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x86_64-gen.c
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x86_64-gen.c
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/*
* x86-64 code generator for TCC
*
* Copyright (c) 2008 Shinichiro Hamaji
*
* Based on i386-gen.c by Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#如定义 TARGET_DEFS_ONLY
/* number of available registers */
#定义 NB_REGS 25
#定义 NB_ASM_REGS 16
#定义 CONFIG_TCC_ASM
/* a register can belong to several classes. The classes must be
sorted from more general to more precise (see gv2() code which does
assumptions on it). */
#定义 RC_INT 0x0001 /* generic integer register */
#定义 RC_FLOAT 0x0002 /* generic float register */
#定义 RC_RAX 0x0004
#定义 RC_RCX 0x0008
#定义 RC_RDX 0x0010
#定义 RC_ST0 0x0080 /* only for long double */
#定义 RC_R8 0x0100
#定义 RC_R9 0x0200
#定义 RC_R10 0x0400
#定义 RC_R11 0x0800
#定义 RC_XMM0 0x1000
#定义 RC_XMM1 0x2000
#定义 RC_XMM2 0x4000
#定义 RC_XMM3 0x8000
#定义 RC_XMM4 0x10000
#定义 RC_XMM5 0x20000
#定义 RC_XMM6 0x40000
#定义 RC_XMM7 0x80000
#定义 RC_IRET RC_RAX /* function return: integer register */
#定义 RC_LRET RC_RDX /* function return: second integer register */
#定义 RC_FRET RC_XMM0 /* function return: float register */
#定义 RC_QRET RC_XMM1 /* function return: second float register */
/* pretty names for the registers */
枚举 {
TREG_RAX = 0,
TREG_RCX = 1,
TREG_RDX = 2,
TREG_RSP = 4,
TREG_RSI = 6,
TREG_RDI = 7,
TREG_R8 = 8,
TREG_R9 = 9,
TREG_R10 = 10,
TREG_R11 = 11,
TREG_XMM0 = 16,
TREG_XMM1 = 17,
TREG_XMM2 = 18,
TREG_XMM3 = 19,
TREG_XMM4 = 20,
TREG_XMM5 = 21,
TREG_XMM6 = 22,
TREG_XMM7 = 23,
TREG_ST0 = 24,
TREG_MEM = 0x20
};
#定义 REX_BASE(reg) (((reg) >> 3) & 1)
#定义 REG_VALUE(reg) ((reg) & 7)
/* return registers for function */
#定义 REG_IRET TREG_RAX /* single word int return register */
#定义 REG_LRET TREG_RDX /* second word return register (for long long) */
#定义 REG_FRET TREG_XMM0 /* float return register */
#定义 REG_QRET TREG_XMM1 /* second float return register */
/* defined if function parameters must be evaluated in reverse order */
#定义 INVERT_FUNC_PARAMS
/* pointer size, in bytes */
#定义 PTR_SIZE 8
/* long double size and alignment, in bytes */
#定义 LDOUBLE_SIZE 16
#定义 LDOUBLE_ALIGN 16
/* maximum alignment (for aligned attribute support) */
#定义 MAX_ALIGN 16
/******************************************************/
#另 /* ! TARGET_DEFS_ONLY */
/******************************************************/
#包含 "tcc.h"
#包含 <assert.h>
ST_DATA 不变 整 reg_classes[NB_REGS] = {
/* eax */ RC_INT | RC_RAX,
/* ecx */ RC_INT | RC_RCX,
/* edx */ RC_INT | RC_RDX,
0,
0,
0,
0,
0,
RC_R8,
RC_R9,
RC_R10,
RC_R11,
0,
0,
0,
0,
/* xmm0 */ RC_FLOAT | RC_XMM0,
/* xmm1 */ RC_FLOAT | RC_XMM1,
/* xmm2 */ RC_FLOAT | RC_XMM2,
/* xmm3 */ RC_FLOAT | RC_XMM3,
/* xmm4 */ RC_FLOAT | RC_XMM4,
/* xmm5 */ RC_FLOAT | RC_XMM5,
/* xmm6 an xmm7 are included so gv() can be used on them,
but they are not tagged with RC_FLOAT because they are
callee saved on Windows */
RC_XMM6,
RC_XMM7,
/* st0 */ RC_ST0
};
静态 无符 长 func_sub_sp_offset;
静态 整 func_ret_sub;
/* XXX: make it faster ? */
ST_FUNC 空 g(整 c)
{
整 ind1;
如 (nocode_wanted)
返回;
ind1 = ind + 1;
如 (ind1 > cur_text_section->data_allocated)
section_realloc(cur_text_section, ind1);
cur_text_section->data[ind] = c;
ind = ind1;
}
ST_FUNC 空 o(无符 整 c)
{
当 (c) {
g(c);
c = c >> 8;
}
}
ST_FUNC 空 gen_le16(整 v)
{
g(v);
g(v >> 8);
}
ST_FUNC 空 gen_le32(整 c)
{
g(c);
g(c >> 8);
g(c >> 16);
g(c >> 24);
}
ST_FUNC 空 gen_le64(int64_t c)
{
g(c);
g(c >> 8);
g(c >> 16);
g(c >> 24);
g(c >> 32);
g(c >> 40);
g(c >> 48);
g(c >> 56);
}
静态 空 orex(整 ll, 整 r, 整 r2, 整 b)
{
如 ((r & VT_VALMASK) >= VT_CONST)
r = 0;
如 ((r2 & VT_VALMASK) >= VT_CONST)
r2 = 0;
如 (ll || REX_BASE(r) || REX_BASE(r2))
o(0x40 | REX_BASE(r) | (REX_BASE(r2) << 2) | (ll << 3));
o(b);
}
/* output a symbol and patch all calls to it */
ST_FUNC 空 gsym_addr(整 t, 整 a)
{
当 (t) {
无符 字 *ptr = cur_text_section->data + t;
uint32_t n = read32le(ptr); /* next value */
write32le(ptr, a - t - 4);
t = n;
}
}
空 gsym(整 t)
{
gsym_addr(t, ind);
}
静态 整 is64_type(整 t)
{
返回 ((t & VT_BTYPE) == VT_PTR ||
(t & VT_BTYPE) == VT_FUNC ||
(t & VT_BTYPE) == VT_LLONG);
}
/* instruction + 4 bytes data. Return the address of the data */
静态 整 oad(整 c, 整 s)
{
整 t;
如 (nocode_wanted)
返回 s;
o(c);
t = ind;
gen_le32(s);
返回 t;
}
/* generate jmp to a label */
#定义 gjmp2(instr,lbl) oad(instr,lbl)
ST_FUNC 空 gen_addr32(整 r, Sym *sym, 整 c)
{
如 (r & VT_SYM)
greloca(cur_text_section, sym, ind, R_X86_64_32S, c), c=0;
gen_le32(c);
}
/* output constant with relocation if 'r & VT_SYM' is true */
ST_FUNC 空 gen_addr64(整 r, Sym *sym, int64_t c)
{
如 (r & VT_SYM)
greloca(cur_text_section, sym, ind, R_X86_64_64, c), c=0;
gen_le64(c);
}
/* output constant with relocation if 'r & VT_SYM' is true */
ST_FUNC 空 gen_addrpc32(整 r, Sym *sym, 整 c)
{
如 (r & VT_SYM)
greloca(cur_text_section, sym, ind, R_X86_64_PC32, c-4), c=4;
gen_le32(c-4);
}
/* output got address with relocation */
静态 空 gen_gotpcrel(整 r, Sym *sym, 整 c)
{
#如定义 TCC_TARGET_PE
tcc_error("internal error: no GOT on PE: %s %x %x | %02x %02x %02x\n",
get_tok_str(sym->v, NULL), c, r,
cur_text_section->data[ind-3],
cur_text_section->data[ind-2],
cur_text_section->data[ind-1]
);
#了如
greloca(cur_text_section, sym, ind, R_X86_64_GOTPCREL, -4);
gen_le32(0);
如 (c) {
/* we use add c, %xxx for displacement */
orex(1, r, 0, 0x81);
o(0xc0 + REG_VALUE(r));
gen_le32(c);
}
}
静态 空 gen_modrm_impl(整 op_reg, 整 r, Sym *sym, 整 c, 整 is_got)
{
op_reg = REG_VALUE(op_reg) << 3;
如 ((r & VT_VALMASK) == VT_CONST) {
/* constant memory reference */
o(0x05 | op_reg);
如 (is_got) {
gen_gotpcrel(r, sym, c);
} 另 {
gen_addrpc32(r, sym, c);
}
} 另 如 ((r & VT_VALMASK) == VT_LOCAL) {
/* currently, we use only ebp as base */
如 (c == (字)c) {
/* short reference */
o(0x45 | op_reg);
g(c);
} 另 {
oad(0x85 | op_reg, c);
}
} 另 如 ((r & VT_VALMASK) >= TREG_MEM) {
如 (c) {
g(0x80 | op_reg | REG_VALUE(r));
gen_le32(c);
} 另 {
g(0x00 | op_reg | REG_VALUE(r));
}
} 另 {
g(0x00 | op_reg | REG_VALUE(r));
}
}
/* generate a modrm reference. 'op_reg' contains the addtional 3
opcode bits */
静态 空 gen_modrm(整 op_reg, 整 r, Sym *sym, 整 c)
{
gen_modrm_impl(op_reg, r, sym, c, 0);
}
/* generate a modrm reference. 'op_reg' contains the addtional 3
opcode bits */
静态 空 gen_modrm64(整 opcode, 整 op_reg, 整 r, Sym *sym, 整 c)
{
整 is_got;
is_got = (op_reg & TREG_MEM) && !(sym->type.t & VT_STATIC);
orex(1, r, op_reg, opcode);
gen_modrm_impl(op_reg, r, sym, c, is_got);
}
/* load 'r' from value 'sv' */
空 load(整 r, SValue *sv)
{
整 v, t, ft, fc, fr;
SValue v1;
#如定义 TCC_TARGET_PE
SValue v2;
sv = pe_getimport(sv, &v2);
#了如
fr = sv->r;
ft = sv->type.t & ~VT_DEFSIGN;
fc = sv->c.i;
如 (fc != sv->c.i && (fr & VT_SYM))
tcc_error("64 bit addend in load");
ft &= ~(VT_VOLATILE | VT_CONSTANT);
#如未定义 TCC_TARGET_PE
/* we use indirect access via got */
如 ((fr & VT_VALMASK) == VT_CONST && (fr & VT_SYM) &&
(fr & VT_LVAL) && !(sv->sym->type.t & VT_STATIC)) {
/* use the result register as a temporal register */
整 tr = r | TREG_MEM;
如 (is_float(ft)) {
/* we cannot use float registers as a temporal register */
tr = get_reg(RC_INT) | TREG_MEM;
}
gen_modrm64(0x8b, tr, fr, sv->sym, 0);
/* load from the temporal register */
fr = tr | VT_LVAL;
}
#了如
v = fr & VT_VALMASK;
如 (fr & VT_LVAL) {
整 b, ll;
如 (v == VT_LLOCAL) {
v1.type.t = VT_PTR;
v1.r = VT_LOCAL | VT_LVAL;
v1.c.i = fc;
fr = r;
如 (!(reg_classes[fr] & (RC_INT|RC_R11)))
fr = get_reg(RC_INT);
load(fr, &v1);
}
ll = 0;
/* Like GCC we can load from small enough properly sized
structs and unions as well.
XXX maybe move to generic operand handling, but should
occur only with asm, so tccasm.c might also be a better place */
如 ((ft & VT_BTYPE) == VT_STRUCT) {
整 align;
转接 (type_size(&sv->type, &align)) {
事例 1: ft = VT_BYTE; 跳出;
事例 2: ft = VT_SHORT; 跳出;
事例 4: ft = VT_INT; 跳出;
事例 8: ft = VT_LLONG; 跳出;
缺省:
tcc_error("invalid aggregate type for register load");
跳出;
}
}
如 ((ft & VT_BTYPE) == VT_FLOAT) {
b = 0x6e0f66;
r = REG_VALUE(r); /* movd */
} 另 如 ((ft & VT_BTYPE) == VT_DOUBLE) {
b = 0x7e0ff3; /* movq */
r = REG_VALUE(r);
} 另 如 ((ft & VT_BTYPE) == VT_LDOUBLE) {
b = 0xdb, r = 5; /* fldt */
} 另 如 ((ft & VT_TYPE) == VT_BYTE || (ft & VT_TYPE) == VT_BOOL) {
b = 0xbe0f; /* movsbl */
} 另 如 ((ft & VT_TYPE) == (VT_BYTE | VT_UNSIGNED)) {
b = 0xb60f; /* movzbl */
} 另 如 ((ft & VT_TYPE) == VT_SHORT) {
b = 0xbf0f; /* movswl */
} 另 如 ((ft & VT_TYPE) == (VT_SHORT | VT_UNSIGNED)) {
b = 0xb70f; /* movzwl */
} 另 {
assert(((ft & VT_BTYPE) == VT_INT)
|| ((ft & VT_BTYPE) == VT_LLONG)
|| ((ft & VT_BTYPE) == VT_PTR)
|| ((ft & VT_BTYPE) == VT_FUNC)
);
ll = is64_type(ft);
b = 0x8b;
}
如 (ll) {
gen_modrm64(b, r, fr, sv->sym, fc);
} 另 {
orex(ll, fr, r, b);
gen_modrm(r, fr, sv->sym, fc);
}
} 另 {
如 (v == VT_CONST) {
如 (fr & VT_SYM) {
#如定义 TCC_TARGET_PE
orex(1,0,r,0x8d);
o(0x05 + REG_VALUE(r) * 8); /* lea xx(%rip), r */
gen_addrpc32(fr, sv->sym, fc);
#另
如 (sv->sym->type.t & VT_STATIC) {
orex(1,0,r,0x8d);
o(0x05 + REG_VALUE(r) * 8); /* lea xx(%rip), r */
gen_addrpc32(fr, sv->sym, fc);
} 另 {
orex(1,0,r,0x8b);
o(0x05 + REG_VALUE(r) * 8); /* mov xx(%rip), r */
gen_gotpcrel(r, sv->sym, fc);
}
#了如
} 另 如 (is64_type(ft)) {
orex(1,r,0, 0xb8 + REG_VALUE(r)); /* mov $xx, r */
gen_le64(sv->c.i);
} 另 {
orex(0,r,0, 0xb8 + REG_VALUE(r)); /* mov $xx, r */
gen_le32(fc);
}
} 另 如 (v == VT_LOCAL) {
orex(1,0,r,0x8d); /* lea xxx(%ebp), r */
gen_modrm(r, VT_LOCAL, sv->sym, fc);
} 另 如 (v == VT_CMP) {
orex(0,r,0,0);
如 ((fc & ~0x100) != TOK_NE)
oad(0xb8 + REG_VALUE(r), 0); /* mov $0, r */
另
oad(0xb8 + REG_VALUE(r), 1); /* mov $1, r */
如 (fc & 0x100)
{
/* This was a float compare. If the parity bit is
set the result was unordered, meaning false for everything
except TOK_NE, and true for TOK_NE. */
fc &= ~0x100;
o(0x037a + (REX_BASE(r) << 8));
}
orex(0,r,0, 0x0f); /* setxx %br */
o(fc);
o(0xc0 + REG_VALUE(r));
} 另 如 (v == VT_JMP || v == VT_JMPI) {
t = v & 1;
orex(0,r,0,0);
oad(0xb8 + REG_VALUE(r), t); /* mov $1, r */
o(0x05eb + (REX_BASE(r) << 8)); /* jmp after */
gsym(fc);
orex(0,r,0,0);
oad(0xb8 + REG_VALUE(r), t ^ 1); /* mov $0, r */
} 另 如 (v != r) {
如 ((r >= TREG_XMM0) && (r <= TREG_XMM7)) {
如 (v == TREG_ST0) {
/* gen_cvt_ftof(VT_DOUBLE); */
o(0xf0245cdd); /* fstpl -0x10(%rsp) */
/* movsd -0x10(%rsp),%xmmN */
o(0x100ff2);
o(0x44 + REG_VALUE(r)*8); /* %xmmN */
o(0xf024);
} 另 {
assert((v >= TREG_XMM0) && (v <= TREG_XMM7));
如 ((ft & VT_BTYPE) == VT_FLOAT) {
o(0x100ff3);
} 另 {
assert((ft & VT_BTYPE) == VT_DOUBLE);
o(0x100ff2);
}
o(0xc0 + REG_VALUE(v) + REG_VALUE(r)*8);
}
} 另 如 (r == TREG_ST0) {
assert((v >= TREG_XMM0) && (v <= TREG_XMM7));
/* gen_cvt_ftof(VT_LDOUBLE); */
/* movsd %xmmN,-0x10(%rsp) */
o(0x110ff2);
o(0x44 + REG_VALUE(r)*8); /* %xmmN */
o(0xf024);
o(0xf02444dd); /* fldl -0x10(%rsp) */
} 另 {
orex(1,r,v, 0x89);
o(0xc0 + REG_VALUE(r) + REG_VALUE(v) * 8); /* mov v, r */
}
}
}
}
/* store register 'r' in lvalue 'v' */
空 store(整 r, SValue *v)
{
整 fr, bt, ft, fc;
整 op64 = 0;
/* store the REX prefix in this variable when PIC is enabled */
整 pic = 0;
#如定义 TCC_TARGET_PE
SValue v2;
v = pe_getimport(v, &v2);
#了如
fr = v->r & VT_VALMASK;
ft = v->type.t;
fc = v->c.i;
如 (fc != v->c.i && (fr & VT_SYM))
tcc_error("64 bit addend in store");
ft &= ~(VT_VOLATILE | VT_CONSTANT);
bt = ft & VT_BTYPE;
#如未定义 TCC_TARGET_PE
/* we need to access the variable via got */
如 (fr == VT_CONST && (v->r & VT_SYM)) {
/* mov xx(%rip), %r11 */
o(0x1d8b4c);
gen_gotpcrel(TREG_R11, v->sym, v->c.i);
pic = is64_type(bt) ? 0x49 : 0x41;
}
#了如
/* XXX: incorrect if float reg to reg */
如 (bt == VT_FLOAT) {
o(0x66);
o(pic);
o(0x7e0f); /* movd */
r = REG_VALUE(r);
} 另 如 (bt == VT_DOUBLE) {
o(0x66);
o(pic);
o(0xd60f); /* movq */
r = REG_VALUE(r);
} 另 如 (bt == VT_LDOUBLE) {
o(0xc0d9); /* fld %st(0) */
o(pic);
o(0xdb); /* fstpt */
r = 7;
} 另 {
如 (bt == VT_SHORT)
o(0x66);
o(pic);
如 (bt == VT_BYTE || bt == VT_BOOL)
orex(0, 0, r, 0x88);
另 如 (is64_type(bt))
op64 = 0x89;
另
orex(0, 0, r, 0x89);
}
如 (pic) {
/* xxx r, (%r11) where xxx is mov, movq, fld, or etc */
如 (op64)
o(op64);
o(3 + (r << 3));
} 另 如 (op64) {
如 (fr == VT_CONST || fr == VT_LOCAL || (v->r & VT_LVAL)) {
gen_modrm64(op64, r, v->r, v->sym, fc);
} 另 如 (fr != r) {
/* XXX: don't we really come here? */
abort();
o(0xc0 + fr + r * 8); /* mov r, fr */
}
} 另 {
如 (fr == VT_CONST || fr == VT_LOCAL || (v->r & VT_LVAL)) {
gen_modrm(r, v->r, v->sym, fc);
} 另 如 (fr != r) {
/* XXX: don't we really come here? */
abort();
o(0xc0 + fr + r * 8); /* mov r, fr */
}
}
}
/* 'is_jmp' is '1' if it is a jump */
静态 空 gcall_or_jmp(整 is_jmp)
{
整 r;
如 ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST &&
((vtop->r & VT_SYM) || (vtop->c.i-4) == (整)(vtop->c.i-4))) {
/* constant case */
如 (vtop->r & VT_SYM) {
/* relocation case */
#如定义 TCC_TARGET_PE
greloca(cur_text_section, vtop->sym, ind + 1, R_X86_64_PC32, (整)(vtop->c.i-4));
#另
greloca(cur_text_section, vtop->sym, ind + 1, R_X86_64_PLT32, (整)(vtop->c.i-4));
#了如
} 另 {
/* put an empty PC32 relocation */
put_elf_reloca(symtab_section, cur_text_section,
ind + 1, R_X86_64_PC32, 0, (整)(vtop->c.i-4));
}
oad(0xe8 + is_jmp, 0); /* call/jmp im */
} 另 {
/* otherwise, indirect call */
r = TREG_R11;
load(r, vtop);
o(0x41); /* REX */
o(0xff); /* call/jmp *r */
o(0xd0 + REG_VALUE(r) + (is_jmp << 4));
}
}
#如 已定义(CONFIG_TCC_BCHECK)
#如未定义 TCC_TARGET_PE
静态 addr_t func_bound_offset;
静态 无符 长 func_bound_ind;
#了如
静态 空 gen_static_call(整 v)
{
Sym *sym = external_global_sym(v, &func_old_type, 0);
oad(0xe8, 0);
greloca(cur_text_section, sym, ind-4, R_X86_64_PC32, -4);
}
/* generate a bounded pointer addition */
ST_FUNC 空 gen_bounded_ptr_add(空)
{
/* save all temporary registers */
save_regs(0);
/* prepare fast x86_64 function call */
gv(RC_RAX);
o(0xc68948); // mov %rax,%rsi ## second arg in %rsi, this must be size
vtop--;
gv(RC_RAX);
o(0xc78948); // mov %rax,%rdi ## first arg in %rdi, this must be ptr
vtop--;
/* do a fast function call */
gen_static_call(TOK___bound_ptr_add);
/* returned pointer is in rax */
vtop++;
vtop->r = TREG_RAX | VT_BOUNDED;
/* relocation offset of the bounding function call point */
vtop->c.i = (cur_text_section->reloc->data_offset - 求长度(ElfW(Rela)));
}
/* patch pointer addition in vtop so that pointer dereferencing is
also tested */
ST_FUNC 空 gen_bounded_ptr_deref(空)
{
addr_t func;
整 size, align;
ElfW(Rela) *rel;
Sym *sym;
size = 0;
/* XXX: put that code in generic part of tcc */
如 (!is_float(vtop->type.t)) {
如 (vtop->r & VT_LVAL_BYTE)
size = 1;
另 如 (vtop->r & VT_LVAL_SHORT)
size = 2;
}
如 (!size)
size = type_size(&vtop->type, &align);
转接(size) {
事例 1: func = TOK___bound_ptr_indir1; 跳出;
事例 2: func = TOK___bound_ptr_indir2; 跳出;
事例 4: func = TOK___bound_ptr_indir4; 跳出;
事例 8: func = TOK___bound_ptr_indir8; 跳出;
事例 12: func = TOK___bound_ptr_indir12; 跳出;
事例 16: func = TOK___bound_ptr_indir16; 跳出;
缺省:
tcc_error("unhandled size when dereferencing bounded pointer");
func = 0;
跳出;
}
sym = external_global_sym(func, &func_old_type, 0);
如 (!sym->c)
put_extern_sym(sym, NULL, 0, 0);
/* patch relocation */
/* XXX: find a better solution ? */
rel = (ElfW(Rela) *)(cur_text_section->reloc->data + vtop->c.i);
rel->r_info = ELF64_R_INFO(sym->c, ELF64_R_TYPE(rel->r_info));
}
#了如
#如定义 TCC_TARGET_PE
#定义 REGN 4
静态 不变 uint8_t arg_regs[REGN] = {
TREG_RCX, TREG_RDX, TREG_R8, TREG_R9
};
/* Prepare arguments in R10 and R11 rather than RCX and RDX
because gv() will not ever use these */
静态 整 arg_prepare_reg(整 idx) {
如 (idx == 0 || idx == 1)
/* idx=0: r10, idx=1: r11 */
返回 idx + 10;
另
返回 arg_regs[idx];
}
静态 整 func_scratch, func_alloca;
/* Generate function call. The function address is pushed first, then
all the parameters in call order. This functions pops all the
parameters and the function address. */
静态 空 gen_offs_sp(整 b, 整 r, 整 d)
{
orex(1,0,r & 0x100 ? 0 : r, b);
如 (d == (字)d) {
o(0x2444 | (REG_VALUE(r) << 3));
g(d);
} 另 {
o(0x2484 | (REG_VALUE(r) << 3));
gen_le32(d);
}
}
静态 整 using_regs(整 size)
{
返回 !(size > 8 || (size & (size - 1)));
}
/* Return the number of registers needed to return the struct, or 0 if
returning via struct pointer. */
ST_FUNC 整 gfunc_sret(CType *vt, 整 variadic, CType *ret, 整 *ret_align, 整 *regsize)
{
整 size, align;
*ret_align = 1; // Never have to re-align return values for x86-64
*regsize = 8;
size = type_size(vt, &align);
如 (!using_regs(size))
返回 0;
如 (size == 8)
ret->t = VT_LLONG;
另 如 (size == 4)
ret->t = VT_INT;
另 如 (size == 2)
ret->t = VT_SHORT;
另
ret->t = VT_BYTE;
ret->ref = NULL;
返回 1;
}
静态 整 is_sse_float(整 t) {
整 bt;
bt = t & VT_BTYPE;
返回 bt == VT_DOUBLE || bt == VT_FLOAT;
}
静态 整 gfunc_arg_size(CType *type) {
整 align;
如 (type->t & (VT_ARRAY|VT_BITFIELD))
返回 8;
返回 type_size(type, &align);
}
空 gfunc_call(整 nb_args)
{
整 size, r, args_size, i, d, bt, struct_size;
整 arg;
args_size = (nb_args < REGN ? REGN : nb_args) * PTR_SIZE;
arg = nb_args;
/* for struct arguments, we need to call memcpy and the function
call breaks register passing arguments we are preparing.
So, we process arguments which will be passed by stack first. */
struct_size = args_size;
对于(i = 0; i < nb_args; i++) {
SValue *sv;
--arg;
sv = &vtop[-i];
bt = (sv->type.t & VT_BTYPE);
size = gfunc_arg_size(&sv->type);
如 (using_regs(size))
继续; /* arguments smaller than 8 bytes passed in registers or on stack */
如 (bt == VT_STRUCT) {
/* align to stack align size */
size = (size + 15) & ~15;
/* generate structure store */
r = get_reg(RC_INT);
gen_offs_sp(0x8d, r, struct_size);
struct_size += size;
/* generate memcpy call */
vset(&sv->type, r | VT_LVAL, 0);
vpushv(sv);
vstore();
--vtop;
} 另 如 (bt == VT_LDOUBLE) {
gv(RC_ST0);
gen_offs_sp(0xdb, 0x107, struct_size);
struct_size += 16;
}
}
如 (func_scratch < struct_size)
func_scratch = struct_size;
arg = nb_args;
struct_size = args_size;
对于(i = 0; i < nb_args; i++) {
--arg;
bt = (vtop->type.t & VT_BTYPE);
size = gfunc_arg_size(&vtop->type);
如 (!using_regs(size)) {
/* align to stack align size */
size = (size + 15) & ~15;
如 (arg >= REGN) {
d = get_reg(RC_INT);
gen_offs_sp(0x8d, d, struct_size);
gen_offs_sp(0x89, d, arg*8);
} 另 {
d = arg_prepare_reg(arg);
gen_offs_sp(0x8d, d, struct_size);
}
struct_size += size;
} 另 {
如 (is_sse_float(vtop->type.t)) {
如 (tcc_state->nosse)
tcc_error("SSE disabled");
gv(RC_XMM0); /* only use one float register */
如 (arg >= REGN) {
/* movq %xmm0, j*8(%rsp) */
gen_offs_sp(0xd60f66, 0x100, arg*8);
} 另 {
/* movaps %xmm0, %xmmN */
o(0x280f);
o(0xc0 + (arg << 3));
d = arg_prepare_reg(arg);
/* mov %xmm0, %rxx */
o(0x66);
orex(1,d,0, 0x7e0f);
o(0xc0 + REG_VALUE(d));
}
} 另 {
如 (bt == VT_STRUCT) {
vtop->type.ref = NULL;
vtop->type.t = size > 4 ? VT_LLONG : size > 2 ? VT_INT
: size > 1 ? VT_SHORT : VT_BYTE;
}
r = gv(RC_INT);
如 (arg >= REGN) {
gen_offs_sp(0x89, r, arg*8);
} 另 {
d = arg_prepare_reg(arg);
orex(1,d,r,0x89); /* mov */
o(0xc0 + REG_VALUE(r) * 8 + REG_VALUE(d));
}
}
}
vtop--;
}
save_regs(0);
/* Copy R10 and R11 into RCX and RDX, respectively */
如 (nb_args > 0) {
o(0xd1894c); /* mov %r10, %rcx */
如 (nb_args > 1) {
o(0xda894c); /* mov %r11, %rdx */
}
}
gcall_or_jmp(0);
如 ((vtop->r & VT_SYM) && vtop->sym->v == TOK_alloca) {
/* need to add the "func_scratch" area after alloca */
o(0x0548), gen_le32(func_alloca), func_alloca = ind - 4;
}
/* other compilers don't clear the upper bits when returning char/short */
bt = vtop->type.ref->type.t & (VT_BTYPE | VT_UNSIGNED);
如 (bt == (VT_BYTE | VT_UNSIGNED))
o(0xc0b60f); /* movzbl %al, %eax */
另 如 (bt == VT_BYTE)
o(0xc0be0f); /* movsbl %al, %eax */
另 如 (bt == VT_SHORT)
o(0x98); /* cwtl */
另 如 (bt == (VT_SHORT | VT_UNSIGNED))
o(0xc0b70f); /* movzbl %al, %eax */
#如 0 /* handled in gen_cast() */
另 如 (bt == VT_INT)
o(0x9848); /* cltq */
另 如 (bt == (VT_INT | VT_UNSIGNED))
o(0xc089); /* mov %eax,%eax */
#了如
vtop--;
}
#定义 FUNC_PROLOG_SIZE 11
/* generate function prolog of type 't' */
空 gfunc_prolog(CType *func_type)
{
整 addr, reg_param_index, bt, size;
Sym *sym;
CType *type;
func_ret_sub = 0;
func_scratch = 0;
func_alloca = 0;
loc = 0;
addr = PTR_SIZE * 2;
ind += FUNC_PROLOG_SIZE;
func_sub_sp_offset = ind;
reg_param_index = 0;
sym = func_type->ref;
/* if the function returns a structure, then add an
implicit pointer parameter */
func_vt = sym->type;
func_var = (sym->f.func_type == FUNC_ELLIPSIS);
size = gfunc_arg_size(&func_vt);
如 (!using_regs(size)) {
gen_modrm64(0x89, arg_regs[reg_param_index], VT_LOCAL, NULL, addr);
func_vc = addr;
reg_param_index++;
addr += 8;
}
/* define parameters */
当 ((sym = sym->next) != NULL) {
type = &sym->type;
bt = type->t & VT_BTYPE;
size = gfunc_arg_size(type);
如 (!using_regs(size)) {
如 (reg_param_index < REGN) {
gen_modrm64(0x89, arg_regs[reg_param_index], VT_LOCAL, NULL, addr);
}
sym_push(sym->v & ~SYM_FIELD, type, VT_LLOCAL | VT_LVAL, addr);
} 另 {
如 (reg_param_index < REGN) {
/* save arguments passed by register */
如 ((bt == VT_FLOAT) || (bt == VT_DOUBLE)) {
如 (tcc_state->nosse)
tcc_error("SSE disabled");
o(0xd60f66); /* movq */
gen_modrm(reg_param_index, VT_LOCAL, NULL, addr);
} 另 {
gen_modrm64(0x89, arg_regs[reg_param_index], VT_LOCAL, NULL, addr);
}
}
sym_push(sym->v & ~SYM_FIELD, type, VT_LOCAL | VT_LVAL, addr);
}
addr += 8;
reg_param_index++;
}
当 (reg_param_index < REGN) {
如 (func_type->ref->f.func_type == FUNC_ELLIPSIS) {
gen_modrm64(0x89, arg_regs[reg_param_index], VT_LOCAL, NULL, addr);
addr += 8;
}
reg_param_index++;
}
}