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Make kernel build with clang.

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It's a bit faster than g++ and seems to generate perfectly fine code.
The kernel is also roughly 10% smaller(!)
This commit is contained in:
Andreas Kling 2018-11-09 12:20:44 +01:00
parent 7b3b5f745f
commit ebf308d413
10 changed files with 40 additions and 27 deletions
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8
Kernel/Makefile
View file

@ -55,19 +55,19 @@ BOOTLOADER = Boot/boot.bin
IMAGE = .floppy-image
ARCH_FLAGS =
STANDARD_FLAGS = -std=c++17 -nostdinc++ -nostdlib #-nostdinc
KERNEL_FLAGS = -ffreestanding -fno-stack-protector -fno-ident
KERNEL_FLAGS = -ffreestanding -fno-stack-protector -fno-ident -fno-builtin
WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings
FLAVOR_FLAGS = -mregparm=3 -march=i386 -m32 -fno-exceptions -fno-rtti -fmerge-all-constants -fno-unroll-loops -fno-pie -fno-pic
OPTIMIZATION_FLAGS = -Os -fno-asynchronous-unwind-tables
OPTIMIZATION_FLAGS = -Oz -fno-asynchronous-unwind-tables
INCLUDE_FLAGS = -I.. -I.
SUGGEST_FLAGS = -Wsuggest-final-types -Wsuggest-final-methods -Wsuggest-override #-Wsuggest-attribute=noreturn
#SUGGEST_FLAGS = -Wsuggest-final-types -Wsuggest-final-methods -Wsuggest-override #-Wsuggest-attribute=noreturn
DEFINES = -DSERENITY -DKERNEL -DSANITIZE_PTRS
CXXFLAGS = $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(KERNEL_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(SUGGEST_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
#CXX = /usr/local/gcc-4.8.1-for-linux64/bin/x86_64-pc-linux-g++
#LD = /usr/local/gcc-4.8.1-for-linux64/bin/x86_64-pc-linux-ld
CXX = g++-8
CXX = clang
LD = ld
LDFLAGS = -T linker.ld --strip-debug -melf_i386 --gc-sections --build-id=none -z norelro -z now

6
Kernel/MemoryManager.h
View file

@ -52,7 +52,8 @@ private:
PhysicalAddress m_paddr;
};
struct PageDirectory {
class PageDirectory {
public:
dword entries[1024];
RetainPtr<PhysicalPage> physical_pages[1024];
@ -91,7 +92,8 @@ private:
Vector<RetainPtr<PhysicalPage>> m_physical_pages;
};
struct Region : public Retainable<Region> {
class Region : public Retainable<Region> {
public:
Region(LinearAddress, size_t, String&&, bool r, bool w, bool cow = false);
Region(LinearAddress, size_t, RetainPtr<VMObject>&&, size_t offset_in_vmo, String&&, bool r, bool w, bool cow = false);
Region(LinearAddress, size_t, RetainPtr<VirtualFileSystem::Node>&&, String&&, bool r, bool w);

8
Kernel/StdLib.cpp
View file

@ -3,6 +3,8 @@
#include "kmalloc.h"
#include <AK/Types.h>
extern "C" {
void memcpy(void *dest, const void *src, DWORD n)
{
BYTE* bdest = (BYTE*)dest;
@ -71,8 +73,10 @@ int memcmp(const void* v1, const void* v2, size_t n)
return 0;
}
extern "C" void __cxa_pure_virtual() NORETURN;
extern "C" void __cxa_pure_virtual()
void __cxa_pure_virtual() NORETURN;
void __cxa_pure_virtual()
{
ASSERT_NOT_REACHED();
}
}

4
Kernel/StdLib.h
View file

@ -2,6 +2,8 @@
#include "types.h"
extern "C" {
void memcpy(void*, const void*, DWORD);
void strcpy(char*, const char*);
int strcmp(char const*, const char*);
@ -10,3 +12,5 @@ void *memset(void*, BYTE, DWORD);
char *strdup(const char*);
int memcmp(const void*, const void*, size_t);
char* strrchr(const char* str, int ch);
}

2
Kernel/Syscall.cpp
View file

@ -8,7 +8,7 @@ extern "C" void syscall_entry(RegisterDump&);
extern "C" void syscall_ISR();
extern volatile RegisterDump* syscallRegDump;
asm volatile(
asm(
".globl syscall_ISR \n"
"syscall_ISR:\n"
" pusha\n"