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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2777 91177308-0d34-0410-b5e6-96231b3b80d8
61 lines
2.2 KiB
C++
61 lines
2.2 KiB
C++
//===-- BasicBlockUtils.cpp - BasicBlock Utilities -------------------------==//
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//
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// This family of functions perform manipulations on basic blocks, and
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// instructions contained within basic blocks.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Utils/BasicBlockUtils.h"
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#include "llvm/Function.h"
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#include "llvm/Instruction.h"
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#include <algorithm>
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// ReplaceInstWithValue - Replace all uses of an instruction (specified by BI)
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// with a value, then remove and delete the original instruction.
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//
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void ReplaceInstWithValue(BasicBlock::InstListType &BIL,
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BasicBlock::iterator &BI, Value *V) {
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Instruction &I = *BI;
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// Replaces all of the uses of the instruction with uses of the value
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I.replaceAllUsesWith(V);
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std::string OldName = I.getName();
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// Delete the unneccesary instruction now...
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BI = BIL.erase(BI);
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// Make sure to propogate a name if there is one already...
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if (OldName.size() && !V->hasName())
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V->setName(OldName, BIL.getParent()->getSymbolTable());
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}
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// ReplaceInstWithInst - Replace the instruction specified by BI with the
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// instruction specified by I. The original instruction is deleted and BI is
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// updated to point to the new instruction.
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//
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void ReplaceInstWithInst(BasicBlock::InstListType &BIL,
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BasicBlock::iterator &BI, Instruction *I) {
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assert(I->getParent() == 0 &&
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"ReplaceInstWithInst: Instruction already inserted into basic block!");
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// Insert the new instruction into the basic block...
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BasicBlock::iterator New = BIL.insert(BI, I);
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// Replace all uses of the old instruction, and delete it.
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ReplaceInstWithValue(BIL, BI, I);
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// Move BI back to point to the newly inserted instruction
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BI = New;
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}
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// ReplaceInstWithInst - Replace the instruction specified by From with the
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// instruction specified by To. Note that this is slower than providing an
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// iterator directly, because the basic block containing From must be searched
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// for the instruction.
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//
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void ReplaceInstWithInst(Instruction *From, Instruction *To) {
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BasicBlock::iterator BI(From);
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ReplaceInstWithInst(From->getParent()->getInstList(), BI, To);
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}
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