From c42e809f132d91fca1f96da2ecff7d78e1085c3f Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Thu, 31 Aug 2017 16:54:20 -0400
Subject: setEvalBranchQuota must be called from top of comptime stack

---
 src/ir.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

(limited to 'src/ir.cpp')

diff --git a/src/ir.cpp b/src/ir.cpp
index f8b6c4cdf7..74a48f6f50 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -7604,13 +7604,13 @@ static bool ir_emit_backward_branch(IrAnalyze *ira, IrInstruction *source_instru
     size_t *bbc = ira->new_irb.exec->backward_branch_count;
     size_t quota = ira->new_irb.exec->backward_branch_quota;
 
-    if (ira->new_irb.exec->reported_quota_exceeded) {
+    // If we're already over quota, we've already given an error message for this.
+    if (*bbc > quota) {
         return false;
     }
 
     *bbc += 1;
     if (*bbc > quota) {
-        ira->new_irb.exec->reported_quota_exceeded = true;
         ir_add_error(ira, source_instruction, buf_sprintf("evaluation exceeded %" ZIG_PRI_usize " backwards branches", quota));
         return false;
     }
@@ -13285,6 +13285,12 @@ static TypeTableEntry *ir_analyze_instruction_type_id(IrAnalyze *ira,
 static TypeTableEntry *ir_analyze_instruction_set_eval_branch_quota(IrAnalyze *ira,
         IrInstructionSetEvalBranchQuota *instruction)
 {
+    if (ira->new_irb.exec->parent_exec != nullptr) {
+        ir_add_error(ira, &instruction->base,
+                buf_sprintf("@setEvalBranchQuota must be called from the top of the comptime stack"));
+        return ira->codegen->builtin_types.entry_invalid;
+    }
+
     uint64_t new_quota;
     if (!ir_resolve_usize(ira, instruction->new_quota->other, &new_quota))
         return ira->codegen->builtin_types.entry_invalid;
-- 
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