The main observation is that we never need both the filesize and the map size.
When mapping a slice of a file, it doesn't make sense to request a null
terminator and that would be the only case where the filesize would be used.

There are other cleanups that should be done in this area:

* A client should not have to pass the size (even an explicit -1) to say if
  it wants a null terminator or not, so we should probably swap the argument
  order.
* The default should be to not require a null terminator. Very few clients
  require this, but many end up asking for it just because it is the default.

llvm-svn: 186984

llvm-svn: 186887

llvm-svn: 186676

The plan is to use it for clang and lld.

Major behavior changes:
- We can now parse UTF-16 files that have a byte order mark.
- PR16209: Don't drop backslashes on the floor if they don't escape
  anything.

The actual parsing loop was based on code from Clang's driver.cpp,
although it's been rewritten to track its state with control flow rather
than state variables.

Reviewers: hans

Differential Revision: http://llvm-reviews.chandlerc.com/D1170

llvm-svn: 186587

llvm-svn: 186561

We don't want cast and dyn_cast to work on temporaries. They don't extend
lifetime like a direct bind to a reference would, so they can introduce
hard to find bugs.

I added tests to make sure we don't regress this. Thanks to Eli Friedman for
noticing this and for his suggestions on how to test it.

llvm-svn: 186559

This centralizes the handling of O_BINARY and opens the way for hiding more
differences (like how open behaves with directories).

llvm-svn: 186447

This is to support parsing UTF16 response files in LLVM/lib/Option for
lld and clang.

Reviewers: hans

Differential Revision: http://llvm-reviews.chandlerc.com/D1138

llvm-svn: 186426

llvm-svn: 186375

llvm-svn: 186372

llvm-svn: 185834

llvm-svn: 185730

llvm-svn: 185719

llvm-svn: 185226

Allow a BlockFrequency to be divided by a non-zero BranchProbability
with saturating arithmetic. This will be used to compute the frequency
of a loop header given the probability of leaving the loop.

Our long division algorithm already saturates on overflow, so that was a
freebie.

llvm-svn: 185184

There are a few valid situation where we care about the structure inside a
directory, but not about the directory itself. A simple example is for unit
testing directory traversal.

PathV1 had a function like this, add one to V2 and port existing users of the
created temp file and delete it hack to using it.

llvm-svn: 185059

llvm itself is now PathV1 clean.

llvm-svn: 184947

I will remove the V1 version as soon as I change clang in the next commit.

llvm-svn: 184914

Revert "BlockFrequency: Saturate at 1 instead of 0 when multiplying a frequency with a branch probability."

This reverts commit r184584. Breaks PPC selfhost.

llvm-svn: 184590

Zero is used by BlockFrequencyInfo as a special "don't know" value. It also
causes a sink for frequencies as you can't ever get off a zero frequency with
more multiplies.

This recovers a 10% regression on MultiSource/Benchmarks/7zip. A zero frequency
was propagated into an inner loop causing excessive spilling.

PR16402.

llvm-svn: 184584

llvm-svn: 184431

Modified the implementation of fs::GetUniqueID on Windows such that it actually finds a unique identifier for a file.  Also adds unit tests for GetUniqueID.

llvm-svn: 184351

llvm-svn: 183940

It was only used to implement ExecuteAndWait and ExecuteNoWait. Expose just
those two functions and make Execute and Wait implementations details.

llvm-svn: 183864

Most clients have already been moved from Path V1 to V2. The ones using V1
now include PathV1.h explicitly.

llvm-svn: 183801

sys::process::get_id() now returns the process ID instead of a process handle on Windows.  Patch thanks to Kim Gräsman!

llvm-svn: 183621

llvm-svn: 183054

llvm-svn: 183053

llvm-svn: 182900

llvm-svn: 182693

Add a stringize method to make dumping a bit easier, and add a testcase
exercising a few different paths.

llvm-svn: 182692

llvm-svn: 182690

llvm-svn: 182679

llvm-svn: 182667

-DLLVM_ENABLE_THREADS=false.

llvm-svn: 181788

Implemented public interface for modifying registered (not positional or sink options) command line options at runtime.

Patch by Dan Liew!

llvm-svn: 181254

Patch by Dan Liew!

llvm-svn: 181253

This seemed like the cleanest way to find the test executable.  Also fix
the file mode.

llvm-svn: 180770

That seems to interact poorly with the environ and _environ macros
defined in MSVC's <stdlib.h>.

Also remove the incorrect comment about _NSGetEnviron().

llvm-svn: 180200

This was r180041 and r180046, which was reverted in r180066.
Re-committing this should fix the dragonegg bootstrap, which I presume
needs LD_LIBRARY_PATH to be propagated to the child.

Tested on Linux, Windows, and Mac OS 10.6.

llvm-svn: 180099