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Update docs for accessing !dbg attachments 

llvm-svn: 244238
This commit is contained in:
Duncan P. N. Exon Smith 2015-08-06 18:15:25 +00:00
parent 14c3c4bb85
commit f032c956de
1 changed files with 5 additions and 6 deletions
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11
llvm/docs/SourceLevelDebugging.rst
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@ -368,15 +368,14 @@ C/C++ source file information
``llvm::Instruction`` provides easy access to metadata attached with an
instruction. One can extract line number information encoded in LLVM IR using
``Instruction::getMetadata()`` and ``DILocation::getLineNumber()``.
``Instruction::getDebugLoc()`` and ``DILocation::getLine()``.
.. code-block:: c++
if (MDNode *N = I->getMetadata("dbg")) { // Here I is an LLVM instruction
DILocation Loc(N); // DILocation is in DebugInfo.h
unsigned Line = Loc.getLineNumber();
StringRef File = Loc.getFilename();
StringRef Dir = Loc.getDirectory();
if (DILocation *Loc = I->getDebugLoc()) { // Here I is an LLVM instruction
unsigned Line = Loc->getLine();
StringRef File = Loc->getFilename();
StringRef Dir = Loc->getDirectory();
}
C/C++ global variable information