[llvm-dev] StructType --> DICompositeType?

[Troy Johnson via llvm-dev]

Is there a more convenient way to obtain a DIType given a Type than matching up the strings for the names?


For example, given:


struct S {
  int x, y;
} s;

void foo(S *a) {
  a->x = 0;
  a->y = 1;
}


There are DIType nodes for the struct Type:


!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "S", file: !3, line: 1, size: 64, flags: DIFlagTypePassByValue, elements: !7, identifier: "_ZTS1S")
!7 = !{!8, !10}
!8 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !6, file: !3, line: 2, baseType: !9, size: 32)
!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!10 = !DIDerivedType(tag: DW_TAG_member, name: "y", scope: !6, file: !3, line: 2, baseType: !9, size: 32, offset: 32)


but given just the StructType for S there is no direct way to get to the DICompositeType.  I've made something work by prescanning all the DITypes in my Module and creating a map that uses type names as the key, being careful to strip "struct." prefixes and maintain scoping for nested structs (e.g., S1::S2), which works, but seems awfully complicated to need to do.


Seems like StructType should have a getMetaData() function, but I don't see one.


-Troy

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