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Deduce captures(none) for a return place and parameters

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Extend attribute deduction to determine whether parameters using
indirect pass mode might have their address captured. Similarly to
the deduction of `readonly` attribute this information facilitates
memcpy optimizations.
This commit is contained in:
Tomasz Miąsko 2025-10-19 13:46:09 +02:00
parent 79966ae420
commit 2a03a948b9
17 changed files with 333 additions and 181 deletions
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5
compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
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@ -245,6 +245,7 @@ enum class LLVMRustAttributeKind {
DeadOnUnwind = 43,
DeadOnReturn = 44,
CapturesReadOnly = 45,
CapturesNone = 46,
};
static Attribute::AttrKind fromRust(LLVMRustAttributeKind Kind) {
@ -339,6 +340,7 @@ static Attribute::AttrKind fromRust(LLVMRustAttributeKind Kind) {
#endif
case LLVMRustAttributeKind::CapturesAddress:
case LLVMRustAttributeKind::CapturesReadOnly:
case LLVMRustAttributeKind::CapturesNone:
report_fatal_error("Should be handled separately");
}
report_fatal_error("bad LLVMRustAttributeKind");
@ -390,6 +392,9 @@ extern "C" void LLVMRustEraseInstFromParent(LLVMValueRef Instr) {
extern "C" LLVMAttributeRef
LLVMRustCreateAttrNoValue(LLVMContextRef C, LLVMRustAttributeKind RustAttr) {
#if LLVM_VERSION_GE(21, 0)
if (RustAttr == LLVMRustAttributeKind::CapturesNone) {
return wrap(Attribute::getWithCaptureInfo(*unwrap(C), CaptureInfo::none()));
}
if (RustAttr == LLVMRustAttributeKind::CapturesAddress) {
return wrap(Attribute::getWithCaptureInfo(
*unwrap(C), CaptureInfo(CaptureComponents::Address)));