Add additional round-trip fixes and add additional unit tests for greater code coverage by jkoritzinsky · Pull Request #133188 · dotnet/runtime

jkoritzinsky · 2026-09-03T18:15:22Z

Creating a new PR to replace #131509.

azure-pipelines · 2026-09-03T18:16:14Z

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dotnet-policy-service · 2026-09-03T18:16:46Z

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Copilot

Copilot review overview

🟡 Changes recommended

The CLI normalization refactor currently misclassifies value-taking options (using Option.Name vs aliases), and Options introduces a breaking public member rename that should be made compatible or internal.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Review tier: Lite
Findings: 1 · 1 · 1

New issues introduced by this change (3)

Severity	Finding
	`src/tools/ilasm/src/ilasm/NativeCommandLine.cs` — optionsWithValues is populated with Option.Name (e.g. "output"), but later checked against…
	`src/tools/ilasm/src/ILAssembler/Options.cs` — Options is a public type and this change replaces the existing public IsDll property with Dll.…
	`src/tools/ilasm/tests/ILAssembler.Tests/CommandLineTests.cs` — ModernValueOptions currently includes option.Name in addition to prefixed aliases. In…

What changed in this PR

This PR significantly expands the managed ilasm test suite and adjusts the managed IL assembler, test infrastructure, and CI/configuration to support additional IL round-trip scenarios (including a new managed-ilasm roundtrip), while fixing multiple metadata/PE emission and parsing edge cases uncovered by the added coverage.

Changes:

Add broad ILAssembler unit test coverage across metadata emission (typedefs/typerefs/exports/resources/events/properties/fields), parser robustness, preprocessor integration, and options/CLI behavior.
Update managed ilasm implementation to improve correctness/compatibility for opcode parsing, vararg/signature handling, PrivateScope naming, PE export/vtable fixup emission, and error-tolerant output behavior.
Extend CoreCLR test infrastructure/CI to support managedilasmroundtrip and introduce opt-out markers (ManagedIlasmRoundTripIncompatible) with accompanying documentation.

File	Description
src/tools/ilasm/tests/ILAssembler.Tests/TypeSignatureTests.cs	Adds tests for multi-dimensional array local signature shape decoding.
src/tools/ilasm/tests/ILAssembler.Tests/TypeReferenceTests.cs	Adds tests for typeref resolution scopes, mdtoken/.this/.base/.nester, module-scoped typerefs, and typelist parsing.
src/tools/ilasm/tests/ILAssembler.Tests/TypedefTests.cs	Adds typedef alias coverage for fields and custom attributes (including owner-scoped forms).
src/tools/ilasm/tests/ILAssembler.Tests/TypeDefinitionTests.cs	Adds tests for quoted name segments, class attribute flag behavior, nested types, and interface impl emission.
src/tools/ilasm/tests/ILAssembler.Tests/SyntaxTests.cs	Adds corpus-style tests ensuring malformed/truncated inputs report diagnostics instead of throwing.
src/tools/ilasm/tests/ILAssembler.Tests/SourceDirectiveTests.cs	Strengthens verification of escape processing and adds portable PDB directive coverage across variants/multi-doc scenarios.
src/tools/ilasm/tests/ILAssembler.Tests/SecurityTests.cs	Adds coverage for permissionset syntax variants, emitted DeclSecurity metadata, and error-tolerant behavior.
src/tools/ilasm/tests/ILAssembler.Tests/PropertyTests.cs	Adds tests for property attributes/accessors/custom attributes and indexed property signatures.
src/tools/ilasm/tests/ILAssembler.Tests/PropertyEventTests.cs	New tests validating property/event maps and MethodSemantics emission.
src/tools/ilasm/tests/ILAssembler.Tests/PreprocessorIntegrationTests.cs	New integration tests for includes, conditional compilation, and macro expansion across include levels.
src/tools/ilasm/tests/ILAssembler.Tests/ParameterTests.cs	Adds tests for parameter attribute syntaxes emitting expected flags.
src/tools/ilasm/tests/ILAssembler.Tests/NativeExportTests.cs	New tests validating PE export directory/stub emission and machine-specific stub prefixes.
src/tools/ilasm/tests/ILAssembler.Tests/ModuleTests.cs	Adds tests for `.file` metadata/resources, module refs, bare `.module`, and global method/module attribute + PDB emission.
src/tools/ilasm/tests/ILAssembler.Tests/ManifestResourceTests.cs	New tests for embedded/file/assembly-backed manifest resources and deterministic/error-tolerant behavior.
src/tools/ilasm/tests/ILAssembler.Tests/ILAssembler.Tests.csproj	Adds System.CommandLine dependency and links IlasmRootCommand.cs for CLI parsing tests.
src/tools/ilasm/tests/ILAssembler.Tests/FunctionPointerTests.cs	Switches to signature decoding assertions; adds vararg fnptr sentinel coverage.
src/tools/ilasm/tests/ILAssembler.Tests/FieldTests.cs	Adds tests for trailing custom attribute binding and field attribute flag/null constant emission.
src/tools/ilasm/tests/ILAssembler.Tests/ExportedTypeTests.cs	Adds coverage for ExportedType attributes/implementations/custom attributes and TypeDefId emission.
src/tools/ilasm/tests/ILAssembler.Tests/ExceptionHandlingTests.cs	Adds extensive EH region tests (offset-based, label-based, ordering, filter/fault/finally/catch).
src/tools/ilasm/tests/ILAssembler.Tests/EventTests.cs	Adds event accessor/attribute/other/custom-attr metadata tests and nil-type behavior.
src/tools/ilasm/tests/ILAssembler.Tests/DocumentCompilerTests.cs	New tests ensuring diagnostics have correct document paths and parser errors don’t leak scopes across documents.
src/tools/ilasm/tests/ILAssembler.Tests/DocumentCompilerTestHelpers.cs	Adds shared PEReader compile helper, token operand extraction, and metadata signature decoding provider.
src/tools/ilasm/tests/ILAssembler.Tests/DataTests.cs	Adds coverage for data directives (typed bytes, repeats, large bytearrays, float literals, syntax variants, error isolation).
src/tools/ilasm/tests/ILAssembler.Tests/CompilerOptionsTests.cs	New tests verifying Options-driven PE/metadata behavior, debug attributes, deterministic output, keyfile handling, and error-tolerant output.
src/tools/ilasm/tests/ILAssembler.Tests/CommandLineTests.cs	Updates modern option corpus generation to reflect IlasmRootCommand options (CLI normalization tests).
src/tools/ilasm/tests/ILAssembler.Tests/AssemblyTests.cs	Updates Options property name usage and adds additional assembly reference/identity/attribute parsing tests.
src/tools/ilasm/src/ILAssembler/VTableExportPEBuilder.cs	Fixes COR header vtable directory offset and improves vtable/export directory emission logic (including ordinal gaps).
src/tools/ilasm/src/ILAssembler/PreprocessedTokenSource.cs	Fixes include-stack EOF handling to avoid incorrectly popping the entry source.
src/tools/ilasm/src/ILAssembler/Options.cs	Renames the DLL output option property (public surface) and updates option model.
src/tools/ilasm/src/ILAssembler/NameHelpers.cs	Adds helper to normalize PrivateScope metadata names (strip `$PST` + token suffix).
src/tools/ilasm/src/ILAssembler/MetadataExtensions.cs	Adds ILOpCode.Unused support used by opcode parsing.
src/tools/ilasm/src/ILAssembler/gen/CIL.g4	Fixes token spelling and extends grammar for dotted names, mdtoken forms, unsigned native types, permissionset syntax, and opcode set.
src/tools/ilasm/src/ILAssembler/EntityRegistry.cs	Updates metadata emission behavior (PrivateScope naming, method body encoding heuristics, methodimpl owner, vararg sig rewriting, error-tolerant metadata row preservation).
src/tools/ilasm/src/ILAssembler/DocumentCompiler.cs	Enhances parser error context propagation so the visitor can avoid leaking state across erroneous contexts.
src/tools/ilasm/src/ILAssembler/Diagnostic.cs	Adds a new diagnostic ID/message for constraint owner out-of-range scenarios.
src/tools/ilasm/src/ilasm/Program.cs	Refactors CLI handling to use ParseResult explicitly and wires Normalize() with a single command instance.
src/tools/ilasm/src/ilasm/NativeCommandLine.cs	Refactors CLI normalization to derive supported options from IlasmRootCommand.
src/tools/ilasm/src/ilasm/IlasmRootCommand.cs	Removes embedded SetAction wiring (now configured from Program.Main).
src/tools/ilasm/src/ilasm/ilasm.csproj	Inlines NativeAOT runtime settings previously imported from AotCompilerCommon.props.
src/tests/Loader/classloader/regressions/dev10_403582/gentype.ilproj	Marks the project as incompatible with managed ilasm round-trip.
src/tests/Loader/classloader/regressions/dev10_403582/genmeth.ilproj	Marks the project incompatible with IL round-trip (and documents ildasm crash).
src/tests/Directory.Build.targets	Emits marker files for IlasmRoundTripIncompatible and ManagedIlasmRoundTripIncompatible.
src/tests/Common/CLRTest.Jit.targets	Adds marker-file based skipping and introduces managed-ilasm round-trip selection logic.
src/tests/Common/CLRTest.Execute.targets	Makes IlasmRoundTripIncompatible imply ManagedIlasmRoundTripIncompatible.
src/tests/Common/CLRTest.Execute.Batch.targets	Adds managed-ilasm-only skip logic for batch execution wrapper.
src/tests/Common/CLRTest.Execute.Bash.targets	Adds managed-ilasm-only skip logic for bash execution wrapper.
eng/pipelines/common/templates/runtimes/run-test-job.yml	Adds `managedilasmroundtrip` scenario to ilasm test group.
docs/workflow/testing/coreclr/test-configuration.md	Documents ManagedIlasmRoundTripIncompatible and the implication behavior.
docs/workflow/testing/coreclr/requiresprocessisolation.md	Updates guidance for IL round-trip incompatibility properties and isolation requirements.
docs/workflow/ci/disabling-tests.md	Documents disabling managed vs all ilasm round-trip and notes merged-runner behavior.

Copilot

Copilot review overview

🟡 Changes recommended

The new fat-header forcing logic in EntityRegistry can cause .maxstack-only methods (without .zeroinit) to emit InitLocals, altering semantics/metadata in a way that should be corrected or explicitly justified and locked in with tests.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Review tier: Lite
Findings: 2

New issues introduced by this change (1)

Severity	Finding
	`src/tools/ilasm/src/ILAssembler/EntityRegistry.cs` — `forceFatHeader` triggers when `methodDef.MaxStack < 8` (i.e., `.maxstack` was explicitly…

Pre-existing issues (1)

Severity	Finding
	`src/tools/ilasm/src/ILAssembler/Options.cs` — Options is a public type and this change replaces the existing public IsDll property with Dll.… View comment

Issues resolved since last review (2)

Severity	Finding
	`src/tools/ilasm/tests/ILAssembler.Tests/CommandLineTests.cs` — ModernValueOptions currently includes option.Name in addition to prefixed aliases. In… View resolved comment
	`src/tools/ilasm/src/ilasm/NativeCommandLine.cs` — optionsWithValues is populated with Option.Name (e.g. "output"), but later checked against… View resolved comment

…ing. (#133202) The existing implementation was leading to file lock conflicts on #133188 and other managed ILASM PRs.

Copilot

Copilot review overview

🟡 Changes recommended

There are correctness issues in newly modified code paths (notably CLI normalization validation and method-body header emission) that can contradict the PR’s own tests/expected behavior.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Review tier: Lite
Findings: 4

New issues introduced by this change (2)

Severity	Finding
	`src/tools/ilasm/src/ILAssembler/EntityRegistry.cs` — The fallback body emission also forces `InitLocals` when `forceFatHeader` is true. That can change…
	`src/tools/ilasm/src/ilasm/NativeCommandLine.cs` — `-O:false` / `-g:true` / `-q:true` should be treated as valid modern short-option forms (the unit…

Pre-existing issues (2)

Severity	Finding
	`src/tools/ilasm/src/ILAssembler/EntityRegistry.cs` — `forceFatHeader` triggers when `methodDef.MaxStack < 8` (i.e., `.maxstack` was explicitly… View comment
	`src/tools/ilasm/src/ILAssembler/Options.cs` — Options is a public type and this change replaces the existing public IsDll property with Dll.… View comment

Suppressed comments (2)

src/tools/ilasm/src/ILAssembler/EntityRegistry.cs:387

When forceFatHeader is true, this code forces the InitLocals flag on even if the original IL didn’t request .locals init. That changes emitted method-body semantics/metadata; forcing a fat header should not require changing the InitLocals bit (you already pass hasDynamicStackAllocation || forceFatHeader to avoid a tiny header).

                        MethodBodyAttributes encodingAttributes = methodDef.BodyAttributes;
                        if (forceFatHeader)
                        {
                            encodingAttributes |= MethodBodyAttributes.InitLocals;
                        }

src/tools/ilasm/src/ILAssembler/EntityRegistry.cs:425

This fallback path forces InitLocals when forceFatHeader is true, which can change the emitted method-body header semantics (even for methods that didn’t specify .locals init). It should be possible to keep the original BodyAttributes and rely on hasDynamicStackAllocation || forceFatHeader to force a fat header when needed.

                            localsSigHandle,
                            forceFatHeader ? methodDef.BodyAttributes | MethodBodyAttributes.InitLocals : methodDef.BodyAttributes,
                            hasDynamicStackAllocation: methodDef.HasDynamicStackAllocation || forceFatHeader);

Copilot

Copilot review overview

🔵 Needs a closer look

It spans low-level PE/metadata emission, grammar/parser behavior, test-harness execution logic, and CI scenario expansion, which warrants human validation of compatibility and unintended behavioral changes.

Review tier: Lite
Findings: 4

Pre-existing issues (4)

Severity	Finding
	`src/tools/ilasm/src/ilasm/NativeCommandLine.cs` — `-O:false` / `-g:true` / `-q:true` should be treated as valid modern short-option forms (the unit… View comment
	`src/tools/ilasm/src/ILAssembler/EntityRegistry.cs` — The fallback body emission also forces `InitLocals` when `forceFatHeader` is true. That can change… View comment
	`src/tools/ilasm/src/ILAssembler/EntityRegistry.cs` — `forceFatHeader` triggers when `methodDef.MaxStack < 8` (i.e., `.maxstack` was explicitly… View comment
	`src/tools/ilasm/src/ILAssembler/Options.cs` — Options is a public type and this change replaces the existing public IsDll property with Dll.… View comment

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 806a996a-9fcc-42b7-a902-cac954582b24

Copilot

Copilot review overview

🔵 Needs a closer look

Unresolved correctness issues remain in parser state mutation and 64-bit pointer-size handling.

Review effort: Lite
Findings: 2

Open (2)

ARM32 data-label pointers incorrectly throw instead of using 4-byte fixups
Stale conditional blocks remain after included file EOF

Previously missed (2)

In code that hasn't changed since last review

Support all 64-bit machines in generic pointer sizing

src/tools/ilasm/src/ILAssembler/VTableFixupSupport.cs:45

GetPointerSize is also called while parsing ordinary .data label references, not just vtable exports (for example, GrammarVisitor.VisitDdItem), but this switch only accepts I386, AMD64, and ARM64. BuildImage explicitly treats IA64, LoongArch64, and RiscV64 as supported 64-bit PE machines, so a valid data-label reference with any of those Options.Machine values now throws UnreachableException instead of emitting an 8-byte fixup. Base the switch on GetEffectiveMachine(machine) and include the other supported 64-bit machines (or separate the export-only architecture validation from generic pointer sizing).

Assert nested class declaring type in test

src/tools/ilasm/tests/ILAssembler.Tests/TypeDefinitionTests.cs:807

This only checks that one NestedClass row exists; it never verifies that the row actually associates Inner with Outer, so the test would pass if the emitter wrote the wrong enclosing type. Assert the declaring handle (for example, Assert.Equal(outerHandle, inner.GetDeclaringType())) to validate the behavior claimed by this test.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 806a996a-9fcc-42b7-a902-cac954582b24

Copilot

Copilot review overview

🟡 Changes recommended

Unresolved preprocessor diagnostic duplication and unsupported target-machine handling remain.

Get a fresh assessment by requesting another Copilot review.

Review effort: Lite
Findings: 1 · 1

Open (2)

Support all accepted 64-bit machines in pointer-size handling · New
Prevent duplicate EOF diagnostics across included source boundaries · New

Resolved since last review (2)

ARM32 data-label pointers incorrectly throw instead of using 4-byte fixups
Stale conditional blocks remain after included file EOF

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 806a996a-9fcc-42b7-a902-cac954582b24

Copilot

Copilot review overview

🟡 Changes recommended

Unresolved CLI compatibility, diagnostic span, architecture handling, and round-trip selection issues remain.

Get a fresh assessment by requesting another Copilot review.

Review effort: Lite
Findings: 1

Open (1)

Preserve -h compatibility in modern short option normalization · New

Resolved since last review (2)

Support all accepted 64-bit machines in pointer-size handling
Prevent duplicate EOF diagnostics across included source boundaries

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 806a996a-9fcc-42b7-a902-cac954582b24

jkoritzinsky · 2026-09-29T03:00:57Z

/ba-g SOS failures are #134603, ilasm round trip failures will be fixed by #133622

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Comment thread src/tools/ilasm/src/ilasm/NativeCommandLine.cs Outdated

Comment thread src/tools/ilasm/src/ILAssembler/Options.cs

Comment thread src/tools/ilasm/tests/ILAssembler.Tests/CommandLineTests.cs

This was referenced Sep 3, 2026

Convert AssemblyChecker to use MetadataLoadContext to avoid file locking. #133202

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[ci-scan] Test failure: JitTest_Directed_nullabletypes_gettype.P.BoxedNullableGetType #133207

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HttpMetricsTest_Http20.TimeInQueue_RecordedForNewConnectionsOnly test failure #122522

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Convert AssemblyChecker to use MetadataLoadContext to avoid file lock…

78189fa

…ing. (#133202) The existing implementation was leading to file lock conflicts on #133188 and other managed ILASM PRs.

build-analysis Bot mentioned this pull request Sep 4, 2026

Test failure: GC/Features/HeapExpansion/bestfit-finalize/bestfit-finalize.cmd #132107

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Base automatically changed from ilasm-fixups to main September 9, 2026 16:42

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jkoritzinsky force-pushed the ilasm-more-tests branch from 808dadd to b7476ab Compare September 9, 2026 16:42

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Test failure: SocketBlockingModeTransitionTests.ConnectAsync_WithBuffer_Succeeds fails intermittently on Linux #133012

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Comment thread docs/workflow/ci/disabling-tests.md

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CI failure on Windows: Connection aborted in SocketsHttpHandler_HttpClientHandlerTest.SendAsync_RequestWithLatin1HeaderValue_Succeeds #132004

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Remove ARM32 ilasm target switch

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Fix preprocessor state across included files

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Report unterminated include conditionals

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System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected fails in CI #134528

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Resolve latest ilasm CCR feedback

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Restrict managed ilasm to supported target machines

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build-analysis Bot mentioned this pull request Sep 28, 2026

Crash: access violation in coreclr!PgoManager::getPgoInstrumentationResults during tier-1 background JIT (Windows x86) #134695

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Comment thread src/tools/ilasm/src/ilasm/Program.cs Outdated

Don't reset colors before sending output.

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jkoritzinsky merged commit 0fc86e6 into main Sep 29, 2026
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jkoritzinsky deleted the ilasm-more-tests branch September 29, 2026 03:01

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[main] Source code updates from dotnet/runtime dotnet/dotnet#9845

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