[C-API] TVMFFIErrorSetRaisedFromCStrParts

[tqchen]

This PR introduces a new C API TVMFFIErrorSetRaisedFromCStrParts.

Background: when DSL compilers report errors, sometimes there are common parts that appears multiple times, such as function signature.

For example, the following are possible error messages from a DSL.

• Argument 1 mismatch in matmul(x: Tensor, y: Tensor), dtype mismatch
• Argument 2 mismatch in matmul(x: Tensor, y: Tensor), shape[0] mismatch

While we can store each message as const string and pass them to TVMFFIErrorSetRaisedFromCStr. There are quite a bit of duplication here.

This API allows us to store the error messages in parts, so parts like "mismatch in matmul(x: Tensor, y: Tensor)," get reused across multiple error messages. Because DSLs usually have minimal runtime, having a minimal helper C API would simplify the possible overhead of compiler construction side.

[gemini-code-assist]

Summary of Changes

Hello @tqchen, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the C API for error handling by introducing TVMFFIErrorSetRaisedFromCStrParts. This new function allows developers, especially those building DSL compilers, to construct error messages by concatenating multiple string parts. The primary benefit is to reduce memory overhead and duplication when common elements, such as function signatures, appear in various error reports. This change provides a more flexible and efficient mechanism for error reporting within the FFI framework.

Highlights

• New C API for Error Reporting: Introduced TVMFFIErrorSetRaisedFromCStrParts, a new C API designed to construct error messages from multiple string parts. This allows for efficient reuse of common message segments.
• Reduced Duplication in Error Messages: The new API addresses the problem of redundant error message components, particularly in DSL compilers, by enabling the concatenation of reusable string parts (e.g., function signatures).
• Documentation and Example Updates: Updated documentation in abi_overview.md and compiler_integration.md to reflect the new API. An example C file's comments were also updated to mention the new function.
• Version Bump: The project version has been updated from 0.1.0b16 to 0.1.0b17 in pyproject.toml and python/tvm_ffi/__init__.py.

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Code Review

This pull request introduces TVMFFIErrorSetRaisedFromCStrParts, a new C API for building error messages from multiple string parts. This is a useful feature for DSL compilers to reduce redundancy in error reporting. The changes are well-contained, including the API definition, implementation, tests, and documentation updates. I have a few suggestions to improve performance and fix minor documentation issues.