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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| Copyright 2024 Intel Corp. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| #include "frontends/common/parseInput.h" | ||
| #include "frontends/common/resolveReferences/resolveReferences.h" | ||
| #include "gtest/gtest.h" | ||
| #include "helpers.h" | ||
| #include "ir/ir.h" | ||
| #include "midend_pass.h" | ||
|
|
||
| namespace Test { | ||
|
|
||
| using P4TestContext = P4CContextWithOptions<CompilerOptions>; | ||
|
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| class P4CVisitor : public P4CTest {}; | ||
|
|
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| struct MultiVisitInspector : public Inspector, virtual public P4::ResolutionContext { | ||
| MultiVisitInspector() { visitDagOnce = false; } | ||
|
|
||
| private: | ||
| // ignore parser and declaration loops for now | ||
| void loop_revisit(const IR::ParserState *) override {} | ||
|
|
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| void visit_def(const IR::PathExpression *pe) { | ||
| auto *d = resolveUnique(pe->path->name, P4::ResolutionType::Any); | ||
| BUG_CHECK(d, "failed to resolve %s", pe); | ||
| if (auto *ps = d->to<IR::ParserState>()) { | ||
| visit(ps, "transition"); | ||
| } else if (auto *act = d->to<IR::P4Action>()) { | ||
| visit(act, "actions"); | ||
| } else { | ||
| auto *obj = d->getNode(); // FIXME -- should be able to visit an INode | ||
| visit(obj); | ||
| } | ||
| } | ||
|
|
||
| bool preorder(const IR::PathExpression *path) override { | ||
| visit_def(path); | ||
| return true; | ||
| } | ||
|
|
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| MultiVisitInspector(const MultiVisitInspector &) = default; | ||
| }; | ||
|
|
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| struct MultiVisitModifier : public Modifier, | ||
| // protected ControlFlowVisitor, | ||
| virtual public P4::ResolutionContext { | ||
| MultiVisitModifier() { visitDagOnce = false; } | ||
|
|
||
| private: | ||
| // ignore parser and declaration loops for now | ||
| void loop_revisit(const IR::ParserState *) override {} | ||
|
|
||
| void visit_def(const IR::PathExpression *pe) { | ||
| auto *d = resolveUnique(pe->path->name, P4::ResolutionType::Any); | ||
| BUG_CHECK(d, "failed to resolve %s", pe); | ||
| if (auto *ps = d->to<IR::ParserState>()) { | ||
| visit(ps, "transition"); | ||
| } else if (auto *act = d->to<IR::P4Action>()) { | ||
| visit(act, "actions"); | ||
| } else { | ||
| auto *obj = d->getNode(); // FIXME -- should be able to visit an INode | ||
| visit(obj); | ||
| } | ||
| } | ||
|
|
||
| bool preorder(IR::PathExpression *path) override { | ||
| visit_def(path); | ||
| return true; | ||
| } | ||
|
|
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| MultiVisitModifier(const MultiVisitModifier &) = default; | ||
| }; | ||
|
|
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| std::string getMultiVisitLoopSource() { | ||
| // Non-sensical parser with loops | ||
| return R"( | ||
| extern packet_in { | ||
| void extract<T> (out T hdr); | ||
| } | ||
| header Header { | ||
| bit<32> data; | ||
| } | ||
| struct H { | ||
| Header h1; | ||
| Header h2; | ||
| } | ||
| struct M { } | ||
| parser MyParser(packet_in pkt, out H hdr, out M meta) { | ||
| state start { | ||
| transition next; | ||
| } | ||
| state next { | ||
| transition select (hdr.h1.data) { | ||
| 0: state0; | ||
| 1: state1; | ||
| default: accept; | ||
| } | ||
| } | ||
| state state0 { | ||
| hdr.h1.setInvalid(); | ||
| transition select (hdr.h2.data) { | ||
| 2: state1; | ||
| default: next; | ||
| } | ||
| } | ||
| state state1 { | ||
| hdr.h2.setValid(); | ||
| transition select (hdr.h2.data) { | ||
| 1: state1; | ||
| 2: state0; | ||
| default: accept; | ||
| } | ||
| } | ||
| state accept { } | ||
| } | ||
| )"; | ||
| } | ||
|
|
||
| // This test fails when Visitor::Tracker::try_start does _not_ reset done on a previously-visited | ||
| // node | ||
| TEST_F(P4CVisitor, MultiVisitInspectorLoop) { | ||
| auto *program = | ||
| P4::parseP4String(getMultiVisitLoopSource(), CompilerOptions::FrontendVersion::P4_16); | ||
| ASSERT_TRUE(program != nullptr); | ||
|
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| program = program->apply(MultiVisitInspector()); | ||
| ASSERT_TRUE(program != nullptr); | ||
| } | ||
|
|
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| // This test fails when Visitor::ChangeTracker::try_start does _not_ reset visit_in_progress on a | ||
| // previously-visited node | ||
| TEST_F(P4CVisitor, MultiVisitModifierLoop) { | ||
| auto *program = | ||
| P4::parseP4String(getMultiVisitLoopSource(), CompilerOptions::FrontendVersion::P4_16); | ||
| ASSERT_TRUE(program != nullptr); | ||
|
|
||
| program = program->apply(MultiVisitModifier()); | ||
| ASSERT_TRUE(program != nullptr); | ||
| } | ||
|
|
||
| } // namespace Test |