how the CodeGen machinery works.

llvm-svn: 44786

Improve branch folding by recgonizing that explict successor relationships impact the value of fall-through choices.

llvm-svn: 44785

llvm-svn: 44784

llvm-svn: 44783

llvm-svn: 44782

start making features be a more detailed description of the features/goals section on the main page.

llvm-svn: 44781

llvm-svn: 44780

llvm-svn: 44779

llvm-svn: 44778

llvm-svn: 44777

llvm-svn: 44776

llvm-svn: 44775

llvm-svn: 44774

methods are new to Function:

  bool hasCollector() const;
  const std::string &getCollector() const;
  void setCollector(const std::string &);
  void clearCollector();

The assembly representation is as such:

  define void @f() gc "shadow-stack" { ...

The implementation uses an on-the-side table to map Functions to 
collector names, such that there is no overhead. A StringPool is 
further used to unique collector names, which are extremely
likely to be unique per process.

llvm-svn: 44769

llvm-svn: 44763

llvm-svn: 44762

llvm-svn: 44761

_sabre_: it has a major problem: by the time ~Value is run, all of the "parts" of the derived classes have been destroyed
_sabre_: the vtable lives to fight another day

llvm-svn: 44760

llvm-svn: 44759

llvm-svn: 44758

llvm-svn: 44757

llvm-svn: 44756

llvm-svn: 44755

llvm-svn: 44754

llvm-svn: 44753

char text[] = "string";

llvm-svn: 44752

llvm-svn: 44751

char text[8] = "string";

Big fixme remains.

llvm-svn: 44750

llvm-svn: 44749

llvm-svn: 44748

llvm-svn: 44747

C99 6.5.6.

llvm-svn: 44746

llvm-svn: 44745

llvm-svn: 44744

not the start of a logical line.  Be careful about this distinction, which 
affects when newlines are printed and when paste-avoidance happens, etc.  
This fixes PR1848, thanks to Neil for noticing this!

llvm-svn: 44743

This would cause us to emit different code (in -E mode) for these two files:

---
#define t(x) x

t(a
3)
---
#define t(x) x
t(a
3)
---

In one case, -E would print "a\n3", in the other it printed "a3".  Now
it prints "a3" for both.

This is part of PR1848.

llvm-svn: 44742

info of each token.

llvm-svn: 44741

knows the vector is not pow2

llvm-svn: 44740

llvm-svn: 44739

llvm-svn: 44738