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Fix tracing code support to link in the tracing routines if neccesary.

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This is required because trace code can insert calls to functions that
are (now) in an LLVM library, not a native library.

This change makes it easier to use the tracing code because the native
link options don't have to change, and it fits in a lot better with the
LLVM model.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2675 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-05-20 21:20:08 +00:00
parent 1ee34a5a5b
commit 39fd659d68
1 changed files with 74 additions and 37 deletions
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111
tools/llc/llc.cpp
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@ -10,6 +10,7 @@
#include "llvm/Transforms/Instrumentation/TraceValues.h"
#include "llvm/Transforms/ChangeAllocations.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Utils/Linker.h"
#include "llvm/Assembly/PrintModulePass.h"
#include "llvm/Bytecode/WriteBytecodePass.h"
#include "llvm/Transforms/ConstantMerge.h"
@ -26,6 +27,7 @@ static cl::String InputFilename ("", "Input filename", cl::NoFlags, "-");
static cl::String OutputFilename("o", "Output filename", cl::NoFlags, "");
static cl::Flag Force ("f", "Overwrite output files");
static cl::Flag DumpAsm ("d", "Print bytecode before native code generation", cl::Hidden);
static cl::String TraceLibPath ("tracelibpath", "Path to libinstr for trace code", cl::Hidden, "");
enum TraceLevel {
TraceOff, TraceFunctions, TraceBasicBlocks
@ -51,6 +53,75 @@ static inline string GetFileNameRoot(const string &InputFilename) {
return outputFilename;
}
static void insertTraceCodeFor(Module *M) {
PassManager Passes;
// Insert trace code in all functions in the module
switch (TraceValues) {
case TraceBasicBlocks:
Passes.add(createTraceValuesPassForBasicBlocks());
break;
case TraceFunctions:
Passes.add(createTraceValuesPassForFunction());
break;
default:
assert(0 && "Bad value for TraceValues!");
abort();
}
// Eliminate duplication in constant pool
Passes.add(createDynamicConstantMergePass());
// Run passes to insert and clean up trace code...
Passes.run(M);
std::string ErrorMessage;
// Load the module that contains the runtime helper routines neccesary for
// pointer hashing and stuff... link this module into the program if possible
//
Module *TraceModule = ParseBytecodeFile(TraceLibPath+"libinstr.bc");
// Ok, the TraceLibPath didn't contain a valid module. Try to load the module
// from the current LLVM-GCC install directory. This is kindof a hack, but
// allows people to not HAVE to have built the library.
//
if (TraceModule == 0)
TraceModule = ParseBytecodeFile("/home/vadve/lattner/cvs/gcc_install/lib/"
"gcc-lib/llvm/3.1/libinstr.bc");
// If we still didn't get it, cancel trying to link it in...
if (TraceModule == 0) {
cerr << "Warning, could not load trace routines to link into program!\n";
} else {
// Link in the trace routines... if the link fails, don't panic, because the
// compile should still succeed, just the native linker will probably fail.
//
std::auto_ptr<Module> TraceRoutines(TraceModule);
if (LinkModules(M, TraceRoutines.get(), &ErrorMessage))
cerr << "Warning: Error linking in trace routines: "
<< ErrorMessage << "\n";
}
// Write out the module with tracing code just before code generation
if (InputFilename != "-") {
string TraceFilename = GetFileNameRoot(InputFilename) + ".trace.bc";
std::ofstream Out(TraceFilename.c_str());
if (!Out.good()) {
cerr << "Error opening '" << TraceFilename
<< "'!: Skipping output of trace code as bytecode\n";
} else {
cerr << "Emitting trace code to '" << TraceFilename
<< "' for comparison...\n";
WriteBytecodeToFile(M, Out);
}
}
}
//===---------------------------------------------------------------------===//
// Function main()
@ -75,49 +146,15 @@ int main(int argc, char **argv) {
return 1;
}
if (TraceValues != TraceOff) // If tracing enabled...
insertTraceCodeFor(M.get()); // Hack up module before using passmanager...
// Build up all of the passes that we want to do to the module...
PassManager Passes;
if (TraceValues != TraceOff) { // If tracing enabled...
// Insert trace code in all functions in the module
if (TraceValues == TraceBasicBlocks)
Passes.add(createTraceValuesPassForBasicBlocks());
else if (TraceValues == TraceFunctions)
Passes.add(createTraceValuesPassForFunction());
else
assert(0 && "Bad value for TraceValues!");
// Eliminate duplication in constant pool
Passes.add(createDynamicConstantMergePass());
}
// Decompose multi-dimensional refs into a sequence of 1D refs
Passes.add(createDecomposeMultiDimRefsPass());
// Write out the module with tracing code just before code generation
if (TraceValues != TraceOff) { // If tracing enabled...
assert(InputFilename != "-" &&
"files on stdin not supported with tracing");
string traceFileName = GetFileNameRoot(InputFilename) + ".trace.bc";
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
cerr << "Error opening '" << OutputFilename << "': File exists!\n"
<< "Use -f command line argument to force output\n";
return 1;
}
std::ostream *os = new std::ofstream(traceFileName.c_str());
if (!os->good()) {
cerr << "Error opening " << traceFileName
<< "! SKIPPING OUTPUT OF TRACE CODE\n";
delete os;
return 1;
}
Passes.add(new WriteBytecodePass(os, true));
}
// Replace malloc and free instructions with library calls.
// Do this after tracing until lli implements these lib calls.
// For now, it will emulate malloc and free internally.