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compile.c
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compile.c
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#include "arena.h"
#include "data_type.h"
#include "imm.h"
#include "operand.h"
#include "std.h"
#include "ast.h"
#include "compile.h"
#include "rhd/linked_list.h"
#include "rhd/hash_map.h"
#include "instruction.h"
#include "token.h"
#include "types.h"
#include "virtual_opcodes.h"
#include "register.h"
#include <stdio.h>
//gcc -w -g test.c compile.c ast.c lex.c parse.c && ./a.out
bool rvalue(compiler_t* ctx, ast_node_t* n, voperand_t* dst);
bool compile_visit_node(compiler_t* ctx, ast_node_t* n);
static size_t get_label(compiler_t *ctx)
{
return ctx->labelindex++;
}
typedef enum
{
EAX,
ECX,
EDX,
EBX,
ESP,
EBP,
ESI,
EDI
} x86_registers;
static void register_name(voperand_t op, vregister_t reg, char* buf, size_t maxlen)
{
if ((op.size == VOPERAND_SIZE_DOUBLE || op.size == VOPERAND_SIZE_FLOAT) && op.type == VOPERAND_REGISTER)
{
snprintf(buf, maxlen, "st%d", reg.index);
return;
}
//NOTE: actual order is eax, ecx, edx...
//but gcc uses edx for some reason over ecx, so i swapped edx and ecx here
static const char* x86_regnames[] = {"eax", "edx", "ecx", "ebx", "esp", "ebp", "esi", "edi", NULL};
static const char* fakeregnames[] = {"sp", "bp", "ip", "return_value"};
if (!op.virtual)
{
snprintf(buf, maxlen, "%s", x86_regnames[reg.index]);
return;
}
if (reg.index < COUNT_OF(fakeregnames))
snprintf(buf, maxlen, "%s", fakeregnames[reg.index]);
else
snprintf(buf, maxlen, "r%d", reg.index);
}
static const char* operand_to_string(voperand_t op)
{
// TODO: FIXME non reentry safe sort of
static char buffers[4][128];
static int bufferindex = 0;
char* buf = &buffers[bufferindex % 4];
char regname[32];
switch (op.type)
{
case VOPERAND_INDIRECT_REGISTER_DISPLACEMENT:
register_name(op, op.reg_indirect_displacement.reg, regname, sizeof(regname));
if(op.reg_indirect_displacement.disp > 0)
{
snprintf(buf, 128, "%s [%s + %d]", voperand_size_names[op.size], regname,
op.reg_indirect_displacement.disp);
}
else
{
snprintf(buf, 128, "%s [%s - %d]", voperand_size_names[op.size], regname,
-op.reg_indirect_displacement.disp);
}
break;
case VOPERAND_LABEL:
snprintf(buf, 128, "<sub_%d>", op.label);
break;
case VOPERAND_REGISTER:
register_name(op, op.reg, regname, sizeof(regname));
snprintf(buf, 128, "%s", regname);
break;
case VOPERAND_INDIRECT_REGISTER:
register_name(op, op.reg, regname, sizeof(regname));
snprintf(buf, 128, "[%s]", regname);
break;
case VOPERAND_IMMEDIATE:
if (op.size == VOPERAND_SIZE_32_BITS)
snprintf(buf, 128, "%d", op.imm.dw);
else if(op.size == VOPERAND_SIZE_DOUBLE)
{
double as_dbl;
memcpy(&as_dbl, &op.imm.dq, sizeof(as_dbl));
snprintf(buf, 128, "%lfd", as_dbl);
}
else if(op.size == VOPERAND_SIZE_FLOAT)
{
double as_flt;
memcpy(&as_flt, &op.imm.dw, sizeof(as_flt));
snprintf(buf, 128, "%ff", as_flt);
}
else
snprintf(buf, 128, "%lld", op.imm.dq);
break;
default:
snprintf(buf, 128, "%s", voperand_type_strings[op.type]);
break;
}
++bufferindex;
return buf;
}
static void print_instruction_operand(voperand_t* vo, bool last)
{
if (vo->type == VOPERAND_INVALID)
printf("invalid");
else
printf("%s%s ", operand_to_string(*vo), last ? "," : "");
}
vregister_t get_vreg(compiler_t *ctx)
{
vregister_t vr;
vr.index = ctx->vregindex++;
/* vr.usage = VRU_GENERAL_PURPOSE; */
return vr;
}
int add_indexed_data(compiler_t *ctx, const void *buffer, size_t len)
{
if(ctx->numindexeddata + 1 >= MAX_INDEXED_DATA)
perror("out of memory for indexed data");
indexed_data_t *id = &ctx->indexed_data[ctx->numindexeddata++];
id->index = ctx->numindexeddata - 1;
id->length = len;
id->buffer = buffer;
return id->index;
}
static vinstr_t *emit_instruction(compiler_t* ctx, vopcode_t op)
{
vinstr_t* instr = &ctx->function->instructions[ctx->function->instruction_index++];
/* instr->index = ctx->function->instruction_index - 1; */
instr->opcode = op;
instr->numoperands = 0;
for (size_t i = 0; i < COUNT_OF(instr->operands); ++i)
instr->operands[0] = invalid_operand();
return instr;
}
static void set_operand(vinstr_t* instr, size_t index, voperand_t op)
{
instr->operands[index] = op;
}
static vinstr_t* emit_instruction1(compiler_t* ctx, vopcode_t opcode, voperand_t a)
{
vinstr_t *instr = emit_instruction(ctx, opcode);
set_operand(instr, 0, a);
instr->numoperands = 1;
return instr;
}
static vopcache_t *find_vopcache_by_key(compiler_t *ctx, voperand_t *key)
{
for(size_t i = 0; i < ctx->function->vopcacheindex; ++i)
{
if(voperand_type_equal(&ctx->function->vopcache[i].key, key))
{
return &ctx->function->vopcache[i];
}
}
return NULL;
}
static vinstr_t* emit_instruction2(compiler_t* ctx, vopcode_t opcode, voperand_t a, voperand_t b)
{
vinstr_t* instr = emit_instruction(ctx, opcode);
set_operand(instr, 0, a);
set_operand(instr, 1, b);
instr->numoperands = 2;
/* if (vopcode_overwrites_first_operand(opcode)) */
/* if(opcode == VOP_STORE) */
/* { */
/* //when using store save the indirect operand and set it as key and overwrite the value with a immediate value or register */
/* assert(ctx->function); */
/* vopcache_t *fnd = find_vopcache_by_key(ctx, &a); */
/* if(!fnd) */
/* { */
/* fnd = &ctx->function->vopcache[ctx->function->vopcacheindex]; */
/* ctx->function->vopcacheindex = (ctx->function->vopcacheindex + 1) % VOPCACHE_MAX; */
/* } */
/* fnd->key = a; */
/* fnd->value = b; */
/* } */
return instr;
}
static vinstr_t* emit_instruction3(compiler_t* ctx, vopcode_t opcode, voperand_t a, voperand_t b, voperand_t c)
{
vinstr_t* instr = emit_instruction(ctx, opcode);
set_operand(instr, 0, a);
set_operand(instr, 1, b);
set_operand(instr, 2, c);
instr->numoperands = 3;
return instr;
}
function_t *compiler_alloc_function(compiler_t *ctx, const char *name)
{
function_t gv;
gv.vopcacheindex = 0;
gv.index = ctx->numfunctions++;
/* gv.numreturns = 0; */
snprintf(gv.name, sizeof(gv.name), "%s", name);
gv.localvariablesize = 0;
//TODO: free/cleanup variables
gv.variables = hash_map_create_with_custom_allocator(variable_t, ctx->allocator, arena_alloc);
gv.arguments = hash_map_create_with_custom_allocator(variable_t, ctx->allocator, arena_alloc);
gv.bytecode = NULL;
gv.instructions = arena_alloc(ctx->allocator, sizeof(vinstr_t) * FUNCTION_MAX_INSTRUCTIONS);
gv.instruction_index = 0;
hash_map_insert(ctx->functions, name, gv);
//TODO: FIXME make insert return a reference to the data inserted instead of having to find it again.
return hash_map_find(ctx->functions, name);
}
void compiler_init(compiler_t *c, arena_t *allocator, int numbits, compiler_flags_t flags)
{
assert(numbits == 64);
memset(c, 0, sizeof(compiler_t));
c->flags = flags;
//x64
c->fts.longsize = 64;
c->fts.intsize = 32;
c->fts.shortsize = 16;
c->fts.charsize = 8;
c->fts.floatsize = 32;
c->fts.doublesize = 64;
c->fts.pointersize = 64;
c->vregindex = VREG_MAX;
c->labelindex = 0;
c->numbits = numbits;
c->allocator = allocator;
c->numfunctions = 0;
c->functions = hash_map_create_with_custom_allocator(function_t, c->allocator, arena_alloc);
// mainly just holder for global variables and maybe code without function
c->function = compiler_alloc_function(c, "_global_variables");
}
function_t* lookup_function_by_name(compiler_t* ctx, const char* name)
{
hash_map_foreach_entry(ctx->functions, it, {
if (!strcmp(it->key, name))
return it->data;
});
return NULL;
}
static int fundamental_type_size(compiler_t* ctx, int type)
{
switch (type)
{
case DT_CHAR:
return ctx->fts.charsize;
case DT_SHORT:
return ctx->fts.shortsize;
case DT_INT:
return ctx->fts.intsize;
case DT_LONG:
return ctx->fts.longsize;
case DT_FLOAT:
return ctx->fts.floatsize;
case DT_DOUBLE:
return ctx->fts.doublesize;
case DT_VOID:
return 0;
}
debug_printf("unhandled type %d\n", type);
return 0;
}
static variable_t *find_variable(compiler_t *ctx, const char *varname)
{
// try local variables first
variable_t *var = hash_map_find(ctx->function->variables, varname);
if(var)
return var;
// try arguments
var = hash_map_find(ctx->function->arguments, varname);
if(var)
return var;
//TODO: globals
return NULL;
}
static int data_type_size(compiler_t* ctx, ast_node_t* n)
{
switch (n->type)
{
case AST_FUNCTION_CALL_EXPR:
{
ast_node_t* callee = n->call_expr_data.callee;
function_t* fn = lookup_function_by_name(ctx, callee->identifier_data.name);
assert(fn);
return fn->returnsize;
}
break;
case AST_LITERAL:
{
ast_literal_t *lit = &n->literal_data;
if(lit->integer.suffix == INTEGER_SUFFIX_LONG_LONG || lit->integer.suffix == INTEGER_SUFFIX_LONG)
{
return ctx->fts.longsize;
}
return ctx->fts.intsize;
}
break;
case AST_STRUCT_DATA_TYPE:
{
int total = 0;
ast_node_t* ref = n->data_type_data.data_type;
assert(ref);
if (ref->type == AST_UNION_DECL)
{
for (int i = 0; i < ref->struct_decl_data.numfields; ++i)
{
int tmp = data_type_size(ctx, ref->struct_decl_data.fields[i]->variable_decl_data.data_type);
if (tmp > total)
total = tmp;
}
}
else if (ref->type == AST_STRUCT_DECL)
{
for (int i = 0; i < ref->struct_decl_data.numfields; ++i)
total += data_type_size(ctx, ref->struct_decl_data.fields[i]->variable_decl_data.data_type);
}
else
{
/* debug_printf("unhandled struct data type node '%s', can't get size\n", */
/* AST_NODE_TYPE_to_string(ref->type)); */
}
return total;
}
break;
case AST_IDENTIFIER:
{
variable_t* var = find_variable(ctx, n->identifier_data.name);
assert(var);
return data_type_size(ctx, var->data_type_node);
}
break;
case AST_DATA_TYPE:
return data_type_size(ctx, n->data_type_data.data_type);
case AST_POINTER_DATA_TYPE:
return ctx->fts.pointersize;
case AST_PRIMITIVE:
return fundamental_type_size(ctx, n->primitive_data.primitive_type);
case AST_ARRAY_DATA_TYPE:
{
assert(n->data_type_data.array_size > 0);
if (n->data_type_data.data_type->type == AST_ARRAY_DATA_TYPE)
return data_type_size(ctx, n->data_type_data.data_type) * n->data_type_data.array_size;
else if (n->data_type_data.data_type->type == AST_PRIMITIVE)
{
// printf("array size = %d, primitive_type_size = %d\n", n->data_type_data.array_size,
// primitive_data_type_size( n->data_type_data.data_type->primitive_data_type_data.primitive_type ));
return fundamental_type_size(ctx, n->data_type_data.data_type->primitive_data.primitive_type) *
n->data_type_data.array_size;
}
else
{
perror("unhandled else for data_type_size\n");
return 0;
}
}
break;
}
/* debug_printf("unhandled data type node '%s', can't get size\n", AST_NODE_TYPE_to_string(n->type)); */
return 0;
}
static bool voperand_is_floating_point(voperand_t* o)
{
return o->size == VOPERAND_SIZE_DOUBLE ||
o->size == VOPERAND_SIZE_FLOAT; // || o->type == VOPERAND_REGISTER && o->reg.usage == VRU_FLOATING_POINT;
}
static void store_operand(compiler_t *ctx, voperand_t *dst, voperand_t *src)
{
switch(dst->type)
{
case VOPERAND_INDIRECT_REGISTER:
case VOPERAND_INDIRECT_REGISTER_DISPLACEMENT:
case VOPERAND_INDIRECT_REGISTER_INDEXED:
case VOPERAND_INDIRECT:
if (src->size == dst->size)
{
/* emit_instruction2(ctx, VOP_STORE, *dst, *src); */
emit_instruction2(ctx, VOP_MOV, *dst, *src);
}
else
{
bool fa = voperand_is_floating_point(dst);
bool fb = voperand_is_floating_point(src);
if(!fa && !fb)
{
//TODO: handle native to 8/16/32/64 bits
emit_instruction2(ctx, VOP_MOV, *dst, *src);
/* emit_instruction2(ctx, VOP_STORE, *dst, *src); */
} else
{
// making a whole of assumptions here... hmm
// TODO: FIXME
voperand_t iop = register_operand(get_vreg(ctx));
iop.size = dst->size;
emit_instruction2(ctx, VOP_FPTOSI, iop, *src);
emit_instruction2(ctx, VOP_MOV, *dst, iop);
/* emit_instruction2(ctx, VOP_STORE, *dst, iop); */
*dst = iop;
}
}
break;
default:
perror("unhandled store operand type");
break;
}
}
static vinstr_t *previous_instruction(compiler_t *ctx)
{
assert(ctx->function);
if(ctx->function->instruction_index == 0)
return NULL;
return &ctx->function->instructions[ctx->function->instruction_index - 1];
}
static void try_reuse_operand(compiler_t* ctx, voperand_t* op)
{
/* assert(ctx->function); */
/* for (size_t i = 0; i < ctx->function->vopcacheindex; ++i) */
/* { */
/* /\* print_instruction_operand(&ctx->function->vopcache[i].key, false); *\/ */
/* /\* printf("\t\t\t"); *\/ */
/* /\* print_instruction_operand(&ctx->function->vopcache[i].value, false); *\/ */
/* /\* printf("\t\t\t"); *\/ */
/* /\* print_instruction_operand(op, false); *\/ */
/* /\* printf("\n"); *\/ */
/* if (!memcmp(&ctx->function->vopcache[i].key, op, sizeof(voperand_t))) */
/* { */
/* *op = ctx->function->vopcache[i].value; */
/* break; */
/* } */
/* } */
}
static void load_operand(compiler_t* ctx, voperand_t* dst, voperand_t* src)
{
try_reuse_operand(ctx, src);
assert(dst->type == VOPERAND_REGISTER);
if (dst->reg.index >= VREG_MAX)
dst->size = src->size;
switch (src->type)
{
case VOPERAND_REGISTER:
if (dst->size != src->size && dst->reg.index != src->reg.index)
emit_instruction2(ctx, VOP_MOV, *dst, *src);
else
*dst = *src;
break;
case VOPERAND_IMMEDIATE:
emit_instruction2(ctx, VOP_MOV, *dst, *src);
break;
case VOPERAND_INDIRECT_REGISTER_DISPLACEMENT:
case VOPERAND_INDIRECT:
case VOPERAND_INDIRECT_REGISTER_INDEXED:
case VOPERAND_INDIRECT_REGISTER:
{
//commented out should be fixed by vopcache
/* vinstr_t* prev = previous_instruction(ctx); */
/* if (prev && prev->opcode == VOP_STORE) */
/* { */
/* voperand_t* prevsrc = &prev->operands[1]; */
/* if(voperand_equal(prevsrc, dst)) */
/* { */
/* *dst = prev->operands[0]; */
/* return; */
/* } */
/* } */
emit_instruction2(ctx, VOP_MOV, *dst, *src);
/* emit_instruction2(ctx, VOP_LOAD, *dst, *src); */
}
break;
default:
perror("unhandled load operand type");
break;
}
}
bool lvalue( compiler_t* ctx, ast_node_t* n, voperand_t *dst )
{
switch ( n->type )
{
case AST_IDENTIFIER:
{
variable_t* var = find_variable(ctx, n->identifier_data.name);
assert(var);
ast_node_t* variable_type = var->data_type_node;
int numbytes = data_type_size(ctx, variable_type) / 8;
vregister_t bpreg = {.index = VREG_BP};
#define INDIRECT_ADDRESSING
#ifndef INDIRECT_ADDRESSING
vregister_t tmpr = get_vreg(ctx);
voperand_t tmp = register_operand(tmpr);
emit_instruction2(ctx, VOP_MOV, tmp, register_operand(bpreg));
emit_instruction2(ctx, VOP_ADD, tmp, imm32_operand(var->offset));
voperand_t src = indirect_register_operand(tmpr);
#else
voperand_t src = indirect_register_displacement_operand(bpreg, var->offset, numbytes);
#endif
if (variable_type->type == AST_PRIMITIVE)
{
/* *dst = register_operand(get_vreg_with_usage(ctx, VRU_FLOATING_POINT)); */
/* emit_instruction2(ctx, VOP_SITOFP, *dst, src); */
if (variable_type->primitive_data.primitive_type == DT_DOUBLE)
src.size = VOPERAND_SIZE_DOUBLE;
if (variable_type->primitive_data.primitive_type == DT_FLOAT)
src.size = VOPERAND_SIZE_FLOAT;
}
// check whether we already referenced this before
/* for (size_t i = 0; i < ctx->function->instruction_index; ++i) */
/* { */
/* vinstr_t* instr = &ctx->function->instructions[i]; */
/* if (instr->opcode != VOP_LEA) */
/* continue; */
/* if (memcmp(&instr->operands[1], &src, sizeof(voperand_t))) */
/* continue; */
/* *dst = instr->operands[0]; */
/* return true; */
/* } */
/* *dst = indirect_register_operand(get_vreg(ctx)); */
/* emit_instruction2(ctx, VOP_LEA, *dst, src); */
*dst = src;
} break;
default:
printf("unhandled node type %s\n", ast_node_type_t_to_string(n->type));
return false;
}
return true;
}
static int deduce_literal_type(int a, int b)
{
//if they're both the same, return the literal type
//e.g LITERAL_INT and LITERAL_INT
if(a == b)
return a;
//TODO: FIXME LITERAL_STRING
//casting pointer to int/flt/dbl and vice versa
//double > float > long long > long > short > char
static int highest = -1;
static int order[] = {LITERAL_NUMBER,LITERAL_INTEGER,LITERAL_STRING};
for(int i = 0; i < COUNT_OF(order); ++i)
{
if(order[i] == a || order[i] == b)
{
highest = order[i];
break;
}
}
assert(highest != -1);
return highest;
}
typedef struct
{
int node_type;
void (*callback)(compiler_t*, ast_node_t*, voperand_t*);
} rvalue_map_t;
void literal(compiler_t* ctx, ast_node_t* n, voperand_t* dst)
{
ast_literal_t *lit = &n->literal_data;
switch (lit->type)
{
case LITERAL_INTEGER:
{
voperand_t op = {.type = VOPERAND_IMMEDIATE};
op.imm.is_unsigned = lit->integer.is_unsigned;
op.imm.nbits = data_type_size(ctx, n);
if(op.imm.nbits == 64)
op.imm.dq = lit->integer.value;
else
{
//TODO: FIXME unsigned etc conversions
op.imm.dw = (i32)lit->integer.value;
}
*dst = op;
}
break;
case LITERAL_NUMBER:
{
i64 as_int;
double as_double = (double)lit->scalar.value;
assert(sizeof(double) == sizeof(as_int));
memcpy(&as_int, &as_double, sizeof(as_int));
*dst = imm64_operand(as_int);
dst->size = VOPERAND_SIZE_DOUBLE;
/* *dst = register_operand(get_vreg_with_usage(ctx, VRU_FLOATING_POINT)); */
/* emit_instruction2(ctx, VOP_SITOFP, *dst, imm64_operand(as_int)); */
}
break;
default:
perror("unhandled literal");
break;
}
}
static size_t instruction_index(compiler_t* ctx)
{
assert(ctx->function);
return ctx->function->instruction_index - 1;
}
void bin_expr(compiler_t* ctx, ast_node_t* n, voperand_t* dst)
{
voperand_t lhs, rhs;
rvalue(ctx, n->bin_expr_data.lhs, &lhs);
rvalue(ctx, n->bin_expr_data.rhs, &rhs);
switch (n->bin_expr_data.operator)
{
case '+':
case '-':
case '/':
case '*':
case '%':
case '^':
case '&':
case '|':
case '!':
{
static int opcode_map[] = {
['+'] = VOP_ADD, ['-'] = VOP_SUB, ['/'] = VOP_DIV, ['*'] = VOP_MUL, ['%'] = VOP_MOD,
['^'] = VOP_XOR, ['&'] = VOP_AND, ['|'] = VOP_OR, ['!'] = VOP_NOT};
static int opcode_map_flt[] = {
['+'] = VOP_FADD, ['-'] = VOP_FSUB, ['/'] = VOP_FDIV, ['*'] = VOP_FMUL, ['%'] = VOP_FMOD
};
bool fa = voperand_is_floating_point(&lhs);
bool fb = voperand_is_floating_point(&rhs);
if(fa || fb)
{
voperand_t fop = register_operand(get_vreg(ctx));
fop.size = VOPERAND_SIZE_DOUBLE;
if(!fa)
{
emit_instruction2(ctx, VOP_SITOFP, fop, lhs);
lhs = fop;
}
if(!fb)
{
emit_instruction2(ctx, VOP_SITOFP, fop, rhs);
rhs = fop;
}
*dst = register_operand(get_vreg(ctx));
dst->size = VOPERAND_SIZE_DOUBLE;
/* *dst = register_operand(get_vreg_with_usage(ctx, VRU_FLOATING_POINT)); */
if (ctx->flags & COMPILER_FLAGS_ALU_THREE_OPERANDS)
{
emit_instruction3(ctx, opcode_map_flt[n->bin_expr_data.operator], *dst, lhs, rhs);
} else
{
load_operand(ctx, dst, &lhs);
emit_instruction2(ctx, opcode_map_flt[n->bin_expr_data.operator], *dst, rhs);
}
}
else
{
if(ctx->flags & COMPILER_FLAGS_ALU_THREE_OPERANDS)
{
*dst = register_operand(get_vreg(ctx));
emit_instruction3(ctx, opcode_map[n->bin_expr_data.operator], *dst, lhs, rhs);
} else
{
*dst = register_operand(get_vreg(ctx));
load_operand(ctx, dst, &lhs);
emit_instruction2(ctx, opcode_map[n->bin_expr_data.operator], *dst, rhs);
}
}
}
break;
case '>':
case '<':
case TK_LEQUAL:
case TK_GEQUAL:
case TK_EQUAL:
case TK_NOT_EQUAL:
{
static int opcode_map[] = {
['>'] = VOP_JG,
['<'] = VOP_JL,
[TK_LEQUAL] = VOP_JLE,
[TK_GEQUAL] = VOP_JGE,
[TK_EQUAL] = VOP_JNZ,
[TK_NOT_EQUAL] = VOP_JZ
};
emit_instruction2(ctx, VOP_CMP, lhs, rhs);
voperand_t regop = register_operand(get_vreg(ctx));
emit_instruction2(ctx, VOP_MOV, regop, imm32_operand(1));
vinstr_t* jle = emit_instruction(ctx, opcode_map[n->bin_expr_data.operator]);
voperand_t jle_label = label_operand(get_label(ctx));
set_operand(jle, 0, jle_label);
emit_instruction2(ctx, VOP_MOV, regop, imm32_operand(0));
/* set_operand(jle, 0, imm32_operand(instruction_index(ctx) - jle->index)); */
emit_instruction1(ctx, VOP_LABEL, jle_label);
*dst = regop;
} break;
default:
{
perror("unhandled operator");
}
break;
}
}
void assignment_expr(compiler_t* ctx, ast_node_t* n, voperand_t* dst)
{
voperand_t lhs, rhs;
lvalue(ctx, n->assignment_expr_data.lhs, &lhs);
rvalue(ctx, n->assignment_expr_data.rhs, &rhs);
store_operand(ctx, &lhs, &rhs);
/* printf("store %s, %s\n", operand_to_string(lhs), operand_to_string(rhs)); */
*dst = rhs;
}
void function_call_expr(compiler_t* ctx, ast_node_t* n, voperand_t* dst)
{
ast_node_t** args = n->call_expr_data.arguments;
int numargs = n->call_expr_data.numargs;
ast_node_t* callee = n->call_expr_data.callee;
function_t* fn = lookup_function_by_name(ctx, callee->identifier_data.name);
size_t cost = 0;
for(size_t i = 0; i < numargs; ++i)
{
ast_node_t* arg = args[numargs - i - 1];
assert(arg->type == AST_IDENTIFIER || arg->type == AST_PRIMITIVE || arg->type == AST_LITERAL || arg->type == AST_FUNCTION_CALL_EXPR);
int vs = data_type_size(ctx, arg) / 8;
assert(vs > 0);
voperand_t op;
rvalue(ctx, arg, &op);
emit_instruction1(ctx, VOP_PUSH, op);
cost += vs;
}
assert(cost == fn->argcost);
emit_instruction1(ctx, VOP_CALL, imm32_operand(fn->index));
vregister_t spreg = {.index = VREG_SP};
emit_instruction2(ctx, VOP_ADD, register_operand(spreg), imm32_operand(fn->argcost));
vregister_t retreg = {.index = VREG_RETURN_VALUE };
*dst = register_operand(retreg);
/* if(!fn) */
/* { */
/* printf("can't find function '%s'\n", callee->identifier_data.name); */
/* return; */
/* } */
/* emit_instruction1(ctx, VOP_CALL, imm32_operand(fn->index)); */
}
rvalue_map_t rvalues[] = {{AST_LITERAL, literal},
{AST_BIN_EXPR, bin_expr},
{AST_ASSIGNMENT_EXPR, assignment_expr},
{AST_FUNCTION_CALL_EXPR, function_call_expr}};
bool rvalue(compiler_t* ctx, ast_node_t* n, voperand_t* dst)
{
for(size_t i = 0; i < COUNT_OF(rvalues); ++i)
{
if(rvalues[i].node_type == n->type)
{
rvalues[i].callback(ctx, n, dst);
try_reuse_operand(ctx, dst);
return true;
}
}
voperand_t lhs;
if (!lvalue(ctx, n, &lhs))
{
printf("unhandled rvalue '%s'\n", ast_node_type_t_to_string(n->type));
return false;
}
*dst = register_operand(get_vreg(ctx));
load_operand(ctx, dst, &lhs);
/* emit_instruction2(ctx, VOP_MOV, *dst, lhs); */
/* printf("load %s, %s\n", operand_to_string(*dst), operand_to_string(lhs)); */
return true;
}
#define compiler_assert(ctx, expr, ...) \
compiler_assert_r(ctx, (intptr_t)expr, #expr, ## __VA_ARGS__)
static void compiler_assert_r(compiler_t *ctx, int expr, const char *expr_str, const char *fmt, ...)
{
if(expr)
return;
char buffer[512] = { 0 };
va_list va;
va_start( va, fmt );
vsnprintf( buffer, sizeof( buffer ), fmt, va );
debug_printf( "compiler assert failed: '%s' %s\n", expr_str, buffer );
va_end( va );
longjmp(ctx->jmp, 1);
}
static ast_node_t *allocate_variable(compiler_t *ctx, ast_node_t *n, const char *varname, int offset, int size)
{
variable_t tv = { .offset = offset, .is_param = 0, .data_type_node = n->variable_decl_data.data_type };
hash_map_insert( ctx->function->variables, varname, tv );
}
typedef struct
{
int node_type;
bool (*callback)(compiler_t*, ast_node_t*);
} ast_node_map_t;
bool program(compiler_t* ctx, ast_node_t* n)
{
linked_list_reversed_foreach(n->program_data.body, ast_node_t**, it, { compile_visit_node(ctx, (*it)); });
}
bool return_statement(compiler_t* ctx, ast_node_t* n)
{
voperand_t op;
rvalue(ctx, n->return_stmt_data.argument, &op);
vregister_t retreg = {.index = VREG_RETURN_VALUE };
voperand_t retop = register_operand(retreg);
load_operand(ctx, &retop, &op);
emit_instruction1(ctx, VOP_JMP, ctx->function->eoflabel);
/* ctx->function->returns[ctx->function->numreturns++] = emit_instruction1(ctx, VOP_JMP, imm32_operand(0)); */
return true;
}
bool block_statement(compiler_t* ctx, ast_node_t* n)
{
// TODO: stack of scopes
linked_list_reversed_foreach(n->block_stmt_data.body, ast_node_t**, it, { compile_visit_node(ctx, *it); });
return true;
}
bool function_declaration(compiler_t* ctx, ast_node_t* n)
{
if (n->func_decl_data.body)
{
const char* function_name = n->func_decl_data.id->identifier_data.name;
function_t* oldfunc = ctx->function;
function_t* tmp = hash_map_find(ctx->functions, function_name);
compiler_assert(ctx, !tmp, "function already exists '%s'", function_name);
function_t* func = compiler_alloc_function(ctx, function_name);
ctx->function = func;
func->eoflabel = label_operand(get_label(ctx));
func->returnsize = data_type_size(ctx, n->func_decl_data.return_data_type);
emit_instruction(ctx, VOP_ENTER);
/* vregister_t bpreg = {.index = VREG_BP, .usage = VRU_GENERAL_PURPOSE}; */
/* vregister_t spreg = {.index = VREG_SP, .usage = VRU_GENERAL_PURPOSE}; */
/* emit_instruction1(ctx, VOP_PUSH, register_operand(bpreg)); */
/* emit_instruction2(ctx, VOP_MOV, register_operand(bpreg), register_operand(spreg)); */
// TODO: FIXME can't add any new functions to the functions hash map or otherwise ctx->function gets invalidated
// maybe store function name instead
// TODO: FIXME
ast_function_decl_t* fd = &n->func_decl_data;
ast_node_t **parms = fd->parameters;
int poffset = 8;
int numbytesarg = 0;
for(size_t i = 0; i < fd->numparms; ++i)
{
const char* variable_name = parms[i]->variable_decl_data.id->identifier_data.name;
variable_t* tmp = hash_map_find(ctx->function->arguments, variable_name);
compiler_assert(ctx, !tmp, "function argument already exists '%s'", variable_name);
variable_t tv = {.offset = poffset, .is_param = 1, .data_type_node = parms[i]->variable_decl_data.data_type};
hash_map_insert(ctx->function->arguments, variable_name, tv);
int variable_size = data_type_size(ctx, parms[i]->variable_decl_data.data_type);
poffset += variable_size / 8;
numbytesarg += variable_size / 8;
//TODO: handle pass by value with rep movsd etc, or just use only pointers for now
}
func->argcost = numbytesarg;
// add up all the variables in the function's scope and calculate how much space in bytes we need to allocate
/* traverse_context_t traverse_ctx = {0}; */
/* ast_node_t* variable_declarations[32]; */
/* size_t num_variable_declarations = */
/* ast_tree_nodes_by_type(&traverse_ctx, n->func_decl_data.body, AST_VARIABLE_DECL, &variable_declarations, */
/* COUNT_OF(variable_declarations)); */
// printf("vars %d\n", num_variable_declarations);
int offset = -4;
size_t numbytes = 0;
ast_node_t **declarations = fd->declarations;
for (size_t i = 0; i < fd->numdeclarations; ++i)
{
const char* variable_name = declarations[i]->variable_decl_data.id->identifier_data.name;
variable_t* tmp = hash_map_find(ctx->function->variables, variable_name);
compiler_assert(ctx, !tmp, "variable already exists '%s'", variable_name);
int variable_size = data_type_size(ctx, declarations[i]->variable_decl_data.data_type);
size_t nb = variable_size / 8;
allocate_variable(ctx, declarations[i], variable_name, offset, nb);
/* printf("var name = %s %s, offset = %d, numbits=%d\n", ast_node_type_t_to_string(declarations[i]->type), variable_name, offset, variable_size / 8); */
offset -= nb;
numbytes += nb;
}
vregister_t bpreg = {.index = VREG_BP};
// allocate space for local variables
/* // align to 16 bytes */
/* numbytes += 16 - (numbytes % 16); */
/* emit_instruction2(ctx, VOP_SUB, register_operand(bpreg), imm32_operand(numbytes)); */
emit_instruction1(ctx, VOP_ALLOCA, imm32_operand(numbytes));
compile_visit_node(ctx, n->func_decl_data.body);
/* for (size_t i = 0; i < func->numreturns; ++i) */
/* { */
/* set_operand(func->returns[i], 0, imm32_operand(instruction_index(ctx) - func->returns[i]->index)); */
/* } */
emit_instruction1(ctx, VOP_LABEL, ctx->function->eoflabel);
emit_instruction(ctx, VOP_LEAVE);
/* emit_instruction2(ctx, VOP_MOV, register_operand(spreg), register_operand(bpreg)); */
/* emit_instruction1(ctx, VOP_POP, register_operand(bpreg)); */
emit_instruction(ctx, VOP_RET);
ctx->function = oldfunc;
}
else
{
perror("todo implement");
return false;
}
return true;
}
bool variable_declaration(compiler_t* ctx, ast_node_t* n)
{
ast_node_t* id = n->variable_decl_data.id;
ast_node_t* iv = n->variable_decl_data.initializer_value;
if (iv)
{
ast_node_t c = {.type = AST_ASSIGNMENT_EXPR};
c.assignment_expr_data.lhs = id;