mirror of
https://github.com/JakeHillion/object-introspection.git
synced 2024-09-19 19:19:05 +01:00
55989a9156
Summary:
oilgen: migrate to source parsing
Using debug information generated from partial source (that is, not the final
binary) has been insufficient to generally generate OIL code.
A particular example is pointers to templates:
```cpp
#include <oi/oi.h>
template <typename T>
struct Foo {
T t;
};
template <typename T>
struct Bar {
Foo<T>& f;
};
void foo(const Bar<int>& b) {
oi::introspect(b);
}
```
The pointer/reference to `Foo<int>` appears in DWARF with
`DW_AT_declaration(true)` because it could be specialised before its usage.
However, with OIL, we are creating an implicit usage site in the
`oi::introspect` call that the compiler is unable to see.
This change reworks OILGen to work from a Clang command line rather than debug
information. We setup and run a compiler on the source, giving us access to an
AST and Semantic Analyser. We then:
- Find the `oi::introspect` template.
- Iterate through each of its callsites for their type.
- Run `ClangTypeParser::parse` on each type.
- Run codegen.
- Compile into an object file.
Having access to the semantic analyser allows us to forcefully complete a type,
as it would be if it was used in the initial code.
Test Plan:
hope
`buck2 run fbcode//mode/opt fbcode//object-introspection/oil/examples/compile-time:compile-time`
Reviewed By: tyroguru
Differential Revision: D51854477
Pulled By: JakeHillion
69 lines
1.9 KiB
TOML
69 lines
1.9 KiB
TOML
[info]
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type_name = "std::basic_string"
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stub_template_params = [2]
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ctype = "STRING_TYPE"
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header = "string"
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# Old:
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typeName = "std::basic_string<"
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ns = ["namespace std"]
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numTemplateParams = 1
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replaceTemplateParamIndex = []
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[codegen]
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decl = """
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template<typename T, typename Traits, typename Allocator>
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void getSizeType(const %1%<T, Traits, Allocator> &container, size_t& returnArg);
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"""
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func = """
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template<typename T, typename Traits, typename Allocator>
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void getSizeType(const %1%<T, Traits, Allocator> &container, size_t& returnArg)
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{
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SAVE_SIZE(sizeof(%1%<T>));
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SAVE_DATA((uintptr_t)container.capacity());
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SAVE_DATA((uintptr_t)container.size());
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// Test for small string optimisation - whether the underlying string is
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// contained within the string object.
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SAVE_SIZE(
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((uintptr_t)container.data() < (uintptr_t)(&container + sizeof(%1%<T>)))
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&&
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((uintptr_t)container.data() >= (uintptr_t)&container)
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? 0 : (container.capacity() * sizeof(T))
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);
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}
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"""
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traversal_func = """
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bool sso = ((uintptr_t)container.data() <
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(uintptr_t)(&container + sizeof(std::__cxx11::basic_string<T0>))) &&
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((uintptr_t)container.data() >= (uintptr_t)&container);
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return returnArg.write(container.capacity())
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.write(sso)
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.write(container.size());
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"""
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[[codegen.processor]]
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type = "types::st::VarInt<DB>"
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func = """
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uint64_t capacity = std::get<ParsedData::VarInt>(d.val).value;
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el.container_stats.emplace(result::Element::ContainerStats { .capacity = capacity });
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"""
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[[codegen.processor]]
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type = "types::st::VarInt<DB>"
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func = """
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bool sso = std::get<ParsedData::VarInt>(d.val).value;
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if (!sso)
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el.exclusive_size += el.container_stats->capacity * sizeof(T0);
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"""
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[[codegen.processor]]
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type = "types::st::VarInt<DB>"
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func = """
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el.container_stats->length = std::get<ParsedData::VarInt>(d.val).value;
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"""
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