/// <summary>
/// Creates a control-flow graph that contains only an empty
/// entry point block.
/// </summary>
public FlowGraph()
{
this.instructions = ImmutableDictionary.Create <ValueTag, Instruction>();
this.blocks = ImmutableOrderedDictionary.Create <BasicBlockTag, BasicBlockData>();
this.blockParamTypes = ImmutableDictionary.Create <ValueTag, IType>();
this.valueParents = ImmutableDictionary.Create <ValueTag, BasicBlockTag>();
this.analysisCache = new MacroAnalysisCache();
this.EntryPointTag = new BasicBlockTag("entry-point");
this.blocks = this.blocks.SetItem(
this.EntryPointTag,
new BasicBlockData());
}
/// <summary>
/// Applies a member mapping to this flow graph.
/// </summary>
/// <param name="mapping">A member mapping.</param>
/// <returns>A transformed flow graph.</returns>
public FlowGraph Map(MemberMapping mapping)
{
// Apply the mapping to all instructions.
var newInstructionMap = ImmutableDictionary
.Create <ValueTag, Instruction>()
.ToBuilder();
foreach (var insnPair in instructions)
{
newInstructionMap[insnPair.Key] = insnPair.Value.Map(mapping);
}
// Apply the mapping to all basic blocks.
var newBlockMap = ImmutableOrderedDictionary
.Create <BasicBlockTag, BasicBlockData>()
.ToBuilder();
var newParamTypeMap = ImmutableDictionary
.Create <ValueTag, IType>()
.ToBuilder();
foreach (var blockPair in blocks)
{
var newBlock = blockPair.Value.Map(mapping);
newBlockMap[blockPair.Key] = newBlock;
foreach (var newBlockParam in newBlock.Parameters)
{
newParamTypeMap[newBlockParam.Tag] = newBlockParam.Type;
}
}
var result = new FlowGraph(this, new MapMembersUpdate(mapping));
result.instructions = newInstructionMap.ToImmutable();
result.blocks = newBlockMap.ToImmutable();
result.blockParamTypes = newParamTypeMap.ToImmutable();
return(result);
}