168 lines
2.5 KiB
C
168 lines
2.5 KiB
C
/* Copyright (c) 2024 Freya Murphy */
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#ifndef __GEN_H__
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#define __GEN_H__
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#include <mlimits.h>
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#include <mips.h>
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#include <stdint.h>
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#include "parse.h"
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#include "tab.h"
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// predefine
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struct generator;
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///
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/// a section
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///
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struct section {
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// name
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struct string name;
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// alignment
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size_t align;
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// data
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char *data;
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size_t len;
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size_t size;
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// permissions
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bool read;
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bool write;
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bool execute;
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/// reference table
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struct reference_table reftab;
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};
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void section_free(struct section *section);
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///
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/// instruction generation state
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///
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struct gen_ins_state {
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// rd,rs,rt
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enum mips32_register rd;
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enum mips32_register rs;
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enum mips32_register rt;
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// fs,ft
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enum mips32_fp_register fs;
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enum mips32_fp_register ft;
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enum mips32_fp_register fd;
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// immd
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uint16_t immd; // 16 bit
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// cc
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uint16_t cc; // 3 bit
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// code
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uint32_t code; // 5 bit
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// pos
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uint32_t pos; // 5 bit
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// size
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uint32_t size; // 5 bit - 1
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// hb
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bool hb; // 1 bit - 1
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// index
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uint32_t index;
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// hint
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uint32_t hint;
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// offset(base)
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uint16_t offset; // 16 bit
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enum mips32_register base;
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// target
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uint32_t target;
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// current referencd label
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struct string *label;
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};
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struct gen_ins_override {
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enum mips32_register reg;
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enum mips32_fp_register fpreg;
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uint32_t immd;
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};
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///
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/// grammer type
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///
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enum grammer_type {
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// registers
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GMR_RD,
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GMR_RS,
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GMR_RT,
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GMR_INDEX_BASE,
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// fp registers
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GMR_FS,
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GMR_FT,
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GMR_FD,
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// numeric fields
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GMR_IMMD,
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GMR_CC,
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GMR_CODE,
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GMR_POS,
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GMR_SIZE,
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GMR_HB,
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GMR_HINT,
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// addresses
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GMR_OFFSET,
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GMR_OFFSET_BASE,
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GMR_TARGET,
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GMR_HI,
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GMR_LO,
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};
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///
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/// generates assembley
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/// from a parser stream
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///
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struct generator {
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struct parser parser;
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// current instruction table
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size_t instructions_len;
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union mips32_instruction *instructions;
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// current grammer table
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size_t grammers_len;
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struct mips32_grammer *grammers;
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// segments
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size_t sections_len;
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size_t sections_size;
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struct section *sections;
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// current section
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struct section *current;
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// symbol table
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struct symbol_table symtab;
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};
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/* generate the input as mips32r6 */
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int generate_mips32r6(struct generator *gen);
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/* run codegen with the mips32r2 specification */
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int generate_mips32r2(struct generator *gen);
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/* run codegen with the mips32r6 specification */
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int generate_mips1(struct generator *gen);
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/* initalize a generator */
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int generator_init(const char *file, struct generator *gen);
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/* free a generator */
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void generator_free(struct generator *gen);
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#endif /* __GEN_H__ */
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