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Add test for jumpdest removal.

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chriseth 2017-08-15 16:05:09 +02:00 committed by Alex Beregszaszi
parent d15526f877
commit 223235c97e
1 changed files with 84 additions and 0 deletions
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84
test/libevmasm/Optimiser.cpp
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@ -22,6 +22,7 @@
#include <libevmasm/CommonSubexpressionEliminator.h>
#include <libevmasm/PeepholeOptimiser.h>
#include <libevmasm/JumpdestRemover.h>
#include <libevmasm/ControlFlowGraph.h>
#include <libevmasm/BlockDeduplicator.h>
#include <libevmasm/Assembly.h>
@ -840,6 +841,89 @@ BOOST_AUTO_TEST_CASE(peephole_double_push)
);
}
BOOST_AUTO_TEST_CASE(jumpdest_removal)
{
AssemblyItems items{
AssemblyItem(Tag, 2),
AssemblyItem(PushTag, 1),
u256(5),
AssemblyItem(Tag, 10),
AssemblyItem(Tag, 3),
u256(6),
AssemblyItem(Tag, 1),
Instruction::JUMP,
};
AssemblyItems expectation{
AssemblyItem(PushTag, 1),
u256(5),
u256(6),
AssemblyItem(Tag, 1),
Instruction::JUMP
};
JumpdestRemover jdr(items);
BOOST_REQUIRE(jdr.optimise({}));
BOOST_CHECK_EQUAL_COLLECTIONS(
items.begin(), items.end(),
expectation.begin(), expectation.end()
);
}
BOOST_AUTO_TEST_CASE(jumpdest_removal_subassemblies)
{
// This tests that tags from subassemblies are not removed
// if they are referenced by a super-assembly. Furthermore,
// tag unifications (due to block deduplication) is also
// visible at the super-assembly.
Assembly main;
AssemblyPointer sub = make_shared<Assembly>();
sub->append(u256(1));
auto t1 = sub->newTag();
sub->append(t1);
sub->append(u256(2));
sub->append(Instruction::JUMP);
auto t2 = sub->newTag();
sub->append(t2); // Identical to T1, will be unified
sub->append(u256(2));
sub->append(Instruction::JUMP);
auto t3 = sub->newTag();
sub->append(t3);
auto t4 = sub->newTag();
sub->append(t4);
auto t5 = sub->newTag();
sub->append(t5); // This will be removed
sub->append(u256(7));
sub->append(t4.pushTag());
sub->append(Instruction::JUMP);
size_t subId = size_t(main.appendSubroutine(sub).data());
main.append(t1.toSubAssemblyTag(subId));
main.append(t1.toSubAssemblyTag(subId));
main.append(u256(8));
main.optimise(true);
AssemblyItems expectationMain{
AssemblyItem(PushSubSize, 0),
t1.toSubAssemblyTag(subId).pushTag(),
t1.toSubAssemblyTag(subId).pushTag(),
u256(8)
};
BOOST_CHECK_EQUAL_COLLECTIONS(
main.items().begin(), main.items().end(),
expectationMain.begin(), expectationMain.end()
);
AssemblyItems expectationSub{
u256(1), t1.tag(), u256(2), Instruction::JUMP, t4.tag(), u256(7), t4.pushTag(), Instruction::JUMP
};
BOOST_CHECK_EQUAL_COLLECTIONS(
sub->items().begin(), sub->items().end(),
expectationSub.begin(), expectationSub.end()
);
}
BOOST_AUTO_TEST_CASE(cse_sub_zero)
{
checkCSE({