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Merge pull request #17873 from ziglang/elf-archive

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elf: implement archiving input object files
This commit is contained in:
Jakub Konka 2023-11-07 03:22:14 +01:00 committed by GitHub
commit bf0387b6bb
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10 changed files with 904 additions and 512 deletions
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847
lib/std/Build/Step/CheckObject.zig
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@ -405,6 +405,17 @@ pub fn checkInDynamicSection(self: *CheckObject) void {
self.checkExact(label);
}
/// Creates a new check checking specifically symbol table parsed and dumped from the archive
/// file.
pub fn checkInArchiveSymtab(self: *CheckObject) void {
const label = switch (self.obj_format) {
.elf => ElfDumper.archive_symtab_label,
else => @panic("TODO other file formats"),
};
self.checkStart();
self.checkExact(label);
}
/// Creates a new standalone, singular check which allows running simple binary operations
/// on the extracted variables. It will then compare the reduced program with the value of
/// the expected variable.
@ -884,35 +895,177 @@ const ElfDumper = struct {
const symtab_label = "symbol table";
const dynamic_symtab_label = "dynamic symbol table";
const dynamic_section_label = "dynamic section";
const Symtab = struct {
symbols: []align(1) const elf.Elf64_Sym,
strings: []const u8,
fn get(st: Symtab, index: usize) ?elf.Elf64_Sym {
if (index >= st.symbols.len) return null;
return st.symbols[index];
}
fn getName(st: Symtab, index: usize) ?[]const u8 {
const sym = st.get(index) orelse return null;
return getString(st.strings, sym.st_name);
}
};
const Context = struct {
gpa: Allocator,
data: []const u8,
hdr: elf.Elf64_Ehdr,
shdrs: []align(1) const elf.Elf64_Shdr,
phdrs: []align(1) const elf.Elf64_Phdr,
shstrtab: []const u8,
symtab: ?Symtab = null,
dysymtab: ?Symtab = null,
};
const archive_symtab_label = "archive symbol table";
fn parseAndDump(step: *Step, bytes: []const u8) ![]const u8 {
const gpa = step.owner.allocator;
return parseAndDumpArchive(gpa, bytes) catch |err| switch (err) {
error.InvalidArchiveMagicNumber => try parseAndDumpObject(gpa, bytes),
else => |e| return e,
};
}
fn parseAndDumpArchive(gpa: Allocator, bytes: []const u8) ![]const u8 {
var stream = std.io.fixedBufferStream(bytes);
const reader = stream.reader();
const magic = try reader.readBytesNoEof(elf.ARMAG.len);
if (!mem.eql(u8, &magic, elf.ARMAG)) {
return error.InvalidArchiveMagicNumber;
}
var ctx = ArchiveContext{
.gpa = gpa,
.data = bytes,
.strtab = &[0]u8{},
};
defer {
for (ctx.objects.items) |*object| {
gpa.free(object.name);
}
ctx.objects.deinit(gpa);
}
while (true) {
if (stream.pos >= ctx.data.len) break;
if (!mem.isAligned(stream.pos, 2)) stream.pos += 1;
const hdr = try reader.readStruct(elf.ar_hdr);
if (!mem.eql(u8, &hdr.ar_fmag, elf.ARFMAG)) return error.InvalidArchiveHeaderMagicNumber;
const size = try hdr.size();
defer {
_ = stream.seekBy(size) catch {};
}
if (hdr.isSymtab()) {
try ctx.parseSymtab(ctx.data[stream.pos..][0..size], .p32);
continue;
}
if (hdr.isSymtab64()) {
try ctx.parseSymtab(ctx.data[stream.pos..][0..size], .p64);
continue;
}
if (hdr.isStrtab()) {
ctx.strtab = ctx.data[stream.pos..][0..size];
continue;
}
if (hdr.isSymdef() or hdr.isSymdefSorted()) continue;
const name = if (hdr.name()) |name|
try gpa.dupe(u8, name)
else if (try hdr.nameOffset()) |off|
try gpa.dupe(u8, ctx.getString(off))
else
unreachable;
try ctx.objects.append(gpa, .{ .name = name, .off = stream.pos, .len = size });
}
var output = std.ArrayList(u8).init(gpa);
const writer = output.writer();
try ctx.dumpSymtab(writer);
try ctx.dumpObjects(writer);
return output.toOwnedSlice();
}
const ArchiveContext = struct {
gpa: Allocator,
data: []const u8,
symtab: std.ArrayListUnmanaged(ArSymtabEntry) = .{},
strtab: []const u8,
objects: std.ArrayListUnmanaged(struct { name: []const u8, off: usize, len: usize }) = .{},
fn parseSymtab(ctx: *ArchiveContext, raw: []const u8, ptr_width: enum { p32, p64 }) !void {
var stream = std.io.fixedBufferStream(raw);
const reader = stream.reader();
const num = switch (ptr_width) {
.p32 => try reader.readInt(u32, .big),
.p64 => try reader.readInt(u64, .big),
};
const ptr_size: usize = switch (ptr_width) {
.p32 => @sizeOf(u32),
.p64 => @sizeOf(u64),
};
const strtab_off = (num + 1) * ptr_size;
const strtab_len = raw.len - strtab_off;
const strtab = raw[strtab_off..][0..strtab_len];
try ctx.symtab.ensureTotalCapacityPrecise(ctx.gpa, num);
var stroff: usize = 0;
for (0..num) |_| {
const off = switch (ptr_width) {
.p32 => try reader.readInt(u32, .big),
.p64 => try reader.readInt(u64, .big),
};
const name = mem.sliceTo(@as([*:0]const u8, @ptrCast(strtab.ptr + stroff)), 0);
stroff += name.len + 1;
ctx.symtab.appendAssumeCapacity(.{ .off = off, .name = name });
}
}
fn dumpSymtab(ctx: ArchiveContext, writer: anytype) !void {
if (ctx.symtab.items.len == 0) return;
var files = std.AutoHashMap(usize, []const u8).init(ctx.gpa);
defer files.deinit();
try files.ensureUnusedCapacity(@intCast(ctx.objects.items.len));
for (ctx.objects.items) |object| {
files.putAssumeCapacityNoClobber(object.off - @sizeOf(elf.ar_hdr), object.name);
}
var symbols = std.AutoArrayHashMap(usize, std.ArrayList([]const u8)).init(ctx.gpa);
defer {
for (symbols.values()) |*value| {
value.deinit();
}
symbols.deinit();
}
for (ctx.symtab.items) |entry| {
const gop = try symbols.getOrPut(@intCast(entry.off));
if (!gop.found_existing) {
gop.value_ptr.* = std.ArrayList([]const u8).init(ctx.gpa);
}
try gop.value_ptr.append(entry.name);
}
try writer.print("{s}\n", .{archive_symtab_label});
for (symbols.keys(), symbols.values()) |off, values| {
try writer.print("in object {s}\n", .{files.get(off).?});
for (values.items) |value| {
try writer.print("{s}\n", .{value});
}
}
}
fn dumpObjects(ctx: ArchiveContext, writer: anytype) !void {
for (ctx.objects.items) |object| {
try writer.print("object {s}\n", .{object.name});
const output = try parseAndDumpObject(ctx.gpa, ctx.data[object.off..][0..object.len]);
defer ctx.gpa.free(output);
try writer.print("{s}\n", .{output});
}
}
fn getString(ctx: ArchiveContext, off: u32) []const u8 {
assert(off < ctx.strtab.len);
const name = mem.sliceTo(@as([*:'\n']const u8, @ptrCast(ctx.strtab.ptr + off)), 0);
return name[0 .. name.len - 1];
}
const ArSymtabEntry = struct {
name: [:0]const u8,
off: u64,
};
};
fn parseAndDumpObject(gpa: Allocator, bytes: []const u8) ![]const u8 {
var stream = std.io.fixedBufferStream(bytes);
const reader = stream.reader();
@ -924,7 +1077,7 @@ const ElfDumper = struct {
const shdrs = @as([*]align(1) const elf.Elf64_Shdr, @ptrCast(bytes.ptr + hdr.e_shoff))[0..hdr.e_shnum];
const phdrs = @as([*]align(1) const elf.Elf64_Phdr, @ptrCast(bytes.ptr + hdr.e_phoff))[0..hdr.e_phnum];
var ctx = Context{
var ctx = ObjectContext{
.gpa = gpa,
.data = bytes,
.hdr = hdr,
@ -932,14 +1085,14 @@ const ElfDumper = struct {
.phdrs = phdrs,
.shstrtab = undefined,
};
ctx.shstrtab = getSectionContents(ctx, ctx.hdr.e_shstrndx);
ctx.shstrtab = ctx.getSectionContents(ctx.hdr.e_shstrndx);
for (ctx.shdrs, 0..) |shdr, i| switch (shdr.sh_type) {
elf.SHT_SYMTAB, elf.SHT_DYNSYM => {
const raw = getSectionContents(ctx, i);
const raw = ctx.getSectionContents(i);
const nsyms = @divExact(raw.len, @sizeOf(elf.Elf64_Sym));
const symbols = @as([*]align(1) const elf.Elf64_Sym, @ptrCast(raw.ptr))[0..nsyms];
const strings = getSectionContents(ctx, shdr.sh_link);
const strings = ctx.getSectionContents(shdr.sh_link);
switch (shdr.sh_type) {
elf.SHT_SYMTAB => {
@ -964,201 +1117,348 @@ const ElfDumper = struct {
var output = std.ArrayList(u8).init(gpa);
const writer = output.writer();
try dumpHeader(ctx, writer);
try dumpShdrs(ctx, writer);
try dumpPhdrs(ctx, writer);
try dumpDynamicSection(ctx, writer);
try dumpSymtab(ctx, .symtab, writer);
try dumpSymtab(ctx, .dysymtab, writer);
try ctx.dumpHeader(writer);
try ctx.dumpShdrs(writer);
try ctx.dumpPhdrs(writer);
try ctx.dumpDynamicSection(writer);
try ctx.dumpSymtab(.symtab, writer);
try ctx.dumpSymtab(.dysymtab, writer);
return output.toOwnedSlice();
}
inline fn getSectionName(ctx: Context, shndx: usize) []const u8 {
const shdr = ctx.shdrs[shndx];
return getString(ctx.shstrtab, shdr.sh_name);
}
const ObjectContext = struct {
gpa: Allocator,
data: []const u8,
hdr: elf.Elf64_Ehdr,
shdrs: []align(1) const elf.Elf64_Shdr,
phdrs: []align(1) const elf.Elf64_Phdr,
shstrtab: []const u8,
symtab: ?Symtab = null,
dysymtab: ?Symtab = null,
fn getSectionContents(ctx: Context, shndx: usize) []const u8 {
const shdr = ctx.shdrs[shndx];
assert(shdr.sh_offset < ctx.data.len);
assert(shdr.sh_offset + shdr.sh_size <= ctx.data.len);
return ctx.data[shdr.sh_offset..][0..shdr.sh_size];
}
fn dumpHeader(ctx: ObjectContext, writer: anytype) !void {
try writer.writeAll("header\n");
try writer.print("type {s}\n", .{@tagName(ctx.hdr.e_type)});
try writer.print("entry {x}\n", .{ctx.hdr.e_entry});
}
fn getSectionByName(ctx: Context, name: []const u8) ?usize {
for (0..ctx.shdrs.len) |shndx| {
if (mem.eql(u8, getSectionName(ctx, shndx), name)) return shndx;
} else return null;
}
fn dumpPhdrs(ctx: ObjectContext, writer: anytype) !void {
if (ctx.phdrs.len == 0) return;
try writer.writeAll("program headers\n");
for (ctx.phdrs, 0..) |phdr, phndx| {
try writer.print("phdr {d}\n", .{phndx});
try writer.print("type {s}\n", .{fmtPhType(phdr.p_type)});
try writer.print("vaddr {x}\n", .{phdr.p_vaddr});
try writer.print("paddr {x}\n", .{phdr.p_paddr});
try writer.print("offset {x}\n", .{phdr.p_offset});
try writer.print("memsz {x}\n", .{phdr.p_memsz});
try writer.print("filesz {x}\n", .{phdr.p_filesz});
try writer.print("align {x}\n", .{phdr.p_align});
{
const flags = phdr.p_flags;
try writer.writeAll("flags");
if (flags > 0) try writer.writeByte(' ');
if (flags & elf.PF_R != 0) {
try writer.writeByte('R');
}
if (flags & elf.PF_W != 0) {
try writer.writeByte('W');
}
if (flags & elf.PF_X != 0) {
try writer.writeByte('E');
}
if (flags & elf.PF_MASKOS != 0) {
try writer.writeAll("OS");
}
if (flags & elf.PF_MASKPROC != 0) {
try writer.writeAll("PROC");
}
try writer.writeByte('\n');
}
}
}
fn dumpShdrs(ctx: ObjectContext, writer: anytype) !void {
if (ctx.shdrs.len == 0) return;
try writer.writeAll("section headers\n");
for (ctx.shdrs, 0..) |shdr, shndx| {
try writer.print("shdr {d}\n", .{shndx});
try writer.print("name {s}\n", .{ctx.getSectionName(shndx)});
try writer.print("type {s}\n", .{fmtShType(shdr.sh_type)});
try writer.print("addr {x}\n", .{shdr.sh_addr});
try writer.print("offset {x}\n", .{shdr.sh_offset});
try writer.print("size {x}\n", .{shdr.sh_size});
try writer.print("addralign {x}\n", .{shdr.sh_addralign});
// TODO dump formatted sh_flags
}
}
fn dumpDynamicSection(ctx: ObjectContext, writer: anytype) !void {
const shndx = ctx.getSectionByName(".dynamic") orelse return;
const shdr = ctx.shdrs[shndx];
const strtab = ctx.getSectionContents(shdr.sh_link);
const data = ctx.getSectionContents(shndx);
const nentries = @divExact(data.len, @sizeOf(elf.Elf64_Dyn));
const entries = @as([*]align(1) const elf.Elf64_Dyn, @ptrCast(data.ptr))[0..nentries];
try writer.writeAll(ElfDumper.dynamic_section_label ++ "\n");
for (entries) |entry| {
const key = @as(u64, @bitCast(entry.d_tag));
const value = entry.d_val;
const key_str = switch (key) {
elf.DT_NEEDED => "NEEDED",
elf.DT_SONAME => "SONAME",
elf.DT_INIT_ARRAY => "INIT_ARRAY",
elf.DT_INIT_ARRAYSZ => "INIT_ARRAYSZ",
elf.DT_FINI_ARRAY => "FINI_ARRAY",
elf.DT_FINI_ARRAYSZ => "FINI_ARRAYSZ",
elf.DT_HASH => "HASH",
elf.DT_GNU_HASH => "GNU_HASH",
elf.DT_STRTAB => "STRTAB",
elf.DT_SYMTAB => "SYMTAB",
elf.DT_STRSZ => "STRSZ",
elf.DT_SYMENT => "SYMENT",
elf.DT_PLTGOT => "PLTGOT",
elf.DT_PLTRELSZ => "PLTRELSZ",
elf.DT_PLTREL => "PLTREL",
elf.DT_JMPREL => "JMPREL",
elf.DT_RELA => "RELA",
elf.DT_RELASZ => "RELASZ",
elf.DT_RELAENT => "RELAENT",
elf.DT_VERDEF => "VERDEF",
elf.DT_VERDEFNUM => "VERDEFNUM",
elf.DT_FLAGS => "FLAGS",
elf.DT_FLAGS_1 => "FLAGS_1",
elf.DT_VERNEED => "VERNEED",
elf.DT_VERNEEDNUM => "VERNEEDNUM",
elf.DT_VERSYM => "VERSYM",
elf.DT_RELACOUNT => "RELACOUNT",
elf.DT_RPATH => "RPATH",
elf.DT_RUNPATH => "RUNPATH",
elf.DT_INIT => "INIT",
elf.DT_FINI => "FINI",
elf.DT_NULL => "NULL",
else => "UNKNOWN",
};
try writer.print("{s}", .{key_str});
switch (key) {
elf.DT_NEEDED,
elf.DT_SONAME,
elf.DT_RPATH,
elf.DT_RUNPATH,
=> {
const name = getString(strtab, @intCast(value));
try writer.print(" {s}", .{name});
},
elf.DT_INIT_ARRAY,
elf.DT_FINI_ARRAY,
elf.DT_HASH,
elf.DT_GNU_HASH,
elf.DT_STRTAB,
elf.DT_SYMTAB,
elf.DT_PLTGOT,
elf.DT_JMPREL,
elf.DT_RELA,
elf.DT_VERDEF,
elf.DT_VERNEED,
elf.DT_VERSYM,
elf.DT_INIT,
elf.DT_FINI,
elf.DT_NULL,
=> try writer.print(" {x}", .{value}),
elf.DT_INIT_ARRAYSZ,
elf.DT_FINI_ARRAYSZ,
elf.DT_STRSZ,
elf.DT_SYMENT,
elf.DT_PLTRELSZ,
elf.DT_RELASZ,
elf.DT_RELAENT,
elf.DT_RELACOUNT,
=> try writer.print(" {d}", .{value}),
elf.DT_PLTREL => try writer.writeAll(switch (value) {
elf.DT_REL => " REL",
elf.DT_RELA => " RELA",
else => " UNKNOWN",
}),
elf.DT_FLAGS => if (value > 0) {
if (value & elf.DF_ORIGIN != 0) try writer.writeAll(" ORIGIN");
if (value & elf.DF_SYMBOLIC != 0) try writer.writeAll(" SYMBOLIC");
if (value & elf.DF_TEXTREL != 0) try writer.writeAll(" TEXTREL");
if (value & elf.DF_BIND_NOW != 0) try writer.writeAll(" BIND_NOW");
if (value & elf.DF_STATIC_TLS != 0) try writer.writeAll(" STATIC_TLS");
},
elf.DT_FLAGS_1 => if (value > 0) {
if (value & elf.DF_1_NOW != 0) try writer.writeAll(" NOW");
if (value & elf.DF_1_GLOBAL != 0) try writer.writeAll(" GLOBAL");
if (value & elf.DF_1_GROUP != 0) try writer.writeAll(" GROUP");
if (value & elf.DF_1_NODELETE != 0) try writer.writeAll(" NODELETE");
if (value & elf.DF_1_LOADFLTR != 0) try writer.writeAll(" LOADFLTR");
if (value & elf.DF_1_INITFIRST != 0) try writer.writeAll(" INITFIRST");
if (value & elf.DF_1_NOOPEN != 0) try writer.writeAll(" NOOPEN");
if (value & elf.DF_1_ORIGIN != 0) try writer.writeAll(" ORIGIN");
if (value & elf.DF_1_DIRECT != 0) try writer.writeAll(" DIRECT");
if (value & elf.DF_1_TRANS != 0) try writer.writeAll(" TRANS");
if (value & elf.DF_1_INTERPOSE != 0) try writer.writeAll(" INTERPOSE");
if (value & elf.DF_1_NODEFLIB != 0) try writer.writeAll(" NODEFLIB");
if (value & elf.DF_1_NODUMP != 0) try writer.writeAll(" NODUMP");
if (value & elf.DF_1_CONFALT != 0) try writer.writeAll(" CONFALT");
if (value & elf.DF_1_ENDFILTEE != 0) try writer.writeAll(" ENDFILTEE");
if (value & elf.DF_1_DISPRELDNE != 0) try writer.writeAll(" DISPRELDNE");
if (value & elf.DF_1_DISPRELPND != 0) try writer.writeAll(" DISPRELPND");
if (value & elf.DF_1_NODIRECT != 0) try writer.writeAll(" NODIRECT");
if (value & elf.DF_1_IGNMULDEF != 0) try writer.writeAll(" IGNMULDEF");
if (value & elf.DF_1_NOKSYMS != 0) try writer.writeAll(" NOKSYMS");
if (value & elf.DF_1_NOHDR != 0) try writer.writeAll(" NOHDR");
if (value & elf.DF_1_EDITED != 0) try writer.writeAll(" EDITED");
if (value & elf.DF_1_NORELOC != 0) try writer.writeAll(" NORELOC");
if (value & elf.DF_1_SYMINTPOSE != 0) try writer.writeAll(" SYMINTPOSE");
if (value & elf.DF_1_GLOBAUDIT != 0) try writer.writeAll(" GLOBAUDIT");
if (value & elf.DF_1_SINGLETON != 0) try writer.writeAll(" SINGLETON");
if (value & elf.DF_1_STUB != 0) try writer.writeAll(" STUB");
if (value & elf.DF_1_PIE != 0) try writer.writeAll(" PIE");
},
else => try writer.print(" {x}", .{value}),
}
try writer.writeByte('\n');
}
}
fn dumpSymtab(ctx: ObjectContext, comptime @"type": enum { symtab, dysymtab }, writer: anytype) !void {
const symtab = switch (@"type") {
.symtab => ctx.symtab,
.dysymtab => ctx.dysymtab,
} orelse return;
try writer.writeAll(switch (@"type") {
.symtab => symtab_label,
.dysymtab => dynamic_symtab_label,
} ++ "\n");
for (symtab.symbols, 0..) |sym, index| {
try writer.print("{x} {x}", .{ sym.st_value, sym.st_size });
{
if (elf.SHN_LORESERVE <= sym.st_shndx and sym.st_shndx < elf.SHN_HIRESERVE) {
if (elf.SHN_LOPROC <= sym.st_shndx and sym.st_shndx < elf.SHN_HIPROC) {
try writer.print(" LO+{d}", .{sym.st_shndx - elf.SHN_LOPROC});
} else {
const sym_ndx = switch (sym.st_shndx) {
elf.SHN_ABS => "ABS",
elf.SHN_COMMON => "COM",
elf.SHN_LIVEPATCH => "LIV",
else => "UNK",
};
try writer.print(" {s}", .{sym_ndx});
}
} else if (sym.st_shndx == elf.SHN_UNDEF) {
try writer.writeAll(" UND");
} else {
try writer.print(" {x}", .{sym.st_shndx});
}
}
blk: {
const tt = sym.st_type();
const sym_type = switch (tt) {
elf.STT_NOTYPE => "NOTYPE",
elf.STT_OBJECT => "OBJECT",
elf.STT_FUNC => "FUNC",
elf.STT_SECTION => "SECTION",
elf.STT_FILE => "FILE",
elf.STT_COMMON => "COMMON",
elf.STT_TLS => "TLS",
elf.STT_NUM => "NUM",
elf.STT_GNU_IFUNC => "IFUNC",
else => if (elf.STT_LOPROC <= tt and tt < elf.STT_HIPROC) {
break :blk try writer.print(" LOPROC+{d}", .{tt - elf.STT_LOPROC});
} else if (elf.STT_LOOS <= tt and tt < elf.STT_HIOS) {
break :blk try writer.print(" LOOS+{d}", .{tt - elf.STT_LOOS});
} else "UNK",
};
try writer.print(" {s}", .{sym_type});
}
blk: {
const bind = sym.st_bind();
const sym_bind = switch (bind) {
elf.STB_LOCAL => "LOCAL",
elf.STB_GLOBAL => "GLOBAL",
elf.STB_WEAK => "WEAK",
elf.STB_NUM => "NUM",
else => if (elf.STB_LOPROC <= bind and bind < elf.STB_HIPROC) {
break :blk try writer.print(" LOPROC+{d}", .{bind - elf.STB_LOPROC});
} else if (elf.STB_LOOS <= bind and bind < elf.STB_HIOS) {
break :blk try writer.print(" LOOS+{d}", .{bind - elf.STB_LOOS});
} else "UNKNOWN",
};
try writer.print(" {s}", .{sym_bind});
}
const sym_vis = @as(elf.STV, @enumFromInt(sym.st_other));
try writer.print(" {s}", .{@tagName(sym_vis)});
const sym_name = switch (sym.st_type()) {
elf.STT_SECTION => ctx.getSectionName(sym.st_shndx),
else => symtab.getName(index).?,
};
try writer.print(" {s}\n", .{sym_name});
}
}
inline fn getSectionName(ctx: ObjectContext, shndx: usize) []const u8 {
const shdr = ctx.shdrs[shndx];
return getString(ctx.shstrtab, shdr.sh_name);
}
fn getSectionContents(ctx: ObjectContext, shndx: usize) []const u8 {
const shdr = ctx.shdrs[shndx];
assert(shdr.sh_offset < ctx.data.len);
assert(shdr.sh_offset + shdr.sh_size <= ctx.data.len);
return ctx.data[shdr.sh_offset..][0..shdr.sh_size];
}
fn getSectionByName(ctx: ObjectContext, name: []const u8) ?usize {
for (0..ctx.shdrs.len) |shndx| {
if (mem.eql(u8, ctx.getSectionName(shndx), name)) return shndx;
} else return null;
}
};
const Symtab = struct {
symbols: []align(1) const elf.Elf64_Sym,
strings: []const u8,
fn get(st: Symtab, index: usize) ?elf.Elf64_Sym {
if (index >= st.symbols.len) return null;
return st.symbols[index];
}
fn getName(st: Symtab, index: usize) ?[]const u8 {
const sym = st.get(index) orelse return null;
return getString(st.strings, sym.st_name);
}
};
fn getString(strtab: []const u8, off: u32) []const u8 {
assert(off < strtab.len);
return mem.sliceTo(@as([*:0]const u8, @ptrCast(strtab.ptr + off)), 0);
}
fn dumpHeader(ctx: Context, writer: anytype) !void {
try writer.writeAll("header\n");
try writer.print("type {s}\n", .{@tagName(ctx.hdr.e_type)});
try writer.print("entry {x}\n", .{ctx.hdr.e_entry});
}
fn dumpShdrs(ctx: Context, writer: anytype) !void {
if (ctx.shdrs.len == 0) return;
try writer.writeAll("section headers\n");
for (ctx.shdrs, 0..) |shdr, shndx| {
try writer.print("shdr {d}\n", .{shndx});
try writer.print("name {s}\n", .{getSectionName(ctx, shndx)});
try writer.print("type {s}\n", .{fmtShType(shdr.sh_type)});
try writer.print("addr {x}\n", .{shdr.sh_addr});
try writer.print("offset {x}\n", .{shdr.sh_offset});
try writer.print("size {x}\n", .{shdr.sh_size});
try writer.print("addralign {x}\n", .{shdr.sh_addralign});
// TODO dump formatted sh_flags
}
}
fn dumpDynamicSection(ctx: Context, writer: anytype) !void {
const shndx = getSectionByName(ctx, ".dynamic") orelse return;
const shdr = ctx.shdrs[shndx];
const strtab = getSectionContents(ctx, shdr.sh_link);
const data = getSectionContents(ctx, shndx);
const nentries = @divExact(data.len, @sizeOf(elf.Elf64_Dyn));
const entries = @as([*]align(1) const elf.Elf64_Dyn, @ptrCast(data.ptr))[0..nentries];
try writer.writeAll(ElfDumper.dynamic_section_label ++ "\n");
for (entries) |entry| {
const key = @as(u64, @bitCast(entry.d_tag));
const value = entry.d_val;
const key_str = switch (key) {
elf.DT_NEEDED => "NEEDED",
elf.DT_SONAME => "SONAME",
elf.DT_INIT_ARRAY => "INIT_ARRAY",
elf.DT_INIT_ARRAYSZ => "INIT_ARRAYSZ",
elf.DT_FINI_ARRAY => "FINI_ARRAY",
elf.DT_FINI_ARRAYSZ => "FINI_ARRAYSZ",
elf.DT_HASH => "HASH",
elf.DT_GNU_HASH => "GNU_HASH",
elf.DT_STRTAB => "STRTAB",
elf.DT_SYMTAB => "SYMTAB",
elf.DT_STRSZ => "STRSZ",
elf.DT_SYMENT => "SYMENT",
elf.DT_PLTGOT => "PLTGOT",
elf.DT_PLTRELSZ => "PLTRELSZ",
elf.DT_PLTREL => "PLTREL",
elf.DT_JMPREL => "JMPREL",
elf.DT_RELA => "RELA",
elf.DT_RELASZ => "RELASZ",
elf.DT_RELAENT => "RELAENT",
elf.DT_VERDEF => "VERDEF",
elf.DT_VERDEFNUM => "VERDEFNUM",
elf.DT_FLAGS => "FLAGS",
elf.DT_FLAGS_1 => "FLAGS_1",
elf.DT_VERNEED => "VERNEED",
elf.DT_VERNEEDNUM => "VERNEEDNUM",
elf.DT_VERSYM => "VERSYM",
elf.DT_RELACOUNT => "RELACOUNT",
elf.DT_RPATH => "RPATH",
elf.DT_RUNPATH => "RUNPATH",
elf.DT_INIT => "INIT",
elf.DT_FINI => "FINI",
elf.DT_NULL => "NULL",
else => "UNKNOWN",
};
try writer.print("{s}", .{key_str});
switch (key) {
elf.DT_NEEDED,
elf.DT_SONAME,
elf.DT_RPATH,
elf.DT_RUNPATH,
=> {
const name = getString(strtab, @intCast(value));
try writer.print(" {s}", .{name});
},
elf.DT_INIT_ARRAY,
elf.DT_FINI_ARRAY,
elf.DT_HASH,
elf.DT_GNU_HASH,
elf.DT_STRTAB,
elf.DT_SYMTAB,
elf.DT_PLTGOT,
elf.DT_JMPREL,
elf.DT_RELA,
elf.DT_VERDEF,
elf.DT_VERNEED,
elf.DT_VERSYM,
elf.DT_INIT,
elf.DT_FINI,
elf.DT_NULL,
=> try writer.print(" {x}", .{value}),
elf.DT_INIT_ARRAYSZ,
elf.DT_FINI_ARRAYSZ,
elf.DT_STRSZ,
elf.DT_SYMENT,
elf.DT_PLTRELSZ,
elf.DT_RELASZ,
elf.DT_RELAENT,
elf.DT_RELACOUNT,
=> try writer.print(" {d}", .{value}),
elf.DT_PLTREL => try writer.writeAll(switch (value) {
elf.DT_REL => " REL",
elf.DT_RELA => " RELA",
else => " UNKNOWN",
}),
elf.DT_FLAGS => if (value > 0) {
if (value & elf.DF_ORIGIN != 0) try writer.writeAll(" ORIGIN");
if (value & elf.DF_SYMBOLIC != 0) try writer.writeAll(" SYMBOLIC");
if (value & elf.DF_TEXTREL != 0) try writer.writeAll(" TEXTREL");
if (value & elf.DF_BIND_NOW != 0) try writer.writeAll(" BIND_NOW");
if (value & elf.DF_STATIC_TLS != 0) try writer.writeAll(" STATIC_TLS");
},
elf.DT_FLAGS_1 => if (value > 0) {
if (value & elf.DF_1_NOW != 0) try writer.writeAll(" NOW");
if (value & elf.DF_1_GLOBAL != 0) try writer.writeAll(" GLOBAL");
if (value & elf.DF_1_GROUP != 0) try writer.writeAll(" GROUP");
if (value & elf.DF_1_NODELETE != 0) try writer.writeAll(" NODELETE");
if (value & elf.DF_1_LOADFLTR != 0) try writer.writeAll(" LOADFLTR");
if (value & elf.DF_1_INITFIRST != 0) try writer.writeAll(" INITFIRST");
if (value & elf.DF_1_NOOPEN != 0) try writer.writeAll(" NOOPEN");
if (value & elf.DF_1_ORIGIN != 0) try writer.writeAll(" ORIGIN");
if (value & elf.DF_1_DIRECT != 0) try writer.writeAll(" DIRECT");
if (value & elf.DF_1_TRANS != 0) try writer.writeAll(" TRANS");
if (value & elf.DF_1_INTERPOSE != 0) try writer.writeAll(" INTERPOSE");
if (value & elf.DF_1_NODEFLIB != 0) try writer.writeAll(" NODEFLIB");
if (value & elf.DF_1_NODUMP != 0) try writer.writeAll(" NODUMP");
if (value & elf.DF_1_CONFALT != 0) try writer.writeAll(" CONFALT");
if (value & elf.DF_1_ENDFILTEE != 0) try writer.writeAll(" ENDFILTEE");
if (value & elf.DF_1_DISPRELDNE != 0) try writer.writeAll(" DISPRELDNE");
if (value & elf.DF_1_DISPRELPND != 0) try writer.writeAll(" DISPRELPND");
if (value & elf.DF_1_NODIRECT != 0) try writer.writeAll(" NODIRECT");
if (value & elf.DF_1_IGNMULDEF != 0) try writer.writeAll(" IGNMULDEF");
if (value & elf.DF_1_NOKSYMS != 0) try writer.writeAll(" NOKSYMS");
if (value & elf.DF_1_NOHDR != 0) try writer.writeAll(" NOHDR");
if (value & elf.DF_1_EDITED != 0) try writer.writeAll(" EDITED");
if (value & elf.DF_1_NORELOC != 0) try writer.writeAll(" NORELOC");
if (value & elf.DF_1_SYMINTPOSE != 0) try writer.writeAll(" SYMINTPOSE");
if (value & elf.DF_1_GLOBAUDIT != 0) try writer.writeAll(" GLOBAUDIT");
if (value & elf.DF_1_SINGLETON != 0) try writer.writeAll(" SINGLETON");
if (value & elf.DF_1_STUB != 0) try writer.writeAll(" STUB");
if (value & elf.DF_1_PIE != 0) try writer.writeAll(" PIE");
},
else => try writer.print(" {x}", .{value}),
}
try writer.writeByte('\n');
}
}
fn fmtShType(sh_type: u32) std.fmt.Formatter(formatShType) {
return .{ .data = sh_type };
}
@ -1206,45 +1506,6 @@ const ElfDumper = struct {
try writer.writeAll(name);
}
fn dumpPhdrs(ctx: Context, writer: anytype) !void {
if (ctx.phdrs.len == 0) return;
try writer.writeAll("program headers\n");
for (ctx.phdrs, 0..) |phdr, phndx| {
try writer.print("phdr {d}\n", .{phndx});
try writer.print("type {s}\n", .{fmtPhType(phdr.p_type)});
try writer.print("vaddr {x}\n", .{phdr.p_vaddr});
try writer.print("paddr {x}\n", .{phdr.p_paddr});
try writer.print("offset {x}\n", .{phdr.p_offset});
try writer.print("memsz {x}\n", .{phdr.p_memsz});
try writer.print("filesz {x}\n", .{phdr.p_filesz});
try writer.print("align {x}\n", .{phdr.p_align});
{
const flags = phdr.p_flags;
try writer.writeAll("flags");
if (flags > 0) try writer.writeByte(' ');
if (flags & elf.PF_R != 0) {
try writer.writeByte('R');
}
if (flags & elf.PF_W != 0) {
try writer.writeByte('W');
}
if (flags & elf.PF_X != 0) {
try writer.writeByte('E');
}
if (flags & elf.PF_MASKOS != 0) {
try writer.writeAll("OS");
}
if (flags & elf.PF_MASKPROC != 0) {
try writer.writeAll("PROC");
}
try writer.writeByte('\n');
}
}
}
fn fmtPhType(ph_type: u32) std.fmt.Formatter(formatPhType) {
return .{ .data = ph_type };
}
@ -1278,88 +1539,6 @@ const ElfDumper = struct {
};
try writer.writeAll(p_type);
}
fn dumpSymtab(ctx: Context, comptime @"type": enum { symtab, dysymtab }, writer: anytype) !void {
const symtab = switch (@"type") {
.symtab => ctx.symtab,
.dysymtab => ctx.dysymtab,
} orelse return;
try writer.writeAll(switch (@"type") {
.symtab => symtab_label,
.dysymtab => dynamic_symtab_label,
} ++ "\n");
for (symtab.symbols, 0..) |sym, index| {
try writer.print("{x} {x}", .{ sym.st_value, sym.st_size });
{
if (elf.SHN_LORESERVE <= sym.st_shndx and sym.st_shndx < elf.SHN_HIRESERVE) {
if (elf.SHN_LOPROC <= sym.st_shndx and sym.st_shndx < elf.SHN_HIPROC) {
try writer.print(" LO+{d}", .{sym.st_shndx - elf.SHN_LOPROC});
} else {
const sym_ndx = &switch (sym.st_shndx) {
elf.SHN_ABS => "ABS",
elf.SHN_COMMON => "COM",
elf.SHN_LIVEPATCH => "LIV",
else => "UNK",
};
try writer.print(" {s}", .{sym_ndx});
}
} else if (sym.st_shndx == elf.SHN_UNDEF) {
try writer.writeAll(" UND");
} else {
try writer.print(" {x}", .{sym.st_shndx});
}
}
blk: {
const tt = sym.st_type();
const sym_type = switch (tt) {
elf.STT_NOTYPE => "NOTYPE",
elf.STT_OBJECT => "OBJECT",
elf.STT_FUNC => "FUNC",
elf.STT_SECTION => "SECTION",
elf.STT_FILE => "FILE",
elf.STT_COMMON => "COMMON",
elf.STT_TLS => "TLS",
elf.STT_NUM => "NUM",
elf.STT_GNU_IFUNC => "IFUNC",
else => if (elf.STT_LOPROC <= tt and tt < elf.STT_HIPROC) {
break :blk try writer.print(" LOPROC+{d}", .{tt - elf.STT_LOPROC});
} else if (elf.STT_LOOS <= tt and tt < elf.STT_HIOS) {
break :blk try writer.print(" LOOS+{d}", .{tt - elf.STT_LOOS});
} else "UNK",
};
try writer.print(" {s}", .{sym_type});
}
blk: {
const bind = sym.st_bind();
const sym_bind = switch (bind) {
elf.STB_LOCAL => "LOCAL",
elf.STB_GLOBAL => "GLOBAL",
elf.STB_WEAK => "WEAK",
elf.STB_NUM => "NUM",
else => if (elf.STB_LOPROC <= bind and bind < elf.STB_HIPROC) {
break :blk try writer.print(" LOPROC+{d}", .{bind - elf.STB_LOPROC});
} else if (elf.STB_LOOS <= bind and bind < elf.STB_HIOS) {
break :blk try writer.print(" LOOS+{d}", .{bind - elf.STB_LOOS});
} else "UNKNOWN",
};
try writer.print(" {s}", .{sym_bind});
}
const sym_vis = @as(elf.STV, @enumFromInt(sym.st_other));
try writer.print(" {s}", .{@tagName(sym_vis)});
const sym_name = switch (sym.st_type()) {
elf.STT_SECTION => getSectionName(ctx, sym.st_shndx),
else => symtab.getName(index).?,
};
try writer.print(" {s}\n", .{sym_name});
}
}
};
const WasmDumper = struct {

89
lib/std/elf.zig
View File

@ -1896,3 +1896,92 @@ pub const STV = enum(u2) {
HIDDEN = 2,
PROTECTED = 3,
};
pub const ar_hdr = extern struct {
/// Member file name, sometimes / terminated.
ar_name: [16]u8,
/// File date, decimal seconds since Epoch.
ar_date: [12]u8,
/// User ID, in ASCII format.
ar_uid: [6]u8,
/// Group ID, in ASCII format.
ar_gid: [6]u8,
/// File mode, in ASCII octal.
ar_mode: [8]u8,
/// File size, in ASCII decimal.
ar_size: [10]u8,
/// Always contains ARFMAG.
ar_fmag: [2]u8,
pub fn date(self: ar_hdr) std.fmt.ParseIntError!u64 {
const value = mem.trimRight(u8, &self.ar_date, &[_]u8{0x20});
return std.fmt.parseInt(u64, value, 10);
}
pub fn size(self: ar_hdr) std.fmt.ParseIntError!u32 {
const value = mem.trimRight(u8, &self.ar_size, &[_]u8{0x20});
return std.fmt.parseInt(u32, value, 10);
}
pub fn isStrtab(self: ar_hdr) bool {
return mem.eql(u8, &self.ar_name, STRNAME);
}
pub fn isSymtab(self: ar_hdr) bool {
return mem.eql(u8, &self.ar_name, SYMNAME);
}
pub fn isSymtab64(self: ar_hdr) bool {
return mem.eql(u8, &self.ar_name, SYM64NAME);
}
pub fn isSymdef(self: ar_hdr) bool {
return mem.eql(u8, &self.ar_name, SYMDEFNAME);
}
pub fn isSymdefSorted(self: ar_hdr) bool {
return mem.eql(u8, &self.ar_name, SYMDEFSORTEDNAME);
}
pub fn name(self: *const ar_hdr) ?[]const u8 {
const value = &self.ar_name;
if (value[0] == '/') return null;
const sentinel = mem.indexOfScalar(u8, value, '/') orelse value.len;
return value[0..sentinel];
}
pub fn nameOffset(self: ar_hdr) std.fmt.ParseIntError!?u32 {
const value = &self.ar_name;
if (value[0] != '/') return null;
const trimmed = mem.trimRight(u8, value, &[_]u8{0x20});
return try std.fmt.parseInt(u32, trimmed[1..], 10);
}
};
fn genSpecialMemberName(comptime name: []const u8) *const [16]u8 {
assert(name.len <= 16);
const padding = 16 - name.len;
return name ++ &[_]u8{0x20} ** padding;
}
// Archive files start with the ARMAG identifying string. Then follows a
// `struct ar_hdr', and as many bytes of member file data as its `ar_size'
// member indicates, for each member file.
/// String that begins an archive file.
pub const ARMAG = "!<arch>\n";
/// String in ar_fmag at the end of each header.
pub const ARFMAG = "`\n";
/// 32-bit symtab identifier
pub const SYMNAME = genSpecialMemberName("/");
/// Strtab identifier
pub const STRNAME = genSpecialMemberName("//");
/// 64-bit symtab identifier
pub const SYM64NAME = genSpecialMemberName("/SYM64/");
pub const SYMDEFNAME = genSpecialMemberName("__.SYMDEF");
pub const SYMDEFSORTEDNAME = genSpecialMemberName("__.SYMDEF SORTED");

10
src/Compilation.zig
View File

@ -2304,10 +2304,16 @@ pub fn update(comp: *Compilation, main_progress_node: *std.Progress.Node) !void
defer comp.gpa.free(o_sub_path);
// Work around windows `AccessDenied` if any files within this directory are open
// by doing the makeExecutable/makeWritable dance.
// by closing and reopening the file handles.
const need_writable_dance = builtin.os.tag == .windows and comp.bin_file.file != null;
if (need_writable_dance) {
try comp.bin_file.makeExecutable();
// We cannot just call `makeExecutable` as it makes a false assumption that we have a
// file handle open only when linking an executable file. This used to be true when
// our linkers were incapable of emitting relocatables and static archive. Now that
// they are capable, we need to unconditionally close the file handle and re-open it
// in the follow up call to `makeWritable`.
comp.bin_file.file.?.close();
comp.bin_file.file = null;
}
try comp.bin_file.renameTmpIntoCache(comp.local_cache_directory, tmp_dir_sub_path, o_sub_path);

158
src/link/Elf.zig
View File

@ -288,7 +288,9 @@ pub fn openPath(allocator: Allocator, sub_path: []const u8, options: link.Option
const index = @as(File.Index, @intCast(try self.files.addOne(allocator)));
self.files.set(index, .{ .zig_object = .{
.index = index,
.path = options.module.?.main_mod.root_src_path,
.path = try std.fmt.allocPrint(self.base.allocator, "{s}.o", .{std.fs.path.stem(
options.module.?.main_mod.root_src_path,
)}),
} });
self.zig_object_index = index;
try self.zigObjectPtr().?.init(self);
@ -940,14 +942,8 @@ pub fn flushModule(self: *Elf, comp: *Compilation, prog_node: *std.Progress.Node
} else null;
const gc_sections = self.base.options.gc_sections orelse false;
if (self.isRelocatable() and self.zig_object_index == null) {
if (self.isStaticLib()) {
var err = try self.addErrorWithNotes(0);
try err.addMsg(self, "fatal linker error: emitting static libs unimplemented", .{});
return;
}
if (self.isObject() and self.zig_object_index == null) {
// TODO this will become -r route I guess. For now, just copy the object file.
assert(self.base.file == null); // TODO uncomment once we implement -r
const the_object_path = blk: {
if (self.base.options.objects.len != 0) {
break :blk self.base.options.objects[0].path;
@ -1287,8 +1283,6 @@ pub fn flushModule(self: *Elf, comp: *Compilation, prog_node: *std.Progress.Node
try positionals.append(.{ .path = ssp.full_object_path });
}
if (self.isStaticLib()) return self.flushStaticLib(comp, positionals.items);
for (positionals.items) |obj| {
var parse_ctx: ParseErrorCtx = .{ .detected_cpu_arch = undefined };
self.parsePositional(obj.path, obj.must_link, &parse_ctx) catch |err|
@ -1394,6 +1388,16 @@ pub fn flushModule(self: *Elf, comp: *Compilation, prog_node: *std.Progress.Node
try self.handleAndReportParseError(obj.path, err, &parse_ctx);
}
if (self.isStaticLib()) return self.flushStaticLib(comp);
// Init all objects
for (self.objects.items) |index| {
try self.file(index).?.object.init(self);
}
for (self.shared_objects.items) |index| {
try self.file(index).?.shared_object.init(self);
}
// Dedup shared objects
{
var seen_dsos = std.StringHashMap(void).init(gpa);
@ -1523,18 +1527,8 @@ pub fn flushModule(self: *Elf, comp: *Compilation, prog_node: *std.Progress.Node
}
}
pub fn flushStaticLib(
self: *Elf,
comp: *Compilation,
positionals: []const Compilation.LinkObject,
) link.File.FlushError!void {
pub fn flushStaticLib(self: *Elf, comp: *Compilation) link.File.FlushError!void {
_ = comp;
if (positionals.len > 0) {
var err = try self.addErrorWithNotes(1);
try err.addMsg(self, "fatal linker error: too many input positionals", .{});
try err.addNote(self, "TODO implement linking objects into an static library", .{});
return;
}
const gpa = self.base.allocator;
// First, we flush relocatable object file generated with our backends.
@ -1546,27 +1540,33 @@ pub fn flushStaticLib(
try self.initShStrtab();
try self.sortShdrs();
zig_object.updateRelaSectionSizes(self);
try self.updateSymtabSize();
self.updateSymtabSizeObject(zig_object);
self.updateShStrtabSize();
try self.allocateNonAllocSections();
try self.writeShdrTable();
try zig_object.writeRelaSections(self);
try self.writeSymtab();
try self.writeSymtabObject(zig_object);
try self.writeShStrtab();
try self.writeElfHeader();
}
// TODO parse positionals that we want to make part of the archive
// TODO update ar symtab from parsed positionals
var files = std.ArrayList(File.Index).init(gpa);
defer files.deinit();
try files.ensureTotalCapacityPrecise(self.objects.items.len + 1);
// Note to self: we currently must have ZigObject written out first as we write the object
// file into the same file descriptor and then re-read its contents.
// TODO implement writing ZigObject to a buffer instead of file.
if (self.zigObjectPtr()) |zig_object| files.appendAssumeCapacity(zig_object.index);
for (self.objects.items) |index| files.appendAssumeCapacity(index);
// Update ar symtab from parsed objects
var ar_symtab: Archive.ArSymtab = .{};
defer ar_symtab.deinit(gpa);
if (self.zigObjectPtr()) |zig_object| {
try zig_object.updateArSymtab(&ar_symtab, self);
for (files.items) |index| {
try self.file(index).?.updateArSymtab(&ar_symtab, self);
}
ar_symtab.sort();
@ -1575,25 +1575,32 @@ pub fn flushStaticLib(
var ar_strtab: Archive.ArStrtab = .{};
defer ar_strtab.deinit(gpa);
if (self.zigObjectPtr()) |zig_object| {
try zig_object.updateArStrtab(gpa, &ar_strtab);
zig_object.updateArSize(self);
for (files.items) |index| {
const file_ptr = self.file(index).?;
try file_ptr.updateArStrtab(gpa, &ar_strtab);
file_ptr.updateArSize(self);
}
// Update file offsets of contributing objects.
const total_size: usize = blk: {
var pos: usize = Archive.SARMAG;
pos += @sizeOf(Archive.ar_hdr) + ar_symtab.size(.p64);
var pos: usize = elf.ARMAG.len;
pos += @sizeOf(elf.ar_hdr) + ar_symtab.size(.p64);
if (ar_strtab.size() > 0) {
pos = mem.alignForward(usize, pos, 2);
pos += @sizeOf(Archive.ar_hdr) + ar_strtab.size();
pos += @sizeOf(elf.ar_hdr) + ar_strtab.size();
}
if (self.zigObjectPtr()) |zig_object| {
for (files.items) |index| {
const file_ptr = self.file(index).?;
const state = switch (file_ptr) {
.zig_object => |x| &x.output_ar_state,
.object => |x| &x.output_ar_state,
else => unreachable,
};
pos = mem.alignForward(usize, pos, 2);
zig_object.output_ar_state.file_off = pos;
pos += @sizeOf(Archive.ar_hdr) + (math.cast(usize, zig_object.output_ar_state.size) orelse return error.Overflow);
state.file_off = pos;
pos += @sizeOf(elf.ar_hdr) + (math.cast(usize, state.size) orelse return error.Overflow);
}
break :blk pos;
@ -1609,7 +1616,7 @@ pub fn flushStaticLib(
try buffer.ensureTotalCapacityPrecise(total_size);
// Write magic
try buffer.writer().writeAll(Archive.ARMAG);
try buffer.writer().writeAll(elf.ARMAG);
// Write symtab
try ar_symtab.write(.p64, self, buffer.writer());
@ -1621,9 +1628,9 @@ pub fn flushStaticLib(
}
// Write object files
if (self.zigObjectPtr()) |zig_object| {
for (files.items) |index| {
if (!mem.isAligned(buffer.items.len, 2)) try buffer.writer().writeByte(0);
try zig_object.writeAr(self, buffer.writer());
try self.file(index).?.writeAr(self, buffer.writer());
}
assert(buffer.items.len == total_size);
@ -4054,7 +4061,7 @@ fn updateSectionSizes(self: *Elf) !void {
self.shdrs.items[index].sh_size = self.verneed.size();
}
try self.updateSymtabSize();
self.updateSymtabSize();
self.updateShStrtabSize();
}
@ -4477,7 +4484,7 @@ fn writeAtoms(self: *Elf) !void {
try self.reportUndefined(&undefs);
}
fn updateSymtabSize(self: *Elf) !void {
fn updateSymtabSize(self: *Elf) void {
var sizes = SymtabSize{};
if (self.zigObjectPtr()) |zig_object| {
@ -4538,6 +4545,25 @@ fn updateSymtabSize(self: *Elf) !void {
strtab.sh_size = sizes.strsize + 1;
}
fn updateSymtabSizeObject(self: *Elf, zig_object: *ZigObject) void {
zig_object.asFile().updateSymtabSize(self);
const sizes = zig_object.output_symtab_size;
const symtab_shdr = &self.shdrs.items[self.symtab_section_index.?];
symtab_shdr.sh_info = sizes.nlocals + 1;
symtab_shdr.sh_link = self.strtab_section_index.?;
const sym_size: u64 = switch (self.ptr_width) {
.p32 => @sizeOf(elf.Elf32_Sym),
.p64 => @sizeOf(elf.Elf64_Sym),
};
const needed_size = (sizes.nlocals + sizes.nglobals + 1) * sym_size;
symtab_shdr.sh_size = needed_size;
const strtab = &self.shdrs.items[self.strtab_section_index.?];
strtab.sh_size = sizes.strsize + 1;
}
fn writeSyntheticSections(self: *Elf) !void {
const gpa = self.base.allocator;
@ -4782,6 +4808,54 @@ fn writeSymtab(self: *Elf) !void {
try self.base.file.?.pwriteAll(self.strtab.items, strtab_shdr.sh_offset);
}
fn writeSymtabObject(self: *Elf, zig_object: *ZigObject) !void {
const gpa = self.base.allocator;
const symtab_shdr = self.shdrs.items[self.symtab_section_index.?];
const strtab_shdr = self.shdrs.items[self.strtab_section_index.?];
const sym_size: u64 = switch (self.ptr_width) {
.p32 => @sizeOf(elf.Elf32_Sym),
.p64 => @sizeOf(elf.Elf64_Sym),
};
const nsyms = math.cast(usize, @divExact(symtab_shdr.sh_size, sym_size)) orelse return error.Overflow;
log.debug("writing {d} symbols at 0x{x}", .{ nsyms, symtab_shdr.sh_offset });
try self.symtab.resize(gpa, nsyms);
const needed_strtab_size = math.cast(usize, strtab_shdr.sh_size - 1) orelse return error.Overflow;
try self.strtab.ensureUnusedCapacity(gpa, needed_strtab_size);
zig_object.asFile().writeSymtab(self, .{ .ilocal = 1, .iglobal = symtab_shdr.sh_info });
const foreign_endian = self.base.options.target.cpu.arch.endian() != builtin.cpu.arch.endian();
switch (self.ptr_width) {
.p32 => {
const buf = try gpa.alloc(elf.Elf32_Sym, self.symtab.items.len);
defer gpa.free(buf);
for (buf, self.symtab.items) |*out, sym| {
out.* = .{
.st_name = sym.st_name,
.st_info = sym.st_info,
.st_other = sym.st_other,
.st_shndx = sym.st_shndx,
.st_value = @as(u32, @intCast(sym.st_value)),
.st_size = @as(u32, @intCast(sym.st_size)),
};
if (foreign_endian) mem.byteSwapAllFields(elf.Elf32_Sym, out);
}
try self.base.file.?.pwriteAll(mem.sliceAsBytes(buf), symtab_shdr.sh_offset);
},
.p64 => {
if (foreign_endian) {
for (self.symtab.items) |*sym| mem.byteSwapAllFields(elf.Elf64_Sym, sym);
}
try self.base.file.?.pwriteAll(mem.sliceAsBytes(self.symtab.items), symtab_shdr.sh_offset);
},
}
try self.base.file.?.pwriteAll(self.strtab.items, strtab_shdr.sh_offset);
}
/// Always 4 or 8 depending on whether this is 32-bit ELF or 64-bit ELF.
fn ptrWidthBytes(self: Elf) u8 {
return switch (self.ptr_width) {

121
src/link/Elf/Archive.zig
View File

@ -8,8 +8,8 @@ pub fn isArchive(path: []const u8) !bool {
const file = try std.fs.cwd().openFile(path, .{});
defer file.close();
const reader = file.reader();
const magic = reader.readBytesNoEof(SARMAG) catch return false;
if (!mem.eql(u8, &magic, ARMAG)) return false;
const magic = reader.readBytesNoEof(elf.ARMAG.len) catch return false;
if (!mem.eql(u8, &magic, elf.ARMAG)) return false;
return true;
}
@ -24,21 +24,19 @@ pub fn parse(self: *Archive, elf_file: *Elf) !void {
var stream = std.io.fixedBufferStream(self.data);
const reader = stream.reader();
_ = try reader.readBytesNoEof(SARMAG);
_ = try reader.readBytesNoEof(elf.ARMAG.len);
while (true) {
if (stream.pos >= self.data.len) break;
if (!mem.isAligned(stream.pos, 2)) stream.pos += 1;
if (stream.pos % 2 != 0) {
stream.pos += 1;
}
const hdr = try reader.readStruct(ar_hdr);
const hdr = try reader.readStruct(elf.ar_hdr);
if (!mem.eql(u8, &hdr.ar_fmag, ARFMAG)) {
if (!mem.eql(u8, &hdr.ar_fmag, elf.ARFMAG)) {
// TODO convert into an error
log.debug(
"{s}: invalid header delimiter: expected '{s}', found '{s}'",
.{ self.path, std.fmt.fmtSliceEscapeLower(ARFMAG), std.fmt.fmtSliceEscapeLower(&hdr.ar_fmag) },
.{ self.path, std.fmt.fmtSliceEscapeLower(elf.ARFMAG), std.fmt.fmtSliceEscapeLower(&hdr.ar_fmag) },
);
return;
}
@ -48,28 +46,23 @@ pub fn parse(self: *Archive, elf_file: *Elf) !void {
_ = stream.seekBy(size) catch {};
}
if (hdr.isSymtab()) continue;
if (hdr.isSymtab() or hdr.isSymtab64()) continue;
if (hdr.isStrtab()) {
self.strtab = self.data[stream.pos..][0..size];
continue;
}
if (hdr.isSymdef() or hdr.isSymdefSorted()) continue;
const name = ar_hdr.getValue(&hdr.ar_name);
if (mem.eql(u8, name, "__.SYMDEF") or mem.eql(u8, name, "__.SYMDEF SORTED")) continue;
const object_name = blk: {
if (name[0] == '/') {
const off = try std.fmt.parseInt(u32, name[1..], 10);
const object_name = self.getString(off);
break :blk try gpa.dupe(u8, object_name[0 .. object_name.len - 1]); // To account for trailing '/'
}
break :blk try gpa.dupe(u8, name);
};
const name = if (hdr.name()) |name|
try gpa.dupe(u8, name)
else if (try hdr.nameOffset()) |off|
try gpa.dupe(u8, self.getString(off))
else
unreachable;
const object = Object{
.archive = try gpa.dupe(u8, self.path),
.path = object_name,
.path = name,
.data = try gpa.dupe(u8, self.data[stream.pos..][0..size]),
.index = undefined,
.alive = false,
@ -83,7 +76,8 @@ pub fn parse(self: *Archive, elf_file: *Elf) !void {
fn getString(self: Archive, off: u32) []const u8 {
assert(off < self.strtab.len);
return mem.sliceTo(@as([*:strtab_delimiter]const u8, @ptrCast(self.strtab.ptr + off)), 0);
const name = mem.sliceTo(@as([*:'\n']const u8, @ptrCast(self.strtab.ptr + off)), 0);
return name[0 .. name.len - 1];
}
pub fn setArHdr(opts: struct {
@ -94,8 +88,8 @@ pub fn setArHdr(opts: struct {
name_off: u32,
},
size: u32,
}) ar_hdr {
var hdr: ar_hdr = .{
}) elf.ar_hdr {
var hdr: elf.ar_hdr = .{
.ar_name = undefined,
.ar_date = undefined,
.ar_uid = undefined,
@ -105,15 +99,15 @@ pub fn setArHdr(opts: struct {
.ar_fmag = undefined,
};
@memset(mem.asBytes(&hdr), 0x20);
@memcpy(&hdr.ar_fmag, Archive.ARFMAG);
@memcpy(&hdr.ar_fmag, elf.ARFMAG);
{
var stream = std.io.fixedBufferStream(&hdr.ar_name);
const writer = stream.writer();
switch (opts.name) {
.symtab => writer.print("{s}", .{Archive.SYM64NAME}) catch unreachable,
.symtab => writer.print("{s}", .{elf.SYM64NAME}) catch unreachable,
.strtab => writer.print("//", .{}) catch unreachable,
.name => |x| writer.print("{s}", .{x}) catch unreachable,
.name => |x| writer.print("{s}/", .{x}) catch unreachable,
.name_off => |x| writer.print("/{d}", .{x}) catch unreachable,
}
}
@ -125,72 +119,8 @@ pub fn setArHdr(opts: struct {
return hdr;
}
// Archive files start with the ARMAG identifying string. Then follows a
// `struct ar_hdr', and as many bytes of member file data as its `ar_size'
// member indicates, for each member file.
/// String that begins an archive file.
pub const ARMAG: *const [SARMAG:0]u8 = "!<arch>\n";
/// Size of that string.
pub const SARMAG = 8;
/// String in ar_fmag at the end of each header.
const ARFMAG: *const [2:0]u8 = "`\n";
/// Strtab identifier
const STRNAME: *const [2:0]u8 = "//";
/// 32-bit symtab identifier
const SYMNAME: *const [1:0]u8 = "/";
/// 64-bit symtab identifier
const SYM64NAME: *const [7:0]u8 = "/SYM64/";
const strtab_delimiter = '\n';
pub const ar_hdr = extern struct {
/// Member file name, sometimes / terminated.
ar_name: [16]u8,
/// File date, decimal seconds since Epoch.
ar_date: [12]u8,
/// User ID, in ASCII format.
ar_uid: [6]u8,
/// Group ID, in ASCII format.
ar_gid: [6]u8,
/// File mode, in ASCII octal.
ar_mode: [8]u8,
/// File size, in ASCII decimal.
ar_size: [10]u8,
/// Always contains ARFMAG.
ar_fmag: [2]u8,
fn date(self: ar_hdr) !u64 {
const value = getValue(&self.ar_date);
return std.fmt.parseInt(u64, value, 10);
}
fn size(self: ar_hdr) !u32 {
const value = getValue(&self.ar_size);
return std.fmt.parseInt(u32, value, 10);
}
fn getValue(raw: []const u8) []const u8 {
return mem.trimRight(u8, raw, &[_]u8{@as(u8, 0x20)});
}
fn isStrtab(self: ar_hdr) bool {
return mem.eql(u8, getValue(&self.ar_name), STRNAME);
}
fn isSymtab(self: ar_hdr) bool {
return mem.eql(u8, getValue(&self.ar_name), SYMNAME) or mem.eql(u8, getValue(&self.ar_name), SYM64NAME);
}
};
pub const max_member_name_len = 15;
pub const ArSymtab = struct {
symtab: std.ArrayListUnmanaged(Entry) = .{},
@ -230,6 +160,9 @@ pub const ArSymtab = struct {
if (elf_file.zigObjectPtr()) |zig_object| {
offsets.putAssumeCapacityNoClobber(zig_object.index, zig_object.output_ar_state.file_off);
}
for (elf_file.objects.items) |index| {
offsets.putAssumeCapacityNoClobber(index, elf_file.file(index).?.object.output_ar_state.file_off);
}
// Number of symbols
try writer.writeInt(u64, @as(u64, @intCast(ar.symtab.items.len)), .big);

34
src/link/Elf/Object.zig
View File

@ -20,6 +20,7 @@ alive: bool = true,
num_dynrelocs: u32 = 0,
output_symtab_size: Elf.SymtabSize = .{},
output_ar_state: Archive.ArState = .{},
pub fn isObject(path: []const u8) !bool {
const file = try std.fs.cwd().openFile(path, .{});
@ -96,7 +97,9 @@ pub fn parse(self: *Object, elf_file: *Elf) !void {
sym.st_name + strtab_bias;
}
}
}
pub fn init(self: *Object, elf_file: *Elf) !void {
try self.initAtoms(elf_file);
try self.initSymtab(elf_file);
@ -651,6 +654,36 @@ pub fn allocateAtoms(self: Object, elf_file: *Elf) void {
}
}
pub fn updateArSymtab(self: Object, ar_symtab: *Archive.ArSymtab, elf_file: *Elf) !void {
const gpa = elf_file.base.allocator;
const start = self.first_global orelse self.symtab.items.len;
try ar_symtab.symtab.ensureUnusedCapacity(gpa, self.symtab.items.len - start);
for (self.symtab.items[start..]) |sym| {
if (sym.st_shndx == elf.SHN_UNDEF) continue;
const off = try ar_symtab.strtab.insert(gpa, self.getString(sym.st_name));
ar_symtab.symtab.appendAssumeCapacity(.{ .off = off, .file_index = self.index });
}
}
pub fn updateArSize(self: *Object) void {
self.output_ar_state.size = self.data.len;
}
pub fn writeAr(self: Object, writer: anytype) !void {
const name = self.path;
const hdr = Archive.setArHdr(.{
.name = if (name.len <= Archive.max_member_name_len)
.{ .name = name }
else
.{ .name_off = self.output_ar_state.name_off },
.size = @intCast(self.data.len),
});
try writer.writeAll(mem.asBytes(&hdr));
try writer.writeAll(self.data);
}
pub fn locals(self: Object) []const Symbol.Index {
const end = self.first_global orelse self.symbols.items.len;
return self.symbols.items[0..end];
@ -922,6 +955,7 @@ const math = std.math;
const mem = std.mem;
const Allocator = mem.Allocator;
const Archive = @import("Archive.zig");
const Atom = @import("Atom.zig");
const Cie = eh_frame.Cie;
const Elf = @import("../Elf.zig");

3
src/link/Elf/SharedObject.zig
View File

@ -72,7 +72,6 @@ pub fn parse(self: *SharedObject, elf_file: *Elf) !void {
}
try self.parseVersions(elf_file);
try self.initSymtab(elf_file);
}
fn parseVersions(self: *SharedObject, elf_file: *Elf) !void {
@ -120,7 +119,7 @@ fn parseVersions(self: *SharedObject, elf_file: *Elf) !void {
}
}
fn initSymtab(self: *SharedObject, elf_file: *Elf) !void {
pub fn init(self: *SharedObject, elf_file: *Elf) !void {
const gpa = elf_file.base.allocator;
const symtab = self.getSymtabRaw();
const strtab = self.getStrtabRaw();

27
src/link/Elf/ZigObject.zig
View File

@ -3,7 +3,6 @@
//! and any relocations that may have been emitted.
//! Think about this as fake in-memory Object file for the Zig module.
/// Path is owned by Module and lives as long as *Module.
path: []const u8,
index: File.Index,
@ -78,7 +77,7 @@ pub fn init(self: *ZigObject, elf_file: *Elf) !void {
try self.atoms.append(gpa, 0); // null input section
try self.strtab.buffer.append(gpa, 0);
const name_off = try self.strtab.insert(gpa, std.fs.path.stem(self.path));
const name_off = try self.strtab.insert(gpa, self.path);
const symbol_index = try elf_file.addSymbol();
try self.local_symbols.append(gpa, symbol_index);
const symbol_ptr = elf_file.symbol(symbol_index);
@ -98,6 +97,7 @@ pub fn init(self: *ZigObject, elf_file: *Elf) !void {
}
pub fn deinit(self: *ZigObject, allocator: Allocator) void {
allocator.free(self.path);
self.local_esyms.deinit(allocator);
self.global_esyms.deinit(allocator);
self.strtab.deinit(allocator);
@ -512,25 +512,13 @@ pub fn updateArSymtab(self: ZigObject, ar_symtab: *Archive.ArSymtab, elf_file: *
const global = elf_file.symbol(global_index);
const file_ptr = global.file(elf_file).?;
assert(file_ptr.index() == self.index);
if (global.type(elf_file) == elf.SHN_UNDEF) continue;
if (global.outputShndx() == null) continue;
const off = try ar_symtab.strtab.insert(gpa, global.name(elf_file));
ar_symtab.symtab.appendAssumeCapacity(.{ .off = off, .file_index = self.index });
}
}
pub fn updateArStrtab(
self: *ZigObject,
allocator: Allocator,
ar_strtab: *Archive.ArStrtab,
) error{OutOfMemory}!void {
const name = try std.fmt.allocPrint(allocator, "{s}.o", .{std.fs.path.stem(self.path)});
defer allocator.free(name);
if (name.len <= 15) return;
const name_off = try ar_strtab.insert(allocator, name);
self.output_ar_state.name_off = name_off;
}
pub fn updateArSize(self: *ZigObject, elf_file: *Elf) void {
var end_pos: u64 = elf_file.shdr_table_offset.?;
for (elf_file.shdrs.items) |shdr| {
@ -549,11 +537,12 @@ pub fn writeAr(self: ZigObject, elf_file: *Elf, writer: anytype) !void {
const amt = try elf_file.base.file.?.preadAll(contents, 0);
if (amt != self.output_ar_state.size) return error.InputOutput;
const name = try std.fmt.allocPrint(gpa, "{s}.o", .{std.fs.path.stem(self.path)});
defer gpa.free(name);
const name = self.path;
const hdr = Archive.setArHdr(.{
.name = if (name.len <= 15) .{ .name = name } else .{ .name_off = self.output_ar_state.name_off },
.name = if (name.len <= Archive.max_member_name_len)
.{ .name = name }
else
.{ .name_off = self.output_ar_state.name_off },
.size = @intCast(size),
});
try writer.writeAll(mem.asBytes(&hdr));

37
src/link/Elf/file.zig
View File

@ -161,7 +161,7 @@ pub const File = union(enum) {
}
pub fn writeSymtab(file: File, elf_file: *Elf, ctx: anytype) void {
var ilocal = ctx.ilocal;
var ilocal: usize = ctx.ilocal;
for (file.locals()) |local_index| {
const local = elf_file.symbol(local_index);
if (!local.flags.output_symtab) continue;
@ -173,7 +173,7 @@ pub const File = union(enum) {
ilocal += 1;
}
var iglobal = ctx.iglobal;
var iglobal: usize = ctx.iglobal;
for (file.globals()) |global_index| {
const global = elf_file.symbol(global_index);
const file_ptr = global.file(elf_file) orelse continue;
@ -199,7 +199,38 @@ pub const File = union(enum) {
pub fn updateArSymtab(file: File, ar_symtab: *Archive.ArSymtab, elf_file: *Elf) !void {
return switch (file) {
.zig_object => |x| x.updateArSymtab(ar_symtab, elf_file),
.object => @panic("TODO"),
.object => |x| x.updateArSymtab(ar_symtab, elf_file),
inline else => unreachable,
};
}
pub fn updateArStrtab(file: File, allocator: Allocator, ar_strtab: *Archive.ArStrtab) !void {
const path = switch (file) {
.zig_object => |x| x.path,
.object => |x| x.path,
inline else => unreachable,
};
const state = switch (file) {
.zig_object => |x| &x.output_ar_state,
.object => |x| &x.output_ar_state,
inline else => unreachable,
};
if (path.len <= Archive.max_member_name_len) return;
state.name_off = try ar_strtab.insert(allocator, path);
}
pub fn updateArSize(file: File, elf_file: *Elf) void {
return switch (file) {
.zig_object => |x| x.updateArSize(elf_file),
.object => |x| x.updateArSize(),
inline else => unreachable,
};
}
pub fn writeAr(file: File, elf_file: *Elf, writer: anytype) !void {
return switch (file) {
.zig_object => |x| x.writeAr(elf_file, writer),
.object => |x| x.writeAr(writer),
inline else => unreachable,
};
}

90
test/link/elf.zig
View File

@ -21,6 +21,9 @@ pub fn build(b: *Build) void {
.abi = .gnu,
};
// Exercise linker in ar mode
elf_step.dependOn(testEmitStaticLib(b, .{ .target = musl_target }));
// Exercise linker with self-hosted backend (no LLVM)
elf_step.dependOn(testGcSectionsZig(b, .{ .use_llvm = false, .target = default_target }));
elf_step.dependOn(testLinkingObj(b, .{ .use_llvm = false, .target = default_target }));
@ -626,6 +629,65 @@ fn testDsoUndef(b: *Build, opts: Options) *Step {
return test_step;
}
fn testEmitStaticLib(b: *Build, opts: Options) *Step {
const test_step = addTestStep(b, "emit-static-lib", opts);
const obj1 = addObject(b, "obj1", opts);
addCSourceBytes(obj1,
\\int foo = 0;
\\int bar = 2;
\\int fooBar() {
\\ return foo + bar;
\\}
, &.{});
const obj2 = addObject(b, "obj2", opts);
addCSourceBytes(obj2, "int tentative;", &.{"-fcommon"});
const obj3 = addObject(b, "a_very_long_file_name_so_that_it_ends_up_in_strtab", opts);
addZigSourceBytes(obj3,
\\fn weakFoo() callconv(.C) usize {
\\ return 42;
\\}
\\export var strongBar: usize = 100;
\\comptime {
\\ @export(weakFoo, .{ .name = "weakFoo", .linkage = .Weak });
\\ @export(strongBar, .{ .name = "strongBarAlias", .linkage = .Strong });
\\}
);
const lib = addStaticLibrary(b, "lib", opts);
lib.addObject(obj1);
lib.addObject(obj2);
lib.addObject(obj3);
const check = lib.checkObject();
check.checkInArchiveSymtab();
check.checkExactPath("in object", obj1.getEmittedBin());
check.checkExact("foo");
check.checkInArchiveSymtab();
check.checkExactPath("in object", obj1.getEmittedBin());
check.checkExact("bar");
check.checkInArchiveSymtab();
check.checkExactPath("in object", obj1.getEmittedBin());
check.checkExact("fooBar");
check.checkInArchiveSymtab();
check.checkExactPath("in object", obj2.getEmittedBin());
check.checkExact("tentative");
check.checkInArchiveSymtab();
check.checkExactPath("in object", obj3.getEmittedBin());
check.checkExact("weakFoo");
check.checkInArchiveSymtab();
check.checkExactPath("in object", obj3.getEmittedBin());
check.checkExact("strongBar");
check.checkInArchiveSymtab();
check.checkExactPath("in object", obj3.getEmittedBin());
check.checkExact("strongBarAlias");
test_step.dependOn(&check.step);
return test_step;
}
fn testEmptyObject(b: *Build, opts: Options) *Step {
const test_step = addTestStep(b, "empty-object", opts);
@ -1858,34 +1920,30 @@ fn testLinkingObj(b: *Build, opts: Options) *Step {
fn testLinkingStaticLib(b: *Build, opts: Options) *Step {
const test_step = addTestStep(b, "linking-static-lib", opts);
const lib = b.addStaticLibrary(.{
.name = "alib",
.target = opts.target,
.optimize = opts.optimize,
.use_llvm = opts.use_llvm,
.use_lld = false,
});
const obj = addObject(b, "bobj", opts);
addZigSourceBytes(obj, "export var bar: i32 = -42;");
const lib = addStaticLibrary(b, "alib", opts);
addZigSourceBytes(lib,
\\extern var mod: usize;
\\export fn callMe() usize {
\\ return me * mod;
\\export fn foo() i32 {
\\ return 42;
\\}
\\var me: usize = 42;
);
lib.addObject(obj);
const exe = addExecutable(b, "testlib", opts);
addZigSourceBytes(exe,
\\const std = @import("std");
\\extern fn callMe() usize;
\\export var mod: usize = 2;
\\extern fn foo() i32;
\\extern var bar: i32;
\\pub fn main() void {
\\ std.debug.print("{d}\n", .{callMe()});
\\ std.debug.print("{d}\n", .{foo() + bar});
\\}
);
exe.linkLibrary(lib);
const run = addRunArtifact(exe);
run.expectStdErrEqual("84\n");
run.expectStdErrEqual("0\n");
test_step.dependOn(&run.step);
return test_step;
@ -3332,7 +3390,7 @@ fn addStaticLibrary(b: *Build, name: []const u8, opts: Options) *Compile {
.target = opts.target,
.optimize = opts.optimize,
.use_llvm = opts.use_llvm,
.use_lld = true,
.use_lld = opts.use_lld,
});
}