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Mark comptime int hardcoded address pointee as a run time variable #1171 (#1868)

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* Mark comptime int hardcoded address as a run time variable #1171

* test case for dereferencing hardcoded address intToPtr
This commit is contained in:
vegecode 2019-01-04 16:34:21 -06:00 committed by Andrew Kelley
parent 5c2a1055a0
commit 1f08be4d7f
2 changed files with 15 additions and 0 deletions
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1
src/ir.cpp
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@ -20363,6 +20363,7 @@ static IrInstruction *ir_analyze_instruction_int_to_ptr(IrAnalyze *ira, IrInstru
IrInstruction *result = ir_const(ira, &instruction->base, dest_type);
result->value.data.x_ptr.special = ConstPtrSpecialHardCodedAddr;
result->value.data.x_ptr.mut = ConstPtrMutRuntimeVar;
result->value.data.x_ptr.data.hard_coded_addr.addr = bigint_as_unsigned(&val->data.x_bigint);
return result;
}

14
test/cases/inttoptr.zig
View File

@ -11,3 +11,17 @@ fn randomAddressToFunction() void {
var addr: usize = 0xdeadbeef;
var ptr = @intToPtr(fn () void, addr);
}
test "mutate through ptr initialized with constant intToPtr value" {
forceCompilerAnalyzeBranchHardCodedPtrDereference(false);
}
fn forceCompilerAnalyzeBranchHardCodedPtrDereference(x: bool) void {
const hardCodedP = @intToPtr(*volatile u8, 0xdeadbeef);
if (x) {
hardCodedP.* = hardCodedP.* | 10;
} else {
return;
}
}