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Reland "[WebAssembly] Add support for visibility flag""

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Subscribers: jfb, dschuff, jgravelle-google, aheejin, sunfish

Differential Revision: https://reviews.llvm.org/D40773

llvm-svn: 319627
This commit is contained in:
Sam Clegg 2017-12-03 02:38:04 +00:00
parent a2b35dac03
commit 4b27c0554c
14 changed files with 105 additions and 47 deletions
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4
lld/test/wasm/Inputs/call-indirect.ll
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@ -4,13 +4,13 @@ target triple = "wasm32-unknown-unknown-wasm"
@indirect_bar = hidden local_unnamed_addr global i32 ()* @bar, align 4
; Function Attrs: norecurse nounwind readnone
define hidden i32 @bar() #0 {
define i32 @bar() #0 {
entry:
ret i32 1
}
; Function Attrs: nounwind
define hidden void @call_bar_indirect() local_unnamed_addr #1 {
define void @call_bar_indirect() local_unnamed_addr #1 {
entry:
%0 = load i32 ()*, i32 ()** @indirect_bar, align 4
%call = tail call i32 %0() #2

14
lld/test/wasm/Inputs/hidden.ll Normal file
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@ -0,0 +1,14 @@
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown-wasm"
; Function Attrs: norecurse nounwind readnone
define hidden i32 @archiveHidden() #0 {
entry:
ret i32 0
}
; Function Attrs: norecurse nounwind readnone
define i32 @archiveDefault() #1 {
entry:
ret i32 0
}

2
lld/test/wasm/Inputs/ret32.ll
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@ -2,7 +2,7 @@ target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown-wasm"
; Function Attrs: norecurse nounwind readnone
define hidden i32 @ret32(float %arg) #0 {
define i32 @ret32(float %arg) #0 {
entry:
ret i32 0
; ptrtoint (i32 (float)* @ret32 to i32)

2
lld/test/wasm/Inputs/ret64.ll
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@ -1,7 +1,7 @@
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown-wasm"
define hidden i64 @ret64(double %arg) local_unnamed_addr #0 {
define i64 @ret64(double %arg) local_unnamed_addr #0 {
entry:
ret i64 1
}

2
lld/test/wasm/Inputs/weak-alias.ll
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@ -5,7 +5,7 @@ entry:
@bar = weak alias i32 (), i32 ()* @foo
define hidden i32 @call_bar() #0 {
define i32 @call_bar() #0 {
entry:
%call = call i32 @bar()
ret i32 %call

12
lld/test/wasm/call-indirect.ll
View File

@ -11,16 +11,16 @@
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown-wasm"
@indirect_func = hidden local_unnamed_addr global i32 ()* @foo, align 4
@indirect_func = local_unnamed_addr global i32 ()* @foo, align 4
; Function Attrs: norecurse nounwind readnone
define hidden i32 @foo() #0 {
define i32 @foo() #0 {
entry:
ret i32 1
}
; Function Attrs: nounwind
define hidden void @_start() local_unnamed_addr #1 {
define void @_start() local_unnamed_addr #1 {
entry:
%0 = load i32 ()*, i32 ()** @indirect_func, align 4
%call = tail call i32 %0() #2
@ -63,6 +63,9 @@ entry:
; CHECK-NEXT: - Name: memory
; CHECK-NEXT: Kind: MEMORY
; CHECK-NEXT: Index: 0
; CHECK-NEXT: - Name: _start
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 3
; CHECK-NEXT: - Name: bar
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 0
@ -72,9 +75,6 @@ entry:
; CHECK-NEXT: - Name: foo
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 2
; CHECK-NEXT: - Name: _start
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 3
; CHECK: - Type: ELEM
; CHECK-NEXT: Segments:
; CHECK-NEXT: - Offset:

2
lld/test/wasm/entry.ll
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@ -7,7 +7,7 @@
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown-wasm"
define hidden void @entry() local_unnamed_addr #0 {
define void @entry() local_unnamed_addr #0 {
entry:
ret void
}

46
lld/test/wasm/visibility-hidden.ll Normal file
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@ -0,0 +1,46 @@
; RUN: llc -mtriple wasm32-unknown-unknown-wasm -filetype=obj -o %t.o %s
; RUN: llc -mtriple=wasm32-unknown-unknown-wasm -filetype=obj %S/Inputs/hidden.ll -o %t2.o
; RUN: llvm-ar rcs %t2.a %t2.o
; RUN: lld -flavor wasm %t.o %t2.a -o %t.wasm
; RUN: obj2yaml %t.wasm | FileCheck %s
; Test that hidden symbols are not exported, whether pulled in from an archive
; or directly.
define hidden i32 @objectHidden() {
entry:
ret i32 0
}
define i32 @objectDefault() {
entry:
ret i32 0
}
declare i32 @archiveHidden()
declare i32 @archiveDefault()
define i32 @_start() {
entry:
%call1 = call i32 @objectHidden()
%call2 = call i32 @objectDefault()
%call3 = call i32 @archiveHidden()
%call4 = call i32 @archiveDefault()
ret i32 0
}
; CHECK: - Type: EXPORT
; CHECK-NEXT: Exports:
; CHECK-NEXT: - Name: memory
; CHECK-NEXT: Kind: MEMORY
; CHECK-NEXT: Index: 0
; CHECK-NEXT: - Name: _start
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 2
; CHECK-NEXT: - Name: archiveDefault
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 4
; CHECK-NEXT: - Name: objectDefault
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 1
; CHECK-NEXT: - Type:

6
lld/test/wasm/weak-alias-overide.ll
View File

@ -53,12 +53,12 @@ entry:
; CHECK-NEXT: - Name: memory
; CHECK-NEXT: Kind: MEMORY
; CHECK-NEXT: Index: 0
; CHECK-NEXT: - Name: bar
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 0
; CHECK-NEXT: - Name: _start
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 1
; CHECK-NEXT: - Name: bar
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 0
; CHECK-NEXT: - Name: foo
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 2

6
lld/test/wasm/weak-alias.ll
View File

@ -47,12 +47,12 @@ entry:
; CHECK-NEXT: - Name: memory
; CHECK-NEXT: Kind: MEMORY
; CHECK-NEXT: Index: 0
; CHECK-NEXT: - Name: bar
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 1
; CHECK-NEXT: - Name: _start
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 0
; CHECK-NEXT: - Name: bar
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 1
; CHECK-NEXT: - Name: foo
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 1

12
lld/test/wasm/weak-external.ll
View File

@ -9,16 +9,16 @@
declare extern_weak i32 @foo()
define hidden i8* @get_address_of_foo() #0 {
define i8* @get_address_of_foo() #0 {
entry:
ret i8* bitcast (i32 ()* @foo to i8*)
}
define hidden i32* @get_address_of_global_var() #0 {
define i32* @get_address_of_global_var() #0 {
ret i32* @global_var
}
define hidden i32 @_start() #0 {
define i32 @_start() #0 {
entry:
%0 = load i32, i32* @global_var, align 4
ret i32 %0
@ -57,15 +57,15 @@ entry:
; CHECK-NEXT: - Name: memory
; CHECK-NEXT: Kind: MEMORY
; CHECK-NEXT: Index: 0
; CHECK-NEXT: - Name: _start
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 2
; CHECK-NEXT: - Name: get_address_of_foo
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 0
; CHECK-NEXT: - Name: get_address_of_global_var
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 1
; CHECK-NEXT: - Name: _start
; CHECK-NEXT: Kind: FUNCTION
; CHECK-NEXT: Index: 2
; CHECK-NEXT: - Type: ELEM
; CHECK-NEXT: Segments:
; CHECK-NEXT: - Offset:

2
lld/wasm/Symbols.cpp
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@ -74,6 +74,8 @@ void Symbol::update(Kind K, InputFile *F, const WasmSymbol *WasmSym,
bool Symbol::isWeak() const { return Sym && Sym->isWeak(); }
bool Symbol::isHidden() const { return Sym && Sym->isHidden(); }
std::string lld::toString(wasm::Symbol &Sym) {
return wasm::displayName(Sym.getName());
}

1
lld/wasm/Symbols.h
View File

@ -58,6 +58,7 @@ public:
bool isGlobal() const { return !isFunction(); }
bool isLocal() const { return IsLocal; }
bool isWeak() const;
bool isHidden() const;
// Returns the symbol name.
StringRef getName() const { return Name; }

41
lld/wasm/Writer.cpp
View File

@ -259,22 +259,26 @@ void Writer::createTableSection() {
void Writer::createExportSection() {
// Memory is and main function are exported for executables.
bool ExportMemory = !Config->Relocatable && !Config->ImportMemory;
bool ExportMain = !Config->Relocatable;
bool ExportOther = true; // Config->Relocatable;
bool ExportOther = true; // ??? TODO Config->Relocatable;
bool ExportHidden = Config->Relocatable;
Symbol *EntrySym = Symtab->find(Config->Entry);
bool ExportEntry = !Config->Relocatable && EntrySym && EntrySym->isDefined();
uint32_t NumExports = 0;
if (ExportMemory)
++NumExports;
if (ExportMain && !ExportOther)
if (ExportEntry)
++NumExports;
if (ExportOther) {
for (ObjFile *File : Symtab->ObjectFiles) {
for (Symbol *Sym : File->getSymbols()) {
if (!Sym->isFunction() || Sym->isLocal() || Sym->isUndefined() ||
Sym->WrittenToSymtab)
(Sym->isHidden() && !ExportHidden) || Sym->WrittenToSymtab)
continue;
if (Sym == EntrySym)
continue;
Sym->WrittenToSymtab = true;
++NumExports;
@ -298,27 +302,21 @@ void Writer::createExportSection() {
writeExport(OS, MemoryExport);
}
if (ExportMain) {
Symbol *Sym = Symtab->find(Config->Entry);
if (Sym->isDefined()) {
if (!Sym->isFunction())
fatal("entry point is not a function: " + Sym->getName());
if (!ExportOther) {
WasmExport MainExport;
MainExport.Name = Config->Entry;
MainExport.Kind = WASM_EXTERNAL_FUNCTION;
MainExport.Index = Sym->getOutputIndex();
writeExport(OS, MainExport);
}
}
if (ExportEntry) {
WasmExport EntryExport;
EntryExport.Name = Config->Entry;
EntryExport.Kind = WASM_EXTERNAL_FUNCTION;
EntryExport.Index = EntrySym->getOutputIndex();
writeExport(OS, EntryExport);
}
if (ExportOther) {
for (ObjFile *File : Symtab->ObjectFiles) {
for (Symbol *Sym : File->getSymbols()) {
if (!Sym->isFunction() || Sym->isLocal() | Sym->isUndefined() ||
!Sym->WrittenToSymtab)
if (!Sym->isFunction() || Sym->isLocal() || Sym->isUndefined() ||
(Sym->isHidden() && !ExportHidden) || !Sym->WrittenToSymtab)
continue;
if (Sym == EntrySym)
continue;
Sym->WrittenToSymtab = false;
log("Export: " + Sym->getName());
@ -332,9 +330,6 @@ void Writer::createExportSection() {
writeExport(OS, Export);
}
}
// TODO(sbc): Export local symbols too, Even though they are not part
// of the symbol table?
}
}