public void BlockTerminates()
{
var m = new ProcedureBuilder();
m.Call(exit, 4);
var b = m.CurrentBlock;
m.Return();
var a = new TerminationAnalysis(flow);
flow[b] = CreateBlockFlow(b, m.Frame);
a.Analyze(b);
Assert.IsTrue(flow[b].TerminatesProcess);
}
public void BlockDoesntTerminate()
{
var m = new ProcedureBuilder();
m.Store(m.Word32(0x1231), m.Byte(0));
var b = m.Block;
m.Return();
var a = new TerminationAnalysis(flow);
prog = new Program
{
Architecture = new FakeArchitecture()
};
flow[b] = CreateBlockFlow(b, m.Frame);
a.Analyze(b);
Assert.IsFalse(flow[b].TerminatesProcess);
}
/// <summary>
/// Finds all interprocedural register dependencies (in- and out-parameters) and
/// abstracts them away by rewriting as calls.
/// </summary>
/// <returns>A RegisterLiveness object that summarizes the interprocedural register
/// liveness analysis. This information can be used to generate SSA form.
/// </returns>
public void UntangleProcedures()
{
eventListener.ShowStatus("Eliminating intra-block dead registers.");
IntraBlockDeadRegisters.Apply(program);
eventListener.ShowStatus("Finding terminating procedures.");
var term = new TerminationAnalysis(flow);
term.Analyze(program);
eventListener.ShowStatus("Finding trashed registers.");
var trf = new TrashedRegisterFinder(program, program.Procedures.Values, flow, eventListener);
trf.Compute();
eventListener.ShowStatus("Rewriting affine expressions.");
trf.RewriteBasicBlocks();
eventListener.ShowStatus("Computing register liveness.");
var rl = RegisterLiveness.Compute(program, flow, eventListener);
eventListener.ShowStatus("Rewriting calls.");
GlobalCallRewriter.Rewrite(program, flow);
}
public void ProcedureTerminatesIfBlockTerminates()
{
var proc = CompileProcedure("proc", delegate(ProcedureBuilder m)
{
m.Call(exit, 4);
m.Return();
});
var prog = progMock.BuildProgram();
flow = new ProgramDataFlow(prog);
var a = new TerminationAnalysis(flow);
a.Analyze(proc);
Assert.IsTrue(flow[proc].TerminatesProcess);
}
public void TerminatingApplication()
{
var test= CompileProcedure("test", m =>
{
m.SideEffect(m.Fn(new ProcedureConstant(PrimitiveType.Pointer32, exit)));
m.FinishProcedure();
});
var prog = progMock.BuildProgram();
flow = new ProgramDataFlow(prog);
var a = new TerminationAnalysis(flow);
a.Analyze(test);
Assert.IsTrue(flow[test].TerminatesProcess);
}
public void TerminatingSubProcedure()
{
var sub = CompileProcedure("sub", m =>
{
m.Call(exit, 4);
m.FinishProcedure();
});
Procedure caller = CompileProcedure("caller", m =>
{
m.Call(sub, 4);
m.Return();
});
var prog = progMock.BuildProgram();
flow = new ProgramDataFlow(prog);
var a = new TerminationAnalysis(flow);
a.Analyze(prog);
Assert.IsTrue(flow[sub].TerminatesProcess);
Assert.IsTrue(flow[caller].TerminatesProcess);
}
public void ProcedureTerminatesIfAllBranchesDo()
{
var proc = CompileProcedure("proc", m =>
{
m.BranchIf(m.Eq(m.Local32("foo"), m.Word32(0)), "whee");
m.Call(exit, 4);
m.FinishProcedure();
m.Label("whee");
m.Call(exit, 4);
m.FinishProcedure();
});
var prog = progMock.BuildProgram();
flow = new ProgramDataFlow(prog);
var a = new TerminationAnalysis(flow);
a.Analyze(proc);
Assert.IsTrue(flow[proc].TerminatesProcess);
}
public void ProcedureDoesntTerminatesIfOneBranchDoesnt()
{
var proc = CompileProcedure("proc", delegate(ProcedureBuilder m)
{
m.BranchIf(m.Eq(m.Local32("foo"), m.Word32(0)), "bye");
m.Call(exit, 4);
m.Label("bye");
m.Return();
});
var prog = progMock.BuildProgram();
flow = new ProgramDataFlow(prog);
var a = new TerminationAnalysis(flow);
a.Analyze(proc);
Assert.IsFalse(flow[proc].TerminatesProcess);
}