You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
454 lines
14 KiB
454 lines
14 KiB
/*============================================================================
|
|
CMake - Cross Platform Makefile Generator
|
|
Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
|
|
|
|
Distributed under the OSI-approved BSD License (the "License");
|
|
see accompanying file Copyright.txt for details.
|
|
|
|
This software is distributed WITHOUT ANY WARRANTY; without even the
|
|
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
See the License for more information.
|
|
============================================================================*/
|
|
#include "cmComputeTargetDepends.h"
|
|
|
|
#include "cmComputeComponentGraph.h"
|
|
#include "cmGlobalGenerator.h"
|
|
#include "cmLocalGenerator.h"
|
|
#include "cmMakefile.h"
|
|
#include "cmSystemTools.h"
|
|
#include "cmTarget.h"
|
|
#include "cmake.h"
|
|
|
|
#include <algorithm>
|
|
|
|
#include <assert.h>
|
|
|
|
/*
|
|
|
|
This class is meant to analyze inter-target dependencies globally
|
|
during the generation step. The goal is to produce a set of direct
|
|
dependencies for each target such that no cycles are left and the
|
|
build order is safe.
|
|
|
|
For most target types cyclic dependencies are not allowed. However
|
|
STATIC libraries may depend on each other in a cyclic fasion. In
|
|
general the directed dependency graph forms a directed-acyclic-graph
|
|
of strongly connected components. All strongly connected components
|
|
should consist of only STATIC_LIBRARY targets.
|
|
|
|
In order to safely break dependency cycles we must preserve all other
|
|
dependencies passing through the corresponding strongly connected component.
|
|
The approach taken by this class is as follows:
|
|
|
|
- Collect all targets and form the original dependency graph
|
|
- Run Tarjan's algorithm to extract the strongly connected components
|
|
(error if any member of a non-trivial component is not STATIC)
|
|
- The original dependencies imply a DAG on the components.
|
|
Use the implied DAG to construct a final safe set of dependencies.
|
|
|
|
The final dependency set is constructed as follows:
|
|
|
|
- For each connected component targets are placed in an arbitrary
|
|
order. Each target depends on the target following it in the order.
|
|
The first target is designated the head and the last target the tail.
|
|
(most components will be just 1 target anyway)
|
|
|
|
- Original dependencies between targets in different components are
|
|
converted to connect the depender's component tail to the
|
|
dependee's component head.
|
|
|
|
In most cases this will reproduce the original dependencies. However
|
|
when there are cycles of static libraries they will be broken in a
|
|
safe manner.
|
|
|
|
For example, consider targets A0, A1, A2, B0, B1, B2, and C with these
|
|
dependencies:
|
|
|
|
A0 -> A1 -> A2 -> A0 , B0 -> B1 -> B2 -> B0 -> A0 , C -> B0
|
|
|
|
Components may be identified as
|
|
|
|
Component 0: A0, A1, A2
|
|
Component 1: B0, B1, B2
|
|
Component 2: C
|
|
|
|
Intra-component dependencies are:
|
|
|
|
0: A0 -> A1 -> A2 , head=A0, tail=A2
|
|
1: B0 -> B1 -> B2 , head=B0, tail=B2
|
|
2: head=C, tail=C
|
|
|
|
The inter-component dependencies are converted as:
|
|
|
|
B0 -> A0 is component 1->0 and becomes B2 -> A0
|
|
C -> B0 is component 2->1 and becomes C -> B0
|
|
|
|
This leads to the final target dependencies:
|
|
|
|
C -> B0 -> B1 -> B2 -> A0 -> A1 -> A2
|
|
|
|
These produce a safe build order since C depends directly or
|
|
transitively on all the static libraries it links.
|
|
|
|
*/
|
|
|
|
//----------------------------------------------------------------------------
|
|
cmComputeTargetDepends::cmComputeTargetDepends(cmGlobalGenerator* gg)
|
|
{
|
|
this->GlobalGenerator = gg;
|
|
cmake* cm = this->GlobalGenerator->GetCMakeInstance();
|
|
this->DebugMode = cm->GetPropertyAsBool("GLOBAL_DEPENDS_DEBUG_MODE");
|
|
this->NoCycles = cm->GetPropertyAsBool("GLOBAL_DEPENDS_NO_CYCLES");
|
|
}
|
|
|
|
//----------------------------------------------------------------------------
|
|
cmComputeTargetDepends::~cmComputeTargetDepends()
|
|
{
|
|
}
|
|
|
|
//----------------------------------------------------------------------------
|
|
bool cmComputeTargetDepends::Compute()
|
|
{
|
|
// Build the original graph.
|
|
this->CollectTargets();
|
|
this->CollectDepends();
|
|
if(this->DebugMode)
|
|
{
|
|
this->DisplayGraph(this->InitialGraph, "initial");
|
|
}
|
|
|
|
// Identify components.
|
|
cmComputeComponentGraph ccg(this->InitialGraph);
|
|
if(this->DebugMode)
|
|
{
|
|
this->DisplayComponents(ccg);
|
|
}
|
|
if(!this->CheckComponents(ccg))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
// Compute the final dependency graph.
|
|
this->ComputeFinalDepends(ccg);
|
|
if(this->DebugMode)
|
|
{
|
|
this->DisplayGraph(this->FinalGraph, "final");
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
//----------------------------------------------------------------------------
|
|
void
|
|
cmComputeTargetDepends::GetTargetDirectDepends(cmTarget* t,
|
|
std::set<cmTarget*>& deps)
|
|
{
|
|
// Lookup the index for this target. All targets should be known by
|
|
// this point.
|
|
std::map<cmTarget*, int>::const_iterator tii = this->TargetIndex.find(t);
|
|
assert(tii != this->TargetIndex.end());
|
|
int i = tii->second;
|
|
|
|
// Get its final dependencies.
|
|
NodeList const& nl = this->FinalGraph[i];
|
|
for(NodeList::const_iterator ni = nl.begin(); ni != nl.end(); ++ni)
|
|
{
|
|
deps.insert(this->Targets[*ni]);
|
|
}
|
|
}
|
|
|
|
//----------------------------------------------------------------------------
|
|
void cmComputeTargetDepends::CollectTargets()
|
|
{
|
|
// Collect all targets from all generators.
|
|
std::vector<cmLocalGenerator*> const& lgens =
|
|
this->GlobalGenerator->GetLocalGenerators();
|
|
for(unsigned int i = 0; i < lgens.size(); ++i)
|
|
{
|
|
cmTargets& targets = lgens[i]->GetMakefile()->GetTargets();
|
|
for(cmTargets::iterator ti = targets.begin(); ti != targets.end(); ++ti)
|
|
{
|
|
cmTarget* target = &ti->second;
|
|
int index = static_cast<int>(this->Targets.size());
|
|
this->TargetIndex[target] = index;
|
|
this->Targets.push_back(target);
|
|
}
|
|
}
|
|
}
|
|
|
|
//----------------------------------------------------------------------------
|
|
void cmComputeTargetDepends::CollectDepends()
|
|
{
|
|
// Allocate the dependency graph adjacency lists.
|
|
this->InitialGraph.resize(this->Targets.size());
|
|
|
|
// Compute each dependency list.
|
|
for(unsigned int i=0; i < this->Targets.size(); ++i)
|
|
{
|
|
this->CollectTargetDepends(i);
|
|
}
|
|
}
|
|
|
|
//----------------------------------------------------------------------------
|
|
void cmComputeTargetDepends::CollectTargetDepends(int depender_index)
|
|
{
|
|
// Get the depender.
|
|
cmTarget* depender = this->Targets[depender_index];
|
|
|
|
// Keep track of dependencies already listed.
|
|
std::set<cmStdString> emitted;
|
|
|
|
// A target should not depend on itself.
|
|
emitted.insert(depender->GetName());
|
|
|
|
// Loop over all targets linked directly.
|
|
cmTarget::LinkLibraryVectorType const& tlibs =
|
|
depender->GetOriginalLinkLibraries();
|
|
for(cmTarget::LinkLibraryVectorType::const_iterator lib = tlibs.begin();
|
|
lib != tlibs.end(); ++lib)
|
|
{
|
|
// Don't emit the same library twice for this target.
|
|
if(emitted.insert(lib->first).second)
|
|
{
|
|
this->AddTargetDepend(depender_index, lib->first.c_str(), true);
|
|
}
|
|
}
|
|
|
|
// Loop over all utility dependencies.
|
|
std::set<cmStdString> const& tutils = depender->GetUtilities();
|
|
for(std::set<cmStdString>::const_iterator util = tutils.begin();
|
|
util != tutils.end(); ++util)
|
|
{
|
|
// Don't emit the same utility twice for this target.
|
|
if(emitted.insert(*util).second)
|
|
{
|
|
this->AddTargetDepend(depender_index, util->c_str(), false);
|
|
}
|
|
}
|
|
}
|
|
|
|
//----------------------------------------------------------------------------
|
|
void cmComputeTargetDepends::AddTargetDepend(int depender_index,
|
|
const char* dependee_name,
|
|
bool linking)
|
|
{
|
|
// Get the depender.
|
|
cmTarget* depender = this->Targets[depender_index];
|
|
|
|
// Check the target's makefile first.
|
|
cmTarget* dependee =
|
|
depender->GetMakefile()->FindTarget(dependee_name);
|
|
|
|
// Then search globally.
|
|
if(!dependee)
|
|
{
|
|
dependee = this->GlobalGenerator->FindTarget(0, dependee_name);
|
|
}
|
|
|
|
// Skip targets that will not really be linked. This is probably a
|
|
// name conflict between an external library and an executable
|
|
// within the project.
|
|
if(linking && dependee &&
|
|
dependee->GetType() == cmTarget::EXECUTABLE &&
|
|
!dependee->IsExecutableWithExports())
|
|
{
|
|
dependee = 0;
|
|
}
|
|
|
|
// If not found then skip then the dependee.
|
|
if(!dependee)
|
|
{
|
|
return;
|
|
}
|
|
|
|
// No imported targets should have been found.
|
|
assert(!dependee->IsImported());
|
|
|
|
// Lookup the index for this target. All targets should be known by
|
|
// this point.
|
|
std::map<cmTarget*, int>::const_iterator tii =
|
|
this->TargetIndex.find(dependee);
|
|
assert(tii != this->TargetIndex.end());
|
|
int dependee_index = tii->second;
|
|
|
|
// Add this entry to the dependency graph.
|
|
this->InitialGraph[depender_index].push_back(dependee_index);
|
|
}
|
|
|
|
//----------------------------------------------------------------------------
|
|
void
|
|
cmComputeTargetDepends::DisplayGraph(Graph const& graph, const char* name)
|
|
{
|
|
fprintf(stderr, "The %s target dependency graph is:\n", name);
|
|
int n = static_cast<int>(graph.size());
|
|
for(int depender_index = 0; depender_index < n; ++depender_index)
|
|
{
|
|
NodeList const& nl = graph[depender_index];
|
|
cmTarget* depender = this->Targets[depender_index];
|
|
fprintf(stderr, "target %d is [%s]\n",
|
|
depender_index, depender->GetName());
|
|
for(NodeList::const_iterator ni = nl.begin(); ni != nl.end(); ++ni)
|
|
{
|
|
int dependee_index = *ni;
|
|
cmTarget* dependee = this->Targets[dependee_index];
|
|
fprintf(stderr, " depends on target %d [%s]\n", dependee_index,
|
|
dependee->GetName());
|
|
}
|
|
}
|
|
fprintf(stderr, "\n");
|
|
}
|
|
|
|
//----------------------------------------------------------------------------
|
|
void
|
|
cmComputeTargetDepends
|
|
::DisplayComponents(cmComputeComponentGraph const& ccg)
|
|
{
|
|
fprintf(stderr, "The strongly connected components are:\n");
|
|
std::vector<NodeList> const& components = ccg.GetComponents();
|
|
int n = static_cast<int>(components.size());
|
|
for(int c = 0; c < n; ++c)
|
|
{
|
|
NodeList const& nl = components[c];
|
|
fprintf(stderr, "Component (%d):\n", c);
|
|
for(NodeList::const_iterator ni = nl.begin(); ni != nl.end(); ++ni)
|
|
{
|
|
int i = *ni;
|
|
fprintf(stderr, " contains target %d [%s]\n",
|
|
i, this->Targets[i]->GetName());
|
|
}
|
|
}
|
|
fprintf(stderr, "\n");
|
|
}
|
|
|
|
//----------------------------------------------------------------------------
|
|
bool
|
|
cmComputeTargetDepends
|
|
::CheckComponents(cmComputeComponentGraph const& ccg)
|
|
{
|
|
// All non-trivial components should consist only of static
|
|
// libraries.
|
|
std::vector<NodeList> const& components = ccg.GetComponents();
|
|
int nc = static_cast<int>(components.size());
|
|
for(int c=0; c < nc; ++c)
|
|
{
|
|
// Get the current component.
|
|
NodeList const& nl = components[c];
|
|
|
|
// Skip trivial components.
|
|
if(nl.size() < 2)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
// Immediately complain if no cycles are allowed at all.
|
|
if(this->NoCycles)
|
|
{
|
|
this->ComplainAboutBadComponent(ccg, c);
|
|
return false;
|
|
}
|
|
|
|
// Make sure the component is all STATIC_LIBRARY targets.
|
|
for(NodeList::const_iterator ni = nl.begin(); ni != nl.end(); ++ni)
|
|
{
|
|
if(this->Targets[*ni]->GetType() != cmTarget::STATIC_LIBRARY)
|
|
{
|
|
this->ComplainAboutBadComponent(ccg, c);
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
//----------------------------------------------------------------------------
|
|
void
|
|
cmComputeTargetDepends
|
|
::ComplainAboutBadComponent(cmComputeComponentGraph const& ccg, int c)
|
|
{
|
|
// Construct the error message.
|
|
cmOStringStream e;
|
|
e << "The inter-target dependency graph contains the following "
|
|
<< "strongly connected component (cycle):\n";
|
|
std::vector<NodeList> const& components = ccg.GetComponents();
|
|
std::vector<int> const& cmap = ccg.GetComponentMap();
|
|
NodeList const& cl = components[c];
|
|
for(NodeList::const_iterator ci = cl.begin(); ci != cl.end(); ++ci)
|
|
{
|
|
// Get the depender.
|
|
int i = *ci;
|
|
cmTarget* depender = this->Targets[i];
|
|
|
|
// Describe the depender.
|
|
e << " \"" << depender->GetName() << "\" of type "
|
|
<< cmTarget::TargetTypeNames[depender->GetType()] << "\n";
|
|
|
|
// List its dependencies that are inside the component.
|
|
NodeList const& nl = this->InitialGraph[i];
|
|
for(NodeList::const_iterator ni = nl.begin(); ni != nl.end(); ++ni)
|
|
{
|
|
int j = *ni;
|
|
if(cmap[j] == c)
|
|
{
|
|
cmTarget* dependee = this->Targets[j];
|
|
e << " depends on \"" << dependee->GetName() << "\"\n";
|
|
}
|
|
}
|
|
}
|
|
if(this->NoCycles)
|
|
{
|
|
e << "The GLOBAL_DEPENDS_NO_CYCLES global property is enabled, so "
|
|
<< "cyclic dependencies are not allowed even among static libraries.";
|
|
}
|
|
else
|
|
{
|
|
e << "At least one of these targets is not a STATIC_LIBRARY. "
|
|
<< "Cyclic dependencies are allowed only among static libraries.";
|
|
}
|
|
cmSystemTools::Error(e.str().c_str());
|
|
}
|
|
|
|
//----------------------------------------------------------------------------
|
|
void
|
|
cmComputeTargetDepends
|
|
::ComputeFinalDepends(cmComputeComponentGraph const& ccg)
|
|
{
|
|
// Get the component graph information.
|
|
std::vector<NodeList> const& components = ccg.GetComponents();
|
|
Graph const& cgraph = ccg.GetComponentGraph();
|
|
|
|
// Allocate the final graph.
|
|
this->FinalGraph.resize(0);
|
|
this->FinalGraph.resize(this->InitialGraph.size());
|
|
|
|
// Convert inter-component edges to connect component tails to heads.
|
|
int n = static_cast<int>(cgraph.size());
|
|
for(int depender_component=0; depender_component < n; ++depender_component)
|
|
{
|
|
int depender_component_tail = components[depender_component].back();
|
|
NodeList const& nl = cgraph[depender_component];
|
|
for(NodeList::const_iterator ni = nl.begin(); ni != nl.end(); ++ni)
|
|
{
|
|
int dependee_component = *ni;
|
|
int dependee_component_head = components[dependee_component].front();
|
|
this->FinalGraph[depender_component_tail]
|
|
.push_back(dependee_component_head);
|
|
}
|
|
}
|
|
|
|
// Compute intra-component edges.
|
|
int nc = static_cast<int>(components.size());
|
|
for(int c=0; c < nc; ++c)
|
|
{
|
|
// Within the component each target depends on that following it.
|
|
NodeList const& nl = components[c];
|
|
NodeList::const_iterator ni = nl.begin();
|
|
int last_i = *ni;
|
|
for(++ni; ni != nl.end(); ++ni)
|
|
{
|
|
int i = *ni;
|
|
this->FinalGraph[last_i].push_back(i);
|
|
last_i = i;
|
|
}
|
|
}
|
|
}
|