-//===------------------------------------------------------------------------===
+//===----------------------------------------------------------------------===//
// LLVM 'GCCAS' UTILITY
//
// This utility is designed to be used by the GCC frontend for creating
// bytecode files from it's intermediate llvm assembly. The requirements for
// this utility are thus slightly different than that of the standard as util.
//
-//===------------------------------------------------------------------------===
+//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
+#include "llvm/PassManager.h"
#include "llvm/Assembly/Parser.h"
-#include "llvm/Transforms/CleanupGCCOutput.h"
-#include "llvm/Transforms/LevelChange.h"
-#include "llvm/Transforms/ConstantMerge.h"
-#include "llvm/Transforms/LowerAllocations.h"
-#include "llvm/Transforms/Scalar/DCE.h"
-#include "llvm/Transforms/Scalar/IndVarSimplify.h"
-#include "llvm/Transforms/Scalar/InstructionCombining.h"
-#include "llvm/Bytecode/Writer.h"
+#include "llvm/Transforms/RaisePointerReferences.h"
+#include "llvm/Transforms/IPO.h"
+#include "llvm/Transforms/Scalar.h"
+#include "llvm/Analysis/LoadValueNumbering.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/Bytecode/WriteBytecodePass.h"
+#include "llvm/Target/TargetData.h"
#include "Support/CommandLine.h"
+#include "Support/Signals.h"
#include <memory>
#include <fstream>
-#include <string>
+using std::cerr;
+
+// FIXME: This should eventually be parameterized...
+static TargetData TD("opt target");
+
+static cl::opt<std::string>
+InputFilename(cl::Positional, cl::desc("<input llvm assembly>"), cl::Required);
+
+static cl::opt<std::string>
+OutputFilename("o", cl::desc("Override output filename"),
+ cl::value_desc("filename"));
+
+static cl::opt<int>
+RunNPasses("stopAfterNPasses",
+ cl::desc("Only run the first N passes of gccas"), cl::Hidden,
+ cl::value_desc("# passes"));
+
+static cl::opt<bool>
+Verify("verify", cl::desc("Verify each pass result"));
+
+
+static inline void addPass(PassManager &PM, Pass *P) {
+ static int NumPassesCreated = 0;
+
+ // If we haven't already created the number of passes that was requested...
+ if (RunNPasses == 0 || RunNPasses > NumPassesCreated) {
+ // Add the pass to the pass manager...
+ PM.add(P);
+
+ // If we are verifying all of the intermediate steps, add the verifier...
+ if (Verify) PM.add(createVerifierPass());
+
+ // Keep track of how many passes we made for -stopAfterNPasses
+ ++NumPassesCreated;
+ } else {
+ delete P; // We don't want this pass to run, just delete it now
+ }
+}
+
+
+void AddConfiguredTransformationPasses(PassManager &PM) {
+ if (Verify) PM.add(createVerifierPass());
+
+ addPass(PM, createFunctionResolvingPass()); // Resolve (...) functions
+ addPass(PM, createGlobalDCEPass()); // Kill unused uinit g-vars
+ addPass(PM, createDeadTypeEliminationPass()); // Eliminate dead types
+ addPass(PM, createConstantMergePass()); // Merge dup global constants
+ addPass(PM, createVerifierPass()); // Verify that input is correct
+ addPass(PM, createDeadInstEliminationPass()); // Remove Dead code/vars
+ addPass(PM, createRaiseAllocationsPass()); // call %malloc -> malloc inst
+ addPass(PM, createIndVarSimplifyPass()); // Simplify indvars
+ addPass(PM, createRaisePointerReferencesPass(TD));// Recover type information
+ addPass(PM, createInstructionCombiningPass()); // Combine silly seq's
+ addPass(PM, createPromoteMemoryToRegister()); // Promote alloca's to regs
+ addPass(PM, createReassociatePass()); // Reassociate expressions
+ //addPass(PM, createCorrelatedExpressionEliminationPass());// Kill corr branches
+ addPass(PM, createInstructionCombiningPass()); // Combine silly seq's
+ addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
+ addPass(PM, createLICMPass()); // Hoist loop invariants
+ addPass(PM, createLoadValueNumberingPass()); // GVN for load instructions
+ addPass(PM, createGCSEPass()); // Remove common subexprs
+ addPass(PM, createSCCPPass()); // Constant prop with SCCP
+
+ // Run instcombine after redundancy elimination to exploit opportunities
+ // opened up by them.
+ addPass(PM, createInstructionCombiningPass());
+ addPass(PM, createAggressiveDCEPass()); // SSA based 'Agressive DCE'
+ addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
+}
-cl::String InputFilename ("", "Parse <arg> file, compile to bytecode",
- cl::Required, "");
-cl::String OutputFilename("o", "Override output filename", cl::NoFlags, "");
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv, " llvm .s -> .o assembler for GCC\n");
- ostream *Out = 0;
std::auto_ptr<Module> M;
try {
// Parse the file now...
M.reset(ParseAssemblyFile(InputFilename));
} catch (const ParseException &E) {
- cerr << E.getMessage() << endl;
+ cerr << argv[0] << ": " << E.getMessage() << "\n";
return 1;
}
if (M.get() == 0) {
- cerr << "assembly didn't read correctly.\n";
+ cerr << argv[0] << ": assembly didn't read correctly.\n";
return 1;
}
OutputFilename += ".o";
}
- Out = new std::ofstream(OutputFilename.c_str(), ios::out);
- if (!Out->good()) {
- cerr << "Error opening " << OutputFilename << "!\n";
+ std::ofstream Out(OutputFilename.c_str(), std::ios::out);
+ if (!Out.good()) {
+ cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
return 1;
}
+ // Make sure that the Out file gets unlink'd from the disk if we get a SIGINT
+ RemoveFileOnSignal(OutputFilename);
+
// In addition to just parsing the input from GCC, we also want to spiff it up
// a little bit. Do this now.
//
PassManager Passes;
- Passes.add(new DeadCodeElimination()); // Remove Dead code/vars
- Passes.add(new RaiseAllocations()); // call %malloc -> malloc inst
- Passes.add(new CleanupGCCOutput()); // Fix gccisms
- Passes.add(new InductionVariableSimplify()); // Simplify indvars
- Passes.add(new RaisePointerReferences()); // Eliminate casts
- Passes.add(new ConstantMerge()); // Merge dup global consts
- Passes.add(new InstructionCombining()); // Combine silly seq's
- Passes.add(new DeadCodeElimination()); // Remove Dead code/vars
-
- // Run our queue of passes all at once now, efficiently. This form of
- // runAllPasses frees the Pass objects after runAllPasses completes.
+
+ // Add all of the transformation passes to the pass manager to do the cleanup
+ // and optimization of the GCC output.
//
- Passes.run(M.get());
+ AddConfiguredTransformationPasses(Passes);
- WriteBytecodeToFile(M.get(), *Out);
+ // Write bytecode to file...
+ Passes.add(new WriteBytecodePass(&Out));
+
+ // Run our queue of passes all at once now, efficiently.
+ Passes.run(*M.get());
return 0;
}
-
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