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[WebAssembly] Add more support for weak symbols

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Add weak symbol tests to MC
Add symbol flags to output of `llvm-readobj -t`.

Differential Revision: https://reviews.llvm.org/D34635

llvm-svn: 306330
This commit is contained in:
Sam Clegg 2017-06-26 21:01:39 +00:00
parent cd830aa42d
commit bf996f1642
4 changed files with 72 additions and 0 deletions
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33
test/MC/WebAssembly/weak-alias.ll Normal file
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@ -0,0 +1,33 @@
; RUN: llc -mtriple wasm32-unknown-unknown-wasm -filetype=obj %s -o - | obj2yaml | FileCheck %s
; foo_alias() function is weak alias of function foo()
; Generates two exports of the same function, one of them weak
@foo_alias = weak hidden alias i32 (...), bitcast (i32 ()* @foo to i32 (...)*)
define hidden i32 @foo() #0 {
entry:
ret i32 0
}
; CHECK: - Type: EXPORT
; CHECK-NEXT: Exports:
; CHECK-NEXT: - Name: foo
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 0
; CHECK-NEXT: - Name: foo_alias
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 0
; CHECK: - Type: CUSTOM
; CHECK-NEXT: Name: name
; CHECK-NEXT: FunctionNames:
; CHECK-NEXT: - Index: 0
; CHECK-NEXT: Name: foo
; CHECK-NEXT: - Type: CUSTOM
; CHECK-NEXT: Name: linking
; CHECK-NEXT: SymbolInfo:
; CHECK-NEXT: - Name: foo_alias
; CHECK-NEXT: Flags: 1
; CHECK-NEXT: ...

34
test/MC/WebAssembly/weak.ll Normal file
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@ -0,0 +1,34 @@
; RUN: llc -mtriple wasm32-unknown-unknown-wasm -filetype=obj %s -o - | obj2yaml | FileCheck %s
; Weak external data reference
@weak_external_data = extern_weak global i32, align 4
; Weak function definition
define weak hidden i32 @weak_function() local_unnamed_addr #0 {
entry:
%0 = load i32, i32* @weak_external_data, align 4
ret i32 %0
}
; CHECK: - Type: IMPORT
; CHECK-NEXT: Imports:
; CHECK-NEXT: - Module: env
; CHECK-NEXT: Field: weak_external_data
; CHECK-NEXT: Kind: GLOBAL
; CHECK-NEXT: GlobalType: I32
; CHECK-NEXT: GlobalMutable: false
; CHECK: - Type: CUSTOM
; CHECK-NEXT: Name: name
; CHECK-NEXT: FunctionNames:
; CHECK-NEXT: - Index: 0
; CHECK-NEXT: Name: weak_function
; CHECK-NEXT: - Type: CUSTOM
; CHECK-NEXT: Name: linking
; CHECK-NEXT: SymbolInfo:
; CHECK-NEXT: - Name: weak_external_data
; CHECK-NEXT: Flags: 1
; CHECK-NEXT: - Name: weak_function
; CHECK-NEXT: Flags: 1
; CHECK-NEXT: ...

4
test/tools/llvm-readobj/symbols.test
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@ -75,17 +75,21 @@ WASM: Symbols [
WASM-NEXT: Symbol {
WASM-NEXT: Name: bar
WASM-NEXT: Type: GLOBAL_IMPORT (0x2)
WASM-NEXT: Flags: 0x0
WASM-NEXT: }
WASM-NEXT: Symbol {
WASM-NEXT: Name: baz
WASM-NEXT: Type: GLOBAL_IMPORT (0x2)
WASM-NEXT: Flags: 0x0
WASM-NEXT: }
WASM-NEXT: Symbol {
WASM-NEXT: Name: foo
WASM-NEXT: Type: FUNCTION_EXPORT (0x1)
WASM-NEXT: Flags: 0x0
WASM-NEXT: }
WASM-NEXT: Symbol {
WASM-NEXT: Name: foo
WASM-NEXT: Type: DEBUG_FUNCTION_NAME (0x4)
WASM-NEXT: Flags: 0x0
WASM-NEXT: }
WASM-NEXT: ]

1
tools/llvm-readobj/WasmDumper.cpp
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@ -183,6 +183,7 @@ void WasmDumper::printSymbol(const SymbolRef &Sym) {
WasmSymbol Symbol = Obj->getWasmSymbol(Sym.getRawDataRefImpl());
W.printString("Name", Symbol.Name);
W.printEnum("Type", static_cast<unsigned>(Symbol.Type), makeArrayRef(WasmSymbolTypes));
W.printHex("Flags", Symbol.Flags);
}
}