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macho: implement exporting anon decls

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This commit is contained in:
Jakub Konka 2023-10-29 17:47:58 +01:00
parent eaca72534c
commit a7a95ce9c4
2 changed files with 73 additions and 53 deletions
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104
src/link/MachO.zig
View File

@ -130,7 +130,7 @@ bindings: BindingTable = .{},
lazy_syms: LazySymbolTable = .{},
/// Table of tracked Decls.
decls: std.AutoArrayHashMapUnmanaged(Module.Decl.Index, DeclMetadata) = .{},
decls: DeclTable = .{},
/// Table of threadlocal variables descriptors.
/// They are emitted in the `__thread_vars` section.
@ -1904,6 +1904,7 @@ pub fn deinit(self: *MachO) void {
m.exports.deinit(gpa);
}
self.decls.deinit(gpa);
self.lazy_syms.deinit(gpa);
self.tlv_table.deinit(gpa);
@ -1911,7 +1912,14 @@ pub fn deinit(self: *MachO) void {
atoms.deinit(gpa);
}
self.unnamed_const_atoms.deinit(gpa);
{
var it = self.anon_decls.iterator();
while (it.next()) |entry| {
entry.value_ptr.exports.deinit(gpa);
}
self.anon_decls.deinit(gpa);
}
self.atom_by_index_table.deinit(gpa);
@ -2689,18 +2697,30 @@ pub fn updateExports(
const gpa = self.base.allocator;
const decl_index = switch (exported) {
.decl_index => |i| i,
.value => |val| {
_ = val;
@panic("TODO: implement MachO linker code for exporting a constant value");
const metadata = switch (exported) {
.decl_index => |decl_index| blk: {
_ = try self.getOrCreateAtomForDecl(decl_index);
break :blk self.decls.getPtr(decl_index).?;
},
.value => |value| self.anon_decls.getPtr(value) orelse blk: {
const first_exp = exports[0];
const res = try self.lowerAnonDecl(value, .none, first_exp.getSrcLoc(mod));
switch (res) {
.ok => {},
.fail => |em| {
// TODO maybe it's enough to return an error here and let Module.processExportsInner
// handle the error?
try mod.failed_exports.ensureUnusedCapacity(mod.gpa, 1);
mod.failed_exports.putAssumeCapacityNoClobber(first_exp, em);
return;
},
}
break :blk self.anon_decls.getPtr(value).?;
},
};
const decl = mod.declPtr(decl_index);
const atom_index = try self.getOrCreateAtomForDecl(decl_index);
const atom_index = metadata.atom;
const atom = self.getAtom(atom_index);
const decl_sym = atom.getSymbol(self);
const decl_metadata = self.decls.getPtr(decl_index).?;
const sym = atom.getSymbol(self);
for (exports) |exp| {
const exp_name = try std.fmt.allocPrint(gpa, "_{}", .{
@ -2712,73 +2732,65 @@ pub fn updateExports(
if (exp.opts.section.unwrap()) |section_name| {
if (!mod.intern_pool.stringEqlSlice(section_name, "__text")) {
try mod.failed_exports.putNoClobber(
mod.gpa,
exp,
try Module.ErrorMsg.create(
try mod.failed_exports.putNoClobber(mod.gpa, exp, try Module.ErrorMsg.create(
gpa,
decl.srcLoc(mod),
exp.getSrcLoc(mod),
"Unimplemented: ExportOptions.section",
.{},
),
);
));
continue;
}
}
if (exp.opts.linkage == .LinkOnce) {
try mod.failed_exports.putNoClobber(
mod.gpa,
exp,
try Module.ErrorMsg.create(
try mod.failed_exports.putNoClobber(mod.gpa, exp, try Module.ErrorMsg.create(
gpa,
decl.srcLoc(mod),
exp.getSrcLoc(mod),
"Unimplemented: GlobalLinkage.LinkOnce",
.{},
),
);
));
continue;
}
const sym_index = decl_metadata.getExport(self, exp_name) orelse blk: {
const sym_index = try self.allocateSymbol();
try decl_metadata.exports.append(gpa, sym_index);
break :blk sym_index;
const global_sym_index = metadata.getExport(self, exp_name) orelse blk: {
const global_sym_index = try self.allocateSymbol();
try metadata.exports.append(gpa, global_sym_index);
break :blk global_sym_index;
};
const sym_loc = SymbolWithLoc{ .sym_index = sym_index };
const sym = self.getSymbolPtr(sym_loc);
sym.* = .{
const global_sym_loc = SymbolWithLoc{ .sym_index = global_sym_index };
const global_sym = self.getSymbolPtr(global_sym_loc);
global_sym.* = .{
.n_strx = try self.strtab.insert(gpa, exp_name),
.n_type = macho.N_SECT | macho.N_EXT,
.n_sect = self.text_section_index.? + 1, // TODO what if we export a variable?
.n_sect = metadata.section + 1,
.n_desc = 0,
.n_value = decl_sym.n_value,
.n_value = sym.n_value,
};
switch (exp.opts.linkage) {
.Internal => {
// Symbol should be hidden, or in MachO lingo, private extern.
// We should also mark the symbol as Weak: n_desc == N_WEAK_DEF.
sym.n_type |= macho.N_PEXT;
sym.n_desc |= macho.N_WEAK_DEF;
global_sym.n_type |= macho.N_PEXT;
global_sym.n_desc |= macho.N_WEAK_DEF;
},
.Strong => {},
.Weak => {
// Weak linkage is specified as part of n_desc field.
// Symbol's n_type is like for a symbol with strong linkage.
sym.n_desc |= macho.N_WEAK_DEF;
global_sym.n_desc |= macho.N_WEAK_DEF;
},
else => unreachable,
}
self.resolveGlobalSymbol(sym_loc) catch |err| switch (err) {
self.resolveGlobalSymbol(global_sym_loc) catch |err| switch (err) {
error.MultipleSymbolDefinitions => {
// TODO: this needs rethinking
const global = self.getGlobal(exp_name).?;
if (sym_loc.sym_index != global.sym_index and global.getFile() != null) {
if (global_sym_loc.sym_index != global.sym_index and global.getFile() != null) {
_ = try mod.failed_exports.put(mod.gpa, exp, try Module.ErrorMsg.create(
gpa,
decl.srcLoc(mod),
exp.getSrcLoc(mod),
\\LinkError: symbol '{s}' defined multiple times
,
.{exp_name},
@ -2886,8 +2898,8 @@ pub fn lowerAnonDecl(
.none => ty.abiAlignment(mod),
else => explicit_alignment,
};
if (self.anon_decls.get(decl_val)) |atom_index| {
const existing_addr = self.getAtom(atom_index).getSymbol(self).n_value;
if (self.anon_decls.get(decl_val)) |metadata| {
const existing_addr = self.getAtom(metadata.atom).getSymbol(self).n_value;
if (decl_alignment.check(existing_addr))
return .ok;
}
@ -2917,14 +2929,17 @@ pub fn lowerAnonDecl(
.ok => |atom_index| atom_index,
.fail => |em| return .{ .fail = em },
};
try self.anon_decls.put(gpa, decl_val, atom_index);
try self.anon_decls.put(gpa, decl_val, .{
.atom = atom_index,
.section = self.data_const_section_index.?,
});
return .ok;
}
pub fn getAnonDeclVAddr(self: *MachO, decl_val: InternPool.Index, reloc_info: link.File.RelocInfo) !u64 {
assert(self.llvm_object == null);
const this_atom_index = self.anon_decls.get(decl_val).?;
const this_atom_index = self.anon_decls.get(decl_val).?.atom;
const sym_index = self.getAtom(this_atom_index).getSymbolIndex().?;
const atom_index = self.getAtomIndexForSymbol(.{ .sym_index = reloc_info.parent_atom_index }).?;
try Atom.addRelocation(self, atom_index, .{
@ -5489,7 +5504,8 @@ const DeclMetadata = struct {
}
};
const AnonDeclTable = std.AutoHashMapUnmanaged(InternPool.Index, Atom.Index);
const DeclTable = std.AutoArrayHashMapUnmanaged(Module.Decl.Index, DeclMetadata);
const AnonDeclTable = std.AutoHashMapUnmanaged(InternPool.Index, DeclMetadata);
const BindingTable = std.AutoArrayHashMapUnmanaged(Atom.Index, std.ArrayListUnmanaged(Atom.Binding));
const UnnamedConstTable = std.AutoArrayHashMapUnmanaged(Module.Decl.Index, std.ArrayListUnmanaged(Atom.Index));
const RebaseTable = std.AutoArrayHashMapUnmanaged(Atom.Index, std.ArrayListUnmanaged(u32));

8
test/behavior/export_builtin.zig
View File

@ -54,7 +54,9 @@ test "exporting using field access" {
test "exporting comptime-known value" {
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_x86_64 and builtin.target.ofmt != .elf) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_x86_64 and
(builtin.target.ofmt != .elf and
builtin.target.ofmt != .macho)) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_c) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
@ -70,7 +72,9 @@ test "exporting comptime-known value" {
test "exporting comptime var" {
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_x86_64 and builtin.target.ofmt != .elf) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_x86_64 and
(builtin.target.ofmt != .elf and
builtin.target.ofmt != .macho)) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_c) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;