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https://github.com/c64scene-ar/llvm-6502.git
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4d1e46e7b0
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2513 91177308-0d34-0410-b5e6-96231b3b80d8
80 lines
3.0 KiB
C++
80 lines
3.0 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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// Remove the unneccesary instruction now...
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BIL.remove(BI);
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// Make sure to propogate a name if there is one already...
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if (I->hasName() && !V->hasName())
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V->setName(I->getName(), BIL.getParent()->getSymbolTable());
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// Remove the dead instruction now...
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delete I;
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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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BI = BIL.insert(BI, I)+1; // Increment BI to point to instruction to delete
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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;
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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 *BB = From->getParent();
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BasicBlock::InstListType &BIL = BB->getInstList();
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BasicBlock::iterator BI = find(BIL.begin(), BIL.end(), From);
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assert(BI != BIL.end() && "Inst not in it's parents BB!");
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ReplaceInstWithInst(BIL, BI, To);
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}
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// InsertInstBeforeInst - Insert 'NewInst' into the basic block that 'Existing'
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// is already in, and put it right before 'Existing'. This instruction should
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// only be used when there is no iterator to Existing already around. The
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// returned iterator points to the new instruction.
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//
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BasicBlock::iterator InsertInstBeforeInst(Instruction *NewInst,
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Instruction *Existing) {
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BasicBlock *BB = Existing->getParent();
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BasicBlock::InstListType &BIL = BB->getInstList();
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BasicBlock::iterator BI = find(BIL.begin(), BIL.end(), Existing);
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assert(BI != BIL.end() && "Inst not in it's parents BB!");
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return BIL.insert(BI, NewInst);
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}
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