Commit Graph

20 Commits

Author SHA1 Message Date
Craig Topper 3c76c523e1 Cleanup places that passed SMLoc by const reference to pass it by value instead. NFC
llvm-svn: 248135
2015-09-20 23:35:59 +00:00
Rafael Espindola 0709a7bd1a Move alignment from MCSectionData to MCSection.
This starts merging MCSection and MCSectionData.

There are a few issues with the current split between MCSection and
MCSectionData.

* It optimizes the the not as important case. We want the production
of .o files to be really fast, but the split puts the information used
for .o emission in a separate data structure.

* The ELF/COFF/MachO hierarchy is not represented in MCSectionData,
leading to some ad-hoc ways to represent the various flags.

* It makes it harder to remember where each item is.

The attached patch starts merging the two by moving the alignment from
MCSectionData to MCSection.

Most of the patch is actually just dropping 'const', since
MCSectionData is mutable, but MCSection was not.

llvm-svn: 237936
2015-05-21 19:20:38 +00:00
Toma Tabacu 9ca5096f59 [mips] [IAS] Add support for the .insn directive.
Summary:
This assembler directive marks the current label as an instruction label in microMIPS and MIPS16.

This initial implementation works only for microMIPS.

Reviewers: dsanders

Reviewed By: dsanders

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8006

llvm-svn: 235084
2015-04-16 09:53:47 +00:00
Rafael Espindola 5560a4cfbd Use raw_pwrite_stream in the object writer/streamer.
The ELF object writer will take advantage of that in the next commit.

llvm-svn: 234950
2015-04-14 22:14:34 +00:00
Rafael Espindola cd584a809d Split the object streamer callback in one per file format.
There are two main advantages to doing this

* Targets that only need to handle one of the formats specially don't have
  to worry about the others. For example, x86 now only registers a
  constructor for the COFF streamer.

* Changes to the arguments passed to one format constructor will not impact
  the other formats.

llvm-svn: 232699
2015-03-19 01:50:16 +00:00
Eric Christopher a576281694 Move the Mips target to storing the ABI in the TargetMachine rather
than on MipsSubtargetInfo.

This required a bit of massaging in the MC level to handle this since
MC is a) largely a collection of disparate classes with no hierarchy,
and b) there's no overarching equivalent to the TargetMachine, instead
only the subtarget via MCSubtargetInfo (which is the base class of
TargetSubtargetInfo).

We're now storing the ABI in both the TargetMachine level and in the
MC level because the AsmParser and the TargetStreamer both need to
know what ABI we have to parse assembly and emit objects. The target
streamer has a pointer to the one in the asm parser and is updated
when the asm parser is created. This is fragile as the FIXME comment
notes, but shouldn't be a problem in practice since we always
create an asm parser before attempting to emit object code via the
assembler. The TargetMachine now contains the ABI so that the DataLayout
can be constructed dependent upon ABI.

All testcases have been updated to use the -target-abi command line
flag so that we can set the ABI without using a subtarget feature.

Should be no change visible externally here.

llvm-svn: 227102
2015-01-26 17:33:46 +00:00
Zoran Jovanovic 9c654830f7 [mips][microMIPS] Mark symbols as microMIPS if necessary
Differential Revision: http://reviews.llvm.org/D6039

llvm-svn: 221355
2014-11-05 16:35:20 +00:00
Rafael Espindola 7b61ddfa6e Simplify handling of --noexecstack by using getNonexecutableStackSection.
llvm-svn: 219799
2014-10-15 16:12:52 +00:00
Benjamin Kramer a7c40ef022 Canonicalize header guards into a common format.
Add header guards to files that were missing guards. Remove #endif comments
as they don't seem common in LLVM (we can easily add them back if we decide
they're useful)

Changes made by clang-tidy with minor tweaks.

llvm-svn: 215558
2014-08-13 16:26:38 +00:00
Daniel Sanders 68c3747efb [mips] Add MipsOptionRecord abstraction and use it to implement .reginfo/.MIPS.options
This abstraction allows us to support the various records that can be placed in
the .MIPS.options section in the future. We currently use it to record register
usage information (the ODK_REGINFO record in our ELF64 spec).

Each .MIPS.options record should subclass MipsOptionRecord and provide an
implementation of EmitMipsOptionRecord.

Patch by Matheus Almeida and Toma Tabacu

llvm-svn: 213522
2014-07-21 13:30:55 +00:00
Matheus Almeida a805e85cb2 [mips] Remove unused private field.
llvm-svn: 204919
2014-03-27 12:02:48 +00:00
Matheus Almeida dac77fb389 [mips] Implement custom MCELFStreamer.
This allows us to insert some hooks before emitting data into an actual object file.
For example, we can capture the register usage for a translation unit by overriding
the EmitInstruction method. The register usage information is needed to generate
.reginfo and .Mips.options ELF sections.
    
No functional changes.
    
Differential Revision: http://llvm-reviews.chandlerc.com/D3129

llvm-svn: 204917
2014-03-27 11:39:03 +00:00
Rafael Espindola ac4ad25a00 Remove some really nasty uses of hasRawTextSupport.
When MC was first added, targets could use hasRawTextSupport to keep features
working before they were added to the MC interface.

The design goal of MC is to provide an uniform api for printing assembly and
object files. Short of relaxations and other corner cases, a object file is
just another representation of the assembly.

It was never the intention that targets would keep doing things like

if (hasRawTextSupport())
  Set flags in one way.
else
  Set flags in another way.

When they do that they create two code paths and the object file is no longer
just another representation of the assembly. This also then requires testing
with llc -filetype=obj, which is extremelly brittle.

This patch removes some of these hacks by replacing them with smaller ones.
The ARM flag setting is trivial, so I just moved it to the constructor. For
Mips, the patch adds two temporary hack directives that allow the assembly
to represent the same things as the object file was already able to.

The hope is that the mips developers will replace the hack directives with
the same ones that gas uses and drop the -print-hack-directives flag.

I will also try to implement a target streamer interface, so that we can
move this out of the common code.

In summary, for any new work, two rules of the thumb are
  * Don't use "llc -filetype=obj" in tests.
  * Don't add calls to hasRawTextSupport.

llvm-svn: 192035
2013-10-05 16:42:21 +00:00
Jack Carter 13d5f753f8 reverting per request
llvm-svn: 191992
2013-10-04 22:52:31 +00:00
Jack Carter 721726adfc [MC][AsmParser] Hook for post assembly file processing
This patch handles LLVM standalone assembler (llvm-mc) ELF flag setting based on input file
directive processing.

Mips assembly requires processing inline directives that directly and
indirectly affect the output ELF header flags. This patch handles one
".abicalls".

To process these directives we are following the model the code generator
uses by storing state in a container as we go through processing and when
we detect the end of input file processing, AsmParser is notified and we
update the ELF header flags through a MipsELFStreamer method with a call from
MCTargetAsmParser::emitEndOfAsmFile(MCStreamer &OutStreamer).

This patch will allow other targets the same functionality.

Jack

llvm-svn: 191982
2013-10-04 21:26:15 +00:00
Jack Carter ab3cb425aa ELF symbol table field st_other support,
excluding visibility bits.

Mips (MicroMips) specific STO handling .

The st_other field settig for STO_MIPS_MICROMIPS

Contributer: Zoran Jovanovic
llvm-svn: 175564
2013-02-19 22:04:37 +00:00
Jack Carter 10be6aef15 This patch changes a static_cast to dyn_cast
for MipsELFStreamer objects.

Contributer: Jack Carter
 
llvm-svn: 174354
2013-02-05 07:47:41 +00:00
David Blaikie 24f44ac53a Removing initializer for the field removed in r173887
llvm-svn: 173888
2013-01-30 03:04:07 +00:00
David Blaikie b7fa813373 Remove unused variable (introduced in r173884) to clear clang -Werror build
llvm-svn: 173887
2013-01-30 02:56:02 +00:00
Jack Carter 7f378104b6 This patch implements runtime Mips specific
setting of ELF header e_flags.

Contributer: Jack Carter
 
llvm-svn: 173884
2013-01-30 02:16:36 +00:00