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Code Issues 1 Releases Wiki Activity

Don't assign variables positions on the stack that clobber import info.

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(return address, previous basepoint, etc.)
This commit is contained in:
Calvin Rose 2024-06-16 10:06:22 -05:00
parent dfdf734fc7
commit c413bc2b4e
2 changed files with 10 additions and 13 deletions
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4
examples/sysir/samples.janet
View File

@ -19,8 +19,8 @@
(set i (the int (+ 1 i)))
(printf "i = %d\n" i))
(printf "hello, world!\n%d\n" (the int (if x abc xyz)))
(return (* abc xyz))))
#(return (the int (simple (* abc xyz))))))
#(return (* abc xyz))))
(return (the int (simple (* abc xyz))))))
(def doloop
'(defn doloop [x:int y:int]

19
src/core/sysir_x86.c
View File

@ -166,9 +166,9 @@ void assign_registers(JanetSysx64Context *ctx) {
/* TODO - linear scan or graph coloring. Require calculating live ranges */
/* TODO - avoid spills inside loops if possible i.e. not all spills are equal */
/* TODO - move into sysir.c and allow reuse for multiple targets */
/* Make trivial assigments */
uint32_t next_loc = 0;
uint32_t next_loc = 16;
ctx->regs = janet_smalloc(ctx->ir->register_count * sizeof(x64Reg));
uint32_t assigned = 0;
uint32_t occupied = 0;
@ -193,7 +193,7 @@ void assign_registers(JanetSysx64Context *ctx) {
assigned |= 1 << ctx->regs[i].index;
occupied |= 1 << ctx->regs[i].index;
}
} else if (assigned < 0xFFFF) { /* skip r15 so we have some temporary registers if needed */
} else if (assigned < 0xFFFF) {
/* Assign to register */
uint32_t to = 0;
while ((1 << to) & assigned) to++;
@ -351,7 +351,7 @@ static void sysemit_threeop(JanetSysx64Context *ctx, const char *op, uint32_t de
}
static void sysemit_threeop_nodeststack(JanetSysx64Context *ctx, const char *op, uint32_t dest, uint32_t lhs,
uint32_t rhs) {
uint32_t rhs) {
if (operand_isstack(ctx, dest)) {
sysemit_movreg(ctx, RAX, lhs);
x64Reg tempreg;
@ -487,7 +487,6 @@ void janet_sys_ir_lower_to_x64(JanetSysIRLinkage *linkage, JanetBuffer *buffer)
ctx.ir_layouts[i] = ctx.layouts[ir->types[i]];
}
ctx.ir = ir;
//janet_assert(ir->register_count, "non-zero register count");
assign_registers(&ctx);
/* Emit prelude */
@ -529,7 +528,7 @@ void janet_sys_ir_lower_to_x64(JanetSysIRLinkage *linkage, JanetBuffer *buffer)
break;
case JANET_SYSOP_MULTIPLY:
sysemit_threeop_nodeststack(&ctx, "imul", instruction.three.dest,
instruction.three.lhs, instruction.three.rhs);
instruction.three.lhs, instruction.three.rhs);
break;
case JANET_SYSOP_DIVIDE:
sysemit_three_inst(&ctx, "idiv", instruction);
@ -585,9 +584,9 @@ void janet_sys_ir_lower_to_x64(JanetSysIRLinkage *linkage, JanetBuffer *buffer)
// TODO - ensure branch condition is not a const
sysemit_operand(&ctx, instruction.branch.cond, ", 0\n");
janet_formatb(buffer,
"%s label_%d_%u\n",
instruction.opcode == JANET_SYSOP_BRANCH ? "jnz " : "jz ",
i, instruction.branch.to);
"%s label_%d_%u\n",
instruction.opcode == JANET_SYSOP_BRANCH ? "jnz " : "jz ",
i, instruction.branch.to);
break;
case JANET_SYSOP_JUMP:
janet_formatb(buffer, "jmp label_%d_%u\n", i, instruction.jump.to);
@ -631,13 +630,11 @@ void janet_sys_ir_lower_to_x64(JanetSysIRLinkage *linkage, JanetBuffer *buffer)
janet_formatb(buffer, "syscall\n");
} else {
/* Save RAX to number of floating point args for varags - for now, always 0 :) */
sysemit_pushreg(&ctx, RAX);
janet_formatb(buffer, "mov rax, 0\n");
janet_formatb(buffer, "call ");
sysemit_operand(&ctx, instruction.call.callee, "\n");
}
if (instruction.call.flags & JANET_SYS_CALLFLAG_HAS_DEST) sysemit_movreg(&ctx, RAX, instruction.call.dest);
if (instruction.opcode != JANET_SYSOP_SYSCALL) sysemit_popreg(&ctx, RAX);
if (save_r11) sysemit_popreg(&ctx, 11);
if (save_r10) sysemit_popreg(&ctx, 10);
if (save_r9) sysemit_popreg(&ctx, 9);