chore: decrease max call stack size and fix corresponding tests

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

8 files changed, 81 insertions, 21 deletions

diff --git a/crates/tinywasm/src/error.rs b/crates/tinywasm/src/error.rs
index 1d5dbc0..9121e72 100644
--- a/crates/tinywasm/src/error.rs
+++ b/crates/tinywasm/src/error.rs
@@ -40,6 +40,24 @@ pub enum Trap {
 
     /// Integer Overflow
     IntegerOverflow,
+
+    /// Call stack overflow
+    CallStackOverflow,
+}
+
+impl Trap {
+    /// Get the message of the trap
+    pub fn message(&self) -> &'static str {
+        match self {
+            Self::Unreachable => "unreachable",
+            Self::MemoryOutOfBounds { .. } => "memory out of bounds",
+            Self::TableOutOfBounds { .. } => "table out of bounds",
+            Self::DivisionByZero => "division by zero",
+            Self::InvalidConversionToInt => "invalid conversion to int",
+            Self::IntegerOverflow => "integer overflow",
+            Self::CallStackOverflow => "call stack exhausted",
+        }
+    }
 }
 
 #[derive(Debug)]
@@ -105,6 +123,12 @@ pub enum Error {
     },
 }
 
+impl From<Trap> for Error {
+    fn from(value: Trap) -> Self {
+        Self::Trap(value)
+    }
+}
+
 impl Display for Error {
     fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
         match self {
@@ -114,15 +138,14 @@ impl Display for Error {
             #[cfg(feature = "std")]
             Self::Io(err) => write!(f, "I/O error: {}", err),
 
-            Self::Trap(trap) => write!(f, "trap: {:?}", trap),
-
+            Self::Trap(trap) => write!(f, "trap: {}", trap.message()),
+            Self::CallStackEmpty => write!(f, "call stack empty"),
             Self::InvalidLabelType => write!(f, "invalid label type"),
             Self::Other(message) => write!(f, "unknown error: {}", message),
             Self::UnsupportedFeature(feature) => write!(f, "unsupported feature: {}", feature),
             Self::FuncDidNotReturn => write!(f, "function did not return"),
             Self::LabelStackUnderflow => write!(f, "label stack underflow"),
             Self::StackUnderflow => write!(f, "stack underflow"),
-            Self::CallStackEmpty => write!(f, "call stack empty"),
             Self::InvalidStore => write!(f, "invalid store"),
 
             Self::MissingImport { module, name } => {
diff --git a/crates/tinywasm/src/func.rs b/crates/tinywasm/src/func.rs
index 7a6fd1c..e422d25 100644
--- a/crates/tinywasm/src/func.rs
+++ b/crates/tinywasm/src/func.rs
@@ -58,7 +58,7 @@ impl FuncHandle {
 
         // 7. Push the frame f to the call stack
         // & 8. Push the values to the stack (Not needed since the call frame owns the values)
-        stack.call_stack.push(call_frame);
+        stack.call_stack.push(call_frame)?;
 
         // 9. Invoke the function instance
         let runtime = store.runtime();
diff --git a/crates/tinywasm/src/runtime/executor/mod.rs b/crates/tinywasm/src/runtime/executor/mod.rs
index fe27d5a..00ab55e 100644
--- a/crates/tinywasm/src/runtime/executor/mod.rs
+++ b/crates/tinywasm/src/runtime/executor/mod.rs
@@ -53,7 +53,7 @@ impl DefaultRuntime {
                     cf.instr_ptr += 1;
                     // push the call frame back onto the stack so that it can be resumed
                     // if the trap can be handled
-                    stack.call_stack.push(cf);
+                    stack.call_stack.push(cf)?;
                     return Err(Error::Trap(trap));
                 }
             }
@@ -138,8 +138,8 @@ fn exec_one(
 
             // push the call frame
             cf.instr_ptr += 1; // skip the call instruction
-            stack.call_stack.push(cf.clone());
-            stack.call_stack.push(call_frame);
+            stack.call_stack.push(cf.clone())?;
+            stack.call_stack.push(call_frame)?;
 
             // call the function
             return Ok(ExecResult::Call);
@@ -148,7 +148,7 @@ fn exec_one(
         If(args, else_offset, end_offset) => {
             if stack.values.pop_t::<i32>()? == 0 {
                 if let Some(else_offset) = else_offset {
-                    log::info!("entering else at {}", cf.instr_ptr + *else_offset);
+                    log::debug!("entering else at {}", cf.instr_ptr + *else_offset);
                     cf.enter_label(
                         LabelFrame {
                             instr_ptr: cf.instr_ptr + *else_offset,
diff --git a/crates/tinywasm/src/runtime/stack/call_stack.rs b/crates/tinywasm/src/runtime/stack/call_stack.rs
index c4397c2..28ea621 100644
--- a/crates/tinywasm/src/runtime/stack/call_stack.rs
+++ b/crates/tinywasm/src/runtime/stack/call_stack.rs
@@ -1,12 +1,12 @@
-use crate::{runtime::RawWasmValue, BlockType, Error, LabelFrame, Result};
+use crate::{runtime::RawWasmValue, BlockType, Error, LabelFrame, Result, Trap};
 use alloc::{boxed::Box, vec::Vec};
 use tinywasm_types::{ValType, WasmValue};
 
 use super::blocks::Labels;
 
 // minimum call stack size
-const CALL_STACK_SIZE: usize = 1024;
-const CALL_STACK_MAX_SIZE: usize = 1024 * 1024;
+const CALL_STACK_SIZE: usize = 128;
+const CALL_STACK_MAX_SIZE: usize = 1024;
 
 #[derive(Debug)]
 pub(crate) struct CallStack {
@@ -39,15 +39,17 @@ impl CallStack {
     }
 
     #[inline]
-    pub(crate) fn push(&mut self, call_frame: CallFrame) {
+    pub(crate) fn push(&mut self, call_frame: CallFrame) -> Result<()> {
         assert!(self.top <= self.stack.len(), "stack is too small");
-        assert!(
-            self.stack.len() <= CALL_STACK_MAX_SIZE,
-            "call stack size exceeded, this should have been caught"
-        );
+
+        log::info!("stack size: {}", self.stack.len());
+        if self.stack.len() >= CALL_STACK_MAX_SIZE {
+            return Err(Trap::CallStackOverflow.into());
+        }
 
         self.top += 1;
         self.stack.push(call_frame);
+        Ok(())
     }
 }
 
diff --git a/crates/tinywasm/src/store.rs b/crates/tinywasm/src/store.rs
index 936238e..5b644ba 100644
--- a/crates/tinywasm/src/store.rs
+++ b/crates/tinywasm/src/store.rs
@@ -426,11 +426,12 @@ impl TableInstance {
         })?;
 
         if end > self.elements.len() || end < offset {
-            return Err(Error::Trap(crate::Trap::TableOutOfBounds {
+            return Err(crate::Trap::TableOutOfBounds {
                 offset,
                 len: init.len(),
                 max: self.elements.len(),
-            }));
+            }
+            .into());
         }
 
         self.elements[offset..end].copy_from_slice(init);
diff --git a/crates/tinywasm/tests/generated/mvp.csv b/crates/tinywasm/tests/generated/mvp.csv
index 8cf24bd..89fecbd 100644
--- a/crates/tinywasm/tests/generated/mvp.csv
+++ b/crates/tinywasm/tests/generated/mvp.csv
@@ -2,4 +2,4 @@
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+0.3.0-alpha.0,19425,803,[{"name":"address.wast","passed":260,"failed":0},{"name":"align.wast","passed":156,"failed":0},{"name":"binary-leb128.wast","passed":88,"failed":3},{"name":"binary.wast","passed":112,"failed":0},{"name":"block.wast","passed":220,"failed":3},{"name":"br.wast","passed":97,"failed":0},{"name":"br_if.wast","passed":118,"failed":0},{"name":"br_table.wast","passed":171,"failed":3},{"name":"call.wast","passed":75,"failed":16},{"name":"call_indirect.wast","passed":50,"failed":120},{"name":"comments.wast","passed":7,"failed":1},{"name":"const.wast","passed":778,"failed":0},{"name":"conversions.wast","passed":439,"failed":180},{"name":"custom.wast","passed":11,"failed":0},{"name":"data.wast","passed":48,"failed":13},{"name":"elem.wast","passed":69,"failed":30},{"name":"endianness.wast","passed":29,"failed":40},{"name":"exports.wast","passed":92,"failed":4},{"name":"f32.wast","passed":2514,"failed":0},{"name":"f32_bitwise.wast","passed":364,"failed":0},{"name":"f32_cmp.wast","passed":2407,"failed":0},{"name":"f64.wast","passed":2514,"failed":0},{"name":"f64_bitwise.wast","passed":364,"failed":0},{"name":"f64_cmp.wast","passed":2407,"failed":0},{"name":"fac.wast","passed":7,"failed":1},{"name":"float_exprs.wast","passed":900,"failed":0},{"name":"float_literals.wast","passed":163,"failed":0},{"name":"float_memory.wast","passed":90,"failed":0},{"name":"float_misc.wast","passed":437,"failed":4},{"name":"forward.wast","passed":5,"failed":0},{"name":"func.wast","passed":168,"failed":4},{"name":"func_ptrs.wast","passed":9,"failed":27},{"name":"global.wast","passed":94,"failed":16},{"name":"i32.wast","passed":460,"failed":0},{"name":"i64.wast","passed":416,"failed":0},{"name":"if.wast","passed":231,"failed":10},{"name":"imports.wast","passed":50,"failed":133},{"name":"inline-module.wast","passed":1,"failed":0},{"name":"int_exprs.wast","passed":108,"failed":0},{"name":"int_literals.wast","passed":51,"failed":0},{"name":"labels.wast","passed":26,"failed":3},{"name":"left-to-right.wast","passed":92,"failed":4},{"name":"linking.wast","passed":18,"failed":114},{"name":"load.wast","passed":93,"failed":4},{"name":"local_get.wast","passed":36,"failed":0},{"name":"local_set.wast","passed":53,"failed":0},{"name":"local_tee.wast","passed":93,"failed":4},{"name":"loop.wast","passed":116,"failed":4},{"name":"memory.wast","passed":79,"failed":0},{"name":"memory_grow.wast","passed":91,"failed":5},{"name":"memory_redundancy.wast","passed":8,"failed":0},{"name":"memory_size.wast","passed":35,"failed":7},{"name":"memory_trap.wast","passed":182,"failed":0},{"name":"names.wast","passed":484,"failed":2},{"name":"nop.wast","passed":78,"failed":10},{"name":"return.wast","passed":84,"failed":0},{"name":"select.wast","passed":114,"failed":34},{"name":"skip-stack-guard-page.wast","passed":11,"failed":0},{"name":"stack.wast","passed":7,"failed":0},{"name":"start.wast","passed":17,"failed":3},{"name":"store.wast","passed":68,"failed":0},{"name":"switch.wast","passed":28,"failed":0},{"name":"token.wast","passed":57,"failed":1},{"name":"traps.wast","passed":36,"failed":0},{"name":"type.wast","passed":3,"failed":0},{"name":"unreachable.wast","passed":64,"failed":0},{"name":"unreached-invalid.wast","passed":118,"failed":0},{"name":"unwind.wast","passed":50,"failed":0},{"name":"utf8-custom-section-id.wast","passed":176,"failed":0},{"name":"utf8-import-field.wast","passed":176,"failed":0},{"name":"utf8-import-module.wast","passed":176,"failed":0},{"name":"utf8-invalid-encoding.wast","passed":176,"failed":0}]
diff --git a/crates/tinywasm/tests/test-wast.rs b/crates/tinywasm/tests/test-wast.rs
index 42f7091..56bb39e 100644
--- a/crates/tinywasm/tests/test-wast.rs
+++ b/crates/tinywasm/tests/test-wast.rs
@@ -34,7 +34,7 @@ fn main() -> Result<()> {
 }
 
 fn test_wast(wast_file: &str) -> Result<()> {
-    TestSuite::set_log_level(log::LevelFilter::Debug);
+    TestSuite::set_log_level(log::LevelFilter::Info);
 
     let args = std::env::args().collect::<Vec<_>>();
     println!("args: {:?}", args);
diff --git a/crates/tinywasm/tests/testsuite/run.rs b/crates/tinywasm/tests/testsuite/run.rs
index 7a13c3a..6f86edb 100644
--- a/crates/tinywasm/tests/testsuite/run.rs
+++ b/crates/tinywasm/tests/testsuite/run.rs
@@ -7,7 +7,7 @@ use std::{
 use super::TestSuite;
 use eyre::{eyre, Result};
 use log::{debug, error, info};
-use tinywasm::{Extern, Imports, ModuleInstance};
+use tinywasm::{Extern, Imports, ModuleInstance, Trap};
 use tinywasm_types::{MemoryType, ModuleInstanceAddr, TableType, ValType, WasmValue};
 use wast::{lexer::Lexer, parser::ParseBuffer, Wast};
 
@@ -169,6 +169,40 @@ impl TestSuite {
                     );
                 }
 
+                AssertExhaustion { call, message, span } => {
+                    let module = last_module.as_ref();
+                    let name = call.name;
+
+                    let args = call
+                        .args
+                        .into_iter()
+                        .map(wastarg2tinywasmvalue)
+                        .collect::<Result<Vec<_>>>()
+                        .expect("failed to convert args");
+
+                    let res = catch_unwind_silent(|| exec_fn_instance(module, &mut store, name, &args).map(|_| ()));
+
+                    let Ok(Err(tinywasm::Error::Trap(trap))) = res else {
+                        test_group.add_result(
+                            &format!("AssertExhaustion({})", i),
+                            span.linecol_in(wast),
+                            Err(eyre!("expected trap")),
+                        );
+                        continue;
+                    };
+
+                    if trap.message() != message {
+                        test_group.add_result(
+                            &format!("AssertExhaustion({})", i),
+                            span.linecol_in(wast),
+                            Err(eyre!("expected trap: {}", message)),
+                        );
+                        continue;
+                    }
+
+                    test_group.add_result(&format!("AssertExhaustion({})", i), span.linecol_in(wast), Ok(()));
+                }
+
                 AssertTrap { exec, message: _, span } => {
                     let res: Result<tinywasm::Result<()>, _> = catch_unwind_silent(|| {
                         let (module, name, args) = match exec {