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[llgo] debug: create replaceable type through DIBuilder

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Summary:
llgo was asserting in DebugInfo, which was interpreting
the temporary MDNodes we were creating as DIScopes instead
of DITypes (in DIScope::getRef).

This proposal changes llgo to use DIBuilder's
createReplaceableCompositeType method to create a DIType
that can be RAUW'd.

Reviewers: pcc

Reviewed By: pcc

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D7852

llvm-svn: 230953
This commit is contained in:
Andrew Wilkins 2015-03-02 12:42:45 +00:00
parent 0a6ce9f4e1
commit ac15169034
1 changed files with 12 additions and 4 deletions
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16
llgo/debug/debug.go
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@ -340,18 +340,26 @@ func (d *DIBuilder) descriptorStruct(t *types.Struct, name string) llvm.Metadata
}
func (d *DIBuilder) descriptorNamed(t *types.Named) llvm.Metadata {
// Create a placeholder for the named type, to terminate cycles.
placeholder := llvm.GlobalContext().TemporaryMDNode(nil)
d.types.Set(t, placeholder)
var diFile llvm.Metadata
var line int
if file := d.fset.File(t.Obj().Pos()); file != nil {
line = file.Line(t.Obj().Pos())
diFile = d.getFile(file)
}
// Create a placeholder for the named type, to terminate cycles.
name := t.Obj().Name()
placeholder := d.builder.CreateReplaceableCompositeType(d.scope(), llvm.DIReplaceableCompositeType{
Tag: dwarf.TagStructType,
Name: name,
File: diFile,
Line: line,
})
d.types.Set(t, placeholder)
typedef := d.builder.CreateTypedef(llvm.DITypedef{
Type: d.DIType(t.Underlying()),
Name: t.Obj().Name(),
Name: name,
File: diFile,
Line: line,
})