/* src/vm/jit/codegen-common.c - architecture independent code generator stuff Copyright (C) 1996-2005, 2006, 2007 R. Grafl, A. Krall, C. Kruegel, C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring, E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich, J. Wenninger, Institut f. Computersprachen - TU Wien This file is part of CACAO. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. All functions assume the following code area / data area layout: +-----------+ | | | code area | code area grows to higher addresses | | +-----------+ <-- start of procedure | | | data area | data area grows to lower addresses | | +-----------+ The functions first write into a temporary code/data area allocated by "codegen_init". "codegen_finish" copies the code and data area into permanent memory. All functions writing values into the data area return the offset relative the begin of the code area (start of procedure). $Id: codegen-common.c 7652 2007-04-03 14:23:16Z twisti $ */ #include "config.h" #include #include #include "vm/types.h" #if defined(ENABLE_JIT) /* this is required PATCHER_CALL_SIZE */ # include "codegen.h" #endif #if defined(__ARM__) /* this is required for REG_SPLIT */ # include "md-abi.h" #endif #include "mm/memory.h" #include "toolbox/avl.h" #include "toolbox/list.h" #include "toolbox/logging.h" #include "native/jni.h" #include "native/native.h" #if defined(ENABLE_THREADS) # include "threads/native/threads.h" #endif #include "vm/exceptions.h" #include "vm/stringlocal.h" #include "vm/jit/abi.h" #include "vm/jit/asmpart.h" #include "vm/jit/codegen-common.h" #if defined(ENABLE_DISASSEMBLER) # include "vm/jit/disass.h" #endif #include "vm/jit/dseg.h" #include "vm/jit/emit-common.h" #include "vm/jit/jit.h" #include "vm/jit/md.h" #include "vm/jit/replace.h" #include "vm/jit/stacktrace.h" #if defined(ENABLE_INTRP) #include "vm/jit/intrp/intrp.h" #endif #include "vmcore/method.h" #include "vmcore/options.h" # include "vmcore/statistics.h" /* in this tree we store all method addresses *********************************/ static avl_tree *methodtree = NULL; static s4 methodtree_comparator(const void *pc, const void *element); /* codegen_init **************************************************************** TODO *******************************************************************************/ void codegen_init(void) { /* this tree is global, not method specific */ if (!methodtree) { #if defined(ENABLE_JIT) methodtree_element *mte; #endif methodtree = avl_create(&methodtree_comparator); #if defined(ENABLE_JIT) /* insert asm_vm_call_method */ mte = NEW(methodtree_element); mte->startpc = (u1 *) (ptrint) asm_vm_call_method; mte->endpc = (u1 *) (ptrint) asm_vm_call_method_end; avl_insert(methodtree, mte); #endif /* defined(ENABLE_JIT) */ } } /* codegen_setup *************************************************************** Allocates and initialises code area, data area and references. *******************************************************************************/ void codegen_setup(jitdata *jd) { methodinfo *m; codegendata *cd; /* get required compiler data */ m = jd->m; cd = jd->cd; /* initialize members */ cd->flags = 0; cd->mcodebase = DMNEW(u1, MCODEINITSIZE); cd->mcodeend = cd->mcodebase + MCODEINITSIZE; cd->mcodesize = MCODEINITSIZE; /* initialize mcode variables */ cd->mcodeptr = cd->mcodebase; cd->lastmcodeptr = cd->mcodebase; #if defined(ENABLE_INTRP) /* native dynamic superinstructions variables */ if (opt_intrp) { cd->ncodebase = DMNEW(u1, NCODEINITSIZE); cd->ncodesize = NCODEINITSIZE; /* initialize ncode variables */ cd->ncodeptr = cd->ncodebase; cd->lastinstwithoutdispatch = ~0; /* no inst without dispatch */ cd->superstarts = NULL; } #endif cd->dseg = NULL; cd->dseglen = 0; cd->jumpreferences = NULL; #if defined(__I386__) || defined(__X86_64__) || defined(__XDSPCORE__) || defined(__M68K__) || defined(ENABLE_INTRP) cd->datareferences = NULL; #endif /* cd->patchrefs = list_create_dump(OFFSET(patchref, linkage)); */ cd->patchrefs = NULL; cd->brancheslabel = list_create_dump(OFFSET(branch_label_ref_t, linkage)); cd->linenumberreferences = NULL; cd->linenumbertablesizepos = 0; cd->linenumbertablestartpos = 0; cd->linenumbertab = 0; cd->maxstack = m->maxstack; #if defined(ENABLE_THREADS) cd->threadcritcurrent.next = NULL; cd->threadcritcount = 0; #endif } /* codegen_reset *************************************************************** Resets the codegen data structure so we can recompile the method. *******************************************************************************/ static void codegen_reset(jitdata *jd) { codeinfo *code; codegendata *cd; basicblock *bptr; /* get required compiler data */ code = jd->code; cd = jd->cd; /* reset error flag */ cd->flags &= ~CODEGENDATA_FLAG_ERROR; /* reset some members, we reuse the code memory already allocated as this should have almost the correct size */ cd->mcodeptr = cd->mcodebase; cd->lastmcodeptr = cd->mcodebase; cd->dseg = NULL; cd->dseglen = 0; cd->jumpreferences = NULL; #if defined(__I386__) || defined(__X86_64__) || defined(__XDSPCORE__) || defined(__M68K__) || defined(ENABLE_INTRP) cd->datareferences = NULL; #endif /* cd->patchrefs = list_create_dump(OFFSET(patchref, linkage)); */ cd->patchrefs = NULL; cd->brancheslabel = list_create_dump(OFFSET(branch_label_ref_t, linkage)); cd->linenumberreferences = NULL; cd->linenumbertablesizepos = 0; cd->linenumbertablestartpos = 0; cd->linenumbertab = 0; #if defined(ENABLE_THREADS) cd->threadcritcurrent.next = NULL; cd->threadcritcount = 0; #endif /* We need to clear the mpc and the branch references from all basic blocks as they will definitely change. */ for (bptr = jd->basicblocks; bptr != NULL; bptr = bptr->next) { bptr->mpc = -1; bptr->branchrefs = NULL; } #if defined(ENABLE_REPLACEMENT) code->rplpoints = NULL; code->rplpointcount = 0; code->regalloc = NULL; code->regalloccount = 0; code->globalcount = 0; #endif } /* codegen_generate ************************************************************ Generates the code for the currently compiled method. *******************************************************************************/ bool codegen_generate(jitdata *jd) { codegendata *cd; /* get required compiler data */ cd = jd->cd; /* call the machine-dependent code generation function */ if (!codegen_emit(jd)) return false; /* check for an error */ if (CODEGENDATA_HAS_FLAG_ERROR(cd)) { /* check for long-branches flag, if it is set we recompile the method */ /* XXX maybe we should tag long-branches-methods for recompilation */ if (CODEGENDATA_HAS_FLAG_LONGBRANCHES(cd)) { /* we have to reset the codegendata structure first */ codegen_reset(jd); /* and restart the compiler run */ if (!codegen_emit(jd)) return false; } else { vm_abort("codegen_generate: unknown error occurred during codegen_emit: flags=%x\n", cd->flags); } } /* reallocate the memory and finish the code generation */ codegen_finish(jd); /* everything's ok */ return true; } /* codegen_close *************************************************************** TODO *******************************************************************************/ void codegen_close(void) { /* TODO: release avl tree on i386 and x86_64 */ } /* codegen_increase ************************************************************ Doubles code area. *******************************************************************************/ void codegen_increase(codegendata *cd) { u1 *oldmcodebase; /* save old mcodebase pointer */ oldmcodebase = cd->mcodebase; /* reallocate to new, doubled memory */ cd->mcodebase = DMREALLOC(cd->mcodebase, u1, cd->mcodesize, cd->mcodesize * 2); cd->mcodesize *= 2; cd->mcodeend = cd->mcodebase + cd->mcodesize; /* set new mcodeptr */ cd->mcodeptr = cd->mcodebase + (cd->mcodeptr - oldmcodebase); #if defined(__I386__) || defined(__MIPS__) || defined(__X86_64__) || defined(ENABLE_INTRP) /* adjust the pointer to the last patcher position */ if (cd->lastmcodeptr != NULL) cd->lastmcodeptr = cd->mcodebase + (cd->lastmcodeptr - oldmcodebase); #endif } /* codegen_ncode_increase ****************************************************** Doubles code area. *******************************************************************************/ #if defined(ENABLE_INTRP) u1 *codegen_ncode_increase(codegendata *cd, u1 *ncodeptr) { u1 *oldncodebase; /* save old ncodebase pointer */ oldncodebase = cd->ncodebase; /* reallocate to new, doubled memory */ cd->ncodebase = DMREALLOC(cd->ncodebase, u1, cd->ncodesize, cd->ncodesize * 2); cd->ncodesize *= 2; /* return the new ncodeptr */ return (cd->ncodebase + (ncodeptr - oldncodebase)); } #endif /* codegen_add_branch_ref ****************************************************** Prepends an branch to the list. *******************************************************************************/ void codegen_add_branch_ref(codegendata *cd, basicblock *target, s4 condition, s4 reg, u4 options) { branchref *br; s4 branchmpc; STATISTICS(count_branches_unresolved++); /* calculate the mpc of the branch instruction */ branchmpc = cd->mcodeptr - cd->mcodebase; br = DNEW(branchref); br->branchmpc = branchmpc; br->condition = condition; br->reg = reg; br->options = options; br->next = target->branchrefs; target->branchrefs = br; } /* codegen_resolve_branchrefs ************************************************** Resolves and patches the branch references of a given basic block. *******************************************************************************/ void codegen_resolve_branchrefs(codegendata *cd, basicblock *bptr) { branchref *br; u1 *mcodeptr; /* Save the mcodeptr because in the branch emitting functions we generate code somewhere inside already generated code, but we're still in the actual code generation phase. */ mcodeptr = cd->mcodeptr; /* just to make sure */ assert(bptr->mpc >= 0); for (br = bptr->branchrefs; br != NULL; br = br->next) { /* temporary set the mcodeptr */ cd->mcodeptr = cd->mcodebase + br->branchmpc; /* emit_bccz and emit_branch emit the correct code, even if we pass condition == BRANCH_UNCONDITIONAL or reg == -1. */ emit_bccz(cd, bptr, br->condition, br->reg, br->options); } /* restore mcodeptr */ cd->mcodeptr = mcodeptr; } /* codegen_branch_label_add **************************************************** Append an branch to the label-branch list. *******************************************************************************/ void codegen_branch_label_add(codegendata *cd, s4 label, s4 condition, s4 reg, u4 options) { list *list; branch_label_ref_t *br; s4 mpc; /* get the label list */ list = cd->brancheslabel; /* calculate the current mpc */ mpc = cd->mcodeptr - cd->mcodebase; br = DNEW(branch_label_ref_t); br->mpc = mpc; br->label = label; br->condition = condition; br->reg = reg; br->options = options; /* add the branch to the list */ list_add_last_unsynced(list, br); } /* codegen_add_patch_ref ******************************************************* Appends a new patcher reference to the list of patching positions. *******************************************************************************/ void codegen_add_patch_ref(codegendata *cd, functionptr patcher, voidptr ref, s4 disp) { patchref *pr; s4 branchmpc; branchmpc = cd->mcodeptr - cd->mcodebase; pr = DNEW(patchref); pr->branchpos = branchmpc; pr->disp = disp; pr->patcher = patcher; pr->ref = ref; /* list_add_first(cd->patchrefs, pr); */ pr->next = cd->patchrefs; cd->patchrefs = pr; /* Generate NOPs for opt_shownops. */ if (opt_shownops) PATCHER_NOPS; #if defined(ENABLE_JIT) && (defined(__I386__) || defined(__MIPS__) || defined(__X86_64__)) /* On some architectures the patcher stub call instruction might be longer than the actual instruction generated. On this architectures we store the last patcher call position and after the basic block code generation is completed, we check the range and maybe generate some nop's. */ cd->lastmcodeptr = cd->mcodeptr + PATCHER_CALL_SIZE; #endif } /* methodtree_comparator ******************************************************* Comparator function used for the AVL tree of methods. *******************************************************************************/ static s4 methodtree_comparator(const void *pc, const void *element) { methodtree_element *mte; methodtree_element *mtepc; mte = (methodtree_element *) element; mtepc = (methodtree_element *) pc; /* compare both startpc and endpc of pc, even if they have the same value, otherwise the avl_probe sometimes thinks the element is already in the tree */ #ifdef __S390__ /* On S390 addresses are 31 bit. Compare only 31 bits of value. */ # define ADDR_MASK(a) ((a) & 0x7FFFFFFF) #else # define ADDR_MASK(a) (a) #endif if (ADDR_MASK((long) mte->startpc) <= ADDR_MASK((long) mtepc->startpc) && ADDR_MASK((long) mtepc->startpc) <= ADDR_MASK((long) mte->endpc) && ADDR_MASK((long) mte->startpc) <= ADDR_MASK((long) mtepc->endpc) && ADDR_MASK((long) mtepc->endpc) <= ADDR_MASK((long) mte->endpc)) { return 0; } else if (ADDR_MASK((long) mtepc->startpc) < ADDR_MASK((long) mte->startpc)) { return -1; } else { return 1; } # undef ADDR_MASK } /* codegen_insertmethod ******************************************************** Insert the machine code range of a method into the AVL tree of methods. *******************************************************************************/ void codegen_insertmethod(u1 *startpc, u1 *endpc) { methodtree_element *mte; /* allocate new method entry */ mte = NEW(methodtree_element); mte->startpc = startpc; mte->endpc = endpc; /* this function does not return an error, but asserts for duplicate entries */ avl_insert(methodtree, mte); } /* codegen_get_pv_from_pc ****************************************************** Find the PV for the given PC by searching in the AVL tree of methods. *******************************************************************************/ u1 *codegen_get_pv_from_pc(u1 *pc) { methodtree_element mtepc; methodtree_element *mte; /* allocation of the search structure on the stack is much faster */ mtepc.startpc = pc; mtepc.endpc = pc; mte = avl_find(methodtree, &mtepc); if (mte == NULL) { /* No method was found. Let's dump a stacktrace. */ log_println("We received a SIGSEGV and tried to handle it, but we were"); log_println("unable to find a Java method at:"); log_println(""); #if SIZEOF_VOID_P == 8 log_println("PC=0x%016lx", pc); #else log_println("PC=0x%08x", pc); #endif log_println(""); log_println("Dumping the current stacktrace:"); stacktrace_dump_trace(THREADOBJECT); vm_abort("Exiting..."); } return mte->startpc; } /* codegen_get_pv_from_pc_nocheck ********************************************** Find the PV for the given PC by searching in the AVL tree of methods. This method does not check the return value and is used by the profiler. *******************************************************************************/ u1 *codegen_get_pv_from_pc_nocheck(u1 *pc) { methodtree_element mtepc; methodtree_element *mte; /* allocation of the search structure on the stack is much faster */ mtepc.startpc = pc; mtepc.endpc = pc; mte = avl_find(methodtree, &mtepc); if (mte == NULL) return NULL; else return mte->startpc; } /* codegen_set_replacement_point_notrap **************************************** Record the position of a non-trappable replacement point. *******************************************************************************/ #if defined(ENABLE_REPLACEMENT) #if !defined(NDEBUG) void codegen_set_replacement_point_notrap(codegendata *cd, s4 type) #else void codegen_set_replacement_point_notrap(codegendata *cd) #endif { assert(cd->replacementpoint); assert(cd->replacementpoint->type == type); assert(cd->replacementpoint->flags & RPLPOINT_FLAG_NOTRAP); cd->replacementpoint->pc = (u1*) (ptrint) (cd->mcodeptr - cd->mcodebase); cd->replacementpoint++; } #endif /* defined(ENABLE_REPLACEMENT) */ /* codegen_set_replacement_point *********************************************** Record the position of a trappable replacement point. *******************************************************************************/ #if defined(ENABLE_REPLACEMENT) #if !defined(NDEBUG) void codegen_set_replacement_point(codegendata *cd, s4 type) #else void codegen_set_replacement_point(codegendata *cd) #endif { assert(cd->replacementpoint); assert(cd->replacementpoint->type == type); assert(!(cd->replacementpoint->flags & RPLPOINT_FLAG_NOTRAP)); cd->replacementpoint->pc = (u1*) (ptrint) (cd->mcodeptr - cd->mcodebase); cd->replacementpoint++; /* XXX assert(cd->lastmcodeptr <= cd->mcodeptr); */ cd->lastmcodeptr = cd->mcodeptr + PATCHER_CALL_SIZE; } #endif /* defined(ENABLE_REPLACEMENT) */ /* codegen_finish ************************************************************** Finishes the code generation. A new memory, large enough for both data and code, is allocated and data and code are copied together to their final layout, unresolved jumps are resolved, ... *******************************************************************************/ void codegen_finish(jitdata *jd) { codeinfo *code; codegendata *cd; s4 mcodelen; #if defined(ENABLE_INTRP) s4 ncodelen; #endif s4 alignedmcodelen; jumpref *jr; u1 *epoint; s4 extralen; s4 alignedlen; /* get required compiler data */ code = jd->code; cd = jd->cd; /* prevent compiler warning */ #if defined(ENABLE_INTRP) ncodelen = 0; #endif /* calculate the code length */ mcodelen = (s4) (cd->mcodeptr - cd->mcodebase); #if defined(ENABLE_THREADS) extralen = sizeof(critical_section_node_t) * cd->threadcritcount; #else extralen = 0; #endif #if defined(ENABLE_STATISTICS) if (opt_stat) { count_code_len += mcodelen; count_data_len += cd->dseglen; } #endif alignedmcodelen = MEMORY_ALIGN(mcodelen, MAX_ALIGN); #if defined(ENABLE_INTRP) if (opt_intrp) ncodelen = cd->ncodeptr - cd->ncodebase; else { ncodelen = 0; /* avoid compiler warning */ } #endif cd->dseglen = MEMORY_ALIGN(cd->dseglen, MAX_ALIGN); alignedlen = alignedmcodelen + cd->dseglen; #if defined(ENABLE_INTRP) if (opt_intrp) { alignedlen += ncodelen; } #endif /* allocate new memory */ code->mcodelength = mcodelen + cd->dseglen; code->mcode = CNEW(u1, alignedlen + extralen); /* set the entrypoint of the method */ assert(code->entrypoint == NULL); code->entrypoint = epoint = (code->mcode + cd->dseglen); /* fill the data segment (code->entrypoint must already be set!) */ dseg_finish(jd); /* copy code to the new location */ MCOPY((void *) code->entrypoint, cd->mcodebase, u1, mcodelen); #if defined(ENABLE_INTRP) /* relocate native dynamic superinstruction code (if any) */ if (opt_intrp) { cd->mcodebase = code->entrypoint; if (ncodelen > 0) { u1 *ncodebase = code->mcode + cd->dseglen + alignedmcodelen; MCOPY((void *) ncodebase, cd->ncodebase, u1, ncodelen); /* flush the instruction and data caches */ md_cacheflush(ncodebase, ncodelen); /* set some cd variables for dynamic_super_rerwite */ cd->ncodebase = ncodebase; } else { cd->ncodebase = NULL; } dynamic_super_rewrite(cd); } #endif /* jump table resolving */ for (jr = cd->jumpreferences; jr != NULL; jr = jr->next) *((functionptr *) ((ptrint) epoint + jr->tablepos)) = (functionptr) ((ptrint) epoint + (ptrint) jr->target->mpc); /* line number table resolving */ { linenumberref *lr; ptrint lrtlen = 0; ptrint target; for (lr = cd->linenumberreferences; lr != NULL; lr = lr->next) { lrtlen++; target = lr->targetmpc; /* if the entry contains an mcode pointer (normal case), resolve it */ /* (see doc/inlining_stacktrace.txt for details) */ if (lr->linenumber >= -2) { target += (ptrint) epoint; } *((functionptr *) ((ptrint) epoint + (ptrint) lr->tablepos)) = (functionptr) target; } *((functionptr *) ((ptrint) epoint + cd->linenumbertablestartpos)) = (functionptr) ((ptrint) epoint + cd->linenumbertab); *((ptrint *) ((ptrint) epoint + cd->linenumbertablesizepos)) = lrtlen; } #if defined(ENABLE_REPLACEMENT) /* replacement point resolving */ { int i; rplpoint *rp; code->replacementstubs += (ptrint) epoint; rp = code->rplpoints; for (i=0; irplpointcount; ++i, ++rp) { rp->pc = (u1*) ((ptrint) epoint + (ptrint) rp->pc); } } #endif /* defined(ENABLE_REPLACEMENT) */ /* add method into methodtree to find the entrypoint */ codegen_insertmethod(code->entrypoint, code->entrypoint + mcodelen); #if defined(__I386__) || defined(__X86_64__) || defined(__XDSPCORE__) || defined(__M68K__) || defined(ENABLE_INTRP) /* resolve data segment references */ dseg_resolve_datareferences(jd); #endif #if defined(ENABLE_THREADS) { critical_section_node_t *n = (critical_section_node_t *) ((ptrint) code->mcode + alignedlen); s4 i; codegen_critical_section_t *nt = cd->threadcrit; for (i = 0; i < cd->threadcritcount; i++) { n->mcodebegin = (u1 *) (ptrint) code->mcode + nt->mcodebegin; n->mcodeend = (u1 *) (ptrint) code->mcode + nt->mcodeend; n->mcoderestart = (u1 *) (ptrint) code->mcode + nt->mcoderestart; critical_register_critical_section(n); n++; nt = nt->next; } } #endif /* flush the instruction and data caches */ md_cacheflush(code->mcode, code->mcodelength); } /* codegen_createnativestub **************************************************** Wrapper for createnativestub. Returns: the codeinfo representing the stub code. *******************************************************************************/ codeinfo *codegen_createnativestub(functionptr f, methodinfo *m) { jitdata *jd; codeinfo *code; s4 dumpsize; methoddesc *md; methoddesc *nmd; s4 nativeparams; /* mark dump memory */ dumpsize = dump_size(); jd = DNEW(jitdata); jd->m = m; jd->cd = DNEW(codegendata); jd->rd = DNEW(registerdata); jd->flags = 0; /* Allocate codeinfo memory from the heap as we need to keep them. */ jd->code = code_codeinfo_new(m); /* XXX check allocation */ /* get required compiler data */ code = jd->code; /* set the flags for the current JIT run */ #if defined(ENABLE_PROFILING) if (opt_prof) jd->flags |= JITDATA_FLAG_INSTRUMENT; #endif if (opt_verbosecall) jd->flags |= JITDATA_FLAG_VERBOSECALL; /* setup code generation stuff */ #if defined(ENABLE_JIT) # if defined(ENABLE_INTRP) if (!opt_intrp) # endif reg_setup(jd); #endif codegen_setup(jd); /* create new method descriptor with additional native parameters */ md = m->parseddesc; nativeparams = (m->flags & ACC_STATIC) ? 2 : 1; nmd = (methoddesc *) DMNEW(u1, sizeof(methoddesc) - sizeof(typedesc) + md->paramcount * sizeof(typedesc) + nativeparams * sizeof(typedesc)); nmd->paramcount = md->paramcount + nativeparams; nmd->params = DMNEW(paramdesc, nmd->paramcount); nmd->paramtypes[0].type = TYPE_ADR; /* add environment pointer */ if (m->flags & ACC_STATIC) nmd->paramtypes[1].type = TYPE_ADR; /* add class pointer */ MCOPY(nmd->paramtypes + nativeparams, md->paramtypes, typedesc, md->paramcount); #if defined(ENABLE_JIT) # if defined(ENABLE_INTRP) if (!opt_intrp) # endif /* pre-allocate the arguments for the native ABI */ md_param_alloc_native(nmd); #endif /* generate the code */ #if defined(ENABLE_JIT) # if defined(ENABLE_INTRP) if (opt_intrp) code->entrypoint = intrp_createnativestub(f, jd, nmd); else # endif code->entrypoint = createnativestub(f, jd, nmd); #else code->entrypoint = intrp_createnativestub(f, jd, nmd); #endif #if defined(ENABLE_STATISTICS) if (opt_stat) count_nstub_len += code->mcodelength; #endif #if !defined(NDEBUG) /* disassemble native stub */ if (opt_shownativestub) { #if defined(ENABLE_DISASSEMBLER) codegen_disassemble_nativestub(m, (u1 *) (ptrint) code->entrypoint, (u1 *) (ptrint) code->entrypoint + (code->mcodelength - jd->cd->dseglen)); #endif /* show data segment */ if (opt_showddatasegment) dseg_display(jd); } #endif /* !defined(NDEBUG) */ /* release memory */ dump_release(dumpsize); /* return native stub code */ return code; } /* codegen_disassemble_nativestub ********************************************** Disassembles the generated native stub. *******************************************************************************/ #if defined(ENABLE_DISASSEMBLER) void codegen_disassemble_nativestub(methodinfo *m, u1 *start, u1 *end) { printf("Native stub: "); utf_fprint_printable_ascii_classname(stdout, m->class->name); printf("."); utf_fprint_printable_ascii(stdout, m->name); utf_fprint_printable_ascii(stdout, m->descriptor); printf("\n\nLength: %d\n\n", (s4) (end - start)); DISASSEMBLE(start, end); } #endif /* codegen_start_native_call *************************************************** Prepares the stuff required for a native (JNI) function call: - adds a stackframe info structure to the chain, for stacktraces - prepares the local references table on the stack The layout of the native stub stackframe should look like this: +---------------------------+ <- SP (of parent Java function) | return address | +---------------------------+ | | | stackframe info structure | | | +---------------------------+ | | | local references table | | | +---------------------------+ | | | arguments (if any) | | | +---------------------------+ <- SP (native stub) *******************************************************************************/ void codegen_start_native_call(u1 *datasp, u1 *pv, u1 *sp, u1 *ra) { stackframeinfo *sfi; localref_table *lrt; /* get data structures from stack */ sfi = (stackframeinfo *) (datasp - sizeof(stackframeinfo)); lrt = (localref_table *) (datasp - sizeof(stackframeinfo) - sizeof(localref_table)); /* add a stackframeinfo to the chain */ stacktrace_create_native_stackframeinfo(sfi, pv, sp, ra); #if defined(ENABLE_JAVASE) /* add current JNI local references table to this thread */ lrt->capacity = LOCALREFTABLE_CAPACITY; lrt->used = 0; lrt->localframes = 1; lrt->prev = LOCALREFTABLE; /* clear the references array (memset is faster the a for-loop) */ MSET(lrt->refs, 0, java_objectheader*, LOCALREFTABLE_CAPACITY); LOCALREFTABLE = lrt; #endif } /* codegen_finish_native_call ************************************************** Removes the stuff required for a native (JNI) function call. Additionally it checks for an exceptions and in case, get the exception object and clear the pointer. *******************************************************************************/ java_objectheader *codegen_finish_native_call(u1 *datasp) { stackframeinfo *sfi; stackframeinfo **psfi; localref_table *lrt; localref_table *plrt; s4 localframes; java_objectheader *e; /* get data structures from stack */ sfi = (stackframeinfo *) (datasp - sizeof(stackframeinfo)); lrt = (localref_table *) (datasp - sizeof(stackframeinfo) - sizeof(localref_table)); /* remove current stackframeinfo from chain */ psfi = &STACKFRAMEINFO; *psfi = sfi->prev; #if defined(ENABLE_JAVASE) /* release JNI local references tables for this thread */ lrt = LOCALREFTABLE; /* release all current local frames */ for (localframes = lrt->localframes; localframes >= 1; localframes--) { /* get previous frame */ plrt = lrt->prev; /* Clear all reference entries (only for tables allocated on the Java heap). */ if (localframes > 1) MSET(&lrt->refs[0], 0, java_objectheader*, lrt->capacity); lrt->prev = NULL; /* set new local references table */ lrt = plrt; } /* now store the previous local frames in the thread structure */ LOCALREFTABLE = lrt; #endif /* get the exception and return it */ e = exceptions_get_and_clear_exception(); return e; } /* removecompilerstub ********************************************************** Deletes a compilerstub from memory (simply by freeing it). *******************************************************************************/ void removecompilerstub(u1 *stub) { /* pass size 1 to keep the intern function happy */ CFREE((void *) stub, 1); } /* removenativestub ************************************************************ Removes a previously created native-stub from memory. *******************************************************************************/ void removenativestub(u1 *stub) { /* pass size 1 to keep the intern function happy */ CFREE((void *) stub, 1); } /* codegen_reg_of_var ********************************************************** This function determines a register, to which the result of an operation should go, when it is ultimatively intended to store the result in pseudoregister v. If v is assigned to an actual register, this register will be returned. Otherwise (when v is spilled) this function returns tempregnum. If not already done, regoff and flags are set in the stack location. On ARM we have to check if a long/double variable is splitted across reg/stack (HIGH_REG == REG_SPLIT). We return the actual register of v for LOW_REG and the tempregnum for HIGH_REG in such cases. (michi 2005/07/24) *******************************************************************************/ s4 codegen_reg_of_var(u2 opcode, varinfo *v, s4 tempregnum) { #if 0 /* Do we have to generate a conditional move? Yes, then always return the temporary register. The real register is identified during the store. */ if (opcode & ICMD_CONDITION_MASK) return tempregnum; #endif if (!(v->flags & INMEMORY)) { #if defined(__ARM__) && defined(__ARMEL__) if (IS_2_WORD_TYPE(v->type) && (GET_HIGH_REG(v->vv.regoff) == REG_SPLIT)) return PACK_REGS(GET_LOW_REG(v->vv.regoff), GET_HIGH_REG(tempregnum)); #endif #if defined(__ARM__) && defined(__ARMEB__) if (IS_2_WORD_TYPE(v->type) && (GET_LOW_REG(v->vv.regoff) == REG_SPLIT)) return PACK_REGS(GET_LOW_REG(tempregnum), GET_HIGH_REG(v->vv.regoff)); #endif return v->vv.regoff; } #if defined(ENABLE_STATISTICS) if (opt_stat) count_spills_read++; #endif return tempregnum; } /* codegen_reg_of_dst ********************************************************** This function determines a register, to which the result of an operation should go, when it is ultimatively intended to store the result in iptr->dst.var. If dst.var is assigned to an actual register, this register will be returned. Otherwise (when it is spilled) this function returns tempregnum. If not already done, regoff and flags are set in the stack location. On ARM we have to check if a long/double variable is splitted across reg/stack (HIGH_REG == REG_SPLIT). We return the actual register of dst.var for LOW_REG and the tempregnum for HIGH_REG in such cases. (michi 2005/07/24) *******************************************************************************/ s4 codegen_reg_of_dst(jitdata *jd, instruction *iptr, s4 tempregnum) { return codegen_reg_of_var(iptr->opc, VAROP(iptr->dst), tempregnum); } #if defined(ENABLE_THREADS) void codegen_threadcritrestart(codegendata *cd, int offset) { cd->threadcritcurrent.mcoderestart = offset; } void codegen_threadcritstart(codegendata *cd, int offset) { cd->threadcritcurrent.mcodebegin = offset; } void codegen_threadcritstop(codegendata *cd, int offset) { cd->threadcritcurrent.next = cd->threadcrit; cd->threadcritcurrent.mcodeend = offset; cd->threadcrit = DNEW(codegen_critical_section_t); *(cd->threadcrit) = cd->threadcritcurrent; cd->threadcritcount++; } #endif /* * These are local overrides for various environment variables in Emacs. * Please do not remove this and leave it at the end of the file, where * Emacs will automagically detect them. * --------------------------------------------------------------------- * Local variables: * mode: c * indent-tabs-mode: t * c-basic-offset: 4 * tab-width: 4 * End: * vim:noexpandtab:sw=4:ts=4: */