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-rw-r--r--src/makefile/input.rs648
1 files changed, 648 insertions, 0 deletions
diff --git a/src/makefile/input.rs b/src/makefile/input.rs
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+++ b/src/makefile/input.rs
@@ -0,0 +1,648 @@
+use std::cell::{Cell, RefCell};
+use std::collections::HashMap;
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+use std::iter::Peekable;
+use std::path::Path;
+use std::rc::Rc;
+
+use eyre::{bail, eyre, Context, Result};
+use lazy_static::lazy_static;
+use regex::Regex;
+
+use crate::args::Args;
+
+use super::command_line::CommandLine;
+#[cfg(feature = "full")]
+use super::conditional::{Line as ConditionalLine, State as ConditionalState};
+use super::inference_rules::InferenceRule;
+use super::r#macro::{Set as MacroSet, Source as MacroSource};
+use super::target::Target;
+use super::token::{tokenize, Token, TokenString};
+
+enum LineType {
+ Rule,
+ Macro,
+ Unknown,
+}
+
+impl LineType {
+ fn of(line_tokens: &TokenString) -> Self {
+ #[cfg(feature = "full")]
+ if line_tokens.starts_with("define ") {
+ return Self::Macro;
+ }
+ for token in line_tokens.tokens() {
+ if let Token::Text(text) = token {
+ let colon_idx = text.find(':');
+ #[cfg(not(feature = "full"))]
+ let equals_idx = text.find('=');
+ #[cfg(feature = "full")]
+ let equals_idx = ["=", ":=", "::=", "?=", "+="]
+ .iter()
+ .filter_map(|p| text.find(p))
+ .min();
+ match (colon_idx, equals_idx) {
+ (Some(_), None) => {
+ return Self::Rule;
+ }
+ (Some(c), Some(e)) if c < e => {
+ return Self::Rule;
+ }
+ (None, Some(_)) => {
+ return Self::Macro;
+ }
+ (Some(c), Some(e)) if e <= c => {
+ return Self::Macro;
+ }
+ _ => {}
+ }
+ }
+ }
+ Self::Unknown
+ }
+}
+
+fn inference_match<'a>(
+ targets: &[&'a str],
+ prerequisites: &[String],
+) -> Option<regex::Captures<'a>> {
+ lazy_static! {
+ static ref INFERENCE_RULE: Regex =
+ Regex::new(r"^(?P<s2>(\.[^/.]+)?)(?P<s1>\.[^/.]+)$").unwrap();
+ static ref SPECIAL_TARGET: Regex = Regex::new(r"^\.[A-Z]+$").unwrap();
+ }
+
+ let inference_match = INFERENCE_RULE.captures(targets[0]);
+ let special_target_match = SPECIAL_TARGET.captures(targets[0]);
+
+ let inference_rule = targets.len() == 1
+ && prerequisites.is_empty()
+ && inference_match.is_some()
+ && special_target_match.is_none();
+ if inference_rule {
+ inference_match
+ } else {
+ None
+ }
+}
+
+pub struct MakefileReader<'a> {
+ inference_rules: Vec<InferenceRule>,
+ macros: MacroSet<'static, 'static>,
+ targets: RefCell<HashMap<String, Rc<RefCell<Target>>>>,
+ pub first_non_special_target: Option<String>,
+ args: &'a Args,
+ // TODO borrow warnings from Python version
+}
+
+impl<'a> MakefileReader<'a> {
+ pub fn new(args: &'a Args) -> Self {
+ let mut inference_rules = vec![];
+ let mut macros = MacroSet::new();
+ let mut targets = HashMap::new();
+ let first_non_special_target = None;
+
+ if !args.no_builtin_rules {
+ inference_rules.extend(builtin_inference_rules());
+ macros.add_builtins();
+ targets.extend(
+ builtin_targets()
+ .into_iter()
+ .map(|t| (t.name.clone(), Rc::new(RefCell::new(t)))),
+ );
+ }
+
+ macros.add_env();
+
+ for r#macro in args.macros() {
+ if let [name, value] = *r#macro.splitn(2, '=').collect::<Vec<_>>() {
+ macros.set(
+ name.into(),
+ MacroSource::CommandLineOrMakeflags,
+ TokenString::text(value),
+ );
+ }
+ }
+
+ MakefileReader {
+ inference_rules,
+ macros,
+ targets: RefCell::new(targets),
+ first_non_special_target,
+ args,
+ }
+ }
+
+ pub fn and_read_file(&mut self, path: impl AsRef<Path>) -> Result<()> {
+ let file = File::open(path);
+ // TODO handle errors
+ let file = file.context("couldn't open makefile!")?;
+ let file_reader = BufReader::new(file);
+ self.and_read(file_reader)
+ }
+
+ pub fn and_read(&mut self, source: impl BufRead) -> Result<()> {
+ let mut lines_iter = source
+ .lines()
+ .enumerate()
+ .map(|(number, line)| (number.saturating_add(1), line))
+ .map(|(line, x)| {
+ (
+ line,
+ x.with_context(|| format!("failed to read line {} of makefile", line)),
+ )
+ })
+ .peekable();
+ #[cfg(feature = "full")]
+ let mut conditional_stack: Vec<ConditionalState> = vec![];
+ while let Some((line_number, line)) = lines_iter.next() {
+ let mut line = line?;
+
+ // handle escaped newlines
+ while line.ends_with('\\') {
+ line.pop();
+ line.push(' ');
+ if let Some((_, x)) = lines_iter.next() {
+ line.push_str(x?.trim_start())
+ }
+ }
+
+ // handle comments
+ lazy_static! {
+ static ref COMMENT: Regex = Regex::new("#.*$").unwrap();
+ }
+ let line = COMMENT.replace(&line, "").into_owned();
+
+ #[cfg(feature = "full")]
+ if let Some(line) = ConditionalLine::from(&line, |t| self.expand_macros(t))? {
+ line.action(
+ conditional_stack.last(),
+ |name| self.macros.is_defined(name),
+ |t| self.expand_macros(t),
+ )?
+ .apply_to(&mut conditional_stack);
+ continue;
+ }
+
+ // skip lines if we need to
+ #[cfg(feature = "full")]
+ if conditional_stack
+ .last()
+ .map_or(false, ConditionalState::skipping)
+ {
+ continue;
+ }
+
+ // handle include lines
+ if let Some(line) = line.strip_prefix("include ") {
+ // remove extra leading space
+ let line = line.trim_start();
+ let line = self.expand_macros(&tokenize(line)?)?;
+ let fields = line.split_whitespace();
+ // POSIX says we only have to handle a single filename, but GNU make
+ // handles arbitrarily many filenames, and it's not like that's more work
+ for field in fields {
+ self.and_read_file(field)?;
+ }
+ continue;
+ }
+
+ if line.trim().is_empty() {
+ // handle blank lines
+ continue;
+ }
+ // unfortunately, rules vs macros can't be determined until after
+ // macro tokenizing. so that's suboptimal.
+
+ // TODO errors
+ let line_tokens: TokenString = line
+ .parse()
+ .with_context(|| format!("failed to parse line {}", line_number))?;
+
+ let line_type = LineType::of(&line_tokens);
+
+ // before we actually test it, see if it's only visible after expanding macros
+ let (line_tokens, line_type) = if let LineType::Unknown = line_type {
+ let line_tokens = TokenString::text(self.expand_macros(&line_tokens)?);
+ let line_type = LineType::of(&line_tokens);
+ (line_tokens, line_type)
+ } else {
+ (line_tokens, line_type)
+ };
+
+ match line_type {
+ LineType::Rule => self.read_rule(&line_tokens, line_number, &mut lines_iter)?,
+ LineType::Macro => self.read_macro(line_tokens, line_number, &mut lines_iter)?,
+ LineType::Unknown => {
+ if !line_tokens.is_empty() {
+ bail!(
+ "error: line {}: unknown line \"{}\"",
+ line_number,
+ line_tokens
+ );
+ }
+ }
+ }
+ }
+
+ Ok(())
+ }
+
+ fn read_rule(
+ &mut self,
+ line_tokens: &TokenString,
+ line_number: usize,
+ lines_iter: &mut Peekable<impl Iterator<Item = (usize, Result<String>)>>,
+ ) -> Result<()> {
+ let (targets, not_targets) = line_tokens
+ .split_once(':')
+ .ok_or_else(|| eyre!("read_rule couldn't find a ':' on line {}", line_number))?;
+ let targets = self.expand_macros(&targets)?;
+ let targets = targets.split_whitespace().collect::<Vec<_>>();
+ let (prerequisites, mut commands) = match not_targets.split_once(';') {
+ Some((prerequisites, mut command)) => {
+ while command.ends_with("\\") {
+ if let Some((_, next_line)) = lines_iter.next() {
+ command.strip_suffix("\\");
+ command.extend(tokenize(&next_line?)?);
+ } else {
+ break;
+ }
+ }
+ (prerequisites, vec![command])
+ }
+ None => (not_targets, vec![]),
+ };
+ let prerequisites = self.expand_macros(&prerequisites)?;
+ let prerequisites = prerequisites
+ .split_whitespace()
+ .map(|x| x.into())
+ .collect::<Vec<String>>();
+
+ while let Some((_, x)) = lines_iter.next_if(|(_, x)| {
+ x.as_ref()
+ .ok()
+ .map_or(false, |line| line.starts_with('\t') || line.is_empty())
+ }) {
+ let mut line = x?;
+ if !line.is_empty() {
+ line.remove(0);
+ }
+ if line.is_empty() {
+ continue;
+ }
+ while line.ends_with('\\') {
+ match lines_iter.next() {
+ Some((_, Ok(next_line))) => {
+ let next_line = next_line.strip_prefix("\t").unwrap_or(&next_line);
+ line.push('\n');
+ line.push_str(next_line);
+ }
+ _ => break,
+ }
+ }
+ commands.push(
+ line.parse()
+ .with_context(|| format!("failed to parse line {}", line_number))?,
+ );
+ }
+
+ let commands = commands
+ .into_iter()
+ .map(CommandLine::from)
+ .collect::<Vec<_>>();
+
+ if targets.is_empty() {
+ return Ok(());
+ }
+
+ // we don't know yet if it's a target rule or an inference rule
+ let inference_match = inference_match(&targets, &prerequisites);
+
+ if let Some(inference_match) = inference_match {
+ let new_rule = InferenceRule {
+ product: inference_match.name("s1").unwrap().as_str().to_owned(),
+ prereq: inference_match.name("s2").unwrap().as_str().to_owned(),
+ commands,
+ };
+
+ self.inference_rules.retain(|existing_rule| {
+ (&existing_rule.prereq, &existing_rule.product)
+ != (&new_rule.prereq, &new_rule.product)
+ });
+ self.inference_rules.push(new_rule);
+ } else {
+ for target in targets {
+ if self.first_non_special_target.is_none() && !target.starts_with('.') {
+ self.first_non_special_target = Some(target.into());
+ }
+ let mut targets = self.targets.borrow_mut();
+ match targets.get_mut(target) {
+ Some(old_target)
+ if commands.is_empty()
+ && !(target == ".SUFIXES" && prerequisites.is_empty()) =>
+ {
+ let mut old_target = old_target.borrow_mut();
+ let new_prerequisites = prerequisites
+ .iter()
+ .filter(|x| !old_target.prerequisites.contains(x))
+ .cloned()
+ .collect::<Vec<_>>();
+ old_target.prerequisites.extend(new_prerequisites);
+ }
+ _ => {
+ let new_target = Target {
+ name: target.into(),
+ prerequisites: prerequisites.clone(),
+ commands: commands.clone(),
+ already_updated: Cell::new(false),
+ };
+ targets.insert(target.into(), Rc::new(RefCell::new(new_target)));
+ }
+ }
+ }
+ }
+
+ Ok(())
+ }
+
+ fn read_macro(
+ &mut self,
+ mut line_tokens: TokenString,
+ line_number: usize,
+ lines_iter: &mut Peekable<impl Iterator<Item = (usize, Result<String>)>>,
+ ) -> Result<()> {
+ let (name, mut value) = if cfg!(feature = "full") && line_tokens.starts_with("define ") {
+ line_tokens.strip_prefix("define ");
+ if line_tokens.ends_with("=") {
+ line_tokens.strip_suffix("=");
+ line_tokens.trim_end();
+ }
+ let mut value = TokenString::empty();
+ for (_, line) in lines_iter {
+ let line = line?;
+ if line == "endef" {
+ break;
+ }
+ if !value.is_empty() {
+ value.extend(TokenString::text("\n"));
+ }
+ value.extend(line.parse()?);
+ }
+ (line_tokens, value)
+ } else {
+ line_tokens
+ .split_once('=')
+ .ok_or_else(|| eyre!("read_rule couldn't find a ':' on line {}", line_number))?
+ };
+ let name = self.expand_macros(&name)?;
+ // GNUisms are annoying, but popular
+ let mut expand_value = false;
+ let mut skip_if_defined = false;
+ let mut append = false;
+
+ #[cfg(feature = "full")]
+ let name = if let Some(real_name) = name.strip_suffix("::") {
+ expand_value = true;
+ real_name
+ } else if let Some(real_name) = name.strip_suffix(":") {
+ expand_value = true;
+ real_name
+ } else if let Some(real_name) = name.strip_suffix("?") {
+ skip_if_defined = true;
+ real_name
+ } else if let Some(real_name) = name.strip_suffix("+") {
+ append = true;
+ real_name
+ } else {
+ &name
+ };
+
+ let name = name.trim_end();
+ value.trim_start();
+
+ let value = if expand_value {
+ TokenString::text(self.expand_macros(&value)?)
+ } else {
+ value
+ };
+
+ match self.macros.get(name) {
+ // We always let command line or MAKEFLAGS macros override macros from the file.
+ Some((MacroSource::CommandLineOrMakeflags, _)) => return Ok(()),
+ // We let environment variables override macros from the file only if the command-line argument to do that was given
+ Some((MacroSource::Environment, _)) if self.args.environment_overrides => return Ok(()),
+ _ if skip_if_defined => return Ok(()),
+ _ => {}
+ }
+
+ let value = match self.macros.pop(name) {
+ Some((_, mut old_value)) if append => {
+ // TODO eagerly expand if appending to eagerly-expanded macro
+ old_value.extend(TokenString::text(" "));
+ old_value.extend(value);
+ old_value
+ }
+ _ => value,
+ };
+ self.macros.set(name.into(), MacroSource::File, value);
+
+ Ok(())
+ }
+
+ fn expand_macros(&self, text: &TokenString) -> Result<String> {
+ self.macros.expand(text)
+ }
+}
+
+impl<'a> From<MakefileReader<'a>> for super::Makefile<'a> {
+ fn from(reader: MakefileReader<'a>) -> Self {
+ Self {
+ inference_rules: reader.inference_rules,
+ macros: reader.macros,
+ targets: reader.targets,
+ first_non_special_target: reader.first_non_special_target,
+ args: reader.args,
+ }
+ }
+}
+
+fn builtin_inference_rules() -> Vec<InferenceRule> {
+ // This is a terrible idea.
+ macro_rules! prepend_dot {
+ ($x:tt) => {
+ concat!(".", stringify!($x))
+ };
+ () => {
+ ""
+ };
+ }
+
+ macro_rules! make {
+ {$(.$first:tt$(.$second:tt)?:
+ $($cmd:literal)+)+} => {
+ vec![$(
+ InferenceRule {
+ product: prepend_dot!($($second)?).into(),
+ prereq: concat!(".", stringify!($first)).into(),
+ commands: vec![$(CommandLine::from($cmd.parse().unwrap())),+],
+ }
+ ),+]
+ };
+ }
+
+ make! {
+ .c:
+ "$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $<"
+ .f:
+ "$(FC) $(FFLAGS) $(LDFLAGS) -o $@ $<"
+ .sh:
+ "cp $< $@"
+ "chmod a+x $@"
+
+ .c.o:
+ "$(CC) $(CFLAGS) -c $<"
+ .f.o:
+ "$(FC) $(FFLAGS) -c $<"
+ .y.o:
+ "$(YACC) $(YFLAGS) $<"
+ "$(CC) $(CFLAGS) -c y.tab.c"
+ "rm -f y.tab.c"
+ "mv y.tab.o $@"
+ .l.o:
+ "$(LEX) $(LFLAGS) $<"
+ "$(CC) $(CFLAGS) -c lex.yy.c"
+ "rm -f lex.yy.c"
+ "mv lex.yy.o $@"
+ .y.c:
+ "$(YACC) $(YFLAGS) $<"
+ "mv y.tab.c $@"
+ .l.c:
+ "$(LEX) $(LFLAGS) $<"
+ "mv lex.yy.c $@"
+ .c.a:
+ "$(CC) -c $(CFLAGS) $<"
+ "$(AR) $(ARFLAGS) $@ $*.o"
+ "rm -f $*.o"
+ .f.a:
+ "$(FC) -c $(FFLAGS) $<"
+ "$(AR) $(ARFLAGS) $@ $*.o"
+ "rm -f $*.o"
+ }
+}
+fn builtin_targets() -> Vec<Target> {
+ // even i'm not going to do that just for this
+ vec![Target {
+ name: ".SUFFIXES".into(),
+ prerequisites: vec![".o", ".c", ".y", ".l", ".a", ".sh", ".f"]
+ .into_iter()
+ .map(String::from)
+ .collect(),
+ commands: vec![],
+ already_updated: Cell::new(false),
+ }]
+}
+
+#[cfg(test)]
+mod test {
+ use std::io::Cursor;
+
+ use super::*;
+
+ type R = Result<()>;
+
+ fn empty_makefile(args: &Args) -> MakefileReader {
+ MakefileReader {
+ inference_rules: vec![],
+ macros: MacroSet::new(),
+ targets: RefCell::new(HashMap::new()),
+ first_non_special_target: None,
+ args,
+ }
+ }
+
+ #[cfg(feature = "full")]
+ #[test]
+ fn basic_conditionals() -> R {
+ let file = "
+ifeq (1,1)
+worked = yes
+else ifeq (2,2)
+worked = no
+else
+worked = perhaps
+endif
+ ";
+ let args = Args::empty();
+ let mut makefile = empty_makefile(&args);
+ makefile.and_read(Cursor::new(file))?;
+ assert_eq!(
+ makefile.expand_macros(&TokenString::r#macro("worked"))?,
+ "yes"
+ );
+ Ok(())
+ }
+
+ #[cfg(feature = "full")]
+ #[test]
+ fn define_syntax() -> R {
+ let file = "
+define foo =
+bar
+baz
+endef
+ ";
+ let args = Args::empty();
+ let mut makefile = empty_makefile(&args);
+ makefile.and_read(Cursor::new(file))?;
+ assert_eq!(
+ makefile.expand_macros(&TokenString::r#macro("foo"))?,
+ "bar\nbaz"
+ );
+ Ok(())
+ }
+
+ #[test]
+ #[ignore = "I still haven't implemented `eval` or %-based macro substitution."]
+ fn eval() -> R {
+ // This, for the record, is a terrible misfeature.
+ // If you need this, you probably shouldn't be using Make.
+ // But a lot of people are using this and still use Make anyway, so here we go,
+ // I guess.
+
+ let file = "
+PROGRAMS = server client
+
+server_OBJS = server.o server_priv.o server_access.o
+server_LIBS = priv protocol
+
+client_OBJS = client.o client_api.o client_mem.o
+client_LIBS = protocol
+
+# Everything after this is generic
+
+.PHONY: all
+all: $(PROGRAMS)
+
+define PROGRAM_template =
+ $(1): $$($(1)_OBJS) $$($(1)_LIBS:%=-l%)
+ ALL_OBJS += $$($(1)_OBJS)
+endef
+
+$(foreach prog,$(PROGRAMS),$(eval $(call PROGRAM_template,$(prog))))
+
+$(PROGRAMS):
+ $(LINK.o) $^ $(LDLIBS) -o $@
+
+clean:
+ rm -f $(ALL_OBJS) $(PROGRAMS)
+ ";
+
+ let args = Args::empty();
+ let mut makefile = empty_makefile(&args);
+ makefile.and_read(Cursor::new(file))?;
+ assert!(makefile.targets.borrow().contains_key("server"));
+ Ok(())
+ }
+}
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