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debuginfo: Added description of algorithm for handling recursive types.

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Also fixed nasty bug caused by calling LLVMDIBuilderCreateStructType() with a null pointer where an empty array was expected (which would trigger an unintelligable assertion somewhere down the line).
This commit is contained in:
Michael Woerister 2013-09-13 16:26:35 +02:00
parent 1ce02e7144
commit ccb721a58d
4 changed files with 71 additions and 111 deletions
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10
src/test/debug-info/recursive-struct.rs
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@ -142,14 +142,14 @@ struct LongCycleWithAnonymousTypes {
// This test case makes sure that recursive structs are properly described. The Node structs are
// generic so that we can have a new type (that newly needs to be described) for the different
// cases. The potential problem with recursive types is that the DI generation algorithm get trapped
// in an endless loop. To make sure, we actually test this in the different cases, we have to
// operate on a new type each time, otherwise we would just hit the DI cache for all but the first
// case.
// cases. The potential problem with recursive types is that the DI generation algorithm gets
// trapped in an endless loop. To make sure, we actually test this in the different cases, we have
// to operate on a new type each time, otherwise we would just hit the DI cache for all but the
// first case.
// The different cases below (stack_*, unique_*, box_*, etc) are set up so that the type description
// algorithm will enter the type reference cycle that is created by a recursive definition from a
// different context.
// different context each time.
// The "long cycle" cases are constructed to span a longer, indirect recursion cycle between types.
// The different locals will cause the DI algorithm to enter the type reference cycle at different