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26b66fd60b
Move Flag, Debug, Ctxt, Exit, and error messages to
new package cmd/compile/internal/base.
These are the core functionality that everything in gc uses
and which otherwise prevent splitting any other code
out of gc into different packages.
A minor milestone: the compiler source code
no longer contains the string "yy".
[git-generate]
cd src/cmd/compile/internal/gc
rf '
mv atExit AtExit
mv Ctxt atExitFuncs AtExit Exit base.go
mv lineno Pos
mv linestr FmtPos
mv flusherrors FlushErrors
mv yyerror Errorf
mv yyerrorl ErrorfAt
mv yyerrorv ErrorfVers
mv noder.yyerrorpos noder.errorAt
mv Warnl WarnfAt
mv errorexit ErrorExit
mv base.go debug.go flag.go print.go cmd/compile/internal/base
'
: # update comments
sed -i '' 's/yyerrorl/ErrorfAt/g; s/yyerror/Errorf/g' *.go
: # bootstrap.go is not built by default so invisible to rf
sed -i '' 's/Fatalf/base.Fatalf/' bootstrap.go
goimports -w bootstrap.go
: # update cmd/dist to add internal/base
cd ../../../dist
sed -i '' '/internal.amd64/a\
"cmd/compile/internal/base",
' buildtool.go
gofmt -w buildtool.go
Change-Id: I59903c7084222d6eaee38823fd222159ba24a31a
Reviewed-on: https://go-review.googlesource.com/c/go/+/272250
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
78 lines
1.9 KiB
Go
78 lines
1.9 KiB
Go
// Copyright 2009 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 gc
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import "cmd/compile/internal/base"
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// evalunsafe evaluates a package unsafe operation and returns the result.
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func evalunsafe(n *Node) int64 {
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switch n.Op {
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case OALIGNOF, OSIZEOF:
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n.Left = typecheck(n.Left, ctxExpr)
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n.Left = defaultlit(n.Left, nil)
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tr := n.Left.Type
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if tr == nil {
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return 0
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}
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dowidth(tr)
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if n.Op == OALIGNOF {
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return int64(tr.Align)
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}
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return tr.Width
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case OOFFSETOF:
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// must be a selector.
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if n.Left.Op != OXDOT {
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base.Errorf("invalid expression %v", n)
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return 0
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}
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// Remember base of selector to find it back after dot insertion.
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// Since r->left may be mutated by typechecking, check it explicitly
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// first to track it correctly.
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n.Left.Left = typecheck(n.Left.Left, ctxExpr)
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sbase := n.Left.Left
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n.Left = typecheck(n.Left, ctxExpr)
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if n.Left.Type == nil {
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return 0
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}
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switch n.Left.Op {
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case ODOT, ODOTPTR:
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break
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case OCALLPART:
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base.Errorf("invalid expression %v: argument is a method value", n)
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return 0
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default:
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base.Errorf("invalid expression %v", n)
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return 0
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}
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// Sum offsets for dots until we reach sbase.
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var v int64
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for r := n.Left; r != sbase; r = r.Left {
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switch r.Op {
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case ODOTPTR:
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// For Offsetof(s.f), s may itself be a pointer,
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// but accessing f must not otherwise involve
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// indirection via embedded pointer types.
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if r.Left != sbase {
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base.Errorf("invalid expression %v: selector implies indirection of embedded %v", n, r.Left)
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return 0
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}
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fallthrough
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case ODOT:
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v += r.Xoffset
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default:
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Dump("unsafenmagic", n.Left)
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base.Fatalf("impossible %#v node after dot insertion", r.Op)
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}
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}
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return v
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}
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base.Fatalf("unexpected op %v", n.Op)
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return 0
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}
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