bjoernager/rust
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Rollup merge of #53290 - whitequark:fix-35741, r=nagisa

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Make LLVM emit assembly comments with -Z asm-comments

Fixes #35741, and makes `-Z asm-comments` actually do something useful.

Before:
```
	.section	.text.main,"ax",@progbits
	.globl	main
	.p2align	4, 0x90
	.type	main,@function
main:
	.cfi_startproc
	pushq	%rax
	.cfi_def_cfa_offset 16
	movslq	%edi, %rax
	leaq	_ZN1t4main17he95a7d4f1843730eE(%rip), %rdi
	movq	%rsi, (%rsp)
	movq	%rax, %rsi
	movq	(%rsp), %rdx
	callq	_ZN3std2rt10lang_start17h3121da83b2bc3697E
	movl	%eax, %ecx
	movl	%ecx, %eax
	popq	%rcx
	.cfi_def_cfa_offset 8
	retq
.Lfunc_end8:
	.size	main, .Lfunc_end8-main
	.cfi_endproc
```

After:
```
	.section	.text.main,"ax",@progbits
	.globl	main                    # -- Begin function main
	.p2align	4, 0x90
	.type	main,@function
main:                                   # @main
	.cfi_startproc
# %bb.0:
	pushq	%rax
	.cfi_def_cfa_offset 16
	movslq	%edi, %rax
	leaq	_ZN1t4main17he95a7d4f1843730eE(%rip), %rdi
	movq	%rsi, (%rsp)            # 8-byte Spill
	movq	%rax, %rsi
	movq	(%rsp), %rdx            # 8-byte Reload
	callq	_ZN3std2rt10lang_start17h3121da83b2bc3697E
	movl	%eax, %ecx
	movl	%ecx, %eax
	popq	%rcx
	.cfi_def_cfa_offset 8
	retq
.Lfunc_end8:
	.size	main, .Lfunc_end8-main
	.cfi_endproc
                                        # -- End function
```
This commit is contained in:
kennytm 2018-08-14 23:59:16 +08:00 • committed by GitHub
commit 47f66e7372
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3 changed files with 9 additions and 2 deletions
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3
src/librustc_codegen_llvm/back/write.rs
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@ -180,6 +180,8 @@ pub fn target_machine_factory(sess: &Session, find_features: bool)
let is_pie_binary = !find_features && is_pie_binary(sess);
let trap_unreachable = sess.target.target.options.trap_unreachable;
let asm_comments = sess.asm_comments();
Arc::new(move || {
let tm = unsafe {
llvm::LLVMRustCreateTargetMachine(
@ -193,6 +195,7 @@ pub fn target_machine_factory(sess: &Session, find_features: bool)
fdata_sections,
trap_unreachable,
singlethread,
asm_comments,
)
};