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// file : build/test/rule.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <build/test/rule>
#include <butl/process>
#include <butl/fdstream>
#include <build/scope>
#include <build/target>
#include <build/algorithm>
#include <build/diagnostics>
using namespace std;
using namespace butl;
namespace build
{
namespace test
{
match_result rule::
match (action a, target& t, const std::string&) const
{
// First determine if this is a test. This is controlled by
// the test target variable and text.<tt> scope variables.
// Also, it feels redundant to specify, say, "test = true"
// and "test.output = test.out" -- the latter already says
// this is a test. So take care of that as well.
//
bool r (false);
value_proxy v;
for (auto p (t.vars.find_namespace ("test"));
p.first != p.second;
++p.first)
{
const variable& var (p.first->first);
value_ptr& val (p.first->second);
// If we have test, then always use that.
//
if (var.name == "test")
{
v.rebind (value_proxy (val, t));
break;
}
// Otherwise check for variables that would indicate this
// is a test.
//
if (var.name == "test.input" ||
var.name == "test.ouput" ||
var.name == "test.roundtrip" ||
var.name == "test.options" ||
var.name == "test.arguments")
{
r = true;
break;
}
}
if (!r)
{
// See if the is a scope variable.
//
if (!v)
v.rebind (t.base_scope ()[string("test.") + t.type ().name]);
r = v && v.as<bool> ();
}
if (!r)
return match_result (t, false); // "Not a test" result.
// If this is the update pre-operation, make someone else do
// the job.
//
if (a.operation () != test_id)
return nullptr;
return match_result (t, true);
}
recipe rule::
apply (action a, target& t, const match_result& mr) const
{
tracer trace ("test::rule::apply");
if (!mr.value) // Not a test.
return noop_recipe;
// Don't do anything for other meta-operations.
//
if (a != action (perform_id, test_id))
return noop_recipe;
// See if we have test.{input,output,roundtrip}. First check the
// target-specific vars since they override any scope ones.
//
auto iv (t.vars["test.input"]);
auto ov (t.vars["test.output"]);
auto rv (t.vars["test.roundtrip"]);
// Can either be input or arguments.
//
auto av (t.vars["test.arguments"]);
if (av)
{
if (iv)
fail << "both test.input and test.arguments specified for "
<< "target " << t;
if (rv)
fail << "both test.roundtrip and test.arguments specified for "
<< "target " << t;
}
scope& bs (t.base_scope ());
if (!iv && !ov && !rv)
{
string n ("test.");
n += t.type ().name;
const variable& in (variable_pool.find (n + ".input"));
const variable& on (variable_pool.find (n + ".output"));
const variable& rn (variable_pool.find (n + ".roundtrip"));
// We should only keep value(s) that were specified together
// in the innermost scope.
//
for (scope* s (&bs); s != nullptr; s = s->parent_scope ())
{
ov.rebind (s->vars[on]);
if (!av) // Not overriden at target level by test.arguments?
{
iv.rebind (s->vars[in]);
rv.rebind (s->vars[rn]);
}
if (iv || ov || rv)
break;
}
}
const name* i;
const name* o;
// Reduce the roundtrip case to input/output.
//
if (rv)
{
if (iv || ov)
fail << "both test.roundtrip and test.input/output specified "
<< "for target " << t;
i = o = rv.as<const name*> ();
}
else
{
i = iv ? iv.as<const name*> () : nullptr;
o = ov ? ov.as<const name*> () : nullptr;
}
// Resolve them to targets (normally just files) and cache in
// our prerequsite targets lists where they can be found by
// perform_test(). If we have either or both, then the first
// entry is input and the second -- output (either can be NULL).
//
auto& pts (t.prerequisite_targets);
if (i != nullptr || o != nullptr)
pts.resize (2, nullptr);
//@@ We should match() them, but for update, not test.
//@@ If not doing this for some reason, need to then verify
// path was assigned (i.e., matched an existing file).
//
if (i != nullptr)
pts[0] = &search (*i, bs);
if (o != nullptr)
pts[1] = i == o ? pts[0] : &search (*o, bs);
return &perform_test;
}
static void
add_arguments (cstrings& args, target& t, const char* n)
{
string var ("test.");
var += n;
auto v (t.vars[var]);
if (!v)
{
var.resize (5);
var += t.type ().name;
var += '.';
var += n;
v.rebind (t.base_scope ()[var]);
}
if (v)
{
for (const name& n: v.as<const list_value&> ())
{
if (n.simple ())
args.push_back (n.value.c_str ());
else if (n.directory ())
args.push_back (n.dir.string ().c_str ());
else
fail << "expected argument instead of " << n <<
info << "in variable " << var;
}
}
}
// The format of args shall be:
//
// name1 arg arg ... nullptr
// name2 arg arg ... nullptr
// ...
// nameN arg arg ... nullptr nullptr
//
static bool
run_test (target& t,
diag_record& dr,
char const** args,
process* prev = nullptr)
{
// Find the next process, if any.
//
char const** next (args);
for (next++; *next != nullptr; next++) ;
next++;
// Redirect stdout to a pipe unless we are last, in which
// case redirect it to stderr.
//
int out (*next == nullptr ? 2 : -1);
bool pr, wr;
try
{
if (prev == nullptr)
{
// First process.
//
process p (args, 0, out);
pr = *next == nullptr || run_test (t, dr, next, &p);
wr = p.wait ();
}
else
{
// Next process.
//
process p (args, *prev, out);
pr = *next == nullptr || run_test (t, dr, next, &p);
wr = p.wait ();
}
}
catch (const process_error& e)
{
error << "unable to execute " << args[0] << ": " << e.what ();
if (e.child ())
exit (1);
throw failed ();
}
if (!wr)
{
if (pr) // First failure?
dr << fail << "test " << t << " failed"; // Multi test: test 1.
dr << error << "non-zero exit status: ";
print_process (dr, args);
}
return pr && wr;
}
target_state rule::
perform_test (action, target& t)
{
// @@ Would be nice to print what signal/core was dumped.
//
// @@ Doesn't have to be a file target if we have test.cmd.
//
file& ft (static_cast<file&> (t));
assert (!ft.path ().empty ()); // Should have been assigned by update.
cstrings args {ft.path ().string ().c_str ()};
// Do we have options?
//
add_arguments (args, t, "options");
// Do we have input?
//
auto& pts (t.prerequisite_targets);
if (pts.size () != 0 && pts[0] != nullptr)
{
file& it (static_cast<file&> (*pts[0]));
assert (!it.path ().empty ()); // Should have been assigned.
args.push_back (it.path ().string ().c_str ());
}
// Maybe arguments then?
//
else
add_arguments (args, t, "arguments");
args.push_back (nullptr);
// Do we have output?
//
if (pts.size () != 0 && pts[1] != nullptr)
{
file& ot (static_cast<file&> (*pts[1]));
assert (!ot.path ().empty ()); // Should have been assigned.
args.push_back ("diff");
args.push_back ("-u");
args.push_back (ot.path ().string ().c_str ());
args.push_back ("-");
args.push_back (nullptr);
}
args.push_back (nullptr); // Second.
if (verb)
print_process (args);
else
text << "test " << t;
{
diag_record dr;
if (!run_test (t, dr, args.data ()))
{
dr << info << "test command line: ";
print_process (dr, args);
}
}
return target_state::changed;
}
}
}
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