WIP

src/common.rs

@@ -2,12 +2,10 @@ mod lazy;
 mod output;
 mod relocatable;
 mod section;
-mod storage;
 mod symbol;
 
 pub use lazy::*;
 pub use output::*;
 pub use relocatable::*;
 pub use section::*;
-pub use storage::*;
 pub use symbol::*;

src/common/output.rs

@@ -4,9 +4,7 @@ use super::Section;
 use crate::error::Error;
 
 pub trait Output<'data> {
-    fn append_section(&mut self, section: Section<'data>) -> Result<(), Error>;
-
-    // fn prepare_symbol<V, S>(&mut self, symbol: impl Lazy<V, S>) -> Result<&mut Self, Error>;
+    fn process_section(&mut self, section: Section<'data>) -> Result<(), Error>;
 
     fn finalize(self) -> Result<PathBuf, Error>;
 }
@@ -14,7 +12,7 @@ pub trait Output<'data> {
 pub struct DummyOutput;
 
 impl<'data> Output<'data> for DummyOutput {
-    fn append_section(&mut self, section: Section<'data>) -> Result<(), Error> {
+    fn process_section(&mut self, section: Section<'data>) -> Result<(), Error> {
         eprintln!("Appending section: {}", section);
         Ok(())
     }

src/common/relocatable.rs

@@ -1,15 +1,15 @@
-use std::fmt::Display;
 use std::path::Path;
+use std::{convert::TryFrom, fmt::Display, path::PathBuf};
 
 use crate::error::Error;
 
 use super::Section;
 
-pub type BSI<'data> = Box<dyn Iterator<Item = Result<Section<'data>, Error>> + 'data>;
+pub type BSI<'iter, 'data> = Box<dyn Iterator<Item = Result<Section<'data>, Error>> + 'iter>;
 /// Contains all the needed getters to construct a final
 /// mushed and relocated executable from an object file
-pub trait Relocatable: Display {
+pub trait Relocatable<'data>: Display + TryFrom<PathBuf, Error = Error> {
     fn origin(&self) -> &Path; // not same as section's path since this one's supposed to be cannonical
 
-    fn sections(&self) -> BSI<'_>;
+    fn sections<'sections>(self: &'sections Self) -> BSI<'sections, 'data>;
 }

src/common/storage.rs

@@ -1,45 +0,0 @@
-use std::path::PathBuf;
-use std::{fs::canonicalize, io::ErrorKind};
-
-use crate::error::Error;
-
-pub struct Storage {
-    origin: PathBuf,
-    bytes: Vec<u8>, // for storing the total if needed
-}
-
-impl Storage {
-    pub fn new(origin: PathBuf) -> Self {
-        Self {
-            origin,
-            bytes: Vec::new(),
-        }
-    }
-
-    pub fn origin(&self) -> Result<PathBuf, Error> {
-        canonicalize(&self.origin).map_err(|e| e.into())
-    }
-
-    pub fn destination(&self) -> Result<PathBuf, Error> {
-        let mut dest = canonicalize(&self.origin)?;
-        if !dest.pop() {
-            let err = std::io::Error::new(ErrorKind::Other, "Destination path invalid");
-            Err(Error::IOError(Box::new(err)))
-        } else {
-            dest.push("rld.out");
-            Ok(dest)
-        }
-    }
-
-    pub fn iter(&mut self) -> Result<impl Iterator<Item = &u8>, Error> {
-        self.bytes = std::fs::read(&self.origin)?;
-
-        Ok(self.bytes.iter())
-    }
-
-    pub fn bytes(&mut self) -> Result<&[u8], Error> {
-        self.bytes = std::fs::read(&self.origin)?;
-
-        Ok(&self.bytes)
-    }
-}

src/formats/elf.rs

@@ -1,3 +1,5 @@
+use std::path::PathBuf;
+
 use crate::common::{Lazy, Symbol};
 use crate::error::Error;
 use crate::linker::Linker;
@@ -10,10 +12,10 @@ use elf_utilities::file::ELF64;
 pub use object::*;
 pub use output::*;
 
-impl Linker<'_> {
+impl<'data> Linker<'data, ElfObject, ElfOutput<'data>> {
     // shortcut to avoid turbofish
-    pub fn elf() -> Self {
-        Self::new(Vec::new())
+    pub fn elf(destination: PathBuf) -> Result<Self, Error> {
+        Ok(Self::new(ElfOutput::new(destination)?))
     }
 }
 

src/formats/elf/object.rs

@@ -1,10 +1,6 @@
-use std::{
-    convert::TryFrom,
-    fmt::Display,
-    path::{Path, PathBuf},
-};
+use std::{convert::TryFrom, fmt::Display, path::{Path, PathBuf}};
 
-use crate::common::{Relocatable, Section, SectionInfo, Storage};
+use crate::common::{Relocatable, Section, SectionInfo};
 use crate::{common::BSI, error::Error};
 use elf_utilities::{file::ELF64, parser::read_elf64};
 
@@ -14,8 +10,7 @@ pub struct ElfObject {
 }
 
 impl ElfObject {
-    pub fn new(storage: &mut Storage) -> Result<Self, Error> {
-        let origin = storage.origin()?;
+    pub fn new(origin: PathBuf) -> Result<Self, Error> {
         let str_origin = origin
             .as_path()
             .to_str()
@@ -36,12 +31,12 @@ impl ElfObject {
     }
 }
 
-impl Relocatable for ElfObject {
+impl<'data> Relocatable<'data> for ElfObject {
     fn origin(&self) -> &Path {
         &self.origin
     }
 
-    fn sections(&self) -> BSI<'_> {
+    fn sections<'sections>(self: &'sections Self) -> BSI<'sections, 'data> {
         use elf_utilities::section::{Contents64, Type};
 
         let iter = self
@@ -104,6 +99,14 @@ impl Display for ElfObject {
     }
 }
 
+impl TryFrom<PathBuf> for ElfObject {
+    type Error = Error;
+
+    fn try_from(path: PathBuf) -> Result<Self, Self::Error> {
+        Self::new(path)
+    }
+}
+
 fn is_relocatable(elf: &ELF64) -> Result<(), Error> {
     use elf_utilities::header::Type;
 

src/formats/elf/output.rs

@@ -25,7 +25,7 @@ use super::ElfObject;
 pub struct ElfOutput<'data> {
     destination: PathBuf,
     file: ELF64,
-    input_data: InputData<'data>,
+    input_data: OutputData<'data>,
     writer: BufWriter<File>,
 }
 
@@ -48,7 +48,7 @@ impl<'data> ElfOutput<'data> {
         let result = Self {
             destination,
             file: elf,
-            input_data: InputData::new(),
+            input_data: OutputData::new(),
             writer,
         };
 
@@ -64,7 +64,7 @@ impl<'data> ElfOutput<'data> {
         let result = Self {
             destination,
             file: elf_bin_from_object(other),
-            input_data: InputData::new(),
+            input_data: OutputData::new(),
             writer,
         };
 
@@ -153,11 +153,7 @@ impl<'data> ElfOutput<'data> {
             SegmentType::Text,
         );
         // contains .data as one segment
-        self.populate_segment(
-            &mut offset,
-            self.input_data.data_size(),
-            SegmentType::Data,
-        );
+        self.populate_segment(&mut offset, self.input_data.data_size(), SegmentType::Data);
         // contains .bss as one segment
         self.populate_segment(&mut offset, self.input_data.bss_size(), SegmentType::Bss);
 
@@ -166,7 +162,7 @@ impl<'data> ElfOutput<'data> {
 }
 
 impl<'data> Output<'data> for ElfOutput<'data> {
-    fn append_section(&mut self, section: Section<'data>) -> Result<(), Error> {
+    fn process_section(&mut self, section: Section<'data>) -> Result<(), Error> {
         self.input_data.append_section(section)
     }
 
@@ -183,7 +179,8 @@ impl<'data> Output<'data> for ElfOutput<'data> {
         self.file.ehdr.e_phentsize = PHS;
         self.file.ehdr.e_shentsize = SHS;
         self.file.ehdr.e_phoff = EHS;
-        self.file.ehdr.e_shoff = self.file.ehdr.e_phoff + (usize::from(self.file.ehdr.e_phentsize) * self.file.segments.len()) as u64;
+        self.file.ehdr.e_shoff = self.file.ehdr.e_phoff
+            + (usize::from(self.file.ehdr.e_phentsize) * self.file.segments.len()) as u64;
 
         let mut offset = 0;
 

src/formats/elf/segment.rs

@@ -1,5 +1,5 @@
+use crate::common::Section;
 use crate::common::SectionInfo;
-use crate::common::{Section};
 use crate::error::Error;
 
 const SI_TEXT: usize = 0;
@@ -15,9 +15,9 @@ pub enum SegmentType {
 
 const SEGMENT_NAMES: [&str; 4] = [".text", ".rodata", ".data", ".bss"];
 
-pub struct InputData<'data>([Vec<SectionInfo<'data>>; 4]);
+pub struct OutputData<'data>([Vec<SectionInfo<'data>>; 4]);
 
-impl<'data> InputData<'data> {
+impl<'data> OutputData<'data> {
     pub fn new() -> Self {
         Self([Vec::new(), Vec::new(), Vec::new(), Vec::new()])
     }
@@ -90,7 +90,7 @@ impl<'data> InputData<'data> {
     }
 }
 
-impl Default for InputData<'_> {
+impl Default for OutputData<'_> {
     fn default() -> Self {
         Self::new()
     }

src/linker.rs

@@ -1,35 +1,66 @@
-use std::fmt::Display;
+use std::{fmt::Display, io::ErrorKind, marker::PhantomData, path::{Path, PathBuf}};
 
 use crate::{
     common::{Output, Relocatable},
     error::Error,
 };
 
-pub struct Linker<'data> {
-    relocatables: Vec<Box<dyn Relocatable + 'data>>,
+pub struct Linker<'data, R, O>
+where
+    R: Relocatable<'data>,
+    O: Output<'data>,
+{
+    relocatables: Vec<R>,
+    output: O,
+    _p: PhantomData<&'data ()>,
 }
 
-impl<'data> Linker<'data> {
-    pub fn new(relocatables: Vec<Box<dyn Relocatable + 'data>>) -> Self {
-        Self { relocatables }
+impl<'data, R, O> Linker<'data, R, O>
+where
+    R: Relocatable<'data>,
+    O: Output<'data>,
+{
+    pub fn new(output: O) -> Self {
+        Self {
+            relocatables: Vec::new(),
+            output,
+            _p: PhantomData::default(),
         }
+    }
+
+    pub fn add_relocatable(&mut self, path: PathBuf) -> Result<(), Error> {
+        self.relocatables.push(R::try_from(path)?);
 
-    pub fn add_relocatable(&mut self, relocatable: Box<dyn Relocatable + 'data>) {
-        self.relocatables.push(relocatable);
+        Ok(())
     }
 
-    pub fn link(&'data self, output: &mut dyn Output<'data>) -> Result<u64, Error> {
+    pub fn link(&mut self) -> Result<PathBuf, Error> {
         for r in self.relocatables.iter() {
             for s in r.sections() {
-                output.append_section(s?)?;
+                self.output.process_section(s?)?;
             }
         }
 
-        Ok(0)
+        self.output.finalize()
+    }
+
+    pub fn object_path(origin: &Path) -> Result<PathBuf, Error> {
+        let mut dest = std::fs::canonicalize(origin)?;
+        if !dest.pop() {
+            let err = std::io::Error::new(ErrorKind::Other, "Destination path invalid");
+            Err(Error::IOError(Box::new(err)))
+        } else {
+            dest.push("rld.out");
+            Ok(dest)
+        }
     }
 }
 
-impl Display for Linker<'_> {
+impl<'data, R, O> Display for Linker<'data, R, O>
+where
+    R: Relocatable<'data>,
+    O: Output<'data>,
+{
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         writeln!(f, "===Relocatables===")?;
 

src/main.rs

@@ -3,8 +3,8 @@ mod error;
 mod formats;
 mod linker;
 
-use common::{Output, Storage};
-use formats::{ElfObject, ElfOutput};
+use std::path::PathBuf;
+
 use linker::Linker;
 
 fn main() {
@@ -13,31 +13,15 @@ fn main() {
     // can this miss?
     args.next().unwrap();
 
-    let mut contents: Vec<Storage> = Vec::new();
-    let mut linker = Linker::elf();
-    let mut maybe_out = None;
+    let destination = PathBuf::new(); // TODO
+    let mut linker = Linker::elf(destination).expect("Linker init");
 
     while args.peek().is_some() {
-        let fpath = args.next().expect("Unexpected peek-a-boo");
-        let stored = Storage::new(fpath.into());
-        contents.push(stored);
-    }
-
-    for storage in contents.iter_mut() {
-        let relocatable = ElfObject::new(storage).expect("Parsing ELF");
+        let path = PathBuf::from(args.next().expect("Argument expansion"));
 
-        if maybe_out.is_none() {
-            let dest = storage.destination().expect("Path resolution");
-            maybe_out = Some(ElfOutput::from_object(&relocatable, dest).expect("Output file creation"));
-        }
-        linker.add_relocatable(Box::new(relocatable));
+        linker.add_relocatable(path);
     }
 
-    if let Some(mut output) = maybe_out {
-        let linked = linker.link(&mut output).expect("Linking");
-        let outpath = output.finalize().expect("Finalization");
-        eprintln!("Done {:?}, linked {} bytes", outpath, linked);
-    } else {
-        eprintln!("Nothing to do");
-    }
+    let outpath = linker.link().expect("Linking");
+    eprintln!("Done {:?}", outpath);
 }