[wasm] Fix R2R stackwalk for inline P/Invoke frames and composite-image RVA base

[lewing]

Summary

Two wasm-only R2R stackwalk correctness fixes, needed once R2R-compiled managed code participates in a stackwalk (exception unwind, GetCallersAssembly, Assembly.Load, GetExecutingAssembly, …).

1. Inline P/Invoke sentinel resolution (stackwalk.cpp, frames.h, helpers.cpp)

An R2R inline P/Invoke InlinedCallFrame carries the sentinel return address INLINED_PINVOKE_FROM_R2R (== 1) instead of a real native address; the real caller virtual IP is derived from m_pCallSiteSP (this infrastructure — the sentinel assignment and InlinedCallFrame::UpdateRegDisplay_Impl — already exists on main). But StackFrameIterator::NextRaw fed that sentinel straight to ProcessIp, which cannot recognize it as managed code, so the same active frame repeated forever — an infinite loop in any stackwalk that crosses an R2R inline-P/Invoke frame.

Resolve the sentinel to the caller virtual IP via GetWasmVirtualIPFromStackPointer before ProcessIp, failing the walk (SWA_FAILED) if the lookup returns null. The sentinel constant moves from a helpers.cpp #define to a typed static constexpr in frames.h so the stack walker can reference it (existing helpers.cpp uses are unchanged semantically).

2. Composite R2R image RVA base (codeman.inl)

JitTokenToModuleRVABase resolved wasm virtual-IP ranges against the IL module base (GetModuleBaseAddress()), which is wrong for a composite R2R (WbIL) image — unwind-frame RVAs decoded against the wrong base. Use the R2R image base (ReadyToRunInfo()->GetImage()->GetBase()), correct for both composite and standalone R2R.

Validation

• WASI CoreCLR build (clr -os wasi -c Release): 0W/0E; stackwalk.cpp/helpers.cpp objects recompile clean.
• Validated end-to-end against minimal Assembly.Load / GetExecutingAssembly R2R repros that previously looped forever in StackFrameIterator.

Note

This PR was authored with the assistance of GitHub Copilot.

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[Copilot]

Pull request overview

This PR makes two WebAssembly-only correctness fixes for ReadyToRun (R2R) stack walking: (1) properly handling the sentinel “return address” used by inline P/Invoke frames in R2R, and (2) using the correct image base when mapping unwind RVAs for composite R2R images.

Changes:

• Resolve the wasm R2R inline-P/Invoke sentinel return address to a real virtual IP before calling ProcessIp during stack walking.
• Move the sentinel constant to a typed static constexpr in frames.h so it’s accessible to stack-walk code.
• Fix wasm JitTokenToModuleRVABase to use the R2R image base (not the IL module base) for RANGE_SECTION_VIRTUALIP sections.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/coreclr/vm/wasm/helpers.cpp	Removes the local macro sentinel definition; continues using the sentinel for active inline P/Invoke frames.
src/coreclr/vm/stackwalk.cpp	Adds wasm-specific handling to translate the inline P/Invoke sentinel to a virtual IP prior to ProcessIp.
src/coreclr/vm/frames.h	Introduces a typed sentinel constant and declares GetWasmVirtualIPFromStackPointer for wasm.
src/coreclr/vm/codeman.inl	Updates wasm virtual-IP RVA base resolution to use the R2R image base address.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.

[lewing]

/ba-g native-aot infra failures are not related