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[DebugInfo] Introduce DW_OP_LLVM_convert
Audit RequiredrL356451

Description

[DebugInfo] Introduce DW_OP_LLVM_convert

Introduce a DW_OP_LLVM_convert Dwarf expression pseudo op that allows
for a convenient way to perform type conversions on the Dwarf expression
stack. As an additional bonus it paves the way for using other Dwarf
v5 ops that need to reference a base_type.

The new DW_OP_LLVM_convert is used from lib/Transforms/Utils/Local.cpp
to perform sext/zext on debug values but mainly the patch is about
preparing terrain for adding other Dwarf v5 ops that need to reference a
base_type.

For Dwarf v5 the op maps to DW_OP_convert and for earlier versions a
complex shift & mask pattern is generated to emulate sext/zext.

This is a recommit of r356442 with trivial fixes for the failing tests.

Differential Revision: https://reviews.llvm.org/D56587

Details

Auditors
grosbach
Committed
markusMar 19 2019, 6:16 AM
Differential Revision
D56587: Introduce DW_OP_LLVM_convert
Parents
rL356450: [OpenCL] Improved testing of default header.
Branches
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Tags
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