[MBP] Fix a really misleading typo in a comment.

[oota-llvm.git] / docs / ProgrammersManual.rst

diff --git a/docs/ProgrammersManual.rst b/docs/ProgrammersManual.rst
index f140cf509d2520289077b9569444dfe456129e96..1e7e3ac1aea473cfc7449eee1c049637d027dbdf 100644 (file)
--- a/docs/ProgrammersManual.rst
+++ b/docs/ProgrammersManual.rst
@@ -488,6 +488,9 @@ gathered, use the '``-stats``' option:
   $ opt -stats -mypassname < program.bc > /dev/null
   ... statistics output ...
 
+Note that in order to use the '``-stats``' option, LLVM must be
+compiled with assertions enabled.
+
 When running ``opt`` on a C file from the SPEC benchmark suite, it gives a
 report that looks like this:
 
@@ -937,7 +940,7 @@ There are a variety of ways to pass around and use strings in C and C++, and
 LLVM adds a few new options to choose from.  Pick the first option on this list
 that will do what you need, they are ordered according to their relative cost.
 
-Note that is is generally preferred to *not* pass strings around as ``const
+Note that it is generally preferred to *not* pass strings around as ``const
 char*``'s.  These have a number of problems, including the fact that they
 cannot represent embedded nul ("\0") characters, and do not have a length
 available efficiently.  The general replacement for '``const char*``' is
@@ -1813,7 +1816,7 @@ chain of ``F``:
 
   Function *F = ...;
 
-  for (User *U : GV->users()) {    
+  for (User *U : F->users()) {
     if (Instruction *Inst = dyn_cast<Instruction>(U)) {
       errs() << "F is used in instruction:\n";
       errs() << *Inst << "\n";
@@ -2550,6 +2553,22 @@ section on :ref:`isa and dyn_cast <isa>` and our :doc:`detailed document
 <HowToSetUpLLVMStyleRTTI>` which describes how you can implement this
 pattern for use with the LLVM helpers.
 
+.. _abi_breaking_checks:
+
+ABI Breaking Checks
+-------------------
+
+Checks and asserts that alter the LLVM C++ ABI are predicated on the
+preprocessor symbol `LLVM_ENABLE_ABI_BREAKING_CHECKS` -- LLVM
+libraries built with `LLVM_ENABLE_ABI_BREAKING_CHECKS` are not ABI
+compatible LLVM libraries built without it defined.  By default,
+turning on assertions also turns on `LLVM_ENABLE_ABI_BREAKING_CHECKS`
+so a default +Asserts build is not ABI compatible with a
+default -Asserts build.  Clients that want ABI compatibility
+between +Asserts and -Asserts builds should use the CMake or autoconf
+build systems to set `LLVM_ENABLE_ABI_BREAKING_CHECKS` independently
+of `LLVM_ENABLE_ASSERTIONS`.
+
 .. _coreclasses:
 
 The Core LLVM Class Hierarchy Reference
@@ -2632,7 +2651,7 @@ Important Derived Types
   Subclass of SequentialType for vector types.  A vector type is similar to an
   ArrayType but is distinguished because it is a first class type whereas
   ArrayType is not.  Vector types are used for vector operations and are usually
-  small vectors of of an integer or floating point type.
+  small vectors of an integer or floating point type.
 
 ``StructType``
   Subclass of DerivedTypes for struct types.