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Fix br_table validation (#67) 

Fixes #63

Fix is simple: all labels refered by the br_table instruction must have same value type (or NoResult in case if they don't have result). So we just take the default label and check other labels against it.
This commit is contained in:
Sergey Pepyakin 2018-02-23 18:00:16 +03:00 committed by GitHub
parent 8a96bc2649
commit 7c88c6ad65
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1 changed files with 25 additions and 18 deletions
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43
src/validation/func.rs
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@ -492,32 +492,39 @@ impl Validator {
}
fn validate_br_table(context: &mut FunctionValidationContext, table: &[u32], default: u32) -> Result<InstructionOutcome, Error> {
let mut required_block_type = None;
{
let required_block_type: BlockType = {
let default_block = context.require_label(default)?;
if default_block.frame_type != BlockFrameType::Loop {
required_block_type = Some(default_block.block_type);
}
let required_block_type = if default_block.frame_type != BlockFrameType::Loop {
default_block.block_type
} else {
BlockType::NoResult
};
for label in table {
let label_block = context.require_label(*label)?;
if label_block.frame_type != BlockFrameType::Loop {
if let Some(required_block_type) = required_block_type {
if required_block_type != label_block.block_type {
return Err(Error(format!("Labels in br_table points to block of different types: {:?} and {:?}", required_block_type, label_block.block_type)));
}
}
required_block_type = Some(label_block.block_type);
let label_block_type = if label_block.frame_type != BlockFrameType::Loop {
label_block.block_type
} else {
BlockType::NoResult
};
if required_block_type != label_block_type {
return Err(
Error(
format!(
"Labels in br_table points to block of different types: {:?} and {:?}",
required_block_type,
label_block.block_type
)
)
);
}
}
}
required_block_type
};
context.pop_value(ValueType::I32.into())?;
if let Some(required_block_type) = required_block_type {
if let BlockType::Value(value_type) = required_block_type {
context.tee_value(value_type.into())?;
}
if let BlockType::Value(value_type) = required_block_type {
context.tee_value(value_type.into())?;
}
Ok(InstructionOutcome::Unreachable)