219 lines
8.0 KiB
Rust
219 lines
8.0 KiB
Rust
//! Pure type-synthesis and IR-shaping helpers.
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//!
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//! Free functions extracted from `lib.rs` during the 18g tidy split.
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//! None of these touch the `Emitter` state — they map AILang `Type`s
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//! to LLVM type strings, mangling descriptors, or built-in op
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//! signatures. Submodule access to the parent module's private
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//! `Result`, `CodegenError`, and `FnSig` works through normal Rust
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//! visibility (a submodule sees its parent's private items).
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use ailang_core::ast::*;
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use super::{CodegenError, FnSig, Result};
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pub(crate) fn llvm_type(t: &Type) -> Result<String> {
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match t {
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Type::Con { name, .. } => match name.as_str() {
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"Int" => Ok("i64".into()),
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"Bool" => Ok("i1".into()),
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"Unit" => Ok("i8".into()),
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"Str" => Ok("ptr".into()),
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// All other type names are treated as ADT (boxed).
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// If the typechecker didn't reject this earlier, it's
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// intentional — otherwise `ptr` would mask a wrong value.
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_ => Ok("ptr".into()),
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},
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// Function values (Iter 7): all fn-pointers are opaque `ptr`
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// at the LLVM level. The actual signature travels via the
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// emitter's `ssa_fn_sigs` sidetable.
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Type::Fn { .. } => Ok("ptr".into()),
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// Iter 13b: an unresolved rigid `Type::Var` reaching codegen is
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// a substitution bug. Earlier this silently lowered as `ptr`
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// (via the ADT fallback) and produced garbage IR; failing loudly
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// here surfaces the bug in the test suite.
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Type::Var { name } => Err(CodegenError::UnsupportedType(format!(
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"unresolved type var `{name}` in codegen"
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))),
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other => Err(CodegenError::UnsupportedType(
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ailang_core::pretty::type_to_string(other),
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)),
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}
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}
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/// Builds an `FnSig` (LLVM types only) from an AILang `Type::Fn`.
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/// Returns `None` for non-function types or if any param/ret type fails
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/// to lower (e.g. a residual `Type::Var` or `Forall` that the typechecker
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/// would reject before us).
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pub(crate) fn fn_sig_from_type(t: &Type) -> Option<FnSig> {
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if let Type::Fn { params, ret, .. } = t {
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let p: Result<Vec<String>> = params.iter().map(llvm_type).collect();
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let r = llvm_type(ret);
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if let (Ok(p), Ok(r)) = (p, r) {
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return Some(FnSig { params: p, ret: r });
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}
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}
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None
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}
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/// Iter 12b: AILang type of a builtin operator. Used by
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/// `synth_arg_type` for arg-type inference at polymorphic call sites.
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/// Mirrors what the typechecker installs in its env via `builtins`.
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pub(crate) fn builtin_ail_type(name: &str) -> Option<Type> {
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let int_int_int = || Type::Fn {
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params: vec![Type::int(), Type::int()],
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ret: Box::new(Type::int()),
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effects: vec![],
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param_modes: vec![],
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ret_mode: ParamMode::Implicit,
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};
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let int_int_bool = || Type::Fn {
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params: vec![Type::int(), Type::int()],
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ret: Box::new(Type::bool_()),
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effects: vec![],
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param_modes: vec![],
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ret_mode: ParamMode::Implicit,
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};
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Some(match name {
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"+" | "-" | "*" | "/" | "%" => int_int_int(),
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"!=" | "<" | "<=" | ">" | ">=" => int_int_bool(),
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// Iter 16e: `==` is polymorphic — `forall a. (a, a) -> Bool`.
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// The mono pipeline asks `synth_arg_type` for the actual arg
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// types at the call site; `lower_app` then dispatches to the
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// right LLVM instruction (icmp eq i64 / i1, @strcmp, or
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// constant i1 1) on those resolved types.
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"==" => Type::Forall {
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vars: vec!["a".into()],
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constraints: vec![],
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body: Box::new(Type::Fn {
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params: vec![
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Type::Var { name: "a".into() },
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Type::Var { name: "a".into() },
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],
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ret: Box::new(Type::bool_()),
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effects: vec![],
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param_modes: vec![],
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ret_mode: ParamMode::Implicit,
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}),
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},
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"not" => Type::Fn {
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params: vec![Type::bool_()],
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ret: Box::new(Type::bool_()),
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effects: vec![],
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param_modes: vec![],
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ret_mode: ParamMode::Implicit,
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},
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// Iter 16d: `__unreachable__` is the polymorphic bottom value
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// (`forall a. a`). Mirrors the typechecker's `builtins::install`.
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"__unreachable__" => Type::Forall {
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vars: vec!["a".into()],
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constraints: vec![],
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body: Box::new(Type::Var { name: "a".into() }),
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},
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_ => return None,
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})
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}
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/// Iter 12b: AILang return type of a built-in effect op. The op's
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/// param signature is irrelevant here since we only consume the ret.
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pub(crate) fn builtin_effect_op_ret(op: &str) -> Option<Type> {
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Some(match op {
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"io/print_int" | "io/print_bool" | "io/print_str" => Type::unit(),
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_ => return None,
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})
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}
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/// Iter 12b: a stable, identifier-safe descriptor for a `Type`.
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/// Maps `Int → I`, `Bool → B`, `Unit → U`, `Str → S`, ADT name `Foo →
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/// FFoo`, fn → `F<params...>R<ret>` (no recursion guard since types in
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/// the MVP are non-recursive at the type level).
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pub(crate) fn type_descriptor(t: &Type) -> String {
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match t {
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Type::Con { name, args } => {
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let head = match name.as_str() {
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"Int" => "I".into(),
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"Bool" => "B".into(),
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"Unit" => "U".into(),
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"Str" => "S".into(),
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other => format!("F{other}"),
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};
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if args.is_empty() {
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head
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} else {
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// Iter 13a: parameterised ADTs get their type-arg
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// descriptors appended, e.g. `FBox` of `Int` → `FBox_I`.
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let mut s = head;
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for a in args {
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s.push('_');
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s.push_str(&type_descriptor(a));
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}
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s
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}
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}
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Type::Fn { params, ret, .. } => {
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let mut s = String::from("Fn");
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for p in params {
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s.push('_');
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s.push_str(&type_descriptor(p));
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}
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s.push_str("__r_");
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s.push_str(&type_descriptor(ret));
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s
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}
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Type::Var { name } => format!("V{name}"),
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Type::Forall { .. } => "FORALL".into(),
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}
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}
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pub(crate) fn builtin_binop(name: &str) -> Option<(&'static str, &'static str)> {
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Some(match name {
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"+" => ("add", "i64"),
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"-" => ("sub", "i64"),
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"*" => ("mul", "i64"),
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"/" => ("sdiv", "i64"),
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"%" => ("srem", "i64"),
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"==" => ("icmp eq", "i1"),
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"!=" => ("icmp ne", "i1"),
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"<" => ("icmp slt", "i1"),
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"<=" => ("icmp sle", "i1"),
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">" => ("icmp sgt", "i1"),
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">=" => ("icmp sge", "i1"),
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_ => return None,
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})
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}
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pub(crate) fn c_byte_len(s: &str) -> usize {
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s.len() + 1 // + NUL terminator
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}
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/// Escapes a string for LLVM IR `c"..."`. All bytes outside
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/// 0x20..0x7E are escaped as `\HH`; `"` and `\` likewise. Ends with `\00`.
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pub(crate) fn default_triple() -> &'static str {
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// In the MVP we query the compile host. For cross-compilation this
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// would need to be configurable — not needed now.
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if cfg!(target_os = "linux") && cfg!(target_arch = "x86_64") {
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"x86_64-pc-linux-gnu"
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} else if cfg!(target_os = "macos") && cfg!(target_arch = "aarch64") {
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"arm64-apple-darwin"
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} else if cfg!(target_os = "macos") && cfg!(target_arch = "x86_64") {
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"x86_64-apple-darwin"
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} else if cfg!(target_arch = "aarch64") {
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"aarch64-unknown-linux-gnu"
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} else {
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"x86_64-pc-linux-gnu"
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}
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}
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pub(crate) fn ll_string_literal(s: &str) -> String {
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let mut out = String::new();
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for &b in s.as_bytes() {
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match b {
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b'"' => out.push_str("\\22"),
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b'\\' => out.push_str("\\5C"),
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0x20..=0x7E => out.push(b as char),
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_ => out.push_str(&format!("\\{:02X}", b)),
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}
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}
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out.push_str("\\00");
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out
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}
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