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committedAug 1, 2016
[WebAssembly] Add asm.js-style exception handling support
Summary: This patch includes asm.js-style exception handling support for WebAssembly. The WebAssembly MVP does not have any support for unwinding or non-local control flow. In order to support C++ exceptions, emscripten currently uses JavaScript exceptions along with some support code (written in JavaScript) that is bundled by emscripten with the generated code. This scheme lowers exception-related instructions for wasm such that wasm modules can be compatible with emscripten's existing scheme and share the support code. Patch by Heejin Ahn Differential Revision: https://reviews.llvm.org/D22958 llvm-svn: 277391
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‎llvm/lib/Target/WebAssembly/CMakeLists.txt

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@@ -20,6 +20,7 @@ add_llvm_target(WebAssemblyCodeGen
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WebAssemblyISelLowering.cpp
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WebAssemblyInstrInfo.cpp
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WebAssemblyLowerBrUnless.cpp
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WebAssemblyLowerEmscriptenExceptions.cpp
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WebAssemblyMachineFunctionInfo.cpp
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WebAssemblyMCInstLower.cpp
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WebAssemblyOptimizeLiveIntervals.cpp

‎llvm/lib/Target/WebAssembly/WebAssembly.h

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#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLY_H
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#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLY_H
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#include "llvm/PassRegistry.h"
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#include "llvm/Support/CodeGen.h"
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namespace llvm {
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class WebAssemblyTargetMachine;
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class ModulePass;
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class FunctionPass;
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// LLVM IR passes.
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ModulePass *createWebAssemblyLowerEmscriptenExceptions();
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void initializeWebAssemblyLowerEmscriptenExceptionsPass(PassRegistry &);
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FunctionPass *createWebAssemblyOptimizeReturned();
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// ISel and immediate followup passes.

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