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ability to target any glibc version

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This commit is contained in:
Andrew Kelley 2019-07-07 17:06:09 -04:00
parent 3b97940fb3
commit 7ccf7807b3
No known key found for this signature in database
GPG Key ID: 7C5F548F728501A9
14 changed files with 691 additions and 53 deletions
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4
CMakeLists.txt
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@ -421,6 +421,7 @@ set(ZIG_MAIN_SRC "${CMAKE_SOURCE_DIR}/src/main.cpp")
set(ZIG0_SHIM_SRC "${CMAKE_SOURCE_DIR}/src/userland.cpp")
set(ZIG_SOURCES
"${CMAKE_SOURCE_DIR}/src/glibc.cpp"
"${CMAKE_SOURCE_DIR}/src/analyze.cpp"
"${CMAKE_SOURCE_DIR}/src/ast_render.cpp"
"${CMAKE_SOURCE_DIR}/src/bigfloat.cpp"
@ -2667,6 +2668,9 @@ set(ZIG_MUSL_SRC_FILES
)
set(ZIG_LIBC_FILES
"glibc/abi.txt"
"glibc/fns.txt"
"glibc/vers.txt"
"glibc/bits/byteswap.h"
"glibc/bits/endian.h"
"glibc/bits/floatn-common.h"

4
src/all_types.hpp
View File

@ -1921,6 +1921,7 @@ struct CodeGen {
Buf *zig_lib_dir;
Buf *zig_std_dir;
Buf *dynamic_linker_path;
Buf *version_script_path;
const char **llvm_argv;
size_t llvm_argv_len;
@ -3788,6 +3789,9 @@ static const size_t stack_trace_ptr_count = 32;
#define NAMESPACE_SEP_CHAR '.'
#define NAMESPACE_SEP_STR "."
#define CACHE_OUT_SUBDIR "o"
#define CACHE_HASH_SUBDIR "h"
enum FloatMode {
FloatModeStrict,
FloatModeOptimized,

36
src/codegen.cpp
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@ -24,9 +24,6 @@
#include <stdio.h>
#include <errno.h>
#define CACHE_OUT_SUBDIR "o"
#define CACHE_HASH_SUBDIR "h"
static void init_darwin_native(CodeGen *g) {
char *osx_target = getenv("MACOSX_DEPLOYMENT_TARGET");
char *ios_target = getenv("IPHONEOS_DEPLOYMENT_TARGET");
@ -9502,6 +9499,7 @@ static Error check_cache(CodeGen *g, Buf *manifest_dir, Buf *digest) {
cache_buf(ch, &g->libc->kernel32_lib_dir);
}
cache_buf_opt(ch, g->dynamic_linker_path);
cache_buf_opt(ch, g->version_script_path);
// gen_c_objects appends objects to g->link_objects which we want to include in the hash
gen_c_objects(g);
@ -9695,3 +9693,35 @@ ZigPackage *codegen_create_package(CodeGen *g, const char *root_src_dir, const c
}
return pkg;
}
CodeGen *create_child_codegen(CodeGen *parent_gen, Buf *root_src_path, OutType out_type,
ZigLibCInstallation *libc)
{
CodeGen *child_gen = codegen_create(nullptr, root_src_path, parent_gen->zig_target, out_type,
parent_gen->build_mode, parent_gen->zig_lib_dir, parent_gen->zig_std_dir, libc, get_stage1_cache_path());
child_gen->disable_gen_h = true;
child_gen->want_stack_check = WantStackCheckDisabled;
child_gen->verbose_tokenize = parent_gen->verbose_tokenize;
child_gen->verbose_ast = parent_gen->verbose_ast;
child_gen->verbose_link = parent_gen->verbose_link;
child_gen->verbose_ir = parent_gen->verbose_ir;
child_gen->verbose_llvm_ir = parent_gen->verbose_llvm_ir;
child_gen->verbose_cimport = parent_gen->verbose_cimport;
child_gen->verbose_cc = parent_gen->verbose_cc;
child_gen->llvm_argv = parent_gen->llvm_argv;
child_gen->dynamic_linker_path = parent_gen->dynamic_linker_path;
codegen_set_strip(child_gen, parent_gen->strip_debug_symbols);
child_gen->want_pic = parent_gen->have_pic ? WantPICEnabled : WantPICDisabled;
child_gen->valgrind_support = ValgrindSupportDisabled;
codegen_set_errmsg_color(child_gen, parent_gen->err_color);
codegen_set_mmacosx_version_min(child_gen, parent_gen->mmacosx_version_min);
codegen_set_mios_version_min(child_gen, parent_gen->mios_version_min);
child_gen->enable_cache = true;
return child_gen;
}

3
src/codegen.hpp
View File

@ -20,6 +20,9 @@ CodeGen *codegen_create(Buf *main_pkg_path, Buf *root_src_path, const ZigTarget
OutType out_type, BuildMode build_mode, Buf *zig_lib_dir, Buf *override_std_dir,
ZigLibCInstallation *libc, Buf *cache_dir);
CodeGen *create_child_codegen(CodeGen *parent_gen, Buf *root_src_path, OutType out_type,
ZigLibCInstallation *libc);
void codegen_set_clang_argv(CodeGen *codegen, const char **args, size_t len);
void codegen_set_llvm_argv(CodeGen *codegen, const char **args, size_t len);
void codegen_set_is_test(CodeGen *codegen, bool is_test);

26
src/compiler.cpp
View File

@ -9,9 +9,13 @@ static Buf saved_stage1_path = BUF_INIT;
static Buf saved_lib_dir = BUF_INIT;
static Buf saved_special_dir = BUF_INIT;
static Buf saved_std_dir = BUF_INIT;
static Buf saved_dynamic_linker_path = BUF_INIT;
static bool searched_for_dyn_linker = false;
static Buf saved_libc_path = BUF_INIT;
static bool searched_for_libc = false;
Buf *get_stage1_cache_path(void) {
if (saved_stage1_path.list.length != 0) {
return &saved_stage1_path;
@ -36,6 +40,28 @@ static void detect_dynamic_linker(Buf *lib_path) {
#endif
}
const Buf *get_self_libc_path(void) {
for (;;) {
if (saved_libc_path.list.length != 0) {
return &saved_libc_path;
}
if (searched_for_libc)
return nullptr;
ZigList<Buf *> lib_paths = {};
Error err;
if ((err = os_self_exe_shared_libs(lib_paths)))
return nullptr;
for (size_t i = 0; i < lib_paths.length; i += 1) {
Buf *lib_path = lib_paths.at(i);
if (buf_ends_with_str(lib_path, "libc.so.6")) {
buf_init_from_buf(&saved_libc_path, lib_path);
return &saved_libc_path;
}
}
searched_for_libc = true;
}
}
Buf *get_self_dynamic_linker_path(void) {
for (;;) {
if (saved_dynamic_linker_path.list.length != 0) {

1
src/compiler.hpp
View File

@ -14,6 +14,7 @@
Buf *get_stage1_cache_path(void);
Error get_compiler_id(Buf **result);
Buf *get_self_dynamic_linker_path(void);
Buf *get_self_libc_path(void);
Buf *get_zig_lib_dir(void);
Buf *get_zig_special_dir(Buf *zig_lib_dir);

410
src/glibc.cpp Normal file
View File

@ -0,0 +1,410 @@
/*
* Copyright (c) 2019 Andrew Kelley
*
* This file is part of zig, which is MIT licensed.
* See http://opensource.org/licenses/MIT
*/
#include "glibc.hpp"
#include "compiler.hpp"
#include "cache_hash.hpp"
#include "codegen.hpp"
static const ZigGLibCLib glibc_libs[] = {
{"c", 6},
{"m", 6},
{"pthread", 0},
{"dl", 2},
{"rt", 1},
};
Error glibc_load_metadata(ZigGLibCAbi **out_result, Buf *zig_lib_dir, bool verbose) {
Error err;
ZigGLibCAbi *glibc_abi = allocate<ZigGLibCAbi>(1);
glibc_abi->vers_txt_path = buf_sprintf("%s" OS_SEP "libc" OS_SEP "glibc" OS_SEP "vers.txt", buf_ptr(zig_lib_dir));
glibc_abi->fns_txt_path = buf_sprintf("%s" OS_SEP "libc" OS_SEP "glibc" OS_SEP "fns.txt", buf_ptr(zig_lib_dir));
glibc_abi->abi_txt_path = buf_sprintf("%s" OS_SEP "libc" OS_SEP "glibc" OS_SEP "abi.txt", buf_ptr(zig_lib_dir));
glibc_abi->version_table.init(16);
Buf *vers_txt_contents = buf_alloc();
if ((err = os_fetch_file_path(glibc_abi->vers_txt_path, vers_txt_contents))) {
if (verbose) {
fprintf(stderr, "Unable to read %s: %s\n", buf_ptr(glibc_abi->vers_txt_path), err_str(err));
}
return err;
}
Buf *fns_txt_contents = buf_alloc();
if ((err = os_fetch_file_path(glibc_abi->fns_txt_path, fns_txt_contents))) {
if (verbose) {
fprintf(stderr, "Unable to read %s: %s\n", buf_ptr(glibc_abi->fns_txt_path), err_str(err));
}
return err;
}
Buf *abi_txt_contents = buf_alloc();
if ((err = os_fetch_file_path(glibc_abi->abi_txt_path, abi_txt_contents))) {
if (verbose) {
fprintf(stderr, "Unable to read %s: %s\n", buf_ptr(glibc_abi->abi_txt_path), err_str(err));
}
return err;
}
{
SplitIterator it = memSplit(buf_to_slice(vers_txt_contents), str("\n"));
for (;;) {
Optional<Slice<uint8_t>> opt_component = SplitIterator_next(&it);
if (!opt_component.is_some) break;
Buf *ver_buf = buf_create_from_slice(opt_component.value);
ZigGLibCVersion *this_ver = glibc_abi->all_versions.add_one();
if ((err = target_parse_glibc_version(this_ver, buf_ptr(ver_buf)))) {
if (verbose) {
fprintf(stderr, "Unable to parse glibc version '%s': %s\n", buf_ptr(ver_buf), err_str(err));
}
return err;
}
}
}
{
SplitIterator it = memSplit(buf_to_slice(fns_txt_contents), str("\n"));
for (;;) {
Optional<Slice<uint8_t>> opt_component = SplitIterator_next(&it);
if (!opt_component.is_some) break;
SplitIterator line_it = memSplit(opt_component.value, str(" "));
Optional<Slice<uint8_t>> opt_fn_name = SplitIterator_next(&line_it);
if (!opt_fn_name.is_some) {
if (verbose) {
fprintf(stderr, "%s: Expected function name\n", buf_ptr(glibc_abi->fns_txt_path));
}
return ErrorInvalidFormat;
}
Optional<Slice<uint8_t>> opt_lib_name = SplitIterator_next(&line_it);
if (!opt_lib_name.is_some) {
if (verbose) {
fprintf(stderr, "%s: Expected lib name\n", buf_ptr(glibc_abi->fns_txt_path));
}
return ErrorInvalidFormat;
}
Buf *this_fn_name = buf_create_from_slice(opt_fn_name.value);
Buf *this_lib_name = buf_create_from_slice(opt_lib_name.value);
glibc_abi->all_functions.append({ this_fn_name, glibc_lib_find(buf_ptr(this_lib_name)) });
}
}
{
SplitIterator it = memSplit(buf_to_slice(abi_txt_contents), str("\n"));
ZigGLibCVerList *ver_list_base = nullptr;
for (;;) {
if (ver_list_base == nullptr) {
Optional<Slice<uint8_t>> opt_line = SplitIterator_next_separate(&it);
if (!opt_line.is_some) break;
ver_list_base = allocate<ZigGLibCVerList>(glibc_abi->all_functions.length);
ZigTarget *target = allocate<ZigTarget>(1);
SplitIterator line_it = memSplit(opt_line.value, str(" "));
for (;;) {
Optional<Slice<uint8_t>> opt_target = SplitIterator_next(&line_it);
if (!opt_target.is_some) break;
SplitIterator component_it = memSplit(opt_target.value, str("-"));
Optional<Slice<uint8_t>> opt_arch = SplitIterator_next(&component_it);
assert(opt_arch.is_some);
Optional<Slice<uint8_t>> opt_os = SplitIterator_next(&component_it);
assert(opt_os.is_some); // it's always "linux" so we ignore it
Optional<Slice<uint8_t>> opt_abi = SplitIterator_next(&component_it);
assert(opt_abi.is_some);
err = target_parse_archsub(&target->arch, &target->sub_arch,
(char*)opt_arch.value.ptr, opt_arch.value.len);
// there's no sub arch so we might get an error, but the arch is still populated
assert(err == ErrorNone || err == ErrorUnknownArchitecture);
target->os = OsLinux;
err = target_parse_abi(&target->abi, (char*)opt_abi.value.ptr, opt_abi.value.len);
assert(err == ErrorNone);
glibc_abi->version_table.put(target, ver_list_base);
}
continue;
}
for (size_t fn_i = 0; fn_i < glibc_abi->all_functions.length; fn_i += 1) {
ZigGLibCVerList *ver_list = &ver_list_base[fn_i];
Optional<Slice<uint8_t>> opt_line = SplitIterator_next_separate(&it);
assert(opt_line.is_some);
SplitIterator line_it = memSplit(opt_line.value, str(" "));
for (;;) {
Optional<Slice<uint8_t>> opt_ver = SplitIterator_next(&line_it);
if (!opt_ver.is_some) break;
assert(ver_list->len < 8); // increase the array len in the type
unsigned long ver_index = strtoul(buf_ptr(buf_create_from_slice(opt_ver.value)), nullptr, 10);
assert(ver_index < 255); // use a bigger integer in the type
ver_list->versions[ver_list->len] = ver_index;
ver_list->len += 1;
}
}
ver_list_base = nullptr;
}
}
*out_result = glibc_abi;
return ErrorNone;
}
Error glibc_build_dummies_and_maps(CodeGen *g, const ZigGLibCAbi *glibc_abi, const ZigTarget *target,
Buf **out_dir, bool verbose)
{
Error err;
Buf *cache_dir = get_stage1_cache_path();
CacheHash *cache_hash = allocate<CacheHash>(1);
Buf *manifest_dir = buf_sprintf("%s" OS_SEP CACHE_HASH_SUBDIR, buf_ptr(cache_dir));
cache_init(cache_hash, manifest_dir);
Buf *compiler_id;
if ((err = get_compiler_id(&compiler_id))) {
if (verbose) {
fprintf(stderr, "unable to get compiler id: %s\n", err_str(err));
}
return err;
}
cache_buf(cache_hash, compiler_id);
cache_int(cache_hash, target->arch);
cache_int(cache_hash, target->abi);
cache_int(cache_hash, target->glibc_version->major);
cache_int(cache_hash, target->glibc_version->minor);
cache_int(cache_hash, target->glibc_version->patch);
Buf digest = BUF_INIT;
buf_resize(&digest, 0);
if ((err = cache_hit(cache_hash, &digest))) {
// Treat an invalid format error as a cache miss.
if (err != ErrorInvalidFormat)
return err;
}
// We should always get a cache hit because there are no
// files in the input hash.
assert(buf_len(&digest) != 0);
Buf *dummy_dir = buf_alloc();
os_path_join(manifest_dir, &digest, dummy_dir);
if ((err = os_make_path(dummy_dir)))
return err;
Buf *test_if_exists_path = buf_alloc();
os_path_join(dummy_dir, buf_create_from_str("ok"), test_if_exists_path);
bool hit;
if ((err = os_file_exists(test_if_exists_path, &hit)))
return err;
// TODO this is for debugging
fprintf(stderr, "dummy so dir: %s\n", buf_ptr(dummy_dir));
if (hit) {
*out_dir = dummy_dir;
return ErrorNone;
}
ZigGLibCVerList *ver_list_base = glibc_abi->version_table.get(target);
uint8_t target_ver_index = 0;
for (;target_ver_index < glibc_abi->all_versions.length; target_ver_index += 1) {
const ZigGLibCVersion *this_ver = &glibc_abi->all_versions.at(target_ver_index);
if (this_ver->major == target->glibc_version->major &&
this_ver->minor == target->glibc_version->minor &&
this_ver->patch == target->glibc_version->patch)
{
break;
}
}
if (target_ver_index == glibc_abi->all_versions.length) {
if (verbose) {
fprintf(stderr, "Unrecognized glibc version: %d.%d.%d\n",
target->glibc_version->major,
target->glibc_version->minor,
target->glibc_version->patch);
}
return ErrorUnknownABI;
}
Buf *map_file_path = buf_sprintf("%s" OS_SEP "all.map", buf_ptr(dummy_dir));
Buf *map_contents = buf_alloc();
for (uint8_t ver_i = 0; ver_i < glibc_abi->all_versions.length; ver_i += 1) {
const ZigGLibCVersion *ver = &glibc_abi->all_versions.at(ver_i);
if (ver->patch == 0) {
buf_appendf(map_contents, "GLIBC_%d.%d { };\n", ver->major, ver->minor);
} else {
buf_appendf(map_contents, "GLIBC_%d.%d.%d { };\n", ver->major, ver->minor, ver->patch);
}
}
if ((err = os_write_file(map_file_path, map_contents))) {
if (verbose) {
fprintf(stderr, "unable to write %s: %s", buf_ptr(map_file_path), err_str(err));
}
return err;
}
for (size_t lib_i = 0; lib_i < array_length(glibc_libs); lib_i += 1) {
const ZigGLibCLib *lib = &glibc_libs[lib_i];
Buf *zig_file_path = buf_sprintf("%s" OS_SEP "%s.zig", buf_ptr(dummy_dir), lib->name);
Buf *zig_body = buf_alloc();
Buf *zig_footer = buf_alloc();
buf_appendf(zig_body, "comptime {\n");
buf_appendf(zig_body, " asm (\n");
for (size_t fn_i = 0; fn_i < glibc_abi->all_functions.length; fn_i += 1) {
const ZigGLibCFn *libc_fn = &glibc_abi->all_functions.at(fn_i);
if (libc_fn->lib != lib) continue;
ZigGLibCVerList *ver_list = &ver_list_base[fn_i];
// Pick the default symbol version:
// - If there are no versions, don't emit it
// - Take the greatest one <= than the target one
// - If none of them is <= than the
// specified one don't pick any default version
if (ver_list->len == 0) continue;
uint8_t chosen_def_ver_index = 255;
for (uint8_t ver_i = 0; ver_i < ver_list->len; ver_i += 1) {
uint8_t ver_index = ver_list->versions[ver_i];
if ((chosen_def_ver_index == 255 || ver_index > chosen_def_ver_index) &&
target_ver_index >= ver_index)
{
chosen_def_ver_index = ver_index;
}
}
for (uint8_t ver_i = 0; ver_i < ver_list->len; ver_i += 1) {
uint8_t ver_index = ver_list->versions[ver_i];
Buf *stub_name;
const ZigGLibCVersion *ver = &glibc_abi->all_versions.at(ver_index);
const char *sym_name = buf_ptr(libc_fn->name);
if (ver->patch == 0) {
stub_name = buf_sprintf("%s_%d_%d", sym_name, ver->major, ver->minor);
} else {
stub_name = buf_sprintf("%s_%d_%d_%d", sym_name, ver->major, ver->minor, ver->patch);
}
buf_appendf(zig_footer, "export fn %s() void {}\n", buf_ptr(stub_name));
// Default symbol version definition vs normal symbol version definition
const char *at_sign_str = (chosen_def_ver_index != 255 &&
ver_index == chosen_def_ver_index) ? "@@" : "@";
if (ver->patch == 0) {
buf_appendf(zig_body, " \\\\ .symver %s, %s%sGLIBC_%d.%d\n",
buf_ptr(stub_name), sym_name, at_sign_str, ver->major, ver->minor);
} else {
buf_appendf(zig_body, " \\\\ .symver %s, %s%sGLIBC_%d.%d.%d\n",
buf_ptr(stub_name), sym_name, at_sign_str, ver->major, ver->minor, ver->patch);
}
// Hide the stub to keep the symbol table clean
buf_appendf(zig_body, " \\\\ .hidden %s\n", buf_ptr(stub_name));
}
}
buf_appendf(zig_body, " );\n");
buf_appendf(zig_body, "}\n");
buf_append_buf(zig_body, zig_footer);
if ((err = os_write_file(zig_file_path, zig_body))) {
if (verbose) {
fprintf(stderr, "unable to write %s: %s", buf_ptr(zig_file_path), err_str(err));
}
return err;
}
CodeGen *child_gen = create_child_codegen(g, zig_file_path, OutTypeLib, nullptr);
codegen_set_out_name(child_gen, buf_create_from_str(lib->name));
codegen_set_lib_version(child_gen, lib->sover, 0, 0);
child_gen->is_dynamic = true;
child_gen->is_dummy_so = true;
child_gen->version_script_path = map_file_path;
child_gen->enable_cache = false;
child_gen->output_dir = dummy_dir;
codegen_build_and_link(child_gen);
}
if ((err = os_write_file(test_if_exists_path, buf_alloc()))) {
if (verbose) {
fprintf(stderr, "unable to write %s: %s", buf_ptr(test_if_exists_path), err_str(err));
}
return err;
}
*out_dir = dummy_dir;
return ErrorNone;
}
uint32_t hash_glibc_target(const ZigTarget *x) {
return x->arch * 3250106448 +
x->os * 542534372 +
x->abi * 59162639;
}
bool eql_glibc_target(const ZigTarget *a, const ZigTarget *b) {
return a->arch == b->arch &&
a->os == b->os &&
a->abi == b->abi;
}
#ifdef ZIG_OS_LINUX
#include <unistd.h>
#include <linux/limits.h>
Error glibc_detect_native_version(ZigGLibCVersion *glibc_ver) {
Buf *self_libc_path = get_self_libc_path();
if (self_libc_path == nullptr) {
// TODO There is still more we could do to detect the native glibc version. For example,
// we could look at the ELF file of `/usr/bin/env`, find `libc.so.6`, and then `readlink`
// to find out the glibc version. This is relevant for the static zig builds distributed
// on the download page, since the above detection based on zig's own dynamic linking
// will not work.
return ErrorUnknownABI;
}
Buf *link_name = buf_alloc();
buf_resize(link_name, PATH_MAX);
ssize_t amt = readlink(buf_ptr(self_libc_path), buf_ptr(link_name), buf_len(link_name));
if (amt == -1) {
return ErrorUnknownABI;
}
buf_resize(link_name, amt);
if (!buf_starts_with_str(link_name, "libc-") || !buf_ends_with_str(link_name, ".so")) {
return ErrorUnknownABI;
}
// example: "libc-2.3.4.so"
// example: "libc-2.27.so"
buf_resize(link_name, buf_len(link_name) - 3); // chop off ".so"
glibc_ver->major = 2;
glibc_ver->minor = 0;
glibc_ver->patch = 0;
return target_parse_glibc_version(glibc_ver, buf_ptr(link_name) + 5);
}
#else
Error glibc_detect_native_version(ZigGLibCVersion *glibc_ver) {
return ErrorUnknownABI;
}
#endif
size_t glibc_lib_count(void) {
return array_length(glibc_libs);
}
const ZigGLibCLib *glibc_lib_enum(size_t index) {
assert(index < array_length(glibc_libs));
return &glibc_libs[index];
}
const ZigGLibCLib *glibc_lib_find(const char *name) {
for (size_t i = 0; i < array_length(glibc_libs); i += 1) {
if (strcmp(glibc_libs[i].name, name) == 0) {
return &glibc_libs[i];
}
}
return nullptr;
}

53
src/glibc.hpp Normal file
View File

@ -0,0 +1,53 @@
/*
* Copyright (c) 2019 Andrew Kelley
*
* This file is part of zig, which is MIT licensed.
* See http://opensource.org/licenses/MIT
*/
#ifndef ZIG_GLIBC_HPP
#define ZIG_GLIBC_HPP
#include "all_types.hpp"
struct ZigGLibCLib {
const char *name;
uint8_t sover;
};
struct ZigGLibCFn {
Buf *name;
const ZigGLibCLib *lib;
};
struct ZigGLibCVerList {
uint8_t versions[8]; // 8 is just the max number, we know statically it's big enough
uint8_t len;
};
uint32_t hash_glibc_target(const ZigTarget *x);
bool eql_glibc_target(const ZigTarget *a, const ZigTarget *b);
struct ZigGLibCAbi {
Buf *abi_txt_path;
Buf *vers_txt_path;
Buf *fns_txt_path;
ZigList<ZigGLibCVersion> all_versions;
ZigList<ZigGLibCFn> all_functions;
// The value is a pointer to all_functions.length items and each item is an index
// into all_functions.
HashMap<const ZigTarget *, ZigGLibCVerList *, hash_glibc_target, eql_glibc_target> version_table;
};
Error glibc_load_metadata(ZigGLibCAbi **out_result, Buf *zig_lib_dir, bool verbose);
Error glibc_build_dummies_and_maps(CodeGen *codegen, const ZigGLibCAbi *glibc_abi, const ZigTarget *target,
Buf **out_dir, bool verbose);
// returns ErrorUnknownABI when glibc is not the native libc
Error glibc_detect_native_version(ZigGLibCVersion *glibc_ver);
size_t glibc_lib_count(void);
const ZigGLibCLib *glibc_lib_enum(size_t index);
const ZigGLibCLib *glibc_lib_find(const char *name);
#endif

79
src/link.cpp
View File

@ -11,6 +11,7 @@
#include "analyze.hpp"
#include "compiler.hpp"
#include "install_files.h"
#include "glibc.hpp"
struct LinkJob {
CodeGen *codegen;
@ -19,37 +20,6 @@ struct LinkJob {
HashMap<Buf *, bool, buf_hash, buf_eql_buf> rpath_table;
};
static CodeGen *create_child_codegen(CodeGen *parent_gen, Buf *root_src_path, OutType out_type,
ZigLibCInstallation *libc)
{
CodeGen *child_gen = codegen_create(nullptr, root_src_path, parent_gen->zig_target, out_type,
parent_gen->build_mode, parent_gen->zig_lib_dir, parent_gen->zig_std_dir, libc, get_stage1_cache_path());
child_gen->disable_gen_h = true;
child_gen->want_stack_check = WantStackCheckDisabled;
child_gen->verbose_tokenize = parent_gen->verbose_tokenize;
child_gen->verbose_ast = parent_gen->verbose_ast;
child_gen->verbose_link = parent_gen->verbose_link;
child_gen->verbose_ir = parent_gen->verbose_ir;
child_gen->verbose_llvm_ir = parent_gen->verbose_llvm_ir;
child_gen->verbose_cimport = parent_gen->verbose_cimport;
child_gen->verbose_cc = parent_gen->verbose_cc;
child_gen->llvm_argv = parent_gen->llvm_argv;
child_gen->dynamic_linker_path = parent_gen->dynamic_linker_path;
codegen_set_strip(child_gen, parent_gen->strip_debug_symbols);
child_gen->want_pic = parent_gen->have_pic ? WantPICEnabled : WantPICDisabled;
child_gen->valgrind_support = ValgrindSupportDisabled;
codegen_set_errmsg_color(child_gen, parent_gen->err_color);
codegen_set_mmacosx_version_min(child_gen, parent_gen->mmacosx_version_min);
codegen_set_mios_version_min(child_gen, parent_gen->mios_version_min);
child_gen->enable_cache = true;
return child_gen;
}
static const char *build_libc_object(CodeGen *parent_gen, const char *name, CFile *c_file) {
CodeGen *child_gen = create_child_codegen(parent_gen, nullptr, OutTypeObj, nullptr);
codegen_set_out_name(child_gen, buf_create_from_str(name));
@ -76,18 +46,6 @@ static const char *path_from_libunwind(CodeGen *g, const char *subpath) {
return path_from_zig_lib(g, "libunwind", subpath);
}
static const char *build_dummy_so(CodeGen *parent, const char *name, size_t major_version) {
Buf *glibc_dummy_root_src = buf_sprintf("%s" OS_SEP "libc" OS_SEP "dummy" OS_SEP "%s.zig",
buf_ptr(parent->zig_lib_dir), name);
CodeGen *child_gen = create_child_codegen(parent, glibc_dummy_root_src, OutTypeLib, nullptr);
codegen_set_out_name(child_gen, buf_create_from_str(name));
codegen_set_lib_version(child_gen, major_version, 0, 0);
child_gen->is_dynamic = true;
child_gen->is_dummy_so = true;
codegen_build_and_link(child_gen);
return buf_ptr(&child_gen->output_file_path);
}
static const char *build_libunwind(CodeGen *parent) {
CodeGen *child_gen = create_child_codegen(parent, nullptr, OutTypeLib, nullptr);
codegen_set_out_name(child_gen, buf_create_from_str("unwind"));
@ -892,6 +850,30 @@ static void add_rpath(LinkJob *lj, Buf *rpath) {
lj->rpath_table.put(rpath, true);
}
static void add_glibc_libs(LinkJob *lj) {
Error err;
ZigGLibCAbi *glibc_abi;
if ((err = glibc_load_metadata(&glibc_abi, lj->codegen->zig_lib_dir, true))) {
fprintf(stderr, "%s\n", err_str(err));
exit(1);
}
Buf *artifact_dir;
if ((err = glibc_build_dummies_and_maps(lj->codegen, glibc_abi, lj->codegen->zig_target,
&artifact_dir, true)))
{
fprintf(stderr, "%s\n", err_str(err));
exit(1);
}
size_t lib_count = glibc_lib_count();
for (size_t i = 0; i < lib_count; i += 1) {
const ZigGLibCLib *lib = glibc_lib_enum(i);
Buf *so_path = buf_sprintf("%s" OS_SEP "lib%s.so.%d.0.0", buf_ptr(artifact_dir), lib->name, lib->sover);
lj->args.append(buf_ptr(so_path));
}
}
static void construct_linker_job_elf(LinkJob *lj) {
CodeGen *g = lj->codegen;
@ -990,6 +972,11 @@ static void construct_linker_job_elf(LinkJob *lj) {
if (is_dyn_lib) {
lj->args.append("-soname");
lj->args.append(buf_ptr(soname));
if (g->version_script_path != nullptr) {
lj->args.append("-version-script");
lj->args.append(buf_ptr(g->version_script_path));
}
}
// .o files
@ -1053,11 +1040,7 @@ static void construct_linker_job_elf(LinkJob *lj) {
}
} else if (target_is_glibc(g->zig_target)) {
lj->args.append(build_libunwind(g));
lj->args.append(build_dummy_so(g, "c", 6));
lj->args.append(build_dummy_so(g, "m", 6));
lj->args.append(build_dummy_so(g, "pthread", 0));
lj->args.append(build_dummy_so(g, "dl", 2));
lj->args.append(build_dummy_so(g, "rt", 1));
add_glibc_libs(lj);
lj->args.append(get_libc_crt_file(g, "libc_nonshared.a"));
} else if (target_is_musl(g->zig_target)) {
lj->args.append(build_libunwind(g));

56
src/main.cpp
View File

@ -15,6 +15,7 @@
#include "target.hpp"
#include "libc_installation.hpp"
#include "userland.h"
#include "glibc.hpp"
#include <stdio.h>
@ -96,6 +97,7 @@ static int print_full_usage(const char *arg0, FILE *file, int return_code) {
" --forbid-library [lib] make it an error to link against lib\n"
" --library-path [dir] add a directory to the library search path\n"
" --linker-script [path] use a custom linker script\n"
" --version-script [path] provide a version .map file\n"
" --object [obj] add object file to build\n"
" -L[dir] alias for --library-path\n"
" -rdynamic add all symbols to the dynamic symbol table\n"
@ -189,10 +191,33 @@ static int print_target_list(FILE *f) {
for (size_t i = 0; i < libc_count; i += 1) {
ZigTarget libc_target;
target_libc_enum(i, &libc_target);
fprintf(f, " %s-%s-%s\n", target_arch_name(libc_target.arch),
target_os_name(libc_target.os), target_abi_name(libc_target.abi));
bool is_native = native.arch == libc_target.arch &&
native.os == libc_target.os &&
native.abi == libc_target.abi;
const char *native_str = is_native ? " (native)" : "";
fprintf(f, " %s-%s-%s%s\n", target_arch_name(libc_target.arch),
target_os_name(libc_target.os), target_abi_name(libc_target.abi), native_str);
}
fprintf(f, "\nAvailable glibc versions:\n");
ZigGLibCAbi *glibc_abi;
Error err;
if ((err = glibc_load_metadata(&glibc_abi, get_zig_lib_dir(), true))) {
return EXIT_FAILURE;
}
for (size_t i = 0; i < glibc_abi->all_versions.length; i += 1) {
ZigGLibCVersion *this_ver = &glibc_abi->all_versions.at(i);
bool is_native = native.glibc_version != nullptr &&
native.glibc_version->major == this_ver->major &&
native.glibc_version->minor == this_ver->minor &&
native.glibc_version->patch == this_ver->patch;
const char *native_str = is_native ? " (native)" : "";
if (this_ver->patch == 0) {
fprintf(f, " %d.%d%s\n", this_ver->major, this_ver->minor, native_str);
} else {
fprintf(f, " %d.%d.%d%s\n", this_ver->major, this_ver->minor, this_ver->patch, native_str);
}
}
return EXIT_SUCCESS;
}
@ -437,6 +462,8 @@ int main(int argc, char **argv) {
const char *mmacosx_version_min = nullptr;
const char *mios_version_min = nullptr;
const char *linker_script = nullptr;
Buf *version_script = nullptr;
const char *target_glibc = nullptr;
ZigList<const char *> rpath_list = {0};
bool each_lib_rpath = false;
ZigList<const char *> objects = {0};
@ -783,6 +810,10 @@ int main(int argc, char **argv) {
frameworks.append(argv[i]);
} else if (strcmp(arg, "--linker-script") == 0) {
linker_script = argv[i];
} else if (strcmp(arg, "--version-script") == 0) {
version_script = buf_create_from_str(argv[i]);
} else if (strcmp(arg, "-target-glibc") == 0) {
target_glibc = argv[i];
} else if (strcmp(arg, "-rpath") == 0) {
rpath_list.append(argv[i]);
} else if (strcmp(arg, "--test-filter") == 0) {
@ -904,6 +935,10 @@ int main(int argc, char **argv) {
ZigTarget target;
if (target_string == nullptr) {
get_native_target(&target);
if (target_glibc != nullptr) {
fprintf(stderr, "-target-glibc provided but no -target parameter\n");
return print_error_usage(arg0);
}
} else {
if ((err = target_parse_triple(&target, target_string))) {
if (err == ErrorUnknownArchitecture && target.arch != ZigLLVM_UnknownArch) {
@ -921,6 +956,22 @@ int main(int argc, char **argv) {
return print_error_usage(arg0);
}
}
if (target_is_glibc(&target)) {
target.glibc_version = allocate<ZigGLibCVersion>(1);
if (target_glibc != nullptr) {
if ((err = target_parse_glibc_version(target.glibc_version, target_glibc))) {
fprintf(stderr, "invalid glibc version '%s': %s\n", target_glibc, err_str(err));
return print_error_usage(arg0);
}
} else {
// Default cross-compiling glibc version
*target.glibc_version = {2, 17, 0};
}
} else if (target_glibc != nullptr) {
fprintf(stderr, "'%s' is not a glibc-compatible target", target_string);
return print_error_usage(arg0);
}
}
if (output_dir != nullptr && enable_cache == CacheOptOn) {
@ -1074,6 +1125,7 @@ int main(int argc, char **argv) {
codegen_set_is_test(g, cmd == CmdTest);
g->want_single_threaded = want_single_threaded;
codegen_set_linker_script(g, linker_script);
g->version_script_path = version_script;
if (each_lib_rpath)
codegen_set_each_lib_rpath(g, each_lib_rpath);

36
src/target.cpp
View File

@ -10,6 +10,8 @@
#include "target.hpp"
#include "util.hpp"
#include "os.hpp"
#include "compiler.hpp"
#include "glibc.hpp"
#include <stdio.h>
@ -466,6 +468,29 @@ const char *target_abi_name(ZigLLVM_EnvironmentType abi) {
return ZigLLVMGetEnvironmentTypeName(abi);
}
Error target_parse_glibc_version(ZigGLibCVersion *glibc_ver, const char *text) {
glibc_ver->major = 2;
glibc_ver->minor = 0;
glibc_ver->patch = 0;
SplitIterator it = memSplit(str(text), str("GLIBC_."));
{
Optional<Slice<uint8_t>> opt_component = SplitIterator_next(&it);
if (!opt_component.is_some) return ErrorUnknownABI;
glibc_ver->major = strtoul(buf_ptr(buf_create_from_slice(opt_component.value)), nullptr, 10);
}
{
Optional<Slice<uint8_t>> opt_component = SplitIterator_next(&it);
if (!opt_component.is_some) return ErrorNone;
glibc_ver->minor = strtoul(buf_ptr(buf_create_from_slice(opt_component.value)), nullptr, 10);
}
{
Optional<Slice<uint8_t>> opt_component = SplitIterator_next(&it);
if (!opt_component.is_some) return ErrorNone;
glibc_ver->patch = strtoul(buf_ptr(buf_create_from_slice(opt_component.value)), nullptr, 10);
}
return ErrorNone;
}
void get_native_target(ZigTarget *target) {
ZigLLVM_OSType os_type;
ZigLLVM_ObjectFormatType oformat; // ignored; based on arch/os
@ -481,6 +506,17 @@ void get_native_target(ZigTarget *target) {
if (target->abi == ZigLLVM_UnknownEnvironment) {
target->abi = target_default_abi(target->arch, target->os);
}
target->glibc_version = nullptr;
#ifdef ZIG_OS_LINUX
if (target_is_glibc(target)) {
target->glibc_version = allocate<ZigGLibCVersion>(1);
Error err;
if ((err = glibc_detect_native_version(target->glibc_version))) {
// Use a default version.
*target->glibc_version = {2, 17, 0};
}
}
#endif
}
Error target_parse_archsub(ZigLLVM_ArchType *out_arch, ZigLLVM_SubArchType *out_sub,

9
src/target.hpp
View File

@ -77,12 +77,19 @@ enum TargetSubsystem {
TargetSubsystemAuto
};
struct ZigGLibCVersion {
uint32_t major; // always 2
uint32_t minor;
uint32_t patch;
};
struct ZigTarget {
ZigLLVM_ArchType arch;
ZigLLVM_SubArchType sub_arch;
ZigLLVM_VendorType vendor;
Os os;
ZigLLVM_EnvironmentType abi;
ZigGLibCVersion *glibc_version; // null means default
bool is_native;
};
@ -105,6 +112,8 @@ Error target_parse_archsub(ZigLLVM_ArchType *arch, ZigLLVM_SubArchType *sub,
Error target_parse_os(Os *os, const char *os_ptr, size_t os_len);
Error target_parse_abi(ZigLLVM_EnvironmentType *abi, const char *abi_ptr, size_t abi_len);
Error target_parse_glibc_version(ZigGLibCVersion *out, const char *text);
size_t target_arch_count(void);
ZigLLVM_ArchType target_arch_enum(size_t index);
const char *target_arch_name(ZigLLVM_ArchType arch);

26
src/util.cpp
View File

@ -86,6 +86,32 @@ Optional<Slice<uint8_t>> SplitIterator_next(SplitIterator *self) {
return Optional<Slice<uint8_t>>::some(self->buffer.slice(start, end));
}
// Ported from std/mem.zig.
// This one won't collapse multiple separators into one, so you could use it, for example,
// to parse Comma Separated Value format.
Optional<Slice<uint8_t>> SplitIterator_next_separate(SplitIterator *self) {
// move to beginning of token
if (self->index < self->buffer.len &&
SplitIterator_isSplitByte(self, self->buffer.ptr[self->index]))
{
self->index += 1;
}
size_t start = self->index;
if (start == self->buffer.len) {
return {};
}
// move to end of token
while (self->index < self->buffer.len &&
!SplitIterator_isSplitByte(self, self->buffer.ptr[self->index]))
{
self->index += 1;
}
size_t end = self->index;
return Optional<Slice<uint8_t>>::some(self->buffer.slice(start, end));
}
// Ported from std/mem.zig
Slice<uint8_t> SplitIterator_rest(SplitIterator *self) {
// move to beginning of token

1
src/util.hpp
View File

@ -314,6 +314,7 @@ struct SplitIterator {
bool SplitIterator_isSplitByte(SplitIterator *self, uint8_t byte);
Optional< Slice<uint8_t> > SplitIterator_next(SplitIterator *self);
Optional< Slice<uint8_t> > SplitIterator_next_separate(SplitIterator *self);
Slice<uint8_t> SplitIterator_rest(SplitIterator *self);
SplitIterator memSplit(Slice<uint8_t> buffer, Slice<uint8_t> split_bytes);