Before interpreter. Cleanup build script. Begin writing code analyzer tool to find common mistakes

1 files changed, 0 insertions, 385 deletions

diff --git a/src/asm/x86_64.c b/src/asm/x86_64.c
deleted file mode 100644
index e246fbc..0000000
--- a/src/asm/x86_64.c
+++ /dev/null
@@ -1,385 +0,0 @@
-#include "../../include/asm/x86_64.h"
-
-#include "../../include/std/mem.h"
-#include "../../include/std/log.h"
-#include <errno.h>
-#include <assert.h>
-#include <stdio.h>
-
-#include <sys/mman.h>
-
-#define REX_W 0x48
-
-void asm_ptr_init(AsmPtr *self, Reg64 base) {
-    self->base = base;
-    self->index = -1;
-    self->disp = 0;
-    self->scale = 0;
-}
-
-void asm_ptr_init_index(AsmPtr *self, Reg64 base, Reg64 index) {
-    self->base = base;
-    self->index = index;
-    self->disp = 0;
-    self->scale = 0;
-}
-
-void asm_ptr_init_disp(AsmPtr *self, Reg64 base, i32 disp) {
-    self->base = base;
-    self->index = -1;
-    self->disp = disp;
-    self->scale = 0;
-}
-
-void asm_ptr_init_index_disp(AsmPtr *self, Reg64 base, Reg64 index, i32 disp) {
-    self->base = base;
-    self->index = index;
-    self->disp = disp;
-    self->scale = 0;
-}
-
-int asm_init(Asm *self) {
-    self->size = am_pagesize();
-    amal_log_debug("asm: page size: %u", self->size);
-    self->code = mmap(NULL, self->size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
-    if(self->code == MAP_FAILED)
-        return -errno;
-    self->code_it = self->code;
-    return 0;
-}
-
-void asm_deinit(Asm *self) {
-    if(self->code)
-        munmap(self->code, self->size);
-    self->code = NULL;
-    self->code_it = NULL;
-    self->size = 0;
-}
-
-static void asm_print_code_hex(Asm *self) {
-    u8 *ptr;
-    int off;
-    ptr = self->code;
-    off = 0;
-    while(ptr != self->code_it) {
-        printf("%02x", *ptr);
-        ++ptr;
-        ++off;
-        if(off == 8) {
-            putc('\n', stdout);
-            off = 0;
-        } else {
-            putc(' ', stdout);
-        }
-    }
-    if(off != 0)
-        putc('\n', stdout);
-}
-
-int asm_execute(Asm *self) {
-    void (*func)();
-    if(mprotect(self->code, self->size, PROT_READ | PROT_EXEC) != 0)
-        return -errno;
-
-    asm_print_code_hex(self);
-
-    /* TODO: Verify if this is valid on all platforms. According to ISO C standard it isn't? */
-    *(void**)(&func) = self->code;
-    func();
-    return 0;
-}
-
-/* TODO: See how this can be optimized */
-static CHECK_RESULT int asm_ensure_capacity(Asm *self, usize size) {
-    usize current_offset;
-    current_offset = (u8*)self->code_it - (u8*)self->code;
-    if(current_offset + size > self->size) {
-        void *new_mem;
-        usize new_size;
-        new_size = self->size + am_pagesize();
-        new_mem = mmap(NULL, new_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
-        if(self->code == MAP_FAILED)
-            return -errno;
-
-        am_memcpy(new_mem, self->code, self->size);
-        self->code = new_mem;
-        self->size = new_size;
-        self->code_it = (u8*)self->code + current_offset;
-    }
-    return 0;
-}
-
-#ifdef DEBUG
-static isize asm_get_capacity_left(Asm *self) {
-    return (isize)self->size - (isize)((u8*)self->code_it - (u8*)self->code);
-}
-#endif
-
-int asm_nop(Asm *self) {
-    return_if_error(asm_ensure_capacity(self, 1));
-    *self->code_it++ = 0x90;
-    return 0;
-}
-
-static i32 abs_i32(i32 value) {
-    return value >= 0 ? value : -value;
-}
-
-/*
-TODO: Implement 1 and 2 byte displacement?
-There has to be at least 6 bytes left in the asm buffer before calling this function.
-*/
-static void asm_rm(Asm *self, AsmPtr *mem, Reg64 reg) {
-    u8 rm_byte;
-    u8 disp_bytes;
-    assert(asm_get_capacity_left(self) >= 6);
-    if((int)mem->index != -1) {
-        u8 sib_offset;
-        if(mem->disp == 0) {
-            rm_byte = 0x04;
-            disp_bytes = 0;
-        } else if(abs_i32(mem->disp) <= INT8_MAX) {
-            rm_byte = 0x44;
-            disp_bytes = 1;
-        } else {
-            rm_byte = 0x84;
-            disp_bytes = 4;
-        }
-
-        #ifdef DEBUG
-        if(mem->scale != 0 && mem->scale != 2 && mem->scale != 4 && mem->scale != 8) {
-            amal_log_error("Invalid scale %d, expected 0, 2, 4, or 8", mem->scale);
-            assert(bool_false);
-        }
-        #endif
-        assert(mem->base != RBP && "TODO: Implement RBP base for sib byte. RBP is special and requires different logic");
-        sib_offset = (mem->scale << 5) + 8*mem->index + mem->base;
-
-        *self->code_it++ = rm_byte;
-        *self->code_it++ = sib_offset;
-    } else {
-        if(mem->disp == 0) {
-            if(mem->base == RBP) {
-                rm_byte = 0x45;
-                disp_bytes = 1;
-            } else {
-                rm_byte = mem->base;
-                disp_bytes = 0;
-            }
-        } else if(abs_i32(mem->disp) <= INT8_MAX) {
-            rm_byte = 0x40 + mem->base;
-            disp_bytes = 1;
-        } else {
-            rm_byte = 0x80 + mem->base;
-            disp_bytes = 4;
-        }
-        *self->code_it++ = (reg << 3) | rm_byte;
-    }
-
-    am_memcpy(self->code_it, &mem->disp, disp_bytes);
-    self->code_it += disp_bytes;
-}
-
-/* There has to be at least 1 byte left in the asm buffer before calling this function. */
-static void asm_rr(Asm *self, Reg64 dst, Reg64 src) {
-    assert(asm_get_capacity_left(self) >= 1);
-    *self->code_it++ = 0xC0 + dst + 8*src;
-}
-
-/* TODO: Implement 1 and 2 byte immediate? */
-int asm_mov_mi(Asm *self, AsmPtr *dst, i32 immediate) {
-    /* 12 bytes is the maximum size of the instruction. We don't how how large it will be so we prepare for the largest size */
-    return_if_error(asm_ensure_capacity(self, 12));
-    *self->code_it++ = REX_W;
-    *self->code_it++ = 0xC7;
-    asm_rm(self, dst, 0);
-    am_memcpy(self->code_it, &immediate, sizeof(immediate));
-    self->code_it += sizeof(immediate);
-    return 0;
-}
-
-int asm_mov_mr(Asm *self, AsmPtr *dst, Reg64 src) {
-    /* 8 bytes is the maximum size of the instruction. We don't how how large it will be so we prepare for the largest size */
-    return_if_error(asm_ensure_capacity(self, 8));
-    *self->code_it++ = REX_W;
-    *self->code_it++ = 0x89;
-    asm_rm(self, dst, src);
-    return 0;
-}
-
-int asm_mov_rm(Asm *self, Reg64 dst, AsmPtr *src) {
-    /* 8 bytes is the maximum size of the instruction. We don't how how large it will be so we prepare for the largest size */
-    return_if_error(asm_ensure_capacity(self, 8));
-    *self->code_it++ = REX_W;
-    *self->code_it++ = 0x8B;
-    asm_rm(self, src, dst);
-    return 0;
-}
-
-int asm_mov_ri(Asm *self, Reg64 dst, i64 immediate) {
-    /* 10 bytes is the maximum size of the instruction. We don't how how large it will be so we prepare for the largest size */
-    return_if_error(asm_ensure_capacity(self, 10));
-    *self->code_it++ = REX_W;
-    *self->code_it++ = 0xB8 + dst;
-    am_memcpy(self->code_it, &immediate, sizeof(immediate));
-    self->code_it += sizeof(immediate);
-    return 0;
-}
-
-int asm_mov_rr(Asm *self, Reg64 dst, Reg64 src) {
-    /* 3 bytes is the maximum size of the instruction. We don't how how large it will be so we prepare for the largest size */
-    return_if_error(asm_ensure_capacity(self, 3));
-    *self->code_it++ = REX_W;
-    *self->code_it++ = 0x89;
-    asm_rr(self, dst, src);
-    return 0;
-}
-
-int asm_add_rr(Asm *self, Reg64 dst, Reg64 src) {
-    /* 3 bytes is the maximum size of the instruction. We don't how how large it will be so we prepare for the largest size */
-    return_if_error(asm_ensure_capacity(self, 3));
-    *self->code_it++ = REX_W;
-    *self->code_it++ = 0x01;
-    asm_rr(self, dst, src);
-    return 0;
-}
-
-int asm_sub_rr(Asm *self, Reg64 dst, Reg64 src) {
-    /* 3 bytes is the maximum size of the instruction. We don't how how large it will be so we prepare for the largest size */
-    return_if_error(asm_ensure_capacity(self, 3));
-    *self->code_it++ = REX_W;
-    *self->code_it++ = 0x29;
-    asm_rr(self, dst, src);
-    return 0;
-}
-
-int asm_imul_rr(Asm *self, Reg64 dst, Reg64 src) {
-    /* 3 bytes is the maximum size of the instruction. We don't how how large it will be so we prepare for the largest size */
-    return_if_error(asm_ensure_capacity(self, 4));
-    *self->code_it++ = REX_W;
-    *self->code_it++ = 0x0F;
-    *self->code_it++ = 0xAF;
-    asm_rr(self, dst, src);
-    return 0;
-}
-
-int asm_pushr(Asm *self, Reg64 reg) {
-    return_if_error(asm_ensure_capacity(self, 1));
-    *self->code_it++ = 0x50 + reg;
-    return 0;
-}
-
-int asm_popr(Asm *self, Reg64 reg) {
-    return_if_error(asm_ensure_capacity(self, 1));
-    *self->code_it++ = 0x58 + reg;
-    return 0;
-}
-
-/* /r */
-#define DEFINE_INS_RM(mnemonic, opcode)                         \
-int asm_##mnemonic##_rm32(Asm *self, Reg32 dst, Reg32 src) {    \
-    return_if_error(asm_ensure_capacity(self, 2));              \
-    *self->code_it++ = opcode;                             \
-    *self->code_it++ = 0xC0 + 8*dst + src;                 \
-    return 0;                                                   \
-}                                                               \
-                                                                \
-int asm_##mnemonic##_rm64(Asm *self, Reg64 dst, Reg64 src) {    \
-    return_if_error(asm_ensure_capacity(self, 1));              \
-    *self->code_it++ = REX_W;                               \
-    return asm_##mnemonic##_rm32(self, (Reg32)dst, (Reg32)src); \
-}
-
-DEFINE_INS_RM(mov, 0x8B)
-DEFINE_INS_RM(add, 0x03)
-DEFINE_INS_RM(sub, 0x2B)
-DEFINE_INS_RM(and, 0x23)
-DEFINE_INS_RM(or, 0x0B)
-DEFINE_INS_RM(xor, 0x33)
-DEFINE_INS_RM(cmp, 0x3B)
-
-/*
-    /number
-    The number is called the extension, a number from 0 to 7;
-    It's a number used to extend the opcode type, since the instruction only uses
-    one register the other register can be encoded for that.
-*/
-#define DEFINE_INS_EXT_IMM(mnemonic, extension)                      \
-int asm_##mnemonic##_rm32_imm(Asm *self, Reg32 reg, i32 immediate) { \
-    if(abs_i32(immediate) <= INT8_MAX) {                                 \
-        return_if_error(asm_ensure_capacity(self, 3));               \
-        *self->code_it++ = 0x83;                                \
-        *self->code_it++ = 0xC0 + 8*extension + reg;            \
-        *self->code_it++ = (u8)immediate;                       \
-    } else {                                                         \
-        return_if_error(asm_ensure_capacity(self, 6));               \
-        *self->code_it++ = 0x81;                                \
-        *self->code_it++ = 0xC0 + 8*extension + reg;            \
-        am_memcpy(self->code_it, &immediate, sizeof(immediate));     \
-        self->code_it += sizeof(immediate);                          \
-    }                                                                \
-    return 0;                                                        \
-}                                                                    \
-                                                                     \
-int asm_##mnemonic##_rm64_imm(Asm *self, Reg64 reg, i32 immediate) { \
-    return_if_error(asm_ensure_capacity(self, 1));                   \
-    *self->code_it++ = REX_W;                                    \
-    return asm_##mnemonic##_rm32_imm(self, (Reg32)reg, immediate);   \
-}
-
-DEFINE_INS_EXT_IMM(add, 0)
-DEFINE_INS_EXT_IMM(or, 1)
-DEFINE_INS_EXT_IMM(adc, 2)
-DEFINE_INS_EXT_IMM(sbb, 3)
-DEFINE_INS_EXT_IMM(and, 4)
-DEFINE_INS_EXT_IMM(sub, 5)
-DEFINE_INS_EXT_IMM(xor, 6)
-DEFINE_INS_EXT_IMM(cmp, 7)
-
-/*
-    /number
-    The number is called the extension, a number from 0 to 7;
-    It's a number used to extend the opcode type, since the instruction only uses
-    one register the other register can be encoded for that.
-*/
-#define DEFINE_INS_SHIFT_IMM8(mnemonic, extension)                  \
-int asm_##mnemonic##_rm32_imm(Asm *self, Reg32 reg, i8 immediate) { \
-    if(immediate == 1) {                                            \
-        return_if_error(asm_ensure_capacity(self, 2));              \
-        *self->code_it++ = 0xC1;                               \
-        *self->code_it++ = 0xC0 + 8*reg + extension;           \
-    } else {                                                        \
-        return_if_error(asm_ensure_capacity(self, 3));              \
-        *self->code_it++ = 0xD1;                               \
-        *self->code_it++ = 0xC0 + 8*reg + extension;           \
-        *self->code_it++ = immediate;                          \
-    }                                                               \
-    return 0;                                                       \
-}                                                                   \
-                                                                    \
-int asm_##mnemonic##_rm64_imm(Asm *self, Reg64 reg, i8 immediate) { \
-    return_if_error(asm_ensure_capacity(self, 1));                  \
-    *self->code_it++ = REX_W;                                   \
-    return asm_##mnemonic##_rm32_imm(self, (Reg32)reg, immediate);  \
-}
-
-DEFINE_INS_SHIFT_IMM8(rol, 0)
-DEFINE_INS_SHIFT_IMM8(ror, 1)
-DEFINE_INS_SHIFT_IMM8(rcl, 2)
-DEFINE_INS_SHIFT_IMM8(rcr, 3)
-DEFINE_INS_SHIFT_IMM8(shl, 4)
-DEFINE_INS_SHIFT_IMM8(shr, 5)
-/*DEFINE_INS_SHIFT_IMM8(shl, 6)*/
-DEFINE_INS_SHIFT_IMM8(sar, 7)
-
-int asm_ret(Asm *self, u16 bytes) {
-    if(bytes == 0) {
-        return_if_error(asm_ensure_capacity(self, 1));
-        *self->code_it++ = 0xC3;
-    } else {
-        return_if_error(asm_ensure_capacity(self, 3));
-        *self->code_it++ = 0xC2;
-        am_memcpy(self->code_it, &bytes, sizeof(bytes));
-    }
-    return 0;
-}