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[WebAssembly] call_indirect issues table number relocs

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If the reference-types feature is enabled, call_indirect will explicitly
reference its corresponding function table via TABLE_NUMBER
relocations against a table symbol.

Also, as before, address-taken functions can also cause the function
table to be created, only with reference-types they additionally cause a
symbol table entry to be emitted.

Differential Revision: https://reviews.llvm.org/D90948
This commit is contained in:
Andy Wingo 2021-02-12 11:22:13 +01:00
parent f9a4546a12
commit d9c224e71b
21 changed files with 572 additions and 100 deletions
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7
include/llvm/MC/MCSymbolWasm.h
View File

@ -18,6 +18,7 @@ class MCSymbolWasm : public MCSymbol {
bool IsWeak = false;
bool IsHidden = false;
bool IsComdat = false;
bool OmitFromLinkingSection = false;
mutable bool IsUsedInInitArray = false;
mutable bool IsUsedInGOT = false;
Optional<StringRef> ImportModule;
@ -75,6 +76,12 @@ public:
bool isComdat() const { return IsComdat; }
void setComdat(bool isComdat) { IsComdat = isComdat; }
// wasm-ld understands a finite set of symbol types. This flag allows the
// compiler to avoid emitting symbol table entries that would confuse the
// linker, unless the user specifically requests the feature.
bool omitFromLinkingSection() const { return OmitFromLinkingSection; }
void setOmitFromLinkingSection() { OmitFromLinkingSection = true; }
bool hasImportModule() const { return ImportModule.hasValue(); }
StringRef getImportModule() const {
if (ImportModule.hasValue())

43
lib/MC/WasmObjectWriter.cpp
View File

@ -405,12 +405,17 @@ void WasmObjectWriter::writeHeader(const MCAssembler &Asm) {
void WasmObjectWriter::executePostLayoutBinding(MCAssembler &Asm,
const MCAsmLayout &Layout) {
// As a stopgap measure until call_indirect instructions start explicitly
// referencing the indirect function table via TABLE_NUMBER relocs, ensure
// that the indirect function table import makes it to the output if anything
// in the compilation unit has caused it to be present.
if (auto *Sym = Asm.getContext().lookupSymbol("__indirect_function_table"))
Asm.registerSymbol(*Sym);
// Some compilation units require the indirect function table to be present
// but don't explicitly reference it. This is the case for call_indirect
// without the reference-types feature, and also function bitcasts in all
// cases. In those cases the __indirect_function_table has the
// WASM_SYMBOL_NO_STRIP attribute. Here we make sure this symbol makes it to
// the assembler, if needed.
if (auto *Sym = Asm.getContext().lookupSymbol("__indirect_function_table")) {
const auto *WasmSym = static_cast<const MCSymbolWasm *>(Sym);
if (WasmSym->isNoStrip())
Asm.registerSymbol(*Sym);
}
// Build a map of sections to the function that defines them, for use
// in recordRelocation.
@ -509,21 +514,18 @@ void WasmObjectWriter::recordRelocation(MCAssembler &Asm,
Type == wasm::R_WASM_TABLE_INDEX_I32 ||
Type == wasm::R_WASM_TABLE_INDEX_I64) {
// TABLE_INDEX relocs implicitly use the default indirect function table.
// We require the function table to have already been defined.
auto TableName = "__indirect_function_table";
MCSymbolWasm *Sym = cast_or_null<MCSymbolWasm>(Ctx.lookupSymbol(TableName));
if (Sym) {
if (!Sym->isFunctionTable())
Ctx.reportError(
Fixup.getLoc(),
"symbol '__indirect_function_table' is not a function table");
if (!Sym || !Sym->isFunctionTable()) {
Ctx.reportError(
Fixup.getLoc(),
"symbol '__indirect_function_table' is not a function table");
} else {
Sym = cast<MCSymbolWasm>(Ctx.getOrCreateSymbol(TableName));
Sym->setFunctionTable();
// The default function table is synthesized by the linker.
Sym->setUndefined();
// Ensure that __indirect_function_table reaches the output.
Sym->setNoStrip();
Asm.registerSymbol(*Sym);
}
Sym->setUsedInReloc();
Asm.registerSymbol(*Sym);
}
// Relocation other than R_WASM_TYPE_INDEX_LEB are required to be
@ -1211,6 +1213,9 @@ static bool isInSymtab(const MCSymbolWasm &Sym) {
if (Sym.isSection())
return false;
if (Sym.omitFromLinkingSection())
return false;
return true;
}
@ -1674,10 +1679,6 @@ uint64_t WasmObjectWriter::writeOneObject(MCAssembler &Asm,
WS.setIndex(InvalidIndex);
continue;
}
if (WS.isTable() && WS.getName() == "__indirect_function_table") {
// For the moment, don't emit table symbols -- wasm-ld can't handle them.
continue;
}
LLVM_DEBUG(dbgs() << "adding to symtab: " << WS << "\n");
uint32_t Flags = 0;

80
lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
View File

@ -171,9 +171,6 @@ struct WebAssemblyOperand : public MCParsedAsmOperand {
static MCSymbolWasm *GetOrCreateFunctionTableSymbol(MCContext &Ctx,
const StringRef &Name) {
// FIXME: Duplicates functionality from
// MC/WasmObjectWriter::recordRelocation, as well as WebAssemblyCodegen's
// WebAssembly:getOrCreateFunctionTableSymbol.
MCSymbolWasm *Sym = cast_or_null<MCSymbolWasm>(Ctx.lookupSymbol(Name));
if (Sym) {
if (!Sym->isFunctionTable())
@ -223,6 +220,7 @@ class WebAssemblyAsmParser final : public MCTargetAsmParser {
};
std::vector<NestingType> NestingStack;
MCSymbolWasm *DefaultFunctionTable = nullptr;
MCSymbol *LastFunctionLabel = nullptr;
public:
@ -233,6 +231,15 @@ public:
setAvailableFeatures(ComputeAvailableFeatures(STI.getFeatureBits()));
}
void Initialize(MCAsmParser &Parser) override {
MCAsmParserExtension::Initialize(Parser);
DefaultFunctionTable = GetOrCreateFunctionTableSymbol(
getContext(), "__indirect_function_table");
if (!STI->checkFeatures("+reference-types"))
DefaultFunctionTable->setOmitFromLinkingSection();
}
#define GET_ASSEMBLER_HEADER
#include "WebAssemblyGenAsmMatcher.inc"
@ -480,6 +487,39 @@ public:
WebAssemblyOperand::IntOp{static_cast<int64_t>(BT)}));
}
bool addFunctionTableOperand(OperandVector &Operands, MCSymbolWasm *Sym,
SMLoc StartLoc, SMLoc EndLoc) {
const auto *Val = MCSymbolRefExpr::create(Sym, getContext());
Operands.push_back(std::make_unique<WebAssemblyOperand>(
WebAssemblyOperand::Symbol, StartLoc, EndLoc,
WebAssemblyOperand::SymOp{Val}));
return false;
}
bool addFunctionTableOperand(OperandVector &Operands, StringRef TableName,
SMLoc StartLoc, SMLoc EndLoc) {
return addFunctionTableOperand(
Operands, GetOrCreateFunctionTableSymbol(getContext(), TableName),
StartLoc, EndLoc);
}
bool addDefaultFunctionTableOperand(OperandVector &Operands, SMLoc StartLoc,
SMLoc EndLoc) {
if (STI->checkFeatures("+reference-types")) {
return addFunctionTableOperand(Operands, DefaultFunctionTable, StartLoc,
EndLoc);
} else {
// For the MVP there is at most one table whose number is 0, but we can't
// write a table symbol or issue relocations. Instead we just ensure the
// table is live and write a zero.
getStreamer().emitSymbolAttribute(DefaultFunctionTable, MCSA_NoDeadStrip);
Operands.push_back(std::make_unique<WebAssemblyOperand>(
WebAssemblyOperand::Integer, StartLoc, EndLoc,
WebAssemblyOperand::IntOp{0}));
return false;
}
}
bool ParseInstruction(ParseInstructionInfo & /*Info*/, StringRef Name,
SMLoc NameLoc, OperandVector &Operands) override {
// Note: Name does NOT point into the sourcecode, but to a local, so
@ -516,6 +556,7 @@ public:
bool ExpectBlockType = false;
bool ExpectFuncType = false;
bool ExpectHeapType = false;
bool ExpectFunctionTable = false;
if (Name == "block") {
push(Block);
ExpectBlockType = true;
@ -562,15 +603,7 @@ public:
return true;
} else if (Name == "call_indirect" || Name == "return_call_indirect") {
ExpectFuncType = true;
// Ensure that the object file has a __indirect_function_table import, as
// we call_indirect against it.
auto &Ctx = getStreamer().getContext();
MCSymbolWasm *Sym =
GetOrCreateFunctionTableSymbol(Ctx, "__indirect_function_table");
// Until call_indirect emits TABLE_NUMBER relocs against this symbol, mark
// it as NO_STRIP so as to ensure that the indirect function table makes
// it to linked output.
Sym->setNoStrip();
ExpectFunctionTable = true;
} else if (Name == "ref.null") {
ExpectHeapType = true;
}
@ -586,7 +619,7 @@ public:
return true;
// Got signature as block type, don't need more
ExpectBlockType = false;
auto &Ctx = getStreamer().getContext();
auto &Ctx = getContext();
// The "true" here will cause this to be a nameless symbol.
MCSymbol *Sym = Ctx.createTempSymbol("typeindex", true);
auto *WasmSym = cast<MCSymbolWasm>(Sym);
@ -598,6 +631,16 @@ public:
Operands.push_back(std::make_unique<WebAssemblyOperand>(
WebAssemblyOperand::Symbol, Loc.getLoc(), Loc.getEndLoc(),
WebAssemblyOperand::SymOp{Expr}));
// Allow additional operands after the signature, notably for
// call_indirect against a named table.
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (expect(AsmToken::Comma, ","))
return true;
if (Lexer.is(AsmToken::EndOfStatement)) {
return error("Unexpected trailing comma");
}
}
}
while (Lexer.isNot(AsmToken::EndOfStatement)) {
@ -623,6 +666,11 @@ public:
WebAssemblyOperand::Integer, Id.getLoc(), Id.getEndLoc(),
WebAssemblyOperand::IntOp{static_cast<int64_t>(HeapType)}));
Parser.Lex();
} else if (ExpectFunctionTable) {
if (addFunctionTableOperand(Operands, Id.getString(), Id.getLoc(),
Id.getEndLoc()))
return true;
Parser.Lex();
} else {
// Assume this identifier is a label.
const MCExpr *Val;
@ -689,6 +737,12 @@ public:
// Support blocks with no operands as default to void.
addBlockTypeOperand(Operands, NameLoc, WebAssembly::BlockType::Void);
}
if (ExpectFunctionTable && Operands.size() == 2) {
// If call_indirect doesn't specify a target table, supply one.
if (addDefaultFunctionTableOperand(Operands, NameLoc,
SMLoc::getFromPointer(Name.end())))
return true;
}
Parser.Lex();
return false;
}

2
lib/Target/WebAssembly/MCTargetDesc/WebAssemblyInstPrinter.cpp
View File

@ -68,7 +68,7 @@ void WebAssemblyInstPrinter::printInst(const MCInst *MI, uint64_t Address,
for (auto I = Start, E = MI->getNumOperands(); I < E; ++I) {
if (MI->getOpcode() == WebAssembly::CALL_INDIRECT &&
I - Start == NumVariadicDefs) {
// Skip type and flags arguments when printing for tests
// Skip type and table arguments when printing for tests.
++I;
continue;
}

21
lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
View File

@ -23,6 +23,7 @@
#include "WebAssemblyMachineFunctionInfo.h"
#include "WebAssemblyRegisterInfo.h"
#include "WebAssemblyTargetMachine.h"
#include "WebAssemblyUtilities.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/BinaryFormat/Wasm.h"
@ -171,19 +172,25 @@ MCSymbolWasm *WebAssemblyAsmPrinter::getMCSymbolForFunction(
void WebAssemblyAsmPrinter::emitEndOfAsmFile(Module &M) {
for (auto &It : OutContext.getSymbols()) {
// Emit a .globaltype and .eventtype declaration.
// Emit .globaltype, .eventtype, or .tabletype declarations.
auto Sym = cast<MCSymbolWasm>(It.getValue());
if (Sym->getType() == wasm::WASM_SYMBOL_TYPE_GLOBAL)
getTargetStreamer()->emitGlobalType(Sym);
else if (Sym->getType() == wasm::WASM_SYMBOL_TYPE_EVENT)
getTargetStreamer()->emitEventType(Sym);
else if (Sym->getType() == wasm::WASM_SYMBOL_TYPE_TABLE)
getTargetStreamer()->emitTableType(Sym);
}
DenseSet<MCSymbol *> InvokeSymbols;
bool HasAddressTakenFunction = false;
for (const auto &F : M) {
if (F.isIntrinsic())
continue;
if (F.hasAddressTaken())
HasAddressTakenFunction = true;
// Emit function type info for all undefined functions
if (F.isDeclarationForLinker()) {
SmallVector<MVT, 4> Results;
@ -242,6 +249,18 @@ void WebAssemblyAsmPrinter::emitEndOfAsmFile(Module &M) {
}
}
// When a function's address is taken, a TABLE_INDEX relocation is emitted
// against the function symbol at the use site. However the relocation
// doesn't explicitly refer to the table. In the future we may want to
// define a new kind of reloc against both the function and the table, so
// that the linker can see that the function symbol keeps the table alive,
// but for now manually mark the table as live.
if (HasAddressTakenFunction) {
MCSymbolWasm *FunctionTable =
WebAssembly::getOrCreateFunctionTableSymbol(OutContext, Subtarget);
OutStreamer->emitSymbolAttribute(FunctionTable, MCSA_NoDeadStrip);
}
for (const auto &G : M.globals()) {
if (!G.hasInitializer() && G.hasExternalLinkage()) {
if (G.getValueType()->isSized()) {

25
lib/Target/WebAssembly/WebAssemblyFastISel.cpp
View File

@ -869,19 +869,20 @@ bool WebAssemblyFastISel::selectCall(const Instruction *I) {
if (IsDirect) {
MIB.addGlobalAddress(Func);
} else {
// Add placeholders for the type index and immediate flags
// Placehoder for the type index.
MIB.addImm(0);
MIB.addImm(0);
// Ensure that the object file has a __indirect_function_table import, as we
// call_indirect against it.
MCSymbolWasm *Sym = WebAssembly::getOrCreateFunctionTableSymbol(
MF->getMMI().getContext(), "__indirect_function_table");
// Until call_indirect emits TABLE_NUMBER relocs against this symbol, mark
// it as NO_STRIP so as to ensure that the indirect function table makes it
// to linked output.
Sym->setNoStrip();
// The table into which this call_indirect indexes.
MCSymbolWasm *Table = WebAssembly::getOrCreateFunctionTableSymbol(
MF->getMMI().getContext(), Subtarget);
if (Subtarget->hasReferenceTypes()) {
MIB.addSym(Table);
} else {
// Otherwise for the MVP there is at most one table whose number is 0, but
// we can't write a table symbol or issue relocations. Instead we just
// ensure the table is live.
Table->setNoStrip();
MIB.addImm(0);
}
// See if we must truncate the function pointer.
// CALL_INDIRECT takes an i32, but in wasm64 we represent function pointers
// as 64-bit for uniformity with other pointer types.

33
lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
View File

@ -426,9 +426,10 @@ static MachineBasicBlock *LowerFPToInt(MachineInstr &MI, DebugLoc DL,
return DoneMBB;
}
static MachineBasicBlock *LowerCallResults(MachineInstr &CallResults,
DebugLoc DL, MachineBasicBlock *BB,
const TargetInstrInfo &TII) {
static MachineBasicBlock *
LowerCallResults(MachineInstr &CallResults, DebugLoc DL, MachineBasicBlock *BB,
const WebAssemblySubtarget *Subtarget,
const TargetInstrInfo &TII) {
MachineInstr &CallParams = *CallResults.getPrevNode();
assert(CallParams.getOpcode() == WebAssembly::CALL_PARAMS);
assert(CallResults.getOpcode() == WebAssembly::CALL_RESULTS ||
@ -476,19 +477,21 @@ static MachineBasicBlock *LowerCallResults(MachineInstr &CallResults,
for (auto Def : CallResults.defs())
MIB.add(Def);
// Add placeholders for the type index and immediate flags
if (IsIndirect) {
// Placeholder for the type index.
MIB.addImm(0);
MIB.addImm(0);
// Ensure that the object file has a __indirect_function_table import, as we
// call_indirect against it.
MCSymbolWasm *Sym = WebAssembly::getOrCreateFunctionTableSymbol(
MF.getContext(), "__indirect_function_table");
// Until call_indirect emits TABLE_NUMBER relocs against this symbol, mark
// it as NO_STRIP so as to ensure that the indirect function table makes it
// to linked output.
Sym->setNoStrip();
// The table into which this call_indirect indexes.
MCSymbolWasm *Table =
WebAssembly::getOrCreateFunctionTableSymbol(MF.getContext(), Subtarget);
if (Subtarget->hasReferenceTypes()) {
MIB.addSym(Table);
} else {
// For the MVP there is at most one table whose number is 0, but we can't
// write a table symbol or issue relocations. Instead we just ensure the
// table is live and write a zero.
Table->setNoStrip();
MIB.addImm(0);
}
}
for (auto Use : CallParams.uses())
@ -535,7 +538,7 @@ MachineBasicBlock *WebAssemblyTargetLowering::EmitInstrWithCustomInserter(
WebAssembly::I64_TRUNC_U_F64);
case WebAssembly::CALL_RESULTS:
case WebAssembly::RET_CALL_RESULTS:
return LowerCallResults(MI, DL, BB, TII);
return LowerCallResults(MI, DL, BB, Subtarget, TII);
}
}

18
lib/Target/WebAssembly/WebAssemblyInstrCall.td
View File

@ -48,6 +48,9 @@ defm RET_CALL_RESULTS :
I<(outs), (ins variable_ops), (outs), (ins), [],
"return_call_results", "return_call_results", -1>;
// Note that instructions with variable_ops have custom printers in
// WebAssemblyInstPrinter.cpp.
let variadicOpsAreDefs = 1 in
defm CALL :
I<(outs), (ins function32_op:$callee, variable_ops),
@ -56,9 +59,12 @@ defm CALL :
let variadicOpsAreDefs = 1 in
defm CALL_INDIRECT :
I<(outs), (ins TypeIndex:$type, i32imm:$flags, variable_ops),
(outs), (ins TypeIndex:$type, i32imm:$flags), [],
"call_indirect", "call_indirect\t$type", 0x11>;
I<(outs),
(ins TypeIndex:$type, table32_op:$table, variable_ops),
(outs),
(ins TypeIndex:$type, table32_op:$table),
[],
"call_indirect", "call_indirect\t$type, $table", 0x11>;
let isReturn = 1, isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in
defm RET_CALL :
@ -69,9 +75,9 @@ defm RET_CALL :
let isReturn = 1 in
defm RET_CALL_INDIRECT :
I<(outs), (ins TypeIndex:$type, i32imm:$flags, variable_ops),
(outs), (ins TypeIndex:$type, i32imm:$flags), [],
"return_call_indirect\t", "return_call_indirect\t$type",
I<(outs), (ins TypeIndex:$type, table32_op:$table, variable_ops),
(outs), (ins TypeIndex:$type, table32_op:$table), [],
"return_call_indirect\t", "return_call_indirect\t$type, $table",
0x13>,
Requires<[HasTailCall]>;

2
lib/Target/WebAssembly/WebAssemblyMCInstLower.cpp
View File

@ -161,6 +161,8 @@ MCOperand WebAssemblyMCInstLower::lowerSymbolOperand(const MachineOperand &MO,
report_fatal_error("Global indexes with offsets not supported");
if (WasmSym->isEvent())
report_fatal_error("Event indexes with offsets not supported");
if (WasmSym->isTable())
report_fatal_error("Table indexes with offsets not supported");
Expr = MCBinaryExpr::createAdd(
Expr, MCConstantExpr::create(MO.getOffset(), Ctx), Ctx);

11
lib/Target/WebAssembly/WebAssemblyUtilities.cpp
View File

@ -98,11 +98,9 @@ const MachineOperand &WebAssembly::getCalleeOp(const MachineInstr &MI) {
}
}
MCSymbolWasm *
WebAssembly::getOrCreateFunctionTableSymbol(MCContext &Ctx,
const StringRef &Name) {
// FIXME: Duplicates functionality from
// MC/WasmObjectWriter::recordRelocation.
MCSymbolWasm *WebAssembly::getOrCreateFunctionTableSymbol(
MCContext &Ctx, const WebAssemblySubtarget *Subtarget) {
StringRef Name = "__indirect_function_table";
MCSymbolWasm *Sym = cast_or_null<MCSymbolWasm>(Ctx.lookupSymbol(Name));
if (Sym) {
if (!Sym->isFunctionTable())
@ -113,6 +111,9 @@ WebAssembly::getOrCreateFunctionTableSymbol(MCContext &Ctx,
// The default function table is synthesized by the linker.
Sym->setUndefined();
}
// MVP object files can't have symtab entries for tables.
if (!(Subtarget && Subtarget->hasReferenceTypes()))
Sym->setOmitFromLinkingSection();
return Sym;
}

10
lib/Target/WebAssembly/WebAssemblyUtilities.h
View File

@ -24,6 +24,7 @@ class MCContext;
class MCSymbolWasm;
class StringRef;
class WebAssemblyFunctionInfo;
class WebAssemblySubtarget;
namespace WebAssembly {
@ -41,10 +42,11 @@ extern const char *const PersonalityWrapperFn;
/// instruction.
const MachineOperand &getCalleeOp(const MachineInstr &MI);
/// Returns the operand number of a callee, assuming the argument is a call
/// instruction.
MCSymbolWasm *getOrCreateFunctionTableSymbol(MCContext &Ctx,
const StringRef &Name);
/// Returns the __indirect_function_table, for use in call_indirect and in
/// function bitcasts.
MCSymbolWasm *
getOrCreateFunctionTableSymbol(MCContext &Ctx,
const WebAssemblySubtarget *Subtarget);
/// Find a catch instruction from an EH pad. Returns null if no catch
/// instruction found or the catch is in an invalid location.

10
test/CodeGen/WebAssembly/function-pointer64.ll
View File

@ -1,4 +1,5 @@
; RUN: llc < %s -asm-verbose=false -O2 | FileCheck %s
; RUN: llc < %s -asm-verbose=false -mattr=+reference-types -O2 | FileCheck --check-prefix=REF %s
; RUN: llc < %s -asm-verbose=false -O2 --filetype=obj | obj2yaml | FileCheck --check-prefix=YAML %s
; This tests pointer features that may codegen differently in wasm64.
@ -34,14 +35,16 @@ entry:
; CHECK-NEXT: i32.const 1
; CHECK-NEXT: local.get 0
; CHECK-NEXT: i32.wrap_i64
; CHECK-NEXT: call_indirect (i32) -> ()
; CHECK-NEXT: call_indirect (i32) -> (), 0
; REF: call_indirect (i32) -> (), __indirect_function_table
; CHECK: .functype test () -> ()
; CHECK-NEXT: i64.const bar
; CHECK-NEXT: call foo
; Check we're emitting a 64-bit reloc for `i64.const bar` and the global.
; Check we're emitting a 64-bit relocs for the call_indirect, the
; `i64.const bar` reference in code, and the global.
; YAML: Memory:
; YAML-NEXT: Flags: [ IS_64 ]
@ -51,6 +54,9 @@ entry:
; YAML: - Type: R_WASM_TABLE_INDEX_SLEB64
; YAML-NEXT: Index: 0
; YAML-NEXT: Offset: 0x16
; YAML: - Type: R_WASM_TABLE_INDEX_SLEB64
; YAML-NEXT: Index: 0
; YAML-NEXT: Offset: 0x29
; YAML: - Type: DATA
; YAML: - Type: R_WASM_TABLE_INDEX_I64

4
test/CodeGen/WebAssembly/multivalue.ll
View File

@ -1,4 +1,5 @@
; RUN: llc < %s -asm-verbose=false -verify-machineinstrs -mattr=+multivalue,+tail-call | FileCheck %s
; RUN: llc < %s -asm-verbose=false -verify-machineinstrs -mattr=+reference-types,+multivalue,+tail-call | FileCheck --check-prefix REF %s
; RUN: llc < %s -asm-verbose=false -verify-machineinstrs -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -mattr=+multivalue,+tail-call | FileCheck %s --check-prefix REGS
; RUN: llc < %s --filetype=obj -mattr=+multivalue,+tail-call | obj2yaml | FileCheck %s --check-prefix OBJ
@ -57,7 +58,8 @@ define %pair @pair_call_return() {
; CHECK-LABEL: pair_call_indirect:
; CHECK-NEXT: .functype pair_call_indirect (i32) -> (i32, i64)
; CHECK-NEXT: local.get 0{{$}}
; CHECK-NEXT: call_indirect () -> (i32, i64){{$}}
; CHECK-NEXT: call_indirect () -> (i32, i64), 0{{$}}
; REF: call_indirect () -> (i32, i64), __indirect_function_table{{$}}
; CHECK-NEXT: end_function{{$}}
; REGS: call_indirect $push{{[0-9]+}}=, $push{{[0-9]+}}=, $0{{$}}
define %pair @pair_call_indirect(%pair()* %f) {

6
test/MC/WebAssembly/basic-assembly.s
View File

@ -1,6 +1,6 @@
# RUN: llvm-mc -triple=wasm32-unknown-unknown -mattr=+atomics,+unimplemented-simd128,+nontrapping-fptoint,+exception-handling < %s | FileCheck %s
# RUN: llvm-mc -triple=wasm32-unknown-unknown -mattr=+reference-types,atomics,+unimplemented-simd128,+nontrapping-fptoint,+exception-handling < %s | FileCheck %s
# Check that it converts to .o without errors, but don't check any output:
# RUN: llvm-mc -triple=wasm32-unknown-unknown -filetype=obj -mattr=+atomics,+unimplemented-simd128,+nontrapping-fptoint,+exception-handling -o %t.o < %s
# RUN: llvm-mc -triple=wasm32-unknown-unknown -filetype=obj -mattr=+reference-types,+atomics,+unimplemented-simd128,+nontrapping-fptoint,+exception-handling -o %t.o < %s
empty_func:
@ -156,7 +156,7 @@ empty_fref_table:
# CHECK-NEXT: i64.const 1234
# CHECK-NEXT: call something2
# CHECK-NEXT: i32.const 0
# CHECK-NEXT: call_indirect (i32, f64) -> ()
# CHECK-NEXT: call_indirect (i32, f64) -> (), __indirect_function_table
# CHECK-NEXT: i32.const 1
# CHECK-NEXT: i32.add
# CHECK-NEXT: local.tee 0

83
test/MC/WebAssembly/call-indirect-relocs.s Normal file
View File

@ -0,0 +1,83 @@
# RUN: llvm-mc -triple=wasm32-unknown-unknown -mattr=+reference-types < %s | FileCheck --check-prefix=CHECK %s
# RUN: llvm-mc -triple=wasm32-unknown-unknown -mattr=+reference-types -filetype=obj < %s | obj2yaml | FileCheck -check-prefix=BIN %s
test0:
.functype test0 () -> ()
i32.const 42
f64.const 2.5
i32.const 0
call_indirect (i32, f64) -> (), empty_fref_table
end_function
.tabletype empty_fref_table, funcref
empty_fref_table:
# CHECK: .text
# CHECK-LABEL: test0:
# CHECK-NEXT: .functype test0 () -> ()
# CHECK-NEXT: i32.const 42
# CHECK-NEXT: f64.const 0x1.4p1
# CHECK-NEXT: i32.const 0
# CHECK-NEXT: call_indirect (i32, f64) -> (), empty_fref_table
# CHECK-NEXT: end_function
# CHECK: .tabletype empty_fref_table, funcref
# CHECK: empty_fref_table:
# BIN: --- !WASM
# BIN-NEXT: FileHeader:
# BIN-NEXT: Version: 0x1
# BIN-NEXT: Sections:
# BIN-NEXT: - Type: TYPE
# BIN-NEXT: Signatures:
# BIN-NEXT: - Index: 0
# BIN-NEXT: ParamTypes: []
# BIN-NEXT: ReturnTypes: []
# BIN-NEXT: - Index: 1
# BIN-NEXT: ParamTypes:
# BIN-NEXT: - I32
# BIN-NEXT: - F64
# BIN-NEXT: ReturnTypes: []
# BIN-NEXT: - Type: IMPORT
# BIN-NEXT: Imports:
# BIN-NEXT: - Module: env
# BIN-NEXT: Field: __linear_memory
# BIN-NEXT: Kind: MEMORY
# BIN-NEXT: Memory:
# BIN-NEXT: Initial: 0x0
# BIN-NEXT: - Type: FUNCTION
# BIN-NEXT: FunctionTypes: [ 0 ]
# BIN-NEXT: - Type: TABLE
# BIN-NEXT: Tables:
# BIN-NEXT: - Index: 0
# BIN-NEXT: ElemType: FUNCREF
# BIN-NEXT: Limits:
# BIN-NEXT: Initial: 0x0
# BIN-NEXT: - Type: CODE
# BIN-NEXT: Relocations:
# BIN-NEXT: - Type: R_WASM_TYPE_INDEX_LEB
# BIN-NEXT: Index: 1
# BIN-NEXT: Offset: 0x11
# BIN-NEXT: - Type: R_WASM_TABLE_NUMBER_LEB
# BIN-NEXT: Index: 1
# BIN-NEXT: Offset: 0x16
# BIN-NEXT: Functions:
# BIN-NEXT: - Index: 0
# BIN-NEXT: Locals: []
# BIN-NEXT: Body: 412A440000000000000440410011818080800080808080000B
# BIN-NEXT: - Type: CUSTOM
# BIN-NEXT: Name: linking
# BIN-NEXT: Version: 2
# BIN-NEXT: SymbolTable:
# BIN-NEXT: - Index: 0
# BIN-NEXT: Kind: FUNCTION
# BIN-NEXT: Name: test0
# BIN-NEXT: Flags: [ BINDING_LOCAL ]
# BIN-NEXT: Function: 0
# BIN-NEXT: - Index: 1
# BIN-NEXT: Kind: TABLE
# BIN-NEXT: Name: empty_fref_table
# BIN-NEXT: Flags: [ BINDING_LOCAL ]
# BIN-NEXT: Table: 0
# BIN-NEXT: ...

42
test/MC/WebAssembly/function-alias.ll
View File

@ -1,4 +1,5 @@
; RUN: llc -filetype=obj %s -o - | llvm-readobj --symbols - | FileCheck %s
; RUN: llc -filetype=obj %s -mattr=+reference-types -o - | llvm-readobj --symbols - | FileCheck --check-prefix=REF %s
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown-wasm"
@ -42,3 +43,44 @@ define i8* @func() {
; CHECK-NEXT: ElementIndex: 0x0
; CHECK-NEXT: }
; CHECK-NEXT: ]
; REF: Symbols [
; REF-NEXT: Symbol {
; REF-NEXT: Name: func
; REF-NEXT: Type: FUNCTION (0x0)
; REF-NEXT: Flags [ (0x0)
; REF-NEXT: ]
; REF-NEXT: ElementIndex: 0x0
; REF-NEXT: }
; REF-NEXT: Symbol {
; REF-NEXT: Name: bar2
; REF-NEXT: Type: FUNCTION (0x0)
; REF-NEXT: Flags [ (0x0)
; REF-NEXT: ]
; REF-NEXT: ElementIndex: 0x0
; REF-NEXT: }
; REF-NEXT: Symbol {
; REF-NEXT: Name: foo
; REF-NEXT: Type: FUNCTION (0x0)
; REF-NEXT: Flags [ (0x0)
; REF-NEXT: ]
; REF-NEXT: ElementIndex: 0x0
; REF-NEXT: }
; REF-NEXT: Symbol {
; REF-NEXT: Name: bar
; REF-NEXT: Type: FUNCTION (0x0)
; REF-NEXT: Flags [ (0x0)
; REF-NEXT: ]
; REF-NEXT: ElementIndex: 0x0
; REF-NEXT: }
; REF-NEXT: Symbol {
; REF-NEXT: Name: __indirect_function_table
; REF-NEXT: Type: TABLE (0x5)
; REF-NEXT: Flags [ (0x90)
; REF-NEXT: NO_STRIP (0x80)
; REF-NEXT: UNDEFINED (0x10)
; REF-NEXT: ]
; REF-NEXT: ImportModule: env
; REF-NEXT: ElementIndex: 0x0
; REF-NEXT: }
; REF-NEXT: ]

49
test/MC/WebAssembly/reloc-code.ll
View File

@ -1,4 +1,5 @@
; RUN: llc -filetype=obj %s -o - | llvm-readobj -r --expand-relocs - | FileCheck %s
; RUN: llc -filetype=obj -mattr=+reference-types %s -o - | llvm-readobj -r --expand-relocs - | FileCheck --check-prefix=REF %s
target triple = "wasm32-unknown-unknown"
@ -59,3 +60,51 @@ entry:
; CHECK-NEXT: }
; CHECK-NEXT: }
; CHECK-NEXT: ]
; REF: Format: WASM
; REF: Relocations [
; REF-NEXT: Section (5) CODE {
; REF-NEXT: Relocation {
; REF-NEXT: Type: R_WASM_MEMORY_ADDR_LEB (3)
; REF-NEXT: Offset: 0x9
; REF-NEXT: Symbol: b
; REF-NEXT: Addend: 0
; REF-NEXT: }
; REF-NEXT: Relocation {
; REF-NEXT: Type: R_WASM_MEMORY_ADDR_LEB (3)
; REF-NEXT: Offset: 0x14
; REF-NEXT: Symbol: a
; REF-NEXT: Addend: 0
; REF-NEXT: }
; REF-NEXT: Relocation {
; REF-NEXT: Type: R_WASM_TYPE_INDEX_LEB (6)
; REF-NEXT: Offset: 0x1A
; REF-NEXT: Index: 0x1
; REF-NEXT: }
; REF-NEXT: Relocation {
; REF-NEXT: Type: R_WASM_TABLE_NUMBER_LEB (20)
; REF-NEXT: Offset: 0x1F
; REF-NEXT: Symbol: __indirect_function_table
; REF-NEXT: }
; REF-NEXT: Relocation {
; REF-NEXT: Type: R_WASM_TYPE_INDEX_LEB (6)
; REF-NEXT: Offset: 0x28
; REF-NEXT: Index: 0x0
; REF-NEXT: }
; REF-NEXT: Relocation {
; REF-NEXT: Type: R_WASM_TABLE_NUMBER_LEB (20)
; REF-NEXT: Offset: 0x2D
; REF-NEXT: Symbol: __indirect_function_table
; REF-NEXT: }
; REF-NEXT: Relocation {
; REF-NEXT: Type: R_WASM_FUNCTION_INDEX_LEB (0)
; REF-NEXT: Offset: 0x35
; REF-NEXT: Symbol: c
; REF-NEXT: }
; REF-NEXT: Relocation {
; REF-NEXT: Type: R_WASM_FUNCTION_INDEX_LEB (0)
; REF-NEXT: Offset: 0x3C
; REF-NEXT: Symbol: d
; REF-NEXT: }
; REF-NEXT: }
; REF-NEXT: ]

6
test/MC/WebAssembly/reloc-pic.s
View File

@ -1,4 +1,5 @@
# RUN: llvm-mc -triple=wasm32-unknown-unknown -filetype=obj < %s | obj2yaml | FileCheck %s
# RUN: llvm-mc -triple=wasm32-unknown-unknown -mattr=+reference-types -filetype=obj < %s | obj2yaml | FileCheck --check-prefix=REF %s
# Verify that @GOT relocation entryes result in R_WASM_GLOBAL_INDEX_LEB against
# against the corrsponding function or data symbol and that the corresponding
@ -190,6 +191,11 @@ hidden_func:
# CHECK-NEXT: Name: hidden_func
# CHECK-NEXT: Flags: [ BINDING_LOCAL ]
# CHECK-NEXT: Function: 5
# REF: - Index: 10
# REF-NEXT: Kind: TABLE
# REF-NEXT: Name: __indirect_function_table
# REF-NEXT: Flags: [ UNDEFINED, NO_STRIP ]
# REF-NEXT: Table: 0
# CHECK-NEXT: SegmentInfo:
# CHECK-NEXT: - Index: 0
# CHECK-NEXT: Name: .rodata.hidden_data

4
test/MC/WebAssembly/tail-call-encodings.s
View File

@ -1,4 +1,5 @@
# RUN: llvm-mc -show-encoding -triple=wasm32-unknown-unknown -mattr=+tail-call < %s | FileCheck %s
# RUN: llvm-mc -show-encoding -triple=wasm32-unknown-unknown -mattr=+reference-types,+tail-call < %s | FileCheck --check-prefix=REF %s
bar1:
.functype bar1 () -> ()
@ -16,7 +17,8 @@ foo1:
foo2:
.functype foo2 () -> ()
# CHECK: return_call_indirect (i32) -> (i32) # encoding: [0x13,
# REF: return_call_indirect (i32) -> (i32), __indirect_function_table # encoding: [0x13,
# CHECK: return_call_indirect (i32) -> (i32), 0 # encoding: [0x13,
# CHECK-NEXT: fixup A - offset: 1, value: .Ltypeindex0@TYPEINDEX, kind: fixup_uleb128_i32
return_call_indirect (i32) -> (i32)

16
test/MC/WebAssembly/type-index.s
View File

@ -1,8 +1,8 @@
# RUN: llvm-mc -triple=wasm32-unknown-unknown -mattr=+unimplemented-simd128,+nontrapping-fptoint,+exception-handling < %s | FileCheck %s
# RUN: llvm-mc -triple=wasm32-unknown-unknown -mattr=+reference-types,+unimplemented-simd128,+nontrapping-fptoint,+exception-handling < %s | FileCheck %s
# Check that it converts to .o without errors:
# RUN: llvm-mc -triple=wasm32-unknown-unknown -filetype=obj -mattr=+unimplemented-simd128,+nontrapping-fptoint,+exception-handling < %s | obj2yaml | FileCheck -check-prefix=BIN %s
# RUN: llvm-mc -triple=wasm32-unknown-unknown -filetype=obj -mattr=+reference-types,+unimplemented-simd128,+nontrapping-fptoint,+exception-handling < %s | obj2yaml | FileCheck -check-prefix=BIN %s
# Minimal test for type indices in call_indirect.
# Minimal test for type indices and table references in call_indirect.
test0:
.functype test0 (i32) -> (i32)
@ -53,10 +53,13 @@ test0:
# BIN-NEXT: - Type: R_WASM_TYPE_INDEX_LEB
# BIN-NEXT: Index: 1
# BIN-NEXT: Offset: 0x4
# BIN-NEXT: - Type: R_WASM_TABLE_NUMBER_LEB
# BIN-NEXT: Index: 1
# BIN-NEXT: Offset: 0x9
# BIN-NEXT: Functions:
# BIN-NEXT: - Index: 0
# BIN-NEXT: Locals: []
# BIN-NEXT: Body: 118180808000000B
# BIN-NEXT: Body: 11818080800080808080000B
# BIN-NEXT: - Type: CUSTOM
# BIN-NEXT: Name: linking
# BIN-NEXT: Version: 2
@ -66,4 +69,9 @@ test0:
# BIN-NEXT: Name: test0
# BIN-NEXT: Flags: [ BINDING_LOCAL ]
# BIN-NEXT: Function: 0
# BIN-NEXT: - Index: 1
# BIN-NEXT: Kind: TABLE
# BIN-NEXT: Name: __indirect_function_table
# BIN-NEXT: Flags: [ UNDEFINED ]
# BIN-NEXT: Table: 0
# BIN-NEXT: ...

200
test/MC/WebAssembly/weak-alias.s
View File

@ -1,5 +1,5 @@
# RUN: llvm-mc -triple=wasm32-unknown-unknown -filetype=obj -o %t.o < %s
# RUN: obj2yaml %t.o | FileCheck %s
# RUN: llvm-mc -triple=wasm32-unknown-unknown -filetype=obj < %s | obj2yaml | FileCheck --check-prefix=CHECK %s
# RUN: llvm-mc -triple=wasm32-unknown-unknown -mattr=+reference-types -filetype=obj < %s | obj2yaml | FileCheck --check-prefix=REF %s
# 'foo_alias()' is weak alias of function 'foo()'
# 'bar_alias' is weak alias of global variable 'bar'
@ -78,7 +78,7 @@ alias_address:
# CHECK: - Type: TYPE
# CHECK-NEXT: Signatures:
# CHECK-NEXT: - Index: 0
# CHECK-NEXT: ParamTypes:
# CHECK-NEXT: ParamTypes: []
# CHECK-NEXT: ReturnTypes:
# CHECK-NEXT: - I32
# CHECK-NEXT: - Type: IMPORT
@ -128,19 +128,19 @@ alias_address:
# CHECK-NEXT: Offset: 0x37
# CHECK-NEXT: Functions:
# CHECK-NEXT: - Index: 0
# CHECK-NEXT: Locals:
# CHECK-NEXT: Locals: []
# CHECK-NEXT: Body: 41000B
# CHECK-NEXT: - Index: 1
# CHECK-NEXT: Locals:
# CHECK-NEXT: Locals: []
# CHECK-NEXT: Body: 1080808080000B
# CHECK-NEXT: - Index: 2
# CHECK-NEXT: Locals:
# CHECK-NEXT: Locals: []
# CHECK-NEXT: Body: 1080808080000B
# CHECK-NEXT: - Index: 3
# CHECK-NEXT: Locals:
# CHECK-NEXT: Locals: []
# CHECK-NEXT: Body: 410028028880808000118080808000000B
# CHECK-NEXT: - Index: 4
# CHECK-NEXT: Locals:
# CHECK-NEXT: Locals: []
# CHECK-NEXT: Body: 410028029080808000118080808000000B
# CHECK-NEXT: - Type: DATA
# CHECK-NEXT: Relocations:
@ -231,17 +231,195 @@ alias_address:
# CHECK-NEXT: - Index: 0
# CHECK-NEXT: Name: .data.bar
# CHECK-NEXT: Alignment: 3
# CHECK-NEXT: Flags: [ ]
# CHECK-NEXT: Flags: [ ]
# CHECK-NEXT: - Index: 1
# CHECK-NEXT: Name: .data.direct_address
# CHECK-NEXT: Alignment: 3
# CHECK-NEXT: Flags: [ ]
# CHECK-NEXT: Flags: [ ]
# CHECK-NEXT: - Index: 2
# CHECK-NEXT: Name: .data.alias_address
# CHECK-NEXT: Alignment: 3
# CHECK-NEXT: Flags: [ ]
# CHECK-NEXT: Flags: [ ]
# CHECK-NEXT: ...
# REF: - Type: TYPE
# REF-NEXT: Signatures:
# REF-NEXT: - Index: 0
# REF-NEXT: ParamTypes: []
# REF-NEXT: ReturnTypes:
# REF-NEXT: - I32
# REF-NEXT: - Type: IMPORT
# REF-NEXT: Imports:
# REF-NEXT: - Module: env
# REF-NEXT: Field: __linear_memory
# REF-NEXT: Kind: MEMORY
# REF-NEXT: Memory:
# REF-NEXT: Initial: 0x1
# REF-NEXT: - Module: env
# REF-NEXT: Field: __indirect_function_table
# REF-NEXT: Kind: TABLE
# REF-NEXT: Table:
# REF-NEXT: Index: 0
# REF-NEXT: ElemType: FUNCREF
# REF-NEXT: Limits:
# REF-NEXT: Initial: 0x1
# REF-NEXT: - Type: FUNCTION
# REF-NEXT: FunctionTypes: [ 0, 0, 0, 0, 0 ]
# REF-NEXT: - Type: ELEM
# REF-NEXT: Segments:
# REF-NEXT: - Offset:
# REF-NEXT: Opcode: I32_CONST
# REF-NEXT: Value: 1
# REF-NEXT: Functions: [ 0 ]
# REF-NEXT: - Type: DATACOUNT
# REF-NEXT: Count: 3
# REF-NEXT: - Type: CODE
# REF-NEXT: Relocations:
# REF-NEXT: - Type: R_WASM_FUNCTION_INDEX_LEB
# REF-NEXT: Index: 0
# REF-NEXT: Offset: 0x9
# REF-NEXT: - Type: R_WASM_FUNCTION_INDEX_LEB
# REF-NEXT: Index: 3
# REF-NEXT: Offset: 0x12
# REF-NEXT: - Type: R_WASM_MEMORY_ADDR_LEB
# REF-NEXT: Index: 5
# REF-NEXT: Offset: 0x1E
# REF-NEXT: - Type: R_WASM_TYPE_INDEX_LEB
# REF-NEXT: Index: 0
# REF-NEXT: Offset: 0x24
# REF-NEXT: - Type: R_WASM_TABLE_NUMBER_LEB
# REF-NEXT: Index: 6
# REF-NEXT: Offset: 0x29
# REF-NEXT: - Type: R_WASM_MEMORY_ADDR_LEB
# REF-NEXT: Index: 8
# REF-NEXT: Offset: 0x35
# REF-NEXT: - Type: R_WASM_TYPE_INDEX_LEB
# REF-NEXT: Index: 0
# REF-NEXT: Offset: 0x3B
# REF-NEXT: - Type: R_WASM_TABLE_NUMBER_LEB
# REF-NEXT: Index: 6
# REF-NEXT: Offset: 0x40
# REF-NEXT: Functions:
# REF-NEXT: - Index: 0
# REF-NEXT: Locals: []
# REF-NEXT: Body: 41000B
# REF-NEXT: - Index: 1
# REF-NEXT: Locals: []
# REF-NEXT: Body: 1080808080000B
# REF-NEXT: - Index: 2
# REF-NEXT: Locals: []
# REF-NEXT: Body: 1080808080000B
# REF-NEXT: - Index: 3
# REF-NEXT: Locals: []
# REF-NEXT: Body: 41002802888080800011808080800080808080000B
# REF-NEXT: - Index: 4
# REF-NEXT: Locals: []
# REF-NEXT: Body: 41002802908080800011808080800080808080000B
# REF-NEXT: - Type: DATA
# REF-NEXT: Relocations:
# REF-NEXT: - Type: R_WASM_TABLE_INDEX_I32
# REF-NEXT: Index: 0
# REF-NEXT: Offset: 0x13
# REF-NEXT: - Type: R_WASM_TABLE_INDEX_I32
# REF-NEXT: Index: 3
# REF-NEXT: Offset: 0x20
# REF-NEXT: Segments:
# REF-NEXT: - SectionOffset: 6
# REF-NEXT: InitFlags: 0
# REF-NEXT: Offset:
# REF-NEXT: Opcode: I32_CONST
# REF-NEXT: Value: 0
# REF-NEXT: Content: '0700000000000000'
# REF-NEXT: - SectionOffset: 19
# REF-NEXT: InitFlags: 0
# REF-NEXT: Offset:
# REF-NEXT: Opcode: I32_CONST
# REF-NEXT: Value: 8
# REF-NEXT: Content: '0100000000000000'
# REF-NEXT: - SectionOffset: 32
# REF-NEXT: InitFlags: 0
# REF-NEXT: Offset:
# REF-NEXT: Opcode: I32_CONST
# REF-NEXT: Value: 16
# REF-NEXT: Content: '0100000000000000'
# REF-NEXT: - Type: CUSTOM
# REF-NEXT: Name: linking
# REF-NEXT: Version: 2
# REF-NEXT: SymbolTable:
# REF-NEXT: - Index: 0
# REF-NEXT: Kind: FUNCTION
# REF-NEXT: Name: foo
# REF-NEXT: Flags: [ VISIBILITY_HIDDEN ]
# REF-NEXT: Function: 0
# REF-NEXT: - Index: 1
# REF-NEXT: Kind: FUNCTION
# REF-NEXT: Name: call_direct
# REF-NEXT: Flags: [ VISIBILITY_HIDDEN ]
# REF-NEXT: Function: 1
# REF-NEXT: - Index: 2
# REF-NEXT: Kind: FUNCTION
# REF-NEXT: Name: call_alias
# REF-NEXT: Flags: [ VISIBILITY_HIDDEN ]
# REF-NEXT: Function: 2
# REF-NEXT: - Index: 3
# REF-NEXT: Kind: FUNCTION
# REF-NEXT: Name: foo_alias
# REF-NEXT: Flags: [ BINDING_WEAK, VISIBILITY_HIDDEN, NO_STRIP ]
# REF-NEXT: Function: 0
# REF-NEXT: - Index: 4
# REF-NEXT: Kind: FUNCTION
# REF-NEXT: Name: call_direct_ptr
# REF-NEXT: Flags: [ VISIBILITY_HIDDEN ]
# REF-NEXT: Function: 3
# REF-NEXT: - Index: 5
# REF-NEXT: Kind: DATA
# REF-NEXT: Name: direct_address
# REF-NEXT: Flags: [ ]
# REF-NEXT: Segment: 1
# REF-NEXT: Size: 4
# REF-NEXT: - Index: 6
# REF-NEXT: Kind: TABLE
# REF-NEXT: Name: __indirect_function_table
# REF-NEXT: Flags: [ UNDEFINED, NO_STRIP ]
# REF-NEXT: Table: 0
# REF-NEXT: - Index: 7
# REF-NEXT: Kind: FUNCTION
# REF-NEXT: Name: call_alias_ptr
# REF-NEXT: Flags: [ VISIBILITY_HIDDEN ]
# REF-NEXT: Function: 4
# REF-NEXT: - Index: 8
# REF-NEXT: Kind: DATA
# REF-NEXT: Name: alias_address
# REF-NEXT: Flags: [ ]
# REF-NEXT: Segment: 2
# REF-NEXT: Size: 4
# REF-NEXT: - Index: 9
# REF-NEXT: Kind: DATA
# REF-NEXT: Name: bar
# REF-NEXT: Flags: [ ]
# REF-NEXT: Segment: 0
# REF-NEXT: Size: 4
# REF-NEXT: - Index: 10
# REF-NEXT: Kind: DATA
# REF-NEXT: Name: bar_alias
# REF-NEXT: Flags: [ BINDING_WEAK, VISIBILITY_HIDDEN, NO_STRIP ]
# REF-NEXT: Segment: 0
# REF-NEXT: Size: 4
# REF-NEXT: SegmentInfo:
# REF-NEXT: - Index: 0
# REF-NEXT: Name: .data.bar
# REF-NEXT: Alignment: 3
# REF-NEXT: Flags: [ ]
# REF-NEXT: - Index: 1
# REF-NEXT: Name: .data.direct_address
# REF-NEXT: Alignment: 3
# REF-NEXT: Flags: [ ]
# REF-NEXT: - Index: 2
# REF-NEXT: Name: .data.alias_address
# REF-NEXT: Alignment: 3
# REF-NEXT: Flags: [ ]
# REF-NEXT: ...
# CHECK-SYMS: SYMBOL TABLE:
# CHECK-SYMS-NEXT: 00000001 g F CODE .hidden foo
# CHECK-SYMS-NEXT: 00000006 g F CODE .hidden call_direct