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/*
* Copyright 2016 WebAssembly Community Group participants
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef wasm_tools_optimization_options_h
#define wasm_tools_optimization_options_h
#include "tool-options.h"
//
// Shared optimization options for commandline tools
//
namespace wasm {
struct OptimizationOptions : public ToolOptions {
static constexpr const char* DEFAULT_OPT_PASSES = "O";
std::vector<std::string> passes;
OptimizationOptions(const std::string& command,
const std::string& description)
: ToolOptions(command, description) {
(*this)
.add("",
"-O",
"execute default optimization passes",
Options::Arguments::Zero,
[this](Options*, const std::string&) {
passOptions.setDefaultOptimizationOptions();
passes.push_back(DEFAULT_OPT_PASSES);
})
.add("",
"-O0",
"execute no optimization passes",
Options::Arguments::Zero,
[this](Options*, const std::string&) {
passOptions.optimizeLevel = 0;
passOptions.shrinkLevel = 0;
})
.add("",
"-O1",
"execute -O1 optimization passes (quick&useful opts, useful for "
"iteration builds)",
Options::Arguments::Zero,
[this](Options*, const std::string&) {
passOptions.optimizeLevel = 1;
passOptions.shrinkLevel = 0;
passes.push_back(DEFAULT_OPT_PASSES);
})
.add(
"",
"-O2",
"execute -O2 optimization passes (most opts, generally gets most perf)",
Options::Arguments::Zero,
[this](Options*, const std::string&) {
passOptions.optimizeLevel = 2;
passOptions.shrinkLevel = 0;
passes.push_back(DEFAULT_OPT_PASSES);
})
.add("",
"-O3",
"execute -O3 optimization passes (spends potentially a lot of time "
"optimizing)",
Options::Arguments::Zero,
[this](Options*, const std::string&) {
passOptions.optimizeLevel = 3;
passOptions.shrinkLevel = 0;
passes.push_back(DEFAULT_OPT_PASSES);
})
.add("",
"-O4",
"execute -O4 optimization passes (also flatten the IR, which can "
"take a lot more time and memory, but is useful on more nested / "
"complex / less-optimized input)",
Options::Arguments::Zero,
[this](Options*, const std::string&) {
passOptions.optimizeLevel = 4;
passOptions.shrinkLevel = 0;
passes.push_back(DEFAULT_OPT_PASSES);
})
.add("",
"-Os",
"execute default optimization passes, focusing on code size",
Options::Arguments::Zero,
[this](Options*, const std::string&) {
passOptions.optimizeLevel = 2;
passOptions.shrinkLevel = 1;
passes.push_back(DEFAULT_OPT_PASSES);
})
.add("",
"-Oz",
"execute default optimization passes, super-focusing on code size",
Options::Arguments::Zero,
[this](Options*, const std::string&) {
passOptions.optimizeLevel = 2;
passOptions.shrinkLevel = 2;
passes.push_back(DEFAULT_OPT_PASSES);
})
.add("--optimize-level",
"-ol",
"How much to focus on optimizing code",
Options::Arguments::One,
[this](Options* o, const std::string& argument) {
passOptions.optimizeLevel = atoi(argument.c_str());
})
.add("--shrink-level",
"-s",
"How much to focus on shrinking code size",
Options::Arguments::One,
[this](Options* o, const std::string& argument) {
passOptions.shrinkLevel = atoi(argument.c_str());
})
.add("--debuginfo",
"-g",
"Emit names section in wasm binary (or full debuginfo in wast)",
Options::Arguments::Zero,
[&](Options* o, const std::string& arguments) {
passOptions.debugInfo = true;
})
.add("--always-inline-max-function-size",
"-aimfs",
"Max size of functions that are always inlined (default " +
std::to_string(InliningOptions().alwaysInlineMaxSize) +
", which "
"is safe for use with -Os builds)",
Options::Arguments::One,
[this](Options* o, const std::string& argument) {
passOptions.inlining.alwaysInlineMaxSize =
static_cast<Index>(atoi(argument.c_str()));
})
.add("--flexible-inline-max-function-size",
"-fimfs",
"Max size of functions that are inlined when lightweight (no loops "
"or function calls) when optimizing aggressively for speed (-O3). "
"Default: " +
std::to_string(InliningOptions().flexibleInlineMaxSize),
Options::Arguments::One,
[this](Options* o, const std::string& argument) {
passOptions.inlining.flexibleInlineMaxSize =
static_cast<Index>(atoi(argument.c_str()));
})
.add("--one-caller-inline-max-function-size",
"-ocimfs",
"Max size of functions that are inlined when there is only one "
"caller (default " +
std::to_string(InliningOptions().oneCallerInlineMaxSize) +
"). Reason this is not unbounded is that some "
"implementations may have a hard time optimizing really large "
"functions",
Options::Arguments::One,
[this](Options* o, const std::string& argument) {
passOptions.inlining.oneCallerInlineMaxSize =
static_cast<Index>(atoi(argument.c_str()));
})
.add("--ignore-implicit-traps",
"-iit",
"Optimize under the helpful assumption that no surprising traps "
"occur (from load, div/mod, etc.)",
Options::Arguments::Zero,
[this](Options*, const std::string&) {
passOptions.ignoreImplicitTraps = true;
})
.add("--low-memory-unused",
"-lmu",
"Optimize under the helpful assumption that the low 1K of memory is "
"not used by the application",
Options::Arguments::Zero,
[this](Options*, const std::string&) {
passOptions.lowMemoryUnused = true;
});
// add passes in registry
for (const auto& p : PassRegistry::get()->getRegisteredNames()) {
(*this).add(
std::string("--") + p,
"",
PassRegistry::get()->getPassDescription(p),
Options::Arguments::Zero,
[this, p](Options*, const std::string&) { passes.push_back(p); });
}
}
bool runningDefaultOptimizationPasses() {
for (auto& pass : passes) {
if (pass == DEFAULT_OPT_PASSES) {
return true;
}
}
return false;
}
bool runningPasses() { return passes.size() > 0; }
void runPasses(Module& wasm) {
PassRunner passRunner(&wasm, passOptions);
if (debug) {
passRunner.setDebug(true);
}
for (auto& pass : passes) {
if (pass == DEFAULT_OPT_PASSES) {
passRunner.addDefaultOptimizationPasses();
} else {
passRunner.add(pass);
}
}
passRunner.run();
}
};
} // namespace wasm
#endif
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