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while detects simple constant condition

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This commit is contained in:
Andrew Kelley
2016-01-06 18:02:42 -07:00
parent 5f0bfcac24
commit c75d40680f
6 changed files with 194 additions and 39 deletions
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57
src/codegen.cpp
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@@ -1157,29 +1157,52 @@ static LLVMValueRef gen_while_expr(CodeGen *g, AstNode *node) {
assert(node->data.while_expr.condition);
assert(node->data.while_expr.body);
LLVMBasicBlockRef cond_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "WhileCond");
LLVMBasicBlockRef body_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "WhileBody");
LLVMBasicBlockRef end_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "WhileEnd");
if (get_expr_type(node)->id == TypeTableEntryIdUnreachable) {
// generate a forever loop. guarantees no break statements
add_debug_source_node(g, node);
LLVMBuildBr(g->builder, cond_block);
LLVMBasicBlockRef body_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "WhileBody");
LLVMPositionBuilderAtEnd(g->builder, cond_block);
LLVMValueRef cond_val = gen_expr(g, node->data.while_expr.condition);
add_debug_source_node(g, node->data.while_expr.condition);
LLVMBuildCondBr(g->builder, cond_val, body_block, end_block);
add_debug_source_node(g, node);
LLVMBuildBr(g->builder, body_block);
LLVMPositionBuilderAtEnd(g->builder, body_block);
g->break_block_stack.append(end_block);
g->continue_block_stack.append(cond_block);
gen_expr(g, node->data.while_expr.body);
g->break_block_stack.pop();
g->continue_block_stack.pop();
if (get_expr_type(node->data.while_expr.body)->id != TypeTableEntryIdUnreachable) {
LLVMPositionBuilderAtEnd(g->builder, body_block);
g->continue_block_stack.append(body_block);
gen_expr(g, node->data.while_expr.body);
g->continue_block_stack.pop();
if (get_expr_type(node->data.while_expr.body)->id != TypeTableEntryIdUnreachable) {
add_debug_source_node(g, node);
LLVMBuildBr(g->builder, body_block);
}
} else {
// generate a normal while loop
LLVMBasicBlockRef cond_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "WhileCond");
LLVMBasicBlockRef body_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "WhileBody");
LLVMBasicBlockRef end_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "WhileEnd");
add_debug_source_node(g, node);
LLVMBuildBr(g->builder, cond_block);
LLVMPositionBuilderAtEnd(g->builder, cond_block);
LLVMValueRef cond_val = gen_expr(g, node->data.while_expr.condition);
add_debug_source_node(g, node->data.while_expr.condition);
LLVMBuildCondBr(g->builder, cond_val, body_block, end_block);
LLVMPositionBuilderAtEnd(g->builder, body_block);
g->break_block_stack.append(end_block);
g->continue_block_stack.append(cond_block);
gen_expr(g, node->data.while_expr.body);
g->break_block_stack.pop();
g->continue_block_stack.pop();
if (get_expr_type(node->data.while_expr.body)->id != TypeTableEntryIdUnreachable) {
add_debug_source_node(g, node);
LLVMBuildBr(g->builder, cond_block);
}
LLVMPositionBuilderAtEnd(g->builder, end_block);
}
LLVMPositionBuilderAtEnd(g->builder, end_block);
return nullptr;
}