Dean Michael Berris b3cb9bd89d XRay: Add entry and exit sleds ... Summary: In this patch we implement the following parts of XRay: - Supporting a function attribute named 'function-instrument' which currently only supports 'xray-always'. We should be able to use this attribute for other instrumentation approaches. - Supporting a function attribute named 'xray-instruction-threshold' used to determine whether a function is instrumented with a minimum number of instructions (IR instruction counts). - X86-specific nop sleds as described in the white paper. - A machine function pass that adds the different instrumentation marker instructions at a very late stage. - A way of identifying which return opcode is considered "normal" for each architecture. There are some caveats here: 1) We don't handle PATCHABLE_RET in platforms other than x86_64 yet -- this means if IR used PATCHABLE_RET directly instead of a normal ret, instruction lowering for that platform might do the wrong thing. We think this should be handled at instruction selection time to by default be unpacked for platforms where XRay is not availble yet. 2) The generated section for X86 is different from what is described from the white paper for the sole reason that LLVM allows us to do this neatly. We're taking the opportunity to deviate from the white paper from this perspective to allow us to get richer information from the runtime library. Reviewers: sanjoy, eugenis, kcc, pcc, echristo, rnk Subscribers: niravd, majnemer, atrick, rnk, emaste, bmakam, mcrosier, mehdi_amini, llvm-commits Differential Revision: http://reviews.llvm.org/D19904 llvm-svn: 275367		2016-07-14 04:06:33 +00:00
..
Analysis	[BFI] Add new LazyBFI analysis pass	2016-07-13 05:01:48 +00:00
Assembler	[ConstantFold] Don't incorrectly infer inbounds on array GEP	2016-07-13 03:24:41 +00:00
Bindings	Add writeonly IR attribute	2016-07-04 08:01:29 +00:00
Bitcode	Add writeonly IR attribute	2016-07-04 08:01:29 +00:00
BugPoint
CodeGen	XRay: Add entry and exit sleds	2016-07-14 04:06:33 +00:00
DebugInfo	Synchronize LLVM and clang's ObjCDeclSpec::ObjCPropertyAttributeKind.	2016-07-14 00:41:18 +00:00
Examples
ExecutionEngine	ExecutionEngine: add preliminary support for COFF ARM	2016-06-24 14:11:44 +00:00
Feature	Temporarily remove a test case to unblock PPC bots.	2016-07-08 00:35:39 +00:00
FileCheck
Instrumentation	[tsan] Try harder to not instrument gcov counters	2016-07-07 22:45:28 +00:00
Integer
JitListener
LibDriver
Linker	Don't verify inputs to the Linker if ODR merging.	2016-06-29 18:31:48 +00:00
LTO	Add a libLTO API to query a memory buffer and check if it contains ObjC categories	2016-07-11 23:10:18 +00:00
MC	[MC] Fix lexing ordering in assembly label parsing to preserve same line	2016-07-13 14:03:12 +00:00
Object	Add checks to the MachOObjectFile() constructor to make sure load commands sizes	2016-07-07 22:11:42 +00:00
ObjectYAML	[YAML] Fix YAML tags appearing before the start of sequence elements	2016-06-28 21:10:26 +00:00
Other	Temporarily remove one test run line to unblock PPC bots.	2016-07-08 00:32:58 +00:00
SymbolRewriter
TableGen	tests: accept different TargetOpcode values.	2016-07-07 17:51:42 +00:00
ThinLTO/X86	ThinLTO: Do not take into account whether a definition has multiple copies when promoting.	2016-07-07 18:31:51 +00:00
tools	[ThinLTO/gold] Enable symbol resolution in distributed backend case	2016-07-13 16:35:56 +00:00
Transforms	[IPSCCP] Constant fold struct argument/instructions when all the lattice values are constant.	2016-07-14 02:51:41 +00:00
Unit
Verifier	Add writeonly IR attribute	2016-07-04 08:01:29 +00:00
YAMLParser
.clang-format
CMakeLists.txt
lit.cfg	Review fixes to lit documentation	2016-07-12 20:59:17 +00:00
lit.site.cfg.in
TestRunner.sh