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linearize.c
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linearize.c
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/*
* Linearize - walk the statement tree (but _not_ the expressions)
* to generate a linear version of it and the basic blocks.
*
* NOTE! We're not interested in the actual sub-expressions yet,
* even though they can generate conditional branches and
* subroutine calls. That's all "local" behaviour.
*
* Copyright (C) 2004 Linus Torvalds
* Copyright (C) 2004 Christopher Li
*/
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include "parse.h"
#include "expression.h"
#include "linearize.h"
#include "flow.h"
#include "target.h"
pseudo_t linearize_statement(struct entrypoint *ep, struct statement *stmt);
pseudo_t linearize_expression(struct entrypoint *ep, struct expression *expr);
static pseudo_t add_binary_op(struct entrypoint *ep, struct symbol *ctype, int op, pseudo_t left, pseudo_t right);
static pseudo_t add_setval(struct entrypoint *ep, struct symbol *ctype, struct expression *val);
static pseudo_t linearize_one_symbol(struct entrypoint *ep, struct symbol *sym);
struct access_data;
static pseudo_t add_load(struct entrypoint *ep, struct access_data *);
static pseudo_t linearize_initializer(struct entrypoint *ep, struct expression *initializer, struct access_data *);
static pseudo_t cast_pseudo(struct entrypoint *ep, pseudo_t src, struct symbol *from, struct symbol *to);
struct pseudo void_pseudo = {};
static struct position current_pos;
ALLOCATOR(pseudo_user, "pseudo_user");
static struct instruction *alloc_instruction(int opcode, int size)
{
struct instruction * insn = __alloc_instruction(0);
insn->opcode = opcode;
insn->size = size;
insn->pos = current_pos;
return insn;
}
static inline int type_size(struct symbol *type)
{
return type ? type->bit_size > 0 ? type->bit_size : 0 : 0;
}
static struct instruction *alloc_typed_instruction(int opcode, struct symbol *type)
{
struct instruction *insn = alloc_instruction(opcode, type_size(type));
insn->type = type;
return insn;
}
static struct entrypoint *alloc_entrypoint(void)
{
return __alloc_entrypoint(0);
}
static struct basic_block *alloc_basic_block(struct entrypoint *ep, struct position pos)
{
static int nr;
struct basic_block *bb = __alloc_basic_block(0);
bb->context = -1;
bb->pos = pos;
bb->ep = ep;
bb->nr = nr++;
return bb;
}
static struct multijmp *alloc_multijmp(struct basic_block *target, int begin, int end)
{
struct multijmp *multijmp = __alloc_multijmp(0);
multijmp->target = target;
multijmp->begin = begin;
multijmp->end = end;
return multijmp;
}
static inline int regno(pseudo_t n)
{
int retval = -1;
if (n && n->type == PSEUDO_REG)
retval = n->nr;
return retval;
}
const char *show_pseudo(pseudo_t pseudo)
{
static int n;
static char buffer[4][64];
char *buf;
int i;
if (!pseudo)
return "no pseudo";
if (pseudo == VOID)
return "VOID";
buf = buffer[3 & ++n];
switch(pseudo->type) {
case PSEUDO_SYM: {
struct symbol *sym = pseudo->sym;
struct expression *expr;
if (sym->bb_target) {
snprintf(buf, 64, ".L%u", sym->bb_target->nr);
break;
}
if (sym->ident) {
snprintf(buf, 64, "%s", show_ident(sym->ident));
break;
}
expr = sym->initializer;
snprintf(buf, 64, "<anon symbol:%p>", sym);
if (expr) {
switch (expr->type) {
case EXPR_VALUE:
snprintf(buf, 64, "<symbol value: %lld>", expr->value);
break;
case EXPR_STRING:
return show_string(expr->string);
default:
break;
}
}
break;
}
case PSEUDO_REG:
i = snprintf(buf, 64, "%%r%d", pseudo->nr);
if (pseudo->ident)
sprintf(buf+i, "(%s)", show_ident(pseudo->ident));
break;
case PSEUDO_VAL: {
long long value = pseudo->value;
if (value > 1000 || value < -1000)
snprintf(buf, 64, "$%#llx", value);
else
snprintf(buf, 64, "$%lld", value);
break;
}
case PSEUDO_ARG:
snprintf(buf, 64, "%%arg%d", pseudo->nr);
break;
case PSEUDO_PHI:
i = snprintf(buf, 64, "%%phi%d", pseudo->nr);
if (pseudo->ident)
sprintf(buf+i, "(%s)", show_ident(pseudo->ident));
break;
default:
snprintf(buf, 64, "<bad pseudo type %d>", pseudo->type);
}
return buf;
}
static const char *opcodes[] = {
[OP_BADOP] = "bad_op",
/* Fn entrypoint */
[OP_ENTRY] = "<entry-point>",
/* Terminator */
[OP_RET] = "ret",
[OP_BR] = "br",
[OP_CBR] = "cbr",
[OP_SWITCH] = "switch",
[OP_INVOKE] = "invoke",
[OP_COMPUTEDGOTO] = "jmp *",
[OP_UNWIND] = "unwind",
/* Binary */
[OP_ADD] = "add",
[OP_SUB] = "sub",
[OP_MULU] = "mulu",
[OP_MULS] = "muls",
[OP_DIVU] = "divu",
[OP_DIVS] = "divs",
[OP_MODU] = "modu",
[OP_MODS] = "mods",
[OP_SHL] = "shl",
[OP_LSR] = "lsr",
[OP_ASR] = "asr",
/* Logical */
[OP_AND] = "and",
[OP_OR] = "or",
[OP_XOR] = "xor",
[OP_AND_BOOL] = "and-bool",
[OP_OR_BOOL] = "or-bool",
/* Binary comparison */
[OP_SET_EQ] = "seteq",
[OP_SET_NE] = "setne",
[OP_SET_LE] = "setle",
[OP_SET_GE] = "setge",
[OP_SET_LT] = "setlt",
[OP_SET_GT] = "setgt",
[OP_SET_B] = "setb",
[OP_SET_A] = "seta",
[OP_SET_BE] = "setbe",
[OP_SET_AE] = "setae",
/* Uni */
[OP_NOT] = "not",
[OP_NEG] = "neg",
/* Special three-input */
[OP_SEL] = "select",
/* Memory */
[OP_MALLOC] = "malloc",
[OP_FREE] = "free",
[OP_ALLOCA] = "alloca",
[OP_LOAD] = "load",
[OP_STORE] = "store",
[OP_SETVAL] = "set",
[OP_SYMADDR] = "symaddr",
[OP_GET_ELEMENT_PTR] = "getelem",
/* Other */
[OP_PHI] = "phi",
[OP_PHISOURCE] = "phisrc",
[OP_CAST] = "cast",
[OP_SCAST] = "scast",
[OP_FPCAST] = "fpcast",
[OP_PTRCAST] = "ptrcast",
[OP_INLINED_CALL] = "# call",
[OP_CALL] = "call",
[OP_VANEXT] = "va_next",
[OP_VAARG] = "va_arg",
[OP_SLICE] = "slice",
[OP_SNOP] = "snop",
[OP_LNOP] = "lnop",
[OP_NOP] = "nop",
[OP_DEATHNOTE] = "dead",
[OP_ASM] = "asm",
/* Sparse tagging (line numbers, context, whatever) */
[OP_CONTEXT] = "context",
[OP_RANGE] = "range-check",
[OP_COPY] = "copy",
};
static char *show_asm_constraints(char *buf, const char *sep, struct asm_constraint_list *list)
{
struct asm_constraint *entry;
FOR_EACH_PTR(list, entry) {
buf += sprintf(buf, "%s\"%s\"", sep, entry->constraint);
if (entry->pseudo)
buf += sprintf(buf, " (%s)", show_pseudo(entry->pseudo));
if (entry->ident)
buf += sprintf(buf, " [%s]", show_ident(entry->ident));
sep = ", ";
} END_FOR_EACH_PTR(entry);
return buf;
}
static char *show_asm(char *buf, struct instruction *insn)
{
struct asm_rules *rules = insn->asm_rules;
buf += sprintf(buf, "\"%s\"", insn->string);
buf = show_asm_constraints(buf, "\n\t\tout: ", rules->outputs);
buf = show_asm_constraints(buf, "\n\t\tin: ", rules->inputs);
buf = show_asm_constraints(buf, "\n\t\tclobber: ", rules->clobbers);
return buf;
}
const char *show_instruction(struct instruction *insn)
{
int opcode = insn->opcode;
static char buffer[4096];
char *buf;
buf = buffer;
if (!insn->bb)
buf += sprintf(buf, "# ");
if (opcode < ARRAY_SIZE(opcodes)) {
const char *op = opcodes[opcode];
if (!op)
buf += sprintf(buf, "opcode:%d", opcode);
else
buf += sprintf(buf, "%s", op);
if (insn->size)
buf += sprintf(buf, ".%d", insn->size);
memset(buf, ' ', 20);
buf++;
}
if (buf < buffer + 12)
buf = buffer + 12;
switch (opcode) {
case OP_RET:
if (insn->src && insn->src != VOID)
buf += sprintf(buf, "%s", show_pseudo(insn->src));
break;
case OP_CBR:
buf += sprintf(buf, "%s, .L%u, .L%u", show_pseudo(insn->cond), insn->bb_true->nr, insn->bb_false->nr);
break;
case OP_BR:
buf += sprintf(buf, ".L%u", insn->bb_true->nr);
break;
case OP_SYMADDR: {
struct symbol *sym = insn->symbol->sym;
buf += sprintf(buf, "%s <- ", show_pseudo(insn->target));
if (!insn->bb && !sym)
break;
if (sym->bb_target) {
buf += sprintf(buf, ".L%u", sym->bb_target->nr);
break;
}
if (sym->ident) {
buf += sprintf(buf, "%s", show_ident(sym->ident));
break;
}
buf += sprintf(buf, "<anon symbol:%p>", sym);
break;
}
case OP_SETVAL: {
struct expression *expr = insn->val;
struct symbol *sym;
buf += sprintf(buf, "%s <- ", show_pseudo(insn->target));
if (!expr) {
buf += sprintf(buf, "%s", "<none>");
break;
}
switch (expr->type) {
case EXPR_VALUE:
buf += sprintf(buf, "%lld", expr->value);
break;
case EXPR_FVALUE:
buf += sprintf(buf, "%Lf", expr->fvalue);
break;
case EXPR_STRING:
buf += sprintf(buf, "%.40s", show_string(expr->string));
break;
case EXPR_SYMBOL:
buf += sprintf(buf, "%s", show_ident(expr->symbol->ident));
break;
case EXPR_LABEL:
sym = expr->symbol;
if (sym->bb_target)
buf += sprintf(buf, ".L%u", sym->bb_target->nr);
break;
default:
buf += sprintf(buf, "SETVAL EXPR TYPE %d", expr->type);
}
break;
}
case OP_SWITCH: {
struct multijmp *jmp;
buf += sprintf(buf, "%s", show_pseudo(insn->cond));
FOR_EACH_PTR(insn->multijmp_list, jmp) {
if (jmp->begin == jmp->end)
buf += sprintf(buf, ", %d -> .L%u", jmp->begin, jmp->target->nr);
else if (jmp->begin < jmp->end)
buf += sprintf(buf, ", %d ... %d -> .L%u", jmp->begin, jmp->end, jmp->target->nr);
else
buf += sprintf(buf, ", default -> .L%u", jmp->target->nr);
} END_FOR_EACH_PTR(jmp);
break;
}
case OP_COMPUTEDGOTO: {
struct multijmp *jmp;
buf += sprintf(buf, "%s", show_pseudo(insn->target));
FOR_EACH_PTR(insn->multijmp_list, jmp) {
buf += sprintf(buf, ", .L%u", jmp->target->nr);
} END_FOR_EACH_PTR(jmp);
break;
}
case OP_PHISOURCE: {
struct instruction *phi;
buf += sprintf(buf, "%s <- %s ", show_pseudo(insn->target), show_pseudo(insn->phi_src));
FOR_EACH_PTR(insn->phi_users, phi) {
buf += sprintf(buf, " (%s)", show_pseudo(phi->target));
} END_FOR_EACH_PTR(phi);
break;
}
case OP_PHI: {
pseudo_t phi;
const char *s = " <-";
buf += sprintf(buf, "%s", show_pseudo(insn->target));
FOR_EACH_PTR(insn->phi_list, phi) {
buf += sprintf(buf, "%s %s", s, show_pseudo(phi));
s = ",";
} END_FOR_EACH_PTR(phi);
break;
}
case OP_LOAD: case OP_LNOP:
buf += sprintf(buf, "%s <- %d[%s]", show_pseudo(insn->target), insn->offset, show_pseudo(insn->src));
break;
case OP_STORE: case OP_SNOP:
buf += sprintf(buf, "%s -> %d[%s]", show_pseudo(insn->target), insn->offset, show_pseudo(insn->src));
break;
case OP_INLINED_CALL:
case OP_CALL: {
struct pseudo *arg;
if (insn->target && insn->target != VOID)
buf += sprintf(buf, "%s <- ", show_pseudo(insn->target));
buf += sprintf(buf, "%s", show_pseudo(insn->func));
FOR_EACH_PTR(insn->arguments, arg) {
buf += sprintf(buf, ", %s", show_pseudo(arg));
} END_FOR_EACH_PTR(arg);
break;
}
case OP_CAST:
case OP_SCAST:
case OP_FPCAST:
case OP_PTRCAST:
buf += sprintf(buf, "%s <- (%d) %s",
show_pseudo(insn->target),
type_size(insn->orig_type),
show_pseudo(insn->src));
break;
case OP_BINARY ... OP_BINARY_END:
case OP_BINCMP ... OP_BINCMP_END:
buf += sprintf(buf, "%s <- %s, %s", show_pseudo(insn->target), show_pseudo(insn->src1), show_pseudo(insn->src2));
break;
case OP_SEL:
buf += sprintf(buf, "%s <- %s, %s, %s", show_pseudo(insn->target),
show_pseudo(insn->src1), show_pseudo(insn->src2), show_pseudo(insn->src3));
break;
case OP_SLICE:
buf += sprintf(buf, "%s <- %s, %d, %d", show_pseudo(insn->target), show_pseudo(insn->base), insn->from, insn->len);
break;
case OP_NOT: case OP_NEG:
buf += sprintf(buf, "%s <- %s", show_pseudo(insn->target), show_pseudo(insn->src1));
break;
case OP_CONTEXT:
buf += sprintf(buf, "%s%d", insn->check ? "check: " : "", insn->increment);
break;
case OP_RANGE:
buf += sprintf(buf, "%s between %s..%s", show_pseudo(insn->src1), show_pseudo(insn->src2), show_pseudo(insn->src3));
break;
case OP_NOP:
buf += sprintf(buf, "%s <- %s", show_pseudo(insn->target), show_pseudo(insn->src1));
break;
case OP_DEATHNOTE:
buf += sprintf(buf, "%s", show_pseudo(insn->target));
break;
case OP_ASM:
buf = show_asm(buf, insn);
break;
case OP_COPY:
buf += sprintf(buf, "%s <- %s", show_pseudo(insn->target), show_pseudo(insn->src));
break;
default:
break;
}
if (buf >= buffer + sizeof(buffer))
die("instruction buffer overflowed %td\n", buf - buffer);
do { --buf; } while (*buf == ' ');
*++buf = 0;
return buffer;
}
void show_bb(struct basic_block *bb)
{
struct instruction *insn;
printf(".L%u:\n", bb->nr);
if (verbose) {
pseudo_t needs, defines;
printf("%s:%d\n", stream_name(bb->pos.stream), bb->pos.line);
FOR_EACH_PTR(bb->needs, needs) {
struct instruction *def = needs->def;
if (def->opcode != OP_PHI) {
printf(" **uses %s (from .L%u)**\n", show_pseudo(needs), def->bb->nr);
} else {
pseudo_t phi;
const char *sep = " ";
printf(" **uses %s (from", show_pseudo(needs));
FOR_EACH_PTR(def->phi_list, phi) {
if (phi == VOID)
continue;
printf("%s(%s:.L%u)", sep, show_pseudo(phi), phi->def->bb->nr);
sep = ", ";
} END_FOR_EACH_PTR(phi);
printf(")**\n");
}
} END_FOR_EACH_PTR(needs);
FOR_EACH_PTR(bb->defines, defines) {
printf(" **defines %s **\n", show_pseudo(defines));
} END_FOR_EACH_PTR(defines);
if (bb->parents) {
struct basic_block *from;
FOR_EACH_PTR(bb->parents, from) {
printf(" **from .L%u (%s:%d:%d)**\n", from->nr,
stream_name(from->pos.stream), from->pos.line, from->pos.pos);
} END_FOR_EACH_PTR(from);
}
if (bb->children) {
struct basic_block *to;
FOR_EACH_PTR(bb->children, to) {
printf(" **to .L%u (%s:%d:%d)**\n", to->nr,
stream_name(to->pos.stream), to->pos.line, to->pos.pos);
} END_FOR_EACH_PTR(to);
}
}
FOR_EACH_PTR(bb->insns, insn) {
if (!insn->bb && verbose < 2)
continue;
printf("\t%s\n", show_instruction(insn));
} END_FOR_EACH_PTR(insn);
if (!bb_terminated(bb))
printf("\tEND\n");
}
static void show_symbol_usage(pseudo_t pseudo)
{
struct pseudo_user *pu;
if (pseudo) {
FOR_EACH_PTR(pseudo->users, pu) {
printf("\t%s\n", show_instruction(pu->insn));
} END_FOR_EACH_PTR(pu);
}
}
void show_entry(struct entrypoint *ep)
{
struct symbol *sym;
struct basic_block *bb;
printf("%s:\n", show_ident(ep->name->ident));
if (verbose) {
printf("ep %p: %s\n", ep, show_ident(ep->name->ident));
FOR_EACH_PTR(ep->syms, sym) {
if (!sym->pseudo)
continue;
if (!sym->pseudo->users)
continue;
printf(" sym: %p %s\n", sym, show_ident(sym->ident));
if (sym->ctype.modifiers & (MOD_EXTERN | MOD_STATIC | MOD_ADDRESSABLE))
printf("\texternal visibility\n");
show_symbol_usage(sym->pseudo);
} END_FOR_EACH_PTR(sym);
printf("\n");
}
FOR_EACH_PTR(ep->bbs, bb) {
if (!bb)
continue;
if (!bb->parents && !bb->children && !bb->insns && verbose < 2)
continue;
show_bb(bb);
printf("\n");
} END_FOR_EACH_PTR(bb);
printf("\n");
}
static void bind_label(struct symbol *label, struct basic_block *bb, struct position pos)
{
if (label->bb_target)
warning(pos, "label '%s' already bound", show_ident(label->ident));
label->bb_target = bb;
}
static struct basic_block * get_bound_block(struct entrypoint *ep, struct symbol *label)
{
struct basic_block *bb = label->bb_target;
if (!bb) {
bb = alloc_basic_block(ep, label->pos);
label->bb_target = bb;
}
return bb;
}
static void finish_block(struct entrypoint *ep)
{
struct basic_block *src = ep->active;
if (bb_reachable(src))
ep->active = NULL;
}
static void add_goto(struct entrypoint *ep, struct basic_block *dst)
{
struct basic_block *src = ep->active;
if (bb_reachable(src)) {
struct instruction *br = alloc_instruction(OP_BR, 0);
br->bb_true = dst;
add_bb(&dst->parents, src);
add_bb(&src->children, dst);
br->bb = src;
add_instruction(&src->insns, br);
ep->active = NULL;
}
}
static void add_one_insn(struct entrypoint *ep, struct instruction *insn)
{
struct basic_block *bb = ep->active;
if (bb_reachable(bb)) {
insn->bb = bb;
add_instruction(&bb->insns, insn);
}
}
static void set_activeblock(struct entrypoint *ep, struct basic_block *bb)
{
if (!bb_terminated(ep->active))
add_goto(ep, bb);
ep->active = bb;
if (bb_reachable(bb))
add_bb(&ep->bbs, bb);
}
static void remove_parent(struct basic_block *child, struct basic_block *parent)
{
remove_bb_from_list(&child->parents, parent, 1);
if (!child->parents)
repeat_phase |= REPEAT_CFG_CLEANUP;
}
/* Change a "switch" or a conditional branch into a branch */
void insert_branch(struct basic_block *bb, struct instruction *jmp, struct basic_block *target)
{
struct instruction *br, *old;
struct basic_block *child;
/* Remove the switch */
old = delete_last_instruction(&bb->insns);
assert(old == jmp);
kill_instruction(old);
br = alloc_instruction(OP_BR, 0);
br->bb = bb;
br->bb_true = target;
add_instruction(&bb->insns, br);
FOR_EACH_PTR(bb->children, child) {
if (child == target) {
target = NULL; /* Trigger just once */
continue;
}
DELETE_CURRENT_PTR(child);
remove_parent(child, bb);
} END_FOR_EACH_PTR(child);
PACK_PTR_LIST(&bb->children);
}
void insert_select(struct basic_block *bb, struct instruction *br, struct instruction *phi_node, pseudo_t if_true, pseudo_t if_false)
{
pseudo_t target;
struct instruction *select;
/* Remove the 'br' */
delete_last_instruction(&bb->insns);
select = alloc_instruction(OP_SEL, phi_node->size);
select->bb = bb;
assert(br->cond);
use_pseudo(select, br->cond, &select->src1);
target = phi_node->target;
assert(target->def == phi_node);
select->target = target;
target->def = select;
use_pseudo(select, if_true, &select->src2);
use_pseudo(select, if_false, &select->src3);
add_instruction(&bb->insns, select);
add_instruction(&bb->insns, br);
}
static inline int bb_empty(struct basic_block *bb)
{
return !bb->insns;
}
/* Add a label to the currently active block, return new active block */
static struct basic_block * add_label(struct entrypoint *ep, struct symbol *label)
{
struct basic_block *bb = label->bb_target;
if (bb) {
set_activeblock(ep, bb);
return bb;
}
bb = ep->active;
if (!bb_reachable(bb) || !bb_empty(bb)) {
bb = alloc_basic_block(ep, label->pos);
set_activeblock(ep, bb);
}
label->bb_target = bb;
return bb;
}
static void add_branch(struct entrypoint *ep, struct expression *expr, pseudo_t cond, struct basic_block *bb_true, struct basic_block *bb_false)
{
struct basic_block *bb = ep->active;
struct instruction *br;
if (bb_reachable(bb)) {
br = alloc_instruction(OP_CBR, 0);
use_pseudo(br, cond, &br->cond);
br->bb_true = bb_true;
br->bb_false = bb_false;
add_bb(&bb_true->parents, bb);
add_bb(&bb_false->parents, bb);
add_bb(&bb->children, bb_true);
add_bb(&bb->children, bb_false);
add_one_insn(ep, br);
}
}
/* Dummy pseudo allocator */
pseudo_t alloc_pseudo(struct instruction *def)
{
static int nr = 0;
struct pseudo * pseudo = __alloc_pseudo(0);
pseudo->type = PSEUDO_REG;
pseudo->nr = ++nr;
pseudo->def = def;
return pseudo;
}
static void clear_symbol_pseudos(struct entrypoint *ep)
{
pseudo_t pseudo;
FOR_EACH_PTR(ep->accesses, pseudo) {
pseudo->sym->pseudo = NULL;
} END_FOR_EACH_PTR(pseudo);
}
static pseudo_t symbol_pseudo(struct entrypoint *ep, struct symbol *sym)
{
pseudo_t pseudo;
if (!sym)
return VOID;
pseudo = sym->pseudo;
if (!pseudo) {
pseudo = __alloc_pseudo(0);
pseudo->nr = -1;
pseudo->type = PSEUDO_SYM;
pseudo->sym = sym;
pseudo->ident = sym->ident;
sym->pseudo = pseudo;
add_pseudo(&ep->accesses, pseudo);
}
/* Symbol pseudos have neither nr, usage nor def */
return pseudo;
}
pseudo_t value_pseudo(long long val)
{
#define MAX_VAL_HASH 64
static struct pseudo_list *prev[MAX_VAL_HASH];
int hash = val & (MAX_VAL_HASH-1);
struct pseudo_list **list = prev + hash;
pseudo_t pseudo;
FOR_EACH_PTR(*list, pseudo) {
if (pseudo->value == val)
return pseudo;
} END_FOR_EACH_PTR(pseudo);
pseudo = __alloc_pseudo(0);
pseudo->type = PSEUDO_VAL;
pseudo->value = val;
add_pseudo(list, pseudo);
/* Value pseudos have neither nr, usage nor def */
return pseudo;
}
static pseudo_t argument_pseudo(struct entrypoint *ep, int nr)
{
pseudo_t pseudo = __alloc_pseudo(0);
struct instruction *entry = ep->entry;
pseudo->type = PSEUDO_ARG;
pseudo->nr = nr;
pseudo->def = entry;
add_pseudo(&entry->arg_list, pseudo);
/* Argument pseudos have neither usage nor def */
return pseudo;
}
pseudo_t alloc_phi(struct basic_block *source, pseudo_t pseudo, int size)
{
struct instruction *insn;
pseudo_t phi;
static int nr = 0;
if (!source)
return VOID;
insn = alloc_instruction(OP_PHISOURCE, size);
phi = __alloc_pseudo(0);
phi->type = PSEUDO_PHI;
phi->nr = ++nr;
phi->def = insn;
use_pseudo(insn, pseudo, &insn->phi_src);
insn->bb = source;
insn->target = phi;
add_instruction(&source->insns, insn);
return phi;
}
/*
* We carry the "access_data" structure around for any accesses,
* which simplifies things a lot. It contains all the access
* information in one place.
*/
struct access_data {
struct symbol *result_type; // result ctype
struct symbol *source_type; // source ctype
pseudo_t address; // pseudo containing address ..
unsigned int offset; // byte offset
struct position pos;
};
static void finish_address_gen(struct entrypoint *ep, struct access_data *ad)
{
}
static int linearize_simple_address(struct entrypoint *ep,
struct expression *addr,
struct access_data *ad)
{
if (addr->type == EXPR_SYMBOL) {
linearize_one_symbol(ep, addr->symbol);
ad->address = symbol_pseudo(ep, addr->symbol);
return 1;
}
if (addr->type == EXPR_BINOP) {
if (addr->right->type == EXPR_VALUE) {
if (addr->op == '+') {
ad->offset += get_expression_value(addr->right);
return linearize_simple_address(ep, addr->left, ad);
}
}
}
ad->address = linearize_expression(ep, addr);
return 1;
}
static struct symbol *base_type(struct symbol *sym)
{
struct symbol *base = sym;
if (sym) {
if (sym->type == SYM_NODE)
base = base->ctype.base_type;
if (base->type == SYM_BITFIELD)
return base->ctype.base_type;
}
return sym;
}
static int linearize_address_gen(struct entrypoint *ep,
struct expression *expr,
struct access_data *ad)
{
struct symbol *ctype = expr->ctype;
if (!ctype)
return 0;
ad->pos = expr->pos;
ad->result_type = ctype;
ad->source_type = base_type(ctype);
if (expr->type == EXPR_PREOP && expr->op == '*')
return linearize_simple_address(ep, expr->unop, ad);
warning(expr->pos, "generating address of non-lvalue (%d)", expr->type);
return 0;
}
static pseudo_t add_load(struct entrypoint *ep, struct access_data *ad)
{
struct instruction *insn;
pseudo_t new;
insn = alloc_typed_instruction(OP_LOAD, ad->source_type);
new = alloc_pseudo(insn);
insn->target = new;
insn->offset = ad->offset;
use_pseudo(insn, ad->address, &insn->src);
add_one_insn(ep, insn);
return new;
}
static void add_store(struct entrypoint *ep, struct access_data *ad, pseudo_t value)
{
struct basic_block *bb = ep->active;
if (bb_reachable(bb)) {
struct instruction *store = alloc_typed_instruction(OP_STORE, ad->source_type);
store->offset = ad->offset;
use_pseudo(store, value, &store->target);
use_pseudo(store, ad->address, &store->src);
add_one_insn(ep, store);
}
}
static pseudo_t linearize_store_gen(struct entrypoint *ep,
pseudo_t value,
struct access_data *ad)
{
pseudo_t store = value;
if (type_size(ad->source_type) != type_size(ad->result_type)) {
struct symbol *ctype = ad->result_type;
unsigned int shift = ctype->bit_offset;
unsigned int size = ctype->bit_size;
pseudo_t orig = add_load(ep, ad);
unsigned long long mask = (1ULL << size) - 1;
if (shift) {
store = add_binary_op(ep, ad->source_type, OP_SHL, value, value_pseudo(shift));
mask <<= shift;
}
orig = add_binary_op(ep, ad->source_type, OP_AND, orig, value_pseudo(~mask));
store = add_binary_op(ep, ad->source_type, OP_OR, orig, store);
}
add_store(ep, ad, store);
return value;
}
static pseudo_t add_binary_op(struct entrypoint *ep, struct symbol *ctype, int op, pseudo_t left, pseudo_t right)
{
struct instruction *insn = alloc_typed_instruction(op, ctype);
pseudo_t target = alloc_pseudo(insn);
insn->target = target;
use_pseudo(insn, left, &insn->src1);
use_pseudo(insn, right, &insn->src2);
add_one_insn(ep, insn);
return target;
}
static pseudo_t add_setval(struct entrypoint *ep, struct symbol *ctype, struct expression *val)
{
struct instruction *insn = alloc_typed_instruction(OP_SETVAL, ctype);
pseudo_t target = alloc_pseudo(insn);
insn->target = target;
insn->val = val;
add_one_insn(ep, insn);
return target;
}
static pseudo_t add_symbol_address(struct entrypoint *ep, struct symbol *sym)
{
struct instruction *insn = alloc_instruction(OP_SYMADDR, bits_in_pointer);
pseudo_t target = alloc_pseudo(insn);
insn->target = target;
use_pseudo(insn, symbol_pseudo(ep, sym), &insn->symbol);
add_one_insn(ep, insn);
return target;
}
static pseudo_t linearize_load_gen(struct entrypoint *ep, struct access_data *ad)
{