X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Ftarget.h;h=e7150c205deb0d1b274b63da6a0194abd3161299;hb=3f0f721;hp=2c14ea1ae3064ef394e0bcff951dafddf8360b61;hpb=4f5571c3098953378253234b476a5a2b07974065;p=builder.git

diff --git a/source/target.h b/source/target.h
index 2c14ea1..e7150c2 100644
--- a/source/target.h
+++ b/source/target.h
@@ -5,105 +5,165 @@
 #include <map>
 #include <set>
 #include <string>
+#include <sigc++/signal.h>
 #include <msp/time/timestamp.h>
 
 class Builder;
-class Package;
+class BuildInfo;
+class Component;
+class SourcePackage;
 class Task;
 class Tool;
 
-class Target;
-
 /**
 Targets make up the build graph.  This class is a base for all target types and
 handles many common tasks.  See also FileTarget and VirtualTarget.
+
+Targets can depend on other targets.  There are two kinds of dependencies:
+normal and transitive.  Normal dependencies will need to be built before the
+target itself, and will cause the target to be rebuilt if modified.  Transitive
+dependencies can be used by other targets further down the chain.
 */
 class Target
 {
 public:
 	typedef std::list<Target *> Dependencies;
 
+protected:
+	enum State
+	{
+		INIT,
+		PREPARING,
+		REBUILD,
+		BUILDING,
+		UPTODATE,
+		BROKEN
+	};
+
+public:
+	sigc::signal<void> signal_bubble_rebuild;
+	sigc::signal<void> signal_modified;
+
 protected:
 	Builder &builder;
-	const Package *package;
+	const SourcePackage *package;
+	const Component *component;
 	std::string name;
 
-	const Tool *tool;
-	bool building;
-	bool rebuild;
+	Tool *tool;
+	State state;
 	std::string rebuild_reason;
-	std::string install_location;
+	std::list<std::string> problems;
 
 	Dependencies depends;
-	bool deps_ready;
-
-	bool preparing;
-	bool prepared;
+	Dependencies trans_depends;
+	Dependencies side_effects;
+	Target *primary_target;
 
-	Target(Builder &, const Package *, const std::string &);
+	Target(Builder &, const std::string &);
 public:
 	virtual ~Target() { }
 
 	virtual const char *get_type() const = 0;
 	const std::string &get_name() const { return name; }
-	const Package *get_package() const { return package; }
+	const SourcePackage *get_package() const { return package; }
+	const Component *get_component() const { return component; }
 
-	/**
-	Tries to locate a target that will help getting this target built.  If all
-	dependencies are up-to-date, returns this target.  If there are no targets
-	ready to be built (maybe because they are being built right now), returns 0.
-	*/
-	virtual Target *get_buildable_target();
+	/** Adds a dependency for the target.  Order is preseved and is important
+	for some target types.  It is an error to create dependency cycles, although
+	this won't be detected until the targets are prepared. */
+	void add_dependency(Target &);
+
+	void add_transitive_dependency(Target &);
+
+	/** Adds a side effect for the target.  Side effects are not built on their
+	own, but together with their primary target. */
+	void add_side_effect(Target &);
+
+protected:
+	/** Finds dependencies for the target.  Called during preparation.  If the
+	target needs to recursively inspect its dependencies, it should prepare its
+	direct dependencies first. */
+	virtual void find_dependencies() { }
+
+public:
+	/// Returns the dependencies of the target, in the order they were added.
+	const Dependencies &get_dependencies() const { return depends; }
+
+	const Dependencies &get_transitive_dependencies() const { return trans_depends; }
+
+	/// Returns the side effects of the target.
+	const Dependencies &get_side_effects() const { return side_effects; }
+
+	/// Returns the primary target associated with a side effect target.
+	Target *get_primary_target() const { return primary_target; }
 
-	/**
-	If this target is a proxy for another (such as Install or Symlink), return
-	that target.  Otherwise, return the target itself.
+	/** Tries to locate a target that will help getting this target built.  If
+	all dependencies are up-to-date, returns this target.  If there are no
+	targets ready to be built (maybe because they are being built right now),
+	returns 0. */
+	virtual Target *get_buildable_target();
 
-	Implementors should call the function recursively to find the final target.
-	*/
+	/** If this target is a proxy for another (such as InstalledFile), return
+	that target.  Otherwise, return the target itself.  Implementors should call
+	the function recursively to find the final target. */
 	virtual Target *get_real_target() { return this; }
 
-	void set_tool(const Tool &);
+	void set_tool(Tool &);
+
+	/** Returns the tool used to build the target.  To actually build it, call
+	the build() function. */
 	const Tool *get_tool() const { return tool; }
 
+	virtual void collect_build_info(BuildInfo &) const;
+
+	/** Indicates if it's possible to build this target. */
 	bool is_buildable() const { return tool!=0; }
-	bool needs_rebuild() const { return rebuild; }
+
+	/** Indicates if this target needs rebuilding.  Only makes sense after the
+	target has been prepared. */
+	bool needs_rebuild() const { return state>PREPARING && state<UPTODATE; }
+
+	/** Returns the reason for rebuilding this target.  Only makes sense after
+	the target has been prepared. */
 	const std::string &get_rebuild_reason() const { return rebuild_reason; }
-	bool is_installable() const { return !install_location.empty(); }
-	const std::string &get_install_location() const { return install_location; }
-	void add_depend(Target *);
-	const Dependencies &get_depends() const { return depends; }
-	bool get_depends_ready() const { return deps_ready; }
-
-	/**
-	Finds dependencies for the target.  When all dependencies have been found,
-	the function should set deps_ready to true.
-	*/
-	virtual void find_depends() { deps_ready = true; }
-
-	/**
-	Prepares the target by recursively preparing dependencies, then checking
-	whether rebuilding is needed.  A flag is used to prevent unnecessary
-	executions.
-	*/
-	virtual void prepare();
-
-	/**
-	Starts building the target.  Returns the Action used for building.
-	*/
-	Task *build();
+
+	/** Forces rebuild of the target. */
+	void force_rebuild();
+
 protected:
+	/** Marks the target to be rebuilt and specified a reason for it. */
 	void mark_rebuild(const std::string &);
 
-	/**
-	Checks if the target needs to be rebuilt and why.
-	*/
+	/** Checks if the target needs to be rebuilt and why. */
 	virtual void check_rebuild() = 0;
 
-	/**
-	Handler for the build_finished signal of Task.
-	*/
+public:
+	bool is_broken() const { return state==BROKEN; }
+
+	const std::list<std::string> &get_problems() const { return problems; }
+
+	/** Prepares the target by finding dependencies, recursively preparing them
+	and then checking whether rebuilding is needed. */
+	void prepare();
+
+	/** Invokes the associated Tool to build the target and returns the
+	resulting Task.  The task must be started by the caller. */
+	virtual Task *build();
+
+protected:
+	/** Targets can override this to do additional setup on the Task.  This is
+	also called on side effects, which normally do not get built by themselves. */
+	virtual void build(Task &) { }
+
+	/** Handler for Task::signal_finished. */
 	virtual void build_finished(bool);
+
+	virtual void modified() { }
+
+public:
+	/** Removes any results of building the target. */
+	virtual void clean() { }
 };
 
 #endif