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//===- llvm/unittest/MC/DwarfLineTables.cpp ------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/STLExtras.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDwarf.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCTargetOptions.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
struct Context {
const char *TripleName = "x86_64-pc-linux";
std::unique_ptr<MCRegisterInfo> MRI;
std::unique_ptr<MCAsmInfo> MAI;
std::unique_ptr<MCContext> Ctx;
Context() {
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllDisassemblers();
// If we didn't build x86, do not run the test.
std::string Error;
const Target *TheTarget = TargetRegistry::lookupTarget(TripleName, Error);
if (!TheTarget)
return;
MRI.reset(TheTarget->createMCRegInfo(TripleName));
MCTargetOptions MCOptions;
MAI.reset(TheTarget->createMCAsmInfo(*MRI, TripleName, MCOptions));
Ctx = std::make_unique<MCContext>(Triple(TripleName), MAI.get(), MRI.get(),
/*MSTI=*/nullptr);
}
operator bool() { return Ctx.get(); }
operator MCContext &() { return *Ctx; };
};
Context &getContext() {
static Context Ctxt;
return Ctxt;
}
}
void verifyEncoding(MCDwarfLineTableParams Params, int LineDelta, int AddrDelta,
ArrayRef<uint8_t> ExpectedEncoding) {
SmallString<16> Buffer;
raw_svector_ostream EncodingOS(Buffer);
MCDwarfLineAddr::Encode(getContext(), Params, LineDelta, AddrDelta,
EncodingOS);
EXPECT_EQ(ExpectedEncoding, arrayRefFromStringRef(Buffer));
}
TEST(DwarfLineTables, TestDefaultParams) {
if (!getContext())
return;
MCDwarfLineTableParams Params;
// Minimal line offset expressible through extended opcode, 0 addr delta
const uint8_t Encoding0[] = {13}; // Special opcode Addr += 0, Line += -5
verifyEncoding(Params, -5, 0, Encoding0);
// Maximal line offset expressible through extended opcode,
const uint8_t Encoding1[] = {26}; // Special opcode Addr += 0, Line += +8
verifyEncoding(Params, 8, 0, Encoding1);
// Random value in the middle of the special ocode range
const uint8_t Encoding2[] = {146}; // Special opcode Addr += 9, Line += 2
verifyEncoding(Params, 2, 9, Encoding2);
// Minimal line offset expressible through extended opcode, max addr delta
const uint8_t Encoding3[] = {251}; // Special opcode Addr += 17, Line += -5
verifyEncoding(Params, -5, 17, Encoding3);
// Biggest special opcode
const uint8_t Encoding4[] = {255}; // Special opcode Addr += 17, Line += -1
verifyEncoding(Params, -1, 17, Encoding4);
// Line delta outside of the special opcode range, address delta in range
const uint8_t Encoding5[] = {dwarf::DW_LNS_advance_line, 9,
158}; // Special opcode Addr += 10, Line += 0
verifyEncoding(Params, 9, 10, Encoding5);
// Address delta outside of the special opcode range, but small
// enough to do DW_LNS_const_add_pc + special opcode.
const uint8_t Encoding6[] = {dwarf::DW_LNS_const_add_pc, // pc += 17
62}; // Special opcode Addr += 3, Line += 2
verifyEncoding(Params, 2, 20, Encoding6);
// Address delta big enough to require the use of DW_LNS_advance_pc
// Line delta in special opcode range
const uint8_t Encoding7[] = {dwarf::DW_LNS_advance_pc, 100,
20}; // Special opcode Addr += 0, Line += 2
verifyEncoding(Params, 2, 100, Encoding7);
// No special opcode possible.
const uint8_t Encoding8[] = {dwarf::DW_LNS_advance_line, 20,
dwarf::DW_LNS_advance_pc, 100,
dwarf::DW_LNS_copy};
verifyEncoding(Params, 20, 100, Encoding8);
}
TEST(DwarfLineTables, TestCustomParams) {
if (!getContext())
return;
// Some tests against the example values given in the standard.
MCDwarfLineTableParams Params;
Params.DWARF2LineOpcodeBase = 13;
Params.DWARF2LineBase = -3;
Params.DWARF2LineRange = 12;
// Minimal line offset expressible through extended opcode, 0 addr delta
const uint8_t Encoding0[] = {13}; // Special opcode Addr += 0, Line += -5
verifyEncoding(Params, -3, 0, Encoding0);
// Maximal line offset expressible through extended opcode,
const uint8_t Encoding1[] = {24}; // Special opcode Addr += 0, Line += +8
verifyEncoding(Params, 8, 0, Encoding1);
// Random value in the middle of the special ocode range
const uint8_t Encoding2[] = {126}; // Special opcode Addr += 9, Line += 2
verifyEncoding(Params, 2, 9, Encoding2);
// Minimal line offset expressible through extended opcode, max addr delta
const uint8_t Encoding3[] = {253}; // Special opcode Addr += 20, Line += -3
verifyEncoding(Params, -3, 20, Encoding3);
// Biggest special opcode
const uint8_t Encoding4[] = {255}; // Special opcode Addr += 17, Line += -1
verifyEncoding(Params, -1, 20, Encoding4);
// Line delta outside of the special opcode range, address delta in range
const uint8_t Encoding5[] = {dwarf::DW_LNS_advance_line, 9,
136}; // Special opcode Addr += 10, Line += 0
verifyEncoding(Params, 9, 10, Encoding5);
// Address delta outside of the special opcode range, but small
// enough to do DW_LNS_const_add_pc + special opcode.
const uint8_t Encoding6[] = {dwarf::DW_LNS_const_add_pc, // pc += 20
138}; // Special opcode Addr += 10, Line += 2
verifyEncoding(Params, 2, 30, Encoding6);
// Address delta big enough to require the use of DW_LNS_advance_pc
// Line delta in special opcode range
const uint8_t Encoding7[] = {dwarf::DW_LNS_advance_pc, 100,
18}; // Special opcode Addr += 0, Line += 2
verifyEncoding(Params, 2, 100, Encoding7);
// No special opcode possible.
const uint8_t Encoding8[] = {dwarf::DW_LNS_advance_line, 20,
dwarf::DW_LNS_advance_pc, 100,
dwarf::DW_LNS_copy};
verifyEncoding(Params, 20, 100, Encoding8);
}
TEST(DwarfLineTables, TestCustomParams2) {
if (!getContext())
return;
// Corner case param values.
MCDwarfLineTableParams Params;
Params.DWARF2LineOpcodeBase = 13;
Params.DWARF2LineBase = 1;
Params.DWARF2LineRange = 255;
const uint8_t Encoding0[] = {dwarf::DW_LNS_advance_line, 248, 1,
dwarf::DW_LNS_copy};
verifyEncoding(Params, 248, 0, Encoding0);
}
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