summaryrefslogtreecommitdiffstats
path: root/Help/guide/tutorial/Step6/TutorialConfig.h.in
diff options
context:
space:
mode:
authorBrad King <brad.king@kitware.com>2020-07-08 20:12:19 (GMT)
committerBrad King <brad.king@kitware.com>2020-07-08 20:17:40 (GMT)
commite8051b1f20d90cbefd672d1ba108362f9c55c2db (patch)
treeff7bcb58c883cb29768ea83668a6cf74441dc827 /Help/guide/tutorial/Step6/TutorialConfig.h.in
parent1e26c84b96c0ec6887de2cf5e14061ccb83bdbfe (diff)
downloadCMake-e8051b1f20d90cbefd672d1ba108362f9c55c2db.zip
CMake-e8051b1f20d90cbefd672d1ba108362f9c55c2db.tar.gz
CMake-e8051b1f20d90cbefd672d1ba108362f9c55c2db.tar.bz2
FindJava: Update check to avoid accepting macOS stub 'java' as Java
Since commit dd378258f1 (FindJava: Do not accept OS X stub 'java' as Java, 2014-10-24, v3.1.0-rc3~29^2) we try to avoid using the macOS `/usr/bin/java` stub if no underlying implementation of Java is actually installed. However, the message that `/usr/bin/java` prints when there is no Java available has changed since then. Update our check to also look for the new message. While at it, revise the way we suppress `Java_JAVA_EXECUTABLE`. Previously we set its cache entry to `Java_JAVA_EXECUTABLE-NOTFOUND`, but that would cause the same find-and-reject sequence to be followed every time CMake runs in a build tree. Instead, use the approach from commit 2c0db404d1 (FindSubversion: Do not accept macOS stub without Xcode implementation, 2020-05-28, v3.18.0-rc1~67^2). Leave the cache entry alone and just set a normal variable of the same name to hide it.
Diffstat (limited to 'Help/guide/tutorial/Step6/TutorialConfig.h.in')
0 files changed, 0 insertions, 0 deletions
generated by cgit v0.12 at 2025-05-05 11:29:27 (GMT)
121' href='#n121'>121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 
/*
 * Copyright (C) 2008 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#ifndef AbstractMacroAssembler_h
#define AbstractMacroAssembler_h

#include <wtf/Platform.h>

#include <MacroAssemblerCodeRef.h>
#include <CodeLocation.h>
#include <wtf/Noncopyable.h>
#include <wtf/UnusedParam.h>

#if ENABLE(ASSEMBLER)

namespace JSC {

class LinkBuffer;
class RepatchBuffer;

template <class AssemblerType>
class AbstractMacroAssembler {
public:
    typedef AssemblerType AssemblerType_T;

    typedef MacroAssemblerCodePtr CodePtr;
    typedef MacroAssemblerCodeRef CodeRef;

    class Jump;

    typedef typename AssemblerType::RegisterID RegisterID;
    typedef typename AssemblerType::FPRegisterID FPRegisterID;
    typedef typename AssemblerType::JmpSrc JmpSrc;
    typedef typename AssemblerType::JmpDst JmpDst;


    // Section 1: MacroAssembler operand types
    //
    // The following types are used as operands to MacroAssembler operations,
    // describing immediate  and memory operands to the instructions to be planted.


    enum Scale {
        TimesOne,
        TimesTwo,
        TimesFour,
        TimesEight,
    };

    // Address:
    //
    // Describes a simple base-offset address.
    struct Address {
        explicit Address(RegisterID base, int32_t offset = 0)
            : base(base)
            , offset(offset)
        {
        }

        RegisterID base;
        int32_t offset;
    };

    // ImplicitAddress:
    //
    // This class is used for explicit 'load' and 'store' operations
    // (as opposed to situations in which a memory operand is provided
    // to a generic operation, such as an integer arithmetic instruction).
    //
    // In the case of a load (or store) operation we want to permit
    // addresses to be implicitly constructed, e.g. the two calls:
    //
    //     load32(Address(addrReg), destReg);
    //     load32(addrReg, destReg);
    //
    // Are equivalent, and the explicit wrapping of the Address in the former
    // is unnecessary.
    struct ImplicitAddress {
        ImplicitAddress(RegisterID base)
            : base(base)
            , offset(0)
        {
        }

        ImplicitAddress(Address address)
            : base(address.base)
            , offset(address.offset)
        {
        }

        RegisterID base;
        int32_t offset;
    };

    // BaseIndex:
    //
    // Describes a complex addressing mode.
    struct BaseIndex {
        BaseIndex(RegisterID base, RegisterID index, Scale scale, int32_t offset = 0)
            : base(base)
            , index(index)
            , scale(scale)
            , offset(offset)
        {
        }

        RegisterID base;
        RegisterID index;
        Scale scale;
        int32_t offset;
    };

    // AbsoluteAddress:
    //
    // Describes an memory operand given by a pointer.  For regular load & store
    // operations an unwrapped void* will be used, rather than using this.
    struct AbsoluteAddress {
        explicit AbsoluteAddress(void* ptr)
            : m_ptr(ptr)
        {
        }

        void* m_ptr;
    };

    // ImmPtr:
    //
    // A pointer sized immediate operand to an instruction - this is wrapped
    // in a class requiring explicit construction in order to differentiate
    // from pointers used as absolute addresses to memory operations
    struct ImmPtr {
        explicit ImmPtr(void* value)
            : m_value(value)
        {
        }

        intptr_t asIntptr()
        {
            return reinterpret_cast<intptr_t>(m_value);
        }

        void* m_value;
    };

    // Imm32:
    //
    // A 32bit immediate operand to an instruction - this is wrapped in a
    // class requiring explicit construction in order to prevent RegisterIDs
    // (which are implemented as an enum) from accidentally being passed as
    // immediate values.
    struct Imm32 {
        explicit Imm32(int32_t value)
            : m_value(value)
#if PLATFORM_ARM_ARCH(7)
            , m_isPointer(false)
#endif
        {
        }

#if !PLATFORM(X86_64)
        explicit Imm32(ImmPtr ptr)
            : m_value(ptr.asIntptr())
#if PLATFORM_ARM_ARCH(7)
            , m_isPointer(true)
#endif
        {
        }
#endif

        int32_t m_value;
#if PLATFORM_ARM_ARCH(7)
        // We rely on being able to regenerate code to recover exception handling
        // information.  Since ARMv7 supports 16-bit immediates there is a danger
        // that if pointer values change the layout of the generated code will change.
        // To avoid this problem, always generate pointers (and thus Imm32s constructed
        // from ImmPtrs) with a code sequence that is able  to represent  any pointer
        // value - don't use a more compact form in these cases.
        bool m_isPointer;
#endif
    };


    // Section 2: MacroAssembler code buffer handles
    //
    // The following types are used to reference items in the code buffer
    // during JIT code generation.  For example, the type Jump is used to
    // track the location of a jump instruction so that it may later be
    // linked to a label marking its destination.


    // Label:
    //
    // A Label records a point in the generated instruction stream, typically such that
    // it may be used as a destination for a jump.
    class Label {
        template<class TemplateAssemblerType>
        friend class AbstractMacroAssembler;
        friend class Jump;
        friend class MacroAssemblerCodeRef;
        friend class LinkBuffer;

    public:
        Label()
        {
        }

        Label(AbstractMacroAssembler<AssemblerType>* masm)
            : m_label(masm->m_assembler.label())
        {
        }
        
        bool isUsed() const { return m_label.isUsed(); }
        void used() { m_label.used(); }
    private:
        JmpDst m_label;
    };

    // DataLabelPtr:
    //
    // A DataLabelPtr is used to refer to a location in the code containing a pointer to be
    // patched after the code has been generated.
    class DataLabelPtr {
        template<class TemplateAssemblerType>
        friend class AbstractMacroAssembler;
        friend class LinkBuffer;
    public:
        DataLabelPtr()
        {
        }

        DataLabelPtr(AbstractMacroAssembler<AssemblerType>* masm)
            : m_label(masm->m_assembler.label())
        {
        }
        
    private:
        JmpDst m_label;
    };

    // DataLabel32:
    //
    // A DataLabelPtr is used to refer to a location in the code containing a pointer to be
    // patched after the code has been generated.
    class DataLabel32 {
        template<class TemplateAssemblerType>
        friend class AbstractMacroAssembler;
        friend class LinkBuffer;
    public:
        DataLabel32()
        {
        }

        DataLabel32(AbstractMacroAssembler<AssemblerType>* masm)
            : m_label(masm->m_assembler.label())
        {
        }

    private:
        JmpDst m_label;
    };

    // Call:
    //
    // A Call object is a reference to a call instruction that has been planted
    // into the code buffer - it is typically used to link the call, setting the
    // relative offset such that when executed it will call to the desired
    // destination.
    class Call {
        template<class TemplateAssemblerType>
        friend class AbstractMacroAssembler;

    public:
        enum Flags {
            None = 0x0,
            Linkable = 0x1,
            Near = 0x2,
            LinkableNear = 0x3,
        };

        Call()
            : m_flags(None)
        {
        }
        
        Call(JmpSrc jmp, Flags flags)
            : m_jmp(jmp)
            , m_flags(flags)
        {
        }

        bool isFlagSet(Flags flag)
        {
            return m_flags & flag;
        }

        static Call fromTailJump(Jump jump)
        {
            return Call(jump.m_jmp, Linkable);
        }

        void enableLatePatch()
        {
            m_jmp.enableLatePatch();
        }

        JmpSrc m_jmp;
    private:
        Flags m_flags;
    };

    // Jump:
    //
    // A jump object is a reference to a jump instruction that has been planted
    // into the code buffer - it is typically used to link the jump, setting the
    // relative offset such that when executed it will jump to the desired
    // destination.
    class Jump {
        template<class TemplateAssemblerType>
        friend class AbstractMacroAssembler;
        friend class Call;
        friend class LinkBuffer;
    public:
        Jump()
        {
        }
        
        Jump(JmpSrc jmp)    
            : m_jmp(jmp)
        {
        }
        
        void link(AbstractMacroAssembler<AssemblerType>* masm)
        {
            masm->m_assembler.linkJump(m_jmp, masm->m_assembler.label());
        }
        
        void linkTo(Label label, AbstractMacroAssembler<AssemblerType>* masm)
        {
            masm->m_assembler.linkJump(m_jmp, label.m_label);
        }

        void enableLatePatch()
        {
            m_jmp.enableLatePatch();
        }

    private:
        JmpSrc m_jmp;
    };

    // JumpList:
    //
    // A JumpList is a set of Jump objects.
    // All jumps in the set will be linked to the same destination.
    class JumpList {
        friend class LinkBuffer;

    public:
        void link(AbstractMacroAssembler<AssemblerType>* masm)
        {
            size_t size = m_jumps.size();
            for (size_t i = 0; i < size; ++i)
                m_jumps[i].link(masm);
            m_jumps.clear();
        }
        
        void linkTo(Label label, AbstractMacroAssembler<AssemblerType>* masm)
        {
            size_t size = m_jumps.size();
            for (size_t i = 0; i < size; ++i)
                m_jumps[i].linkTo(label, masm);
            m_jumps.clear();
        }
        
        void append(Jump jump)
        {
            m_jumps.append(jump);
        }
        
        void append(JumpList& other)
        {
            m_jumps.append(other.m_jumps.begin(), other.m_jumps.size());
        }

        bool empty()
        {
            return !m_jumps.size();
        }

    private:
        Vector<Jump, 16> m_jumps;
    };


    // Section 3: Misc admin methods

    static CodePtr trampolineAt(CodeRef ref, Label label)
    {
        return CodePtr(AssemblerType::getRelocatedAddress(ref.m_code.dataLocation(), label.m_label));
    }

    size_t size()
    {
        return m_assembler.size();
    }

    Label label()
    {
        return Label(this);
    }
    
    Label align()
    {
        m_assembler.align(16);
        return Label(this);
    }

    ptrdiff_t differenceBetween(Label from, Jump to)
    {
        return AssemblerType::getDifferenceBetweenLabels(from.m_label, to.m_jmp);
    }

    ptrdiff_t differenceBetween(Label from, Call to)
    {
        return AssemblerType::getDifferenceBetweenLabels(from.m_label, to.m_jmp);
    }

    ptrdiff_t differenceBetween(Label from, Label to)
    {
        return AssemblerType::getDifferenceBetweenLabels(from.m_label, to.m_label);
    }

    ptrdiff_t differenceBetween(Label from, DataLabelPtr to)
    {
        return AssemblerType::getDifferenceBetweenLabels(from.m_label, to.m_label);
    }

    ptrdiff_t differenceBetween(Label from, DataLabel32 to)
    {
        return AssemblerType::getDifferenceBetweenLabels(from.m_label, to.m_label);
    }

    ptrdiff_t differenceBetween(DataLabelPtr from, Jump to)
    {
        return AssemblerType::getDifferenceBetweenLabels(from.m_label, to.m_jmp);
    }

    ptrdiff_t differenceBetween(DataLabelPtr from, DataLabelPtr to)
    {
        return AssemblerType::getDifferenceBetweenLabels(from.m_label, to.m_label);
    }

    ptrdiff_t differenceBetween(DataLabelPtr from, Call to)
    {
        return AssemblerType::getDifferenceBetweenLabels(from.m_label, to.m_jmp);
    }

protected:
    AssemblerType m_assembler;

    friend class LinkBuffer;
    friend class RepatchBuffer;

    static void linkJump(void* code, Jump jump, CodeLocationLabel target)
    {
        AssemblerType::linkJump(code, jump.m_jmp, target.dataLocation());
    }

    static void linkPointer(void* code, typename AssemblerType::JmpDst label, void* value)
    {
        AssemblerType::linkPointer(code, label, value);
    }

    static void* getLinkerAddress(void* code, typename AssemblerType::JmpSrc label)
    {
        return AssemblerType::getRelocatedAddress(code, label);
    }

    static void* getLinkerAddress(void* code, typename AssemblerType::JmpDst label)
    {
        return AssemblerType::getRelocatedAddress(code, label);
    }

    static unsigned getLinkerCallReturnOffset(Call call)
    {
        return AssemblerType::getCallReturnOffset(call.m_jmp);
    }

    static void repatchJump(CodeLocationJump jump, CodeLocationLabel destination)
    {
        AssemblerType::relinkJump(jump.dataLocation(), destination.dataLocation());
    }

    static void repatchNearCall(CodeLocationNearCall nearCall, CodeLocationLabel destination)
    {
        AssemblerType::relinkCall(nearCall.dataLocation(), destination.executableAddress());
    }

    static void repatchInt32(CodeLocationDataLabel32 dataLabel32, int32_t value)
    {
        AssemblerType::repatchInt32(dataLabel32.dataLocation(), value);
    }

    static void repatchPointer(CodeLocationDataLabelPtr dataLabelPtr, void* value)
    {
        AssemblerType::repatchPointer(dataLabelPtr.dataLocation(), value);
    }

    static void repatchLoadPtrToLEA(CodeLocationInstruction instruction)
    {
        AssemblerType::repatchLoadPtrToLEA(instruction.dataLocation());
    }
};

} // namespace JSC

#endif // ENABLE(ASSEMBLER)

#endif // AbstractMacroAssembler_h
generated by cgit v0.12 at 2025-05-05 11:29:24 (GMT)