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Commit 12e7092

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alessandrodalessandrod
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Add BPF target
This change adds the bpfel-unknown-none and bpfeb-unknown-none targets which can be used to generate little endian and big endian BPF
1 parent 92418ce commit 12e7092

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18 files changed

+250
-3
lines changed

18 files changed

+250
-3
lines changed

‎compiler/rustc_codegen_cranelift/src/toolchain.rs‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -67,6 +67,7 @@ fn linker_and_flavor(sess: &Session) -> (PathBuf, LinkerFlavor) {
6767
LinkerFlavor::Msvc => "link.exe",
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LinkerFlavor::Lld(_) => "lld",
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LinkerFlavor::PtxLinker => "rust-ptx-linker",
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LinkerFlavor::BpfLinker => "bpf-linker",
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}),
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flavor,
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)),

‎compiler/rustc_codegen_ssa/src/back/link.rs‎

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@@ -989,6 +989,7 @@ fn linker_and_flavor(sess: &Session) -> (PathBuf, LinkerFlavor) {
989989
LinkerFlavor::Msvc => "link.exe",
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LinkerFlavor::Lld(_) => "lld",
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LinkerFlavor::PtxLinker => "rust-ptx-linker",
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LinkerFlavor::BpfLinker => "bpf-linker",
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}),
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flavor,
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)),

‎compiler/rustc_codegen_ssa/src/back/linker.rs‎

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Original file line numberDiff line numberDiff line change
@@ -84,6 +84,7 @@ impl LinkerInfo {
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LinkerFlavor::PtxLinker => {
8585
Box::new(PtxLinker { cmd, sess, info: self }) as Box<dyn Linker>
8686
}
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LinkerFlavor::BpfLinker => Box::new(BpfLinker { cmd, sess, info: self }) as Box<dyn Linker>
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}
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}
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}
@@ -1431,3 +1432,124 @@ impl<'a> Linker for PtxLinker<'a> {
14311432

14321433
fn linker_plugin_lto(&mut self) {}
14331434
}
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pub struct BpfLinker<'a> {
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cmd: Command,
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sess: &'a Session,
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info: &'a LinkerInfo,
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}
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impl<'a> Linker for BpfLinker<'a> {
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fn cmd(&mut self) -> &mut Command {
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&mut self.cmd
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}
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fn set_output_kind(&mut self, _output_kind: LinkOutputKind, _out_filename: &Path) {}
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fn link_rlib(&mut self, path: &Path) {
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self.cmd.arg(path);
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}
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fn link_whole_rlib(&mut self, path: &Path) {
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self.cmd.arg(path);
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}
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fn include_path(&mut self, path: &Path) {
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self.cmd.arg("-L").arg(path);
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}
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fn debuginfo(&mut self, _strip: Strip) {
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self.cmd.arg("--debug");
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}
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fn add_object(&mut self, path: &Path) {
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self.cmd.arg(path);
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}
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fn optimize(&mut self) {
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self.cmd.arg(match self.sess.opts.optimize {
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OptLevel::No => "-O0",
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OptLevel::Less => "-O1",
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OptLevel::Default => "-O2",
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OptLevel::Aggressive => "-O3",
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OptLevel::Size => "-Os",
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OptLevel::SizeMin => "-Oz",
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});
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}
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fn output_filename(&mut self, path: &Path) {
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self.cmd.arg("-o").arg(path);
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}
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fn finalize(&mut self) {
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self.cmd.arg("--cpu").arg(match self.sess.opts.cg.target_cpu {
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Some(ref s) => s,
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None => &self.sess.target.options.cpu,
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});
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}
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fn link_dylib(&mut self, _lib: Symbol, _verbatim: bool, _as_needed: bool) {
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panic!("external dylibs not supported")
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}
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fn link_rust_dylib(&mut self, _lib: Symbol, _path: &Path) {
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panic!("external dylibs not supported")
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}
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fn link_staticlib(&mut self, _lib: Symbol, _verbatim: bool) {
1500+
panic!("staticlibs not supported")
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}
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fn link_whole_staticlib(&mut self, _lib: Symbol, _verbatim: bool, _search_path: &[PathBuf]) {
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panic!("staticlibs not supported")
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}
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fn framework_path(&mut self, _path: &Path) {
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panic!("frameworks not supported")
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}
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fn link_framework(&mut self, _framework: Symbol, _as_needed: bool) {
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panic!("frameworks not supported")
1513+
}
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fn full_relro(&mut self) {}
1516+
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fn partial_relro(&mut self) {}
1518+
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fn no_relro(&mut self) {}
1520+
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fn gc_sections(&mut self, _keep_metadata: bool) {}
1522+
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fn no_gc_sections(&mut self) {}
1524+
1525+
fn pgo_gen(&mut self) {}
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1527+
fn no_crt_objects(&mut self) {}
1528+
1529+
fn no_default_libraries(&mut self) {}
1530+
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fn control_flow_guard(&mut self) {}
1532+
1533+
fn export_symbols(&mut self, tmpdir: &Path, crate_type: CrateType) {
1534+
let path = tmpdir.join("symbols");
1535+
let res: io::Result<()> = try {
1536+
let mut f = BufWriter::new(File::create(&path)?);
1537+
for sym in self.info.exports[&crate_type].iter() {
1538+
writeln!(f, "{}", sym)?;
1539+
}
1540+
};
1541+
if let Err(e) = res {
1542+
self.sess.fatal(&format!("failed to write symbols file: {}", e));
1543+
} else {
1544+
self.cmd.arg("--export-symbols").arg(&path);
1545+
}
1546+
}
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fn subsystem(&mut self, _subsystem: &str) {}
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1550+
fn group_start(&mut self) {}
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fn group_end(&mut self) {}
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fn linker_plugin_lto(&mut self) {}
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}

‎compiler/rustc_llvm/build.rs‎

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Original file line numberDiff line numberDiff line change
@@ -86,6 +86,7 @@ fn main() {
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"nvptx",
8787
"hexagon",
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"riscv",
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"bpf",
8990
];
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9192
let required_components = &[

‎compiler/rustc_llvm/src/lib.rs‎

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Original file line numberDiff line numberDiff line change
@@ -167,4 +167,12 @@ pub fn initialize_available_targets() {
167167
LLVMInitializeWebAssemblyAsmPrinter,
168168
LLVMInitializeWebAssemblyAsmParser
169169
);
170+
init_target!(
171+
llvm_component = "bpf",
172+
LLVMInitializeBPFTargetInfo,
173+
LLVMInitializeBPFTarget,
174+
LLVMInitializeBPFTargetMC,
175+
LLVMInitializeBPFAsmPrinter,
176+
LLVMInitializeBPFAsmParser
177+
);
170178
}

‎compiler/rustc_target/src/abi/call/bpf.rs‎

Lines changed: 31 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,31 @@
1+
// see BPFCallingConv.td
2+
use crate::abi::call::{ArgAbi, FnAbi};
3+
4+
fn classify_ret<Ty>(ret: &mut ArgAbi<'_, Ty>) {
5+
if ret.layout.is_aggregate() || ret.layout.size.bits() > 64 {
6+
ret.make_indirect();
7+
} else {
8+
ret.extend_integer_width_to(64);
9+
}
10+
}
11+
12+
fn classify_arg<Ty>(arg: &mut ArgAbi<'_, Ty>) {
13+
if arg.layout.is_aggregate() || arg.layout.size.bits() > 64 {
14+
arg.make_indirect();
15+
} else {
16+
arg.extend_integer_width_to(64);
17+
}
18+
}
19+
20+
pub fn compute_abi_info<Ty>(fn_abi: &mut FnAbi<'_, Ty>) {
21+
if !fn_abi.ret.is_ignore() {
22+
classify_ret(&mut fn_abi.ret);
23+
}
24+
25+
for arg in &mut fn_abi.args {
26+
if arg.is_ignore() {
27+
continue;
28+
}
29+
classify_arg(arg);
30+
}
31+
}

‎compiler/rustc_target/src/abi/call/mod.rs‎

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Original file line numberDiff line numberDiff line change
@@ -6,6 +6,7 @@ mod aarch64;
66
mod amdgpu;
77
mod arm;
88
mod avr;
9+
mod bpf;
910
mod hexagon;
1011
mod mips;
1112
mod mips64;
@@ -654,6 +655,7 @@ impl<'a, Ty> FnAbi<'a, Ty> {
654655
}
655656
}
656657
"asmjs" => wasm::compute_c_abi_info(cx, self),
658+
"bpfel" | "bpfeb" => bpf::compute_abi_info(self),
657659
a => return Err(format!("unrecognized arch \"{}\" in target specification", a)),
658660
}
659661

‎compiler/rustc_target/src/spec/bpf_base.rs‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,37 @@
1+
use crate::spec::{LinkerFlavor, MergeFunctions, PanicStrategy, TargetOptions};
2+
use crate::{abi::Endian, spec::abi::Abi};
3+
4+
pub fn opts(endian: Endian) -> TargetOptions {
5+
TargetOptions {
6+
endian,
7+
linker_flavor: LinkerFlavor::BpfLinker,
8+
atomic_cas: false,
9+
executables: true,
10+
dynamic_linking: true,
11+
no_builtins: true,
12+
panic_strategy: PanicStrategy::Abort,
13+
position_independent_executables: true,
14+
merge_functions: MergeFunctions::Disabled,
15+
obj_is_bitcode: true,
16+
requires_lto: false,
17+
singlethread: true,
18+
max_atomic_width: Some(64),
19+
unsupported_abis: vec![
20+
Abi::Cdecl,
21+
Abi::Stdcall { unwind: false },
22+
Abi::Stdcall { unwind: true },
23+
Abi::Fastcall,
24+
Abi::Vectorcall,
25+
Abi::Thiscall { unwind: false },
26+
Abi::Thiscall { unwind: true },
27+
Abi::Aapcs,
28+
Abi::Win64,
29+
Abi::SysV64,
30+
Abi::PtxKernel,
31+
Abi::Msp430Interrupt,
32+
Abi::X86Interrupt,
33+
Abi::AmdGpuKernel,
34+
],
35+
..Default::default()
36+
}
37+
}

‎compiler/rustc_target/src/spec/bpfeb_unknown_none.rs‎

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,12 @@
1+
use crate::spec::Target;
2+
use crate::{abi::Endian, spec::bpf_base};
3+
4+
pub fn target() -> Target {
5+
Target {
6+
llvm_target: "bpfeb".to_string(),
7+
data_layout: "E-m:e-p:64:64-i64:64-i128:128-n32:64-S128".to_string(),
8+
pointer_width: 64,
9+
arch: "bpfeb".to_string(),
10+
options: bpf_base::opts(Endian::Big),
11+
}
12+
}

‎compiler/rustc_target/src/spec/bpfel_unknown_none.rs‎

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,12 @@
1+
use crate::spec::Target;
2+
use crate::{abi::Endian, spec::bpf_base};
3+
4+
pub fn target() -> Target {
5+
Target {
6+
llvm_target: "bpfel".to_string(),
7+
data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".to_string(),
8+
pointer_width: 64,
9+
arch: "bpfel".to_string(),
10+
options: bpf_base::opts(Endian::Little),
11+
}
12+
}

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