854 lines
20 KiB
C
854 lines
20 KiB
C
#include "mcg.h"
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static struct basicblock* current_bb;
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static int stackptr;
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static struct ir* stack[64];
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static struct ir* convert(struct ir* src, int destsize, int opcodebase);
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static struct ir* appendir(struct ir* ir);
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static void reset_stack(void)
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{
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stackptr = 0;
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}
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static void push(struct ir* ir)
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{
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if (stackptr == sizeof(stack)/sizeof(*stack))
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fatal("stack overflow");
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/* If we try to push something which is too small, convert it to a word
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* first. */
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if (ir->size < EM_wordsize)
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ir = convert(ir, EM_wordsize, IR_CIU1);
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stack[stackptr++] = ir;
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}
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static struct ir* pop(int size)
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{
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if (stackptr == 0)
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{
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/* Nothing in our fake stack, so we have to read from the real stack. */
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if (size < EM_wordsize)
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size = EM_wordsize;
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return
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appendir(
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new_ir0(
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IR_POP, size
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)
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);
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}
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else
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{
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struct ir* ir = stack[--stackptr];
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/* If we try to pop something which is smaller than a word, convert it first. */
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if (size < EM_wordsize)
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ir = convert(ir, size, IR_CIU1);
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if (ir->size != size)
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fatal("expected an item on stack of size %d, but got %d\n", size, ir->size);
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return ir;
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}
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}
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static void print_stack(void)
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{
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int i;
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tracef('E', "E: stack:");
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for (i=0; i<stackptr; i++)
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{
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struct ir* ir = stack[i];
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tracef('E', " $%d.%d", ir->id, ir->size);
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}
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tracef('E', " (top)\n");
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}
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static struct ir* appendir(struct ir* ir)
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{
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int i;
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assert(current_bb != NULL);
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array_appendu(¤t_bb->irs, ir);
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ir_print('0', ir);
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return ir;
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}
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static void materialise_stack(void)
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{
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int i;
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for (i=0; i<stackptr; i++)
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{
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struct ir* ir = stack[i];
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appendir(
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new_ir1(
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IR_PUSH, ir->size,
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ir
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)
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);
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}
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reset_stack();
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}
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void tb_filestart(void)
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{
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}
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void tb_fileend(void)
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{
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}
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void tb_regvar(struct procedure* procedure, arith offset, int size, int type, int priority)
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{
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struct local* local = calloc(1, sizeof(*local));
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local->size = size;
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local->offset = offset;
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local->is_register = true;
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imap_put(&procedure->locals, offset, local);
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}
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static struct ir* address_of_external(const char* label, arith offset)
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{
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if (offset != 0)
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return
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new_ir2(
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IR_ADD, EM_pointersize,
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new_labelir(label),
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new_wordir(offset)
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);
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else
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return
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new_labelir(label);
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}
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static struct ir* convert(struct ir* src, int destsize, int opcode)
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{
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switch (src->size)
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{
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case 1: opcode += 0; break;
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case 2: opcode += 1; break;
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case 4: opcode += 2; break;
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case 8: opcode += 3; break;
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default:
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fatal("can't convert from things of size %d", src->size);
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}
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return
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new_ir1(
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opcode, destsize,
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src
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);
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}
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static struct ir* tristate_compare(int size, int opcode)
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{
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struct ir* right = pop(size);
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struct ir* left = pop(size);
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return
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new_ir2(
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opcode, EM_wordsize,
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left, right
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);
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}
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static void simple_convert(int opcode)
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{
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struct ir* destsize = pop(EM_wordsize);
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struct ir* srcsize = pop(EM_wordsize);
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struct ir* value;
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assert(srcsize->opcode == IR_CONST);
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assert(destsize->opcode == IR_CONST);
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value = pop(srcsize->u.ivalue);
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push(
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convert(value, destsize->u.ivalue, opcode)
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);
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}
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static void insn_simple(int opcode)
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{
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switch (opcode)
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{
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case op_bra:
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{
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struct ir* dest = pop(EM_pointersize);
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materialise_stack();
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appendir(
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new_ir1(
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IR_JUMP, 0,
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dest
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)
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);
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break;
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}
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case op_cii: simple_convert(IR_CII1); break;
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case op_ciu: simple_convert(IR_CIU1); break;
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case op_cui: simple_convert(IR_CUI1); break;
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case op_cmp:
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push(
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tristate_compare(EM_pointersize, IR_COMPAREU)
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);
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break;
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case op_cai:
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{
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struct ir* dest = pop(EM_pointersize);
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materialise_stack();
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appendir(
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new_ir1(
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IR_CALL, 0,
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dest
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)
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);
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break;
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}
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case op_inc:
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{
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push(
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new_ir2(
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IR_ADD, EM_wordsize,
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pop(EM_wordsize),
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new_wordir(1)
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)
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);
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break;
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}
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case op_dec:
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{
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push(
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new_ir2(
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IR_SUB, EM_wordsize,
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pop(EM_wordsize),
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new_wordir(1)
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)
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);
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break;
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}
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default:
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fatal("treebuilder: unknown simple instruction '%s'",
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em_mnem[opcode - sp_fmnem]);
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}
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}
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static void simple_branch2(int opcode, int size,
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struct basicblock* truebb, struct basicblock* falsebb,
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int irop)
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{
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struct ir* right = pop(size);
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struct ir* left = pop(size);
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materialise_stack();
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appendir(
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new_ir2(
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irop, 0,
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new_ir2(
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IR_COMPARES, size,
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left, right
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),
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new_ir2(
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IR_PAIR, 0,
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new_bbir(truebb),
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new_bbir(falsebb)
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)
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)
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);
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}
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static void compare0_branch2(int opcode,
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struct basicblock* truebb, struct basicblock* falsebb,
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int irop)
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{
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push(
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new_wordir(0)
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);
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simple_branch2(opcode, EM_wordsize, truebb, falsebb, irop);
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}
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static void insn_bvalue(int opcode, struct basicblock* leftbb, struct basicblock* rightbb)
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{
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switch (opcode)
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{
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case op_zeq: compare0_branch2(opcode, leftbb, rightbb, IR_CJUMPEQ); break;
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case op_zlt: compare0_branch2(opcode, leftbb, rightbb, IR_CJUMPLT); break;
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case op_zle: compare0_branch2(opcode, leftbb, rightbb, IR_CJUMPLE); break;
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case op_zne: compare0_branch2(opcode, rightbb, leftbb, IR_CJUMPEQ); break;
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case op_zge: compare0_branch2(opcode, rightbb, leftbb, IR_CJUMPLT); break;
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case op_zgt: compare0_branch2(opcode, rightbb, leftbb, IR_CJUMPLE); break;
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case op_beq: simple_branch2(opcode, EM_wordsize, leftbb, rightbb, IR_CJUMPEQ); break;
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case op_blt: simple_branch2(opcode, EM_wordsize, leftbb, rightbb, IR_CJUMPLT); break;
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case op_ble: simple_branch2(opcode, EM_wordsize, leftbb, rightbb, IR_CJUMPLE); break;
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case op_bne: simple_branch2(opcode, EM_wordsize, rightbb, leftbb, IR_CJUMPEQ); break;
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case op_bge: simple_branch2(opcode, EM_wordsize, rightbb, leftbb, IR_CJUMPLT); break;
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case op_bgt: simple_branch2(opcode, EM_wordsize, rightbb, leftbb, IR_CJUMPLE); break;
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case op_bra:
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{
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materialise_stack();
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appendir(
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new_ir1(
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IR_JUMP, 0,
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new_bbir(leftbb)
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)
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);
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break;
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}
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case op_lae:
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push(
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new_bbir(leftbb)
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);
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break;
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default:
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fatal("treebuilder: unknown bvalue instruction '%s'",
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em_mnem[opcode - sp_fmnem]);
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}
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}
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static void simple_alu1(int opcode, int size, int irop)
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{
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struct ir* val = pop(size);
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push(
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new_ir1(
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irop, size,
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val
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)
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);
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}
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static void simple_alu2(int opcode, int size, int irop)
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{
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struct ir* right = pop(size);
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struct ir* left = pop(size);
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push(
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new_ir2(
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irop, size,
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left, right
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)
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);
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}
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static struct ir* extract_block_refs(struct basicblock* bb)
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{
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struct ir* outir = NULL;
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int i;
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for (i=0; i<bb->ems.count; i++)
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{
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struct em* em = bb->ems.item[i];
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assert(em->opcode == op_bra);
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assert(em->paramtype == PARAM_BVALUE);
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outir = new_ir2(
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IR_PAIR, 0,
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new_bbir(em->u.bvalue.left),
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outir
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);
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}
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return outir;
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}
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static void change_by(struct ir* address, int amount)
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{
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appendir(
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new_ir2(
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IR_STORE, EM_wordsize,
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address,
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new_ir2(
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IR_ADD, EM_wordsize,
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new_ir1(
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IR_LOAD, EM_wordsize,
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address
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),
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new_wordir(amount)
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)
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)
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);
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}
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static void insn_ivalue(int opcode, arith value)
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{
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switch (opcode)
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{
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case op_adi: simple_alu2(opcode, value, IR_ADD); break;
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case op_sbi: simple_alu2(opcode, value, IR_SUB); break;
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case op_mli: simple_alu2(opcode, value, IR_MUL); break;
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case op_dvi: simple_alu2(opcode, value, IR_DIV); break;
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case op_rmi: simple_alu2(opcode, value, IR_MOD); break;
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case op_sli: simple_alu2(opcode, value, IR_ASL); break;
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case op_sri: simple_alu2(opcode, value, IR_ASR); break;
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case op_slu: simple_alu2(opcode, value, IR_LSL); break;
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case op_sru: simple_alu2(opcode, value, IR_LSR); break;
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case op_ngi: simple_alu1(opcode, value, IR_NEG); break;
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case op_adu: simple_alu2(opcode, value, IR_ADD); break;
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case op_sbu: simple_alu2(opcode, value, IR_SUB); break;
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case op_and: simple_alu2(opcode, value, IR_AND); break;
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case op_ior: simple_alu2(opcode, value, IR_OR); break;
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case op_xor: simple_alu2(opcode, value, IR_EOR); break;
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case op_com: simple_alu1(opcode, value, IR_NOT); break;
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case op_adf: simple_alu2(opcode, value, IR_ADDF); break;
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case op_sbf: simple_alu2(opcode, value, IR_SUBF); break;
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case op_mlf: simple_alu2(opcode, value, IR_MULF); break;
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case op_dvf: simple_alu2(opcode, value, IR_DIVF); break;
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case op_ngf: simple_alu1(opcode, value, IR_NEGF); break;
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case op_lol:
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push(
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new_ir1(
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IR_LOAD, EM_wordsize,
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new_localir(value)
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)
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);
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break;
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case op_stl:
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appendir(
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new_ir2(
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IR_STORE, EM_wordsize,
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new_localir(value),
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pop(EM_wordsize)
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)
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);
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break;
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case op_lal:
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push(
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new_localir(value)
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);
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break;
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case op_lil:
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push(
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new_ir1(
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IR_LOAD, EM_wordsize,
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new_ir1(
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IR_LOAD, EM_wordsize,
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new_localir(value)
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)
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)
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);
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break;
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case op_sil:
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appendir(
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new_ir2(
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IR_STORE, EM_wordsize,
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new_ir1(
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IR_LOAD, EM_wordsize,
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new_localir(value)
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),
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pop(EM_wordsize)
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)
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);
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break;
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case op_inl:
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change_by(new_localir(value), 1);
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break;
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case op_del:
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change_by(new_localir(value), -1);
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break;
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case op_zrl:
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appendir(
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new_ir2(
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IR_STORE, EM_wordsize,
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new_localir(value),
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new_wordir(0)
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)
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);
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break;
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case op_loc:
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push(
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new_wordir(value)
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);
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break;
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case op_loi:
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push(
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new_ir1(
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IR_LOAD, value,
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pop(EM_pointersize)
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)
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);
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break;
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case op_lof:
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{
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struct ir* ptr = pop(EM_pointersize);
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push(
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new_ir1(
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IR_LOAD, EM_wordsize,
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new_ir2(
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IR_ADD, EM_pointersize,
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ptr,
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new_wordir(value)
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)
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)
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);
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break;
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}
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case op_sti:
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{
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struct ir* ptr = pop(EM_pointersize);
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struct ir* val = pop(value);
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appendir(
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new_ir2(
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IR_STORE, value,
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ptr, val
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)
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);
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break;
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}
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case op_stf:
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{
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struct ir* ptr = pop(EM_pointersize);
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struct ir* val = pop(value);
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appendir(
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new_ir2(
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IR_STORE, EM_wordsize,
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new_ir2(
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IR_ADD, EM_pointersize,
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ptr,
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new_wordir(value)
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),
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val
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)
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);
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break;
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}
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case op_cmi:
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push(
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tristate_compare(value, IR_COMPARES)
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);
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break;
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case op_cmu:
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push(
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tristate_compare(value, IR_COMPAREU)
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);
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break;
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case op_ads:
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{
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struct ir* off = pop(value);
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struct ir* ptr = pop(EM_pointersize);
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if (value != EM_pointersize)
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off = convert(off, EM_pointersize, IR_CII1);
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push(
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new_ir2(
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IR_ADD, EM_pointersize,
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ptr, off
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)
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);
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break;
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}
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case op_adp:
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{
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struct ir* ptr = pop(EM_pointersize);
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push(
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new_ir2(
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IR_ADD, EM_pointersize,
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ptr,
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new_wordir(value)
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)
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);
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break;
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}
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case op_sbs:
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{
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struct ir* right = pop(EM_pointersize);
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struct ir* left = pop(EM_pointersize);
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struct ir* delta =
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new_ir2(
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|
IR_SUB, EM_pointersize,
|
|
left, right
|
|
);
|
|
|
|
if (value != EM_pointersize)
|
|
delta = convert(delta, value, IR_CII1);
|
|
|
|
push(delta);
|
|
break;
|
|
}
|
|
|
|
case op_dup:
|
|
{
|
|
struct ir* v = pop(value);
|
|
appendir(v);
|
|
push(v);
|
|
push(v);
|
|
break;
|
|
}
|
|
|
|
case op_asp:
|
|
{
|
|
switch (value)
|
|
{
|
|
case 0:
|
|
break;
|
|
|
|
case -1:
|
|
case -2:
|
|
case -4:
|
|
case -8:
|
|
push(new_anyir(-value));
|
|
break;
|
|
|
|
default:
|
|
while ((value > 0) && (stackptr > 0))
|
|
{
|
|
struct ir* ir = pop(stack[stackptr-1]->size);
|
|
value -= ir->size;
|
|
}
|
|
|
|
if (value != 0)
|
|
{
|
|
appendir(
|
|
new_ir1(
|
|
IR_STACKADJUST, EM_pointersize,
|
|
new_wordir(value)
|
|
)
|
|
);
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case op_ret:
|
|
{
|
|
if (value > 0)
|
|
{
|
|
struct ir* retval = pop(value);
|
|
materialise_stack();
|
|
appendir(
|
|
new_ir1(
|
|
IR_SETRET, value,
|
|
retval
|
|
)
|
|
);
|
|
}
|
|
|
|
appendir(
|
|
new_ir0(
|
|
IR_RET, 0
|
|
)
|
|
);
|
|
break;
|
|
}
|
|
|
|
case op_lfr:
|
|
{
|
|
push(
|
|
appendir(
|
|
new_ir0(
|
|
IR_GETRET, value
|
|
)
|
|
)
|
|
);
|
|
break;
|
|
}
|
|
|
|
case op_csa:
|
|
case op_csb:
|
|
{
|
|
const char* helper = aprintf(".%s%d",
|
|
(opcode == op_csa) ? "csa" : "csb",
|
|
value);
|
|
struct ir* descriptor = pop(EM_pointersize);
|
|
|
|
if (descriptor->opcode != IR_LABEL)
|
|
fatal("csa/csb are only supported if they refer "
|
|
"directly to a descriptor block");
|
|
|
|
push(descriptor);
|
|
materialise_stack();
|
|
appendir(
|
|
new_ir2(
|
|
IR_JUMP, 0,
|
|
new_labelir(helper),
|
|
extract_block_refs(bb_get(descriptor->u.lvalue))
|
|
)
|
|
);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
fatal("treebuilder: unknown ivalue instruction '%s'",
|
|
em_mnem[opcode - sp_fmnem]);
|
|
}
|
|
}
|
|
|
|
static void insn_lvalue(int opcode, const char* label, arith offset)
|
|
{
|
|
switch (opcode)
|
|
{
|
|
case op_lae:
|
|
push(
|
|
address_of_external(label, offset)
|
|
);
|
|
break;
|
|
|
|
case op_loe:
|
|
push(
|
|
new_ir1(
|
|
IR_LOAD, EM_wordsize,
|
|
address_of_external(label, offset)
|
|
)
|
|
);
|
|
break;
|
|
|
|
case op_ste:
|
|
appendir(
|
|
new_ir2(
|
|
IR_STORE, EM_wordsize,
|
|
address_of_external(label, offset),
|
|
pop(EM_wordsize)
|
|
)
|
|
);
|
|
break;
|
|
|
|
case op_zre:
|
|
appendir(
|
|
new_ir2(
|
|
IR_STORE, EM_wordsize,
|
|
address_of_external(label, offset),
|
|
new_wordir(0)
|
|
)
|
|
);
|
|
break;
|
|
|
|
case op_cal:
|
|
assert(offset == 0);
|
|
materialise_stack();
|
|
appendir(
|
|
new_ir1(
|
|
IR_CALL, 0,
|
|
new_labelir(label)
|
|
)
|
|
);
|
|
break;
|
|
|
|
case op_bra:
|
|
assert(offset == 0);
|
|
materialise_stack();
|
|
appendir(
|
|
new_ir1(
|
|
IR_JUMP, 0,
|
|
new_labelir(label)
|
|
)
|
|
);
|
|
break;
|
|
|
|
default:
|
|
fatal("treebuilder: unknown lvalue instruction '%s'",
|
|
em_mnem[opcode - sp_fmnem]);
|
|
}
|
|
}
|
|
|
|
static void generate_tree(struct basicblock* bb)
|
|
{
|
|
int i;
|
|
|
|
tracef('0', "0: block %s\n", bb->name);
|
|
|
|
current_bb = bb;
|
|
reset_stack();
|
|
|
|
for (i=0; i<bb->ems.count; i++)
|
|
{
|
|
struct em* em = bb->ems.item[i];
|
|
tracef('E', "E: read %s ", em_mnem[em->opcode - sp_fmnem]);
|
|
switch (em->paramtype)
|
|
{
|
|
case PARAM_NONE:
|
|
tracef('E', "\n");
|
|
insn_simple(em->opcode);
|
|
break;
|
|
|
|
case PARAM_IVALUE:
|
|
tracef('E', "value=%d\n", em->u.ivalue);
|
|
insn_ivalue(em->opcode, em->u.ivalue);
|
|
break;
|
|
|
|
case PARAM_LVALUE:
|
|
tracef('E', "label=%s offset=%d\n",
|
|
em->u.lvalue.label, em->u.lvalue.offset);
|
|
insn_lvalue(em->opcode, em->u.lvalue.label, em->u.lvalue.offset);
|
|
break;
|
|
|
|
case PARAM_BVALUE:
|
|
tracef('E', "true=%s", em->u.bvalue.left->name);
|
|
if (em->u.bvalue.right)
|
|
tracef('E', " false=%s", em->u.bvalue.right->name);
|
|
tracef('E', "\n");
|
|
insn_bvalue(em->opcode, em->u.bvalue.left, em->u.bvalue.right);
|
|
break;
|
|
|
|
default:
|
|
assert(0);
|
|
}
|
|
|
|
if (tracing('E'))
|
|
print_stack();
|
|
}
|
|
|
|
assert(stackptr == 0);
|
|
}
|
|
|
|
void tb_procedure(struct procedure* current_proc)
|
|
{
|
|
int i;
|
|
|
|
for (i=0; i<current_proc->blocks.count; i++)
|
|
generate_tree(current_proc->blocks.item[i]);
|
|
|
|
}
|
|
|
|
/* vim: set sw=4 ts=4 expandtab : */
|
|
|