[PATCH] D15001: Extend debug info for function parameters in SDAG.

[Evgeniy Stepanov via llvm-commits]

eugenis created this revision.
eugenis added a reviewer: pcc.
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SDAG currently can emit debug location for function parameters when
an llvm.dbg.declare points to either a function argument SSA temp,
or to an AllocaInst. This change extends this logic by adding a
fallback case when neither of the above is true.

This is required for SafeStack, which may copy the contents of a
byval function argument into something that is not an alloca, and
then describe the target as the new location of the said argument.


Repository:
  rL LLVM

http://reviews.llvm.org/D15001

Files:
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  test/DebugInfo/Generic/safestack-byval.ll

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