mirror of
https://github.com/JakeHillion/object-introspection.git
synced 2024-09-19 11:09:05 +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
32 lines
630 B
CMake
32 lines
630 B
CMake
add_library(type_graph
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AddChildren.cpp
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AddPadding.cpp
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AlignmentCalc.cpp
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ClangTypeParser.cpp
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DrgnExporter.cpp
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DrgnParser.cpp
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EnforceCompatibility.cpp
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Flattener.cpp
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IdentifyContainers.cpp
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KeyCapture.cpp
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NameGen.cpp
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PassManager.cpp
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Printer.cpp
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Prune.cpp
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RemoveMembers.cpp
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RemoveTopLevelPointer.cpp
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TopoSorter.cpp
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TypeGraph.cpp
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TypeIdentifier.cpp
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Types.cpp
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)
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add_dependencies(type_graph libdrgn)
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target_link_libraries(type_graph
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container_info
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symbol_service
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"-L${DRGN_PATH}/.libs"
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drgn
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)
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target_include_directories(type_graph SYSTEM PUBLIC ${LLVM_INCLUDE_DIRS} ${CLANG_INCLUDE_DIRS})
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