diff options
Diffstat (limited to 'emcc')
| -rwxr-xr-x | emcc | 40 |
1 files changed, 36 insertions, 4 deletions
@@ -128,8 +128,12 @@ Most normal gcc/g++ options will work, for example: --version Display compiler version information Options that are modified or new in %s include: - -O0 [..] default - -OX TODO + -O0 No optimizations (default) + -O1 Simple optimizations and no runtime assertions + -O2 As -O1, plus code flow optimization (relooper) + Warning: Compiling with this takes a long time! + -O3 As -O2, plus dangerous optimizations that may + break things -s OPTION=VALUE JavaScript code generation option passed into the emscripten compiler --typed-arrays <mode> 0: no typed arrays @@ -253,10 +257,20 @@ if use_linker: elif use_compiler: call = CXX if use_cxx else CC + + ## Parse args + newargs = sys.argv[1:] + + opt_level = 0 + for i in range(len(newargs)): if newargs[i].startswith('-O'): - if DEBUG: print >> sys.stderr, 'emcc: WARNING: Optimization flags (-Ox) are ignored in emcc. Tell emscripten.py to do that, or run LLVM opt.' + try: + opt_level = int(newargs[i][2]) + assert 0 <= opt_level <= 3 + except: + raise Exception('Invalid optimization level: ' + newargs[i]) newargs[i] = '' newargs = [ arg for arg in newargs if arg is not '' ] + CC_ADDITIONAL_ARGS @@ -271,6 +285,8 @@ elif use_compiler: final_suffix = target.split('.')[-1] + ## Compile + # First, generate LLVM bitcode TODO: handle |emcc a.cpp b.cpp -c| which generate *two* bitcode files newargs = newargs + ['-emit-llvm', '-c', '-o', target_basename + '.bc'] @@ -283,7 +299,23 @@ elif use_compiler: shutil.move(target_basename + '.bc', target_basename + '.o') exit(0) - # Continue on to create JavaScript + ## Continue on to create JavaScript + + # Apply optimization level settings + if opt_level >= 1: + shared.Settings.ASSERTIONS = 0 + if opt_level >= 2: + shared.Settings.RELOOP = 1 + if opt_level >= 3: + shared.Settings.CORRECT_SIGNS = 0 + shared.Settings.CORRECT_OVERFLOWS = 0 + shared.Settings.CORRECT_ROUNDINGS = 0 + shared.Settings.I64_MODE = 0 + shared.Settings.DOUBLE_MODE = 0 + shared.Settings.DISABLE_EXCEPTION_CATCHING = 1 + + # TODO: apply -s settings in newargs here (after -Ox, so they can override it) + temp_files = shared.TempFiles() temp_files.note(target_basename + '.bc') try: |