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https://github.com/c64scene-ar/llvm-6502.git
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b10308e440
1. New parameter attribute called 'inreg'. It has meaning "place this parameter in registers, if possible". This is some generalization of gcc's regparm(n) attribute. It's currently used only in X86-32 backend. 2. Completely rewritten CC handling/lowering code inside X86 backend. Merged stdcall + c CCs and fastcall + fast CC. 3. Dropped CSRET CC. We cannot add struct return variant for each target-specific CC (e.g. stdcall + csretcc and so on). 4. Instead of CSRET CC introduced 'sret' parameter attribute. Setting in on first attribute has meaning 'This is hidden pointer to structure return. Handle it gently'. 5. Fixed small bug in llvm-extract + add new feature to FunctionExtraction pass, which relinks all internal-linkaged callees from deleted function to external linkage. This will allow further linking everything together. NOTEs: 1. Documentation will be updated soon. 2. llvm-upgrade should be improved to translate csret => sret. Before this, there will be some unexpected test fails. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33597 91177308-0d34-0410-b5e6-96231b3b80d8
140 lines
4.8 KiB
C++
140 lines
4.8 KiB
C++
//===-- ExtractFunction.cpp - Function extraction pass --------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This pass extracts
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Instructions.h"
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#include "llvm/Module.h"
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#include "llvm/Pass.h"
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#include "llvm/Transforms/IPO.h"
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using namespace llvm;
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namespace {
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class FunctionExtractorPass : public ModulePass {
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Function *Named;
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bool deleteFunc;
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bool reLink;
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public:
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/// FunctionExtractorPass - If deleteFn is true, this pass deletes as the
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/// specified function. Otherwise, it deletes as much of the module as
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/// possible, except for the function specified.
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///
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FunctionExtractorPass(Function *F = 0, bool deleteFn = true,
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bool relinkCallees = false)
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: Named(F), deleteFunc(deleteFn), reLink(relinkCallees) {}
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bool runOnModule(Module &M) {
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if (Named == 0) {
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Named = M.getMainFunction();
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if (Named == 0) return false; // No function to extract
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}
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if (deleteFunc)
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return deleteFunction();
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M.setModuleInlineAsm("");
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return isolateFunction(M);
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}
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bool deleteFunction() {
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// If we're in relinking mode, set linkage of all internal callees to
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// external. This will allow us extract function, and then - link
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// everything together
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if (reLink) {
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for (Function::iterator B = Named->begin(), BE = Named->end();
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B != BE; ++B) {
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for (BasicBlock::iterator I = B->begin(), E = B->end();
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I != E; ++I) {
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if (CallInst* callInst = dyn_cast<CallInst>(&*I)) {
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Function* Callee = callInst->getCalledFunction();
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if (Callee && Callee->hasInternalLinkage())
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Callee->setLinkage(GlobalValue::ExternalLinkage);
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}
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}
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}
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}
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Named->setLinkage(GlobalValue::ExternalLinkage);
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Named->deleteBody();
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assert(Named->isExternal() && "This didn't make the function external!");
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return true;
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}
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bool isolateFunction(Module &M) {
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// Make sure our result is globally accessible...
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Named->setLinkage(GlobalValue::ExternalLinkage);
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// Mark all global variables internal
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for (Module::global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
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if (!I->isExternal()) {
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I->setInitializer(0); // Make all variables external
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I->setLinkage(GlobalValue::ExternalLinkage);
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}
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// All of the functions may be used by global variables or the named
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// function. Loop through them and create a new, external functions that
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// can be "used", instead of ones with bodies.
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std::vector<Function*> NewFunctions;
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Function *Last = --M.end(); // Figure out where the last real fn is.
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for (Module::iterator I = M.begin(); ; ++I) {
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if (&*I != Named) {
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Function *New = new Function(I->getFunctionType(),
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GlobalValue::ExternalLinkage,
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I->getName());
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New->setCallingConv(I->getCallingConv());
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I->setName(""); // Remove Old name
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// If it's not the named function, delete the body of the function
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I->dropAllReferences();
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M.getFunctionList().push_back(New);
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NewFunctions.push_back(New);
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}
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if (&*I == Last) break; // Stop after processing the last function
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}
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// Now that we have replacements all set up, loop through the module,
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// deleting the old functions, replacing them with the newly created
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// functions.
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if (!NewFunctions.empty()) {
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unsigned FuncNum = 0;
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Module::iterator I = M.begin();
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do {
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if (&*I != Named) {
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// Make everything that uses the old function use the new dummy fn
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I->replaceAllUsesWith(NewFunctions[FuncNum++]);
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Function *Old = I;
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++I; // Move the iterator to the new function
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// Delete the old function!
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M.getFunctionList().erase(Old);
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} else {
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++I; // Skip the function we are extracting
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}
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} while (&*I != NewFunctions[0]);
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}
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return true;
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}
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};
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RegisterPass<FunctionExtractorPass> X("extract", "Function Extractor");
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}
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ModulePass *llvm::createFunctionExtractionPass(Function *F, bool deleteFn,
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bool relinkCallees) {
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return new FunctionExtractorPass(F, deleteFn, relinkCallees);
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}
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