Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
- $Id: emit.c 4398 2006-01-31 23:43:08Z twisti $
-
*/
#include "vm/types.h"
#include <assert.h>
+#include <stdint.h>
#include "md-abi.h"
#include "mm/memory.h"
-#if defined(ENABLE_THREADS)
-# include "threads/native/lock.h"
-#endif
+#include "threads/lock-common.h"
#include "vm/builtin.h"
+#include "vm/exceptions.h"
+#include "vm/jit/abi.h"
#include "vm/jit/abi-asm.h"
#include "vm/jit/asmpart.h"
#include "vm/jit/dseg.h"
#include "vm/jit/emit-common.h"
#include "vm/jit/jit.h"
+#include "vm/jit/patcher-common.h"
#include "vm/jit/replace.h"
#include "vmcore/options.h"
if (IS_INMEMORY(src->flags)) {
COUNT_SPILLS;
- disp = src->vv.regoff * 8;
+ disp = src->vv.regoff;
switch (src->type) {
case TYPE_INT:
if (IS_INMEMORY(dst->flags)) {
COUNT_SPILLS;
- disp = dst->vv.regoff * 8;
+ disp = dst->vv.regoff;
switch (dst->type) {
case TYPE_INT:
*******************************************************************************/
-void emit_copy(jitdata *jd, instruction *iptr, varinfo *src, varinfo *dst)
+void emit_copy(jitdata *jd, instruction *iptr)
{
- codegendata *cd;
- s4 s1, d;
+ codegendata *cd;
+ varinfo *src;
+ varinfo *dst;
+ s4 s1, d;
/* get required compiler data */
cd = jd->cd;
+ /* get source and destination variables */
+
+ src = VAROP(iptr->s1);
+ dst = VAROP(iptr->dst);
+
if ((src->vv.regoff != dst->vv.regoff) ||
((src->flags ^ dst->flags) & INMEMORY)) {
+ if ((src->type == TYPE_RET) || (dst->type == TYPE_RET)) {
+ /* emit nothing, as the value won't be used anyway */
+ return;
+ }
+
/* If one of the variables resides in memory, we can eliminate
the register move from/to the temporary register with the
order of getting the destination register and the load. */
if (IS_INMEMORY(src->flags)) {
- d = codegen_reg_of_var(iptr->opc, dst, REG_IFTMP);
+ d = codegen_reg_of_var(iptr->opc, dst, REG_IFTMP);
s1 = emit_load(jd, iptr, src, d);
}
else {
s1 = emit_load(jd, iptr, src, REG_IFTMP);
- d = codegen_reg_of_var(iptr->opc, dst, s1);
+ d = codegen_reg_of_var(iptr->opc, dst, s1);
}
if (s1 != d) {
- switch (dst->type) {
+ switch (src->type) {
case TYPE_INT:
case TYPE_LNG:
case TYPE_ADR:
M_FMOV(s1, d);
break;
default:
- vm_abort("emit_copy: unknown type %d", dst->type);
+ vm_abort("emit_copy: unknown type %d", src->type);
}
}
}
-/* emit_arrayindexoutofbounds_check ********************************************
+/* emit_branch *****************************************************************
- Emit an ArrayIndexOutOfBoundsException check.
+ Emits the code for conditional and unconditional branchs.
*******************************************************************************/
-void emit_arrayindexoutofbounds_check(codegendata *cd, instruction *iptr, s4 s1, s4 s2)
+void emit_branch(codegendata *cd, s4 disp, s4 condition, s4 reg, u4 opt)
{
- if (INSTRUCTION_MUST_CHECK(iptr)) {
- M_ILD(REG_ITMP3, s1, OFFSET(java_arrayheader, size));
- M_CMPULT(s2, REG_ITMP3, REG_ITMP3);
- M_BEQZ(REG_ITMP3, 0);
- codegen_add_arrayindexoutofboundsexception_ref(cd, s2);
- }
-}
+ s4 checkdisp;
+ s4 branchdisp;
+ /* calculate the different displacements */
-/* emit_arraystore_check *******************************************************
+ checkdisp = (disp - 4);
+ branchdisp = (disp - 4) >> 2;
- Emit an ArrayStoreException check.
+ /* check which branch to generate */
-*******************************************************************************/
+ if (condition == BRANCH_UNCONDITIONAL) {
+ /* check displacement for overflow */
-void emit_arraystore_check(codegendata *cd, instruction *iptr, s4 reg)
-{
- M_BEQZ(reg, 0);
- codegen_add_arraystoreexception_ref(cd);
-}
+ if ((checkdisp < (s4) 0xffe00000) || (checkdisp > (s4) 0x001fffff)) {
+ /* if the long-branches flag isn't set yet, do it */
+ if (!CODEGENDATA_HAS_FLAG_LONGBRANCHES(cd)) {
+ log_println("setting error");
+ cd->flags |= (CODEGENDATA_FLAG_ERROR |
+ CODEGENDATA_FLAG_LONGBRANCHES);
+ }
-/* emit_classcast_check ********************************************************
+ vm_abort("emit_branch: emit unconditional long-branch code");
+ }
+ else {
+ M_BR(branchdisp);
+ }
+ }
+ else {
+ /* and displacement for overflow */
- Emit a ClassCastException check.
+ if ((checkdisp < (s4) 0xffe00000) || (checkdisp > (s4) 0x001fffff)) {
+ /* if the long-branches flag isn't set yet, do it */
-*******************************************************************************/
+ if (!CODEGENDATA_HAS_FLAG_LONGBRANCHES(cd)) {
+ log_println("setting error");
+ cd->flags |= (CODEGENDATA_FLAG_ERROR |
+ CODEGENDATA_FLAG_LONGBRANCHES);
+ }
-void emit_classcast_check(codegendata *cd, instruction *iptr, s4 condition, s4 reg, s4 s1)
-{
- if (INSTRUCTION_MUST_CHECK(iptr)) {
- M_BNEZ(reg, 0);
- codegen_add_classcastexception_ref(cd, s1);
+ vm_abort("emit_branch: emit conditional long-branch code");
+ }
+ else {
+ switch (condition) {
+ case BRANCH_EQ:
+ M_BEQZ(reg, branchdisp);
+ break;
+ case BRANCH_NE:
+ M_BNEZ(reg, branchdisp);
+ break;
+ case BRANCH_LT:
+ M_BLTZ(reg, branchdisp);
+ break;
+ case BRANCH_GE:
+ M_BGEZ(reg, branchdisp);
+ break;
+ case BRANCH_GT:
+ M_BGTZ(reg, branchdisp);
+ break;
+ case BRANCH_LE:
+ M_BLEZ(reg, branchdisp);
+ break;
+ default:
+ vm_abort("emit_branch: unknown condition %d", condition);
+ }
+ }
}
}
-/* emit_nullpointer_check ******************************************************
+/* emit_arithmetic_check *******************************************************
- Emit a NullPointerException check.
+ Emit an ArithmeticException check.
*******************************************************************************/
-void emit_nullpointer_check(codegendata *cd, instruction *iptr, s4 reg)
+void emit_arithmetic_check(codegendata *cd, instruction *iptr, s4 reg)
{
if (INSTRUCTION_MUST_CHECK(iptr)) {
- M_BEQZ(reg, 0);
- codegen_add_nullpointerexception_ref(cd);
+ M_BNEZ(reg, 1);
+ /* Destination register must not be REG_ZERO, because then no
+ SIGSEGV is thrown. */
+ M_ALD_INTERN(reg, REG_ZERO, EXCEPTION_HARDWARE_ARITHMETIC);
}
}
-/* emit_exception_stubs ********************************************************
+/* emit_arrayindexoutofbounds_check ********************************************
- Generates the code for the exception stubs.
+ Emit an ArrayIndexOutOfBoundsException check.
*******************************************************************************/
-void emit_exception_stubs(jitdata *jd)
+void emit_arrayindexoutofbounds_check(codegendata *cd, instruction *iptr, s4 s1, s4 s2)
{
- codegendata *cd;
- registerdata *rd;
- exceptionref *er;
- s4 branchmpc;
- s4 targetmpc;
- s4 targetdisp;
- s4 disp;
-
- /* get required compiler data */
-
- cd = jd->cd;
- rd = jd->rd;
-
- /* generate exception stubs */
-
- targetdisp = 0;
-
- for (er = cd->exceptionrefs; er != NULL; er = er->next) {
- /* back-patch the branch to this exception code */
-
- branchmpc = er->branchpos;
- targetmpc = cd->mcodeptr - cd->mcodebase;
-
- md_codegen_patch_branch(cd, branchmpc, targetmpc);
-
- MCODECHECK(100);
-
- /* move index register into REG_ITMP1 */
-
- /* Check if the exception is an
- ArrayIndexOutOfBoundsException. If so, move index register
- into a4. */
-
- if (er->reg != -1)
- M_MOV(er->reg, rd->argintregs[4]);
-
- /* calcuate exception address */
-
- M_LDA(rd->argintregs[3], REG_PV, er->branchpos - 4);
-
- /* move function to call into REG_ITMP3 */
-
- disp = dseg_add_functionptr(cd, er->function);
- M_ALD(REG_ITMP3, REG_PV, disp);
-
- if (targetdisp == 0) {
- targetdisp = ((u4 *) cd->mcodeptr) - ((u4 *) cd->mcodebase);
-
- M_MOV(REG_PV, rd->argintregs[0]);
- M_MOV(REG_SP, rd->argintregs[1]);
-
- if (jd->isleafmethod)
- M_MOV(REG_RA, rd->argintregs[2]);
- else
- M_ALD(rd->argintregs[2],
- REG_SP, cd->stackframesize * 8 - SIZEOF_VOID_P);
-
- M_LDA(REG_SP, REG_SP, -2 * 8);
- M_AST(rd->argintregs[3], REG_SP, 0 * 8); /* store XPC */
-
- if (jd->isleafmethod)
- M_AST(REG_RA, REG_SP, 1 * 8);
-
- M_MOV(REG_ITMP3, REG_PV);
- M_JSR(REG_RA, REG_PV);
- disp = (s4) (cd->mcodeptr - cd->mcodebase);
- M_LDA(REG_PV, REG_RA, -disp);
-
- M_MOV(REG_RESULT, REG_ITMP1_XPTR);
-
- if (jd->isleafmethod)
- M_ALD(REG_RA, REG_SP, 1 * 8);
-
- M_ALD(REG_ITMP2_XPC, REG_SP, 0 * 8);
- M_LDA(REG_SP, REG_SP, 2 * 8);
-
- disp = dseg_add_functionptr(cd, asm_handle_exception);
- M_ALD(REG_ITMP3, REG_PV, disp);
- M_JMP(REG_ZERO, REG_ITMP3);
- }
- else {
- disp = (((u4 *) cd->mcodebase) + targetdisp) -
- (((u4 *) cd->mcodeptr) + 1);
-
- M_BR(disp);
- }
+ if (INSTRUCTION_MUST_CHECK(iptr)) {
+ M_ILD(REG_ITMP3, s1, OFFSET(java_array_t, size));
+ M_CMPULT(s2, REG_ITMP3, REG_ITMP3);
+ M_BNEZ(REG_ITMP3, 1);
+ M_ALD_INTERN(s2, REG_ZERO, EXCEPTION_HARDWARE_ARRAYINDEXOUTOFBOUNDS);
}
}
-/* emit_patcher_stubs **********************************************************
+/* emit_classcast_check ********************************************************
- Generates the code for the patcher stubs.
+ Emit a ClassCastException check.
*******************************************************************************/
-void emit_patcher_stubs(jitdata *jd)
+void emit_classcast_check(codegendata *cd, instruction *iptr, s4 condition, s4 reg, s4 s1)
{
- codegendata *cd;
- patchref *pref;
- u4 mcode;
- u1 *savedmcodeptr;
- u1 *tmpmcodeptr;
- s4 targetdisp;
- s4 disp;
-
- /* get required compiler data */
-
- cd = jd->cd;
-
- /* generate code patching stub call code */
-
- targetdisp = 0;
-
- for (pref = cd->patchrefs; pref != NULL; pref = pref->next) {
- /* check code segment size */
-
- MCODECHECK(100);
-
- /* Get machine code which is patched back in later. The
- call is 1 instruction word long. */
-
- tmpmcodeptr = (u1 *) (cd->mcodebase + pref->branchpos);
-
- mcode = *((u4 *) tmpmcodeptr);
-
- /* Patch in the call to call the following code (done at
- compile time). */
-
- savedmcodeptr = cd->mcodeptr; /* save current mcodeptr */
- cd->mcodeptr = tmpmcodeptr; /* set mcodeptr to patch position */
-
- disp = ((u4 *) savedmcodeptr) - (((u4 *) tmpmcodeptr) + 1);
- M_BSR(REG_ITMP3, disp);
-
- cd->mcodeptr = savedmcodeptr; /* restore the current mcodeptr */
-
- /* create stack frame */
-
- M_LSUB_IMM(REG_SP, 6 * 8, REG_SP);
-
- /* move return address onto stack */
-
- M_AST(REG_ITMP3, REG_SP, 5 * 8);
-
- /* move pointer to java_objectheader onto stack */
-
-#if defined(ENABLE_THREADS)
- /* create a virtual java_objectheader */
-
- (void) dseg_add_unique_address(cd, NULL); /* flcword */
- (void) dseg_add_unique_address(cd, lock_get_initial_lock_word());
- disp = dseg_add_unique_address(cd, NULL); /* vftbl */
-
- M_LDA(REG_ITMP3, REG_PV, disp);
- M_AST(REG_ITMP3, REG_SP, 4 * 8);
-#else
- /* nothing to do */
-#endif
-
- /* move machine code onto stack */
-
- disp = dseg_add_s4(cd, mcode);
- M_ILD(REG_ITMP3, REG_PV, disp);
- M_IST(REG_ITMP3, REG_SP, 3 * 8);
-
- /* move class/method/field reference onto stack */
-
- disp = dseg_add_address(cd, pref->ref);
- M_ALD(REG_ITMP3, REG_PV, disp);
- M_AST(REG_ITMP3, REG_SP, 2 * 8);
-
- /* move data segment displacement onto stack */
-
- disp = dseg_add_s4(cd, pref->disp);
- M_ILD(REG_ITMP3, REG_PV, disp);
- M_IST(REG_ITMP3, REG_SP, 1 * 8);
-
- /* move patcher function pointer onto stack */
-
- disp = dseg_add_functionptr(cd, pref->patcher);
- M_ALD(REG_ITMP3, REG_PV, disp);
- M_AST(REG_ITMP3, REG_SP, 0 * 8);
-
- if (targetdisp == 0) {
- targetdisp = ((u4 *) cd->mcodeptr) - ((u4 *) cd->mcodebase);
-
- disp = dseg_add_functionptr(cd, asm_patcher_wrapper);
- M_ALD(REG_ITMP3, REG_PV, disp);
- M_JMP(REG_ZERO, REG_ITMP3);
- }
- else {
- disp = (((u4 *) cd->mcodebase) + targetdisp) -
- (((u4 *) cd->mcodeptr) + 1);
-
- M_BR(disp);
+ if (INSTRUCTION_MUST_CHECK(iptr)) {
+ switch (condition) {
+ case BRANCH_EQ:
+ M_BNEZ(reg, 1);
+ break;
+ case BRANCH_LE:
+ M_BGTZ(reg, 1);
+ break;
+ default:
+ vm_abort("emit_classcast_check: unknown condition %d", condition);
}
+ M_ALD_INTERN(s1, REG_ZERO, EXCEPTION_HARDWARE_CLASSCAST);
}
}
-/* emit_replacement_stubs ******************************************************
+/* emit_nullpointer_check ******************************************************
- Generates the code for the replacement stubs.
+ Emit a NullPointerException check.
*******************************************************************************/
-#if defined(ENABLE_REPLACEMENT)
-void emit_replacement_stubs(jitdata *jd)
+void emit_nullpointer_check(codegendata *cd, instruction *iptr, s4 reg)
{
- codegendata *cd;
- codeinfo *code;
- rplpoint *rplp;
- s4 disp;
- s4 i;
-#if !defined(NDEBUG)
- u1 *savedmcodeptr;
-#endif
-
- /* get required compiler data */
-
- cd = jd->cd;
- code = jd->code;
-
- rplp = code->rplpoints;
+ if (INSTRUCTION_MUST_CHECK(iptr)) {
+ M_BNEZ(reg, 1);
+ /* Destination register must not be REG_ZERO, because then no
+ SIGSEGV is thrown. */
+ M_ALD_INTERN(reg, REG_ZERO, EXCEPTION_HARDWARE_NULLPOINTER);
+ }
+}
- /* store beginning of replacement stubs */
- code->replacementstubs = (u1*) (cd->mcodeptr - cd->mcodebase);
+/* emit_exception_check ********************************************************
- for (i = 0; i < code->rplpointcount; ++i, ++rplp) {
- /* do not generate stubs for non-trappable points */
+ Emit an Exception check.
- if (rplp->flags & RPLPOINT_FLAG_NOTRAP)
- continue;
+*******************************************************************************/
- /* check code segment size */
+void emit_exception_check(codegendata *cd, instruction *iptr)
+{
+ if (INSTRUCTION_MUST_CHECK(iptr)) {
+ M_BNEZ(REG_RESULT, 1);
+ /* Destination register must not be REG_ZERO, because then no
+ SIGSEGV is thrown. */
+ M_ALD_INTERN(REG_RESULT, REG_ZERO, EXCEPTION_HARDWARE_EXCEPTION);
+ }
+}
- MCODECHECK(100);
-#if !defined(NDEBUG)
- savedmcodeptr = cd->mcodeptr;
-#endif
+/* emit_trap *******************************************************************
- /* create stack frame - 16-byte aligned */
+ Emit a trap instruction and return the original machine code.
- M_LSUB_IMM(REG_SP, 2 * 8, REG_SP);
+*******************************************************************************/
- /* push address of `rplpoint` struct */
+uint32_t emit_trap(codegendata *cd)
+{
+ uint32_t mcode;
- disp = dseg_add_address(cd, rplp);
- M_ALD(REG_ITMP3, REG_PV, disp);
- M_AST(REG_ITMP3, REG_SP, 0 * 8);
+ /* Get machine code which is patched back in later. The
+ trap is 1 instruction word long. */
- /* jump to replacement function */
+ mcode = *((u4 *) cd->mcodeptr);
- disp = dseg_add_functionptr(cd, asm_replacement_out);
- M_ALD(REG_ITMP3, REG_PV, disp);
- M_JMP(REG_ZERO, REG_ITMP3);
+ /* Destination register must not be REG_ZERO, because then no
+ SIGSEGV is thrown. */
+ M_ALD_INTERN(REG_RESULT, REG_ZERO, EXCEPTION_HARDWARE_PATCHER);
- assert((cd->mcodeptr - savedmcodeptr) == 4*REPLACEMENT_STUB_SIZE);
- }
+ return mcode;
}
-#endif /* defined(ENABLE_REPLACEMENT) */
/* emit_verbosecall_enter ******************************************************
/* save argument registers */
for (i = 0; i < INT_ARG_CNT; i++)
- M_LST(rd->argintregs[i], REG_SP, (2 + i) * 8);
+ M_LST(abi_registers_integer_argument[i], REG_SP, (2 + i) * 8);
for (i = 0; i < FLT_ARG_CNT; i++)
- M_DST(rd->argintregs[i], REG_SP, (2 + INT_ARG_CNT + i) * 8);
+ M_DST(abi_registers_float_argument[i], REG_SP, (2 + INT_ARG_CNT + i) * 8);
/* save temporary registers for leaf methods */
if (IS_FLT_DBL_TYPE(t)) {
if (IS_2_WORD_TYPE(t)) {
- M_DST(rd->argfltregs[i], REG_SP, 0 * 8);
- M_LLD(rd->argintregs[i], REG_SP, 0 * 8);
+ M_DST(abi_registers_float_argument[i], REG_SP, 0 * 8);
+ M_LLD(abi_registers_integer_argument[i], REG_SP, 0 * 8);
}
else {
- M_FST(rd->argfltregs[i], REG_SP, 0 * 8);
- M_ILD(rd->argintregs[i], REG_SP, 0 * 8);
+ M_FST(abi_registers_float_argument[i], REG_SP, 0 * 8);
+ M_ILD(abi_registers_integer_argument[i], REG_SP, 0 * 8);
}
}
}
/* restore argument registers */
for (i = 0; i < INT_ARG_CNT; i++)
- M_LLD(rd->argintregs[i], REG_SP, (2 + i) * 8);
+ M_LLD(abi_registers_integer_argument[i], REG_SP, (2 + i) * 8);
for (i = 0; i < FLT_ARG_CNT; i++)
- M_DLD(rd->argintregs[i], REG_SP, (2 + INT_ARG_CNT + i) * 8);
+ M_DLD(abi_registers_float_argument[i], REG_SP, (2 + INT_ARG_CNT + i) * 8);
/* restore temporary registers for leaf methods */
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