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Rollup merge of #132590 - Zalathar:z-timings-stats, r=jieyouxu

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Simplify FFI calls for `-Ztime-llvm-passes` and `-Zprint-codegen-stats`

The existing code for these unstable LLVM-infodump flags was jumping through hoops to pass an allocated C string across the FFI boundary, when it's much simpler to just write to a `&RustString` instead.
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Stuart Cook 2024-11-08 18:51:30 +11:00 • committed by GitHub
commit 3a48d80155
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3 changed files with 16 additions and 45 deletions
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10
compiler/rustc_codegen_llvm/src/llvm/ffi.rs
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@ -1765,11 +1765,13 @@ unsafe extern "C" {
/// Returns a string describing the last error caused by an LLVMRust* call.
pub fn LLVMRustGetLastError() -> *const c_char;
/// Print the pass timings since static dtors aren't picking them up.
pub fn LLVMRustPrintPassTimings(size: *const size_t) -> *const c_char;
/// Prints the timing information collected by `-Ztime-llvm-passes`.
#[expect(improper_ctypes)]
pub(crate) fn LLVMRustPrintPassTimings(OutStr: &RustString);
/// Print the statistics since static dtors aren't picking them up.
pub fn LLVMRustPrintStatistics(size: *const size_t) -> *const c_char;
/// Prints the statistics collected by `-Zprint-codegen-stats`.
#[expect(improper_ctypes)]
pub(crate) fn LLVMRustPrintStatistics(OutStr: &RustString);
/// Prepares inline assembly.
pub fn LLVMRustInlineAsm(