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Serge Pavlov 431502a675 Report fatal error in the case of out of memory 
Analysis of fails in the case of out of memory errors can be tricky on
Windows. Such error emerges at the point where memory allocation function
fails, but manifests itself when null pointer is used. These two points
may be distant from each other. Besides, next runs may not exhibit
allocation error.

Usual programming practice does not require checking result of 'operator
new' because it throws 'std::bad_alloc' in the case of allocation error.
However, LLVM is usually built with exceptions turned off, so 'new' can
return null pointer. This change installs custom new handler, which causes
fatal error in the case of out of memory. The handler is installed
automatically prior to call to 'main' during construction of a static
object defined in 'lib/Support/ErrorHandling.cpp'. If the application does
not use this file, the handler may be installed manually by a call to
'llvm::install_out_of_memory_new_handler', declared in
'include/llvm/Support/ErrorHandling.h".

There are calls to C allocation functions, malloc, calloc and realloc.
They are used for interoperability with C code, when allocated object has
variable size and when it is necessary to avoid call of constructors. In
many calls the result is not checked against null pointer. To simplify
checks, new functions are defined in the namespace 'llvm' with the
same names as these C function. These functions produce fatal error if
allocation fails. User should use 'llvm::malloc' instead of 'std::malloc'
in order to use the safe variant. This change replaces 'std::malloc'
in the cases when the result of allocation function is not checked against
null pointer.

Finally, there are plain C code, that uses malloc and similar functions. If
the result is not checked, assert statements are added.

Differential Revision: https://reviews.llvm.org/D43010

llvm-svn: 325224
 		2018-02-15 09:20:26 +00:00
clang [clang-format] Improve ObjC headers detection 2018-02-15 08:47:56 +00:00
clang-tools-extra [clang-tidy] Minor documentation fix 2018-02-15 09:19:23 +00:00
compiler-rt Teach sanitizer about NetBSD specific ioctl(2) calls 2018-02-15 03:36:16 +00:00
debuginfo-tests [debuginfo-tests] Support moving debuginfo-tests to llvm/projects 2017-12-12 16:54:20 +00:00
libclc amdgpu/half_recip: Switch implementation to native_recip 2018-02-13 22:09:46 +00:00
libcxx Fix test failure on compilers w/o deduction guides 2018-02-15 02:41:19 +00:00
libcxxabi [demangler] Support for exception specifications on function types. 2018-02-14 01:08:20 +00:00
libunwind [cmake] [libunwind] LLVM_FOUND isn't always set, so just test if 2018-01-27 19:31:44 +00:00
lld [ELF] Simplify handling of AT section attribute. 2018-02-15 06:13:52 +00:00
lldb Supply missing break in case statement. 2018-02-14 23:16:36 +00:00
llgo irgen: Create functions instead of global variables for builtin hash and equal algorithms. 2017-06-04 22:11:28 +00:00
llvm Report fatal error in the case of out of memory 2018-02-15 09:20:26 +00:00
openmp [CMake] Add -fno-experimental-isel for testing 2018-02-15 08:10:22 +00:00
parallel-libs [Axccel] Remove -Wno-missing-braces in build 2016-12-19 21:34:07 +00:00
polly [ScopBuilder] scalar-indep: Fix mutually referencing PHIs. 2018-02-12 21:09:40 +00:00
README.md Add an svn project to contain the files that appear at the root of the 2017-10-19 21:09:49 +00:00

README.md

Low Level Virtual Machine (LLVM)

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.