[PATCH] D21808: [WebAssembly] Handle debug information and virtual registers without crashing

[Dominic Chen via llvm-commits]

ddcc created this revision.
ddcc added reviewers: jfb, sunfish, dschuff.
ddcc added a subscriber: llvm-commits.
Herald added subscribers: dschuff, jfb, MatzeB.

Currently, enabling debug information when compiling for WebAssembly crashes the backend in multiple places. This commit fixes these by skipping virtual registers when computing history of DBG_VALUEs, skipping DBG_VALUEs when computing live intervals, and handling DBG_VALUEs correctly in backend passes.

http://reviews.llvm.org/D21808

Files:
  lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp
  lib/CodeGen/LiveIntervalAnalysis.cpp
  lib/CodeGen/LiveRangeCalc.cpp
  lib/Target/WebAssembly/WebAssemblyRegStackify.cpp
  lib/Target/WebAssembly/WebAssemblyStoreResults.cpp
  test/DebugInfo/WebAssembly/live-intervals.ll
  test/DebugInfo/WebAssembly/variable.ll
  test/DebugInfo/WebAssembly/wasm-reg-stackify.ll
  test/DebugInfo/WebAssembly/wasm-store-results.ll

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