[cfe-dev] Clang AST Matcher - Matching nested function and method calls

[David Lai via cfe-dev]

Hi,

I am quite new to clang AST matchers and wondering if you could help me with a match. I am writing a matcher to generate replacements.

Consider this,

SomeClientBuilder SCB(Foo& f) {
  return SomeClientBuilder.setFoo(f);
}

class SomeClientBuilder {
  Fruit apple(…);
  Fruit pear(…);
};

I would like to change
    “return SCB(foo).apple(req).get(…)”
to
    “return SCB().pear(req).via(foo).get(…)”

I would like to create a matcher that:
    - matches SCB so it has 1 argument of type Foo
    - matches method named apple() and is a method in SomeClientBuilder

After many attempts, I came up with two matchers.

1. cxxMemberCallExpr(callee(cxxMethodDecl(hasName("apple"), ofClass(cxxRecordDecl(hasName("SomeClientBuilder "))))))
    - this matcher does not restrict SCB to have 1 argument of type Foo

2. callExpr(callee(functionDecl(hasName("SCB"))), argumentCountIs(1), hasArgument(0, hasType(cxxRecordDecl(hasName("Foo")))))
    - this matcher does not match the “apple()” methods

I have tried combining the matchers together with no success. What do you think would be the best way to accomplish what I want to do?


Thanks,
David Lai




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