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compile_bytecode.rs
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360 lines (331 loc) · 12.5 KB
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//! Parsing and processing for this form:
//! ```ignore
//! py_compile!(
//! // either:
//! source = "python_source_code",
//! // or
//! file = "file/path/relative/to/$CARGO_MANIFEST_DIR",
//!
//! // the mode to compile the code in
//! mode = "exec", // or "eval" or "single"
//! // the path put into the CodeObject, defaults to "frozen"
//! module_name = "frozen",
//! )
//! ```
use crate::{extract_spans, Diagnostic};
use once_cell::sync::Lazy;
use proc_macro2::{Span, TokenStream as TokenStream2};
use quote::quote;
use rustpython_bytecode::{CodeObject, FrozenModule};
use rustpython_compiler as compile;
use std::collections::HashMap;
use std::env;
use std::fs;
use std::path::{Path, PathBuf};
use syn::parse::{Parse, ParseStream, Result as ParseResult};
use syn::spanned::Spanned;
use syn::{self, parse2, Lit, LitByteStr, LitStr, Macro, Meta, MetaNameValue, Token};
static CARGO_MANIFEST_DIR: Lazy<PathBuf> = Lazy::new(|| {
PathBuf::from(env::var_os("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR is not present"))
});
enum CompilationSourceKind {
File(PathBuf),
SourceCode(String),
Dir(PathBuf),
}
struct CompilationSource {
kind: CompilationSourceKind,
span: (Span, Span),
}
impl CompilationSource {
fn compile_string<D: std::fmt::Display, F: FnOnce() -> D>(
&self,
source: &str,
mode: compile::Mode,
module_name: String,
origin: F,
) -> Result<CodeObject, Diagnostic> {
compile::compile(source, mode, module_name, compile::CompileOpts::default()).map_err(
|err| {
Diagnostic::spans_error(
self.span,
format!("Python compile error from {}: {}", origin(), err),
)
},
)
}
fn compile(
&self,
mode: compile::Mode,
module_name: String,
) -> Result<HashMap<String, FrozenModule>, Diagnostic> {
match &self.kind {
CompilationSourceKind::Dir(rel_path) => {
self.compile_dir(&CARGO_MANIFEST_DIR.join(rel_path), String::new(), mode)
}
_ => Ok(hashmap! {
module_name.clone() => FrozenModule {
code: self.compile_single(mode, module_name)?,
package: false,
},
}),
}
}
fn compile_single(
&self,
mode: compile::Mode,
module_name: String,
) -> Result<CodeObject, Diagnostic> {
match &self.kind {
CompilationSourceKind::File(rel_path) => {
let path = CARGO_MANIFEST_DIR.join(rel_path);
let source = fs::read_to_string(&path).map_err(|err| {
Diagnostic::spans_error(
self.span,
format!("Error reading file {:?}: {}", path, err),
)
})?;
self.compile_string(&source, mode, module_name, || rel_path.display())
}
CompilationSourceKind::SourceCode(code) => {
self.compile_string(&textwrap::dedent(code), mode, module_name, || {
"string literal"
})
}
CompilationSourceKind::Dir(_) => {
unreachable!("Can't use compile_single with directory source")
}
}
}
fn compile_dir(
&self,
path: &Path,
parent: String,
mode: compile::Mode,
) -> Result<HashMap<String, FrozenModule>, Diagnostic> {
let mut code_map = HashMap::new();
let paths = fs::read_dir(&path).map_err(|err| {
Diagnostic::spans_error(self.span, format!("Error listing dir {:?}: {}", path, err))
})?;
for path in paths {
let path = path.map_err(|err| {
Diagnostic::spans_error(self.span, format!("Failed to list file: {}", err))
})?;
let path = path.path();
let file_name = path.file_name().unwrap().to_str().ok_or_else(|| {
Diagnostic::spans_error(self.span, format!("Invalid UTF-8 in file name {:?}", path))
})?;
if path.is_dir() {
code_map.extend(self.compile_dir(
&path,
format!("{}{}", parent, file_name),
mode,
)?);
} else if file_name.ends_with(".py") {
let source = fs::read_to_string(&path).map_err(|err| {
Diagnostic::spans_error(
self.span,
format!("Error reading file {:?}: {}", path, err),
)
})?;
let stem = path.file_stem().unwrap().to_str().unwrap();
let is_init = stem == "__init__";
let module_name = if is_init {
parent.clone()
} else if parent.is_empty() {
stem.to_owned()
} else {
format!("{}.{}", parent, stem)
};
code_map.insert(
module_name.clone(),
FrozenModule {
code: self.compile_string(&source, mode, module_name, || {
path.strip_prefix(&*CARGO_MANIFEST_DIR)
.ok()
.unwrap_or(&path)
.display()
})?,
package: is_init,
},
);
}
}
Ok(code_map)
}
}
/// This is essentially just a comma-separated list of Meta nodes, aka the inside of a MetaList.
struct PyCompileInput {
span: Span,
metas: Vec<Meta>,
}
impl PyCompileInput {
fn parse(&self, allow_dir: bool) -> Result<PyCompileArgs, Diagnostic> {
let mut module_name = None;
let mut mode = None;
let mut source: Option<CompilationSource> = None;
let mut crate_name = None;
fn assert_source_empty(source: &Option<CompilationSource>) -> Result<(), Diagnostic> {
if let Some(source) = source {
Err(Diagnostic::spans_error(
source.span,
"Cannot have more than one source",
))
} else {
Ok(())
}
}
for meta in &self.metas {
if let Meta::NameValue(name_value) = meta {
let ident = match name_value.path.get_ident() {
Some(ident) => ident,
None => continue,
};
if ident == "mode" {
match &name_value.lit {
Lit::Str(s) => match s.value().parse() {
Ok(mode_val) => mode = Some(mode_val),
Err(e) => bail_span!(s, "{}", e),
},
_ => bail_span!(name_value.lit, "mode must be a string"),
}
} else if ident == "module_name" {
module_name = Some(match &name_value.lit {
Lit::Str(s) => s.value(),
_ => bail_span!(name_value.lit, "module_name must be string"),
})
} else if ident == "source" {
assert_source_empty(&source)?;
let code = match &name_value.lit {
Lit::Str(s) => s.value(),
_ => bail_span!(name_value.lit, "source must be a string"),
};
source = Some(CompilationSource {
kind: CompilationSourceKind::SourceCode(code),
span: extract_spans(&name_value).unwrap(),
});
} else if ident == "file" {
assert_source_empty(&source)?;
let path = match &name_value.lit {
Lit::Str(s) => PathBuf::from(s.value()),
_ => bail_span!(name_value.lit, "source must be a string"),
};
<
B5E8
div>
source = Some(CompilationSource {
kind: CompilationSourceKind::File(path),
span: extract_spans(&name_value).unwrap(),
});
} else if ident == "dir" {
if !allow_dir {
bail_span!(ident, "py_compile doesn't accept dir")
}
assert_source_empty(&source)?;
let path = match &name_value.lit {
Lit::Str(s) => PathBuf::from(s.value()),
_ => bail_span!(name_value.lit, "source must be a string"),
};
source = Some(CompilationSource {
kind: CompilationSourceKind::Dir(path),
span: extract_spans(&name_value).unwrap(),
});
} else if ident == "crate_name" {
let name = match &name_value.lit {
Lit::Str(s) => s.parse()?,
_ => bail_span!(name_value.lit, "source must be a string"),
};
crate_name = Some(name);
}
}
}
let source = source.ok_or_else(|| {
Diagnostic::span_error(
self.span,
"Must have either file or source in py_compile!()/py_freeze!()",
)
})?;
Ok(PyCompileArgs {
source,
mode: mode.unwrap_or(compile::Mode::Exec),
module_name: module_name.unwrap_or_else(|| "frozen".to_owned()),
crate_name: crate_name.unwrap_or_else(|| syn::parse_quote!(::rustpython_vm::bytecode)),
})
}
}
fn parse_meta(input: ParseStream) -> ParseResult<Meta> {
let path = input.call(syn::Path::parse_mod_style)?;
let eq_token: Token![=] = input.parse()?;
let span = input.span();
if input.peek(LitStr) {
Ok(Meta::NameValue(MetaNameValue {
path,
eq_token,
lit: Lit::Str(input.parse()?),
}))
} else if let Ok(mac) = input.parse::<Macro>() {
Ok(Meta::NameValue(MetaNameValue {
path,
eq_token,
lit: Lit::Str(LitStr::new(&mac.tokens.to_string(), mac.span())),
}))
} else {
Err(syn::Error::new(span, "Expected string or stringify macro"))
}
}
impl Parse for PyCompileInput {
fn parse(input: ParseStream) -> ParseResult<Self> {
let span = input.cursor().span();
let metas = input
.parse_terminated::<Meta, Token![,]>(parse_meta)?
.into_iter()
.collect();
Ok(PyCompileInput { span, metas })
}
}
struct PyCompileArgs {
source: CompilationSource,
mode: compile::Mode,
module_name: String,
crate_name: syn::Path,
}
pub fn impl_py_compile(input: TokenStream2) -> Result<TokenStream2, Diagnostic> {
let input: PyCompileInput = parse2(input)?;
let args = input.parse(false)?;
let crate_name = args.crate_name;
let code = args.source.compile_single(args.mode, args.module_name)?;
let bytes = code.to_bytes();
let bytes = LitByteStr::new(&bytes, Span::call_site());
let output = quote! {
#crate_name::CodeObject::from_bytes(#bytes)
.expect("Deserializing CodeObject failed")
};
Ok(output)
}
pub fn impl_py_freeze(input: TokenStream2) -> Result<TokenStream2, Diagnostic> {
let input: PyCompileInput = parse2(input)?;
let args = input.parse(true)?;
let crate_name = args.crate_name;
let code_map = args.source.compile(args.mode, args.module_name)?;
let modules_len = code_map.len();
let modules = code_map
.into_iter()
.map(|(module_name, FrozenModule { code, package })| {
let module_name = LitStr::new(&module_name, Span::call_site());
let bytes = code.to_bytes();
let bytes = LitByteStr::new(&bytes, Span::call_site());
quote! {
m.insert(#module_name.into(), #crate_name::FrozenModule {
code: #crate_name::CodeObject::from_bytes(
#bytes
).expect("Deserializing CodeObject failed"),
package: #package,
});
}
});
let output = quote! {
{
let mut m = ::std::collections::HashMap::with_capacity(#modules_len);
#(#modules)*
m
}
};
Ok(output)
}