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b94988cc08
This change was originally landed in: 5000a1b4b9edeb9e994f2a5b36da8d48599bea49
It was reverted in: 061e071d8c9b98526f35cad55a918a4f1615afd4
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
91 lines
3.7 KiB
LLVM
91 lines
3.7 KiB
LLVM
; RUN: llc -filetype=obj %s -o - | obj2yaml | FileCheck %s
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target triple = "wasm32-unknown-unknown"
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@.str1 = private unnamed_addr constant [6 x i8] c"hello\00", align 1
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@.str2 = private unnamed_addr constant [6 x i8] c"world\00", align 1
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@a = global i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str1, i32 0, i32 0), align 8
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@b = global i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str2, i32 0, i32 0), align 8
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; CHECK: - Type: DATA{{$}}
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; CHECK-NEXT: Relocations:
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; CHECK-NEXT: - Type: R_WASM_MEMORY_ADDR_I32
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; CHECK-NEXT: Index: 0
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; CHECK-NEXT: Offset: 0x1C
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; CHECK-NEXT: - Type: R_WASM_MEMORY_ADDR_I32
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; CHECK-NEXT: Index: 1
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; CHECK-NEXT: Offset: 0x25
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; CHECK-NEXT: Segments:
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; CHECK-NEXT: - SectionOffset: 6
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; CHECK-NEXT: InitFlags: 0
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; CHECK-NEXT: Offset:
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; CHECK-NEXT: Opcode: I32_CONST
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; CHECK-NEXT: Value: 0
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; CHECK-NEXT: Content: 68656C6C6F00
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; CHECK-NEXT: - SectionOffset: 17
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; CHECK-NEXT: InitFlags: 0
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; CHECK-NEXT: Offset:
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; CHECK-NEXT: Opcode: I32_CONST
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; CHECK-NEXT: Value: 6
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; CHECK-NEXT: Content: 776F726C6400
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; CHECK-NEXT: - SectionOffset: 28
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; CHECK-NEXT: InitFlags: 0
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; CHECK-NEXT: Offset:
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; CHECK-NEXT: Opcode: I32_CONST
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; CHECK-NEXT: Value: 16
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; CHECK-NEXT: Content: '00000000'
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; CHECK-NEXT: - SectionOffset: 37
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; CHECK-NEXT: InitFlags: 0
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; CHECK-NEXT: Offset:
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; CHECK-NEXT: Opcode: I32_CONST
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; CHECK-NEXT: Value: 24
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; CHECK-NEXT: Content: '06000000'
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; CHECK-NEXT: - Type: CUSTOM
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; CHECK-NEXT: Name: linking
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; CHECK-NEXT: Version: 2
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; CHECK-NEXT: SymbolTable:
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; CHECK-NEXT: - Index: 0
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; CHECK-NEXT: Kind: DATA
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; CHECK-NEXT: Name: .L.str1
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; CHECK-NEXT: Flags: [ BINDING_LOCAL ]
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; CHECK-NEXT: Segment: 0
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; CHECK-NEXT: Size: 6
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; CHECK-NEXT: - Index: 1
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; CHECK-NEXT: Kind: DATA
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; CHECK-NEXT: Name: .L.str2
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; CHECK-NEXT: Flags: [ BINDING_LOCAL ]
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; CHECK-NEXT: Segment: 1
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; CHECK-NEXT: Size: 6
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; CHECK-NEXT: - Index: 2
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; CHECK-NEXT: Kind: DATA
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; CHECK-NEXT: Name: a
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; CHECK-NEXT: Flags: [ ]
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; CHECK-NEXT: Segment: 2
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; CHECK-NEXT: Size: 4
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; CHECK-NEXT: - Index: 3
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; CHECK-NEXT: Kind: DATA
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; CHECK-NEXT: Name: b
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; CHECK-NEXT: Flags: [ ]
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; CHECK-NEXT: Segment: 3
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; CHECK-NEXT: Size: 4
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; CHECK-NEXT: SegmentInfo:
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; CHECK-NEXT: - Index: 0
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; CHECK-NEXT: Name: .rodata..L.str1
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; CHECK-NEXT: Alignment: 0
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; CHECK-NEXT: Flags: [ STRINGS ]
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; CHECK-NEXT: - Index: 1
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; CHECK-NEXT: Name: .rodata..L.str2
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; CHECK-NEXT: Alignment: 0
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; CHECK-NEXT: Flags: [ STRINGS ]
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; CHECK-NEXT: - Index: 2
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; CHECK-NEXT: Name: .data.a
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; CHECK-NEXT: Alignment: 3
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; CHECK-NEXT: Flags: [ ]
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; CHECK-NEXT: - Index: 3
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; CHECK-NEXT: Name: .data.b
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; CHECK-NEXT: Alignment: 3
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; CHECK-NEXT: Flags: [ ]
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; CHECK_NEXT: ...
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