llvm-project

4f047bc5 - [DLCov] Origin-Tracking: Collect stack traces in DebugLoc (#146678)

[DLCov] Origin-Tracking: Collect stack traces in DebugLoc (#146678) This patch is part of a series that adds origin-tracking to the debugify source location coverage checks, allowing us to report symbolized stack traces of the point where missing source locations appear. This patch adds the logic for collecting stack traces in DebugLoc instances. We do not symbolize the stack traces in this patch - that only happens when we decide to actually print them, which will be the responsibility of debugify. The collection happens in the constructor of a DebugLoc that has neither a valid location nor an annotation; we also collect an extra stack trace every time we call setDebugLoc, as sometimes the more interesting point is not where the DebugLoc was constructed, but where it was applied to an instruction. This takes the form of a getCopied() method on DebugLoc, which is the identity function in normal builds, but adds an extra stack trace in origin-tracking builds.