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Add '-singleobj' command line switch that will tell LDC to link LLVM modules internally and only emit a single object file.

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The switch allows the optimizer and inliner to run on all modules at once and opens the door for template instantiation improvements that should lower compile time and executable size.
This commit is contained in:
Christian Kamm
2009-03-07 19:38:00 +01:00
parent ed9591d81f
commit 95f12f04f1
4 changed files with 78 additions and 26 deletions
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50
gen/main.cpp
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@@ -4,6 +4,7 @@
// which uses the llvm license
#include "gen/llvm.h"
#include "llvm/Linker.h"
#include "llvm/Target/SubtargetFeature.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetMachineRegistry.h"
@@ -32,6 +33,7 @@
#include "gen/logger.h"
#include "gen/linker.h"
#include "gen/irstate.h"
#include "gen/toobj.h"
#include "gen/cl_options.h"
#include "gen/cl_helpers.h"
@@ -41,6 +43,10 @@ extern void getenv_setargv(const char *envvar, int *pargc, char** *pargv);
extern void backend_init();
extern void backend_term();
static cl::opt<bool> singleObj("singleobj",
cl::desc("Create only a single output object file"),
cl::ZeroOrMore);
static cl::opt<bool> noDefaultLib("nodefaultlib",
cl::desc("Don't add a default library for linking implicitly"),
cl::ZeroOrMore);
@@ -796,6 +802,9 @@ int main(int argc, char** argv)
if (global.errors)
fatal();
// collects llvm modules to be linked if singleobj is passed
std::vector<llvm::Module*> llvmModules;
// Generate output files
for (int i = 0; i < modules.dim; i++)
{
@@ -804,8 +813,16 @@ int main(int argc, char** argv)
printf("code %s\n", m->toChars());
if (global.params.obj)
{
m->genobjfile(0);
global.params.objfiles->push(m->objfile->name->str);
llvm::Module* lm = m->genLLVMModule(0);
if (!singleObj)
{
m->deleteObjFile();
writeModule(lm, m->objfile->name->str);
global.params.objfiles->push(m->objfile->name->str);
delete lm;
}
else
llvmModules.push_back(lm);
}
if (global.errors)
m->deleteObjFile();
@@ -815,7 +832,34 @@ int main(int argc, char** argv)
m->gendocfile();
}
}
// internal linking for singleobj
if (singleObj && llvmModules.size() > 0)
{
Module* m = (Module*)modules.data[0];
char* name = m->toChars();
char* filename = m->objfile->name->str;
llvm::Linker linker(name, name);
std::string errormsg;
for (int i = 0; i < llvmModules.size(); i++)
{
if(linker.LinkInModule(llvmModules[i], &errormsg))
error(errormsg.c_str());
delete llvmModules[i];
}
// workaround for llvm::Linker bug, see llvm #3749
llvm::GlobalVariable* ctors = linker.getModule()->getGlobalVariable("llvm.global_ctors");
if (ctors)
while (ctors->getNumUses() > 0)
delete *ctors->use_begin();
m->deleteObjFile();
writeModule(linker.getModule(), filename);
global.params.objfiles->push(filename);
}
backend_term();
if (global.errors)
fatal();