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Implement AFREE instruction to revert ALLOCA

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This commit is contained in:
Dmitry Stogov 2022-12-07 13:09:00 +03:00
parent efbc51baaa
commit 6790ebf3b5
4 changed files with 102 additions and 5 deletions
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2
TODO
View File

@ -1,5 +1,5 @@
- va_arg nodes
- BSTART, BEND nodes (to free data allocated by ALLOCA)
? BSTART, BEND nodes (to free data allocated by ALLOCA) (now it's possible to do this through AFREE)
- Full support for function prototypes ???
(now we may only set "fastcall" calling convention for constants or for variables through BITCAST)

1
ir.h
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@ -236,6 +236,7 @@ typedef enum _ir_type {
\
/* memory reference and load/store ops */ \
_(ALLOCA, a2, src, def, ___) /* alloca(def) */ \
_(AFREE, a2, src, def, ___) /* revert alloca(def) */ \
_(VADDR, d1, var, ___, ___) /* load address of local var */ \
_(VLOAD, l2, src, var, ___) /* load value of local var */ \
_(VSTORE, s3, src, var, def) /* store value to local var */ \

52
ir_aarch64.dasc
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@ -766,8 +766,9 @@ binop_fp:
}
break;
case IR_ALLOCA:
IR_ASSERT(ctx->flags & IR_FUNCTION);
ctx->flags |= IR_USE_FRAME_POINTER | IR_HAS_ALLOCA;
if (ctx->flags & IR_FUNCTION) {
ctx->flags |= IR_USE_FRAME_POINTER | IR_HAS_ALLOCA;
}
return IR_ALLOCA;
case IR_LOAD:
ir_match_fuse_addr(ctx, insn->op2, insn->type);
@ -3172,11 +3173,15 @@ static void ir_emit_alloca(ir_ctx *ctx, ir_ref def, ir_insn *insn)
size = IR_ALIGNED_SIZE(size, 8);
}
| sub sp, sp, #size
if (!(ctx->flags & IR_FUNCTION)) {
data->call_stack_size += size;
}
} else {
int32_t alignment = (ctx->flags & IR_HAS_CALLS) ? 16 : 8;
ir_reg op2_reg = ctx->regs[def][2];
ir_type type = ctx->ir_base[insn->op2].type;
IR_ASSERT(ctx->flags & IR_FUNCTION);
IR_ASSERT(def_reg != IR_REG_NONE && op2_reg != IR_REG_NONE);
if (op2_reg & IR_REG_SPILL_LOAD) {
op2_reg &= ~IR_REG_SPILL_LOAD;
@ -3196,6 +3201,46 @@ static void ir_emit_alloca(ir_ctx *ctx, ir_ref def, ir_insn *insn)
}
}
static void ir_emit_afree(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
ir_backend_data *data = ctx->data;
dasm_State **Dst = &data->dasm_state;
if (IR_IS_CONST_REF(insn->op2)) {
ir_insn *val = &ctx->ir_base[insn->op2];
int32_t size = val->val.i32;
IR_ASSERT(IR_IS_TYPE_INT(val->type));
IR_ASSERT(IR_IS_TYPE_UNSIGNED(val->type) || val->val.i64 > 0);
if (ctx->flags & IR_HAS_CALLS) {
/* Stack must be 16 byte aligned */
size = IR_ALIGNED_SIZE(size, 16);
} else {
size = IR_ALIGNED_SIZE(size, 8);
}
| add sp, sp, #size
if (!(ctx->flags & IR_FUNCTION)) {
data->call_stack_size -= size;
}
} else {
// int32_t alignment = (ctx->flags & IR_HAS_CALLS) ? 16 : 8;
ir_reg op2_reg = ctx->regs[def][2];
ir_type type = ctx->ir_base[insn->op2].type;
IR_ASSERT(ctx->flags & IR_FUNCTION);
IR_ASSERT(op2_reg != IR_REG_NONE);
if (op2_reg & IR_REG_SPILL_LOAD) {
op2_reg &= ~IR_REG_SPILL_LOAD;
ir_emit_load(ctx, type, op2_reg, insn->op2);
}
// TODO: alignment
| add sp, sp, Rx(op2_reg);
}
}
static void ir_emit_switch(ir_ctx *ctx, uint32_t b, ir_ref def, ir_insn *insn)
{
ir_backend_data *data = ctx->data;
@ -4987,6 +5032,9 @@ void *ir_emit_code(ir_ctx *ctx, size_t *size_ptr)
case IR_ALLOCA:
ir_emit_alloca(ctx, i, insn);
break;
case IR_AFREE:
ir_emit_afree(ctx, i, insn);
break;
case IR_EXITCALL:
ir_emit_exitcall(ctx, i, insn);
break;

52
ir_x86.dasc
View File

@ -1344,8 +1344,9 @@ binop_fp:
break;
case IR_ALLOCA:
/* alloca() may be use only in functions */
IR_ASSERT(ctx->flags & IR_FUNCTION);
ctx->flags |= IR_USE_FRAME_POINTER | IR_HAS_ALLOCA;
if (ctx->flags & IR_FUNCTION) {
ctx->flags |= IR_USE_FRAME_POINTER | IR_HAS_ALLOCA;
}
return IR_ALLOCA;
case IR_VSTORE:
if (IR_IS_TYPE_INT(ctx->ir_base[insn->op3].type)) {
@ -5252,11 +5253,15 @@ static void ir_emit_alloca(ir_ctx *ctx, ir_ref def, ir_insn *insn)
size = IR_ALIGNED_SIZE(size, 8);
}
| ASM_REG_IMM_OP sub, IR_ADDR, IR_REG_RSP, size
if (!(ctx->flags & IR_FUNCTION)) {
data->call_stack_size += size;
}
} else {
int32_t alignment = (ctx->flags & IR_HAS_CALLS) ? 16 : 8;
ir_reg op2_reg = ctx->regs[def][2];
ir_type type = ctx->ir_base[insn->op2].type;
IR_ASSERT(ctx->flags & IR_FUNCTION);
IR_ASSERT(def_reg != IR_REG_NONE);
if (op2_reg != IR_REG_NONE && (op2_reg & IR_REG_SPILL_LOAD)) {
op2_reg &= ~IR_REG_SPILL_LOAD;
@ -5284,6 +5289,46 @@ static void ir_emit_alloca(ir_ctx *ctx, ir_ref def, ir_insn *insn)
}
}
static void ir_emit_afree(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
ir_backend_data *data = ctx->data;
dasm_State **Dst = &data->dasm_state;
if (IR_IS_CONST_REF(insn->op2)) {
ir_insn *val = &ctx->ir_base[insn->op2];
int32_t size = val->val.i32;
IR_ASSERT(IR_IS_TYPE_INT(val->type));
IR_ASSERT(IR_IS_TYPE_UNSIGNED(val->type) || val->val.i64 > 0);
IR_ASSERT(IR_IS_SIGNED_32BIT(val->val.i64));
if (ctx->flags & IR_HAS_CALLS) {
/* Stack must be 16 byte aligned */
size = IR_ALIGNED_SIZE(size, 16);
} else {
size = IR_ALIGNED_SIZE(size, 8);
}
| ASM_REG_IMM_OP add, IR_ADDR, IR_REG_RSP, size
if (!(ctx->flags & IR_FUNCTION)) {
data->call_stack_size -= size;
}
} else {
// int32_t alignment = (ctx->flags & IR_HAS_CALLS) ? 16 : 8;
ir_reg op2_reg = ctx->regs[def][2];
ir_type type = ctx->ir_base[insn->op2].type;
IR_ASSERT(ctx->flags & IR_FUNCTION);
if (op2_reg != IR_REG_NONE && (op2_reg & IR_REG_SPILL_LOAD)) {
op2_reg &= ~IR_REG_SPILL_LOAD;
ir_emit_load(ctx, type, op2_reg, insn->op2);
}
// TODO: alignment ???
| ASM_REG_REG_OP add, IR_ADDR, IR_REG_RSP, op2_reg
}
}
static void ir_emit_switch(ir_ctx *ctx, uint32_t b, ir_ref def, ir_insn *insn)
{
ir_backend_data *data = ctx->data;
@ -7858,6 +7903,9 @@ void *ir_emit_code(ir_ctx *ctx, size_t *size_ptr)
case IR_ALLOCA:
ir_emit_alloca(ctx, i, insn);
break;
case IR_AFREE:
ir_emit_afree(ctx, i, insn);
break;
case IR_EXITCALL:
ir_emit_exitcall(ctx, i, insn);
break;