/
mini-x86.c
5963 lines (5353 loc) · 169 KB
/
mini-x86.c
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/*
* mini-x86.c: x86 backend for the Mono code generator
*
* Authors:
* Paolo Molaro (lupus@ximian.com)
* Dietmar Maurer (dietmar@ximian.com)
* Patrik Torstensson
*
* (C) 2003 Ximian, Inc.
*/
#include "mini.h"
#include <string.h>
#include <math.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <mono/metadata/appdomain.h>
#include <mono/metadata/debug-helpers.h>
#include <mono/metadata/threads.h>
#include <mono/metadata/profiler-private.h>
#include <mono/metadata/mono-debug.h>
#include <mono/utils/mono-math.h>
#include <mono/utils/mono-counters.h>
#include <mono/utils/mono-mmap.h>
#include "trace.h"
#include "mini-x86.h"
#include "cpu-x86.h"
#include "ir-emit.h"
/* On windows, these hold the key returned by TlsAlloc () */
static gint lmf_tls_offset = -1;
static gint lmf_addr_tls_offset = -1;
static gint appdomain_tls_offset = -1;
#ifdef MONO_XEN_OPT
static gboolean optimize_for_xen = TRUE;
#else
#define optimize_for_xen 0
#endif
#ifdef TARGET_WIN32
static gboolean is_win32 = TRUE;
#else
static gboolean is_win32 = FALSE;
#endif
/* This mutex protects architecture specific caches */
#define mono_mini_arch_lock() EnterCriticalSection (&mini_arch_mutex)
#define mono_mini_arch_unlock() LeaveCriticalSection (&mini_arch_mutex)
static CRITICAL_SECTION mini_arch_mutex;
#define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
#define ARGS_OFFSET 8
#ifdef TARGET_WIN32
/* Under windows, the default pinvoke calling convention is stdcall */
#define CALLCONV_IS_STDCALL(sig) ((((sig)->call_convention) == MONO_CALL_STDCALL) || ((sig)->pinvoke && ((sig)->call_convention) == MONO_CALL_DEFAULT))
#else
#define CALLCONV_IS_STDCALL(sig) (((sig)->call_convention) == MONO_CALL_STDCALL)
#endif
MonoBreakpointInfo
mono_breakpoint_info [MONO_BREAKPOINT_ARRAY_SIZE];
/*
* The code generated for sequence points reads from this location, which is
* made read-only when single stepping is enabled.
*/
static gpointer ss_trigger_page;
/* Enabled breakpoints read from this trigger page */
static gpointer bp_trigger_page;
const char*
mono_arch_regname (int reg)
{
switch (reg) {
case X86_EAX: return "%eax";
case X86_EBX: return "%ebx";
case X86_ECX: return "%ecx";
case X86_EDX: return "%edx";
case X86_ESP: return "%esp";
case X86_EBP: return "%ebp";
case X86_EDI: return "%edi";
case X86_ESI: return "%esi";
}
return "unknown";
}
const char*
mono_arch_fregname (int reg)
{
switch (reg) {
case 0:
return "%fr0";
case 1:
return "%fr1";
case 2:
return "%fr2";
case 3:
return "%fr3";
case 4:
return "%fr4";
case 5:
return "%fr5";
case 6:
return "%fr6";
case 7:
return "%fr7";
default:
return "unknown";
}
}
const char *
mono_arch_xregname (int reg)
{
switch (reg) {
case 0:
return "%xmm0";
case 1:
return "%xmm1";
case 2:
return "%xmm2";
case 3:
return "%xmm3";
case 4:
return "%xmm4";
case 5:
return "%xmm5";
case 6:
return "%xmm6";
case 7:
return "%xmm7";
default:
return "unknown";
}
}
typedef enum {
ArgInIReg,
ArgInFloatSSEReg,
ArgInDoubleSSEReg,
ArgOnStack,
ArgValuetypeInReg,
ArgOnFloatFpStack,
ArgOnDoubleFpStack,
ArgNone
} ArgStorage;
typedef struct {
gint16 offset;
gint8 reg;
ArgStorage storage;
/* Only if storage == ArgValuetypeInReg */
ArgStorage pair_storage [2];
gint8 pair_regs [2];
} ArgInfo;
typedef struct {
int nargs;
guint32 stack_usage;
guint32 reg_usage;
guint32 freg_usage;
gboolean need_stack_align;
guint32 stack_align_amount;
ArgInfo ret;
ArgInfo sig_cookie;
ArgInfo args [1];
} CallInfo;
#define PARAM_REGS 0
#define FLOAT_PARAM_REGS 0
static X86_Reg_No param_regs [] = { 0 };
#if defined(TARGET_WIN32) || defined(__APPLE__) || defined(__FreeBSD__)
#define SMALL_STRUCTS_IN_REGS
static X86_Reg_No return_regs [] = { X86_EAX, X86_EDX };
#endif
static void inline
add_general (guint32 *gr, guint32 *stack_size, ArgInfo *ainfo)
{
ainfo->offset = *stack_size;
if (*gr >= PARAM_REGS) {
ainfo->storage = ArgOnStack;
(*stack_size) += sizeof (gpointer);
}
else {
ainfo->storage = ArgInIReg;
ainfo->reg = param_regs [*gr];
(*gr) ++;
}
}
static void inline
add_general_pair (guint32 *gr, guint32 *stack_size, ArgInfo *ainfo)
{
ainfo->offset = *stack_size;
g_assert (PARAM_REGS == 0);
ainfo->storage = ArgOnStack;
(*stack_size) += sizeof (gpointer) * 2;
}
static void inline
add_float (guint32 *gr, guint32 *stack_size, ArgInfo *ainfo, gboolean is_double)
{
ainfo->offset = *stack_size;
if (*gr >= FLOAT_PARAM_REGS) {
ainfo->storage = ArgOnStack;
(*stack_size) += is_double ? 8 : 4;
}
else {
/* A double register */
if (is_double)
ainfo->storage = ArgInDoubleSSEReg;
else
ainfo->storage = ArgInFloatSSEReg;
ainfo->reg = *gr;
(*gr) += 1;
}
}
static void
add_valuetype (MonoGenericSharingContext *gsctx, MonoMethodSignature *sig, ArgInfo *ainfo, MonoType *type,
gboolean is_return,
guint32 *gr, guint32 *fr, guint32 *stack_size)
{
guint32 size;
MonoClass *klass;
klass = mono_class_from_mono_type (type);
size = mini_type_stack_size_full (gsctx, &klass->byval_arg, NULL, sig->pinvoke);
#ifdef SMALL_STRUCTS_IN_REGS
if (sig->pinvoke && is_return) {
MonoMarshalType *info;
/*
* the exact rules are not very well documented, the code below seems to work with the
* code generated by gcc 3.3.3 -mno-cygwin.
*/
info = mono_marshal_load_type_info (klass);
g_assert (info);
ainfo->pair_storage [0] = ainfo->pair_storage [1] = ArgNone;
/* Special case structs with only a float member */
if ((info->native_size == 8) && (info->num_fields == 1) && (info->fields [0].field->type->type == MONO_TYPE_R8)) {
ainfo->storage = ArgValuetypeInReg;
ainfo->pair_storage [0] = ArgOnDoubleFpStack;
return;
}
if ((info->native_size == 4) && (info->num_fields == 1) && (info->fields [0].field->type->type == MONO_TYPE_R4)) {
ainfo->storage = ArgValuetypeInReg;
ainfo->pair_storage [0] = ArgOnFloatFpStack;
return;
}
if ((info->native_size == 1) || (info->native_size == 2) || (info->native_size == 4) || (info->native_size == 8)) {
ainfo->storage = ArgValuetypeInReg;
ainfo->pair_storage [0] = ArgInIReg;
ainfo->pair_regs [0] = return_regs [0];
if (info->native_size > 4) {
ainfo->pair_storage [1] = ArgInIReg;
ainfo->pair_regs [1] = return_regs [1];
}
return;
}
}
#endif
ainfo->offset = *stack_size;
ainfo->storage = ArgOnStack;
*stack_size += ALIGN_TO (size, sizeof (gpointer));
}
/*
* get_call_info:
*
* Obtain information about a call according to the calling convention.
* For x86 ELF, see the "System V Application Binary Interface Intel386
* Architecture Processor Supplment, Fourth Edition" document for more
* information.
* For x86 win32, see ???.
*/
static CallInfo*
get_call_info_internal (MonoGenericSharingContext *gsctx, CallInfo *cinfo, MonoMethodSignature *sig, gboolean is_pinvoke)
{
guint32 i, gr, fr;
MonoType *ret_type;
int n = sig->hasthis + sig->param_count;
guint32 stack_size = 0;
gr = 0;
fr = 0;
/* return value */
{
ret_type = mini_type_get_underlying_type (gsctx, sig->ret);
switch (ret_type->type) {
case MONO_TYPE_BOOLEAN:
case MONO_TYPE_I1:
case MONO_TYPE_U1:
case MONO_TYPE_I2:
case MONO_TYPE_U2:
case MONO_TYPE_CHAR:
case MONO_TYPE_I4:
case MONO_TYPE_U4:
case MONO_TYPE_I:
case MONO_TYPE_U:
case MONO_TYPE_PTR:
case MONO_TYPE_FNPTR:
case MONO_TYPE_CLASS:
case MONO_TYPE_OBJECT:
case MONO_TYPE_SZARRAY:
case MONO_TYPE_ARRAY:
case MONO_TYPE_STRING:
cinfo->ret.storage = ArgInIReg;
cinfo->ret.reg = X86_EAX;
break;
case MONO_TYPE_U8:
case MONO_TYPE_I8:
cinfo->ret.storage = ArgInIReg;
cinfo->ret.reg = X86_EAX;
break;
case MONO_TYPE_R4:
cinfo->ret.storage = ArgOnFloatFpStack;
break;
case MONO_TYPE_R8:
cinfo->ret.storage = ArgOnDoubleFpStack;
break;
case MONO_TYPE_GENERICINST:
if (!mono_type_generic_inst_is_valuetype (ret_type)) {
cinfo->ret.storage = ArgInIReg;
cinfo->ret.reg = X86_EAX;
break;
}
/* Fall through */
case MONO_TYPE_VALUETYPE: {
guint32 tmp_gr = 0, tmp_fr = 0, tmp_stacksize = 0;
add_valuetype (gsctx, sig, &cinfo->ret, sig->ret, TRUE, &tmp_gr, &tmp_fr, &tmp_stacksize);
if (cinfo->ret.storage == ArgOnStack)
/* The caller passes the address where the value is stored */
add_general (&gr, &stack_size, &cinfo->ret);
break;
}
case MONO_TYPE_TYPEDBYREF:
/* Same as a valuetype with size 24 */
add_general (&gr, &stack_size, &cinfo->ret);
;
break;
case MONO_TYPE_VOID:
cinfo->ret.storage = ArgNone;
break;
default:
g_error ("Can't handle as return value 0x%x", sig->ret->type);
}
}
/* this */
if (sig->hasthis)
add_general (&gr, &stack_size, cinfo->args + 0);
if (!sig->pinvoke && (sig->call_convention == MONO_CALL_VARARG) && (n == 0)) {
gr = PARAM_REGS;
fr = FLOAT_PARAM_REGS;
/* Emit the signature cookie just before the implicit arguments */
add_general (&gr, &stack_size, &cinfo->sig_cookie);
}
for (i = 0; i < sig->param_count; ++i) {
ArgInfo *ainfo = &cinfo->args [sig->hasthis + i];
MonoType *ptype;
if (!sig->pinvoke && (sig->call_convention == MONO_CALL_VARARG) && (i == sig->sentinelpos)) {
/* We allways pass the sig cookie on the stack for simplicity */
/*
* Prevent implicit arguments + the sig cookie from being passed
* in registers.
*/
gr = PARAM_REGS;
fr = FLOAT_PARAM_REGS;
/* Emit the signature cookie just before the implicit arguments */
add_general (&gr, &stack_size, &cinfo->sig_cookie);
}
if (sig->params [i]->byref) {
add_general (&gr, &stack_size, ainfo);
continue;
}
ptype = mini_type_get_underlying_type (gsctx, sig->params [i]);
switch (ptype->type) {
case MONO_TYPE_BOOLEAN:
case MONO_TYPE_I1:
case MONO_TYPE_U1:
add_general (&gr, &stack_size, ainfo);
break;
case MONO_TYPE_I2:
case MONO_TYPE_U2:
case MONO_TYPE_CHAR:
add_general (&gr, &stack_size, ainfo);
break;
case MONO_TYPE_I4:
case MONO_TYPE_U4:
add_general (&gr, &stack_size, ainfo);
break;
case MONO_TYPE_I:
case MONO_TYPE_U:
case MONO_TYPE_PTR:
case MONO_TYPE_FNPTR:
case MONO_TYPE_CLASS:
case MONO_TYPE_OBJECT:
case MONO_TYPE_STRING:
case MONO_TYPE_SZARRAY:
case MONO_TYPE_ARRAY:
add_general (&gr, &stack_size, ainfo);
break;
case MONO_TYPE_GENERICINST:
if (!mono_type_generic_inst_is_valuetype (ptype)) {
add_general (&gr, &stack_size, ainfo);
break;
}
/* Fall through */
case MONO_TYPE_VALUETYPE:
add_valuetype (gsctx, sig, ainfo, sig->params [i], FALSE, &gr, &fr, &stack_size);
break;
case MONO_TYPE_TYPEDBYREF:
stack_size += sizeof (MonoTypedRef);
ainfo->storage = ArgOnStack;
break;
case MONO_TYPE_U8:
case MONO_TYPE_I8:
add_general_pair (&gr, &stack_size, ainfo);
break;
case MONO_TYPE_R4:
add_float (&fr, &stack_size, ainfo, FALSE);
break;
case MONO_TYPE_R8:
add_float (&fr, &stack_size, ainfo, TRUE);
break;
default:
g_error ("unexpected type 0x%x", ptype->type);
g_assert_not_reached ();
}
}
if (!sig->pinvoke && (sig->call_convention == MONO_CALL_VARARG) && (n > 0) && (sig->sentinelpos == sig->param_count)) {
gr = PARAM_REGS;
fr = FLOAT_PARAM_REGS;
/* Emit the signature cookie just before the implicit arguments */
add_general (&gr, &stack_size, &cinfo->sig_cookie);
}
if (mono_do_x86_stack_align && (stack_size % MONO_ARCH_FRAME_ALIGNMENT) != 0) {
cinfo->need_stack_align = TRUE;
cinfo->stack_align_amount = MONO_ARCH_FRAME_ALIGNMENT - (stack_size % MONO_ARCH_FRAME_ALIGNMENT);
stack_size += cinfo->stack_align_amount;
}
cinfo->stack_usage = stack_size;
cinfo->reg_usage = gr;
cinfo->freg_usage = fr;
return cinfo;
}
static CallInfo*
get_call_info (MonoGenericSharingContext *gsctx, MonoMemPool *mp, MonoMethodSignature *sig, gboolean is_pinvoke)
{
int n = sig->hasthis + sig->param_count;
CallInfo *cinfo;
if (mp)
cinfo = mono_mempool_alloc0 (mp, sizeof (CallInfo) + (sizeof (ArgInfo) * n));
else
cinfo = g_malloc0 (sizeof (CallInfo) + (sizeof (ArgInfo) * n));
return get_call_info_internal (gsctx, cinfo, sig, is_pinvoke);
}
/*
* mono_arch_get_argument_info:
* @csig: a method signature
* @param_count: the number of parameters to consider
* @arg_info: an array to store the result infos
*
* Gathers information on parameters such as size, alignment and
* padding. arg_info should be large enought to hold param_count + 1 entries.
*
* Returns the size of the argument area on the stack.
* This should be signal safe, since it is called from
* mono_arch_find_jit_info_ext ().
* FIXME: The metadata calls might not be signal safe.
*/
int
mono_arch_get_argument_info (MonoMethodSignature *csig, int param_count, MonoJitArgumentInfo *arg_info)
{
int k, args_size = 0;
int size, pad;
guint32 align;
int offset = 8;
CallInfo *cinfo;
/* Avoid g_malloc as it is not signal safe */
cinfo = (CallInfo*)g_newa (guint8*, sizeof (CallInfo) + (sizeof (ArgInfo) * (csig->param_count + 1)));
cinfo = get_call_info_internal (NULL, cinfo, csig, FALSE);
if (MONO_TYPE_ISSTRUCT (csig->ret) && (cinfo->ret.storage == ArgOnStack)) {
args_size += sizeof (gpointer);
offset += 4;
}
arg_info [0].offset = offset;
if (csig->hasthis) {
args_size += sizeof (gpointer);
offset += 4;
}
arg_info [0].size = args_size;
for (k = 0; k < param_count; k++) {
size = mini_type_stack_size_full (NULL, csig->params [k], &align, csig->pinvoke);
/* ignore alignment for now */
align = 1;
args_size += pad = (align - (args_size & (align - 1))) & (align - 1);
arg_info [k].pad = pad;
args_size += size;
arg_info [k + 1].pad = 0;
arg_info [k + 1].size = size;
offset += pad;
arg_info [k + 1].offset = offset;
offset += size;
}
if (mono_do_x86_stack_align && !CALLCONV_IS_STDCALL (csig))
align = MONO_ARCH_FRAME_ALIGNMENT;
else
align = 4;
args_size += pad = (align - (args_size & (align - 1))) & (align - 1);
arg_info [k].pad = pad;
return args_size;
}
static const guchar cpuid_impl [] = {
0x55, /* push %ebp */
0x89, 0xe5, /* mov %esp,%ebp */
0x53, /* push %ebx */
0x8b, 0x45, 0x08, /* mov 0x8(%ebp),%eax */
0x0f, 0xa2, /* cpuid */
0x50, /* push %eax */
0x8b, 0x45, 0x10, /* mov 0x10(%ebp),%eax */
0x89, 0x18, /* mov %ebx,(%eax) */
0x8b, 0x45, 0x14, /* mov 0x14(%ebp),%eax */
0x89, 0x08, /* mov %ecx,(%eax) */
0x8b, 0x45, 0x18, /* mov 0x18(%ebp),%eax */
0x89, 0x10, /* mov %edx,(%eax) */
0x58, /* pop %eax */
0x8b, 0x55, 0x0c, /* mov 0xc(%ebp),%edx */
0x89, 0x02, /* mov %eax,(%edx) */
0x5b, /* pop %ebx */
0xc9, /* leave */
0xc3, /* ret */
};
typedef void (*CpuidFunc) (int id, int* p_eax, int* p_ebx, int* p_ecx, int* p_edx);
static int
cpuid (int id, int* p_eax, int* p_ebx, int* p_ecx, int* p_edx)
{
int have_cpuid = 0;
#ifndef _MSC_VER
__asm__ __volatile__ (
"pushfl\n"
"popl %%eax\n"
"movl %%eax, %%edx\n"
"xorl $0x200000, %%eax\n"
"pushl %%eax\n"
"popfl\n"
"pushfl\n"
"popl %%eax\n"
"xorl %%edx, %%eax\n"
"andl $0x200000, %%eax\n"
"movl %%eax, %0"
: "=r" (have_cpuid)
:
: "%eax", "%edx"
);
#else
__asm {
pushfd
pop eax
mov edx, eax
xor eax, 0x200000
push eax
popfd
pushfd
pop eax
xor eax, edx
and eax, 0x200000
mov have_cpuid, eax
}
#endif
if (have_cpuid) {
/* Have to use the code manager to get around WinXP DEP */
static CpuidFunc func = NULL;
void *ptr;
if (!func) {
ptr = mono_global_codeman_reserve (sizeof (cpuid_impl));
memcpy (ptr, cpuid_impl, sizeof (cpuid_impl));
func = (CpuidFunc)ptr;
}
func (id, p_eax, p_ebx, p_ecx, p_edx);
/*
* We use this approach because of issues with gcc and pic code, see:
* http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7329
__asm__ __volatile__ ("cpuid"
: "=a" (*p_eax), "=b" (*p_ebx), "=c" (*p_ecx), "=d" (*p_edx)
: "a" (id));
*/
return 1;
}
return 0;
}
/*
* Initialize the cpu to execute managed code.
*/
void
mono_arch_cpu_init (void)
{
/* spec compliance requires running with double precision */
#ifndef _MSC_VER
guint16 fpcw;
__asm__ __volatile__ ("fnstcw %0\n": "=m" (fpcw));
fpcw &= ~X86_FPCW_PRECC_MASK;
fpcw |= X86_FPCW_PREC_DOUBLE;
__asm__ __volatile__ ("fldcw %0\n": : "m" (fpcw));
__asm__ __volatile__ ("fnstcw %0\n": "=m" (fpcw));
#else
_control87 (_PC_53, MCW_PC);
#endif
}
/*
* Initialize architecture specific code.
*/
void
mono_arch_init (void)
{
InitializeCriticalSection (&mini_arch_mutex);
ss_trigger_page = mono_valloc (NULL, mono_pagesize (), MONO_MMAP_READ);
bp_trigger_page = mono_valloc (NULL, mono_pagesize (), MONO_MMAP_READ|MONO_MMAP_32BIT);
mono_mprotect (bp_trigger_page, mono_pagesize (), 0);
}
/*
* Cleanup architecture specific code.
*/
void
mono_arch_cleanup (void)
{
DeleteCriticalSection (&mini_arch_mutex);
}
/*
* This function returns the optimizations supported on this cpu.
*/
guint32
mono_arch_cpu_optimizazions (guint32 *exclude_mask)
{
int eax, ebx, ecx, edx;
guint32 opts = 0;
*exclude_mask = 0;
/* Feature Flags function, flags returned in EDX. */
if (cpuid (1, &eax, &ebx, &ecx, &edx)) {
if (edx & (1 << 15)) {
opts |= MONO_OPT_CMOV;
if (edx & 1)
opts |= MONO_OPT_FCMOV;
else
*exclude_mask |= MONO_OPT_FCMOV;
} else
*exclude_mask |= MONO_OPT_CMOV;
if (edx & (1 << 26))
opts |= MONO_OPT_SSE2;
else
*exclude_mask |= MONO_OPT_SSE2;
#ifdef MONO_ARCH_SIMD_INTRINSICS
/*SIMD intrinsics require at least SSE2.*/
if (!(opts & MONO_OPT_SSE2))
*exclude_mask |= MONO_OPT_SIMD;
#endif
}
return opts;
}
/*
* This function test for all SSE functions supported.
*
* Returns a bitmask corresponding to all supported versions.
*
*/
guint32
mono_arch_cpu_enumerate_simd_versions (void)
{
int eax, ebx, ecx, edx;
guint32 sse_opts = 0;
if (cpuid (1, &eax, &ebx, &ecx, &edx)) {
if (edx & (1 << 25))
sse_opts |= 1 << SIMD_VERSION_SSE1;
if (edx & (1 << 26))
sse_opts |= 1 << SIMD_VERSION_SSE2;
if (ecx & (1 << 0))
sse_opts |= 1 << SIMD_VERSION_SSE3;
if (ecx & (1 << 9))
sse_opts |= 1 << SIMD_VERSION_SSSE3;
if (ecx & (1 << 19))
sse_opts |= 1 << SIMD_VERSION_SSE41;
if (ecx & (1 << 20))
sse_opts |= 1 << SIMD_VERSION_SSE42;
}
/* Yes, all this needs to be done to check for sse4a.
See: "Amd: CPUID Specification"
*/
if (cpuid (0x80000000, &eax, &ebx, &ecx, &edx)) {
/* eax greater or equal than 0x80000001, ebx = 'htuA', ecx = DMAc', edx = 'itne'*/
if ((((unsigned int) eax) >= 0x80000001) && (ebx == 0x68747541) && (ecx == 0x444D4163) && (edx == 0x69746E65)) {
cpuid (0x80000001, &eax, &ebx, &ecx, &edx);
if (ecx & (1 << 6))
sse_opts |= 1 << SIMD_VERSION_SSE4a;
}
}
return sse_opts;
}
/*
* Determine whenever the trap whose info is in SIGINFO is caused by
* integer overflow.
*/
gboolean
mono_arch_is_int_overflow (void *sigctx, void *info)
{
MonoContext ctx;
guint8* ip;
mono_arch_sigctx_to_monoctx (sigctx, &ctx);
ip = (guint8*)ctx.eip;
if ((ip [0] == 0xf7) && (x86_modrm_mod (ip [1]) == 0x3) && (x86_modrm_reg (ip [1]) == 0x7)) {
gint32 reg;
/* idiv REG */
switch (x86_modrm_rm (ip [1])) {
case X86_EAX:
reg = ctx.eax;
break;
case X86_ECX:
reg = ctx.ecx;
break;
case X86_EDX:
reg = ctx.edx;
break;
case X86_EBX:
reg = ctx.ebx;
break;
case X86_ESI:
reg = ctx.esi;
break;
case X86_EDI:
reg = ctx.edi;
break;
default:
g_assert_not_reached ();
reg = -1;
}
if (reg == -1)
return TRUE;
}
return FALSE;
}
GList *
mono_arch_get_allocatable_int_vars (MonoCompile *cfg)
{
GList *vars = NULL;
int i;
for (i = 0; i < cfg->num_varinfo; i++) {
MonoInst *ins = cfg->varinfo [i];
MonoMethodVar *vmv = MONO_VARINFO (cfg, i);
/* unused vars */
if (vmv->range.first_use.abs_pos >= vmv->range.last_use.abs_pos)
continue;
if ((ins->flags & (MONO_INST_IS_DEAD|MONO_INST_VOLATILE|MONO_INST_INDIRECT)) ||
(ins->opcode != OP_LOCAL && ins->opcode != OP_ARG))
continue;
/* we dont allocate I1 to registers because there is no simply way to sign extend
* 8bit quantities in caller saved registers on x86 */
if (mono_is_regsize_var (ins->inst_vtype) && (ins->inst_vtype->type != MONO_TYPE_I1)) {
g_assert (MONO_VARINFO (cfg, i)->reg == -1);
g_assert (i == vmv->idx);
vars = g_list_prepend (vars, vmv);
}
}
vars = mono_varlist_sort (cfg, vars, 0);
return vars;
}
GList *
mono_arch_get_global_int_regs (MonoCompile *cfg)
{
GList *regs = NULL;
/* we can use 3 registers for global allocation */
regs = g_list_prepend (regs, (gpointer)X86_EBX);
regs = g_list_prepend (regs, (gpointer)X86_ESI);
regs = g_list_prepend (regs, (gpointer)X86_EDI);
return regs;
}
/*
* mono_arch_regalloc_cost:
*
* Return the cost, in number of memory references, of the action of
* allocating the variable VMV into a register during global register
* allocation.
*/
guint32
mono_arch_regalloc_cost (MonoCompile *cfg, MonoMethodVar *vmv)
{
MonoInst *ins = cfg->varinfo [vmv->idx];
if (cfg->method->save_lmf)
/* The register is already saved */
return (ins->opcode == OP_ARG) ? 1 : 0;
else
/* push+pop+possible load if it is an argument */
return (ins->opcode == OP_ARG) ? 3 : 2;
}
static void
set_needs_stack_frame (MonoCompile *cfg, gboolean flag)
{
static int inited = FALSE;
static int count = 0;
if (cfg->arch.need_stack_frame_inited) {
g_assert (cfg->arch.need_stack_frame == flag);
return;
}
cfg->arch.need_stack_frame = flag;
cfg->arch.need_stack_frame_inited = TRUE;
if (flag)
return;
if (!inited) {
mono_counters_register ("Could eliminate stack frame", MONO_COUNTER_INT|MONO_COUNTER_JIT, &count);
inited = TRUE;
}
++count;
//g_print ("will eliminate %s.%s.%s\n", cfg->method->klass->name_space, cfg->method->klass->name, cfg->method->name);
}
static gboolean
needs_stack_frame (MonoCompile *cfg)
{
MonoMethodSignature *sig;
MonoMethodHeader *header;
gboolean result = FALSE;
#if defined(__APPLE__)
/*OSX requires stack frame code to have the correct alignment. */
return TRUE;
#endif
if (cfg->arch.need_stack_frame_inited)
return cfg->arch.need_stack_frame;
header = mono_method_get_header (cfg->method);
sig = mono_method_signature (cfg->method);
if (cfg->disable_omit_fp)
result = TRUE;
else if (cfg->flags & MONO_CFG_HAS_ALLOCA)
result = TRUE;
else if (cfg->method->save_lmf)
result = TRUE;
else if (cfg->stack_offset)
result = TRUE;
else if (cfg->param_area)
result = TRUE;
else if (cfg->flags & (MONO_CFG_HAS_CALLS | MONO_CFG_HAS_ALLOCA | MONO_CFG_HAS_TAIL))
result = TRUE;
else if (header->num_clauses)
result = TRUE;
else if (sig->param_count + sig->hasthis)
result = TRUE;
else if (!sig->pinvoke && (sig->call_convention == MONO_CALL_VARARG))
result = TRUE;
else if ((mono_jit_trace_calls != NULL && mono_trace_eval (cfg->method)) ||
(cfg->prof_options & MONO_PROFILE_ENTER_LEAVE))
result = TRUE;
set_needs_stack_frame (cfg, result);
return cfg->arch.need_stack_frame;
}
/*
* Set var information according to the calling convention. X86 version.
* The locals var stuff should most likely be split in another method.
*/
void
mono_arch_allocate_vars (MonoCompile *cfg)
{
MonoMethodSignature *sig;
MonoMethodHeader *header;
MonoInst *inst;
guint32 locals_stack_size, locals_stack_align;
int i, offset;
gint32 *offsets;
CallInfo *cinfo;
header = mono_method_get_header (cfg->method);
sig = mono_method_signature (cfg->method);
cinfo = get_call_info (cfg->generic_sharing_context, cfg->mempool, sig, FALSE);
cfg->frame_reg = X86_EBP;
offset = 0;
/* Reserve space to save LMF and caller saved registers */
if (cfg->method->save_lmf) {
offset += sizeof (MonoLMF);
} else {
if (cfg->used_int_regs & (1 << X86_EBX)) {
offset += 4;
}
if (cfg->used_int_regs & (1 << X86_EDI)) {
offset += 4;
}
if (cfg->used_int_regs & (1 << X86_ESI)) {
offset += 4;
}
}
switch (cinfo->ret.storage) {
case ArgValuetypeInReg:
/* Allocate a local to hold the result, the epilog will copy it to the correct place */
offset += 8;
cfg->ret->opcode = OP_REGOFFSET;
cfg->ret->inst_basereg = X86_EBP;
cfg->ret->inst_offset = - offset;
break;
default:
break;