feat: correct memory trapping behaviour

Signed-off-by: Henry Gressmann <mail@henrygressmann.de>

6 files changed, 47 insertions, 22 deletions

diff --git a/crates/tinywasm/src/error.rs b/crates/tinywasm/src/error.rs
index 7e9ca90..a7dac81 100644
--- a/crates/tinywasm/src/error.rs
+++ b/crates/tinywasm/src/error.rs
@@ -13,7 +13,14 @@ pub enum Trap {
     Unreachable,
 
     /// An out-of-bounds memory access occurred
-    MemoryOutOfBounds,
+    MemoryOutOfBounds {
+        /// The offset of the access
+        offset: usize,
+        /// The size of the access
+        len: usize,
+        /// The maximum size of the memory
+        max: usize,
+    },
 
     /// A division by zero occurred
     DivisionByZero,
diff --git a/crates/tinywasm/src/runtime/executor/macros.rs b/crates/tinywasm/src/runtime/executor/macros.rs
index 08e2149..8a92ac2 100644
--- a/crates/tinywasm/src/runtime/executor/macros.rs
+++ b/crates/tinywasm/src/runtime/executor/macros.rs
@@ -35,6 +35,8 @@ macro_rules! mem_load {
 /// Store a value to memory
 macro_rules! mem_store {
     ($type:ty, $arg:ident, $stack:ident, $store:ident, $module:ident) => {{
+        log::debug!("mem_store!({}, {:?})", stringify!($type), $arg);
+
         mem_store!($type, $type, $arg, $stack, $store, $module)
     }};
 
diff --git a/crates/tinywasm/src/runtime/executor/mod.rs b/crates/tinywasm/src/runtime/executor/mod.rs
index e3d8a93..bff81af 100644
--- a/crates/tinywasm/src/runtime/executor/mod.rs
+++ b/crates/tinywasm/src/runtime/executor/mod.rs
@@ -238,7 +238,7 @@ fn exec_one(
 
         EndFunc => {
             debug_assert!(
-                cf.labels.len() > 0,
+                cf.labels.len() == 0,
                 "endfunc: block frames not empty, this should have been validated by the parser"
             );
 
diff --git a/crates/tinywasm/src/store.rs b/crates/tinywasm/src/store.rs
index a50e8b2..db996c8 100644
--- a/crates/tinywasm/src/store.rs
+++ b/crates/tinywasm/src/store.rs
@@ -337,7 +337,7 @@ impl TableInstance {
     }
 }
 
-pub(crate) const PAGE_SIZE: usize = 64_000;
+pub(crate) const PAGE_SIZE: usize = 65536;
 pub(crate) const MAX_PAGES: usize = 65536;
 pub(crate) const MAX_SIZE: usize = PAGE_SIZE * MAX_PAGES;
 
@@ -366,35 +366,51 @@ impl MemoryInstance {
     }
 
     pub(crate) fn store(&mut self, addr: usize, _align: usize, data: &[u8]) -> Result<()> {
-        if addr + data.len() > self.data.len() {
-            return Err(Error::Other(format!(
-                "memory store out of bounds: offset={}, len={}, mem_size={}",
-                addr,
-                data.len(),
-                self.data.len()
-            )));
+        let end = addr.checked_add(data.len()).ok_or_else(|| {
+            Error::Trap(crate::Trap::MemoryOutOfBounds {
+                offset: addr,
+                len: data.len(),
+                max: self.data.len(),
+            })
+        })?;
+
+        if end > self.data.len() || end < addr {
+            return Err(Error::Trap(crate::Trap::MemoryOutOfBounds {
+                offset: addr,
+                len: data.len(),
+                max: self.data.len(),
+            }));
         }
 
         // WebAssembly doesn't require alignment for stores
-        self.data[addr..addr + data.len()].copy_from_slice(data);
+        self.data[addr..end].copy_from_slice(data);
         Ok(())
     }
 
     pub(crate) fn load(&self, addr: usize, _align: usize, len: usize) -> Result<&[u8]> {
-        if addr + len > self.data.len() {
-            return Err(Error::Other(format!(
-                "memory load out of bounds: offset={}, len={}, mem_size={}",
-                addr,
+        let end = addr.checked_add(len).ok_or_else(|| {
+            Error::Trap(crate::Trap::MemoryOutOfBounds {
+                offset: addr,
+                len,
+                max: self.data.len(),
+            })
+        })?;
+
+        if end > self.data.len() {
+            return Err(Error::Trap(crate::Trap::MemoryOutOfBounds {
+                offset: addr,
                 len,
-                self.data.len()
-            )));
+                max: self.data.len(),
+            }));
         }
 
         // WebAssembly doesn't require alignment for loads
-        Ok(&self.data[addr..addr + len])
+        Ok(&self.data[addr..end])
     }
 
     pub(crate) fn size(&self) -> i32 {
+        log::debug!("memory pages: {}", self.page_count);
+        log::debug!("memory size: {}", self.page_count * PAGE_SIZE);
         self.page_count as i32
     }
 
diff --git a/crates/tinywasm/tests/generated/mvp.csv b/crates/tinywasm/tests/generated/mvp.csv
index 4df8c8d..d715231 100644
--- a/crates/tinywasm/tests/generated/mvp.csv
+++ b/crates/tinywasm/tests/generated/mvp.csv
@@ -2,4 +2,4 @@
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