Leave trailing comments after handling a possible trailing comma #10445
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Collaborator
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Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/11584/ |
JLHwung
reviewed
Sep 16, 2019
| node.trailingComments.push(leadingComment); | ||
| } | ||
| } | ||
| if (takeAllComments) this.state.leadingComments.length = 0; |
Contributor
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nit: this.state.leadingComments = [] is more idiomatic and should be marginally faster than this.state.leadingComments.length = 0 by saving calls to StoreICTrampoline.
The former is compiled to
-- </Users/jh/code/babel/packages/babel-parser/lib/index.js:6266:14> --
0x1fafdfb87845 545 48b8a92cd4eaa8090000 REX.W movq rax,0x9a8ead42ca9 ;; object: 0x09a8ead42ca9 <Map(PACKED_ELEMENTS)>
0x1fafdfb8784f 54f 498947ff REX.W movq [r15-0x1],rax
0x1fafdfb87853 553 498b9da0000000 REX.W movq rbx,[r13+0xa0] (root (empty_fixed_array))
0x1fafdfb8785a 55a 49895f07 REX.W movq [r15+0x7],rbx
0x1fafdfb8785e 55e 49895f0f REX.W movq [r15+0xf],rbx
0x1fafdfb87862 562 49c7471700000000 REX.W movq [r15+0x17],0x0
-- </Users/jh/code/babel/packages/babel-parser/lib/index.js:6266:37> --
0x1fafdfb8786a 56a 4d89b9cf000000 REX.W movq [r9+0xcf],r15
0x1fafdfb87871 571 48c7c30000fcff REX.W movq rbx,0xfffc0000
0x1fafdfb87878 578 4923d9 REX.W andq rbx,r9
0x1fafdfb8787b 57b f6430804 testb [rbx+0x8],0x4The latter is compiled to
-- </Users/jh/code/babel/packages/babel-parser/lib/index.js:6268:44> --
0x1fafde852e4e 44e 33c0 xorl rax,rax
0x1fafde852e50 450 498b8d280a0000 REX.W movq rcx,[r13+0xa28] (root (length_string))
0x1fafde852e57 457 48bf000000002b000000 REX.W movq rdi,0x2b00000000
0x1fafde852e61 461 488b75e0 REX.W movq rsi,[rbp-0x20]
-- Inlined Trampoline to StoreICTrampoline --
0x1fafde852e65 465 49ba40fb6c0001000000 REX.W movq r10,0x1006cfb40 (StoreICTrampoline)
0x1fafde852e6f 46f 41ffd2 call r10
0x1fafdfb877aa 4aa 4c8b4518 REX.W movq r8,[rbp+0x18]
0x1fafdfb877ae 4ae 48b8a92cd4eaa8090000 REX.W movq rax,0x9a8ead42ca9 ;; object: 0x09a8ead42ca9 <Map(PACKED_ELEMENTS)>
0x1fafdfb877b8 4b8 49bce990a15ea8090000 REX.W movq r12,0x9a85ea190e9 ;; object: 0x09a85ea190e9 <Map(HOLEY_ELEMENTS)>
0x1fafdfb877c2 4c2 49bbf994a15ea8090000 REX.W movq r11,0x9a85ea194f9 ;; object: 0x09a85ea194f9 <Map(HOLEY_ELEMENTS)>
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Oh I thought that resetting the length was faster because it doesn't create a new array. Will update 👍
JLHwung
approved these changes
Sep 16, 2019
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@banga Could you please review this PR if you have time? 🙏 |
banga
approved these changes
Sep 22, 2019
This was referenced Oct 3, 2019
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