[browser] modularize corerun

[pavelsavara]

• rename eng\native.props to eng\native.wasm.targets and add GenerateEmccExports target
  • use GenerateEmccExports the target to calculate EmccExportedRuntimeMethod and EmccExportedFunction
  • to configure CMAKE_EMCC_EXPORTED_RUNTIME_METHODS and CMAKE_EMCC_EXPORTED_FUNCTIONS
  • this needs to be Target otherwise MSBuild doesn't respect ItemGroup/PropertyGroup order
• use CMAKE_EMCC_EXPORTED_RUNTIME_METHODS and CMAKE_EMCC_EXPORTED_FUNCTIONS in corerun and browserhost
  • later we could also use it to create .rsp file for workload re-link
• ES6/harmony modularize corerun.js
  • so that it's guts don't leak to globalThis
  • rename libCorerun.pre.js to libCorerun.extpost.js this changes how selfRun works for corerun
  • use -sNODERAWFS=1 - this also fixes $PATH emscripten module
• implement CallFunc_I32_I32_IND_RetVoid in wasm\callhelpers.cpp
• produce dummy/empty dotnet.diagnostics.js
• fix pinvoke_override names
• fix dealing with pointers bigger than 2GB (negative offset to WASM linear memory)
• implement VFS files loading fetchVfs, installVfsFile
• make browserhost to detect that it's running from NodeJS directly
  • node dotnet.js hello.dll should behave same as dotnet hello.dll
  • this should work even without dotnet.boot.js manifest - self-configure in findResources
  • detect via isNodeHosted
  • self-start in selfHostNodeJS
  • mount host current directory into VFS /managed
• camelCase fixes
• move WeakRef polyfill
• rename PromiseCompletionSource and export more helpers to cross-module exchange
• move and fix RuntimeList so that globalThis.getDotnetRuntime(0) works also for corerun
• implement SystemJS_ConsoleClear
• expose GetDotNetRuntimeContractDescriptor via globalThis.getDotnetRuntime(0).INTERNAL.GetDotNetRuntimeContractDescriptor()
• expose GetDotNetRuntimeHeap via globalThis.getDotnetRuntime(0).INTERNAL.GetDotNetRuntimeHeap(ptr, length)
  • this returns unsigned Module.HEAPU8

[dotnet-policy-service]

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[Copilot]

Pull Request Overview

This PR implements infrastructure for WASM/browser diagnostics support and refactors module initialization, including renaming PromiseController to PromiseCompletionSource, consolidating Emscripten export definitions, and adding support for Virtual File System (VFS) operations.

• Adds new dotnet.diagnostics.js module infrastructure with rollup configuration
• Refactors promise-related APIs from PromiseController to PromiseCompletionSource across the codebase
• Consolidates Emscripten export definitions into a centralized GenerateEmccExports target in native.wasm.targets
• Adds VFS file installation support and runtime registration for corehost browserhost
• Introduces unsigned right-shift operations (>>> 0) for memory safety in pointer operations

Reviewed Changes

Copilot reviewed 47 out of 50 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/native/rollup.config.js	Adds dotnetDiagnosticsJS configuration for new diagnostics module build
src/native/rollup.config.defines.js	Adds fallback default path for StaticLibDestination to support local development
src/native/libs/build-native.proj	Changes import from native.props to native.wasm.targets and adds GenerateEmccExports dependency
src/native/libs/System.Runtime.InteropServices.JavaScript.Native/interop/weak-ref.ts	Adds weak reference utility functions with polyfill fallback for browsers lacking WeakRef support
src/native/libs/System.Runtime.InteropServices.JavaScript.Native/interop/types.ts	Defines WeakRefInternal type extending WeakRef with optional dispose method
src/native/libs/System.Runtime.InteropServices.JavaScript.Native/interop/index.ts	Formatting: adds spacing in function signature
src/native/libs/System.Native.Browser/utils/types.ts	Re-exports types from parent types module
src/native/libs/System.Native.Browser/utils/strings.ts	Adds unsigned right-shift operations for pointer safety
src/native/libs/System.Native.Browser/utils/runtime-list.ts	Implements runtime registry using WeakRef for managing multiple dotnet runtimes on a page
src/native/libs/System.Native.Browser/utils/polyfills.ts	Adds WeakRef polyfill for browsers lacking native support
src/native/libs/System.Native.Browser/utils/memory.ts	Adds unsigned right-shift operations for safe memory access and updates import path
src/native/libs/System.Native.Browser/utils/index.ts	Initializes polyfills, registers runtime and CDAC, adds zeroRegion export
src/native/libs/System.Native.Browser/utils/host.ts	Renames parameter from exit_code to exitCode
src/native/libs/System.Native.Browser/utils/cdac.ts	Registers CDAC (Contract Descriptor for Active Contract) functions to runtime API
src/native/libs/System.Native.Browser/native/timer.ts	Updates to use global functions instead of Module namespace
src/native/libs/System.Native.Browser/native/main.ts	Adds return type annotations and SystemJS_ConsoleClear function
src/native/libs/System.Native.Browser/native/index.ts	Exports SystemJS_ConsoleClear and formatting improvements
src/native/libs/System.Native.Browser/native/cross-linked.ts	Adds _GetDotNetRuntimeContractDescriptor function declaration
src/native/libs/System.Native.Browser/libSystem.Native.Browser.footer.js	Adds GetDotNetRuntimeContractDescriptor to dependencies
src/native/libs/System.Native.Browser/entrypoints.c	Adds SystemJS_ConsoleClear entrypoint
src/native/libs/System.Native.Browser/diagnostics/index.ts	Creates placeholder diagnostics module with dummy export
src/native/libs/Common/JavaScript/types/public-api.ts	Renames parameter from exit_code to exitCode and adds VfsAsset type
src/native/libs/Common/JavaScript/types/internal.ts	Renames PromiseController to PromiseCompletionSource
src/native/libs/Common/JavaScript/types/exchange.ts	Adds exports for debug logging, promise utilities, VFS operations, and zeroRegion
src/native/libs/Common/JavaScript/cross-module/index.ts	Updates table indices after adding debug logger and new loader exports
src/native/libs/Common/JavaScript/cross-linked/index.ts	Adds type annotations, RuntimeExports, and global function declarations
src/native/libs/Common/JavaScript/CMakeLists.txt	Reorganizes source file list and adds new diagnostics, polyfills, and utility files
src/native/corehost/corehost.proj	Changes import and adds GenerateEmccExports and ResolveRuntimeFilesFromLocalBuild dependencies
src/native/corehost/browserhost/sample/CMakeLists.txt	Adds dotnet.diagnostics.js and map file to sample assets
src/native/corehost/browserhost/loader/run.ts	Renames PromiseController to PromiseCompletionSource and adds selfHostNodeJS for Node.js auto-start
src/native/corehost/browserhost/loader/promise-completion-source.ts	Renames from promise-controller.ts with updated symbol and function names
src/native/corehost/browserhost/loader/polyfills.ts	Removes WeakRef polyfill (moved to utils), adds nodeFs/nodeUrl helpers
src/native/corehost/browserhost/loader/logging.ts	Adds debug logging function
src/native/corehost/browserhost/loader/index.ts	Adds debug logger and promise completion source exports to loader exchange
src/native/corehost/browserhost/loader/exit.ts	Renames parameter from exit_code to exitCode
src/native/corehost/browserhost/loader/dotnet.ts	Removes registerRuntime call and adds selfHostNodeJS for auto-start
src/native/corehost/browserhost/loader/dotnet.d.ts	Renames parameter and adds VfsAsset type definition
src/native/corehost/browserhost/loader/bootstrap.ts	Adds findResources, isNodeHosted, isShellHosted functions and VFS fetching support
src/native/corehost/browserhost/libBrowserHost.footer.js	Adds FS and NODEFS dependencies and Node.js filesystem mounting
src/native/corehost/browserhost/host/index.ts	Adds installVfsFile export to browser host exports
src/native/corehost/browserhost/host/host.ts	Implements installVfsFile for creating files in Emscripten virtual filesystem
src/native/corehost/browserhost/browserhost.cpp	Updates library name matching from libSystem.JavaScript to libSystem.JavaScript.Native
src/native/corehost/browserhost/CMakeLists.txt	Refactors to use CMAKE variables for Emscripten exports, adds environment and error limit flags
src/coreclr/vm/wasm/callhelpers.cpp	Adds CallFunc_I32_I32_IND_RetVoid thunk for new call signature
src/coreclr/runtime.proj	Changes import and adds GenerateEmccExports dependency
src/coreclr/hosts/corerun/wasm/libCorerun.pre.js	Removed file (functionality moved to extpost)
src/coreclr/hosts/corerun/wasm/libCorerun.extpost.js	New file implementing corerun initialization as ES6 module
src/coreclr/hosts/corerun/CMakeLists.txt	Switches from pre-js to extern-post-js and uses CMAKE variables for exports
eng/native.wasm.targets	New file consolidating WASM/browser build configuration and Emscripten export generation
eng/native.props	Removed file (moved to native.wasm.targets)