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Convert llvm-ld to use the PluginLoader like opt instead of having its

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one-off (and broken) RunOptimizations function. Also, run some cleanup
passes after the user's loaded passes run. This make sure to clean up
any cruft left around by thos passes.

This patch was inspired by a patch submitted by Bram Adams.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29781 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2006-08-20 19:18:36 +00:00
parent 3717ca965b
commit 8e33fae0ed
1 changed files with 31 additions and 19 deletions
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50
tools/llvm-ld/Optimize.cpp
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@ -19,12 +19,19 @@
#include "llvm/Support/CommandLine.h"
#include "llvm/System/DynamicLibrary.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Support/PassNameParser.h"
#include "llvm/Support/PluginLoader.h"
using namespace llvm;
// Optimization Options
// Pass Name Options as generated by the PassNameParser
static cl::list<const PassInfo*, bool,
FilteredPassNameParser<PassInfo::Optimization> >
OptimizationList(cl::desc("Optimizations available:"));
// Optimization Enumeration
enum OptimizationLevels {
OPT_FAST_COMPILE = 1,
OPT_SIMPLE = 2,
@ -33,6 +40,7 @@ enum OptimizationLevels {
OPT_AGGRESSIVE_LINK_TIME = 5
};
// Optimization Options
static cl::opt<OptimizationLevels> OptLevel(
cl::desc("Choose level of optimization to apply:"),
cl::init(OPT_FAST_COMPILE), cl::values(
@ -72,10 +80,6 @@ static cl::alias ExportDynamic("export-dynamic",
cl::aliasopt(DisableInternalize),
cl::desc("Alias for -disable-internalize"));
static cl::list<std::string> LoadableModules("load",
cl::value_desc("path"),
cl::desc("Load an optimization module and run it"));
// A utility function that adds a pass to the pass manager but will also add
// a verifier pass after if we're supposed to verify.
static inline void addPass(PassManager &PM, Pass *P) {
@ -150,9 +154,8 @@ void Optimize(Module* M) {
addPass(Passes, createScalarReplAggregatesPass()); // Break up allocas
// Run a few AA driven optimizations here and now, to cleanup the code.
// Run a few AA driven optimizations, to cleanup the code.
addPass(Passes, createGlobalsModRefPass()); // IP alias analysis
addPass(Passes, createLICMPass()); // Hoist loop invariants
addPass(Passes, createLoadValueNumberingPass()); // GVN for load instrs
addPass(Passes, createGCSEPass()); // Remove common subexprs
@ -168,18 +171,27 @@ void Optimize(Module* M) {
addPass(Passes, createGlobalDCEPass());
}
std::vector<std::string> plugins = LoadableModules;
for (std::vector<std::string>::iterator I = plugins.begin(),
E = plugins.end(); I != E; ++I) {
sys::DynamicLibrary dll(I->c_str());
typedef void (*OptimizeFunc)(PassManager&,int);
OptimizeFunc OF = OptimizeFunc(
(intptr_t)dll.GetAddressOfSymbol("RunOptimizations"));
if (OF == 0) {
throw std::string("Optimization Module '") + *I +
"' is missing the RunOptimizations symbol";
}
(*OF)(Passes,OptLevel);
// Create a new optimization pass for each one specified on the command line
std::auto_ptr<TargetMachine> target;
for (unsigned i = 0; i < OptimizationList.size(); ++i) {
const PassInfo *Opt = OptimizationList[i];
if (Opt->getNormalCtor())
Passes.add(Opt->getNormalCtor()());
else if (Opt->getTargetCtor()) {
assert(target.get() && "Could not allocate target machine!");
Passes.add(Opt->getTargetCtor()(*target.get()));
} else
std::cerr << "llvm-ld: cannot create pass: " << Opt->getPassName()
<< "\n";
}
// The user's passes may leave cruft around. Clean up after them them but
// only if we haven't got DisableOptimizations set
if (!DisableOptimizations) {
addPass(Passes, createInstructionCombiningPass());
addPass(Passes, createCFGSimplificationPass());
addPass(Passes, createGlobalDCEPass());
}
// Make sure everything is still good.