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GCCLD actually does transformations to simplify the linked program now.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2155 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-04-08 00:14:58 +00:00
parent b579400cd7
commit ad202a0620
2 changed files with 33 additions and 10 deletions
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2
tools/gccld/Makefile
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@ -1,6 +1,6 @@
LEVEL = ../..
TOOLNAME = gccld
USEDLIBS = transforms bcreader bcwriter analysis vmcore support
USEDLIBS = transforms ipo ipa analysis scalaropts target bcreader bcwriter vmcore support
include $(LEVEL)/Makefile.common

41
tools/gccld/gccld.cpp
View File

@ -15,9 +15,13 @@
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Linker.h"
#include "llvm/Bytecode/Reader.h"
#include "llvm/Bytecode/Writer.h"
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/Bytecode/Reader.h"
#include "llvm/Bytecode/WriteBytecodePass.h"
#include "llvm/Transforms/CleanupGCCOutput.h"
#include "llvm/Transforms/ConstantMerge.h"
#include "llvm/Transforms/IPO/GlobalDCE.h"
#include "Support/CommandLine.h"
#include <fstream>
#include <memory>
@ -115,29 +119,48 @@ int main(int argc, char **argv) {
}
}
// In addition to just parsing the input from GCC, we also want to spiff it up
// a little bit. Do this now.
//
PassManager Passes;
// Linking modules together can lead to duplicated global constants, only keep
// one copy of each constant...
//
Passes.add(createConstantMergePass());
// Often if the programmer does not specify proper prototypes for the
// functions they are calling, they end up calling a vararg version of the
// function that does not get a body filled in (the real function has typed
// arguments). This pass merges the two functions, among other things.
//
Passes.add(createCleanupGCCOutputPass());
// Now that composite has been compiled, scan through the module, looking for
// a main function. If main is defined, mark all other functions internal.
//
// TODO:
// Next run globaldce...
// next ?
// Now that we have optimized the program, discard unreachable functions...
//
Passes.add(createGlobalDCEPass());
// Add the pass that writes bytecode to the output file...
std::ofstream Out((OutputFilename+".bc").c_str());
if (!Out.good()) {
cerr << "Error opening '" << OutputFilename << ".bc' for writing!\n";
return 1;
}
Passes.add(new WriteBytecodePass(&Out)); // Write bytecode to file...
if (Verbose) cerr << "Writing bytecode...\n";
WriteBytecodeToFile(Composite.get(), Out);
// Run our queue of passes all at once now, efficiently.
Passes.run(Composite.get());
Out.close();
// Output the script to start the program...
std::ofstream Out2(OutputFilename.c_str());
if (!Out2.good()) {
cerr << "Error openeing '" << OutputFilename << "' for writing!\n";
cerr << "Error opening '" << OutputFilename << "' for writing!\n";
return 1;
}
Out2 << "#!/bin/sh\nlli -q $0.bc $*\n";