+//===-- gccas.cpp - The "optimizing assembler" used by the GCC frontend ---===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
-// 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.
+// This utility is designed to be used by the GCC frontend for creating bytecode
+// files from its 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/RaisePointerReferences.h"
-#include "llvm/Transforms/IPO.h"
-#include "llvm/Transforms/Scalar.h"
#include "llvm/Analysis/LoadValueNumbering.h"
#include "llvm/Analysis/Verifier.h"
+#include "llvm/Assembly/Parser.h"
#include "llvm/Bytecode/WriteBytecodePass.h"
#include "llvm/Target/TargetData.h"
-#include "Support/CommandLine.h"
-#include "Support/Signals.h"
+#include "llvm/Transforms/IPO.h"
+#include "llvm/Transforms/Scalar.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/System/Signals.h"
#include <memory>
#include <fstream>
-using std::cerr;
-// FIXME: This should eventually be parameterized...
-static TargetData TD("opt target");
+using namespace llvm;
+
+namespace {
+ cl::opt<std::string>
+ InputFilename(cl::Positional,cl::desc("<input llvm assembly>"),cl::init("-"));
+
+ cl::opt<std::string>
+ OutputFilename("o", cl::desc("Override output filename"),
+ cl::value_desc("filename"));
+
+ cl::opt<bool>
+ Verify("verify", cl::desc("Verify each pass result"));
-static cl::opt<std::string>
-InputFilename(cl::Positional, cl::desc("<input llvm assembly>"), cl::Required);
+ cl::opt<bool>
+ DisableInline("disable-inlining", cl::desc("Do not run the inliner pass"));
-static cl::opt<std::string>
-OutputFilename("o", cl::desc("Override output filename"),
- cl::value_desc("filename"));
+ cl::opt<bool>
+ DisableOptimizations("disable-opt",
+ cl::desc("Do not run any optimization passes"));
-static cl::opt<int>
-RunNPasses("stopAfterNPasses",
- cl::desc("Only run the first N passes of gccas"), cl::Hidden,
- cl::value_desc("# passes"));
+ cl::opt<bool>
+ StripDebug("strip-debug",
+ cl::desc("Strip debugger symbol info from translation unit"));
-static cl::opt<bool>
-Verify("verify", cl::desc("Verify each pass result"));
+ cl::opt<bool>
+ NoCompress("disable-compression", cl::init(false),
+ cl::desc("Don't compress the generated bytecode"));
+
+ cl::opt<bool> TF("traditional-format", cl::Hidden,
+ cl::desc("Compatibility option: ignored"));
+}
static inline void addPass(PassManager &PM, Pass *P) {
- static int NumPassesCreated = 0;
+ // Add the pass to the pass manager...
+ PM.add(P);
- // 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
- }
+ // If we are verifying all of the intermediate steps, add the verifier...
+ if (Verify) PM.add(createVerifierPass());
}
void AddConfiguredTransformationPasses(PassManager &PM) {
- if (Verify) PM.add(createVerifierPass());
+ PM.add(createVerifierPass()); // Verify that input is correct
+ addPass(PM, createLowerSetJmpPass()); // Lower llvm.setjmp/.longjmp
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
+
+ // If the -strip-debug command line option was specified, do it.
+ if (StripDebug)
+ addPass(PM, createStripSymbolsPass(true));
+
+ if (DisableOptimizations) return;
+
addPass(PM, createRaiseAllocationsPass()); // call %malloc -> malloc inst
- addPass(PM, createIndVarSimplifyPass()); // Simplify indvars
- addPass(PM, createRaisePointerReferencesPass(TD));// Recover type information
+ addPass(PM, createCFGSimplificationPass()); // Clean up disgusting code
+ addPass(PM, createPromoteMemoryToRegister()); // Kill useless allocas
+ addPass(PM, createGlobalOptimizerPass()); // Optimize out global vars
+ addPass(PM, createGlobalDCEPass()); // Remove unused fns and globs
+ addPass(PM, createIPConstantPropagationPass());// IP Constant Propagation
+ addPass(PM, createDeadArgEliminationPass()); // Dead argument elimination
+ addPass(PM, createInstructionCombiningPass()); // Clean up after IPCP & DAE
+ addPass(PM, createCFGSimplificationPass()); // Clean up after IPCP & DAE
+
+ addPass(PM, createPruneEHPass()); // Remove dead EH info
+
+ if (!DisableInline)
+ addPass(PM, createFunctionInliningPass()); // Inline small functions
+ addPass(PM, createArgumentPromotionPass()); // Scalarize uninlined fn args
+
+ addPass(PM, createRaisePointerReferencesPass());// Recover type information
+ addPass(PM, createTailDuplicationPass()); // Simplify cfg by copying code
+ addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
+ addPass(PM, createScalarReplAggregatesPass()); // Break up aggregate allocas
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, createTailCallEliminationPass()); // Eliminate tail calls
addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
addPass(PM, createLICMPass()); // Hoist loop invariants
+ addPass(PM, createInstructionCombiningPass()); // Clean up after the unroller
+ addPass(PM, createIndVarSimplifyPass()); // Canonicalize indvars
+ addPass(PM, createLoopUnrollPass()); // Unroll small loops
+ addPass(PM, createInstructionCombiningPass()); // Clean up after the unroller
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, createDeadStoreEliminationPass()); // Delete dead stores
+ addPass(PM, createAggressiveDCEPass()); // SSA based 'Aggressive DCE'
addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
+ addPass(PM, createDeadTypeEliminationPass()); // Eliminate dead types
+ addPass(PM, createConstantMergePass()); // Merge dup global constants
}
int main(int argc, char **argv) {
- cl::ParseCommandLineOptions(argc, argv, " llvm .s -> .o assembler for GCC\n");
-
- std::auto_ptr<Module> M;
try {
- // Parse the file now...
- M.reset(ParseAssemblyFile(InputFilename));
- } catch (const ParseException &E) {
- cerr << argv[0] << ": " << E.getMessage() << "\n";
- return 1;
- }
+ cl::ParseCommandLineOptions(argc, argv,
+ " llvm .s -> .o assembler for GCC\n");
+ sys::PrintStackTraceOnErrorSignal();
+
+ std::auto_ptr<Module> M;
+ try {
+ // Parse the file now...
+ M.reset(ParseAssemblyFile(InputFilename));
+ } catch (const ParseException &E) {
+ std::cerr << argv[0] << ": " << E.getMessage() << "\n";
+ return 1;
+ }
- if (M.get() == 0) {
- cerr << argv[0] << ": assembly didn't read correctly.\n";
- return 1;
- }
-
- if (OutputFilename == "") { // Didn't specify an output filename?
- std::string IFN = InputFilename;
- int Len = IFN.length();
- if (IFN[Len-2] == '.' && IFN[Len-1] == 's') { // Source ends in .s?
- OutputFilename = std::string(IFN.begin(), IFN.end()-2);
- } else {
- OutputFilename = IFN; // Append a .o to it
+ if (M.get() == 0) {
+ std::cerr << argv[0] << ": assembly didn't read correctly.\n";
+ return 1;
}
- OutputFilename += ".o";
- }
- std::ofstream Out(OutputFilename.c_str(), std::ios::out);
- if (!Out.good()) {
- cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
- return 1;
- }
+ std::ostream *Out = 0;
+ if (OutputFilename == "") { // Didn't specify an output filename?
+ if (InputFilename == "-") {
+ OutputFilename = "-";
+ } else {
+ std::string IFN = InputFilename;
+ int Len = IFN.length();
+ if (IFN[Len-2] == '.' && IFN[Len-1] == 's') { // Source ends in .s?
+ OutputFilename = std::string(IFN.begin(), IFN.end()-2);
+ } else {
+ OutputFilename = IFN; // Append a .o to it
+ }
+ OutputFilename += ".o";
+ }
+ }
+
+ if (OutputFilename == "-")
+ Out = &std::cout;
+ else {
+ Out = new std::ofstream(OutputFilename.c_str(), std::ios::out);
+
+ // Make sure that the Out file gets unlinked from the disk if we get a
+ // signal
+ sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+ }
- // Make sure that the Out file gets unlink'd from the disk if we get a SIGINT
- RemoveFileOnSignal(OutputFilename);
+
+ if (!Out->good()) {
+ std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
+ return 1;
+ }
+
+ // In addition to just parsing the input from GCC, we also want to spiff it up
+ // a little bit. Do this now.
+ //
+ PassManager Passes;
+
+ // Add an appropriate TargetData instance for this module...
+ Passes.add(new TargetData("gccas", M.get()));
- // In addition to just parsing the input from GCC, we also want to spiff it up
- // a little bit. Do this now.
- //
- PassManager Passes;
+ // Add all of the transformation passes to the pass manager to do the cleanup
+ // and optimization of the GCC output.
+ //
+ AddConfiguredTransformationPasses(Passes);
- // Add all of the transformation passes to the pass manager to do the cleanup
- // and optimization of the GCC output.
- //
- AddConfiguredTransformationPasses(Passes);
+ // Make sure everything is still good.
+ Passes.add(createVerifierPass());
- // Write bytecode to file...
- Passes.add(new WriteBytecodePass(&Out));
+ // Write bytecode to file...
+ Passes.add(new WriteBytecodePass(Out,false,!NoCompress));
- // Run our queue of passes all at once now, efficiently.
- Passes.run(*M.get());
- return 0;
+ // Run our queue of passes all at once now, efficiently.
+ Passes.run(*M.get());
+
+ if (Out != &std::cout) delete Out;
+ return 0;
+ } catch (const std::string& msg) {
+ std::cerr << argv[0] << ": " << msg << "\n";
+ } catch (...) {
+ std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
+ }
+ return 1;
}