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astparse.c
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astparse.c
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/*
* astparse.c
* Ryan Mallon (2005)fg
*
* Functions for parsing the AST to produce intermediate code
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "ast.h"
#include "ast_xml.h"
#include "typechk.h"
#include "symtable.h"
#include "utype.h"
#include "cerror.h"
#include "icg.h"
#include "mir.h"
#include "tempreg.h"
#include "strings.h"
#include "astparse.h"
#include "debug.h"
#include "cflags.h"
#include "history.h"
/* Type check macros */
#define node_type_info(n) n->type_check->type_info
#define child_type_info(n, c) n->node.children[c]->type_check->type_info
extern int alloced_regs(void);
static int generate_member_load(ast_node_t *);
static expression_t *parse_member(ast_node_t *);
static expression_t *parse_var(ast_node_t *);
static expression_t *parse_expression(ast_node_t *);
static void parse_statement(ast_node_t *);
static void parse_func(ast_node_t *);
static void parse_block(ast_node_t *);
static void parse_decl_subtrees(ast_node_t *);
static int is_in_register(char *);
static void clear_register_stores(void);
extern scope_node_t *global_scope, *current_scope;
extern compiler_options_t cflags;
ic_list_t *entry_point_jump;
/* Current structure */
static name_record_t *current_struct = NULL;
/* Current array index. Used for history array functions */
static expression_t *array_index = NULL;
int src_line_num;
/*
* Parse a struct member.
*/
expression_t *parse_member(ast_node_t *expr) {
ast_node_t *name_node, *current;
name_record_t *var, *member;
expression_t *result;
int reg, i, base_reg, indirect_levels = 0;
/* Get struct name */
name_node = expr;
while(name_node->node_type == NODE_OPERATOR)
name_node = name_node->node.children[0];
var = get_var_entry(name_node->leaf.name);
/* Parse left hand side */
result = parse_expression(expr->node.children[0]);
base_reg = result->op_val;
if(!current_struct)
current_struct = result->var;
/* Parse right hand side */
result = parse_expression(expr->node.children[1]);
member = result->var;
reg = tr_alloc();
mir_emit(MIR_ADD, mir_var(current_struct), mir_const(member->offset),
mir_reg(reg));
/* Check if the member is also a struct */
if(is_struct_type(member->type_info)) {
char *name = get_name_from_node(expr->node.children[1]);
current_struct = get_utype_member(var, name);
} else
current_struct = NULL;
result->op_type = OP_REG;
result->size = sizeof_type(member->type_info);
result->var = member;
result->op_val = reg;
return result;
}
/*
* Parse a variable
*/
static expression_t *parse_var(ast_node_t *var_node) {
name_record_t *var;
name_record_t *func;
expression_t *result;
int i, offset;
src_line_num = var_node->src_line_num;
if(var_node->node.op == NODE_MEMBER)
return parse_member(var_node);
if(var_node->node.op == NODE_CAST)
compiler_error(CERROR_ERROR, var_node->src_line_num,
"Illegal use of cast\n");
result = malloc(sizeof(expression_t));
#if 0
result->ast_node = var_node;
#endif
if(var_node->node_type != NODE_LEAF_ID)
compiler_error(CERROR_ERROR, var_node->src_line_num,
"Attempting to parse non-leaf variable\n");
if(!current_struct)
var = get_var_entry(var_node->leaf.name);
else
var = get_utype_member(current_struct, var_node->leaf.name);
if(!var)
compiler_error(CERROR_ERROR, var_node->src_line_num,
"Variable %s undeclared\n", var_node->leaf.name);
result->op_type = OP_VAR;
result->indirect = 0;
result->size = sizeof_type(var->type_info);
result->var = var;
return result;
}
/*
* Parse an expression
*
* TODO: Sizes are just assumed to be the size of the lefthand side type.
*
*/
static expression_t *parse_expression(ast_node_t *expr) {
expression_t *result, *t1, *t2;
mir_node_t *mcurrent, *mlabel1, *mlabel2, *mlabel3;
int i, size, reg;
src_line_num = expr->src_line_num;
result = malloc(sizeof(expression_t));
#if 0
result->ast_node = expr;
#endif
if(expr->node_type == NODE_OPERATOR) {
switch(expr->node.op) {
case NODE_ADD:
t1 = parse_expression(expr->node.children[0]);
t2 = parse_expression(expr->node.children[1]);
array_index = t2;
/* Pass the variable name for arrays and pointers */
if(t1->var && (is_array_type(t1->var->type_info) ||
is_address_type(t1->var->type_info)))
result->var = t1->var;
else if(t2->var && (is_array_type(t2->var->type_info) ||
is_address_type(t2->var->type_info)))
result->var = t2->var;
result->op_history = t1->op_history;
result->size = t1->size;
result->op_type = OP_REG;
result->op_val = tr_alloc();
if(expr->type_check) {
if(is_address_type(node_type_info(expr))) {
/* Pointer Addition. Ptr/Array must be on left */
size = sizeof_type(node_type_info(expr));
/*
* For index-wise arrays pointer addition adds a full
* size of the array.
*/
if(is_history_type(t1->var->type_info) &&
is_array_type(t1->var->type_info) &&
history_array_type(t1->var->type_info) == HISTORY_INDEX_WISE)
size *= get_num_elements(t1->var->type_info);
mir_emit(MIR_MUL, mir_opr(t2), mir_const(size),
mir_opr(result));
mir_emit(MIR_ADD, mir_opr(t1), mir_opr(result),
mir_opr(result));
} else {
/* Normal addition */
mir_emit(MIR_ADD, mir_opr(t1), mir_opr(t2),
mir_opr(result));
}
}
#if 0
/* Call strcat for strings, add op for everything else */
if(expr->type_check && is_primitive(node_type_info(expr)) &&
is_string_type(node_type_info(expr)))
string_strcat(t1->op_val, t2->op_val, result->op_val);
#endif
break;
case NODE_SUB:
t1 = parse_expression(expr->node.children[0]);
t2 = parse_expression(expr->node.children[1]);
/* Pass the variable name for arrays and pointers */
if(t1->var && (is_array_type(t1->var->type_info) ||
is_address_type(t1->var->type_info)))
result->var = t1->var;
else if(t2->var && (is_array_type(t2->var->type_info) ||
is_address_type(t2->var->type_info)))
result->var = t2->var;
result->op_type = OP_REG;
result->size = t1->size;
result->op_val = tr_alloc();
if(expr->type_check) {
if(is_address_type(node_type_info(expr))) {
/* Pointer subtraction */
size = sizeof_type(node_type_info(expr));
mir_emit(MIR_MUL, mir_opr(t2), mir_const(size), mir_opr(result));
mir_emit(MIR_SUB, mir_opr(t1), mir_opr(result), mir_opr(result));
} else {
/* Normal subtraction */
mir_emit(MIR_SUB, mir_opr(t1), mir_opr(t2),
mir_opr(result));
}
}
break;
case NODE_MINUS:
if(expr->node.children[0]->node_type == NODE_LEAF_NUM) {
expr->node.children[0]->leaf.val = -expr->node.children[0]->leaf.val;
}
result = parse_expression(expr->node.children[0]);
break;
case NODE_DIV:
t1 = parse_expression(expr->node.children[0]);
t2 = parse_expression(expr->node.children[1]);
result->op_type = OP_REG;
result->size = t1->size;
result->op_val = tr_alloc();
mir_emit(MIR_DIV, mir_opr(t1), mir_opr(t2),
mir_opr(result));
break;
case NODE_MUL:
t1 = parse_expression(expr->node.children[0]);
t2 = parse_expression(expr->node.children[1]);
result->op_type = OP_REG;
result->size = t1->size;
result->op_val = tr_alloc();
mir_emit(MIR_MUL, mir_opr(t1), mir_opr(t2),
mir_opr(result));
break;
case NODE_OR:
t1 = parse_expression(expr->node.children[0]);
t2 = parse_expression(expr->node.children[1]);
result->op_type = OP_REG;
result->size = t1->size;
result->op_val = tr_alloc();
reg = tr_alloc();
mir_emit(MIR_MOVE, mir_const(1), NULL,
mir_opr(result));
mir_emit(MIR_NEQ, mir_opr(t1), mir_const(0),
mir_reg(reg));
mlabel1 = mir_emit(MIR_IF, mir_reg(reg), NULL, NULL);
mir_emit(MIR_NEQ, mir_opr(t2), mir_const(0),
mir_reg(reg));
mlabel2 = mir_emit(MIR_IF, mir_reg(reg), NULL, NULL);
mlabel3 = mir_emit(MIR_MOVE, mir_const(0), NULL,
mir_opr(result));
mir_set_jump(mlabel1, mlabel3->next);
mir_set_jump(mlabel2, mlabel3->next);
break;
case NODE_AND:
t1 = parse_expression(expr->node.children[0]);
t2 = parse_expression(expr->node.children[1]);
result->op_type = OP_REG;
result->size = t1->size;
result->op_val = tr_alloc();
reg = tr_alloc();
mir_emit(MIR_MOVE, mir_const(0), NULL,
mir_opr(result));
mir_emit(MIR_EQL, mir_opr(t1), mir_const(0),
mir_reg(reg));
mlabel1 = mir_emit(MIR_IF, mir_reg(reg), NULL, NULL);
mir_emit(MIR_EQL, mir_opr(t1), mir_const(0),
mir_reg(reg));
mlabel2 = mir_emit(MIR_IF, mir_reg(reg), NULL, NULL);
mlabel3 = mir_emit(MIR_MOVE, mir_const(1), NULL,
mir_opr(result));
mir_set_jump(mlabel1, mlabel3->next);
mir_set_jump(mlabel2, mlabel3->next);
break;
case NODE_EQL:
t1 = parse_expression(expr->node.children[0]);
t2 = parse_expression(expr->node.children[1]);
result->op_val = tr_alloc();
result->op_type = OP_REG;
result->size = t1->size;
mir_emit(MIR_MOVE, mir_const(0), NULL,
mir_reg(result->op_val));
mlabel1 = mir_emit(MIR_IF, mir_opr(t1), mir_opr(t2),
mir_const(MIR_NEQ));
mlabel2 = mir_emit(MIR_MOVE, mir_const(1), NULL,
mir_reg(result->op_val));
mir_set_jump(mlabel1, mlabel2->next);
#if 0
/* String equality */
if(cflags.flags & CFLAG_OUTPUT_IC) {
if(expr->type_check && is_primitive(node_type_info(expr)) &&
is_string_type(node_type_info(expr))) {
string_strcmp(t1->op_val, t2->op_val);
label1 = ic_emit(IC_BEQ, result->op_val, IC_RV, -1,
IC_REG, IC_REG, IC_LABEL);
} else {
label1 = ic_emit(IC_BEQ, t1->op_val, t2->op_val, -1,
IC_REG, IC_REG, IC_LABEL);
}
label2 = ic_emit(IC_LIT, 0, result->op_val, 0,
IC_CONST, IC_REG, IC_NONE);
ic_set_jump(&label1, label2->next);
}
#endif
break;
case NODE_NEQ:
t1 = parse_expression(expr->node.children[0]);
t2 = parse_expression(expr->node.children[1]);
result->op_type = OP_REG;
result->size = t1->size;
result->op_val = tr_alloc();
mir_emit(MIR_MOVE, mir_const(0), NULL,
mir_reg(result->op_val));
mlabel1 = mir_emit(MIR_IF, mir_opr(t1), mir_opr(t2),
mir_const(MIR_EQL));
mlabel2 = mir_emit(MIR_MOVE, mir_const(1), NULL,
mir_reg(result->op_val));
mir_set_jump(mlabel1, mlabel2->next);
break;
case NODE_LSS:
t1 = parse_expression(expr->node.children[0]);
t2 = parse_expression(expr->node.children[1]);
result->op_type = OP_REG;
result->size = t1->size;
result->op_val = tr_alloc();
mir_emit(MIR_MOVE, mir_const(0), NULL,
mir_reg(result->op_val));
mlabel1 = mir_emit(MIR_IF, mir_opr(t1), mir_opr(t2),
mir_const(MIR_GEQ));
mlabel2 = mir_emit(MIR_MOVE, mir_const(1), NULL,
mir_reg(result->op_val));
mir_set_jump(mlabel1, mlabel2->next);
break;
case NODE_LEQ:
t1 = parse_expression(expr->node.children[0]);
t2 = parse_expression(expr->node.children[1]);
result->op_type = OP_REG;
result->size = t1->size;
result->op_val = tr_alloc();
mir_emit(MIR_MOVE, mir_const(0), NULL,
mir_reg(result->op_val));
mlabel1 = mir_emit(MIR_IF, mir_opr(t1), mir_opr(t2),
mir_const(MIR_GTR));
mlabel2 = mir_emit(MIR_MOVE, mir_const(1), NULL,
mir_reg(result->op_val));
mir_set_jump(mlabel1, mlabel2->next);
break;
case NODE_GTR:
t1 = parse_expression(expr->node.children[0]);
t2 = parse_expression(expr->node.children[1]);
result->op_type = OP_REG;
result->size = t1->size;
result->op_val = tr_alloc();
mir_emit(MIR_MOVE, mir_const(0), NULL,
mir_reg(result->op_val));
mlabel1 = mir_emit(MIR_IF, mir_opr(t1), mir_opr(t2),
mir_const(MIR_LEQ));
mlabel2 = mir_emit(MIR_MOVE, mir_const(1), NULL,
mir_reg(result->op_val));
mir_set_jump(mlabel1, mlabel2->next);
break;
case NODE_GEQ:
t1 = parse_expression(expr->node.children[0]);
t2 = parse_expression(expr->node.children[1]);
result->op_type = OP_REG;
result->size = t1->size;
result->op_val = tr_alloc();
mir_emit(MIR_MOVE, mir_const(0), NULL,
mir_reg(result->op_val));
mlabel1 = mir_emit(MIR_IF, mir_opr(t1), mir_opr(t2),
mir_const(MIR_LSS));
mlabel2 = mir_emit(MIR_MOVE, mir_const(1), NULL,
mir_reg(result->op_val));
mir_set_jump(mlabel1, mlabel2->next);
break;
case NODE_CAST:
t1 = parse_expression(expr->node.children[1]);
result->op_type = OP_REG;
result->op_val = t1->op_val;
result->var = t1->var;
result->size = t1->size;
break;
case NODE_POINTER:
t1 = parse_expression(expr->node.children[0]);
if(!t1->indirect) {
result->indirect = 1;
result->op_type = t1->op_type;
result->op_val = t1->op_val;
result->var = t1->var;
} else {
int temp_reg = tr_alloc();
result->indirect = 1;
result->op_type = OP_REG;
result->op_val = temp_reg;
mir_emit(MIR_MOVE, mir_opr(t1), NULL, mir_reg(temp_reg));
}
#if 0
result->op_type = OP_REG;
result->var = t1->var;
if(is_array_type(t1->var->type_info) &&
is_history_type(t1->var->type_info)) {
result->op_val = history_array_load(t1->var, t1->op_val,
t1->op_history);
} else {
//apply_unary(&t1, TYPE_POINTER);
result->op_val = t1->op_val;
}
result->size = t1->size;
#endif
break;
case NODE_ADDRESS: {
int temp_reg;
t1 = parse_var(expr->node.children[0]);
if(is_history_type(t1->var->type_info))
temp_reg = history_address(t1);
else {
temp_reg = tr_alloc();
mir_emit(MIR_ADDR, mir_opr(t1), NULL, mir_reg(temp_reg));
}
/* Dont mark history cycles as may-aliases */
if(!is_history_type(t1->var->type_info)) {
debug_printf(1, "Marking %s as a may-alias\n", t1->var->name);
t1->var->may_alias = 1;
}
result->op_type = OP_REG;
result->op_val = temp_reg;
break;
}
case NODE_HISTORY:
t1 = parse_expression(expr->node.children[0]);
t2 = parse_expression(expr->node.children[1]);
result->op_type = OP_REG;
result->var = t1->var;
result->op_val = t1->op_val;
result->op_history = parse_expression(expr->node.children[1]);
if(is_array_type(t1->var->type_info)) {
result->op_val = history_array_load(t1->var, array_index, t2);
result->op_type = OP_REG;
} else {
result->op_val = history_load(t1->var, t2);
result->op_type = OP_REG;
}
break;
case NODE_FUNC_CALL: {
name_record_t *func;
scope_node_t *func_scope;
char *func_name;
expression_t **func_args;
int offset, num_func_args, num_history_byrefs = 0;
/* Get function name and entry */
func_name = get_name_from_node(expr->node.children[0]);
func = get_func_entry(func_name);
/* Copy arguments onto the stack */
func_scope = get_func_arg_scope(func_name);
reg = tr_alloc();
num_func_args = func->num_args;
if(num_func_args == -1)
num_func_args = expr->node.num_children - 1;
if(num_func_args)
func_args = malloc(sizeof(expression_t *) * num_func_args);
for(i = num_func_args - 1; i >= 0; i--) {
func_args[i] = parse_expression(expr->node.children[i + 1]);
#if 0
if(cflags.history_arg_setting == HISTORY_ARG_TEMP_COPY) {
if(result->var &&
is_history_type(result->var->type_info) &&
is_address_type(result->var->type_info))
num_history_byrefs++;
}
#endif
}
mcurrent = mir_emit(MIR_CALL, mir_var(func), NULL,
NULL);
for(i = 0; i < num_func_args; i++)
mir_add_arg(&mcurrent, mir_opr(func_args[i]));
result->op_val = tr_alloc();
result->op_type = OP_REG;
result->size = 0;
//free(func_args);
break;
}
case NODE_MEMBER:
result = parse_member(expr);
#if 0
/* Load the member */
if(!is_array_type(t1->var->type_info)) {
result->op_val = tr_alloc();
ic_emit(IC_LOD, t1->op_val, result->op_val, 0,
IC_REG_ADDR, IC_REG, IC_NONE);
} else
result->op_val = t1->op_val;
result->size = IC_SIZEOF_INT;
result->op_type = OP_REG;
result->var = t1->var;
#endif
break;
default:
/* Bugger. This probably won't happen */
debug_printf(1, "expr->node_type = %s\n", ast_node_name[expr->node_type]);
compiler_error(CERROR_WARN, expr->src_line_num,
"Error in expression, node type = %s\n",
ast_node_name[expr->node_type]);
break;
}
} else if(expr->node_type == NODE_LEAF_NUM) {
/* Constant value */
result->op_val = expr->leaf.val;
result->op_type = OP_CONST;
result->size = IC_SIZEOF_INT;
} else if(expr->node_type == NODE_LEAF_CHAR) {
/* Character literal */
result->op_val = expr->leaf.val;
result->op_type = OP_CONST;
result->size = IC_SIZEOF_CHAR;
} else if(expr->node_type == NODE_LEAF_STRING) {
/* String literal */
int id = expr->type_check->type_info->signature[0];
result->op_val = tr_alloc();
result->op_type = OP_REG;
result->size = IC_SIZEOF_CHAR;
mir_emit(MIR_LOAD_STRING, mir_const(id), NULL, mir_reg(result->op_val));
} else {
/* Variable */
t1 = parse_var(expr);
result->op_type = OP_VAR;
result->size = t1->size;
result->var = t1->var;
}
return result;
}
/*
* Parse a statement
*/
static void parse_statement(ast_node_t *statement) {
ic_list_t *t1, *t2, *current;
mir_node_t *mt1, *mt2, *mcurrent;
int instr, reg;
expression_t *e1, *e2, *result;
src_line_num = statement->src_line_num;
switch(statement->node.op) {
case NODE_ATOMIC:
debug_printf(1, "Entering atomic block\n");
history_enter_atomic();
parse_block(statement->node.children[statement->node.num_children - 1]);
debug_printf(1, "Leaving atomic block\n");
history_exit_atomic();
break;
case NODE_WHILE:
mt1 = mir_list_tail();
e1 = parse_expression(statement->node.children[0]);
mt2 = mir_emit(MIR_IF, mir_opr(e1), mir_const(0),
mir_const(MIR_EQL));
parse_block(statement->node.children[1]);
/* Backpatch the loop */
mcurrent = mir_emit(MIR_JUMP, NULL, NULL, NULL);
mir_set_jump(mcurrent, mt1->next);
/* Backpatch the condition */
mcurrent = mir_list_tail();
mir_set_jump(mt2, mcurrent->next);
break;
case NODE_DO:
mt1 = mir_list_tail();
parse_block(statement->node.children[1]);
e1 = parse_expression(statement->node.children[0]);
mt2 = mir_emit(MIR_IF, mir_opr(e1), mir_const(0),
mir_const(MIR_EQL));
/* Backpatch the loop */
mcurrent = mir_emit(MIR_JUMP, NULL, NULL, NULL);
mir_set_jump(mcurrent, mt1->next);
/* Backpatch the condition */
mcurrent = mir_list_tail();
mir_set_jump(mt2, mcurrent->next);
break;
case NODE_IF:
e1 = parse_expression(statement->node.children[0]);
mt1 = mir_emit(MIR_IF, mir_opr(e1), mir_const(0),
mir_const(MIR_EQL));
parse_block(statement->node.children[1]);
mt2 = mir_list_tail();
mir_set_jump(mt1, mt2->next);
break;
case NODE_FOR:
parse_statement(statement->node.children[0]);
mt1 = mir_list_tail();
e1 = parse_expression(statement->node.children[1]);
mt2 = mir_emit(MIR_IF, mir_opr(e1), mir_const(0),
mir_const(MIR_EQL));
parse_block(statement->node.children[3]);
parse_statement(statement->node.children[2]);
/* Backpatch the loop */
mcurrent = mir_emit(MIR_JUMP, NULL, NULL, NULL);
mir_set_jump(mcurrent, mt1->next);
/* Backpatch the condition */
mcurrent = mir_list_tail();
mir_set_jump(mt2, mcurrent->next);
break;
case NODE_RETURN:
e1 = parse_expression(statement->node.children[0]);
mir_emit(MIR_RETURN, mir_opr(e1), NULL, NULL);
break;
case NODE_BECOMES:
result = malloc(sizeof(expression_t));
/*
* Parse the rhs of the expression first so we know what we are storing
* before actually attempting to store it.
*/
e2 = parse_expression(statement->node.children[1]);
e1 = parse_expression(statement->node.children[0]);
#if 0
if(e1->var && is_history_type(e1->var->type_info) &&
is_array_type(e1->var->type_info) &&
history_array_type(e1->var->type_info) == HISTORY_ARRAY_WISE &&
history_in_atomic()) {
/* Add this to the pending clist writes */
history_add_clist_write(e1->var);
}
#endif
/* Check if this is a history variable */
if(e1->var && is_history_type(e1->var->type_info)) {
if(is_array_type(e1->var->type_info))
history_array_store(e1, array_index, e2);
else
history_store(e1, e2);
break;
}
/*
* MIR code generation.
* If the RHS is a single value or the LHS is a register then
* generate a move instruction
*/
if(e2->op_type == OP_VAR || e2->op_type == OP_CONST || e2->indirect ||
e1->op_type == OP_REG) {
mir_emit(MIR_MOVE, mir_opr(e2), NULL, mir_opr(e1));
} else if(e1->op_type == OP_VAR) {
/*
* Backpatch the previous instruction to assign to the variable on
* the LHS of the assignment expression
*/
debug_printf(1, "Modifying existing MIR instruction\n");
mir_node_t *instr = mir_list_tail();
instr->instruction->operand[2] = mir_opr(e1);
}
break;
case NODE_FUNC_CALL:
parse_expression(statement);
break;
default:
compiler_error(CERROR_WARN, statement->src_line_num,
"Unexpected node type in parse_statment, op=%s\n",
ast_node_name[statement->node.op]);
break;
}
}
/*
* Parse a function
*/
static void parse_func(ast_node_t *func) {
ast_node_t *name_node;
name_record_t *func_record;
type_info_t *sig;
int i, num_args;
src_line_num = func->src_line_num;
/* Get the function name */
name_node = func->node.children[0];
while(name_node->node_type == NODE_OPERATOR)
name_node = name_node->node.children[0];
debug_printf(1, "Function name = %s\n", name_node->leaf.name);
current_scope = enter_function_scope(name_node->leaf.name);
init_history_vars();
func_record = get_func_entry(name_node->leaf.name);
if(!func_record)
compiler_error(CERROR_WARN, name_node->src_line_num,
"Function %s undeclared\n", name_node->leaf.name);
num_args = 0;
for(i = 1; i < func->node.num_children; i++)
if(func->node.children[i]->node.op != NODE_BLOCK)
num_args++;
if(num_args < func_record->num_args)
compiler_error(CERROR_WARN, func->src_line_num,
"Function %s has fewer arguments than declaration "
"(%d < %d)\n", name_node->leaf.name, num_args,
func_record->num_args);
else if(num_args > func_record->num_args)
compiler_error(CERROR_WARN, func->src_line_num,
"Function %s has more arguments than declaration "
"(%d > %d)\n", name_node->leaf.name, num_args,
func_record->num_args);
/* Prologue */
scope_node_t *arg_scope;
mir_node_t *mn = mir_emit(MIR_LABEL, NULL, NULL, NULL);
func_record->mir_first = mn->next;
mir_label(&mn, func_record->name);
mir_emit(MIR_BEGIN, NULL, NULL, NULL);
/* Recieve args */
arg_scope = get_func_arg_scope(func_record->name);
for(i = 0; i < func_record->num_args; i++)
mir_emit(MIR_RECEIVE, NULL, NULL, mir_var(arg_scope->name_table[i]));
/* Backpatch jump if this is the entry point */
if(!strcmp(cflags.entry_point, name_node->leaf.name))
if(cflags.flags & CFLAG_OUTPUT_IC)
ic_set_jump(&entry_point_jump, func_record->ic_offset->next);
/* Body */
parse_block(func->node.children[num_args + 1]);
/* Epilogue */
current_scope = global_scope;
if(cflags.flags & CFLAG_OUTPUT_IC)
ic_emit(IC_RET, 0, 0, 0, IC_NONE, IC_NONE, IC_NONE);
if(cflags.flags & CFLAG_OUTPUT_HLIC)
mir_emit(MIR_END, NULL, NULL, NULL);
func_record->mir_last = mir_list_tail();
}
/*
* Parse a block of statements
*/
static void parse_block(ast_node_t *block) {
int i, scope = 0;
src_line_num = block->src_line_num;
/* Allow for empty functions */
if(!block)
return;
if(block->node.scope_tag != -1) {
debug_printf(1, "Entering new scope\n");
current_scope = current_scope->children[block->node.scope_tag];
init_history_vars();
}
for(i = 0; i < block->node.num_children; i++)
if(block->node.children[i]->node.op != NODE_DECL)
parse_statement(block->node.children[i]);
debug_printf(1, "Leaving scope\n");
if(block->node.scope_tag != -1)
current_scope = current_scope->prev;
}
void parse_declarations(ast_node_t *ast) {
parse_decl_subtrees(ast);
set_scope_offsets();
current_scope = global_scope;
}
/*
* Set the global scope offset
* FIXME: This is a bit messy.
*
*/
void set_global_offset(void) {
int i, data_offset;
data_offset = string_table_size();
for(i = 0; i < global_scope->num_records; i++)
global_scope->name_table[i]->offset += data_offset;
}
/*
* Parse function declarations
*/
static void parse_decl_funcs(ast_node_t *current) {
int i;
ast_node_t *name_node;
src_line_num = current->src_line_num;
for(i = 0; i < current->node.num_children; i++) {
if(current->node.children[i]->node.op == NODE_FUNC ||
current->node.children[i]->node.op == NODE_INLINE_FUNC){