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//===- GtestMatchers.cpp - AST Matchers for Gtest ---------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "clang/ASTMatchers/GtestMatchers.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/Support/Timer.h"
#include <deque>
#include <memory>
#include <set>
namespace clang {
namespace ast_matchers {
static DeclarationMatcher getComparisonDecl(GtestCmp Cmp) {
switch (Cmp) {
case GtestCmp::Eq:
return cxxMethodDecl(hasName("Compare"),
ofClass(cxxRecordDecl(isSameOrDerivedFrom(
hasName("::testing::internal::EqHelper")))));
case GtestCmp::Ne:
return functionDecl(hasName("::testing::internal::CmpHelperNE"));
case GtestCmp::Ge:
return functionDecl(hasName("::testing::internal::CmpHelperGE"));
case GtestCmp::Gt:
return functionDecl(hasName("::testing::internal::CmpHelperGT"));
case GtestCmp::Le:
return functionDecl(hasName("::testing::internal::CmpHelperLE"));
case GtestCmp::Lt:
return functionDecl(hasName("::testing::internal::CmpHelperLT"));
}
llvm_unreachable("Unhandled GtestCmp enum");
}
static llvm::StringRef getAssertMacro(GtestCmp Cmp) {
switch (Cmp) {
case GtestCmp::Eq:
return "ASSERT_EQ";
case GtestCmp::Ne:
return "ASSERT_NE";
case GtestCmp::Ge:
return "ASSERT_GE";
case GtestCmp::Gt:
return "ASSERT_GT";
case GtestCmp::Le:
return "ASSERT_LE";
case GtestCmp::Lt:
return "ASSERT_LT";
}
llvm_unreachable("Unhandled GtestCmp enum");
}
static llvm::StringRef getExpectMacro(GtestCmp Cmp) {
switch (Cmp) {
case GtestCmp::Eq:
return "EXPECT_EQ";
case GtestCmp::Ne:
return "EXPECT_NE";
case GtestCmp::Ge:
return "EXPECT_GE";
case GtestCmp::Gt:
return "EXPECT_GT";
case GtestCmp::Le:
return "EXPECT_LE";
case GtestCmp::Lt:
return "EXPECT_LT";
}
llvm_unreachable("Unhandled GtestCmp enum");
}
// In general, AST matchers cannot match calls to macros. However, we can
// simulate such matches if the macro definition has identifiable elements that
// themselves can be matched. In that case, we can match on those elements and
// then check that the match occurs within an expansion of the desired
// macro. The more uncommon the identified elements, the more efficient this
// process will be.
//
// We use this approach to implement the derived matchers gtestAssert and
// gtestExpect.
internal::BindableMatcher<Stmt> gtestAssert(GtestCmp Cmp, StatementMatcher Left,
StatementMatcher Right) {
return callExpr(callee(getComparisonDecl(Cmp)),
isExpandedFromMacro(getAssertMacro(Cmp)),
hasArgument(2, Left), hasArgument(3, Right));
}
internal::BindableMatcher<Stmt> gtestExpect(GtestCmp Cmp, StatementMatcher Left,
StatementMatcher Right) {
return callExpr(callee(getComparisonDecl(Cmp)),
isExpandedFromMacro(getExpectMacro(Cmp)),
hasArgument(2, Left), hasArgument(3, Right));
}
} // end namespace ast_matchers
} // end namespace clang
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