Make debuginfo parsing optional.

fuzz/fuzz_targets/differential.rs

@@ -2,7 +2,7 @@
 use libfuzzer_sys::{arbitrary, fuzz_target};
 use std::sync::atomic::{AtomicU64, Ordering};
 
-use waffle::Module;
+use waffle::{FrontendOptions, Module};
 
 fn reject(bytes: &[u8]) -> bool {
     let parser = wasmparser::Parser::new(0);
@@ -134,8 +134,9 @@ fuzz_target!(|module: wasm_smith::ConfiguredModule<Config>| {
         }
     };
 
-    let mut parsed_module = Module::from_wasm_bytes(&orig_bytes[..]).unwrap();
+    let mut parsed_module =
-    parsed_module.optimize();
+        Module::from_wasm_bytes(&orig_bytes[..], &FrontendOptions::default()).unwrap();
+    parsed_module.per_func_body(|body| body.optimize());
     let roundtrip_bytes = parsed_module.to_wasm_bytes().unwrap();
 
     if let Ok(filename) = std::env::var("FUZZ_DUMP_WASM") {

fuzz/fuzz_targets/parse_ir.rs

@@ -1,9 +1,10 @@
 #![no_main]
 use libfuzzer_sys::fuzz_target;
 
-use waffle::Module;
+use waffle::{FrontendOptions, Module};
 
 fuzz_target!(|module: wasm_smith::Module| {
     let _ = env_logger::try_init();
-    let _parsed_module = Module::from_wasm_bytes(&module.to_bytes()[..]).unwrap();
+    let _parsed_module =
+        Module::from_wasm_bytes(&module.to_bytes()[..], &FrontendOptions::default()).unwrap();
 });

fuzz/fuzz_targets/roundtrip.rs

@@ -1,13 +1,14 @@
 #![no_main]
 use libfuzzer_sys::fuzz_target;
 
-use waffle::{FrontendError, Module};
+use waffle::{FrontendError, FrontendOptions, Module};
 
 fuzz_target!(|module: wasm_smith::Module| {
     let _ = env_logger::try_init();
     log::debug!("original module: {:?}", module);
     let orig_bytes = module.to_bytes();
-    let mut parsed_module = match Module::from_wasm_bytes(&orig_bytes[..]) {
+    let mut parsed_module =
+        match Module::from_wasm_bytes(&orig_bytes[..], &FrontendOptions::default()) {
             Ok(m) => m,
             Err(e) => {
                 match e.downcast::<FrontendError>() {
@@ -25,6 +26,6 @@ fuzz_target!(|module: wasm_smith::Module| {
             }
         };
     parsed_module.expand_all_funcs().unwrap();
-    parsed_module.optimize();
+    parsed_module.per_func_body(|body| body.optimize());
     let _ = parsed_module.to_wasm_bytes();
 });

fuzz/fuzz_targets/roundtrip_roundtrip.rs

@@ -1,17 +1,19 @@
 #![no_main]
 use libfuzzer_sys::fuzz_target;
 
-use waffle::Module;
+use waffle::{FrontendOptions, Module};
 
 fuzz_target!(|module: wasm_smith::Module| {
     let _ = env_logger::try_init();
     log::debug!("original module: {:?}", module);
     let orig_bytes = module.to_bytes();
-    let parsed_module = Module::from_wasm_bytes(&orig_bytes[..]).unwrap();
+    let parsed_module =
-    let roundtrip_bytes = parsed_module.to_wasm_bytes();
+        Module::from_wasm_bytes(&orig_bytes[..], &FrontendOptions::default()).unwrap();
+    let roundtrip_bytes = parsed_module.to_wasm_bytes().unwrap();
     if let Ok(filename) = std::env::var("ROUNDTRIP_WASM_SAVE") {
         std::fs::write(filename, &roundtrip_bytes[..]).unwrap();
     }
-    let parsed_roundtrip_module = Module::from_wasm_bytes(&roundtrip_bytes[..]).unwrap();
+    let parsed_roundtrip_module =
+        Module::from_wasm_bytes(&roundtrip_bytes[..], &FrontendOptions::default()).unwrap();
     let _ = parsed_roundtrip_module.to_wasm_bytes();
 });

src/bin/waffle-util.rs

@@ -4,7 +4,7 @@ use anyhow::Result;
 use log::debug;
 use std::path::PathBuf;
 use structopt::StructOpt;
-use waffle::Module;
+use waffle::{FrontendOptions, Module};
 
 #[derive(Debug, StructOpt)]
 #[structopt(name = "waffle-util", about = "WAFFLE utility.")]
@@ -18,6 +18,13 @@ struct Options {
     )]
     basic_opts: bool,
 
+    #[structopt(
+        help = "Enable parsing of debug-info from input",
+        short = "g",
+        long = "debug-info"
+    )]
+    debug_info: bool,
+
     #[structopt(help = "Transform to maximal SSA", long = "max-ssa")]
     max_ssa: bool,
 
@@ -61,18 +68,21 @@ fn main() -> Result<()> {
     }
     let _ = logger.try_init();
 
+    let mut options = FrontendOptions::default();
+    options.debug = opts.debug_info;
+
     match &opts.command {
         Command::PrintIR { wasm } => {
             let bytes = std::fs::read(wasm)?;
             debug!("Loaded {} bytes of Wasm data", bytes.len());
-            let mut module = Module::from_wasm_bytes(&bytes[..])?;
+            let mut module = Module::from_wasm_bytes(&bytes[..], &options)?;
             apply_options(&opts, &mut module)?;
             println!("{}", module.display());
         }
         Command::RoundTrip { input, output } => {
             let bytes = std::fs::read(input)?;
             debug!("Loaded {} bytes of Wasm data", bytes.len());
-            let mut module = Module::from_wasm_bytes(&bytes[..])?;
+            let mut module = Module::from_wasm_bytes(&bytes[..], &options)?;
             apply_options(&opts, &mut module)?;
             let produced = module.to_wasm_bytes()?;
             std::fs::write(output, &produced[..])?;

src/frontend.rs

@@ -16,7 +16,12 @@ use wasmparser::{
     BlockType, DataKind, ExternalKind, Name, NameSectionReader, Parser, Payload, TypeRef,
 };
 
-pub fn wasm_to_ir(bytes: &[u8]) -> Result<Module<'_>> {
+#[derive(Clone, Copy, Debug, Default)]
+pub struct FrontendOptions {
+    pub debug: bool,
+}
+
+pub fn wasm_to_ir<'a>(bytes: &'a [u8], options: &FrontendOptions) -> Result<Module<'a>> {
     let mut module = Module::with_orig_bytes(bytes);
     let parser = Parser::new(0);
     let mut next_func = 0;
@@ -36,8 +41,11 @@ pub fn wasm_to_ir(bytes: &[u8]) -> Result<Module<'_>> {
         gimli::LocationLists::new(extra_sections.debug_loc, extra_sections.debug_loclists);
     dwarf.ranges =
         gimli::RangeLists::new(extra_sections.debug_ranges, extra_sections.debug_rnglists);
+
+    if options.debug {
         let debug_map = DebugMap::from_dwarf(dwarf, &mut module.debug, extra_sections.code_offset)?;
         module.debug_map = debug_map;
+    }
 
     Ok(module)
 }

src/ir/module.rs

@@ -4,6 +4,8 @@ use crate::ir::{Debug, DebugMap, FunctionBody};
 use crate::{backend, frontend};
 use anyhow::Result;
 
+pub use crate::frontend::FrontendOptions;
+
 #[derive(Clone, Debug)]
 pub struct Module<'a> {
     pub orig_bytes: &'a [u8],
@@ -159,8 +161,8 @@ impl<'a> Module<'a> {
         })
     }
 
-    pub fn from_wasm_bytes(bytes: &'a [u8]) -> Result<Self> {
+    pub fn from_wasm_bytes(bytes: &'a [u8], options: &FrontendOptions) -> Result<Self> {
-        frontend::wasm_to_ir(bytes)
+        frontend::wasm_to_ir(bytes, options)
     }
 
     pub fn to_wasm_bytes(&self) -> Result<Vec<u8>> {