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24473120a2
The purpose of refactoring is to hide operand roles from SwitchInst user (programmer). If you want to play with operands directly, probably you will need lower level methods than SwitchInst ones (TerminatorInst or may be User). After this patch we can reorganize SwitchInst operands and successors as we want. What was done: 1. Changed semantics of index inside the getCaseValue method: getCaseValue(0) means "get first case", not a condition. Use getCondition() if you want to resolve the condition. I propose don't mix SwitchInst case indexing with low level indexing (TI successors indexing, User's operands indexing), since it may be dangerous. 2. By the same reason findCaseValue(ConstantInt*) returns actual number of case value. 0 means first case, not default. If there is no case with given value, ErrorIndex will returned. 3. Added getCaseSuccessor method. I propose to avoid usage of TerminatorInst::getSuccessor if you want to resolve case successor BB. Use getCaseSuccessor instead, since internal SwitchInst organization of operands/successors is hidden and may be changed in any moment. 4. Added resolveSuccessorIndex and resolveCaseIndex. The main purpose of these methods is to see how case successors are really mapped in TerminatorInst. 4.1 "resolveSuccessorIndex" was created if you need to level down from SwitchInst to TerminatorInst. It returns TerminatorInst's successor index for given case successor. 4.2 "resolveCaseIndex" converts low level successors index to case index that curresponds to the given successor. Note: There are also related compatability fix patches for dragonegg, klee, llvm-gcc-4.0, llvm-gcc-4.2, safecode, clang. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149481 91177308-0d34-0410-b5e6-96231b3b80d8
114 lines
3.4 KiB
C++
114 lines
3.4 KiB
C++
//===-- CFGPrinter.h - CFG printer external interface -----------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines external functions that can be called to explicitly
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// instantiate the CFG printer.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_CFGPRINTER_H
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#define LLVM_ANALYSIS_CFGPRINTER_H
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#include "llvm/Constants.h"
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#include "llvm/Function.h"
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#include "llvm/Instructions.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/Support/CFG.h"
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#include "llvm/Support/GraphWriter.h"
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namespace llvm {
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template<>
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struct DOTGraphTraits<const Function*> : public DefaultDOTGraphTraits {
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DOTGraphTraits (bool isSimple=false) : DefaultDOTGraphTraits(isSimple) {}
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static std::string getGraphName(const Function *F) {
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return "CFG for '" + F->getName().str() + "' function";
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}
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static std::string getSimpleNodeLabel(const BasicBlock *Node,
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const Function *) {
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if (!Node->getName().empty())
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return Node->getName().str();
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std::string Str;
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raw_string_ostream OS(Str);
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WriteAsOperand(OS, Node, false);
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return OS.str();
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}
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static std::string getCompleteNodeLabel(const BasicBlock *Node,
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const Function *) {
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std::string Str;
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raw_string_ostream OS(Str);
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if (Node->getName().empty()) {
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WriteAsOperand(OS, Node, false);
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OS << ":";
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}
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OS << *Node;
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std::string OutStr = OS.str();
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if (OutStr[0] == '\n') OutStr.erase(OutStr.begin());
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// Process string output to make it nicer...
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for (unsigned i = 0; i != OutStr.length(); ++i)
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if (OutStr[i] == '\n') { // Left justify
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OutStr[i] = '\\';
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OutStr.insert(OutStr.begin()+i+1, 'l');
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} else if (OutStr[i] == ';') { // Delete comments!
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unsigned Idx = OutStr.find('\n', i+1); // Find end of line
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OutStr.erase(OutStr.begin()+i, OutStr.begin()+Idx);
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--i;
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}
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return OutStr;
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}
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std::string getNodeLabel(const BasicBlock *Node,
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const Function *Graph) {
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if (isSimple())
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return getSimpleNodeLabel(Node, Graph);
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else
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return getCompleteNodeLabel(Node, Graph);
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}
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static std::string getEdgeSourceLabel(const BasicBlock *Node,
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succ_const_iterator I) {
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// Label source of conditional branches with "T" or "F"
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if (const BranchInst *BI = dyn_cast<BranchInst>(Node->getTerminator()))
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if (BI->isConditional())
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return (I == succ_begin(Node)) ? "T" : "F";
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// Label source of switch edges with the associated value.
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if (const SwitchInst *SI = dyn_cast<SwitchInst>(Node->getTerminator())) {
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unsigned SuccNo = I.getSuccessorIndex();
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if (SuccNo == 0) return "def";
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std::string Str;
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raw_string_ostream OS(Str);
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unsigned Case = SI->resolveCaseIndex(SuccNo);
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OS << SI->getCaseValue(Case)->getValue();
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return OS.str();
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}
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return "";
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}
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};
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} // End llvm namespace
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namespace llvm {
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class FunctionPass;
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FunctionPass *createCFGPrinterPass ();
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FunctionPass *createCFGOnlyPrinterPass ();
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} // End llvm namespace
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#endif
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