switch (sect.type()) {
macho.S_4BYTE_LITERALS,
macho.S_8BYTE_LITERALS,
macho.S_16BYTE_LITERALS,
@@ -1701,7 +1701,7 @@ pub const Zld = struct {
break :outer;
}
}
- switch (header.@"type"()) {
+ switch (header.type()) {
macho.S_NON_LAZY_SYMBOL_POINTERS => {
try self.writeGotPointer(count, buffer.writer());
},
@@ -1718,7 +1718,7 @@ pub const Zld = struct {
break :outer;
}
}
- if (header.@"type"() == macho.S_SYMBOL_STUBS) {
+ if (header.type() == macho.S_SYMBOL_STUBS) {
try self.writeStubCode(atom_index, count, buffer.writer());
} else if (mem.eql(u8, header.sectName(), "__stub_helper")) {
try self.writeStubHelperCode(atom_index, buffer.writer());
@@ -1802,7 +1802,7 @@ pub const Zld = struct {
for (slice.items(.header)) |*header, sect_id| {
if (header.size == 0) continue;
if (self.requiresThunks()) {
- if (header.isCode() and !(header.@"type"() == macho.S_SYMBOL_STUBS) and !mem.eql(u8, header.sectName(), "__stub_helper")) continue;
+ if (header.isCode() and !(header.type() == macho.S_SYMBOL_STUBS) and !mem.eql(u8, header.sectName(), "__stub_helper")) continue;
}
var atom_index = slice.items(.first_atom_index)[sect_id];
@@ -1830,7 +1830,7 @@ pub const Zld = struct {
if (self.requiresThunks()) {
for (slice.items(.header)) |header, sect_id| {
if (!header.isCode()) continue;
- if (header.@"type"() == macho.S_SYMBOL_STUBS) continue;
+ if (header.type() == macho.S_SYMBOL_STUBS) continue;
if (mem.eql(u8, header.sectName(), "__stub_helper")) continue;
// Create jump/branch range extenders if needed.
@@ -1994,10 +1994,10 @@ pub const Zld = struct {
const section_precedence: u4 = blk: {
if (header.isCode()) {
if (mem.eql(u8, "__text", header.sectName())) break :blk 0x0;
- if (header.@"type"() == macho.S_SYMBOL_STUBS) break :blk 0x1;
+ if (header.type() == macho.S_SYMBOL_STUBS) break :blk 0x1;
break :blk 0x2;
}
- switch (header.@"type"()) {
+ switch (header.type()) {
macho.S_NON_LAZY_SYMBOL_POINTERS,
macho.S_LAZY_SYMBOL_POINTERS,
=> break :blk 0x0,
@@ -2121,7 +2121,7 @@ pub const Zld = struct {
// Finally, unpack the rest.
for (slice.items(.header)) |header, sect_id| {
- switch (header.@"type"()) {
+ switch (header.type()) {
macho.S_LITERAL_POINTERS,
macho.S_REGULAR,
macho.S_MOD_INIT_FUNC_POINTERS,
@@ -2252,7 +2252,7 @@ pub const Zld = struct {
// Finally, unpack the rest.
const slice = self.sections.slice();
for (slice.items(.header)) |header, sect_id| {
- switch (header.@"type"()) {
+ switch (header.type()) {
macho.S_LITERAL_POINTERS,
macho.S_REGULAR,
macho.S_MOD_INIT_FUNC_POINTERS,
@@ -2707,10 +2707,10 @@ pub const Zld = struct {
}
fn filterDataInCode(
- dices: []const macho.data_in_code_entry,
+ dices: []align(1) const macho.data_in_code_entry,
start_addr: u64,
end_addr: u64,
- ) []const macho.data_in_code_entry {
+ ) []align(1) const macho.data_in_code_entry {
const Predicate = struct {
addr: u64,

3
pkgs/top-level/all-packages.nix
View file

@ -24198,8 +24198,7 @@ with pkgs;
zig_0_10 = darwin.apple_sdk_11_0.callPackage ../development/compilers/zig/0.10.nix {
llvmPackages = llvmPackages_15;
};
# Zig 0.10.1 is broken on Darwin, so use 0.9.1 on Darwin instead.
zig = if stdenv.isDarwin then zig_0_9 else zig_0_10;
zig = zig_0_10;
zimlib = callPackage ../development/libraries/zimlib { };