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* Revert to old behavior of ignoring a module if it doesn't contain a main

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function and no symbols were explicitly marked to be externalized.
* Add new -internalize-public-api-list option that can be used if the symbol
  list is small, and making a new file is annoying.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6289 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-05-22 19:48:00 +00:00
parent c7a2c7f0c9
commit 2345d71853
1 changed files with 24 additions and 7 deletions
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29
lib/Transforms/IPO/Internalize.cpp
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@ -22,16 +22,21 @@ namespace {
// external. // external.
cl::opt<std::string> cl::opt<std::string>
APIFile("internalize-public-api-file", cl::value_desc("filename"), APIFile("internalize-public-api-file", cl::value_desc("filename"),
cl::desc("A file containing list of globals to not internalize")); cl::desc("A file containing list of symbol names to preserve"));
// APIList - A list of symbols that should not be marked internal.
cl::list<std::string>
APIList("internalize-public-api-list", cl::value_desc("list"),
cl::desc("A list of symbol names to preserve"));
class InternalizePass : public Pass { class InternalizePass : public Pass {
std::set<std::string> ExternalNames; std::set<std::string> ExternalNames;
public: public:
InternalizePass() { InternalizePass() {
if (!APIFile.empty()) if (!APIFile.empty()) // If a filename is specified, use it
LoadFile(APIFile.c_str()); LoadFile(APIFile.c_str());
else else // Else, if a list is specified, use it.
ExternalNames.insert("main"); ExternalNames.insert(APIList.begin(), APIList.end());
} }
void LoadFile(const char *Filename) { void LoadFile(const char *Filename) {
@ -39,7 +44,7 @@ namespace {
std::ifstream In(Filename); std::ifstream In(Filename);
if (!In.good()) { if (!In.good()) {
std::cerr << "WARNING: Internalize couldn't load file '" << Filename std::cerr << "WARNING: Internalize couldn't load file '" << Filename
<< "'!: Not internalizing.\n"; << "'!\n";
return; // Do not internalize anything... return; // Do not internalize anything...
} }
while (In) { while (In) {
@ -51,7 +56,19 @@ namespace {
} }
virtual bool run(Module &M) { virtual bool run(Module &M) {
if (ExternalNames.empty()) return false; // Error loading file... // If no list or file of symbols was specified, check to see if there is a
// "main" symbol defined in the module. If so, use it, otherwise do not
// internalize the module, it must be a library or something.
//
if (ExternalNames.empty()) {
Function *MainFunc = M.getMainFunction();
if (MainFunc == 0 || MainFunc->isExternal())
return false; // No main found, must be a library...
// Preserve main, internalize all else.
ExternalNames.insert(MainFunc->getName());
}
bool Changed = false; bool Changed = false;
// Found a main function, mark all functions not named main as internal. // Found a main function, mark all functions not named main as internal.