/****************************************************************************** * xc.h * * A library for low-level access to the Xen control interfaces. * * Copyright (c) 2003-2004, K A Fraser. */ #ifndef __XC_H__ #define __XC_H__ #include typedef uint8_t u8; typedef uint16_t u16; typedef uint32_t u32; typedef uint64_t u64; typedef int8_t s8; typedef int16_t s16; typedef int32_t s32; typedef int64_t s64; #include #include #include #include #include /* * DEFINITIONS FOR CPU BARRIERS */ #if defined(__i386__) #define mb() __asm__ __volatile__ ( "lock; addl $0,0(%%esp)" : : : "memory" ) #define rmb() __asm__ __volatile__ ( "lock; addl $0,0(%%esp)" : : : "memory" ) #define wmb() __asm__ __volatile__ ( "" : : : "memory") #elif defined(__x86_64__) #define mb() __asm__ __volatile__ ( "mfence" : : : "memory") #define rmb() __asm__ __volatile__ ( "lfence" : : : "memory") #define wmb() __asm__ __volatile__ ( "" : : : "memory") #else #error "Define barriers" #endif /* * INITIALIZATION FUNCTIONS */ /** * This function opens a handle to the hypervisor interface. This function can * be called multiple times within a single process. Multiple processes can * have an open hypervisor interface at the same time. * * Each call to this function should have a corresponding call to * xc_interface_close(). * * This function can fail if the caller does not have superuser permission or * if a Xen-enabled kernel is not currently running. * * @return a handle to the hypervisor interface or -1 on failure */ int xc_interface_open(void); /** * This function closes an open hypervisor interface. * * This function can fail if the handle does not represent an open interface or * if there were problems closing the interface. * * @parm xc_handle a handle to an open hypervisor interface * @return 0 on success, -1 otherwise. */ int xc_interface_close(int xc_handle); /* * DOMAIN DEBUGGING FUNCTIONS */ typedef struct xc_core_header { unsigned int xch_magic; unsigned int xch_nr_vcpus; unsigned int xch_nr_pages; unsigned int xch_ctxt_offset; unsigned int xch_index_offset; unsigned int xch_pages_offset; } xc_core_header_t; long xc_ptrace(enum __ptrace_request request, u32 domid, long addr, long data); long xc_ptrace_core(enum __ptrace_request request, u32 domid, long addr, long data); int xc_waitdomain(int domain, int *status, int options); int xc_waitdomain_core(int domain, int *status, int options); /* * DOMAIN MANAGEMENT FUNCTIONS */ typedef struct { u32 domid; unsigned int cpu; unsigned int dying:1, crashed:1, shutdown:1, paused:1, blocked:1, running:1; unsigned int shutdown_reason; /* only meaningful if shutdown==1 */ unsigned long nr_pages; unsigned long shared_info_frame; u64 cpu_time; unsigned long max_memkb; } xc_dominfo_t; typedef dom0_getdomaininfo_t xc_domaininfo_t; int xc_domain_create(int xc_handle, unsigned int mem_kb, int cpu, float cpu_weight, u32 *pdomid); int xc_domain_dumpcore(int xc_handle, u32 domid, const char *corename); /** * This function pauses a domain. A paused domain still exists in memory * however it does not receive any timeslices from the hypervisor. * * @parm xc_handle a handle to an open hypervisor interface * @parm domid the domain id to pause * @return 0 on success, -1 on failure. */ int xc_domain_pause(int xc_handle, u32 domid); /** * This function unpauses a domain. The domain should have been previously * paused. * * @parm xc_handle a handle to an open hypervisor interface * @parm domid the domain id to unpause * return 0 on success, -1 on failure */ int xc_domain_unpause(int xc_handle, u32 domid); /** * This function will destroy a domain. Destroying a domain removes the domain * completely from memory. This function should be called after sending the * domain a SHUTDOWN control message to free up the domain resources. * * @parm xc_handle a handle to an open hypervisor interface * @parm domid the domain id to destroy * @return 0 on success, -1 on failure */ int xc_domain_destroy(int xc_handle, u32 domid); int xc_domain_pincpu(int xc_handle, u32 domid, int cpu); /** * This function will return information about one or more domains. * * @parm xc_handle a handle to an open hypervisor interface * @parm first_domid the first domain to enumerate information from. Domains * are currently enumerate in order of creation. * @parm max_doms the number of elements in info * @parm info an array of max_doms size that will contain the information for * the enumerated domains. * @return the number of domains enumerated or -1 on error */ int xc_domain_getinfo(int xc_handle, u32 first_domid, unsigned int max_doms, xc_dominfo_t *info); /** * This function returns information about one domain. This information is * more detailed than the information from xc_domain_getinfo(). * * @parm xc_handle a handle to an open hypervisor interface * @parm domid the domain to get information from * @parm info a pointer to an xc_domaininfo_t to store the domain information * @parm ctxt a pointer to a structure to store the execution context of the * domain * @return 0 on success, -1 on failure */ int xc_domain_getfullinfo(int xc_handle, u32 domid, u32 vcpu, xc_domaininfo_t *info, vcpu_guest_context_t *ctxt); int xc_domain_setcpuweight(int xc_handle, u32 domid, float weight); long long xc_domain_get_cpu_usage(int xc_handle, domid_t domid, int vcpu); typedef dom0_shadow_control_stats_t xc_shadow_control_stats_t; int xc_shadow_control(int xc_handle, u32 domid, unsigned int sop, unsigned long *dirty_bitmap, unsigned long pages, xc_shadow_control_stats_t *stats); #define XCFLAGS_VERBOSE 1 #define XCFLAGS_LIVE 2 #define XCFLAGS_DEBUG 4 #define XCFLAGS_CONFIGURE 8 struct XcIOContext; /** * This function will save a domain running Linux to an IO context. This * IO context is currently a private interface making this function difficult * to call. It's interface will likely change in the future. * * @parm xc_handle a handle to an open hypervisor interface * @parm ioctxt the IO context to save a domain to * @return 0 on success, -1 on failure */ int xc_linux_save(int xc_handle, struct XcIOContext *ioctxt); /** * This function will restore a saved domain running Linux to an IO context. * Like xc_linux_save(), this function uses a parameter who's structure is * privately defined. It's interface will also likely change. * * @parm xc_handle a handle to an open hypervisor interface * @parm ioctxt the IO context to restore a domain from * @return 0 on success, -1 on failure */ int xc_linux_restore(int xc_handle, struct XcIOContext *ioctxt); int xc_linux_build(int xc_handle, u32 domid, const char *image_name, const char *ramdisk_name, const char *cmdline, unsigned int control_evtchn, unsigned long flags, unsigned int vcpus); int xc_plan9_build (int xc_handle, u32 domid, const char *image_name, const char *cmdline, unsigned int control_evtchn, unsigned long flags); struct mem_map; int xc_vmx_build(int xc_handle, u32 domid, int memsize, const char *image_name, struct mem_map *memmap, const char *ramdisk_name, const char *cmdline, unsigned int control_evtchn, unsigned long flags); int xc_bvtsched_global_set(int xc_handle, unsigned long ctx_allow); int xc_bvtsched_domain_set(int xc_handle, u32 domid, u32 mcuadv, int warpback, s32 warpvalue, long long warpl, long long warpu); int xc_bvtsched_global_get(int xc_handle, unsigned long *ctx_allow); int xc_bvtsched_domain_get(int xc_handle, u32 domid, u32 *mcuadv, int *warpback, s32 *warpvalue, long long *warpl, long long *warpu); typedef evtchn_status_t xc_evtchn_status_t; /* * EVENT CHANNEL FUNCTIONS */ /** * This function allocates an unbound port. Ports are named endpoints used for * interdomain communication. This function is most useful in opening a * well-known port within a domain to receive events on. * * @parm xc_handle a handle to an open hypervisor interface * @parm dom the ID of the domain. This maybe DOMID_SELF * @parm port a pointer to a port. This is an in/out parameter. If *port is * 0, then a new port will be assigned, if port is > 0 then that * port is allocated if the port is unallocated. * @return 0 on success, -1 on failure */ int xc_evtchn_alloc_unbound(int xc_handle, u32 dom, int *port); /** * This function creates a pair of ports between two domains. A port can only * be bound once within a domain. * * @parm xc_handle a handle to an open hypervisor interface * @parm dom1 one of the two domains to connect. Can be DOMID_SELF. * @parm dom2 the other domain to connect. Can be DOMID_SELF. * @parm port1 an in/out parameter. If > 0, then try to connect *port. If * 0, then allocate a new port and store the port in *port. * @parm port2 the port connected on port2. This parameter behaves the same * way as port1. * @return 0 on success, -1 on error. */ int xc_evtchn_bind_interdomain(int xc_handle, u32 dom1, u32 dom2, int *port1, int *port2); int xc_evtchn_bind_virq(int xc_handle, int virq, int *port); /** * This function will close a single port on an event channel. * * @parm xc_handle a handle to an open hypervisor interface * @parm dom the domain that the port exists on. May be DOMID_SELF. * @parm port the port to close * @return 0 on success, -1 on error */ int xc_evtchn_close(int xc_handle, u32 dom, /* may be DOMID_SELF */ int port); /** * This function generates a notify event on a bound port. * * Notifies can be read within Linux by opening /dev/xen/evtchn and reading * a 16 bit value. The result will be the port the event occurred on. When * events occur, the port is masked until the 16 bit port value is written back * to the file. When /dev/xen/evtchn is opened, it has to be bound via an * ioctl to each port to listen on. The ioctl for binding is _IO('E', 2). The * parameter is the port to listen on. * * @parm xc_handle a handle to an open hypervisor interface * @parm local_port the port to generate the notify on * @return 0 on success, -1 on error */ int xc_evtchn_send(int xc_handle, int local_port); int xc_evtchn_status(int xc_handle, u32 dom, /* may be DOMID_SELF */ int port, xc_evtchn_status_t *status); int xc_physdev_pci_access_modify(int xc_handle, u32 domid, int bus, int dev, int func, int enable); int xc_readconsolering(int xc_handle, char *str, unsigned int max_chars, int clear); typedef dom0_physinfo_t xc_physinfo_t; int xc_physinfo(int xc_handle, xc_physinfo_t *info); int xc_sched_id(int xc_handle, int *sched_id); int xc_domain_setmaxmem(int xc_handle, u32 domid, unsigned int max_memkb); typedef dom0_perfc_desc_t xc_perfc_desc_t; /* IMPORTANT: The caller is responsible for mlock()'ing the @desc array. */ int xc_perfc_control(int xc_handle, u32 op, xc_perfc_desc_t *desc); /* read/write msr */ long long xc_msr_read(int xc_handle, int cpu_mask, int msr); int xc_msr_write(int xc_handle, int cpu_mask, int msr, unsigned int low, unsigned int high); /** * Memory maps a range within one domain to a local address range. Mappings * should be unmapped with munmap and should follow the same rules as mmap * regarding page alignment. * * In Linux, the ring queue for the control channel is accessible by mapping * the shared_info_frame (from xc_domain_getinfo()) + 2048. The structure * stored there is of type control_if_t. * * @parm xc_handle a handle on an open hypervisor interface * @parm dom the domain to map memory from * @parm size the amount of memory to map (in multiples of page size) * @parm prot same flag as in mmap(). * @parm mfn the frame address to map. */ void *xc_map_foreign_range(int xc_handle, u32 dom, int size, int prot, unsigned long mfn ); void *xc_map_foreign_batch(int xc_handle, u32 dom, int prot, unsigned long *arr, int num ); int xc_get_pfn_list(int xc_handle, u32 domid, unsigned long *pfn_buf, unsigned long max_pfns); /*\ * GRANT TABLE FUNCTIONS \*/ /** * This function opens a handle to the more restricted grant table hypervisor * interface. This may be used where the standard interface is not * available because the domain is not privileged. * This function can be called multiple times within a single process. * Multiple processes can have an open hypervisor interface at the same time. * * Each call to this function should have a corresponding call to * xc_grant_interface_close(). * * This function can fail if a Xen-enabled kernel is not currently running. * * @return a handle to the hypervisor grant table interface or -1 on failure */ int xc_grant_interface_open(void); /** * This function closes an open grant table hypervisor interface. * * This function can fail if the handle does not represent an open interface or * if there were problems closing the interface. * * @parm xc_handle a handle to an open grant table hypervisor interface * @return 0 on success, -1 otherwise. */ int xc_grant_interface_close(int xc_handle); int xc_gnttab_map_grant_ref(int xc_handle, memory_t host_virt_addr, u32 dom, u16 ref, u16 flags, s16 *handle, memory_t *dev_bus_addr); int xc_gnttab_unmap_grant_ref(int xc_handle, memory_t host_virt_addr, memory_t dev_bus_addr, u16 handle, s16 *status); int xc_gnttab_setup_table(int xc_handle, u32 dom, u16 nr_frames, s16 *status, memory_t **frame_list); /* Grant debug builds only: */ int xc_gnttab_dump_table(int xc_handle, u32 dom, s16 *status); #endif /* __XC_H__ */ d='n391' href='#n391'>391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 
/*
 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
 * Released under the terms of the GNU GPL v2.0.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define LKC_DIRECT_LINK
#include "lkc.h"

#define DEBUG_EXPR	0

struct expr *expr_alloc_symbol(struct symbol *sym)
{
	struct expr *e = malloc(sizeof(*e));
	memset(e, 0, sizeof(*e));
	e->type = E_SYMBOL;
	e->left.sym = sym;
	return e;
}

struct expr *expr_alloc_one(enum expr_type type, struct expr *ce)
{
	struct expr *e = malloc(sizeof(*e));
	memset(e, 0, sizeof(*e));
	e->type = type;
	e->left.expr = ce;
	return e;
}

struct expr *expr_alloc_two(enum expr_type type, struct expr *e1, struct expr *e2)
{
	struct expr *e = malloc(sizeof(*e));
	memset(e, 0, sizeof(*e));
	e->type = type;
	e->left.expr = e1;
	e->right.expr = e2;
	return e;
}

struct expr *expr_alloc_comp(enum expr_type type, struct symbol *s1, struct symbol *s2)
{
	struct expr *e = malloc(sizeof(*e));
	memset(e, 0, sizeof(*e));
	e->type = type;
	e->left.sym = s1;
	e->right.sym = s2;
	return e;
}

struct expr *expr_alloc_and(struct expr *e1, struct expr *e2)
{
	if (!e1)
		return e2;
	return e2 ? expr_alloc_two(E_AND, e1, e2) : e1;
}

struct expr *expr_alloc_or(struct expr *e1, struct expr *e2)
{
	if (!e1)
		return e2;
	return e2 ? expr_alloc_two(E_OR, e1, e2) : e1;
}

struct expr *expr_copy(struct expr *org)
{
	struct expr *e;

	if (!org)
		return NULL;

	e = malloc(sizeof(*org));
	memcpy(e, org, sizeof(*org));
	switch (org->type) {
	case E_SYMBOL:
		e->left = org->left;
		break;
	case E_NOT:
		e->left.expr = expr_copy(org->left.expr);
		break;
	case E_EQUAL:
	case E_UNEQUAL:
		e->left.sym = org->left.sym;
		e->right.sym = org->right.sym;
		break;
	case E_AND:
	case E_OR:
	case E_CHOICE:
		e->left.expr = expr_copy(org->left.expr);
		e->right.expr = expr_copy(org->right.expr);
		break;
	default:
		printf("can't copy type %d\n", e->type);
		free(e);
		e = NULL;
		break;
	}

	return e;
}

void expr_free(struct expr *e)
{
	if (!e)
		return;

	switch (e->type) {
	case E_SYMBOL:
		break;
	case E_NOT:
		expr_free(e->left.expr);
		return;
	case E_EQUAL:
	case E_UNEQUAL:
		break;
	case E_OR:
	case E_AND:
		expr_free(e->left.expr);
		expr_free(e->right.expr);
		break;
	default:
		printf("how to free type %d?\n", e->type);
		break;
	}
	free(e);
}

static int trans_count;

#define e1 (*ep1)
#define e2 (*ep2)

static void __expr_eliminate_eq(enum expr_type type, struct expr **ep1, struct expr **ep2)
{
	if (e1->type == type) {
		__expr_eliminate_eq(type, &e1->left.expr, &e2);
		__expr_eliminate_eq(type, &e1->right.expr, &e2);
		return;
	}
	if (e2->type == type) {
		__expr_eliminate_eq(type, &e1, &e2->left.expr);
		__expr_eliminate_eq(type, &e1, &e2->right.expr);
		return;
	}
	if (e1->type == E_SYMBOL && e2->type == E_SYMBOL &&
	    e1->left.sym == e2->left.sym && (e1->left.sym->flags & (SYMBOL_YES|SYMBOL_NO)))
		return;
	if (!expr_eq(e1, e2))
		return;
	trans_count++;
	expr_free(e1); expr_free(e2);
	switch (type) {
	case E_OR:
		e1 = expr_alloc_symbol(&symbol_no);
		e2 = expr_alloc_symbol(&symbol_no);
		break;
	case E_AND:
		e1 = expr_alloc_symbol(&symbol_yes);
		e2 = expr_alloc_symbol(&symbol_yes);
		break;
	default:
		;
	}
}

void expr_eliminate_eq(struct expr **ep1, struct expr **ep2)
{
	if (!e1 || !e2)
		return;
	switch (e1->type) {
	case E_OR:
	case E_AND:
		__expr_eliminate_eq(e1->type, ep1, ep2);
	default:
		;
	}
	if (e1->type != e2->type) switch (e2->type) {
	case E_OR:
	case E_AND:
		__expr_eliminate_eq(e2->type, ep1, ep2);
	default:
		;
	}
	e1 = expr_eliminate_yn(e1);
	e2 = expr_eliminate_yn(e2);
}

#undef e1
#undef e2

int expr_eq(struct expr *e1, struct expr *e2)
{
	int res, old_count;

	if (e1->type != e2->type)
		return 0;
	switch (e1->type) {
	case E_EQUAL:
	case E_UNEQUAL:
		return e1->left.sym == e2->left.sym && e1->right.sym == e2->right.sym;
	case E_SYMBOL:
		return e1->left.sym == e2->left.sym;
	case E_NOT:
		return expr_eq(e1->left.expr, e2->left.expr);
	case E_AND:
	case E_OR:
		e1 = expr_copy(e1);
		e2 = expr_copy(e2);
		old_count = trans_count;
		expr_eliminate_eq(&e1, &e2);
		res = (e1->type == E_SYMBOL && e2->type == E_SYMBOL &&
		       e1->left.sym == e2->left.sym);
		expr_free(e1);
		expr_free(e2);
		trans_count = old_count;
		return res;
	case E_CHOICE:
	case E_RANGE:
	case E_NONE:
		/* panic */;
	}

	if (DEBUG_EXPR) {
		expr_fprint(e1, stdout);
		printf(" = ");
		expr_fprint(e2, stdout);
		printf(" ?\n");
	}

	return 0;
}

struct expr *expr_eliminate_yn(struct expr *e)
{
	struct expr *tmp;

	if (e) switch (e->type) {
	case E_AND:
		e->left.expr = expr_eliminate_yn(e->left.expr);
		e->right.expr = expr_eliminate_yn(e->right.expr);
		if (e->left.expr->type == E_SYMBOL) {
			if (e->left.expr->left.sym == &symbol_no) {
				expr_free(e->left.expr);
				expr_free(e->right.expr);
				e->type = E_SYMBOL;
				e->left.sym = &symbol_no;
				e->right.expr = NULL;
				return e;
			} else if (e->left.expr->left.sym == &symbol_yes) {
				free(e->left.expr);
				tmp = e->right.expr;
				*e = *(e->right.expr);
				free(tmp);
				return e;
			}
		}
		if (e->right.expr->type == E_SYMBOL) {
			if (e->right.expr->left.sym == &symbol_no) {
				expr_free(e->left.expr);
				expr_free(e->right.expr);
				e->type = E_SYMBOL;
				e->left.sym = &symbol_no;
				e->right.expr = NULL;
				return e;
			} else if (e->right.expr->left.sym == &symbol_yes) {
				free(e->right.expr);
				tmp = e->left.expr;
				*e = *(e->left.expr);
				free(tmp);
				return e;
			}
		}
		break;
	case E_OR:
		e->left.expr = expr_eliminate_yn(e->left.expr);
		e->right.expr = expr_eliminate_yn(e->right.expr);
		if (e->left.expr->type == E_SYMBOL) {
			if (e->left.expr->left.sym == &symbol_no) {
				free(e->left.expr);
				tmp = e->right.expr;
				*e = *(e->right.expr);
				free(tmp);
				return e;
			} else if (e->left.expr->left.sym == &symbol_yes) {
				expr_free(e->left.expr);
				expr_free(e->right.expr);
				e->type = E_SYMBOL;
				e->left.sym = &symbol_yes;
				e->right.expr = NULL;
				return e;
			}
		}
		if (e->right.expr->type == E_SYMBOL) {
			if (e->right.expr->left.sym == &symbol_no) {
				free(e->right.expr);
				tmp = e->left.expr;
				*e = *(e->left.expr);
				free(tmp);
				return e;
			} else if (e->right.expr->left.sym == &symbol_yes) {
				expr_free(e->left.expr);
				expr_free(e->right.expr);
				e->type = E_SYMBOL;
				e->left.sym = &symbol_yes;
				e->right.expr = NULL;
				return e;
			}
		}
		break;
	default:
		;
	}
	return e;
}

/*
 * bool FOO!=n => FOO
 */
struct expr *expr_trans_bool(struct expr *e)
{
	if (!e)
		return NULL;
	switch (e->type) {
	case E_AND:
	case E_OR:
	case E_NOT:
		e->left.expr = expr_trans_bool(e->left.expr);
		e->right.expr = expr_trans_bool(e->right.expr);
		break;
	case E_UNEQUAL:
		// FOO!=n -> FOO
		if (e->left.sym->type == S_TRISTATE) {
			if (e->right.sym == &symbol_no) {
				e->type = E_SYMBOL;
				e->right.sym = NULL;
			}
		}
		break;
	default:
		;
	}
	return e;
}

/*
 * e1 || e2 -> ?
 */
struct expr *expr_join_or(struct expr *e1, struct expr *e2)
{
	struct expr *tmp;
	struct symbol *sym1, *sym2;

	if (expr_eq(e1, e2))
		return expr_copy(e1);
	if (e1->type != E_EQUAL && e1->type != E_UNEQUAL && e1->type != E_SYMBOL && e1->type != E_NOT)
		return NULL;
	if (e2->type != E_EQUAL && e2->type != E_UNEQUAL && e2->type != E_SYMBOL && e2->type != E_NOT)
		return NULL;
	if (e1->type == E_NOT) {
		tmp = e1->left.expr;
		if (tmp->type != E_EQUAL && tmp->type != E_UNEQUAL && tmp->type != E_SYMBOL)
			return NULL;
		sym1 = tmp->left.sym;
	} else
		sym1 = e1->left.sym;
	if (e2->type == E_NOT) {
		if (e2->left.expr->type != E_SYMBOL)
			return NULL;
		sym2 = e2->left.expr->left.sym;
	} else
		sym2 = e2->left.sym;
	if (sym1 != sym2)
		return NULL;
	if (sym1->type != S_BOOLEAN && sym1->type != S_TRISTATE)
		return NULL;
	if (sym1->type == S_TRISTATE) {
		if (e1->type == E_EQUAL && e2->type == E_EQUAL &&
		    ((e1->right.sym == &symbol_yes && e2->right.sym == &symbol_mod) ||
		     (e1->right.sym == &symbol_mod && e2->right.sym == &symbol_yes))) {
			// (a='y') || (a='m') -> (a!='n')
			return expr_alloc_comp(E_UNEQUAL, sym1, &symbol_no);
		}
		if (e1->type == E_EQUAL && e2->type == E_EQUAL &&
		    ((e1->right.sym == &symbol_yes && e2->right.sym == &symbol_no) ||
		     (e1->right.sym == &symbol_no && e2->right.sym == &symbol_yes))) {
			// (a='y') || (a='n') -> (a!='m')
			return expr_alloc_comp(E_UNEQUAL, sym1, &symbol_mod);
		}
		if (e1->type == E_EQUAL && e2->type == E_EQUAL &&
		    ((e1->right.sym == &symbol_mod && e2->right.sym == &symbol_no) ||
		     (e1->right.sym == &symbol_no && e2->right.sym == &symbol_mod))) {
			// (a='m') || (a='n') -> (a!='y')
			return expr_alloc_comp(E_UNEQUAL, sym1, &symbol_yes);
		}
	}
	if (sym1->type == S_BOOLEAN && sym1 == sym2) {
		if ((e1->type == E_NOT && e1->left.expr->type == E_SYMBOL && e2->type == E_SYMBOL) ||
		    (e2->type == E_NOT && e2->left.expr->type == E_SYMBOL && e1->type == E_SYMBOL))
			return expr_alloc_symbol(&symbol_yes);
	}

	if (DEBUG_EXPR) {
		printf("optimize (");
		expr_fprint(e1, stdout);
		printf(") || (");
		expr_fprint(e2, stdout);
		printf(")?\n");
	}
	return NULL;
}

struct expr *expr_join_and(struct expr *e1, struct expr *e2)
{
	struct expr *tmp;
	struct symbol *sym1, *sym2;

	if (expr_eq(e1, e2))
		return expr_copy(e1);
	if (e1->type != E_EQUAL && e1->type != E_UNEQUAL && e1->type != E_SYMBOL && e1->type != E_NOT)
		return NULL;
	if (e2->type != E_EQUAL && e2->type != E_UNEQUAL && e2->type != E_SYMBOL && e2->type != E_NOT)
		return NULL;
	if (e1->type == E_NOT) {
		tmp = e1->left.expr;
		if (tmp->type != E_EQUAL && tmp->type != E_UNEQUAL && tmp->type != E_SYMBOL)
			return NULL;
		sym1 = tmp->left.sym;
	} else
		sym1 = e1->left.sym;
	if (e2->type == E_NOT) {
		if (e2->left.expr->type != E_SYMBOL)
			return NULL;
		sym2 = e2->left.expr->left.sym;
	} else
		sym2 = e2->left.sym;
	if (sym1 != sym2)
		return NULL;
	if (sym1->type != S_BOOLEAN && sym1->type != S_TRISTATE)
		return NULL;

	if ((e1->type == E_SYMBOL && e2->type == E_EQUAL && e2->right.sym == &symbol_yes) ||
	    (e2->type == E_SYMBOL && e1->type == E_EQUAL && e1->right.sym == &symbol_yes))
		// (a) && (a='y') -> (a='y')
		return expr_alloc_comp(E_EQUAL, sym1, &symbol_yes);

	if ((e1->type == E_SYMBOL && e2->type == E_UNEQUAL && e2->right.sym == &symbol_no) ||
	    (e2->type == E_SYMBOL && e1->type == E_UNEQUAL && e1->right.sym == &symbol_no))
		// (a) && (a!='n') -> (a)
		return expr_alloc_symbol(sym1);

	if ((e1->type == E_SYMBOL && e2->type == E_UNEQUAL && e2->right.sym == &symbol_mod) ||
	    (e2->type == E_SYMBOL && e1->type == E_UNEQUAL && e1->right.sym == &symbol_mod))
		// (a) && (a!='m') -> (a='y')
		return expr_alloc_comp(E_EQUAL, sym1, &symbol_yes);

	if (sym1->type == S_TRISTATE) {
		if (e1->type == E_EQUAL && e2->type == E_UNEQUAL) {
			// (a='b') && (a!='c') -> 'b'='c' ? 'n' : a='b'
			sym2 = e1->right.sym;
			if ((e2->right.sym->flags & SYMBOL_CONST) && (sym2->flags & SYMBOL_CONST))
				return sym2 != e2->right.sym ? expr_alloc_comp(E_EQUAL, sym1, sym2)
							     : expr_alloc_symbol(&symbol_no);
		}
		if (e1->type == E_UNEQUAL && e2->type == E_EQUAL) {
			// (a='b') && (a!='c') -> 'b'='c' ? 'n' : a='b'
			sym2 = e2->right.sym;
			if ((e1->right.sym->flags & SYMBOL_CONST) && (sym2->flags & SYMBOL_CONST))
				return sym2 != e1->right.sym ? expr_alloc_comp(E_EQUAL, sym1, sym2)
							     : expr_alloc_symbol(&symbol_no);
		}
		if (e1->type == E_UNEQUAL && e2->type == E_UNEQUAL &&
			   ((e1->right.sym == &symbol_yes && e2->right.sym == &symbol_no) ||
			    (e1->right.sym == &symbol_no && e2->right.sym == &symbol_yes)))
			// (a!='y') && (a!='n') -> (a='m')
			return expr_alloc_comp(E_EQUAL, sym1, &symbol_mod);

		if (e1->type == E_UNEQUAL && e2->type == E_UNEQUAL &&
			   ((e1->right.sym == &symbol_yes && e2->right.sym == &symbol_mod) ||
			    (e1->right.sym == &symbol_mod && e2->right.sym == &symbol_yes)))
			// (a!='y') && (a!='m') -> (a='n')
			return expr_alloc_comp(E_EQUAL, sym1, &symbol_no);

		if (e1->type == E_UNEQUAL && e2->type == E_UNEQUAL &&
			   ((e1->right.sym == &symbol_mod && e2->right.sym == &symbol_no) ||
			    (e1->right.sym == &symbol_no && e2->right.sym == &symbol_mod)))
			// (a!='m') && (a!='n') -> (a='m')
			return expr_alloc_comp(E_EQUAL, sym1, &symbol_yes);

		if ((e1->type == E_SYMBOL && e2->type == E_EQUAL && e2->right.sym == &symbol_mod) ||
		    (e2->type == E_SYMBOL && e1->type == E_EQUAL && e1->right.sym == &symbol_mod) ||
		    (e1->type == E_SYMBOL && e2->type == E_UNEQUAL && e2->right.sym == &symbol_yes) ||
		    (e2->type == E_SYMBOL && e1->type == E_UNEQUAL && e1->right.sym == &symbol_yes))
			return NULL;
	}

	if (DEBUG_EXPR) {
		printf("optimize (");
		expr_fprint(e1, stdout);
		printf(") && (");
		expr_fprint(e2, stdout);
		printf(")?\n");
	}
	return NULL;
}

static void expr_eliminate_dups1(enum expr_type type, struct expr **ep1, struct expr **ep2)
{
#define e1 (*ep1)
#define e2 (*ep2)
	struct expr *tmp;

	if (e1->type == type) {
		expr_eliminate_dups1(type, &e1->left.expr, &e2);
		expr_eliminate_dups1(type, &e1->right.expr, &e2);
		return;
	}
	if (e2->type == type) {
		expr_eliminate_dups1(type, &e1, &e2->left.expr);
		expr_eliminate_dups1(type, &e1, &e2->right.expr);
		return;
	}
	if (e1 == e2)
		return;

	switch (e1->type) {
	case E_OR: case E_AND:
		expr_eliminate_dups1(e1->type, &e1, &e1);
	default:
		;
	}

	switch (type) {
	case E_OR:
		tmp = expr_join_or(e1, e2);
		if (tmp) {
			expr_free(e1); expr_free(e2);
			e1 = expr_alloc_symbol(&symbol_no);
			e2 = tmp;
			trans_count++;
		}
		break;
	case E_AND:
		tmp = expr_join_and(e1, e2);
		if (tmp) {
			expr_free(e1); expr_free(e2);
			e1 = expr_alloc_symbol(&symbol_yes);
			e2 = tmp;
			trans_count++;
		}
		break;
	default:
		;
	}
#undef e1
#undef e2
}

static void expr_eliminate_dups2(enum expr_type type, struct expr **ep1, struct expr **ep2)
{
#define e1 (*ep1)
#define e2 (*ep2)
	struct expr *tmp, *tmp1, *tmp2;

	if (e1->type == type) {
		expr_eliminate_dups2(type, &e1->left.expr, &e2);
		expr_eliminate_dups2(type, &e1->right.expr, &e2);
		return;
	}
	if (e2->type == type) {
		expr_eliminate_dups2(type, &e1, &e2->left.expr);
		expr_eliminate_dups2(type, &e1, &e2->right.expr);
	}
	if (e1 == e2)
		return;

	switch (e1->type) {
	case E_OR:
		expr_eliminate_dups2(e1->type, &e1, &e1);
		// (FOO || BAR) && (!FOO && !BAR) -> n
		tmp1 = expr_transform(expr_alloc_one(E_NOT, expr_copy(e1)));
		tmp2 = expr_copy(e2);
		tmp = expr_extract_eq_and(&tmp1, &tmp2);
		if (expr_is_yes(tmp1)) {
			expr_free(e1);
			e1 = expr_alloc_symbol(&symbol_no);
			trans_count++;
		}
		expr_free(tmp2);
		expr_free(tmp1);
		expr_free(tmp);
		break;
	case E_AND:
		expr_eliminate_dups2(e1->type, &e1, &e1);
		// (FOO && BAR) || (!FOO || !BAR) -> y
		tmp1 = expr_transform(expr_alloc_one(E_NOT, expr_copy(e1)));
		tmp2 = expr_copy(e2);
		tmp = expr_extract_eq_or(&tmp1, &tmp2);
		if (expr_is_no(tmp1)) {
			expr_free(e1);
			e1 = expr_alloc_symbol(&symbol_yes);
			trans_count++;
		}
		expr_free(tmp2);
		expr_free(tmp1);
		expr_free(tmp);
		break;
	default:
		;
	}
#undef e1
#undef e2
}

struct expr *expr_eliminate_dups(struct expr *e)
{
	int oldcount;
	if (!e)
		return e;

	oldcount = trans_count;
	while (1) {
		trans_count = 0;
		switch (e->type) {
		case E_OR: case E_AND:
			expr_eliminate_dups1(e->type, &e, &e);
			expr_eliminate_dups2(e->type, &e, &e);
		default:
			;
		}
		if (!trans_count)
			break;
		e = expr_eliminate_yn(e);
	}
	trans_count = oldcount;
	return e;
}

struct expr *expr_transform(struct expr *e)
{
	struct expr *tmp;

	if (!e)
		return NULL;
	switch (e->type) {
	case E_EQUAL:
	case E_UNEQUAL:
	case E_SYMBOL:
	case E_CHOICE:
		break;
	default:
		e->left.expr = expr_transform(e->left.expr);
		e->right.expr = expr_transform(e->right.expr);
	}

	switch (e->type) {
	case E_EQUAL:
		if (e->left.sym->type != S_BOOLEAN)
			break;
		if (e->right.sym == &symbol_no) {
			e->type = E_NOT;
			e->left.expr = expr_alloc_symbol(e->left.sym);
			e->right.sym = NULL;
			break;
		}
		if (e->right.sym == &symbol_mod) {
			printf("boolean symbol %s tested for 'm'? test forced to 'n'\n", e->left.sym->name);
			e->type = E_SYMBOL;
			e->left.sym = &symbol_no;
			e->right.sym = NULL;
			break;
		}
		if (e->right.sym == &symbol_yes) {
			e->type = E_SYMBOL;
			e->right.sym = NULL;
			break;
		}
		break;
	case E_UNEQUAL:
		if (e->left.sym->type != S_BOOLEAN)
			break;
		if (e->right.sym == &symbol_no) {
			e->type = E_SYMBOL;
			e->right.sym = NULL;
			break;
		}
		if (e->right.sym == &symbol_mod) {
			printf("boolean symbol %s tested for 'm'? test forced to 'y'\n", e->left.sym->name);
			e->type = E_SYMBOL;
			e->left.sym = &symbol_yes;
			e->right.sym = NULL;
			break;
		}
		if (e->right.sym == &symbol_yes) {
			e->type = E_NOT;
			e->left.expr = expr_alloc_symbol(e->left.sym);
			e->right.sym = NULL;
			break;
		}
		break;
	case E_NOT:
		switch (e->left.expr->type) {
		case E_NOT:
			// !!a -> a
			tmp = e->left.expr->left.expr;
			free(e->left.expr);
			free(e);
			e = tmp;
			e = expr_transform(e);
			break;
		case E_EQUAL:
		case E_UNEQUAL:
			// !a='x' -> a!='x'
			tmp = e->left.expr;
			free(e);
			e = tmp;
			e->type = e->type == E_EQUAL ? E_UNEQUAL : E_EQUAL;
			break;
		case E_OR:
			// !(a || b) -> !a && !b
			tmp = e->left.expr;
			e->type = E_AND;
			e->right.expr = expr_alloc_one(E_NOT, tmp->right.expr);
			tmp->type = E_NOT;
			tmp->right.expr = NULL;
			e = expr_transform(e);
			break;
		case E_AND:
			// !(a && b) -> !a || !b
			tmp = e->left.expr;
			e->type = E_OR;
			e->right.expr = expr_alloc_one(E_NOT, tmp->right.expr);
			tmp->type = E_NOT;
			tmp->right.expr = NULL;
			e = expr_transform(e);
			break;
		case E_SYMBOL:
			if (e->left.expr->left.sym == &symbol_yes) {
				// !'y' -> 'n'
				tmp = e->left.expr;
				free(e);
				e = tmp;
				e->type = E_SYMBOL;
				e->left.sym = &symbol_no;
				break;
			}
			if (e->left.expr->left.sym == &symbol_mod) {
				// !'m' -> 'm'
				tmp = e->left.expr;
				free(e);
				e = tmp;
				e->type = E_SYMBOL;
				e->left.sym = &symbol_mod;
				break;
			}
			if (e->left.expr->left.sym == &symbol_no) {
				// !'n' -> 'y'
				tmp = e->left.expr;
				free(e);
				e = tmp;
				e->type = E_SYMBOL;
				e->left.sym = &symbol_yes;
				break;
			}
			break;
		default:
			;
		}
		break;
	default:
		;
	}
	return e;
}

int expr_contains_symbol(struct expr *dep, struct symbol *sym)
{
	if (!dep)
		return 0;

	switch (dep->type) {
	case E_AND:
	case E_OR:
		return expr_contains_symbol(dep->left.expr, sym) ||
		       expr_contains_symbol(dep->right.expr, sym);
	case E_SYMBOL:
		return dep->left.sym == sym;
	case E_EQUAL:
	case E_UNEQUAL:
		return dep->left.sym == sym ||
		       dep->right.sym == sym;
	case E_NOT:
		return expr_contains_symbol(dep->left.expr, sym);
	default:
		;
	}
	return 0;
}

bool expr_depends_symbol(struct expr *dep, struct symbol *sym)
{
	if (!dep)
		return false;

	switch (dep->type) {
	case E_AND:
		return expr_depends_symbol(dep->left.expr, sym) ||
		       expr_depends_symbol(dep->right.expr, sym);
	case E_SYMBOL:
		return dep->left.sym == sym;
	case E_EQUAL:
		if (dep->left.sym == sym) {
			if (dep->right.sym == &symbol_yes || dep->right.sym == &symbol_mod)
				return true;
		}
		break;
	case E_UNEQUAL:
		if (dep->left.sym == sym) {
			if (dep->right.sym == &symbol_no)
				return true;
		}
		break;
	default:
		;
	}
 	return false;
}

struct expr *expr_extract_eq_and(struct expr **ep1, struct expr **ep2)
{
	struct expr *tmp = NULL;
	expr_extract_eq(E_AND, &tmp, ep1, ep2);
	if (tmp) {
		*ep1 = expr_eliminate_yn(*ep1);
		*ep2 = expr_eliminate_yn(*ep2);
	}
	return tmp;
}

struct expr *expr_extract_eq_or(struct expr **ep1, struct expr **ep2)
{
	struct expr *tmp = NULL;
	expr_extract_eq(E_OR, &tmp, ep1, ep2);
	if (tmp) {
		*ep1 = expr_eliminate_yn(*ep1);
		*ep2 = expr_eliminate_yn(*ep2);
	}
	return tmp;
}

void expr_extract_eq(enum expr_type type, struct expr **ep, struct expr **ep1, struct expr **ep2)
{
#define e1 (*ep1)
#define e2 (*ep2)
	if (e1->type == type) {
		expr_extract_eq(type, ep, &e1->left.expr, &e2);
		expr_extract_eq(type, ep, &e1->right.expr, &e2);
		return;
	}
	if (e2->type == type) {
		expr_extract_eq(type, ep, ep1, &e2->left.expr);
		expr_extract_eq(type, ep, ep1, &e2->right.expr);
		return;
	}
	if (expr_eq(e1, e2)) {
		*ep = *ep ? expr_alloc_two(type, *ep, e1) : e1;
		expr_free(e2);
		if (type == E_AND) {
			e1 = expr_alloc_symbol(&symbol_yes);
			e2 = expr_alloc_symbol(&symbol_yes);
		} else if (type == E_OR) {
			e1 = expr_alloc_symbol(&symbol_no);
			e2 = expr_alloc_symbol(&symbol_no);
		}
	}
#undef e1
#undef e2
}

struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symbol *sym)
{
	struct expr *e1, *e2;

	if (!e) {
		e = expr_alloc_symbol(sym);
		if (type == E_UNEQUAL)
			e = expr_alloc_one(E_NOT, e);
		return e;
	}
	switch (e->type) {
	case E_AND:
		e1 = expr_trans_compare(e->left.expr, E_EQUAL, sym);
		e2 = expr_trans_compare(e->right.expr, E_EQUAL, sym);
		if (sym == &symbol_yes)
			e = expr_alloc_two(E_AND, e1, e2);
		if (sym == &symbol_no)
			e = expr_alloc_two(E_OR, e1, e2);
		if (type == E_UNEQUAL)
			e = expr_alloc_one(E_NOT, e);
		return e;
	case E_OR:
		e1 = expr_trans_compare(e->left.expr, E_EQUAL, sym);
		e2 = expr_trans_compare(e->right.expr, E_EQUAL, sym);
		if (sym == &symbol_yes)
			e = expr_alloc_two(E_OR, e1, e2);
		if (sym == &symbol_no)
			e = expr_alloc_two(E_AND, e1, e2);
		if (type == E_UNEQUAL)
			e = expr_alloc_one(E_NOT, e);
		return e;
	case E_NOT:
		return expr_trans_compare(e->left.expr, type == E_EQUAL ? E_UNEQUAL : E_EQUAL, sym);
	case E_UNEQUAL:
	case E_EQUAL:
		if (type == E_EQUAL) {
			if (sym == &symbol_yes)
				return expr_copy(e);
			if (sym == &symbol_mod)
				return expr_alloc_symbol(&symbol_no);
			if (sym == &symbol_no)
				return expr_alloc_one(E_NOT, expr_copy(e));
		} else {
			if (sym == &symbol_yes)
				return expr_alloc_one(E_NOT, expr_copy(e));
			if (sym == &symbol_mod)
				return expr_alloc_symbol(&symbol_yes);
			if (sym == &symbol_no)
				return expr_copy(e);
		}
		break;
	case E_SYMBOL:
		return expr_alloc_comp(type, e->left.sym, sym);
	case E_CHOICE:
	case E_RANGE:
	case E_NONE:
		/* panic */;
	}
	return NULL;
}

tristate expr_calc_value(struct expr *e)
{
	tristate val1, val2;
	const char *str1, *str2;

	if (!e)
		return yes;

	switch (e->type) {
	case E_SYMBOL:
		sym_calc_value(e->left.sym);
		return e->left.sym->curr.tri;
	case E_AND:
		val1 = expr_calc_value(e->left.expr);
		val2 = expr_calc_value(e->right.expr);
		return E_AND(val1, val2);
	case E_OR:
		val1 = expr_calc_value(e->left.expr);
		val2 = expr_calc_value(e->right.expr);
		return E_OR(val1, val2);
	case E_NOT:
		val1 = expr_calc_value(e->left.expr);
		return E_NOT(val1);
	case E_EQUAL:
		sym_calc_value(e->left.sym);
		sym_calc_value(e->right.sym);
		str1 = sym_get_string_value(e->left.sym);
		str2 = sym_get_string_value(e->right.sym);
		return !strcmp(str1, str2) ? yes : no;
	case E_UNEQUAL:
		sym_calc_value(e->left.sym);
		sym_calc_value(e->right.sym);
		str1 = sym_get_string_value(e->left.sym);
		str2 = sym_get_string_value(e->right.sym);
		return !strcmp(str1, str2) ? no : yes;
	default:
		printf("expr_calc_value: %d?\n", e->type);
		return no;
	}
}

int expr_compare_type(enum expr_type t1, enum expr_type t2)
{
#if 0
	return 1;
#else
	if (t1 == t2)
		return 0;
	switch (t1) {
	case E_EQUAL:
	case E_UNEQUAL:
		if (t2 == E_NOT)
			return 1;
	case E_NOT:
		if (t2 == E_AND)
			return 1;
	case E_AND:
		if (t2 == E_OR)
			return 1;
	case E_OR:
		if (t2 == E_CHOICE)
			return 1;
	case E_CHOICE:
		if (t2 == 0)
			return 1;
	default:
		return -1;
	}
	printf("[%dgt%d?]", t1, t2);
	return 0;
#endif
}

void expr_print(struct expr *e, void (*fn)(void *, const char *), void *data, int prevtoken)
{
	if (!e) {
		fn(data, "y");
		return;
	}

	if (expr_compare_type(prevtoken, e->type) > 0)
		fn(data, "(");
	switch (e->type) {
	case E_SYMBOL:
		if (e->left.sym->name)
			fn(data, e->left.sym->name);
		else
			fn(data, "<choice>");
		break;
	case E_NOT:
		fn(data, "!");
		expr_print(e->left.expr, fn, data, E_NOT);
		break;
	case E_EQUAL:
		fn(data, e->left.sym->name);
		fn(data, "=");
		fn(data, e->right.sym->name);
		break;
	case E_UNEQUAL:
		fn(data, e->left.sym->name);
		fn(data, "!=");
		fn(data, e->right.sym->name);
		break;
	case E_OR:
		expr_print(e->left.expr, fn, data, E_OR);
		fn(data, " || ");
		expr_print(e->right.expr, fn, data, E_OR);
		break;
	case E_AND:
		expr_print(e->left.expr, fn, data, E_AND);
		fn(data, " && ");
		expr_print(e->right.expr, fn, data, E_AND);
		break;
	case E_CHOICE:
		fn(data, e->right.sym->name);
		if (e->left.expr) {
			fn(data, " ^ ");
			expr_print(e->left.expr, fn, data, E_CHOICE);
		}
		break;
	case E_RANGE:
		fn(data, "[");
		fn(data, e->left.sym->name);
		fn(data, " ");
		fn(data, e->right.sym->name);
		fn(data, "]");
		break;
	default:
	  {
		char buf[32];
		sprintf(buf, "<unknown type %d>", e->type);
		fn(data, buf);
		break;
	  }
	}
	if (expr_compare_type(prevtoken, e->type) > 0)
		fn(data, ")");
}

static void expr_print_file_helper(void *data, const char *str)
{
	fwrite(str, strlen(str), 1, data);
}

void expr_fprint(struct expr *e, FILE *out)
{
	expr_print(e, expr_print_file_helper, out, E_NONE);
}

static void expr_print_gstr_helper(void *data, const char *str)
{
	str_append((struct gstr*)data, str);
}

void expr_gstr_print(struct expr *e, struct gstr *gs)
{
	expr_print(e, expr_print_gstr_helper, gs, E_NONE);
}
generated by cgit v1.2.3 (git 2.25.1) at 2026-02-19 03:33:36 +0000