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5000a1b4b9
This change adds support for a new WASM_SEG_FLAG_STRINGS flag in
the object format which works in a similar fashion to SHF_STRINGS
in the ELF world.
Unlike the ELF linker this support is currently limited:
- No support for SHF_MERGE (non-string merging)
- Always do full tail merging ("lo" can be merged with "hello")
- Only support single byte strings (p2align 0)
Like the ELF linker merging is only performed at `-O1` and above.
This fixes part of https://bugs.llvm.org/show_bug.cgi?id=48828,
although crucially it doesn't not currently support debug sections
because they are not represented by data segments (they are custom
sections)
Differential Revision: https://reviews.llvm.org/D97657
66 lines
2.4 KiB
ArmAsm
66 lines
2.4 KiB
ArmAsm
// RUN: llvm-mc -filetype=obj -triple=wasm32-unknown-unknown %s -o %t.o
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// RUN: wasm-ld -O2 %t.o -o %t.wasm --no-gc-sections --no-entry
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// RUN: obj2yaml %t.wasm | FileCheck %s --check-prefixes=COMMON,MERGE
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// RUN: wasm-ld -O0 %t.o -o %t2.wasm --no-gc-sections --no-entry
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// RUN: obj2yaml %t2.wasm | FileCheck --check-prefixes=COMMON,NOMERGE %s
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.section .rodata1,"S",@
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.asciz "abc"
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foo:
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.ascii "a"
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.size foo, 1
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bar:
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.asciz "bc"
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.asciz "bc"
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.size bar, 4
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.globl foo
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.globl bar
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.export_name foo, foo
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.export_name bar, bar
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// COMMON: - Type: GLOBAL
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// COMMON-NEXT: Globals:
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// COMMON-NEXT: - Index: 0
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// COMMON-NEXT: Type: I32
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// COMMON-NEXT: Mutable: true
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// COMMON-NEXT: InitExpr:
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// COMMON-NEXT: Opcode: I32_CONST
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// COMMON-NEXT: Value: 66576
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// COMMON-NEXT: - Index: 1
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// COMMON-NEXT: Type: I32
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// COMMON-NEXT: Mutable: false
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// COMMON-NEXT: InitExpr:
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// COMMON-NEXT: Opcode: I32_CONST
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// MERGE-NEXT: Value: 1024
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// NOMERGE-NEXT: Value: 1028
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// COMMON-NEXT: - Index: 2
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// COMMON-NEXT: Type: I32
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// COMMON-NEXT: Mutable: false
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// COMMON-NEXT: InitExpr:
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// COMMON-NEXT: Opcode: I32_CONST
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// MERGE-NEXT: Value: 1025
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// NOMERGE-NEXT: Value: 1029
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// COMMON-NEXT: - Type: EXPORT
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// COMMON-NEXT: Exports:
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// COMMON-NEXT: - Name: memory
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// COMMON-NEXT: Kind: MEMORY
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// COMMON-NEXT: Index: 0
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// COMMON-NEXT: - Name: foo
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// COMMON-NEXT: Kind: GLOBAL
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// COMMON-NEXT: Index: 1
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// COMMON-NEXT: - Name: bar
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// COMMON-NEXT: Kind: GLOBAL
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// COMMON-NEXT: Index: 2
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//
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// COMMON: - Type: DATA
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// COMMON-NEXT: Segments:
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// COMMON-NEXT: - SectionOffset: 7
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// COMMON-NEXT: InitFlags: 0
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// COMMON-NEXT: Offset:
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// COMMON-NEXT: Opcode: I32_CONST
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// COMMON-NEXT: Value: 1024
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// MERGE-NEXT: Content: '61626300'
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// NOMERGE-NEXT: Content: '6162630061626300626300'
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