Preserve document custom debug information#495
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Load custom debug information for every preserved portable PDB document so embedded sources survive a round trip. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 01ec6ff9-132e-45df-95c2-9cedbce405cb Assisted-by: GitHub Copilot CLI:GPT-5.6-Sol [code-review]
Read missing document custom debug information only when producing a portable PDB, and verify embedded sources survive after their sequence points are trimmed. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 01ec6ff9-132e-45df-95c2-9cedbce405cb Assisted-by: GitHub Copilot CLI:GPT-5.6-Sol [code-review]
akoeplinger
approved these changes
Jul 24, 2026
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Fixes dotnet/runtime#115145.
Portable PDB documents are preserved even when they are no longer referenced by sequence points, but their custom debug information was only loaded when resolving a referenced document. Consequently, documents left unreferenced after trimming could be written without records such as
EmbeddedSource.Before writing the complete document collection, load custom debug information for documents that have not already been resolved. This keeps read-only PDB usage lazy while ensuring all document records are preserved during a rewrite. Embedded-source content remains lazy and is copied from its original raw blob when written.
The regression test removes the entry point and types containing a document’s sequence points without first accessing their debug information, writes the module, and verifies the output PDB still contains that document’s embedded source.
Testing
dotnet test Test/Mono.Cecil.Tests.csproj --filter FullyQualifiedName~PortablePdbTests(36 passed)dotnet test Test/Mono.Cecil.Tests.csproj(355 passed, 3 skipped)Note
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