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cmd/cgo: don't cache bad pointer typedefs

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The set of bad pointer typedefs changes as we see more typedefs, so
avoid looking in the cache when we find one.

Fixes #29175

Change-Id: Idd82289bdd8628d11a983fa5ec96517e3a5bcbf1
Reviewed-on: https://go-review.googlesource.com/c/153597
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Ian Lance Taylor 2018-12-11 07:46:10 -08:00
parent f6a163177f
commit 01e072db5d
1 changed files with 14 additions and 4 deletions
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18
src/cmd/cgo/gcc.go
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@ -2177,12 +2177,22 @@ func (c *typeConv) FinishType(pos token.Pos) {
// Type returns a *Type with the same memory layout as
// dtype when used as the type of a variable or a struct field.
func (c *typeConv) Type(dtype dwarf.Type, pos token.Pos) *Type {
// Always recompute bad pointer typedefs, as the set of such
// typedefs changes as we see more types.
checkCache := true
if dtt, ok := dtype.(*dwarf.TypedefType); ok && c.badPointerTypedef(dtt) {
checkCache = false
}
key := dtype.String()
if t, ok := c.m[key]; ok {
if t.Go == nil {
fatalf("%s: type conversion loop at %s", lineno(pos), dtype)
if checkCache {
if t, ok := c.m[key]; ok {
if t.Go == nil {
fatalf("%s: type conversion loop at %s", lineno(pos), dtype)
}
return t
}
return t
}
t := new(Type)