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public void CreateArgAllocas(Function function, IRBuilder builder) { for(int i = 0; i < function.ArgCount; ++i) { Value alloca = builder.BuildEntryBlockAlloca(function, TypeRef.CreateDouble(), this.Args[i]); builder.BuildStore(function.GetParameter((uint)i), alloca); CodeGenManager.NamedValues[this.Args[i]] = alloca; } }
public override Value CodeGen(IRBuilder builder) { // Output this as: // var = alloca double // ... // start = startexpr // store start -> var // goto loop // loop: // ... // bodyexpr // ... // loopend: // step = stepexpr // endcond = endexpr // // curvar = load var // nextvar = curvar + step // store nextvar -> var // br endcond, loop, endloop // outloop: BasicBlock startBlock = builder.GetInsertPoint(); Function func = startBlock.GetParent(); Value alloca = builder.BuildEntryBlockAlloca(func, TypeRef.CreateDouble(), this.VarName); Value startV = this.Start.CodeGen(builder); if(startV.IsNull) return startV; builder.BuildStore(startV, alloca); BasicBlock loopBB = func.AppendBasicBlock("loop"); builder.BuildBr(loopBB); builder.SetInsertPoint(loopBB); /* Within the loop, the variable is defined equal to the PHI node. If it * shadows an existing variable, we have to restore it, so save it * now. */ Value oldVal = Value.Null; CodeGenManager.NamedValues.TryGetValue(this.VarName, out oldVal); CodeGenManager.NamedValues[this.VarName] = alloca; /* Emit the body of the loop. This, like any other expr, can change the * current BB. Note that we ignore the value computed by the body, but * don't allow an error */ Body.CodeGen(builder); // Emit the step value; Value stepV = Value.Null; if(this.Step != null) stepV = this.Step.CodeGen(builder); else stepV = Value.CreateConstDouble(1); // Compute the end condition Value endCond = this.End.CodeGen(builder); endCond = builder.BuildFCmp(endCond, LLVMRealPredicate.RealONE, Value.CreateConstDouble(0), "loopcond"); Value curvar = builder.BuildLoad(alloca, VarName); Value nextVar = builder.BuildFAdd(curvar, stepV, "nextvar"); builder.BuildStore(nextVar, alloca); BasicBlock loopEndBB = builder.GetInsertPoint(); BasicBlock afterBB = func.AppendBasicBlock("afterloop"); builder.BuildCondBr(endCond, loopBB, afterBB); builder.SetInsertPoint(afterBB); if(!oldVal.IsNull) CodeGenManager.NamedValues[this.VarName] = oldVal; else CodeGenManager.NamedValues.Remove(this.VarName); return Value.CreateConstDouble(0); }