add support for symbol maps

Cargo.toml

@@ -21,6 +21,7 @@ include = [
 [dependencies]
 structopt = "0.2.11"
 wabt = "0.7.2"
+hashbrown = "0.1.8"
 wasmer-clif-backend = { path = "lib/clif-backend" }
 wasmer-runtime = { path = "lib/runtime" }
 wasmer-runtime-core = { path = "lib/runtime-core" }

lib/clif-backend/src/lib.rs

@@ -16,7 +16,7 @@ use target_lexicon::Triple;
 
 use wasmer_runtime_core::cache::{Artifact, Error as CacheError};
 use wasmer_runtime_core::{
-    backend::{Compiler, Token},
+    backend::{Compiler, CompilerConfig, Token},
     error::{CompileError, CompileResult},
     module::ModuleInner,
 };
@@ -39,12 +39,17 @@ impl CraneliftCompiler {
 
 impl Compiler for CraneliftCompiler {
     /// Compiles wasm binary to a wasmer module.
-    fn compile(&self, wasm: &[u8], _: Token) -> CompileResult<ModuleInner> {
+    fn compile(
+        &self,
+        wasm: &[u8],
+        compiler_config: CompilerConfig,
+        _: Token,
+    ) -> CompileResult<ModuleInner> {
         validate(wasm)?;
 
         let isa = get_isa();
 
-        let mut module = module::Module::new();
+        let mut module = module::Module::new(&compiler_config);
         let module_env = module_env::ModuleEnv::new(&mut module, &*isa);
 
         let func_bodies = module_env.translate(wasm)?;

lib/clif-backend/src/module.rs

@@ -10,7 +10,7 @@ use std::sync::Arc;
 use wasmer_runtime_core::cache::{Artifact, Error as CacheError};
 
 use wasmer_runtime_core::{
-    backend::Backend,
+    backend::{Backend, CompilerConfig},
     error::CompileResult,
     module::{ModuleInfo, ModuleInner, StringTable},
     structures::{Map, TypedIndex},
@@ -25,7 +25,7 @@ pub struct Module {
 }
 
 impl Module {
-    pub fn new() -> Self {
+    pub fn new(compiler_config: &CompilerConfig) -> Self {
         Self {
             info: ModuleInfo {
                 memories: Map::new(),
@@ -50,6 +50,7 @@ impl Module {
 
                 namespace_table: StringTable::new(),
                 name_table: StringTable::new(),
+                em_symbol_map: compiler_config.symbol_map.clone(),
             },
         }
     }

lib/clif-backend/src/resolver.rs

@@ -374,20 +374,26 @@ fn round_up(n: usize, multiple: usize) -> usize {
 }
 
 extern "C" fn i32_print(_ctx: &mut vm::Ctx, n: i32) {
-    print!(" i32: {},", n);
+    eprint!(" i32: {},", n);
 }
 extern "C" fn i64_print(_ctx: &mut vm::Ctx, n: i64) {
-    print!(" i64: {},", n);
+    eprint!(" i64: {},", n);
 }
 extern "C" fn f32_print(_ctx: &mut vm::Ctx, n: f32) {
-    print!(" f32: {},", n);
+    eprint!(" f32: {},", n);
 }
 extern "C" fn f64_print(_ctx: &mut vm::Ctx, n: f64) {
-    print!(" f64: {},", n);
+    eprint!(" f64: {},", n);
 }
-extern "C" fn start_debug(_ctx: &mut vm::Ctx, func_index: u32) {
-    print!("func ({}), args: [", func_index);
+extern "C" fn start_debug(ctx: &mut vm::Ctx, func_index: u32) {
+    if let Some(symbol_map) = unsafe { ctx.borrow_symbol_map() } {
+        if let Some(fn_name) = symbol_map.get(&func_index) {
+            eprint!("func ({} ({})), args: [", fn_name, func_index);
+            return;
+        }
+    }
+    eprint!("func ({}), args: [", func_index);
 }
 extern "C" fn end_debug(_ctx: &mut vm::Ctx) {
-    println!(" ]");
+    eprintln!(" ]");
 }

lib/dynasm-backend/src/lib.rs

@@ -25,7 +25,7 @@ mod stack;
 use crate::codegen::{CodegenError, ModuleCodeGenerator};
 use crate::parse::LoadError;
 use wasmer_runtime_core::{
-    backend::{sys::Memory, Backend, CacheGen, Compiler, Token},
+    backend::{sys::Memory, Backend, CacheGen, Compiler, CompilerConfig, Token},
     cache::{Artifact, Error as CacheError},
     error::{CompileError, CompileResult},
     module::{ModuleInfo, ModuleInner},
@@ -51,9 +51,14 @@ impl SinglePassCompiler {
 }
 
 impl Compiler for SinglePassCompiler {
-    fn compile(&self, wasm: &[u8], _: Token) -> CompileResult<ModuleInner> {
+    fn compile(
+        &self,
+        wasm: &[u8],
+        compiler_config: CompilerConfig,
+        _: Token,
+    ) -> CompileResult<ModuleInner> {
         let mut mcg = codegen_x64::X64ModuleCodeGenerator::new();
-        let info = parse::read_module(wasm, Backend::Dynasm, &mut mcg)?;
+        let info = parse::read_module(wasm, Backend::Dynasm, &mut mcg, &compiler_config)?;
         let (ec, resolver) = mcg.finalize(&info)?;
         Ok(ModuleInner {
             cache_gen: Box::new(Placeholder),

lib/dynasm-backend/src/parse.rs

@@ -1,6 +1,6 @@
 use crate::codegen::{CodegenError, FunctionCodeGenerator, ModuleCodeGenerator};
 use wasmer_runtime_core::{
-    backend::{Backend, FuncResolver, ProtectedCaller},
+    backend::{Backend, CompilerConfig, FuncResolver, ProtectedCaller},
     module::{
         DataInitializer, ExportIndex, ImportName, ModuleInfo, StringTable, StringTableBuilder,
         TableInitializer,
@@ -70,6 +70,7 @@ pub fn read_module<
     wasm: &[u8],
     backend: Backend,
     mcg: &mut MCG,
+    compiler_config: &CompilerConfig,
 ) -> Result<ModuleInfo, LoadError> {
     validate(wasm)?;
     let mut info = ModuleInfo {
@@ -95,6 +96,8 @@ pub fn read_module<
 
         namespace_table: StringTable::new(),
         name_table: StringTable::new(),
+
+        em_symbol_map: compiler_config.symbol_map.clone(),
     };
 
     let mut reader = ModuleReader::new(wasm)?;

lib/llvm-backend/src/lib.rs

@@ -6,7 +6,7 @@ use inkwell::{
     OptimizationLevel,
 };
 use wasmer_runtime_core::{
-    backend::{Compiler, Token},
+    backend::{Compiler, CompilerConfig, Token},
     cache::{Artifact, Error as CacheError},
     error::CompileError,
     module::ModuleInner,
@@ -32,10 +32,15 @@ impl LLVMCompiler {
 }
 
 impl Compiler for LLVMCompiler {
-    fn compile(&self, wasm: &[u8], _: Token) -> Result<ModuleInner, CompileError> {
+    fn compile(
+        &self,
+        wasm: &[u8],
+        compiler_config: CompilerConfig,
+        _: Token,
+    ) -> Result<ModuleInner, CompileError> {
         validate(wasm)?;
 
-        let (info, code_reader) = read_info::read_module(wasm).unwrap();
+        let (info, code_reader) = read_info::read_module(wasm, compiler_config).unwrap();
         let (module, intrinsics) = code::parse_function_bodies(&info, code_reader).unwrap();
 
         let (backend, protected_caller) = backend::LLVMBackend::new(module, intrinsics);
@@ -121,7 +126,7 @@ fn test_read_module() {
     "#;
     let wasm = wat2wasm(wat).unwrap();
 
-    let (info, code_reader) = read_info::read_module(&wasm).unwrap();
+    let (info, code_reader) = read_info::read_module(&wasm, Default::default()).unwrap();
 
     let (module, intrinsics) = code::parse_function_bodies(&info, code_reader).unwrap();
 

lib/llvm-backend/src/read_info.rs

@@ -1,5 +1,5 @@
 use wasmer_runtime_core::{
-    backend::Backend,
+    backend::{Backend, CompilerConfig},
     module::{
         DataInitializer, ExportIndex, ImportName, ModuleInfo, StringTable, StringTableBuilder,
         TableInitializer,
@@ -18,7 +18,10 @@ use wasmparser::{
     SectionCode, Type as WpType,
 };
 
-pub fn read_module(wasm: &[u8]) -> Result<(ModuleInfo, CodeSectionReader), BinaryReaderError> {
+pub fn read_module(
+    wasm: &[u8],
+    compiler_config: CompilerConfig,
+) -> Result<(ModuleInfo, CodeSectionReader), BinaryReaderError> {
     let mut info = ModuleInfo {
         memories: Map::new(),
         globals: Map::new(),
@@ -42,6 +45,8 @@ pub fn read_module(wasm: &[u8]) -> Result<(ModuleInfo, CodeSectionReader), Binar
 
         namespace_table: StringTable::new(),
         name_table: StringTable::new(),
+
+        em_symbol_map: compiler_config.symbol_map.clone(),
     };
 
     let mut reader = ModuleReader::new(wasm)?;

lib/runtime-core/src/backend.rs

@@ -14,6 +14,8 @@ use crate::{
 };
 use std::{any::Any, ptr::NonNull};
 
+use hashbrown::HashMap;
+
 pub mod sys {
     pub use crate::sys::*;
 }
@@ -38,11 +40,28 @@ impl Token {
     }
 }
 
+/// Configuration data for the compiler
+pub struct CompilerConfig {
+    /// Symbol information generated from emscripten; used for more detailed debug messages
+    pub symbol_map: Option<HashMap<u32, String>>,
+}
+
+impl Default for CompilerConfig {
+    fn default() -> CompilerConfig {
+        CompilerConfig { symbol_map: None }
+    }
+}
+
 pub trait Compiler {
     /// Compiles a `Module` from WebAssembly binary format.
     /// The `CompileToken` parameter ensures that this can only
     /// be called from inside the runtime.
-    fn compile(&self, wasm: &[u8], _: Token) -> CompileResult<ModuleInner>;
+    fn compile(
+        &self,
+        wasm: &[u8],
+        comp_conf: CompilerConfig,
+        _: Token,
+    ) -> CompileResult<ModuleInner>;
 
     unsafe fn from_cache(&self, cache: Artifact, _: Token) -> Result<ModuleInner, CacheError>;
 }

lib/runtime-core/src/lib.rs

@@ -68,7 +68,20 @@ pub fn compile_with(
 ) -> CompileResult<module::Module> {
     let token = backend::Token::generate();
     compiler
-        .compile(wasm, token)
+        .compile(wasm, Default::default(), token)
+        .map(|inner| module::Module::new(Arc::new(inner)))
+}
+
+/// The same as `compile_with` but changes the compiler behavior
+/// with the values in the `CompilerConfig`
+pub fn compile_with_config(
+    wasm: &[u8],
+    compiler: &dyn backend::Compiler,
+    compiler_config: backend::CompilerConfig,
+) -> CompileResult<module::Module> {
+    let token = backend::Token::generate();
+    compiler
+        .compile(wasm, compiler_config, token)
         .map(|inner| module::Module::new(Arc::new(inner)))
 }
 

lib/runtime-core/src/module.rs

@@ -56,6 +56,9 @@ pub struct ModuleInfo {
 
     pub namespace_table: StringTable<NamespaceIndex>,
     pub name_table: StringTable<NameIndex>,
+
+    /// Symbol information from emscripten
+    pub em_symbol_map: Option<HashMap<u32, String>>,
 }
 
 /// A compiled WebAssembly module.

lib/runtime-core/src/vm.rs

@@ -7,6 +7,8 @@ use crate::{
 };
 use std::{ffi::c_void, mem, ptr};
 
+use hashbrown::HashMap;
+
 /// The context of the currently running WebAssembly instance.
 ///
 ///
@@ -156,6 +158,11 @@ impl Ctx {
             },
         }
     }
+
+    /// Gives access to the emscripten symbol map, used for debugging
+    pub unsafe fn borrow_symbol_map(&self) -> &Option<HashMap<u32, String>> {
+        &(*self.module).info.em_symbol_map
+    }
 }
 
 #[doc(hidden)]
@@ -608,6 +615,8 @@ mod vm_ctx_tests {
 
                 namespace_table: StringTable::new(),
                 name_table: StringTable::new(),
+
+                em_symbol_map: None,
             },
         }
     }

lib/runtime/src/lib.rs

@@ -110,7 +110,7 @@ pub mod units {
 
 pub mod cache;
 
-use wasmer_runtime_core::backend::Compiler;
+use wasmer_runtime_core::backend::{Compiler, CompilerConfig};
 
 /// Compile WebAssembly binary code into a [`Module`].
 /// This function is useful if it is necessary to
@@ -129,6 +129,15 @@ pub fn compile(wasm: &[u8]) -> error::CompileResult<Module> {
     wasmer_runtime_core::compile_with(&wasm[..], default_compiler())
 }
 
+/// The same as `compile` but takes a `CompilerConfig` for the purpose of
+/// changing the compiler's behavior
+pub fn compile_with_config(
+    wasm: &[u8],
+    compiler_config: CompilerConfig,
+) -> error::CompileResult<Module> {
+    wasmer_runtime_core::compile_with_config(&wasm[..], default_compiler(), compiler_config)
+}
+
 /// Compile and instantiate WebAssembly code without
 /// creating a [`Module`].
 ///