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[WebAssembly] Allow multivalue types in block signature operands

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Summary:
Renames `ExprType` to the more apt `BlockType` and adds a variant for
multivalue blocks. Currently non-void blocks are only generated at the
end of functions where the block return type needs to agree with the
function return type, and that remains true for multivalue
blocks. That invariant means that the actual signature does not need
to be stored in the block signature `MachineOperand` because it can be
inferred by `WebAssemblyMCInstLower` from the return type of the
parent function. `WebAssemblyMCInstLower` continues to lower block
signature operands to immediates when possible but lowers multivalue
signatures to function type symbols. The AsmParser and Disassembler
are updated to handle multivalue block types as well.

Reviewers: aheejin, dschuff, aardappel

Subscribers: sbc100, jgravelle-google, hiraditya, sunfish, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68889

llvm-svn: 374933
This commit is contained in:
Thomas Lively 2019-10-15 18:28:22 +00:00
parent 10ac04de80
commit 5d88a6a71d
15 changed files with 181 additions and 117 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
View File

@ -313,16 +313,17 @@ public:
return Optional<wasm::ValType>();
}
WebAssembly::ExprType parseBlockType(StringRef ID) {
return StringSwitch<WebAssembly::ExprType>(ID)
.Case("i32", WebAssembly::ExprType::I32)
.Case("i64", WebAssembly::ExprType::I64)
.Case("f32", WebAssembly::ExprType::F32)
.Case("f64", WebAssembly::ExprType::F64)
.Case("v128", WebAssembly::ExprType::V128)
.Case("exnref", WebAssembly::ExprType::Exnref)
.Case("void", WebAssembly::ExprType::Void)
.Default(WebAssembly::ExprType::Invalid);
WebAssembly::BlockType parseBlockType(StringRef ID) {
// Multivalue block types are handled separately in parseSignature
return StringSwitch<WebAssembly::BlockType>(ID)
.Case("i32", WebAssembly::BlockType::I32)
.Case("i64", WebAssembly::BlockType::I64)
.Case("f32", WebAssembly::BlockType::F32)
.Case("f64", WebAssembly::BlockType::F64)
.Case("v128", WebAssembly::BlockType::V128)
.Case("exnref", WebAssembly::BlockType::Exnref)
.Case("void", WebAssembly::BlockType::Void)
.Default(WebAssembly::BlockType::Invalid);
}
bool parseRegTypeList(SmallVectorImpl<wasm::ValType> &Types) {
@ -416,7 +417,7 @@ public:
}
void addBlockTypeOperand(OperandVector &Operands, SMLoc NameLoc,
WebAssembly::ExprType BT) {
WebAssembly::BlockType BT) {
Operands.push_back(std::make_unique<WebAssemblyOperand>(
WebAssemblyOperand::Integer, NameLoc, NameLoc,
WebAssemblyOperand::IntOp{static_cast<int64_t>(BT)}));
@ -456,6 +457,7 @@ public:
// If this instruction is part of a control flow structure, ensure
// proper nesting.
bool ExpectBlockType = false;
bool ExpectFuncType = false;
if (Name == "block") {
push(Block);
ExpectBlockType = true;
@ -494,6 +496,10 @@ public:
if (pop(Name, Function) || ensureEmptyNestingStack())
return true;
} else if (Name == "call_indirect" || Name == "return_call_indirect") {
ExpectFuncType = true;
}
if (ExpectFuncType || (ExpectBlockType && Lexer.is(AsmToken::LParen))) {
// This has a special TYPEINDEX operand which in text we
// represent as a signature, such that we can re-build this signature,
// attach it to an anonymous symbol, which is what WasmObjectWriter
@ -502,6 +508,8 @@ public:
auto Signature = std::make_unique<wasm::WasmSignature>();
if (parseSignature(Signature.get()))
return true;
// Got signature as block type, don't need more
ExpectBlockType = false;
auto &Ctx = getStreamer().getContext();
// The "true" here will cause this to be a nameless symbol.
MCSymbol *Sym = Ctx.createTempSymbol("typeindex", true);
@ -526,7 +534,7 @@ public:
if (ExpectBlockType) {
// Assume this identifier is a block_type.
auto BT = parseBlockType(Id.getString());
if (BT == WebAssembly::ExprType::Invalid)
if (BT == WebAssembly::BlockType::Invalid)
return error("Unknown block type: ", Id);
addBlockTypeOperand(Operands, NameLoc, BT);
Parser.Lex();
@ -594,7 +602,7 @@ public:
}
if (ExpectBlockType && Operands.size() == 1) {
// Support blocks with no operands as default to void.
addBlockTypeOperand(Operands, NameLoc, WebAssembly::ExprType::Void);
addBlockTypeOperand(Operands, NameLoc, WebAssembly::BlockType::Void);
}
Parser.Lex();
return false;

2
lib/Target/WebAssembly/Disassembler/LLVMBuild.txt
View File

@ -18,5 +18,5 @@
type = Library
name = WebAssemblyDisassembler
parent = WebAssembly
required_libraries = WebAssemblyDesc MCDisassembler WebAssemblyInfo Support
required_libraries = WebAssemblyDesc MCDisassembler WebAssemblyInfo Support MC
add_to_library_groups = WebAssembly

24
lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp
View File

@ -24,6 +24,7 @@
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCSymbolWasm.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/TargetRegistry.h"
@ -213,10 +214,29 @@ MCDisassembler::DecodeStatus WebAssemblyDisassembler::getInstruction(
return MCDisassembler::Fail;
break;
}
// block_type operands (uint8_t).
// block_type operands:
case WebAssembly::OPERAND_SIGNATURE: {
if (!parseImmediate<uint8_t>(MI, Size, Bytes))
int64_t Val;
uint64_t PrevSize = Size;
if (!nextLEB(Val, Bytes, Size, true))
return MCDisassembler::Fail;
if (Val < 0) {
// Negative values are single septet value types or empty types
if (Size != PrevSize + 1) {
MI.addOperand(
MCOperand::createImm(int64_t(WebAssembly::BlockType::Invalid)));
} else {
MI.addOperand(MCOperand::createImm(Val & 0x7f));
}
} else {
// We don't have access to the signature, so create a symbol without one
MCSymbol *Sym = getContext().createTempSymbol("typeindex", true);
auto *WasmSym = cast<MCSymbolWasm>(Sym);
WasmSym->setType(wasm::WASM_SYMBOL_TYPE_FUNCTION);
const MCExpr *Expr = MCSymbolRefExpr::create(
WasmSym, MCSymbolRefExpr::VK_WASM_TYPEINDEX, getContext());
MI.addOperand(MCOperand::createExpr(Expr));
}
break;
}
// FP operands.

18
lib/Target/WebAssembly/MCTargetDesc/WebAssemblyInstPrinter.cpp
View File

@ -272,9 +272,21 @@ void WebAssemblyInstPrinter::printWebAssemblyP2AlignOperand(const MCInst *MI,
void WebAssemblyInstPrinter::printWebAssemblySignatureOperand(const MCInst *MI,
unsigned OpNo,
raw_ostream &O) {
auto Imm = static_cast<unsigned>(MI->getOperand(OpNo).getImm());
if (Imm != wasm::WASM_TYPE_NORESULT)
O << WebAssembly::anyTypeToString(Imm);
const MCOperand &Op = MI->getOperand(OpNo);
if (Op.isImm()) {
auto Imm = static_cast<unsigned>(Op.getImm());
if (Imm != wasm::WASM_TYPE_NORESULT)
O << WebAssembly::anyTypeToString(Imm);
} else {
auto Expr = cast<MCSymbolRefExpr>(Op.getExpr());
auto *Sym = cast<MCSymbolWasm>(&Expr->getSymbol());
if (Sym->getSignature()) {
O << WebAssembly::signatureToString(Sym->getSignature());
} else {
// Disassembler does not currently produce a signature
O << "unknown_type";
}
}
}
// We have various enums representing a subset of these types, use this

1
lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCCodeEmitter.cpp
View File

@ -152,6 +152,7 @@ void WebAssemblyMCCodeEmitter::encodeInstruction(
break;
case WebAssembly::OPERAND_FUNCTION32:
case WebAssembly::OPERAND_OFFSET32:
case WebAssembly::OPERAND_SIGNATURE:
case WebAssembly::OPERAND_TYPEINDEX:
case WebAssembly::OPERAND_GLOBAL:
case WebAssembly::OPERAND_EVENT:

24
lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.h
View File

@ -122,16 +122,22 @@ enum TOF {
namespace llvm {
namespace WebAssembly {
/// This is used to indicate block signatures.
enum class ExprType : unsigned {
/// Used as immediate MachineOperands for block signatures
enum class BlockType : unsigned {
Invalid = 0x00,
Void = 0x40,
I32 = 0x7F,
I64 = 0x7E,
F32 = 0x7D,
F64 = 0x7C,
V128 = 0x7B,
Exnref = 0x68,
Invalid = 0x00
I32 = unsigned(wasm::ValType::I32),
I64 = unsigned(wasm::ValType::I64),
F32 = unsigned(wasm::ValType::F32),
F64 = unsigned(wasm::ValType::F64),
V128 = unsigned(wasm::ValType::V128),
Exnref = unsigned(wasm::ValType::EXNREF),
// Multivalue blocks (and other non-void blocks) are only emitted when the
// blocks will never be exited and are at the ends of functions (see
// WebAssemblyCFGStackify::fixEndsAtEndOfFunction). They also are never made
// to pop values off the stack, so the exact multivalue signature can always
// be inferred from the return type of the parent function in MCInstLower.
Multivalue = 0xffff,
};
/// Instruction opcodes emitted via means other than CodeGen.

64
lib/Target/WebAssembly/WebAssemblyCFGStackify.cpp
View File

@ -315,12 +315,12 @@ void WebAssemblyCFGStackify::placeBlockMarker(MachineBasicBlock &MBB) {
// br_on_exn 0, $__cpp_exception
// rethrow
// end_block
WebAssembly::ExprType ReturnType = WebAssembly::ExprType::Void;
WebAssembly::BlockType ReturnType = WebAssembly::BlockType::Void;
if (IsBrOnExn) {
const char *TagName = BrOnExn->getOperand(1).getSymbolName();
if (std::strcmp(TagName, "__cpp_exception") != 0)
llvm_unreachable("Only C++ exception is supported");
ReturnType = WebAssembly::ExprType::I32;
ReturnType = WebAssembly::BlockType::I32;
}
auto InsertPos = getLatestInsertPos(Header, BeforeSet, AfterSet);
@ -406,7 +406,7 @@ void WebAssemblyCFGStackify::placeLoopMarker(MachineBasicBlock &MBB) {
auto InsertPos = getEarliestInsertPos(&MBB, BeforeSet, AfterSet);
MachineInstr *Begin = BuildMI(MBB, InsertPos, MBB.findDebugLoc(InsertPos),
TII.get(WebAssembly::LOOP))
.addImm(int64_t(WebAssembly::ExprType::Void));
.addImm(int64_t(WebAssembly::BlockType::Void));
// Decide where in Header to put the END_LOOP.
BeforeSet.clear();
@ -575,7 +575,7 @@ void WebAssemblyCFGStackify::placeTryMarker(MachineBasicBlock &MBB) {
MachineInstr *Begin =
BuildMI(*Header, InsertPos, Header->findDebugLoc(InsertPos),
TII.get(WebAssembly::TRY))
.addImm(int64_t(WebAssembly::ExprType::Void));
.addImm(int64_t(WebAssembly::BlockType::Void));
// Decide where in Header to put the END_TRY.
BeforeSet.clear();
@ -1129,7 +1129,7 @@ bool WebAssemblyCFGStackify::fixUnwindMismatches(MachineFunction &MF) {
MachineInstr *NestedTry =
BuildMI(*MBB, *RangeBegin, RangeBegin->getDebugLoc(),
TII.get(WebAssembly::TRY))
.addImm(int64_t(WebAssembly::ExprType::Void));
.addImm(int64_t(WebAssembly::BlockType::Void));
// Create the nested EH pad and fill instructions in.
MachineBasicBlock *NestedEHPad = MF.CreateMachineBasicBlock();
@ -1231,54 +1231,28 @@ void WebAssemblyCFGStackify::fixEndsAtEndOfFunction(MachineFunction &MF) {
if (MFI.getResults().empty())
return;
// TODO: Generalize from value types to function types for multivalue
WebAssembly::ExprType RetType;
switch (MFI.getResults().front().SimpleTy) {
case MVT::i32:
RetType = WebAssembly::ExprType::I32;
break;
case MVT::i64:
RetType = WebAssembly::ExprType::I64;
break;
case MVT::f32:
RetType = WebAssembly::ExprType::F32;
break;
case MVT::f64:
RetType = WebAssembly::ExprType::F64;
break;
case MVT::v16i8:
case MVT::v8i16:
case MVT::v4i32:
case MVT::v2i64:
case MVT::v4f32:
case MVT::v2f64:
RetType = WebAssembly::ExprType::V128;
break;
case MVT::exnref:
RetType = WebAssembly::ExprType::Exnref;
break;
default:
llvm_unreachable("unexpected return type");
}
// MCInstLower will add the proper types to multivalue signatures based on the
// function return type
WebAssembly::BlockType RetType =
MFI.getResults().size() > 1
? WebAssembly::BlockType::Multivalue
: WebAssembly::BlockType(
WebAssembly::toValType(MFI.getResults().front()));
for (MachineBasicBlock &MBB : reverse(MF)) {
for (MachineInstr &MI : reverse(MBB)) {
if (MI.isPosition() || MI.isDebugInstr())
continue;
if (MI.getOpcode() == WebAssembly::END_BLOCK) {
if (MFI.getResults().size() > 1)
report_fatal_error("Multivalue block signatures not implemented yet");
switch (MI.getOpcode()) {
case WebAssembly::END_BLOCK:
case WebAssembly::END_LOOP:
case WebAssembly::END_TRY:
EndToBegin[&MI]->getOperand(0).setImm(int32_t(RetType));
continue;
default:
// Something other than an `end`. We're done.
return;
}
if (MI.getOpcode() == WebAssembly::END_LOOP) {
if (MFI.getResults().size() > 1)
report_fatal_error("Multivalue loop signatures not implemented yet");
EndToBegin[&MI]->getOperand(0).setImm(int32_t(RetType));
continue;
}
// Something other than an `end`. We're done.
return;
}
}
}

58
lib/Target/WebAssembly/WebAssemblyMCInstLower.cpp
View File

@ -163,6 +163,21 @@ MCOperand WebAssemblyMCInstLower::lowerSymbolOperand(const MachineOperand &MO,
return MCOperand::createExpr(Expr);
}
MCOperand WebAssemblyMCInstLower::lowerTypeIndexOperand(
SmallVector<wasm::ValType, 1> &&Returns,
SmallVector<wasm::ValType, 4> &&Params) const {
auto Signature = std::make_unique<wasm::WasmSignature>(std::move(Returns),
std::move(Params));
MCSymbol *Sym = Printer.createTempSymbol("typeindex");
auto *WasmSym = cast<MCSymbolWasm>(Sym);
WasmSym->setSignature(Signature.get());
Printer.addSignature(std::move(Signature));
WasmSym->setType(wasm::WASM_SYMBOL_TYPE_FUNCTION);
const MCExpr *Expr =
MCSymbolRefExpr::create(WasmSym, MCSymbolRefExpr::VK_WASM_TYPEINDEX, Ctx);
return MCOperand::createExpr(Expr);
}
// Return the WebAssembly type associated with the given register class.
static wasm::ValType getType(const TargetRegisterClass *RC) {
if (RC == &WebAssembly::I32RegClass)
@ -178,6 +193,16 @@ static wasm::ValType getType(const TargetRegisterClass *RC) {
llvm_unreachable("Unexpected register class");
}
static void getFunctionReturns(const MachineInstr *MI,
SmallVectorImpl<wasm::ValType> &Returns) {
const Function &F = MI->getMF()->getFunction();
const TargetMachine &TM = MI->getMF()->getTarget();
Type *RetTy = F.getReturnType();
SmallVector<MVT, 4> CallerRetTys;
computeLegalValueVTs(F, TM, RetTy, CallerRetTys);
valTypesFromMVTs(CallerRetTys, Returns);
}
void WebAssemblyMCInstLower::lower(const MachineInstr *MI,
MCInst &OutMI) const {
OutMI.setOpcode(MI->getOpcode());
@ -208,8 +233,6 @@ void WebAssemblyMCInstLower::lower(const MachineInstr *MI,
if (I < Desc.NumOperands) {
const MCOperandInfo &Info = Desc.OpInfo[I];
if (Info.OperandType == WebAssembly::OPERAND_TYPEINDEX) {
MCSymbol *Sym = Printer.createTempSymbol("typeindex");
SmallVector<wasm::ValType, 4> Returns;
SmallVector<wasm::ValType, 4> Params;
@ -228,26 +251,21 @@ void WebAssemblyMCInstLower::lower(const MachineInstr *MI,
// return_call_indirect instructions have the return type of the
// caller
if (MI->getOpcode() == WebAssembly::RET_CALL_INDIRECT) {
const Function &F = MI->getMF()->getFunction();
const TargetMachine &TM = MI->getMF()->getTarget();
Type *RetTy = F.getReturnType();
SmallVector<MVT, 4> CallerRetTys;
computeLegalValueVTs(F, TM, RetTy, CallerRetTys);
valTypesFromMVTs(CallerRetTys, Returns);
}
if (MI->getOpcode() == WebAssembly::RET_CALL_INDIRECT)
getFunctionReturns(MI, Returns);
auto *WasmSym = cast<MCSymbolWasm>(Sym);
auto Signature = std::make_unique<wasm::WasmSignature>(std::move(Returns),
std::move(Params));
WasmSym->setSignature(Signature.get());
Printer.addSignature(std::move(Signature));
WasmSym->setType(wasm::WASM_SYMBOL_TYPE_FUNCTION);
const MCExpr *Expr = MCSymbolRefExpr::create(
WasmSym, MCSymbolRefExpr::VK_WASM_TYPEINDEX, Ctx);
MCOp = MCOperand::createExpr(Expr);
MCOp = lowerTypeIndexOperand(std::move(Returns), std::move(Params));
break;
} else if (Info.OperandType == WebAssembly::OPERAND_SIGNATURE) {
auto BT = static_cast<WebAssembly::BlockType>(MO.getImm());
assert(BT != WebAssembly::BlockType::Invalid);
if (BT == WebAssembly::BlockType::Multivalue) {
SmallVector<wasm::ValType, 1> Returns;
getFunctionReturns(MI, Returns);
MCOp = lowerTypeIndexOperand(std::move(Returns),
SmallVector<wasm::ValType, 4>());
break;
}
}
}
MCOp = MCOperand::createImm(MO.getImm());

3
lib/Target/WebAssembly/WebAssemblyMCInstLower.h
View File

@ -15,6 +15,7 @@
#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMCINSTLOWER_H
#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMCINSTLOWER_H
#include "llvm/BinaryFormat/Wasm.h"
#include "llvm/MC/MCInst.h"
#include "llvm/Support/Compiler.h"
@ -33,6 +34,8 @@ class LLVM_LIBRARY_VISIBILITY WebAssemblyMCInstLower {
MCSymbol *GetGlobalAddressSymbol(const MachineOperand &MO) const;
MCSymbol *GetExternalSymbolSymbol(const MachineOperand &MO) const;
MCOperand lowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const;
MCOperand lowerTypeIndexOperand(SmallVector<wasm::ValType, 1> &&,
SmallVector<wasm::ValType, 4> &&) const;
public:
WebAssemblyMCInstLower(MCContext &ctx, WebAssemblyAsmPrinter &printer)

24
test/CodeGen/WebAssembly/multivalue.ll
View File

@ -1,7 +1,7 @@
; RUN: llc < %s -asm-verbose=false -verify-machineinstrs -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -mattr=+multivalue | FileCheck %s
; Test that the multivalue attribute is accepted
; TODO(tlively): implement multivalue
; Test that the multivalue returns, function types, and block types
; work as expected.
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown"
@ -10,19 +10,33 @@ target triple = "wasm32-unknown-unknown"
%packed_pair = type <{ i32, i32 }>
; CHECK-LABEL: pair_ident:
; CHECK-NEXT: pair_ident (i32, i32) -> (i32, i32)
; CHECK-NEXT: .functype pair_ident (i32, i32) -> (i32, i32)
; CHECK-NEXT: return $0, $1{{$}}
define %pair @pair_ident(%pair %p) {
ret %pair %p
}
; CHECK-LABEL: packed_pair_ident:
; CHECK-NEXT: packed_pair_ident (i32, i32) -> (i32, i32)
; CHECK-nEXT: return $0, $1{{$}}
; CHECK-NEXT: .functype packed_pair_ident (i32, i32) -> (i32, i32)
; CHECK-NEXT: return $0, $1{{$}}
define %packed_pair @packed_pair_ident(%packed_pair %p) {
ret %packed_pair %p
}
; CHECK-LABEL: minimal_loop:
; CHECK-NEXT: .functype minimal_loop (i32) -> (i32, i64)
; CHECK-NEXT: .LBB{{[0-9]+}}_1:
; CHECK-NEXT: loop () -> (i32, i64)
; CHECK-NEXT: br 0{{$}}
; CHECK-NEXT: .LBB{{[0-9]+}}_2:
; CHECK-NEXT: end_loop{{$}}
define {i32, i64} @minimal_loop(i32* %p) {
entry:
br label %loop
loop:
br label %loop
}
; CHECK-LABEL: .section .custom_section.target_features
; CHECK-NEXT: .int8 1
; CHECK-NEXT: .int8 43

5
test/MC/Disassembler/WebAssembly/wasm-error.txt
View File

@ -2,8 +2,11 @@
# CHECK: .text
# CHECK: block invalid_type
# CHECK: block unknown_type
0x02 0x00
# CHECK: block invalid_type
0x02 0xff 0x42
# CHECK: br 16 # Invalid depth argument!
0x0C 0x10

12
test/MC/WebAssembly/basic-assembly.s
View File

@ -55,6 +55,12 @@ test0:
block i64
block f32
block f64
block () -> (i32, i32)
i32.const 1
i32.const 2
end_block
drop
drop
br_table {0, 1, 2} # 2 entries, default
end_block # first entry jumps here.
i32.const 1
@ -162,6 +168,12 @@ test0:
# CHECK-NEXT: block i64
# CHECK-NEXT: block f32
# CHECK-NEXT: block f64
# CHECK-NEXT: block () -> (i32, i32)
# CHECK-NEXT: i32.const 1
# CHECK-NEXT: i32.const 2
# CHECK-NEXT: end_block
# CHECK-NEXT: drop
# CHECK-NEXT: drop
# CHECK-NEXT: br_table {0, 1, 2} # 1: down to label4
# CHECK-NEXT: # 2: down to label3
# CHECK-NEXT: end_block # label5:

15
tools/llvm-mc/Disassembler.cpp
View File

@ -17,6 +17,7 @@
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDisassembler/MCDisassembler.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
@ -129,13 +130,10 @@ static bool ByteArrayFromString(ByteArrayTy &ByteArray,
return false;
}
int Disassembler::disassemble(const Target &T,
const std::string &Triple,
MCSubtargetInfo &STI,
MCStreamer &Streamer,
MemoryBuffer &Buffer,
SourceMgr &SM,
raw_ostream &Out) {
int Disassembler::disassemble(const Target &T, const std::string &Triple,
MCSubtargetInfo &STI, MCStreamer &Streamer,
MemoryBuffer &Buffer, SourceMgr &SM,
MCContext &Ctx, raw_ostream &Out) {
std::unique_ptr<const MCRegisterInfo> MRI(T.createMCRegInfo(Triple));
if (!MRI) {
@ -149,9 +147,6 @@ int Disassembler::disassemble(const Target &T,
return -1;
}
// Set up the MCContext for creating symbols and MCExpr's.
MCContext Ctx(MAI.get(), MRI.get(), nullptr);
std::unique_ptr<const MCDisassembler> DisAsm(
T.createMCDisassembler(STI, Ctx));
if (!DisAsm) {

10
tools/llvm-mc/Disassembler.h
View File

@ -22,17 +22,15 @@ class MemoryBuffer;
class Target;
class raw_ostream;
class SourceMgr;
class MCContext;
class MCSubtargetInfo;
class MCStreamer;
class Disassembler {
public:
static int disassemble(const Target &T,
const std::string &Triple,
MCSubtargetInfo &STI,
MCStreamer &Streamer,
MemoryBuffer &Buffer,
SourceMgr &SM,
static int disassemble(const Target &T, const std::string &Triple,
MCSubtargetInfo &STI, MCStreamer &Streamer,
MemoryBuffer &Buffer, SourceMgr &SM, MCContext &Ctx,
raw_ostream &Out);
};

4
tools/llvm-mc/llvm-mc.cpp
View File

@ -517,8 +517,8 @@ int main(int argc, char **argv) {
break;
}
if (disassemble)
Res = Disassembler::disassemble(*TheTarget, TripleName, *STI, *Str,
*Buffer, SrcMgr, Out->os());
Res = Disassembler::disassemble(*TheTarget, TripleName, *STI, *Str, *Buffer,
SrcMgr, Ctx, Out->os());
// Keep output if no errors.
if (Res == 0) {