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Author SHA1 Message Date
David Blaikie c3f30a7fc6 Reapply: DebugInfo: Assume an absence of ranges or high_pc on a CU means the CU is empty (devoid of code addresses) 
Originally committed in r349333, reverted in r349353.

GCC emitted these unconditionally on/before 4.4/March 2012
Clang emitted these unconditionally on/before 3.5/March 2014

This improves performance when parsing CUs (especially those using split
DWARF) that contain no code ranges (such as the mini CUs that may be
created by ThinLTO importing - though generally they should be/are
avoided, especially for Split DWARF because it produces a lot of very
small CUs, which don't scale well in a bunch of other ways too
(including size)).

The revert was due to a (Google internal) test that had some checked in old
object files missing DW_AT_ranges. That's since been fixed.

llvm-svn: 349968
 2018-12-21 22:25:01 +00:00
Eric Liu 6c933a2bed Revert "DebugInfo: Assume an absence of ranges or high_pc on a CU means the CU is empty (devoid of code addresses)" 
This reverts commit r349333. It caused internal test to fail. I have
sent more information to the author.

llvm-svn: 349353
 2018-12-17 14:14:40 +00:00
David Blaikie 884deed1b3 DebugInfo: Assume an absence of ranges or high_pc on a CU means the CU is empty (devoid of code addresses) 
GCC emitted these unconditionally on/before 4.4/March 2012
Clang emitted these unconditionally on/before 3.5/March 2014

This improves performance when parsing CUs (especially those using split
DWARF) that contain no code ranges (such as the mini CUs that may be
created by ThinLTO importing - though generally they should be/are
avoided, especially for Split DWARF because it produces a lot of very
small CUs, which don't scale well in a bunch of other ways too
(including size)).

llvm-svn: 349333
 2018-12-17 08:27:19 +00:00
Alexey Samsonov 897f2cf408 Update tests for DWARF parser: store sources next to pre-built object files and provide build instructions 
llvm-svn: 174711
 2013-02-08 14:34:33 +00:00
Alexey Samsonov e16e16add6 DebugInfo library: add support for fetching absolute paths to source files 
(instead of basenames) from DWARF. Use this behavior in llvm-dwarfdump tool.

Reviewed by Benjamin Kramer.

llvm-svn: 160496
 2012-07-19 07:03:58 +00:00
Alexey Samsonov f4462fa3ca This patch extends the libLLVMDebugInfo which contains a minimalistic DWARF parser: 
1) DIContext is now able to return function name for a given instruction address (besides file/line info).
2) llvm-dwarfdump accepts flag --functions that prints the function name (if address is specified by --address flag).
3) test case that checks the basic functionality of llvm-dwarfdump added

llvm-svn: 159512
 2012-07-02 05:54:45 +00:00