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48 Commits

Author SHA1 Message Date
Rafael Espindola
90896edc6c This commit introduces two fake instructions MORESTACK_RET and 
MORESTACK_RET_RESTORE_R10; which are lowered to a RET and a RET
followed by a MOV respectively.  Having a fake instruction prevents
the verifier from seeing a MachineBasicBlock end with a
non-terminator (MOV).  It also prevents the rather eccentric case of a
MachineBasicBlock ending with RET but having successors nevertheless.

Patch by Sanjoy Das.

llvm-svn: 143062
 2011-10-26 21:12:27 +00:00
Duncan Sands
2faab7dd2a Fix a bunch of unused variable warnings when doing a release 
build with gcc-4.6.

llvm-svn: 142350
 2011-10-18 12:44:00 +00:00
Bill Wendling
dcd9c25744 More closely follow libgcc, which has code after the `ret' instruction to 
release the stack segment and reset the stack pointer. Place the code in its own
MBB to make the verifier happy.

llvm-svn: 141859
 2011-10-13 08:24:19 +00:00
Bill Wendling
a6bf25f30a Should not add instructions to a BB after a return instruction. The machine instruction verifier doesn't like this, nor do I. 
llvm-svn: 141856
 2011-10-13 07:42:32 +00:00
Jakob Stoklund Olesen
59b2982dcf Only run MF.verify() with EXPENSIVE_CHECKS=1. 
llvm-svn: 140441
 2011-09-24 01:11:19 +00:00
Bill Wendling
763ed58408 Reenable compact unwind by default. However, also emit the old version of unwind 
information for older linkers.

llvm-svn: 139206
 2011-09-06 23:47:14 +00:00
Bill Wendling
991a1dab16 Revert r138826 until PR10834 can be fixed. 
llvm-svn: 139018
 2011-09-02 18:15:04 +00:00
Rafael Espindola
295e404961 Spelling and grammar fixes to problems found by Duncan. 
llvm-svn: 138858
 2011-08-31 16:43:33 +00:00
Eli Friedman
4fefb0a561 Make sure we don't crash when -miphoneos-version-min is specified on x86. Hopefully this will fix gcc testsuite failures. 
llvm-svn: 138856
 2011-08-31 16:19:51 +00:00
Bill Wendling
1e8c335302 Fix off-by-one error Benjamin noticed. 
llvm-svn: 138832
 2011-08-30 21:23:24 +00:00
Bill Wendling
569b9fee87 Enable compact unwind info by default. This only applies to Darwin when CFI is 
disabled.

llvm-svn: 138826
 2011-08-30 20:54:11 +00:00
Rafael Espindola
321e47cd0b Emit segmented-stack specific code into function prologues for 
X86. Modify the pass added in the previous patch to call this new
code.

This new prologues generated will call a libgcc routine (__morestack)
to allocate more stack space from the heap when required

Patch by Sanjoy Das.

llvm-svn: 138812
 2011-08-30 19:39:58 +00:00
Andrew Trick
68f830e252 findDeadCallerSavedReg fix: Missing NULL terminator in register arrays. 
Fix by Ivan Baev. Sorry I don't have a unit test, but the fix is obvious so I don't want to delay it.

llvm-svn: 137404
 2011-08-12 00:49:19 +00:00
Bill Wendling
7f89bce2be The compact unwinding offsets are divided by 8 on 64-bit machines. 
llvm-svn: 136065
 2011-07-26 08:03:49 +00:00
Bill Wendling
9a3aca1f35 Update the comment. This feature is available only on Darwin at the moment. Though it's not Darwin-specific. 
llvm-svn: 135951
 2011-07-25 20:15:15 +00:00
Bill Wendling
713310d300 Changed disabled code into a flag. 
llvm-svn: 135924
 2011-07-25 18:04:49 +00:00
Bill Wendling
b910d857ef Remove dead variable. 
llvm-svn: 135923
 2011-07-25 18:01:27 +00:00
Bill Wendling
3817554121 After we've modified the prolog to save volatile registers, generate the compact 
unwind encoding for that function. This simply crawls through the prolog looking
for machine instrs marked as "frame setup". It can calculate from these what the
compact unwind should look like.

This is currently disabled because of needed linker support. But initial tests
look good.

llvm-svn: 135922
 2011-07-25 18:00:28 +00:00
Bill Wendling
1f46862df8 Mark instructions which are part of the frame setup with the MachineInstr::FrameSetup flag. 
llvm-svn: 135645
 2011-07-21 00:44:56 +00:00
Bill Wendling
4958d250c9 Remove unused function. 
llvm-svn: 135635
 2011-07-20 23:07:42 +00:00
Bill Wendling
55eb4a26d9 Remove the now defunct getCompactUnwindEncoding method from the frame lowering code. 
llvm-svn: 135634
 2011-07-20 23:04:09 +00:00
Evan Cheng
10c6820ff4 Move getInitialFrameState from TargetFrameInfo to MCAsmInfo (suggestions for 
better location welcome).

llvm-svn: 135438
 2011-07-18 22:29:13 +00:00
Bill Wendling
ed868b039b * Redo the permutation encoding for frameless stacks to be more like what the 
unwind library expects.
* Comment the permutation encoding for frameless stacks.

llvm-svn: 135202
 2011-07-14 22:01:34 +00:00
Bill Wendling
e896e46a8c Add code to handle a "frameless" unwind stack. 
The frameless unwind stack has a special encoding, the algorithm for which is in
"permuteEncode".

llvm-svn: 135103
 2011-07-13 23:03:31 +00:00
Bill Wendling
e6de1eeb86 Don't emit the FDE end label if the last thing emitted was a compact unwind and 
not the FDE

llvm-svn: 135020
 2011-07-13 00:49:09 +00:00
Bill Wendling
78fce7597f Assign variable before we test it. 
llvm-svn: 135015
 2011-07-13 00:23:39 +00:00
Bill Wendling
d61dd044e1 Fix obvious think-o. 
llvm-svn: 135014
 2011-07-13 00:20:09 +00:00
Bill Wendling
9e1528dea4 Clean up the handling of an EBP/RBP unwind frame pointer. In particular, don't 
assert when the frame pointer is -1 (i.e., the function is "frameless").

Still to do: "frameless" unwind information.

llvm-svn: 135013
 2011-07-13 00:16:14 +00:00
Bill Wendling
2b47bfeaa9 Use ArrayRef instead of a std::vector&. 
llvm-svn: 134595
 2011-07-07 04:42:01 +00:00
Bill Wendling
ba39846c2b Add a target hook to encode the compact unwind information. 
llvm-svn: 134577
 2011-07-07 00:54:13 +00:00
Nick Lewycky
6a95970b19 Fit banner in 80-col and adjust whitespace. No functionality changes. 
llvm-svn: 132964
 2011-06-14 03:23:52 +00:00
Charles Davis
27dba856ab Put FrameSetup flag on x86 instructions that set up the call frame. No 
functionality change.

Later on, we'll use the flag to emit SEH pseudo-ops that describe how the
call frame was built.

llvm-svn: 132880
 2011-06-12 01:45:54 +00:00
Rafael Espindola
70213c7c5f Replace the -unwind-tables option with a per function flag. This is more 
LTO friendly as we can now correctly merge files compiled with or without
-fasynchronous-unwind-tables.

llvm-svn: 132033
 2011-05-25 03:44:17 +00:00
Rafael Espindola
59c3a084c6 Print all the moves at a given label instead of just the first one. 
Remove previous DwarfCFI hack.

llvm-svn: 130187
 2011-04-26 03:58:56 +00:00
Rafael Espindola
99831068c8 Add 129518 back with a fix for when we are producing eh just because of debug info. 
Change ELF systems to use CFI for producing the EH tables. This reduces the
size of the clang binary in Debug builds from 690MB to 679MB.

llvm-svn: 129571
 2011-04-15 15:11:06 +00:00
Chris Lattner
0304b82f80 Fix a ton of comment typos found by codespell. Patch by 
Luis Felipe Strano Moraes!

llvm-svn: 129558
 2011-04-15 05:18:47 +00:00
NAKAMURA Takumi
7aed456653 Revert r129518, "Change ELF systems to use CFI for producing the EH tables. This reduces the" 
It broke several builds.

llvm-svn: 129557
 2011-04-15 03:35:57 +00:00
Rafael Espindola
d5eed657e2 Change ELF systems to use CFI for producing the EH tables. This reduces the 
size of the clang binary in Debug builds from 690MB to 679MB.

llvm-svn: 129518
 2011-04-14 15:18:53 +00:00
NAKAMURA Takumi
cabdaca3c7 Target/X86: [PR8777][PR8778] Tweak alloca/chkstk for Windows targets. 
FIXME: Some cleanups would be needed.
llvm-svn: 128206
 2011-03-24 07:07:00 +00:00
NAKAMURA Takumi
b35d45a714 Target/X86: Always emit "push/pop GPRs" in prologue/epilogue and emit "spill/reload frames" for XMMs. 
It improves Win64's prologue/epilogue but it would not affect ia32 and amd64 (lack of nonvolatile XMMs).

llvm-svn: 126568
 2011-02-27 08:47:19 +00:00
NAKAMURA Takumi
07a84f5950 Target/X86: Tweak allocating shadow area (aka home) on Win64. It must be enough for caller to allocate one. 
llvm-svn: 124949
 2011-02-05 15:11:32 +00:00
NAKAMURA Takumi
c4522ab931 Target/X86: Fix whitespace. 
llvm-svn: 124946
 2011-02-05 15:10:54 +00:00
Carl Norum
667d5dbdcb Test commit - fix a double 'should' in a comment. 
llvm-svn: 124652
 2011-02-01 07:38:42 +00:00
Evan Cheng
0e8c521bbd Patches to build EFI with Clang/LLVM. By Carl Norum. 
llvm-svn: 124639
 2011-02-01 01:14:13 +00:00
Anton Korobeynikov
6b2f110a3d Cleanup 
llvm-svn: 123475
 2011-01-14 21:57:58 +00:00
Jakob Stoklund Olesen
918de3a3b8 Fix a few more places that should use MBB::getLastNonDebugInstr(). 
llvm-svn: 123408
 2011-01-13 22:47:43 +00:00
Jakob Stoklund Olesen
0f2b9d9dc4 Teach frame lowering to ignore debug values after the terminators. 
llvm-svn: 123399
 2011-01-13 21:28:52 +00:00
Anton Korobeynikov
cf5967630b Rename TargetFrameInfo into TargetFrameLowering. Also, put couple of FIXMEs and fixes here and there. 
llvm-svn: 123170
 2011-01-10 12:39:04 +00:00