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[WebAssembly] Elide data segments for .bss sections
Summary: WebAssembly memories are zero-initialized, so when module does not import its memory initializing .bss sections is guaranteed to be a no-op. To reduce binary size and initialization time, .bss sections are simply not emitted into the final binary unless the memory is imported. Reviewers: sbc100 Subscribers: dschuff, jgravelle-google, aheejin, sunfish, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D68965 llvm-svn: 374940
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,14 @@ | ||
; RUN: llc -filetype=obj %s -o %t.o | ||
; RUN: wasm-ld -no-gc-sections --no-entry %t.o -o %t.wasm | ||
; RUN: obj2yaml %t.wasm | FileCheck %s | ||
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; Test that the data section is skipped entirely when there are only | ||
; bss segments | ||
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target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128" | ||
target triple = "wasm32-unknown-unknown" | ||
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@a = global [1000 x i8] zeroinitializer, align 1 | ||
@b = global i32 0 | ||
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; CHECK-NOT: - Type: DATA |
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