Feat enhanced tinytunable test

lib/api/src/sys/tunables.rs

@@ -178,38 +178,48 @@ mod tests {
     use std::cell::UnsafeCell;
     use std::ptr::NonNull;
     use wasmer_types::{MemoryError, MemoryStyle, MemoryType, Pages, WASM_PAGE_SIZE};
-    use wasmer_vm::{LinearMemory, MaybeInstanceOwned};
+    use wasmer_vm::LinearMemory;
 
     #[derive(Debug)]
     struct VMTinyMemory {
-        mem: [u8; WASM_PAGE_SIZE],
+        mem: Vec<u8>,
+        memory_definition: Option<UnsafeCell<VMMemoryDefinition>>,
     }
 
     unsafe impl Send for VMTinyMemory {}
     unsafe impl Sync for VMTinyMemory {}
 
     impl VMTinyMemory {
         pub fn new() -> Result<Self, MemoryError> {
-            Ok(VMTinyMemory {
-                mem: [0; WASM_PAGE_SIZE],
-            })
+            let sz = 18 * WASM_PAGE_SIZE;
+            let mut memory = Vec::new();
+            memory.resize(sz, 0);
+            let mut ret = VMTinyMemory {
+                mem: memory,
+                memory_definition: None,
+            };
+            ret.memory_definition = Some(UnsafeCell::new(VMMemoryDefinition {
+                base: ret.mem.as_ptr() as _,
+                current_length: sz,
+            }));
+            Ok(ret)
         }
     }
 
     impl LinearMemory for VMTinyMemory {
         fn ty(&self) -> MemoryType {
             MemoryType {
-                minimum: Pages::from(1u32),
-                maximum: Some(Pages::from(1u32)),
+                minimum: Pages::from(18u32),
+                maximum: Some(Pages::from(18u32)),
                 shared: false,
             }
         }
         fn size(&self) -> Pages {
-            Pages::from(1u32)
+            Pages::from(18u32)
         }
         fn style(&self) -> MemoryStyle {
             MemoryStyle::Static {
-                bound: Pages::from(1u32),
+                bound: Pages::from(18u32),
                 offset_guard_size: 0,
             }
         }
@@ -220,15 +230,28 @@ mod tests {
             })
         }
         fn vmmemory(&self) -> NonNull<VMMemoryDefinition> {
-            MaybeInstanceOwned::Host(Box::new(UnsafeCell::new(VMMemoryDefinition {
-                base: self.mem.as_ptr() as _,
-                current_length: WASM_PAGE_SIZE,
-            })))
-            .as_ptr()
+            unsafe {
+                NonNull::new(
+                    self.memory_definition
+                        .as_ref()
+                        .unwrap()
+                        .get()
+                        .as_mut()
+                        .unwrap() as _,
+                )
+                .unwrap()
+            }
         }
         fn try_clone(&self) -> Option<Box<dyn LinearMemory + 'static>> {
             None
         }
+        /*
+        // this code allow custom memory to be ignoring init_memory
+        use wasmer_vm::Trap;
+        unsafe fn initialize_with_data(&self, _start: usize, _data: &[u8]) -> Result<(), Trap> {
+            Ok(())
+        }
+        */
     }
 
     impl From<VMTinyMemory> for wasmer_vm::VMMemory {
@@ -241,7 +264,7 @@ mod tests {
     impl Tunables for TinyTunables {
         fn memory_style(&self, _memory: &MemoryType) -> MemoryStyle {
             MemoryStyle::Static {
-                bound: Pages::from(1u32),
+                bound: Pages::from(18u32),
                 offset_guard_size: 0,
             }
         }
@@ -262,9 +285,16 @@ mod tests {
             &self,
             _ty: &MemoryType,
             _style: &MemoryStyle,
-            _vm_definition_location: NonNull<VMMemoryDefinition>,
+            vm_definition_location: NonNull<VMMemoryDefinition>,
         ) -> Result<VMMemory, MemoryError> {
             let memory = VMTinyMemory::new().unwrap();
+            // now, it's important to update vm_definition_location with the memory information!
+            let mut ptr = vm_definition_location;
+            let md = ptr.as_mut();
+            let unsafecell = memory.memory_definition.as_ref().unwrap();
+            let def = unsafecell.get().as_ref().unwrap();
+            md.base = def.base;
+            md.current_length = def.current_length;
             Ok(memory.into())
         }
 
@@ -293,13 +323,13 @@ mod tests {
         let vmmemory = tunables.create_host_memory(
             &MemoryType::new(1u32, Some(100u32), true),
             &MemoryStyle::Static {
-                bound: Pages::from(1u32),
+                bound: Pages::from(18u32),
                 offset_guard_size: 0u64,
             },
         );
         let mut vmmemory = vmmemory.unwrap();
-        assert!(vmmemory.grow(Pages::from(2u32)).is_err());
-        assert_eq!(vmmemory.size(), Pages::from(1u32));
+        assert!(vmmemory.grow(Pages::from(50u32)).is_err());
+        assert_eq!(vmmemory.size(), Pages::from(18u32));
         assert_eq!(
             vmmemory.grow(Pages::from(0u32)).err().unwrap(),
             MemoryError::CouldNotGrow {
@@ -308,4 +338,42 @@ mod tests {
             }
         );
     }
+
+    #[test]
+    fn check_customtunables() -> Result<(), Box<dyn std::error::Error>> {
+        use crate::{imports, wat2wasm, Instance, Memory, Module, Store};
+        use wasmer_compiler_cranelift::Cranelift;
+
+        let wasm_bytes = wat2wasm(
+            br#"(module
+            (memory (;0;) 18)
+            (global (;0;) (mut i32) i32.const 1048576)
+            (export "memory" (memory 0))
+            (data (;0;) (i32.const 1048576) "*\00\00\00")
+          )"#,
+        )?;
+        let compiler = Cranelift::default();
+
+        let tunables = TinyTunables {};
+        let mut store = Store::new_with_tunables(compiler, tunables);
+        //let mut store = Store::new(compiler);
+        let module = Module::new(&store, wasm_bytes)?;
+        let import_object = imports! {};
+        let instance = Instance::new(&mut store, &module, &import_object)?;
+
+        let mut memories: Vec<Memory> = instance
+            .exports
+            .iter()
+            .memories()
+            .map(|pair| pair.1.clone())
+            .collect();
+        assert_eq!(memories.len(), 1);
+        let first_memory = memories.pop().unwrap();
+        assert_eq!(first_memory.ty(&store).maximum.unwrap(), Pages(18));
+        let view = first_memory.view(&store);
+        let x = unsafe { view.data_unchecked_mut() }[0];
+        assert_eq!(x, 0);
+
+        Ok(())
+    }
 }

lib/vm/src/instance/mod.rs

@@ -206,6 +206,7 @@ impl Instance {
         unsafe { self.vmctx_plus_offset(self.offsets.vmctx_tables_begin()) }
     }
 
+    #[allow(dead_code)]
     /// Get a locally defined or imported memory.
     fn get_memory(&self, index: MemoryIndex) -> VMMemoryDefinition {
         if let Some(local_index) = self.module.local_memory_index(index) {
@@ -240,6 +241,21 @@ impl Instance {
         unsafe { self.vmctx_plus_offset(self.offsets.vmctx_memories_begin()) }
     }
 
+    /// Get a locally defined or imported memory.
+    fn get_vmmemory(&self, index: MemoryIndex) -> &VMMemory {
+        if let Some(local_index) = self.module.local_memory_index(index) {
+            unsafe {
+                self.memories
+                    .get(local_index)
+                    .unwrap()
+                    .get(self.context.as_ref().unwrap())
+            }
+        } else {
+            let import = self.imported_memory(index);
+            unsafe { import.handle.get(self.context.as_ref().unwrap()) }
+        }
+    }
+
     /// Return the indexed `VMGlobalDefinition`.
     fn global(&self, index: LocalGlobalIndex) -> VMGlobalDefinition {
         unsafe { self.global_ptr(index).as_ref().clone() }
@@ -701,29 +717,22 @@ impl Instance {
     ) -> Result<(), Trap> {
         // https://webassembly.github.io/bulk-memory-operations/core/exec/instructions.html#exec-memory-init
 
-        let memory = self.get_memory(memory_index);
+        let memory = self.get_vmmemory(memory_index);
         let passive_data = self.passive_data.borrow();
         let data = passive_data.get(&data_index).map_or(&[][..], |d| &**d);
 
+        let current_length = unsafe { memory.vmmemory().as_ref().current_length };
         if src
             .checked_add(len)
             .map_or(true, |n| n as usize > data.len())
-            || dst.checked_add(len).map_or(true, |m| {
-                usize::try_from(m).unwrap() > memory.current_length
-            })
+            || dst
+                .checked_add(len)
+                .map_or(true, |m| usize::try_from(m).unwrap() > current_length)
         {
             return Err(Trap::lib(TrapCode::HeapAccessOutOfBounds));
         }
-
         let src_slice = &data[src as usize..(src + len) as usize];
-
-        unsafe {
-            let dst_start = memory.base.add(dst as usize);
-            let dst_slice = slice::from_raw_parts_mut(dst_start, len as usize);
-            dst_slice.copy_from_slice(src_slice);
-        }
-
-        Ok(())
+        unsafe { memory.initialize_with_data(dst as usize, src_slice) }
     }
 
     /// Drop the given data segment, truncating its length to zero.
@@ -1147,6 +1156,7 @@ fn get_memory_init_start(init: &DataInitializer<'_>, instance: &Instance) -> usi
 }
 
 #[allow(clippy::mut_from_ref)]
+#[allow(dead_code)]
 /// Return a byte-slice view of a memory's data.
 unsafe fn get_memory_slice<'instance>(
     init: &DataInitializer<'_>,
@@ -1242,21 +1252,18 @@ fn initialize_memories(
     data_initializers: &[DataInitializer<'_>],
 ) -> Result<(), Trap> {
     for init in data_initializers {
-        let memory = instance.get_memory(init.location.memory_index);
+        let memory = instance.get_vmmemory(init.location.memory_index);
 
         let start = get_memory_init_start(init, instance);
-        if start
-            .checked_add(init.data.len())
-            .map_or(true, |end| end > memory.current_length)
-        {
-            return Err(Trap::lib(TrapCode::HeapAccessOutOfBounds));
-        }
-
         unsafe {
-            let mem_slice = get_memory_slice(init, instance);
-            let end = start + init.data.len();
-            let to_init = &mut mem_slice[start..end];
-            to_init.copy_from_slice(init.data);
+            let current_length = memory.vmmemory().as_ref().current_length;
+            if start
+                .checked_add(init.data.len())
+                .map_or(true, |end| end > current_length)
+            {
+                return Err(Trap::lib(TrapCode::HeapAccessOutOfBounds));
+            }
+            memory.initialize_with_data(start, init.data)?;
         }
     }
 

lib/vm/src/lib.rs

@@ -45,7 +45,7 @@ pub use crate::function_env::VMFunctionEnvironment;
 pub use crate::global::*;
 pub use crate::imports::Imports;
 pub use crate::instance::{InstanceAllocator, InstanceHandle};
-pub use crate::memory::{LinearMemory, VMMemory};
+pub use crate::memory::{initialize_memory_with_data, LinearMemory, VMMemory};
 pub use crate::mmap::Mmap;
 pub use crate::probestack::PROBESTACK;
 pub use crate::sig_registry::SignatureRegistry;

lib/vm/src/memory.rs

@@ -5,11 +5,13 @@
 //!
 //! `Memory` is to WebAssembly linear memories what `Table` is to WebAssembly tables.
 
+use crate::trap::Trap;
 use crate::{mmap::Mmap, store::MaybeInstanceOwned, vmcontext::VMMemoryDefinition};
 use more_asserts::assert_ge;
 use std::cell::UnsafeCell;
 use std::convert::TryInto;
 use std::ptr::NonNull;
+use std::slice;
 use wasmer_types::{Bytes, MemoryError, MemoryStyle, MemoryType, Pages};
 
 // The memory mapped area
@@ -342,6 +344,11 @@ impl LinearMemory for VMMemory {
     fn try_clone(&self) -> Option<Box<dyn LinearMemory + 'static>> {
         self.0.try_clone()
     }
+
+    /// Initialize memory with data
+    unsafe fn initialize_with_data(&self, start: usize, data: &[u8]) -> Result<(), Trap> {
+        self.0.initialize_with_data(start, data)
+    }
 }
 
 impl VMMemory {
@@ -385,6 +392,21 @@ impl VMMemory {
     }
 }
 
+#[doc(hidden)]
+/// Default implementation to initialize memory with data
+pub unsafe fn initialize_memory_with_data(
+    memory: &VMMemoryDefinition,
+    start: usize,
+    data: &[u8],
+) -> Result<(), Trap> {
+    let mem_slice = slice::from_raw_parts_mut(memory.base, memory.current_length);
+    let end = start + data.len();
+    let to_init = &mut mem_slice[start..end];
+    to_init.copy_from_slice(data);
+
+    Ok(())
+}
+
 /// Represents memory that is used by the WebAsssembly module
 pub trait LinearMemory
 where
@@ -410,4 +432,14 @@ where
 
     /// Attempts to clone this memory (if its clonable)
     fn try_clone(&self) -> Option<Box<dyn LinearMemory + 'static>>;
+
+    #[doc(hidden)]
+    /// # Safety
+    /// This function is unsafe because WebAssembly specification requires that data is always set at initialization time.
+    /// It should be the implementors responsibility to make sure this respects the spec
+    unsafe fn initialize_with_data(&self, start: usize, data: &[u8]) -> Result<(), Trap> {
+        let memory = self.vmmemory().as_ref();
+
+        initialize_memory_with_data(memory, start, data)
+    }
 }