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Turn local DWARFContext helpers getFileNameForUnit() and getFileLineI…
…nfoForCompileUnit() into full-blowm DWARFDebugLine::LineTable methods. Summary: getFileNameForUnit() is basically a wrapper around LineTable::getFileNameByIndex(). Fold its additional functionality (adding the DWARFUnit compilation dir) into LineTable::getFileNameByIndex(). getFileLineInfoForCompileUnit() is a wrapper around getFileNameForUnit(). As a function to search the line information by address, it seems natural to put it in the LineTable also. Before this commit only the Context with its private helpers could do Linetable lookups. This newly exposed feature will be used by the DIE dumping code to get access to file information referenced in DIE attributes. This commit has already been partly reviewed in D5192 and contained an additional and a bit controversial 'realpath' call that is left out of this patch. We can reinstate that realpath code later if it is desirable. Test Plan: The patch contains no tests as it should be functionally equivalent to the previous code. As requested in the last review, I checked if the relative path handling copied from the Context to LineTable::getFileNameByIndex() was covered, and indeed the symbolizer tests fail if it is removed. Reviewers: dblaikie, echristo, aprantl, samsonov Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D5354 llvm-svn: 218125
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