t-crest / platin

PLATIN toolset

This directory contains the PLATIN tools for manipulating, generating and transforming PML files.

Setup

Recommended

• ./setup.sh
• export PATH=<platin_dir>:$PATH

Alternative

• ./install.sh -i <build_dir>
• export PATH=<build_dir>/bin/:$PATH

Requirements

• ruby 1.9 or newer (mandatory)
  • ruby 2.6.3 known to work
• lpsolve
  • sudo aptitude install liblpsolve55-dev
• Ubuntu/Debian specific
  • point LD_LIBRARY_PATH to the lpsolve library, e.g export LD_LIBRARY_PATH=/usr/lib/lp_solve:$LD_LIBRARY_PATH

Basic Usage

• Compile test program

    echo 'volatile int out; __attribute__((noinline)) void f(int x) { int i; for(i = 0; i<1024;i++) out+=x; } ' > test.c
    echo 'int main() { f(3); f(5); return 0; }' >> test.c
    patmos-clang -Wall -mserialize=test.pml -mpreemit-bitcode=test.bc -o test test.c
  

• Analyze using aiT

    platin wcet -i test.pml -b test --report
  

• Analyze f() using platin-internal analyzer only

    platin wcet --analysis-entry f -i test.pml -b test --disable-ait --enable-wca --report
  

• Enable analysis of the (dynamic) execution trace [for comparison]

    platin wcet --enable-trace-analysis  --trace-entry main --analysis-entry f -i test.pml -b test --enable-wca --report
  

• Use flow facts from the (dynamic) execution trace [for early-stage development]

    platin wcet --use-trace-facts  --trace-entry main --analysis-entry f -i test.pml -b test --enable-wca --report
  

LLVM Options

CodeGen/Passes:

• -mserialize=FILE
• -mpreemit-bitcode=FILE
• -mserialize-roots=LIST

Known Problems

• tool chain problems
  • mrtc/whet -O0: Needs math libraries => problem with atan function

Demo of individual tools

MORE TO COME

Architectures

Notes for ARM (not up-to-date)

# Install ARM crosscompiler (Ubuntu)
#   sudo aptitude install gcc-arm-linux-gnueabi  libc6-dev-armel-cross
#
# Install ARM simulator (Ubuntu)
#   hg clone http://repo.gem5.org/gem5-stable
#   cd gem5-stable
#   emacs src/arch/arm/linux/process.cc # change linux version in line 69 to '2.6.35'
#   scons build/ARM/gem5.opt
#   GEM5_HOME=`pwd`

# Demo
# source = src/$1.c
mkdir -p bin out

# Compile using clang
patmos-clang -O1 -target arm-linux-gnueabi -marm -Xclang -backend-option -Xclang -mserialize=bin/$1.pml \
                 -c -o bin/$1.o  src/$1.c

# Link using arm-linux-gnueabi-gcc
arm-linux-gnueabi-gcc  -static bin/$1.o -o bin/$1.elf

# Simulate using GEM5
$GEM5_HOME/build/ARM/gem5.opt --debug-flags=Exec,-ExecMicro,ExecMacro --trace-file=$1.trace \
                              $GEM5_HOME/configs/example/se.py -c bin/$1.elf

# Analyze using platin (pseudo costs)
platin wcet --disable-ait --trace-file m5out/$1.trace --outdir out -b bin/$1.elf -i bin/$1.pml --report