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native: initial linking support for linux (#15326)

This commit is contained in:
Spydr 2022-08-08 21:32:14 +02:00 committed by GitHub
parent a6026fd505
commit 27c5ad03f6
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GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 272 additions and 108 deletions

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@ -40,6 +40,13 @@ jobs:
echo "C Compiler:"
gcc --version
## TODO: fix the container thevlang/vlang:alpine-build, instead of using apk add here:
- name: Add dependencies
run: |
apk add libexecinfo-static
apk add libexecinfo-dev
apk add libc6-compat
- name: Build V
run: CC=gcc make

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@ -55,6 +55,11 @@ jobs:
steps:
- uses: actions/checkout@v2
- name: Install linker
if: ${{ startsWith(matrix.os, 'ubuntu')}}
run: |
sudo apt-get install --quiet -y binutils
- name: Build V with make.bat
if: ${{ startsWith(matrix.os, 'windows') }}
run: |

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@ -7,7 +7,7 @@ WORKDIR /opt/vlang
ARG USE_LOCAL
RUN apt-get update && \
DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends gcc clang make git && \
DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends gcc clang make git binutils && \
apt-get clean && rm -rf /var/cache/apt/archives/* && \
rm -rf /var/lib/apt/lists/*

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@ -12,11 +12,14 @@ RUN mkdir -p /opt/vlang && ln -s /opt/vlang/v /usr/bin/v
ARG USE_LOCAL
## libexecinfo is needed for the bundled tcc
RUN apk --no-cache add \
git make upx gcc bash \
musl-dev \
musl-dev libc-dev \
openssl-dev sqlite-dev \
libx11-dev glfw-dev freetype-dev
libx11-dev glfw-dev freetype-dev \
libexecinfo-dev libexecinfo-static \
libc6-compat gcompat binutils
## RUN apk --no-cache add --virtual sdl2deps sdl2-dev sdl2_ttf-dev sdl2_mixer-dev sdl2_image-dev
COPY . /vlang-local

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@ -2207,7 +2207,7 @@ fn (mut g Gen) fn_decl_amd64(node ast.FnDecl) {
g.println('; stack frame size: $g.stack_var_pos')
g.write32_at(local_alloc_pos + 3, g.stack_var_pos)
is_main := node.name == 'main.main'
if is_main {
if is_main && g.pref.os != .linux {
// println('end of main: gen exit')
zero := ast.IntegerLiteral{}
g.gen_exit(zero)

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@ -3,109 +3,123 @@
// that can be found in the LICENSE file.
module native
import os
const (
elf_class32 = 1
elf_class64 = 2
elf_class32 = 1
elf_class64 = 2
elf_data_le = 1
elf_data_be = 2
elf_data_le = 1
elf_data_be = 2
elf_version = 1
elf_abiversion = 0
elf_version = 1
elf_abiversion = 0
// elf type
elf_type_none = 0
elf_type_rel = 1
elf_type_exec = 2
elf_type_dyn = 3
elf_type_core = 4
elf_type_none = 0
elf_type_rel = 1
elf_type_exec = 2
elf_type_dyn = 3
elf_type_core = 4
elf_amd64 = 0x3e
elf_arm64 = 0xb7
elf_amd64 = 0x3e
elf_arm64 = 0xb7
elf_osabi_none = 0
elf_osabi_hpux = 1
elf_osabi_netbsd = 2
elf_osabi_linux = 3
elf_osabi_freebsd = 9
elf_osabi_none = 0
elf_osabi_hpux = 1
elf_osabi_netbsd = 2
elf_osabi_linux = 3
elf_osabi_freebsd = 9
elf_header_size = 0x40
elf_phentry_size = 0x38
elf_header_size = 0x40
elf_phentry_size = 0x38
// elf program header type
elf_pt_null = 0
elf_pt_load = 1
elf_pt_dynamic = 2
elf_pt_interp = 3
elf_pt_note = 4
elf_pt_shlib = 5
elf_pt_phdr = 6
elf_pt_tls = 7
elf_pt_null = 0
elf_pt_load = 1
elf_pt_dynamic = 2
elf_pt_interp = 3
elf_pt_note = 4
elf_pt_shlib = 5
elf_pt_phdr = 6
elf_pt_tls = 7
// alignment of program headers
elf_p_align = 0x1000
elf_p_align = 0x1000
// elf section header size
elf_shentry_size = 0x40
elf_shentry_size = 0x40
// elf section type
elf_sht_null = 0x00
elf_sht_progbits = 0x01
elf_sht_symtab = 0x02
elf_sht_strtab = 0x03
elf_sht_rela = 0x04
elf_sht_hash = 0x05
elf_sht_dynamic = 0x06
elf_sht_note = 0x07
elf_sht_nobits = 0x08
elf_sht_rel = 0x09
elf_sht_shlib = 0x0a
elf_sht_dynsym = 0x0b
elf_sht_null = 0x00
elf_sht_progbits = 0x01
elf_sht_symtab = 0x02
elf_sht_strtab = 0x03
elf_sht_rela = 0x04
elf_sht_hash = 0x05
elf_sht_dynamic = 0x06
elf_sht_note = 0x07
elf_sht_nobits = 0x08
elf_sht_rel = 0x09
elf_sht_shlib = 0x0a
elf_sht_dynsym = 0x0b
// elf section flags
elf_shf_write = u64(0x01)
elf_shf_alloc = u64(0x02)
elf_shf_execinstr = u64(0x04)
elf_shf_merge = u64(0x10)
elf_sht_strings = u64(0x20)
elf_shf_info_link = u64(0x40)
elf_shf_link_order = u64(0x80)
elf_shf_os_nonconforming = u64(0x100)
elf_shf_groub = u64(0x200)
elf_shf_tls = u64(0x400)
// elf symbol tables
elf_symtab_size = 0x18
elf_dynamic_size = 0x10
elf_rela_size = 0x18
elf_rel_size = 0x10
elf_sh_symtab_entsize = elf_symtab_size
elf_sh_symtab_info = 1
elf_sh_symtab_align = 8
elf_symtab_size = 0x18
elf_dynamic_size = 0x10
elf_rela_size = 0x18
elf_rel_size = 0x10
elf_sh_symtab_entsize = elf_symtab_size
elf_sh_symtab_align = 8
// elf symbol bining
elf_stb_local = u8(0)
elf_stb_global = u8(1)
elf_stb_local = u8(0)
elf_stb_global = u8(1)
// elf symbol types
elf_stt_notype = u8(0)
elf_stt_object = u8(1)
elf_stt_func = u8(2)
elf_stt_section = u8(3)
elf_stt_notype = u8(0)
elf_stt_object = u8(1)
elf_stt_func = u8(2)
elf_stt_section = u8(3)
elf_stt_file = u8(4)
// elf symbol visibility
elf_stv_default = i8(0)
elf_stv_default = i8(0)
// elf relocation types
elf_r_amd64_none = 0
elf_r_amd64_64 = 1
elf_r_amd64_pc32 = 2
elf_r_amd64_got32 = 3
elf_r_amd64_plt32 = 4
elf_r_amd64_copy = 5
elf_r_amd64_glob_dat = 6
elf_r_amd64_jump_slot = 7
elf_r_amd64_relative = 8
elf_r_amd64_gotpcrel = 9
elf_r_amd64_32 = 10
elf_r_amd64_32s = 11
elf_r_amd64_16 = 12
elf_r_amd64_pc16 = 13
elf_r_amd64_8 = 14
elf_r_amd64_pc8 = 15
elf_r_amd64_pc64 = 24
elf_r_amd64_gotoff64 = 25
elf_r_amd64_gotpc32 = 26
elf_r_amd64_size32 = 32
elf_r_amd64_size64 = 33
elf_r_amd64_none = 0
elf_r_amd64_64 = 1
elf_r_amd64_pc32 = 2
elf_r_amd64_got32 = 3
elf_r_amd64_plt32 = 4
elf_r_amd64_copy = 5
elf_r_amd64_glob_dat = 6
elf_r_amd64_jump_slot = 7
elf_r_amd64_relative = 8
elf_r_amd64_gotpcrel = 9
elf_r_amd64_32 = 10
elf_r_amd64_32s = 11
elf_r_amd64_16 = 12
elf_r_amd64_pc16 = 13
elf_r_amd64_8 = 14
elf_r_amd64_pc8 = 15
elf_r_amd64_pc64 = 24
elf_r_amd64_gotoff64 = 25
elf_r_amd64_gotpc32 = 26
elf_r_amd64_size32 = 32
elf_r_amd64_size64 = 33
)
const (
@ -370,11 +384,15 @@ fn (mut g Gen) create_symtab(mut sections []Section, mut table []SymbolTableSect
mut names := []string{len: table.len}
mut offset := 1
text_section := g.find_section_header('.text', sections)
for i, mut entry in table {
names[i] = entry.str_name
entry.name = offset
entry.shndx = i16(sections.len + 1)
if entry.name != 1 {
entry.shndx = i16(text_section) // i16(sections.len + 1)
}
offset += entry.str_name.len + 1
}
@ -382,10 +400,17 @@ fn (mut g Gen) create_symtab(mut sections []Section, mut table []SymbolTableSect
sections << g.create_section('.strtab', native.elf_sht_strtab, 0, 0, 1, 0, g.create_string_table_section(names))
sections << // index of .strtab
g.create_section('.symtab', native.elf_sht_symtab, sections.len - 1, native.elf_sh_symtab_info,
g.create_section('.symtab', native.elf_sht_symtab, sections.len - 1, table.len - 1,
native.elf_sh_symtab_align, native.elf_sh_symtab_entsize, table)
}
fn (mut g Gen) create_progbits(name string, flags u64, data []u8) Section {
mut section := g.create_section(name, native.elf_sht_progbits, 0, 0, 1, data.len,
ProgBitsSection{data})
section.header.flags = i64(flags)
return section
}
fn (mut g Gen) find_section_header(name string, sections []Section) int {
for i, section in sections {
if name == section.name {
@ -434,7 +459,7 @@ fn (mut g Gen) gen_sections(mut sections []Section) {
fn (mut g Gen) gen_symtab_data(section Section, data []SymbolTableSection) {
for symbol in data {
if symbol.str_name == '_start' {
if symbol.str_name == 'main' { // represents the C main function
g.start_symbol_addr = g.pos()
}
@ -477,13 +502,7 @@ fn (mut g Gen) gen_section_data(sections []Section) {
g.gen_symtab_data(section, data)
}
ProgBitsSection {
start := g.pos()
g.write(data.bytes)
g.println('; SHT_PROGBITS Section')
size := g.pos() - start
g.write64_at(section.header.offset + 32, i64(size))
// progbits have to be handled by the user.
}
RelASection {
g.write64(data.offset)
@ -579,7 +598,7 @@ mut:
*/
pub fn (mut g Gen) generate_elf_header() {
elf_type := native.elf_type_exec // PIE (use _exec for non-relocatable executables)
elf_type := native.elf_type_rel // PIE (use _exec for non-relocatable executables)
// generate program headers
mut program_headers := []ProgramHeader{}
@ -588,12 +607,19 @@ pub fn (mut g Gen) generate_elf_header() {
// generate sections
mut sections := [
Section{}, // null section as first section
g.create_progbits('.text', native.elf_shf_alloc | native.elf_shf_execinstr, []),
g.create_progbits('.data', native.elf_shf_write | native.elf_shf_alloc, []),
g.create_progbits('.bss', native.elf_shf_write | native.elf_shf_alloc, []),
]
mut symbols := [
SymbolTableSection{}, // first is null
g.create_symbol_table_section('_start', native.elf_stt_notype, native.elf_stb_global,
native.elf_stv_default, 0, 0), // _start label points to entry point address
g.create_symbol_table_section('test.v', native.elf_stt_file, native.elf_stb_local,
native.elf_stv_default, 0, 0), // source file TODO: replace test.v with actual source file name
g.create_symbol_table_section('.text', native.elf_stt_section, native.elf_stb_local,
native.elf_stv_default, 0, 0), // .text section
g.create_symbol_table_section('main', native.elf_stt_func, native.elf_stb_global,
native.elf_stv_default, 0, 0), // main label points to entry point address
]
g.create_symtab(mut sections, mut symbols) // create the .symtab section
g.create_shstrtab(mut sections) // create the .shstrtab section (this must be the last section!)
@ -615,7 +641,6 @@ pub fn (mut g Gen) generate_elf_header() {
}
g.write32(native.elf_version)
e_entry_addr := g.pos()
g.write64(0) // e_entry (temp value)
g.write64(native.elf_header_size) // e_phoff
g.write64(native.elf_header_size + native.elf_phentry_size * program_headers.len) // e_shoff
@ -646,17 +671,25 @@ pub fn (mut g Gen) generate_elf_header() {
g.code_start_pos = g.pos()
g.debug_pos = int(g.pos())
if elf_type == native.elf_type_exec {
g.write64_at(e_entry_addr, g.code_start_pos + native.segment_start)
}
if g.start_symbol_addr > 0 {
g.write64_at(g.start_symbol_addr + native.elf_symtab_size - 16, g.code_start_pos +
native.segment_start)
}
// if g.start_symbol_addr > 0 {
// g.write64_at(g.start_symbol_addr + native.elf_symtab_size - 16, g.code_start_pos + native.segment_start)
//}
text_section := sections[g.find_section_header('.text', sections)]
g.elf_text_header_addr = text_section.header.offset
g.write64_at(g.elf_text_header_addr + 24, g.pos()) // write the code start pos to the text section
g.call(native.placeholder)
g.println('; call main.main')
if g.pref.arch == .arm64 {
} else {
g.mov64(.rax, 0)
}
g.ret()
g.println('; return 0')
g.write64_at(g.start_symbol_addr + native.elf_symtab_size - 8, g.pos() - g.code_start_pos) // write 'main' function size
g.debug_pos = g.buf.len
g.call(native.placeholder) // call main function, it's not guaranteed to be the first, we don't know its address yet
g.println('; call fn main')
}
fn (mut g Gen) elf_string_table() {
@ -695,5 +728,88 @@ pub fn (mut g Gen) generate_elf_footer() {
// -5 is for "e8 00 00 00 00"
g.write32_at(g.code_start_pos + 1, int(g.main_fn_addr - g.code_start_pos) - 5)
}
// write size of text section into section header
g.write64_at(g.elf_text_header_addr + 32, g.pos() - g.code_start_pos)
g.create_executable()
}
pub fn (mut g Gen) prepend_vobjpath(paths []string) []string {
vopath := os.getenv('VOBJPATH')
if vopath == '' {
return paths
}
mut res := paths.clone()
res.insert(0, vopath)
return res
}
pub fn (mut g Gen) find_o_path(fname string) string {
opaths := g.prepend_vobjpath(['/usr/lib', '/usr/lib/x86_64-linux-gnu'])
for opath in opaths {
fpath := os.join_path_single(opath, fname)
if os.is_file(fpath) {
return fpath
}
}
return '/dev/null'
}
pub fn (mut g Gen) get_lpaths() string {
lpaths := g.prepend_vobjpath(['/usr/lib/x86_64-linux-gnu', '/usr/lib64', '/lib64', '/usr/lib',
'/lib'])
return lpaths.map('-L$it').join(' ')
}
pub fn (mut g Gen) link_elf_file(obj_file string) {
crt1 := g.find_o_path('crt1.o')
crti := g.find_o_path('crti.o')
crtn := g.find_o_path('crtn.o')
lpaths := g.get_lpaths()
linker_args := [
'-v',
lpaths,
'-m elf_x86_64',
'-dynamic-linker',
'/lib64/ld-linux-x86-64.so.2',
crt1,
crti,
'-lc',
'-lm',
'-lpthread',
crtn,
'$obj_file',
'-o $g.out_name',
]
slinker_args := linker_args.join(' ')
mut ldlld := 'ld'
/*
match g.pref.os {
.linux { ldlld = 'ld.lld' }
.windows { ldlld = 'lld-link' }
.macos { ldlld = 'ld64.lld' }
else {}
}
*/
custom_linker := os.getenv('VLINKER')
if custom_linker != '' {
ldlld = custom_linker
}
linker_path := os.real_path(ldlld)
linker_cmd := '${os.quoted_path(linker_path)} $slinker_args'
if g.pref.is_verbose {
println(linker_cmd)
}
res := os.execute(linker_cmd)
if res.exit_code != 0 {
g.n_error('ELF linking failed ($ldlld):\n$res.output')
return
}
if g.pref.is_verbose {
println('linking with $ldlld finished successfully:\n$res.output')
}
}

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@ -31,7 +31,9 @@ mut:
sect_header_name_pos int
offset i64
file_size_pos i64
elf_text_header_addr i64
main_fn_addr i64
main_fn_size i64
start_symbol_addr i64
code_start_pos i64 // location of the start of the assembly instructions
fn_addr map[string]i64
@ -222,6 +224,7 @@ pub fn gen(files []&ast.File, table &ast.Table, out_name string, pref &pref.Pref
}
g.generate_builtins()
g.generate_footer()
return g.nlines, g.buf.len
}
@ -252,8 +255,21 @@ pub fn (mut g Gen) generate_header() {
}
pub fn (mut g Gen) create_executable() {
// Create the binary // should be .o ?
os.write_file_array(g.out_name, g.buf) or { panic(err) }
obj_name := match g.pref.os {
.linux { g.out_name + '.o' }
else { g.out_name }
}
os.write_file_array(obj_name, g.buf) or { panic(err) }
match g.pref.os {
// TEMPORARY
.linux { // TEMPORARY
g.link(obj_name)
} // TEMPORARY
else {} // TEMPORARY
} // TEMPORARY
os.chmod(g.out_name, 0o775) or { panic(err) } // make it executable
if g.pref.is_verbose {
eprintln('\n$g.out_name: native binary has been successfully generated')
@ -282,6 +298,17 @@ pub fn (mut g Gen) generate_footer() {
}
}
pub fn (mut g Gen) link(obj_name string) {
match g.pref.os {
.linux {
g.link_elf_file(obj_name)
}
else {
g.n_error('native linking is not implemented for $g.pref.os')
}
}
}
pub fn (mut g Gen) stmts(stmts []ast.Stmt) {
for stmt in stmts {
g.stmt(stmt)

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@ -36,7 +36,8 @@ fn test_native() {
relative_test_path := full_test_path.replace(vroot + '/', '')
work_test_path := '$wrkdir/$test_file_name'
exe_test_path := '$wrkdir/${test_file_name}.exe'
cmd := '${os.quoted_path(vexe)} -o ${os.quoted_path(exe_test_path)} -b native ${os.quoted_path(full_test_path)}'
tmperrfile := '$dir/${test}.tmperr'
cmd := '${os.quoted_path(vexe)} -o ${os.quoted_path(exe_test_path)} -b native ${os.quoted_path(full_test_path)} 2> ${os.quoted_path(tmperrfile)}'
if is_verbose {
println(cmd)
}
@ -44,9 +45,14 @@ fn test_native() {
if res_native.exit_code != 0 {
bench.fail()
eprintln(bench.step_message_fail(cmd))
if os.exists(tmperrfile) {
err := os.read_file(tmperrfile) or { panic(err) }
eprintln(err)
}
continue
}
tmperrfile := '$dir/${test}.tmperr'
res := os.execute('${os.quoted_path(exe_test_path)} 2> ${os.quoted_path(tmperrfile)}')
if res.exit_code != 0 {
bench.fail()