Method getInvokeFunction

compiler/interface.go:903–922

getInvokeFunction returns the thunk to call the given interface method. The thunk is declared, not defined: it will be defined by the interface lowering pass.

(instr *ssa.CallCommon)

// thunk is declared, not defined: it will be defined by the interface lowering
// pass.
func (c *compilerContext) getInvokeFunction(instr *ssa.CallCommon) llvm.Value {
	s, _ := getTypeCodeName(instr.Value.Type().Underlying())
	fnName := s + "." + instr.Method.Name() + "$invoke"
	llvmFn := c.mod.NamedFunction(fnName)
	if llvmFn.IsNil() {
		sig := instr.Method.Type().(*types.Signature)
		var paramTuple []*types.Var
		for i := 0; i < sig.Params().Len(); i++ {
			paramTuple = append(paramTuple, sig.Params().At(i))
		}
		paramTuple = append(paramTuple, types.NewVar(token.NoPos, nil, "$typecode", types.Typ[types.UnsafePointer]))
		llvmFnType := c.getLLVMFunctionType(types.NewSignature(sig.Recv(), types.NewTuple(paramTuple...), sig.Results(), false))
		llvmFn = llvm.AddFunction(c.mod, fnName, llvmFnType)
		c.addStandardDeclaredAttributes(llvmFn)
		llvmFn.AddFunctionAttr(c.ctx.CreateStringAttribute("tinygo-invoke", c.getMethodSignatureName(instr.Method)))
		methods := c.getMethodsString(instr.Value.Type().Underlying().(*types.Interface))
		llvmFn.AddFunctionAttr(c.ctx.CreateStringAttribute("tinygo-methods", methods))
	}
	return llvmFn
}

// createInterfaceTypeAssert creates a call to a declared-but-not-defined
// $typeassert function for the given interface. This function will be defined