| //===- closures.go - IR generation for closures ---------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements IR generation for closures. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| package irgen |
| |
| import ( |
| "llvm.org/llgo/third_party/gotools/go/types" |
| ) |
| |
| // makeClosure creates a closure from a function pointer and |
| // a set of bindings. The bindings are addresses of captured |
| // variables. |
| func (fr *frame) makeClosure(fn *govalue, bindings []*govalue) *govalue { |
| govalues := append([]*govalue{fn}, bindings...) |
| fields := make([]*types.Var, len(govalues)) |
| for i, v := range govalues { |
| field := types.NewField(0, nil, "_", v.Type(), false) |
| fields[i] = field |
| } |
| block := fr.createTypeMalloc(types.NewStruct(fields, nil)) |
| for i, v := range govalues { |
| addressPtr := fr.builder.CreateStructGEP(block, i, "") |
| fr.builder.CreateStore(v.value, addressPtr) |
| } |
| closure := fr.builder.CreateBitCast(block, fn.value.Type(), "") |
| return newValue(closure, fn.Type()) |
| } |