os_linux_riscv32.cpp中注释掉的函数体问题解决

[DingliZhang]

#21 中提到的

issue #15 , PR #24 中涉及到的os_linux_riscv32.cpp中还有注释掉的函数体，需要后续解决。
提交结点为：6e8391a630b5f6af59dc7756cf86e65f9de4d6ba
函数名称为：atomic_load_long_bootstrap, atomic_store_long_bootstrap.

[DingliZhang]

删除了os_linux_riscv32.cpp以及os_linux_riscv32.hpp中的函数：

• atomic_load_long_bootstrap
• atomic_store_long_bootstrap
• atomic_load_long_func
• atomic_store_long_func

这些函数在实际流程中不会执行到，只是因为如果完全参考bishengJDK中的atomic_linux_riscv64.hpp（即不在atomic_linux_riscv32.hpp中增加模板Atomic::PlatformLoad及Atomic::PlatformStore），会出现以下报错：

/home/dingli/isrc-jdk11u/jdk11u/src/hotspot/share/runtime/atomic.hpp: In instantiation of 'void Atomic::PlatformStore<byte_size>::operator()(T, volatile T*) const [with T = long long int; unsigned int byte_size = 8]':
/home/dingli/isrc-jdk11u/jdk11u/src/hotspot/share/runtime/atomic.hpp:435:17:   required from 'void Atomic::StoreImpl<T, T, PlatformOp, typename EnableIf<(IsIntegral<T>::value || IsRegisteredEnum<T>::value)>::type>::operator()(T, volatile T*) const [with T = long long int; PlatformOp = Atomic::PlatformStore<8>; typename EnableIf<(IsIntegral<T>::value || IsRegisteredEnum<T>::value)>::type = void]'
/home/dingli/isrc-jdk11u/jdk11u/src/hotspot/share/runtime/atomic.hpp:599:47:   required from 'static void Atomic::store(T, volatile D*) [with T = long long int; D = long long int]'
/home/dingli/isrc-jdk11u/jdk11u/src/hotspot/share/utilities/vmError.cpp:399:44:   required from here
/home/dingli/isrc-jdk11u/jdk11u/src/hotspot/share/utilities/debug.hpp:203:38: error: incomplete type 'STATIC_ASSERT_FAILURE<false>' used in nested name specifier
  203 |     STATIC_ASSERT_FAILURE< (Cond) >::value ]
      |                                      ^~~~~
/home/dingli/isrc-jdk11u/jdk11u/src/hotspot/share/runtime/atomic.hpp:489:5: note: in expansion of macro 'STATIC_ASSERT'
  489 |     STATIC_ASSERT(sizeof(T) <= sizeof(void*)); // wide atomics need specialization
      |     ^~~~~~~~~~~~~
/home/dingli/isrc-jdk11u/jdk11u/src/hotspot/share/runtime/atomic.hpp: In instantiation of 'T Atomic::PlatformLoad<byte_size>::operator()(const volatile T*) const [with T = long long int; unsigned int byte_size = 8]':
/home/dingli/isrc-jdk11u/jdk11u/src/hotspot/share/runtime/atomic.hpp:383:24:   required from 'T Atomic::LoadImpl<T, PlatformOp, typename EnableIf<((IsIntegral<T>::value || IsRegisteredEnum<T>::value) || IsPointer<T>::value)>::type>::operator()(const volatile T*) const [with T = long long int; PlatformOp = Atomic::PlatformLoad<8>; typename EnableIf<((IsIntegral<T>::value || IsRegisteredEnum<T>::value) || IsPointer<T>::value)>::type = void]'
/home/dingli/isrc-jdk11u/jdk11u/src/hotspot/share/runtime/atomic.hpp:594:49:   required from 'static T Atomic::load(const volatile T*) [with T = long long int]'
/home/dingli/isrc-jdk11u/jdk11u/src/hotspot/share/utilities/vmError.cpp:403:45:   required from here
/home/dingli/isrc-jdk11u/jdk11u/src/hotspot/share/utilities/debug.hpp:203:38: error: incomplete type 'STATIC_ASSERT_FAILURE<false>' used in nested name specifier
  203 |     STATIC_ASSERT_FAILURE< (Cond) >::value ]
      |                                      ^~~~~
/home/dingli/isrc-jdk11u/jdk11u/src/hotspot/share/runtime/atomic.hpp:419:5: note: in expansion of macro 'STATIC_ASSERT'
  419 |     STATIC_ASSERT(sizeof(T) <= sizeof(void*)); // wide atomics need specialization
      |     ^~~~~~~~~~~~~

因此参考arm中的实现，定义两个空的模板Atomic::PlatformLoad及Atomic::PlatformStore，保证编译顺利通过。

[DingliZhang]

提交了PR #124 ，编译过程：
build.log
请 @shining1984 review和验证。

[DingliZhang]

使用qemu用户模式执行java -version:

$ /home/dingli/qemu_install/qemu-5.2.0/bin/qemu-riscv32 -L /home/dingli/toolchain/riscv32/sysroot ./java -version

运行报错：

# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc:  SuppressErrorAt=/macroAssembler_riscv32.cpp:2632
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (/home/dingli/isrc-jdk11u/jdk11u/src/hotspot/cpu/riscv32/macroAssembler_riscv32.cpp:2632), pid=32200, tid=32208
#  assert(ReservedCodeCacheSize < 4*G) failed: branch out of range
#
# JRE version:  (11.0.9) (fastdebug build )
# Java VM: OpenJDK Core VM (fastdebug 11.0.9-internal+0-adhoc.dingli.jdk11u, interpreted mode, sharing, serial gc, linux-riscv32)
# Core dump will be written. Default location: Core dumps may be processed with "/usr/share/apport/apport %p %s %c %d %P %E" (or dumping to /home/dingli/isrc-jdk11u/jdk11u/fastdebug_32_core/jvm/openjdk-11.0.9-internal/bin/core.32200)
#
# An error report file with more information is saved as:
# /home/dingli/isrc-jdk11u/jdk11u/fastdebug_32_core/jvm/openjdk-11.0.9-internal/bin/hs_err_pid32200.log
#
#
Current thread is 32208
Dumping core ...
Aborted (core dumped)