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Implement Phase 9.7: ExternCall instruction and WASM runtime imports

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Co-authored-by: moe-charm <217100418+moe-charm@users.noreply.github.com>
This commit is contained in:
copilot-swe-agent[bot]
2025-08-14 08:56:39 +00:00
parent 9b25330d94
commit 2091462441
9 changed files with 318 additions and 3 deletions
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32
src/backend/wasm/codegen.rs
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@ -371,6 +371,38 @@ impl WasmCodegen {
])
},
// Phase 9.7: External Function Calls
MirInstruction::ExternCall { dst, iface_name, method_name, args, effects: _ } => {
// Generate call to external function import
let call_target = match (iface_name.as_str(), method_name.as_str()) {
("env.console", "log") => "console_log",
("env.canvas", "fillRect") => "canvas_fillRect",
("env.canvas", "fillText") => "canvas_fillText",
_ => return Err(WasmError::UnsupportedInstruction(
format!("Unsupported extern call: {}.{}", iface_name, method_name)
)),
};
let mut instructions = Vec::new();
// Load all arguments onto stack in order
for arg in args {
instructions.push(format!("local.get ${}", self.get_local_index(*arg)?));
}
// Call the external function
instructions.push(format!("call ${}", call_target));
// Store result if destination is provided
if let Some(dst) = dst {
// For void functions, we still need to provide a dummy value
instructions.push("i32.const 0".to_string()); // Void result
instructions.push(format!("local.set ${}", self.get_local_index(*dst)?));
}
Ok(instructions)
},
// Unsupported instructions
_ => Err(WasmError::UnsupportedInstruction(
format!("Instruction not yet supported: {:?}", instruction)