Add malloc/new profiling on linux

Makefile.standalone

 # The following variables will likely need to be modified, depending on where
 # and how you built LLVM & Clang. They can be overridden in a command-line
 # invocation of make, like:
 #
 #   make LLVM_SRC_PATH=<path> LIBCXX_INSTALL_PATH=<path> CLANG_PATH=<path> \
 #        PNACL_BIN_PATH=<path> ...
 #
 
 # LLVM_SRC_PATH is the path to the root of the checked out source code. This
 # directory should contain the configure script, the include/ and lib/
@@ skipping 134 matching lines @@
   # handle bundle_lock pad-to-end correctly.
   # TODO(jpp): fix this.
   FORCEASM_LIT_TEST_EXCLUDES = --filter='^(?!.*/x86/sandboxing.ll).*'
 else
   FORCEASM_FLAG =
   FORCEASM_XTEST_EXCLUDES =
   FORCEASM_LIT_PARAM =
   FORCEASM_LIT_TEST_EXCLUDES =
 endif
 
+ifdef LINUX_MALLOC_PROFILE

[Jim Stichnoth, 2016/03/12 00:12:57]

Update OBJDIR, something like:

  OBJDIR := $(OBJDIR)+MalProf

Otherwise "make" won't necessarily rebuild source files when you add
LINUX_MALLOC_PROFILE to the command line.

[sehr, 2016/03/15 00:36:45]

Done.

+  CXX_DEFINES += -DALLOW_LINUX_MALLOC_PROFILE=1

[Jim Stichnoth, 2016/03/12 00:12:58]

Can you update BASE_CXX_DEFINES instead of CXX_DEFINES?

[sehr, 2016/03/15 00:36:45]

Done.

+  LD_EXTRA += -Wl,--export-dynamic
+endif
+
 SB_OBJDIR := $(OBJDIR)+Sandboxed
 SBB_OBJDIR := $(OBJDIR)+SandboxedBrowser
 
 $(info -----------------------------------------------)
 $(info Using LLVM_SRC_PATH = $(LLVM_SRC_PATH))
 $(info Using SB_LLVM_PATH = $(SB_LLVM_PATH))
 $(info Using NACL_ROOT = $(NACL_ROOT))
 $(info Using TOOLCHAIN_ROOT = $(TOOLCHAIN_ROOT))
 $(info Using PNACL_TOOLCHAIN_ROOT = $(PNACL_TOOLCHAIN_ROOT))
 $(info Using PNACL_BIN_PATH = $(PNACL_BIN_PATH))
@@ skipping 118 matching lines @@
   IceTypes.cpp \
   main.cpp \
   PNaClTranslator.cpp
 
 ifndef MINIMAL
   SRCS += \
     IceConverter.cpp \
     IceTypeConverter.cpp
 endif
 
+ifdef LINUX_MALLOC_PROFILE
+  SRCS += LinuxMallocProfiling.cpp

[Jim Stichnoth, 2016/03/12 00:12:57]

I actually think this source file should be added to SRCS unconditionally, and
its entire contents should be wrapped in an #ifdef.  This is because the LLVM
build system does not use Makefile.standalone, instead it uses Makefile and
CMakeLists.txt.

Better yet, if it at least compiles on all platforms, use BuildDefs so the
compiler normally compiles it but optimizes it away.

[sehr, 2016/03/15 00:36:45]

I added the source unconditionally, and the bodies of the functions are empty
unless the flag is defined.

+endif
+
 OBJS=$(patsubst %.cpp, $(OBJDIR)/%.o, $(SRCS))
 SB_OBJS=$(patsubst %.cpp, $(SB_OBJDIR)/%.o, $(SRCS))
 SBB_OBJS=$(patsubst %.cpp, $(SBB_OBJDIR)/%.o, $(SRCS))
 
 UNITTEST_SRCS = \
   BitcodeMunge.cpp \
   IceELFSectionTest.cpp \
   IceParseInstsTest.cpp
 
 # The X86 assembler tests take too long to compile. Given how infrequently the
@@ skipping 309 matching lines @@
 
 help-check-xtest:
         @cat Makefile.standalone-help/check-xtest.txt
 
 clean:
         rm -rf pnacl-sz *.o $(foreach nexe,$(NEXES),$(notdir $(nexe))) \
           $(OBJDIR) $(SB_OBJDIR) $(SBB_OBJDIR) build/*.bloat.json
 
 clean-all: clean
         rm -rf build/  crosstest/Output/