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Replace atomic 64-bit operations with spinlock protected operations on ios_arm32. (#2647)

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This commit is contained in:
Nikolay Igotti
2019-02-12 15:49:03 +03:00
committed by GitHub
parent 9057475497
commit 1a43a2a862
2 changed files with 24 additions and 13 deletions
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runtime/src/main/cpp/Atomic.cpp
+5 -9
View File
@@ -95,14 +95,13 @@ KLong Kotlin_AtomicLong_addAndGet(KRef thiz, KLong delta) {
return addAndGetImpl(thiz, delta);
}
#ifdef __mips
#if KONAN_NO_64BIT_ATOMIC
static int lock64 = 0;
#endif
KLong Kotlin_AtomicLong_compareAndSwap(KRef thiz, KLong expectedValue, KLong newValue) {
#ifdef __mips
#if KONAN_NO_64BIT_ATOMIC
// Potentially huge performance penalty, but correct.
// TODO: reconsider, once target MIPS can do proper 64-bit CAS.
while (compareAndSwap(&lock64, 0, 1) != 0);
volatile KLong* address = getValueLocation<KLong>(thiz);
KLong old = *address;
@@ -117,9 +116,8 @@ KLong Kotlin_AtomicLong_compareAndSwap(KRef thiz, KLong expectedValue, KLong new
}
KBoolean Kotlin_AtomicLong_compareAndSet(KRef thiz, KLong expectedValue, KLong newValue) {
#ifdef __mips
#if KONAN_NO_64BIT_ATOMIC
// Potentially huge performance penalty, but correct.
// TODO: reconsider, once target MIPS can do proper 64-bit CAS.
KBoolean result = false;
while (compareAndSwap(&lock64, 0, 1) != 0);
volatile KLong* address = getValueLocation<KLong>(thiz);
@@ -136,9 +134,8 @@ KBoolean Kotlin_AtomicLong_compareAndSet(KRef thiz, KLong expectedValue, KLong n
}
void Kotlin_AtomicLong_set(KRef thiz, KLong newValue) {
#ifdef __mips
#if KONAN_NO_64BIT_ATOMIC
// Potentially huge performance penalty, but correct.
// TODO: reconsider, once target MIPS can do proper 64-bit atomic store.
while (compareAndSwap(&lock64, 0, 1) != 0);
volatile KLong* address = getValueLocation<KLong>(thiz);
*address = newValue;
@@ -149,9 +146,8 @@ void Kotlin_AtomicLong_set(KRef thiz, KLong newValue) {
}
KLong Kotlin_AtomicLong_get(KRef thiz) {
#ifdef __mips
#if KONAN_NO_64BIT_ATOMIC
// Potentially huge performance penalty, but correct.
// TODO: reconsider, once target MIPS can do proper 64-bit atomic store.
while (compareAndSwap(&lock64, 0, 1) != 0);
volatile KLong* address = getValueLocation<KLong>(thiz);
KLong value = *address;
shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/ClangArgs.kt
+19 -4
View File
@@ -135,12 +135,16 @@ class ClangArgs(private val configurables: Configurables) : Configurables by con
KonanTarget.LINUX_MIPS32 ->
listOf("-DUSE_GCC_UNWIND=1",
"-DUSE_ELF_SYMBOLS=1",
"-DELFSIZE=32")
"-DELFSIZE=32",
// TODO: reconsider, once target MIPS can do proper 64-bit load/store/CAS.
"-DKONAN_NO_64BIT_ATOMIC=1")
KonanTarget.LINUX_MIPSEL32 ->
listOf("-DUSE_GCC_UNWIND=1",
"-DUSE_ELF_SYMBOLS=1",
"-DELFSIZE=32")
"-DELFSIZE=32",
// TODO: reconsider, once target MIPS can do proper 64-bit load/store/CAS.
"-DKONAN_NO_64BIT_ATOMIC=1")
KonanTarget.MINGW_X64 ->
listOf("-DUSE_GCC_UNWIND=1",
@@ -155,11 +159,22 @@ class ClangArgs(private val configurables: Configurables) : Configurables by con
"-DKONAN_CORE_SYMBOLICATION=1",
"-DKONAN_HAS_CXX11_EXCEPTION_FUNCTIONS=1")
KonanTarget.IOS_ARM32, KonanTarget.IOS_ARM64 ->
KonanTarget.IOS_ARM32 ->
listOf("-DKONAN_OBJC_INTEROP=1",
"-DKONAN_HAS_CXX11_EXCEPTION_FUNCTIONS=1",
"-DKONAN_REPORT_BACKTRACE_TO_IOS_CRASH_LOG=1",
"-DMACHSIZE=${target.architecture.bitness}")
"-DMACHSIZE=32",
// While not 100% correct here, using atomic ops on iOS armv7 requires 8 byte alignment,
// and general ABI requires 4-byte alignment on 64-bit long fields as mentioned in
// https://developer.apple.com/library/archive/documentation/Xcode/Conceptual/iPhoneOSABIReference/Articles/ARMv6FunctionCallingConventions.html#//apple_ref/doc/uid/TP40009021-SW1
// See https://github.com/ktorio/ktor/issues/941 for the context.
"-DKONAN_NO_64BIT_ATOMIC=1")
KonanTarget.IOS_ARM64 ->
listOf("-DKONAN_OBJC_INTEROP=1",
"-DKONAN_HAS_CXX11_EXCEPTION_FUNCTIONS=1",
"-DKONAN_REPORT_BACKTRACE_TO_IOS_CRASH_LOG=1",
"-DMACHSIZE=64")
KonanTarget.IOS_X64 ->
listOf("-DKONAN_OBJC_INTEROP=1",