From 0382b0660280a828498310322bfd2d50de51187a Mon Sep 17 00:00:00 2001 From: Henry Gressmann Date: Tue, 23 Jan 2024 23:04:01 +0100 Subject: chore: support partially initialized module instances Signed-off-by: Henry Gressmann --- crates/parser/src/lib.rs | 6 +++++- crates/tinywasm/src/instance.rs | 15 +++++++++++++-- crates/tinywasm/src/runtime/executor/mod.rs | 17 ++++++++++------ crates/tinywasm/src/store.rs | 30 +++++++++++++++++------------ crates/tinywasm/tests/generated/mvp.csv | 2 +- 5 files changed, 48 insertions(+), 22 deletions(-) (limited to 'crates') diff --git a/crates/parser/src/lib.rs b/crates/parser/src/lib.rs index ae6cc4d..aa76ea3 100644 --- a/crates/parser/src/lib.rs +++ b/crates/parser/src/lib.rs @@ -120,7 +120,11 @@ impl TryFrom for TinyWasmModule { WasmFunction { instructions: f.body, locals: f.locals, - ty: reader.func_types.get(ty_idx as usize).unwrap().clone(), + ty: reader + .func_types + .get(ty_idx as usize) + .expect("No func type for func, this is a bug") + .clone(), }, ) }) diff --git a/crates/tinywasm/src/instance.rs b/crates/tinywasm/src/instance.rs index d7298af..889d4f8 100644 --- a/crates/tinywasm/src/instance.rs +++ b/crates/tinywasm/src/instance.rs @@ -20,6 +20,8 @@ pub struct ModuleInstance(Arc); #[allow(dead_code)] #[derive(Debug)] pub(crate) struct ModuleInstanceInner { + pub(crate) failed_to_instantiate: bool, + pub(crate) store_id: usize, pub(crate) idx: ModuleInstanceAddr, @@ -69,10 +71,11 @@ impl ModuleInstance { addrs.tables.extend(store.init_tables(data.table_types.into(), idx)?); addrs.memories.extend(store.init_memories(data.memory_types.into(), idx)?); - let elem_addrs = store.init_elements(&addrs.tables, &addrs.funcs, data.elements.into(), idx)?; - let data_addrs = store.init_datas(&addrs.memories, data.data.into(), idx)?; + let (elem_addrs, elem_trapped) = store.init_elements(&addrs.tables, &addrs.funcs, data.elements.into(), idx)?; + let (data_addrs, data_trapped) = store.init_datas(&addrs.memories, data.data.into(), idx)?; let instance = ModuleInstanceInner { + failed_to_instantiate: elem_trapped.is_some() || data_trapped.is_some(), store_id: store.id(), idx, types: data.func_types, @@ -90,6 +93,14 @@ impl ModuleInstance { let instance = ModuleInstance::new(instance); store.add_instance(instance.clone())?; + if let Some(trap) = elem_trapped { + return Err(trap.into()); + }; + + if let Some(trap) = data_trapped { + return Err(trap.into()); + }; + Ok(instance) } diff --git a/crates/tinywasm/src/runtime/executor/mod.rs b/crates/tinywasm/src/runtime/executor/mod.rs index 38d59d5..4875536 100644 --- a/crates/tinywasm/src/runtime/executor/mod.rs +++ b/crates/tinywasm/src/runtime/executor/mod.rs @@ -6,7 +6,7 @@ use crate::{ runtime::{BlockType, LabelFrame}, CallFrame, Error, FuncContext, LabelArgs, ModuleInstance, Result, Store, Trap, }; -use alloc::{string::ToString, vec::Vec}; +use alloc::{format, string::ToString, vec::Vec}; use tinywasm_types::{ElementKind, Instruction, ValType}; mod macros; @@ -25,10 +25,7 @@ impl DefaultRuntime { // The function to execute, gets updated from ExecResult::Call let mut instrs = &wasm_func.instructions; - let mut current_module = store - .get_module_instance(func_inst.owner) - .expect("exec expected module instance to exist for function") - .clone(); + let mut current_module = store.get_module_instance(func_inst.owner).unwrap().clone(); while let Some(instr) = instrs.get(cf.instr_ptr) { match exec_one(&mut cf, instr, instrs, stack, store, ¤t_module)? { @@ -40,7 +37,15 @@ impl DefaultRuntime { instrs = &wasm_func.instructions; if cf.func_instance.owner != current_module.id() { - current_module.swap(store.get_module_instance(cf.func_instance.owner).unwrap().clone()); + current_module.swap( + store + .get_module_instance(cf.func_instance.owner) + .expect(&format!( + "exec expected module instance {} to exist for function", + cf.func_instance.owner + )) + .clone(), + ); } continue; diff --git a/crates/tinywasm/src/store.rs b/crates/tinywasm/src/store.rs index 9bbb125..1188658 100644 --- a/crates/tinywasm/src/store.rs +++ b/crates/tinywasm/src/store.rs @@ -46,6 +46,7 @@ impl Store { /// Get a module instance by the internal id pub fn get_module_instance(&self, addr: ModuleInstanceAddr) -> Option<&ModuleInstance> { + log::debug!("existing module instances: {:?}", self.module_instances.len()); self.module_instances.get(addr as usize) } @@ -180,7 +181,7 @@ impl Store { func_addrs: &[FuncAddr], elements: Vec, idx: ModuleInstanceAddr, - ) -> Result> { + ) -> Result<(Box<[Addr]>, Option)> { let elem_count = self.data.elements.len(); let mut elem_addrs = Vec::with_capacity(elem_count); for (i, element) in elements.into_iter().enumerate() { @@ -214,15 +215,17 @@ impl Store { .copied() .ok_or_else(|| Error::Other(format!("table {} not found for element {}", table, i)))?; - // a. Let n be the length of the vector elem[i].init - // b. Execute the instruction sequence einstrs - // c. Execute the instruction i32.const 0 - // d. Execute the instruction i32.const n - // e. Execute the instruction table.init tableidx i if let Some(table) = self.data.tables.get_mut(table_addr as usize) { - table.borrow_mut().init(func_addrs, offset, &init)?; + // In wasm 2.0, it's possible to call a function that hasn't been instantiated yet, + // when using a partially initialized active element segments. + // This isn't mentioned in the spec, but the "unofficial" testsuite has a test for it: + // https://github.com/WebAssembly/testsuite/blob/5a1a590603d81f40ef471abba70a90a9ae5f4627/linking.wast#L264-L276 + // I have NO IDEA why this is allowed, but it is. + if let Err(Error::Trap(trap)) = table.borrow_mut().init(func_addrs, offset, &init) { + return Ok((elem_addrs.into_boxed_slice(), Some(trap))); + } } else { - log::error!("table {} not found", table); + return Err(Error::Other(format!("table {} not found for element {}", table, i))); } // f. Execute the instruction elm.drop i @@ -235,7 +238,7 @@ impl Store { } // this should be optimized out by the compiler - Ok(elem_addrs.into_boxed_slice()) + Ok((elem_addrs.into_boxed_slice(), None)) } /// Add data to the store, returning their addresses in the store @@ -244,7 +247,7 @@ impl Store { mem_addrs: &[MemAddr], datas: Vec, idx: ModuleInstanceAddr, - ) -> Result> { + ) -> Result<(Box<[Addr]>, Option)> { let data_count = self.data.datas.len(); let mut data_addrs = Vec::with_capacity(data_count); for (i, data) in datas.into_iter().enumerate() { @@ -268,7 +271,10 @@ impl Store { Error::Other(format!("memory {} not found for data segment {}", mem_addr, i)) })?; - mem.borrow_mut().store(offset as usize, 0, &data.data)?; + // See comment for active element sections in the function above why we need to do this here + if let Err(Error::Trap(trap)) = mem.borrow_mut().store(offset as usize, 0, &data.data) { + return Ok((data_addrs.into_boxed_slice(), Some(trap))); + } // drop the data continue; @@ -281,7 +287,7 @@ impl Store { } // this should be optimized out by the compiler - Ok(data_addrs.into_boxed_slice()) + Ok((data_addrs.into_boxed_slice(), None)) } pub(crate) fn add_global(&mut self, ty: GlobalType, value: RawWasmValue, idx: ModuleInstanceAddr) -> Result { diff --git a/crates/tinywasm/tests/generated/mvp.csv b/crates/tinywasm/tests/generated/mvp.csv index 5a34eba..9ac498e 100644 --- a/crates/tinywasm/tests/generated/mvp.csv +++ b/crates/tinywasm/tests/generated/mvp.csv @@ -2,4 +2,4 @@ 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