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#include <stdlib.h>
#include <assert.h>
#include "ir.h"
struct ir* ir_make(void) {
struct ir *ir = malloc(sizeof(struct ir));
ir->cap = 32;
ir->len = 0;
ir->inss = malloc(ir->cap * sizeof(struct irins*));
ir->globspace = 0;
return ir;
}
void ir_delete(struct ir *ir) {
for (int i = 0; i < ir->len; i++) {
irins_delete(ir->inss[i]);
}
free(ir->inss);
free(ir);
}
void ir_print(struct ir *ir, FILE *f) {
fprintf(f, "IR [globspace=%d]\n", ir->globspace);
for (int i = 0; i < ir->len; i++) {
irins_print(ir->inss[i], f);
}
}
static const char* condcode_show(enum condcode condcode) {
switch (condcode) {
case CCZ: return "z";
case CCNZ: return "nz";
case CCL: return "l";
case CCG: return "g";
case CCLE: return "le";
case CCGE: return "ge";
default: assert(false);
}
}
static const char* ref_show(struct ref ref) {
static char cbuf[3][16];
static int cbufi = 0;
static const char *special[8] = {"A", "B", "C", "D", "X", "Y", "SP", "BP"};
const char *suffix;
if (ref.rel == REFREL_ZERO) suffix = "";
else if (ref.rel == REFREL_DATA) suffix = ":data";
else if (ref.rel == REFREL_HEAP) suffix = ":heap";
else assert(false);
switch (ref.type) {
case REF_REG:
if (ref.reg == REG_UNUSED) return "<<UNUSED?>>";
if (ref.reg < 0) return special[-(ref.reg - REG_A)];
cbufi = (cbufi + 1) % 3;
sprintf(cbuf[cbufi], "t%d", ref.reg);
return cbuf[cbufi];
case REF_MEM:
cbufi = (cbufi + 1) % 3;
if (ref.reg == REG_UNUSED) {
sprintf(cbuf[cbufi], "[%d%s]", ref.offset, suffix);
} else if (ref.reg < 0) {
sprintf(cbuf[cbufi], "[%s + %d%s]", special[-(ref.reg - REG_A)], ref.offset, suffix);
} else {
sprintf(cbuf[cbufi], "[t%d + %d%s]", ref.reg, ref.offset, suffix);
}
return cbuf[cbufi];
case REF_IMM:
cbufi = (cbufi + 1) % 3;
sprintf(cbuf[cbufi], "%d", ref.imm);
return cbuf[cbufi];
default:
assert(false);
}
}
void irins_print(struct irins *ins, FILE *f) {
switch (ins->type) {
case INS_ADD: fprintf(f, "\t%s <- %s + %s\n", ref_show(ins->r0), ref_show(ins->r1), ref_show(ins->r2)); break;
case INS_SUB: fprintf(f, "\t%s <- %s - %s\n", ref_show(ins->r0), ref_show(ins->r1), ref_show(ins->r2)); break;
case INS_MUL: fprintf(f, "\t%s <- %s * %s\n", ref_show(ins->r0), ref_show(ins->r1), ref_show(ins->r2)); break;
case INS_DIV: fprintf(f, "\t%s <- %s / %s\n", ref_show(ins->r0), ref_show(ins->r1), ref_show(ins->r2)); break;
case INS_MOD: fprintf(f, "\t%s <- %s %% %s\n", ref_show(ins->r0), ref_show(ins->r1), ref_show(ins->r2)); break;
case INS_NEG: fprintf(f, "\t%s <- -%s\n", ref_show(ins->r0), ref_show(ins->r1)); break;
case INS_NOT: fprintf(f, "\t%s <- !%s\n", ref_show(ins->r0), ref_show(ins->r1)); break;
case INS_TEST: fprintf(f, "\ttest %s, %s\n", ref_show(ins->r1), ref_show(ins->r2)); break;
case INS_PUSH: fprintf(f, "\tpush %s\n", ref_show(ins->r1)); break;
case INS_POP: fprintf(f, "\t%s = pop\n", ref_show(ins->r0)); break;
case INS_CMP: fprintf(f, "\tcmp %s, %s\n", ref_show(ins->r1), ref_show(ins->r2)); break;
case INS_LBL: fprintf(f, "%s:\n", ins->name); break;
case INS_JMP: fprintf(f, "\tjmp %s\n", ins->name); break;
case INS_JCC: fprintf(f, "\tj%s %s\n", condcode_show(ins->condcode), ins->name); break;
case INS_CALL: fprintf(f, "\tcall %s\n", ins->name); break;
case INS_CALLV: fprintf(f, "\t%s <- call %s\n", ref_show(ins->r0), ins->name); break;
case INS_RET: fprintf(f, "\tret\n"); break;
case INS_RETV: fprintf(f, "\tret %s\n", ref_show(ins->r1)); break;
case INS_MOV: fprintf(f, "\t%s <- %s\n", ref_show(ins->r0), ref_show(ins->r1)); break;
default: assert(false);
}
}
struct ref ir_reserve_global(struct ir *ir, int size) {
int offset = ir->globspace;
ir->globspace += size;
return ref_mem(REG_UNUSED, offset, REFREL_DATA);
}
void ir_append(struct ir *ir, struct irins *ins) {
if (ir->len == ir->cap) {
ir->cap *= 2;
ir->inss = realloc(ir->inss, ir->cap * sizeof(struct irins*));
}
ir->inss[ir->len++] = ins;
}
struct irins* irins_make(enum instype type) {
struct irins *ins = malloc(sizeof(struct irins));
ins->type = type;
ins->name = NULL;
return ins;
}
struct irins* irins_make_name(enum instype type, char *name) {
struct irins *ins = irins_make(type);
ins->name = name;
return ins;
}
struct irins* irins_make_0(enum instype type, struct ref r0) {
struct irins *ins = irins_make(type);
ins->r0 = r0;
return ins;
}
struct irins* irins_make_01(enum instype type, struct ref r0, struct ref r1) {
struct irins *ins = irins_make(type);
ins->r0 = r0;
ins->r1 = r1;
return ins;
}
struct irins* irins_make_012(enum instype type, struct ref r0, struct ref r1, struct ref r2) {
struct irins *ins = irins_make_01(type, r0, r1);
ins->r2 = r2;
return ins;
}
struct irins* irins_make_1(enum instype type, struct ref r1) {
struct irins *ins = irins_make(type);
ins->r1 = r1;
return ins;
}
struct irins* irins_make_12(enum instype type, struct ref r1, struct ref r2) {
struct irins *ins = irins_make(type);
ins->r1 = r1;
ins->r2 = r2;
return ins;
}
struct irins* irins_make_jcc(char *name, enum condcode condcode) {
struct irins *ins = irins_make(INS_JCC);
ins->name = name;
ins->condcode = condcode;
return ins;
}
void irins_delete(struct irins *ins) {
if (ins->name) free(ins->name);
free(ins);
}
char* gen_label_name(void) {
static int next = 0;
char *buf = malloc(16);
sprintf(buf, "L%d", next++);
return buf;
}
struct ref ref_reg(int reg) {
return (struct ref){REF_REG, reg, 0, REFREL_ZERO, 0};
}
struct ref ref_mem(int reg, int offset, enum refrel rel) {
return (struct ref){REF_MEM, reg, offset, rel, 0};
}
struct ref ref_imm(int imm) {
return (struct ref){REF_IMM, REG_UNUSED, 0, REFREL_ZERO, imm};
}
struct ref ref_next_register(void) {
static int next = 0;
return ref_reg(next++);
}
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