llvm-6502/lib/CompilerDriver/CompilationGraph.cpp
2009-08-23 07:19:13 +00:00

534 lines
16 KiB
C++

//===--- CompilationGraph.cpp - The LLVM Compiler Driver --------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open
// Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Compilation graph - implementation.
//
//===----------------------------------------------------------------------===//
#include "llvm/CompilerDriver/BuiltinOptions.h"
#include "llvm/CompilerDriver/CompilationGraph.h"
#include "llvm/CompilerDriver/Error.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/DOTGraphTraits.h"
#include "llvm/Support/GraphWriter.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cstring>
#include <iterator>
#include <limits>
#include <queue>
#include <stdexcept>
using namespace llvm;
using namespace llvmc;
namespace llvmc {
const std::string& LanguageMap::GetLanguage(const sys::Path& File) const {
LanguageMap::const_iterator Lang = this->find(File.getSuffix());
if (Lang == this->end())
throw std::runtime_error("Unknown suffix: " + File.getSuffix());
return Lang->second;
}
}
namespace {
/// ChooseEdge - Return the edge with the maximum weight.
template <class C>
const Edge* ChooseEdge(const C& EdgesContainer,
const InputLanguagesSet& InLangs,
const std::string& NodeName = "root") {
const Edge* MaxEdge = 0;
unsigned MaxWeight = 0;
bool SingleMax = true;
for (typename C::const_iterator B = EdgesContainer.begin(),
E = EdgesContainer.end(); B != E; ++B) {
const Edge* e = B->getPtr();
unsigned EW = e->Weight(InLangs);
if (EW > MaxWeight) {
MaxEdge = e;
MaxWeight = EW;
SingleMax = true;
} else if (EW == MaxWeight) {
SingleMax = false;
}
}
if (!SingleMax)
throw std::runtime_error("Node " + NodeName +
": multiple maximal outward edges found!"
" Most probably a specification error.");
if (!MaxEdge)
throw std::runtime_error("Node " + NodeName +
": no maximal outward edge found!"
" Most probably a specification error.");
return MaxEdge;
}
}
void Node::AddEdge(Edge* Edg) {
// If there already was an edge between two nodes, modify it instead
// of adding a new edge.
const std::string& ToolName = Edg->ToolName();
for (container_type::iterator B = OutEdges.begin(), E = OutEdges.end();
B != E; ++B) {
if ((*B)->ToolName() == ToolName) {
llvm::IntrusiveRefCntPtr<Edge>(Edg).swap(*B);
return;
}
}
OutEdges.push_back(llvm::IntrusiveRefCntPtr<Edge>(Edg));
}
CompilationGraph::CompilationGraph() {
NodesMap["root"] = Node(this);
}
Node& CompilationGraph::getNode(const std::string& ToolName) {
nodes_map_type::iterator I = NodesMap.find(ToolName);
if (I == NodesMap.end())
throw std::runtime_error("Node " + ToolName + " is not in the graph");
return I->second;
}
const Node& CompilationGraph::getNode(const std::string& ToolName) const {
nodes_map_type::const_iterator I = NodesMap.find(ToolName);
if (I == NodesMap.end())
throw std::runtime_error("Node " + ToolName + " is not in the graph!");
return I->second;
}
// Find the tools list corresponding to the given language name.
const CompilationGraph::tools_vector_type&
CompilationGraph::getToolsVector(const std::string& LangName) const
{
tools_map_type::const_iterator I = ToolsMap.find(LangName);
if (I == ToolsMap.end())
throw std::runtime_error("No tool corresponding to the language "
+ LangName + " found");
return I->second;
}
void CompilationGraph::insertNode(Tool* V) {
if (NodesMap.count(V->Name()) == 0)
NodesMap[V->Name()] = Node(this, V);
}
void CompilationGraph::insertEdge(const std::string& A, Edge* Edg) {
Node& B = getNode(Edg->ToolName());
if (A == "root") {
const char** InLangs = B.ToolPtr->InputLanguages();
for (;*InLangs; ++InLangs)
ToolsMap[*InLangs].push_back(IntrusiveRefCntPtr<Edge>(Edg));
NodesMap["root"].AddEdge(Edg);
}
else {
Node& N = getNode(A);
N.AddEdge(Edg);
}
// Increase the inward edge counter.
B.IncrInEdges();
}
// Pass input file through the chain until we bump into a Join node or
// a node that says that it is the last.
void CompilationGraph::PassThroughGraph (const sys::Path& InFile,
const Node* StartNode,
const InputLanguagesSet& InLangs,
const sys::Path& TempDir,
const LanguageMap& LangMap) const {
sys::Path In = InFile;
const Node* CurNode = StartNode;
while(true) {
Tool* CurTool = CurNode->ToolPtr.getPtr();
if (CurTool->IsJoin()) {
JoinTool& JT = dynamic_cast<JoinTool&>(*CurTool);
JT.AddToJoinList(In);
break;
}
Action CurAction = CurTool->GenerateAction(In, CurNode->HasChildren(),
TempDir, InLangs, LangMap);
if (int ret = CurAction.Execute())
throw error_code(ret);
if (CurAction.StopCompilation())
return;
CurNode = &getNode(ChooseEdge(CurNode->OutEdges,
InLangs,
CurNode->Name())->ToolName());
In = CurAction.OutFile();
}
}
// Find the head of the toolchain corresponding to the given file.
// Also, insert an input language into InLangs.
const Node* CompilationGraph::
FindToolChain(const sys::Path& In, const std::string* ForceLanguage,
InputLanguagesSet& InLangs, const LanguageMap& LangMap) const {
// Determine the input language.
const std::string& InLanguage =
ForceLanguage ? *ForceLanguage : LangMap.GetLanguage(In);
// Add the current input language to the input language set.
InLangs.insert(InLanguage);
// Find the toolchain for the input language.
const tools_vector_type& TV = getToolsVector(InLanguage);
if (TV.empty())
throw std::runtime_error("No toolchain corresponding to language "
+ InLanguage + " found");
return &getNode(ChooseEdge(TV, InLangs)->ToolName());
}
// Helper function used by Build().
// Traverses initial portions of the toolchains (up to the first Join node).
// This function is also responsible for handling the -x option.
void CompilationGraph::BuildInitial (InputLanguagesSet& InLangs,
const sys::Path& TempDir,
const LanguageMap& LangMap) {
// This is related to -x option handling.
cl::list<std::string>::const_iterator xIter = Languages.begin(),
xBegin = xIter, xEnd = Languages.end();
bool xEmpty = true;
const std::string* xLanguage = 0;
unsigned xPos = 0, xPosNext = 0, filePos = 0;
if (xIter != xEnd) {
xEmpty = false;
xPos = Languages.getPosition(xIter - xBegin);
cl::list<std::string>::const_iterator xNext = llvm::next(xIter);
xPosNext = (xNext == xEnd) ? std::numeric_limits<unsigned>::max()
: Languages.getPosition(xNext - xBegin);
xLanguage = (*xIter == "none") ? 0 : &(*xIter);
}
// For each input file:
for (cl::list<std::string>::const_iterator B = InputFilenames.begin(),
CB = B, E = InputFilenames.end(); B != E; ++B) {
sys::Path In = sys::Path(*B);
// Code for handling the -x option.
// Output: std::string* xLanguage (can be NULL).
if (!xEmpty) {
filePos = InputFilenames.getPosition(B - CB);
if (xPos < filePos) {
if (filePos < xPosNext) {
xLanguage = (*xIter == "none") ? 0 : &(*xIter);
}
else { // filePos >= xPosNext
// Skip xIters while filePos > xPosNext
while (filePos > xPosNext) {
++xIter;
xPos = xPosNext;
cl::list<std::string>::const_iterator xNext = llvm::next(xIter);
if (xNext == xEnd)
xPosNext = std::numeric_limits<unsigned>::max();
else
xPosNext = Languages.getPosition(xNext - xBegin);
xLanguage = (*xIter == "none") ? 0 : &(*xIter);
}
}
}
}
// Find the toolchain corresponding to this file.
const Node* N = FindToolChain(In, xLanguage, InLangs, LangMap);
// Pass file through the chain starting at head.
PassThroughGraph(In, N, InLangs, TempDir, LangMap);
}
}
// Sort the nodes in topological order.
void CompilationGraph::TopologicalSort(std::vector<const Node*>& Out) {
std::queue<const Node*> Q;
Q.push(&getNode("root"));
while (!Q.empty()) {
const Node* A = Q.front();
Q.pop();
Out.push_back(A);
for (Node::const_iterator EB = A->EdgesBegin(), EE = A->EdgesEnd();
EB != EE; ++EB) {
Node* B = &getNode((*EB)->ToolName());
B->DecrInEdges();
if (B->HasNoInEdges())
Q.push(B);
}
}
}
namespace {
bool NotJoinNode(const Node* N) {
return N->ToolPtr ? !N->ToolPtr->IsJoin() : true;
}
}
// Call TopologicalSort and filter the resulting list to include
// only Join nodes.
void CompilationGraph::
TopologicalSortFilterJoinNodes(std::vector<const Node*>& Out) {
std::vector<const Node*> TopSorted;
TopologicalSort(TopSorted);
std::remove_copy_if(TopSorted.begin(), TopSorted.end(),
std::back_inserter(Out), NotJoinNode);
}
int CompilationGraph::Build (const sys::Path& TempDir,
const LanguageMap& LangMap) {
InputLanguagesSet InLangs;
// Traverse initial parts of the toolchains and fill in InLangs.
BuildInitial(InLangs, TempDir, LangMap);
std::vector<const Node*> JTV;
TopologicalSortFilterJoinNodes(JTV);
// For all join nodes in topological order:
for (std::vector<const Node*>::iterator B = JTV.begin(), E = JTV.end();
B != E; ++B) {
const Node* CurNode = *B;
JoinTool* JT = &dynamic_cast<JoinTool&>(*CurNode->ToolPtr.getPtr());
// Are there any files in the join list?
if (JT->JoinListEmpty())
continue;
Action CurAction = JT->GenerateAction(CurNode->HasChildren(),
TempDir, InLangs, LangMap);
if (int ret = CurAction.Execute())
throw error_code(ret);
if (CurAction.StopCompilation())
return 0;
const Node* NextNode = &getNode(ChooseEdge(CurNode->OutEdges, InLangs,
CurNode->Name())->ToolName());
PassThroughGraph(sys::Path(CurAction.OutFile()), NextNode,
InLangs, TempDir, LangMap);
}
return 0;
}
int CompilationGraph::CheckLanguageNames() const {
int ret = 0;
// Check that names for output and input languages on all edges do match.
for (const_nodes_iterator B = this->NodesMap.begin(),
E = this->NodesMap.end(); B != E; ++B) {
const Node & N1 = B->second;
if (N1.ToolPtr) {
for (Node::const_iterator EB = N1.EdgesBegin(), EE = N1.EdgesEnd();
EB != EE; ++EB) {
const Node& N2 = this->getNode((*EB)->ToolName());
if (!N2.ToolPtr) {
++ret;
errs() << "Error: there is an edge from '" << N1.ToolPtr->Name()
<< "' back to the root!\n\n";
continue;
}
const char* OutLang = N1.ToolPtr->OutputLanguage();
const char** InLangs = N2.ToolPtr->InputLanguages();
bool eq = false;
for (;*InLangs; ++InLangs) {
if (std::strcmp(OutLang, *InLangs) == 0) {
eq = true;
break;
}
}
if (!eq) {
++ret;
errs() << "Error: Output->input language mismatch in the edge '"
<< N1.ToolPtr->Name() << "' -> '" << N2.ToolPtr->Name()
<< "'!\n"
<< "Expected one of { ";
InLangs = N2.ToolPtr->InputLanguages();
for (;*InLangs; ++InLangs) {
errs() << '\'' << *InLangs << (*(InLangs+1) ? "', " : "'");
}
errs() << " }, but got '" << OutLang << "'!\n\n";
}
}
}
}
return ret;
}
int CompilationGraph::CheckMultipleDefaultEdges() const {
int ret = 0;
InputLanguagesSet Dummy;
// For all nodes, just iterate over the outgoing edges and check if there is
// more than one edge with maximum weight.
for (const_nodes_iterator B = this->NodesMap.begin(),
E = this->NodesMap.end(); B != E; ++B) {
const Node& N = B->second;
unsigned MaxWeight = 0;
// Ignore the root node.
if (!N.ToolPtr)
continue;
for (Node::const_iterator EB = N.EdgesBegin(), EE = N.EdgesEnd();
EB != EE; ++EB) {
unsigned EdgeWeight = (*EB)->Weight(Dummy);
if (EdgeWeight > MaxWeight) {
MaxWeight = EdgeWeight;
}
else if (EdgeWeight == MaxWeight) {
++ret;
errs() << "Error: there are multiple maximal edges stemming from the '"
<< N.ToolPtr->Name() << "' node!\n\n";
break;
}
}
}
return ret;
}
int CompilationGraph::CheckCycles() {
unsigned deleted = 0;
std::queue<Node*> Q;
Q.push(&getNode("root"));
// Try to delete all nodes that have no ingoing edges, starting from the
// root. If there are any nodes left after this operation, then we have a
// cycle. This relies on '--check-graph' not performing the topological sort.
while (!Q.empty()) {
Node* A = Q.front();
Q.pop();
++deleted;
for (Node::iterator EB = A->EdgesBegin(), EE = A->EdgesEnd();
EB != EE; ++EB) {
Node* B = &getNode((*EB)->ToolName());
B->DecrInEdges();
if (B->HasNoInEdges())
Q.push(B);
}
}
if (deleted != NodesMap.size()) {
errs() << "Error: there are cycles in the compilation graph!\n"
<< "Try inspecting the diagram produced by "
<< "'llvmc --view-graph'.\n\n";
return 1;
}
return 0;
}
int CompilationGraph::Check () {
// We try to catch as many errors as we can in one go.
int ret = 0;
// Check that output/input language names match.
ret += this->CheckLanguageNames();
// Check for multiple default edges.
ret += this->CheckMultipleDefaultEdges();
// Check for cycles.
ret += this->CheckCycles();
return ret;
}
// Code related to graph visualization.
namespace llvm {
template <>
struct DOTGraphTraits<llvmc::CompilationGraph*>
: public DefaultDOTGraphTraits
{
template<typename GraphType>
static std::string getNodeLabel(const Node* N, const GraphType&,
bool ShortNames)
{
if (N->ToolPtr)
if (N->ToolPtr->IsJoin())
return N->Name() + "\n (join" +
(N->HasChildren() ? ")"
: std::string(": ") + N->ToolPtr->OutputLanguage() + ')');
else
return N->Name();
else
return "root";
}
template<typename EdgeIter>
static std::string getEdgeSourceLabel(const Node* N, EdgeIter I) {
if (N->ToolPtr) {
return N->ToolPtr->OutputLanguage();
}
else {
const char** InLangs = I->ToolPtr->InputLanguages();
std::string ret;
for (; *InLangs; ++InLangs) {
if (*(InLangs + 1)) {
ret += *InLangs;
ret += ", ";
}
else {
ret += *InLangs;
}
}
return ret;
}
}
};
}
void CompilationGraph::writeGraph(const std::string& OutputFilename) {
std::string ErrorInfo;
raw_fd_ostream O(OutputFilename.c_str(), ErrorInfo);
if (ErrorInfo.empty()) {
errs() << "Writing '"<< OutputFilename << "' file...";
llvm::WriteGraph(O, this);
errs() << "done.\n";
}
else {
throw std::runtime_error("Error opening file '" + OutputFilename
+ "' for writing!");
}
}
void CompilationGraph::viewGraph() {
llvm::ViewGraph(this, "compilation-graph");
}