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9d1808f4ad
Summary: This patch reduces file size in debug builds by dropping variable locations a debugger user will not see. After building the debug entity history map we loop through it. For each variable we look at each entry. If the entry opens a location range which does not intersect any of the variable's scope's ranges then we mark it for removal. After visiting the entries for each variable we also mark any clobbering entries which will no longer be referenced for removal, and then finally erase the marked entries. This all requires the ability to query the order of instructions, so before this runs we number them. Tests: Added llvm/test/DebugInfo/X86/trim-var-locs.mir Modified llvm/test/DebugInfo/COFF/register-variables.ll Branch folding merges the tails of if.then and if.else into if.else. Each blocks' debug-locations point to different scopes so when they're merged we can't use either. Because of this the variable 'c' ends up with a location range which doesn't cover any instructions in its scope; with the patch applied the location range is dropped and its flag changes to IsOptimizedOut. Modified llvm/test/DebugInfo/X86/live-debug-variables.ll Modified llvm/test/DebugInfo/ARM/PR26163.ll In both tests an out of scope location is now removed. The remaining location covers the entire scope of the variable allowing us to emit it as a single location. Reviewed By: aprantl Differential Revision: https://reviews.llvm.org/D82129 |
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| .. | ||
| big-endian-bitfield.ll | ||
| big-endian-dump.ll | ||
| bitfield.ll | ||
| call-site-info-output.ll | ||
| cfi-eof-prologue.mir | ||
| constant-dbgloc.ll | ||
| entry-value-multi-byte-expr.ll | ||
| float-args.ll | ||
| float-stack-arg.ll | ||
| header.ll | ||
| illegal-fragment.ll | ||
| line.test | ||
| lit.local.cfg | ||
| little-endian-dump.ll | ||
| lowerbdgdeclare_vla.ll | ||
| multiple-constant-uses-drops-dbgloc.ll | ||
| partial-subreg.ll | ||
| PR16736.ll | ||
| PR26163.ll | ||
| processes-relocations.ll | ||
| prologue_end.ll | ||
| s-super-register.ll | ||
| salvage-debug-info.ll | ||
| sdag-split-arg1.ll | ||
| sdag-split-arg.ll | ||
| selectiondag-deadcode.ll | ||
| single-constant-use-preserves-dbgloc.ll | ||
| split-complex.ll | ||
| sroa-complex.ll | ||
| tls.ll | ||