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