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llvm-project/lld/test/wasm/data-layout.ll
Thomas Lively 21143b93a6 [WebAssembly] Sort output data sections to place .bss last 
Summary:
This was always the intended behavior, but had not been
implemented. This ordering is important for Emscripten when generating
.mem files while compiling to JS, since only zeros at the end of
initialized memory can be dropped.

Fixes https://github.com/emscripten-core/emscripten/issues/8999

Reviewers: sbc100

Subscribers: dschuff, jgravelle-google, aheejin, sunfish, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67736

llvm-svn: 372284
2019-09-19 01:14:59 +00:00

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; RUN: llc -filetype=obj %p/Inputs/hello.ll -o %t.hello.o
; RUN: llc -filetype=obj %s -o %t.o
target triple = "wasm32-unknown-unknown"
@foo = hidden global i32 1, align 4
@aligned_bar = hidden global i32 3, align 16
@hello_str = external global i8*
@external_ref = global i8** @hello_str, align 8
%struct.s = type { i32, i32 }
@local_struct = hidden global %struct.s zeroinitializer, align 4
@local_struct_internal_ptr = hidden local_unnamed_addr global i32* getelementptr inbounds (%struct.s, %struct.s* @local_struct, i32 0, i32 1), align 4
; RUN: wasm-ld -no-gc-sections --export=__data_end --export=__heap_base --allow-undefined --no-entry -o %t.wasm %t.o %t.hello.o
; RUN: obj2yaml %t.wasm | FileCheck %s
; CHECK: - Type: MEMORY
; CHECK-NEXT: Memories:
; CHECK-NEXT: - Initial: 0x00000002
; CHECK-NEXT: - Type: GLOBAL
; CHECK-NEXT: Globals:
; CHECK-NEXT: - Index: 0
; CHECK-NEXT: Type: I32
; CHECK-NEXT: Mutable: true
; CHECK-NEXT: InitExpr:
; CHECK-NEXT: Opcode: I32_CONST
; CHECK-NEXT: Value: 66624
; CHECK-NEXT: - Index: 1
; CHECK-NEXT: Type: I32
; CHECK-NEXT: Mutable: false
; CHECK-NEXT: InitExpr:
; CHECK-NEXT: Opcode: I32_CONST
; CHECK-NEXT: Value: 1080
; CHECK-NEXT: - Index: 2
; CHECK-NEXT: Type: I32
; CHECK-NEXT: Mutable: false
; CHECK-NEXT: InitExpr:
; CHECK-NEXT: Opcode: I32_CONST
; CHECK-NEXT: Value: 66624
; CHECK: - Type: DATA
; CHECK-NEXT: Segments:
; CHECK-NEXT: - SectionOffset: 7
; CHECK-NEXT: InitFlags: 0
; CHECK-NEXT: Offset:
; CHECK-NEXT: Opcode: I32_CONST
; CHECK-NEXT: Value: 1024
; CHECK-NEXT: Content: 68656C6C6F0A00
; CHECK-NEXT: - SectionOffset: 20
; CHECK-NEXT: InitFlags: 0
; CHECK-NEXT: Offset:
; CHECK-NEXT: Opcode: I32_CONST
; CHECK-NEXT: Value: 1040
; CHECK-NEXT: Content: '0100000000000000000000000000000003000000000000000004000034040000'
; CHECK-NEXT: - SectionOffset: 58
; CHECK-NEXT: InitFlags: 0
; CHECK-NEXT: Offset:
; CHECK-NEXT: Opcode: I32_CONST
; CHECK-NEXT: Value: 1072
; CHECK-NEXT: Content: '0000000000000000'
; CHECK-NEXT: - Type: CUSTOM
; RUN: wasm-ld -no-gc-sections --allow-undefined --no-entry \
; RUN: --initial-memory=131072 --max-memory=131072 -o %t_max.wasm %t.o \
; RUN: %t.hello.o
; RUN: obj2yaml %t_max.wasm | FileCheck %s -check-prefix=CHECK-MAX
; CHECK-MAX: - Type: MEMORY
; CHECK-MAX-NEXT: Memories:
; CHECK-MAX-NEXT: - Flags: [ HAS_MAX ]
; CHECK-MAX-NEXT: Initial: 0x00000002
; CHECK-MAX-NEXT: Maximum: 0x00000002
; RUN: wasm-ld -no-gc-sections --allow-undefined --no-entry --shared-memory \
; RUN: --features=atomics,bulk-memory --initial-memory=131072 \
; RUN: --max-memory=131072 -o %t_max.wasm %t.o %t.hello.o
; RUN: obj2yaml %t_max.wasm | FileCheck %s -check-prefix=CHECK-SHARED
; CHECK-SHARED: - Type: MEMORY
; CHECK-SHARED-NEXT: Memories:
; CHECK-SHARED-NEXT: - Flags: [ HAS_MAX, IS_SHARED ]
; CHECK-SHARED-NEXT: Initial: 0x00000002
; CHECK-SHARED-NEXT: Maximum: 0x00000002
; RUN: wasm-ld --relocatable -o %t_reloc.wasm %t.o %t.hello.o
; RUN: obj2yaml %t_reloc.wasm | FileCheck %s -check-prefix=RELOC
; RELOC: - Type: DATA
; RELOC-NEXT: Relocations:
; RELOC-NEXT: - Type: R_WASM_MEMORY_ADDR_I32
; RELOC-NEXT: Index: 3
; RELOC-NEXT: Offset: 0x00000024
; RELOC-NEXT: - Type: R_WASM_MEMORY_ADDR_I32
; RELOC-NEXT: Index: 4
; RELOC-NEXT: Offset: 0x0000002D
; RELOC-NEXT: Addend: 4
; RELOC-NEXT: Segments:
; RELOC-NEXT: - SectionOffset: 6
; RELOC-NEXT: InitFlags: 0
; RELOC-NEXT: Offset:
; RELOC-NEXT: Opcode: I32_CONST
; RELOC-NEXT: Value: 0
; RELOC-NEXT: Content: 68656C6C6F0A00
; RELOC-NEXT: - SectionOffset: 18
; RELOC-NEXT: InitFlags: 0
; RELOC-NEXT: Offset:
; RELOC-NEXT: Opcode: I32_CONST
; RELOC-NEXT: Value: 8
; RELOC-NEXT: Content: '01000000'
; RELOC-NEXT: - SectionOffset: 27
; RELOC-NEXT: InitFlags: 0
; RELOC-NEXT: Offset:
; RELOC-NEXT: Opcode: I32_CONST
; RELOC-NEXT: Value: 16
; RELOC-NEXT: Content: '03000000'
; RELOC-NEXT: - SectionOffset: 36
; RELOC-NEXT: InitFlags: 0
; RELOC-NEXT: Offset:
; RELOC-NEXT: Opcode: I32_CONST
; RELOC-NEXT: Value: 24
; RELOC-NEXT: Content: '00000000'
; RELOC-NEXT: - SectionOffset: 45
; RELOC-NEXT: InitFlags: 0
; RELOC-NEXT: Offset:
; RELOC-NEXT: Opcode: I32_CONST
; RELOC-NEXT: Value: 28
; RELOC-NEXT: Content: '24000000'
; RELOC-NEXT: - SectionOffset: 54
; RELOC-NEXT: InitFlags: 0
; RELOC-NEXT: Offset:
; RELOC-NEXT: Opcode: I32_CONST
; RELOC-NEXT: Value: 32
; RELOC-NEXT: Content: '0000000000000000'
; RELOC: SymbolTable:
; RELOC-NEXT: - Index: 0
; RELOC-NEXT: Kind: DATA
; RELOC-NEXT: Name: foo
; RELOC-NEXT: Flags: [ VISIBILITY_HIDDEN ]
; RELOC-NEXT: Segment: 1
; RELOC-NEXT: Size: 4
; RELOC-NEXT: - Index: 1
; RELOC-NEXT: Kind: DATA
; RELOC-NEXT: Name: aligned_bar
; RELOC-NEXT: Flags: [ VISIBILITY_HIDDEN ]
; RELOC-NEXT: Segment: 2
; RELOC-NEXT: Size: 4
; RELOC-NEXT: - Index: 2
; RELOC-NEXT: Kind: DATA
; RELOC-NEXT: Name: external_ref
; RELOC-NEXT: Flags: [ ]
; RELOC-NEXT: Segment: 3
; RELOC-NEXT: Size: 4
; RELOC-NEXT: - Index: 3
; RELOC-NEXT: Kind: DATA
; RELOC-NEXT: Name: hello_str
; RELOC-NEXT: Flags: [ ]
; RELOC-NEXT: Segment: 0
; RELOC-NEXT: Size: 7
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