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| 1 | namespace IR.Values.Load is | |
| 2 | use IO.Std | |
| 3 | ||
| 4 | use System.NotImplementedException | |
| 5 | use System.Text.StringBuilder | |
| 6 | ||
| 7 | use TypeTyped = Semantic.Types.Typed | |
| 8 | use Semantic.Types.Type | |
| 9 | use SymbolBase = Semantic.Symbols.Symbol | |
| 10 | ||
| 11 | // The cast to the symbol's expected kind is a checked construction | |
| 12 | // invariant: the caller only ever builds this value with a symbol of | |
| 13 | // that kind, so a throw here means the invariant broke elsewhere. | |
| 14 | @suppress("cast-may-throw") | |
| 15 | class FUNCTION_POINTER: SYMBOL, TypeTyped is | |
| 16 | has_address: bool => false | |
| 17 | is_consumable: bool => true | |
| 18 | ||
| 19 | // True when this pointer must dispatch virtually - a real | |
| 20 | // override could sit behind the statically-known symbol at | |
| 21 | // the receiver's runtime type, and a plain `ldftn` always | |
| 22 | // captures the statically-resolved implementation. Only ever | |
| 23 | // true for a function reference bound to a live receiver | |
| 24 | // (FUNCTION_REFERENCE_RESOLVER); a closure's own synthesized | |
| 25 | // method is never virtual, so every other caller passes false. | |
| 26 | is_virtual: bool | |
| 27 | is_virtual_dispatch: bool => is_virtual | |
| 28 | ||
| 29 | init(symbol: Semantic.Symbols.Symbol) is | |
| 30 | init(symbol, false) | |
| 31 | si | |
| 32 | ||
| 33 | init(symbol: Semantic.Symbols.Symbol, is_virtual: bool) is | |
| 34 | super.init(null, symbol) | |
| 35 | ||
| 36 | self.is_virtual = is_virtual | |
| 37 | si | |
| 38 | ||
| 39 | referenced_function: Semantic.Symbols.Function? => | |
| 40 | cast Semantic.Symbols.Function?(symbol) | |
| 41 | ||
| 42 | gen(context: IR.CONTEXT) is | |
| 43 | let opcode = if is_virtual then "ldvirtftn" else "ldftn" fi | |
| 44 | ||
| 45 | let body = context.current_srm_body_emitter! | |
| 46 | let target = context.resolve_call_target(cast Semantic.Symbols.Function(symbol)) | |
| 47 | ||
| 48 | if is_virtual then | |
| 49 | body.load_virtual_function_pointer(target) | |
| 50 | else | |
| 51 | body.load_function_pointer(target) | |
| 52 | fi | |
| 53 | si | |
| 54 | ||
| 55 | to_string() -> string => | |
| 56 | "function:[{type}](\"{symbol.name}\")" | |
| 57 | si | |
| 58 | si |