DI: Reverse direction of subprogram -> function edge.
authorPeter Collingbourne <peter@pcc.me.uk>
Thu, 5 Nov 2015 22:03:56 +0000 (22:03 +0000)
committerPeter Collingbourne <peter@pcc.me.uk>
Thu, 5 Nov 2015 22:03:56 +0000 (22:03 +0000)
commitd4bff30370db9f2cb13838897012768739cf1ee0
treef6c80f666794291c78575617d326207f57939b61
parent18da38edb315fe9e063348c4d785b26111b6d7ec
DI: Reverse direction of subprogram -> function edge.

Previously, subprograms contained a metadata reference to the function they
described. Because most clients need to get or set a subprogram for a given
function rather than the other way around, this created unneeded inefficiency.

For example, many passes needed to call the function llvm::makeSubprogramMap()
to build a mapping from functions to subprograms, and the IR linker needed to
fix up function references in a way that caused quadratic complexity in the IR
linking phase of LTO.

This change reverses the direction of the edge by storing the subprogram as
function-level metadata and removing DISubprogram's function field.

Since this is an IR change, a bitcode upgrade has been provided.

Fixes PR23367. An upgrade script for textual IR for out-of-tree clients is
attached to the PR.

Differential Revision: http://reviews.llvm.org/D14265

llvm-svn: 252219
400 files changed:
llvm/bindings/go/llvm/DIBuilderBindings.cpp
llvm/bindings/go/llvm/DIBuilderBindings.h
llvm/bindings/go/llvm/IRBindings.cpp
llvm/bindings/go/llvm/IRBindings.h
llvm/bindings/go/llvm/dibuilder.go
llvm/bindings/go/llvm/ir.go
llvm/include/llvm/IR/DIBuilder.h
llvm/include/llvm/IR/DebugInfo.h
llvm/include/llvm/IR/DebugInfoMetadata.h
llvm/lib/AsmParser/LLParser.cpp
llvm/lib/Bitcode/Reader/BitcodeReader.cpp
llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
llvm/lib/CodeGen/LiveDebugVariables.cpp
llvm/lib/IR/AsmWriter.cpp
llvm/lib/IR/DIBuilder.cpp
llvm/lib/IR/DebugInfo.cpp
llvm/lib/IR/DebugInfoMetadata.cpp
llvm/lib/IR/LLVMContextImpl.h
llvm/lib/IR/Verifier.cpp
llvm/lib/Linker/LinkModules.cpp
llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
llvm/lib/Transforms/IPO/StripSymbols.cpp
llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
llvm/lib/Transforms/Utils/CloneFunction.cpp
llvm/test/Assembler/2010-02-05-FunctionLocalMetadataBecomesNull.ll
llvm/test/Assembler/disubprogram.ll
llvm/test/Assembler/drop-debug-info.ll
llvm/test/Bitcode/upgrade-subprogram.ll [new file with mode: 0644]
llvm/test/Bitcode/upgrade-subprogram.ll.bc [new file with mode: 0644]
llvm/test/CodeGen/AArch64/aarch64-2014-08-11-MachineCombinerCrash.ll
llvm/test/CodeGen/AMDGPU/llvm.dbg.value.ll
llvm/test/CodeGen/ARM/2010-08-04-StackVariable.ll
llvm/test/CodeGen/ARM/2011-01-19-MergedGlobalDbg.ll
llvm/test/CodeGen/ARM/2011-08-02-MergedGlobalDbg.ll
llvm/test/CodeGen/ARM/coalesce-dbgvalue.ll
llvm/test/CodeGen/ARM/debug-frame-vararg.ll
llvm/test/CodeGen/ARM/debug-frame.ll
llvm/test/CodeGen/ARM/debug-info-arg.ll
llvm/test/CodeGen/ARM/debug-info-blocks.ll
llvm/test/CodeGen/ARM/debug-info-branch-folding.ll
llvm/test/CodeGen/ARM/debug-info-d16-reg.ll
llvm/test/CodeGen/ARM/debug-info-no-frame.ll
llvm/test/CodeGen/ARM/debug-info-qreg.ll
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llvm/test/CodeGen/ARM/debug-info-sreg2.ll
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llvm/test/CodeGen/MIR/X86/instructions-debug-location.mir
llvm/test/CodeGen/MIR/X86/metadata-operands.mir
llvm/test/CodeGen/MIR/X86/unknown-metadata-node.mir
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llvm/test/CodeGen/X86/2010-05-25-DotDebugLoc.ll
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llvm/test/DebugInfo/AArch64/dwarfdump.ll
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llvm/test/DebugInfo/ARM/header.ll
llvm/test/DebugInfo/ARM/lowerbdgdeclare_vla.ll
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