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Pass end position of span through inline ASM cookie

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This commit is contained in:
beetrees
2024-08-17 05:32:09 +01:00
parent f2abf827c1
commit 68227a3777
24 changed files with 1565 additions and 200 deletions
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21
compiler/rustc_codegen_llvm/src/asm.rs
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@@ -504,14 +504,13 @@ pub(crate) fn inline_asm_call<'ll>(
let key = "srcloc";
let kind = llvm::LLVMGetMDKindIDInContext(
bx.llcx,
key.as_ptr() as *const c_char,
key.as_ptr().cast::<c_char>(),
key.len() as c_uint,
);
// srcloc contains one integer for each line of assembly code.
// Unfortunately this isn't enough to encode a full span so instead
// we just encode the start position of each line.
// FIXME: Figure out a way to pass the entire line spans.
// `srcloc` contains one 64-bit integer for each line of assembly code,
// where the lower 32 bits hold the lo byte position and the upper 32 bits
// hold the hi byte position.
let mut srcloc = vec![];
if dia == llvm::AsmDialect::Intel && line_spans.len() > 1 {
// LLVM inserts an extra line to add the ".intel_syntax", so add
@@ -521,13 +520,13 @@ pub(crate) fn inline_asm_call<'ll>(
// due to the asm template string coming from a macro. LLVM will
// default to the first srcloc for lines that don't have an
// associated srcloc.
srcloc.push(llvm::LLVMValueAsMetadata(bx.const_i32(0)));
srcloc.push(llvm::LLVMValueAsMetadata(bx.const_u64(0)));
}
srcloc.extend(
line_spans
.iter()
.map(|span| llvm::LLVMValueAsMetadata(bx.const_i32(span.lo().to_u32() as i32))),
);
srcloc.extend(line_spans.iter().map(|span| {
llvm::LLVMValueAsMetadata(bx.const_u64(
u64::from(span.lo().to_u32()) | (u64::from(span.hi().to_u32()) << 32),
))
}));
let md = llvm::LLVMMDNodeInContext2(bx.llcx, srcloc.as_ptr(), srcloc.len());
let md = llvm::LLVMMetadataAsValue(&bx.llcx, md);
llvm::LLVMSetMetadata(call, kind, md);