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David Stenberg 49e133c5a7 [DebugInfo] Add a DW_OP_LLVM_entry_value operation 
Summary:
Internally in LLVM's metadata we use DW_OP_entry_value operations with
the same semantics as DWARF; that is, its operand specifies the number
of bytes that the entry value covers.

At the time of emitting entry values we don't know the emitted size of
the DWARF expression that the entry value will cover. Currently the size
is hardcoded to 1 in DIExpression, and other values causes the verifier
to fail. As the size is 1, that effectively means that we can only have
valid entry values for registers that can be encoded in one byte, which
are the registers with DWARF numbers 0 to 31 (as they can be encoded as
single-byte DW_OP_reg0..DW_OP_reg31 rather than a multi-byte
DW_OP_regx). It is a bit confusing, but it seems like llvm-dwarfdump
will print an operation "correctly", even if the byte size is less than
that, which may make it seem that we emit correct DWARF for registers
with DWARF numbers > 31. If you instead use readelf for such cases, it
will interpret the number of specified bytes as a DWARF expression. This
seems like a limitation in llvm-dwarfdump.

As suggested in D66746, a way forward would be to add an internal
variant of DW_OP_entry_value, DW_OP_LLVM_entry_value, whose operand
instead specifies the number of operations that the entry value covers,
and we then translate that into the byte size at the time of emission.

In this patch that internal operation is added. This patch keeps the
limitation that a entry value can only be applied to simple register
locations, but it will fix the issue with the size operand being
incorrect for DWARF numbers > 31.

Reviewers: aprantl, vsk, djtodoro, NikolaPrica

Reviewed By: aprantl

Subscribers: jyknight, fedor.sergeev, hiraditya, llvm-commits

Tags: #debug-info, #llvm

Differential Revision: https://reviews.llvm.org/D67492

llvm-svn: 374881
2019-10-15 11:31:21 +00:00
..
AMDGPU AMDGPU: Fix missing immarg for mfma intrinsics 2019-07-16 17:22:21 +00:00
ARM ARM: Fix missing immarg for space intrinsic 2019-07-16 22:41:38 +00:00
Mips [Mips] Remove immarg test for intrinsics that no longer have an immarg after r372409. 2019-09-20 18:52:49 +00:00
SystemZ [SystemZ] Add support for new cpu architecture - arch13 2019-07-12 18:13:16 +00:00
2002-04-13-RetTypes.ll
2002-11-05-GetelementptrPointers.ll
2004-05-21-SwitchConstantMismatch.ll
2006-07-11-StoreStruct.ll
2006-10-15-AddrLabel.ll
2006-12-12-IntrinsicDefine.ll
2007-12-21-InvokeParamAttrs.ll
2008-01-11-VarargAttrs.ll
2008-03-01-AllocaSized.ll
2008-11-15-RetVoid.ll
2009-05-29-InvokeResult1.ll
2009-05-29-InvokeResult2.ll
2009-05-29-InvokeResult3.ll
2010-08-07-PointerIntrinsic.ll
alias.ll
align-md.ll
alloc-size-failedparse.ll
allocsize.ll
AmbiguousPhi.ll
amdgpu-cc.ll
atomics.ll
bitcast-address-space-nested-global-cycle.ll
bitcast-address-space-nested-global.ll
bitcast-address-space-through-constant-inttoptr-inside-gep-instruction.ll
bitcast-address-space-through-constant-inttoptr.ll
bitcast-address-space-through-gep-2.ll
bitcast-address-space-through-gep.ll
bitcast-address-space-through-inttoptr.ll
bitcast-address-spaces.ll
bitcast-alias-address-space.ll
bitcast-pointer-vector-neg.ll
bitcast-vector-pointer-as-neg.ll
bitcast-vector-pointer-as.ll
bitcast-vector-pointer-neg.ll
bitcast-vector-pointer-pos.ll
blockbyref.ll Remove the obsolete BlockByRefStruct flag from LLVM IR 2019-09-18 22:38:56 +00:00
byval-1.ll
byval-4.ll
callbr.ll [Verifier] add invariant check for callbr 2019-09-25 22:28:27 +00:00
callsite-dbgloc.ll
cc-flags.ll
comdat2.ll IR: Disable verifier check for GlobalValues with private linkage named after a comdat for non-COFF. 2019-08-06 21:47:18 +00:00
comdat3.ll
comdat-decl1.ll
comdat-decl2.ll
comdat.ll
commandline-meta1.ll
commandline-meta2.ll
commandline-meta3.ll
commandline-meta4.ll
cttz-undef-arg.ll
dbg-difile-crash.ll
dbg-invalid-compileunit.ll
dbg-invalid-named-metadata.ll
dbg-invalid-retaintypes.ll
dbg-invalid-vector.ll
dbg-line-without-file.ll
dbg-null-retained-type.ll
dbg-orphaned-compileunit.ll
dbg-typerefs.ll
dbg.ll
deoptimize-intrinsic.ll
dereferenceable-md-inttoptr.ll [IR][Verifier] Allow IntToPtrInst to be !dereferenceable 2019-07-23 17:19:56 +00:00
dereferenceable-md.ll [IR][Verifier] Allow IntToPtrInst to be !dereferenceable 2019-07-23 17:19:56 +00:00
di-subroutine-localvar.ll
diderivedtype-address-space-atomic-type.ll
diderivedtype-address-space-const-type.ll
diderivedtype-address-space-friend.ll
diderivedtype-address-space-inheritance.ll
diderivedtype-address-space-member.ll
diderivedtype-address-space-ptr-to-member-type.ll
diderivedtype-address-space-restrict-type.ll
diderivedtype-address-space-rvalue-reference-type.ll
diderivedtype-address-space-typedef.ll
diderivedtype-address-space-volatile-type.ll
diexpression-dwarf-entry-value.ll [DebugInfo] Add a DW_OP_LLVM_entry_value operation 2019-10-15 11:31:21 +00:00
diexpression-entry-value-llvm-ir.ll [DebugInfo] Add a DW_OP_LLVM_entry_value operation 2019-10-15 11:31:21 +00:00
diexpression-entry-value.ll [DebugInfo] Add a DW_OP_LLVM_entry_value operation 2019-10-15 11:31:21 +00:00
diexpression-swap.ll
diexpression-valid-entry-value.ll [DebugInfo] Add a DW_OP_LLVM_entry_value operation 2019-10-15 11:31:21 +00:00
DIFile.ll
diglobalvariable.ll
DILocation-parents.ll
DILocation-scope.ll
DISubprogram.ll
dominates.ll
element-wise-atomic-memory-intrinsics.ll
fnarg-debuginfo.ll
fnarg-nodebug.ll
fp-intrinsics.ll [FPEnv] Strict FP tests should use the requisite function attributes. 2019-10-04 17:03:46 +00:00
fpmath.ll
fragment.ll
frameescape.ll
func-dbg.ll
function-metadata-bad.ll
function-metadata-good.ll
gc_relocate_addrspace.ll
gc_relocate_operand.ll
gc_relocate_return.ll
gcread-ptrptr.ll
gcroot.ll
gcwrite-ptrptr.ll
global-ctors-2.ll
global-ctors.ll
guard-intrinsic.ll
ident-meta1.ll
ident-meta2.ll
ident-meta3.ll
ident-meta4.ll
immarg-param-attribute-invalid.ll
inalloca1.ll
inalloca2.ll
inalloca3.ll
inalloca-vararg.ll
intrinsic-arg-overloading-struct-ret.ll Test forward references in IntrinsicEmitter on Neon LD(2|3|4) 2019-06-17 12:01:53 +00:00
intrinsic-bad-arg-type.ll [IntrinsicEmitter] Support scalable vectors in intrinsics 2019-08-27 12:57:09 +00:00
intrinsic-immarg.ll [Intrinsic] Add the llvm.umul.fix.sat intrinsic 2019-09-07 12:16:14 +00:00
invalid-disubrange-count-node.ll
invalid-eh.ll
invalid-statepoint2.ll
invalid-statepoint.ll
invoke.ll
jumptable.ll
llvm.compiler_used-invalid-type.ll
llvm.dbg.declare-address.ll
llvm.dbg.declare-expression.ll
llvm.dbg.declare-variable.ll
llvm.dbg.intrinsic-dbg-attachment.ll
llvm.dbg.value-expression.ll
llvm.dbg.value-value.ll
llvm.dbg.value-variable.ll
llvm.loop.ll Add debug location verification for !llvm.loop attachments. 2019-06-18 20:09:09 +00:00
llvm.used-invalid-init2.ll
llvm.used-invalid-init.ll
llvm.used-invalid-type2.ll
llvm.used-invalid-type.ll
llvm.used-ptr-type.ll
masked-load.ll
masked-store.ll
mdcompositetype-templateparams-tuple.ll
mdcompositetype-templateparams.ll
memcpy.ll
metadata-function-dbg.ll [IR] Add DISuprogram and DIE for a func decl 2019-06-27 06:07:41 +00:00
metadata-function-prof.ll
module-flags-1.ll
module-flags-2.ll
module-flags-3.ll
module-flags-cgprofile.ll
musttail-invalid.ll
musttail-valid.ll
non-integer-gep-index.ll
non-integer-gep-index.ll.bc
non-integral-pointers.ll
operand-bundles.ll
PhiGrouping.ll
pr34325.ll
range-1.ll
range-2.ll
README.txt
recursive-struct-param.ll
recursive-type-1.ll
recursive-type-2.ll
recursive-type-3.ll
resume.ll
scalable-global-vars.ll Scalable Vector IR Type with further LTO fixes 2019-07-05 12:48:16 +00:00
scatter_gather.ll
SelfReferential.ll
speculatable-callsite-invalid.ll
speculatable-callsite.ll
sret.ll
statepoint.ll
swifterror2.ll
swifterror3.ll
swifterror.ll
swiftself.ll
tbaa-allowed.ll
tbaa.ll
token1.ll
token2.ll
token3.ll
token4.ll
token5.ll
token6.ll
token7.ll
unsized-types.ll
varargs-intrinsic.ll
variant-part.ll
writeonly.ll

README.txt 

This directory contains testcases that the verifier is supposed to detect as
malformed LLVM code.  Testcases for situations that the verifier incorrectly
identifies as malformed should go in the test/Assembler directory.