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Update jumptable codegen.

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This commit is contained in:
Christoffer Lerno
2025-08-26 20:34:44 +02:00
parent c17cb7d0ca
commit 1781e97f02
1 changed files with 13 additions and 8 deletions
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21
src/compiler/llvm_codegen_stmt.c
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@@ -874,16 +874,15 @@ static void llvm_emit_switch_jump_table(GenContext *c,
LLVMValueRef instr = llvm_emit_switch_jump_stmt(c, switch_ast, cases, count, min_index, jmptable, default_block, switch_value);
#define REF_STACK 16
LLVMValueRef refs_stack[REF_STACK];
LLVMValueRef *refs = refs_stack;
void *refs_stack[REF_STACK];
void **refs = refs_stack;
if (count > REF_STACK)
{
refs = MALLOC(sizeof(LLVMValueRef) * count);
refs = MALLOC(sizeof(void *) * count);
}
#undef REF_STACK
LLVMValueRef default_block_address = LLVMBlockAddress(c->cur_func.ref, default_block);
ASSERT(count < DEFAULT_SWITCH_JUMP_MAX_SIZE + 1);
memset(refs, 0, sizeof(LLVMValueRef) * count);
memset(refs, 0, sizeof(void *) * count);
for (unsigned i = 0; i < case_count; i++)
{
Ast *case_stmt = cases[i];
@@ -898,7 +897,7 @@ static void llvm_emit_switch_jump_table(GenContext *c,
uint64_t to_val = to_value.i.low;
for (uint64_t j = from_val; j <= to_val; j++)
{
refs[j] = LLVMBlockAddress(c->cur_func.ref, block);
refs[j] = block;
}
// No fallthrough
if (!case_stmt->case_stmt.body) continue;
@@ -914,13 +913,19 @@ static void llvm_emit_switch_jump_table(GenContext *c,
for (uint64_t i = 0; i < count; i++)
{
if (refs[i]) continue;
refs[i] = default_block_address;
refs[i] = default_block;
if (found) continue;
found = true;
LLVMAddDestination(instr, default_block);
}
LLVMSetInitializer(jmptable, LLVMConstArray(c->ptr_type, refs, count));
LLVMAddDestination(instr, default_block);
llvm_emit_block(c, exit_block);
for (uint64_t i = 0; i < count; i++)
{
LLVMValueRef block_address = LLVMBlockAddress(c->cur_func.ref, refs[i]);
refs[i] = block_address;
}
LLVMSetInitializer(jmptable, LLVMConstArray(c->ptr_type, (LLVMValueRef *)refs, count));
}
static void llvm_emit_switch_body(GenContext *c, BEValue *switch_value, Ast *switch_ast, bool is_typeid)