go desugar 源码
golang desugar 代码
文件路径：/src/cmd/compile/internal/escape/desugar.go
// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package escape
import (
"cmd/compile/internal/base"
"cmd/compile/internal/ir"
"cmd/compile/internal/typecheck"
"cmd/compile/internal/types"
)
// TODO(mdempsky): Desugaring doesn't belong during escape analysis,
// but for now it's the most convenient place for some rewrites.
// fixRecoverCall rewrites an ORECOVER call into ORECOVERFP,
// adding an explicit frame pointer argument.
// If call is not an ORECOVER call, it's left unmodified.
func fixRecoverCall(call *ir.CallExpr) {
if call.Op() != ir.ORECOVER {
return
}
pos := call.Pos()
// FP is equal to caller's SP plus FixedFrameSize.
var fp ir.Node = ir.NewCallExpr(pos, ir.OGETCALLERSP, nil, nil)
if off := base.Ctxt.Arch.FixedFrameSize; off != 0 {
fp = ir.NewBinaryExpr(fp.Pos(), ir.OADD, fp, ir.NewInt(off))
}
// TODO(mdempsky): Replace *int32 with unsafe.Pointer, without upsetting checkptr.
fp = ir.NewConvExpr(pos, ir.OCONVNOP, types.NewPtr(types.Types[types.TINT32]), fp)
call.SetOp(ir.ORECOVERFP)
call.Args = []ir.Node{typecheck.Expr(fp)}
}
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