http://llvm.org/bugs/show_bug.cgi?id=3612
Summary: printf(printf); leads to invalid codegen and no
diagnosis
Product: clang
Version: unspecified
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: LLVM Codegen
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
This is a new bug. It used to generated expected results a week ago
(diagnostics and expected code gen).
Compiling the following code:
#include <stdio.h>
int foo(void) {
return printf(printf);
}
Results in the following codegen'd function (and no diagnostics from clang!):
define i32 @__ccons_anon1() nounwind {
entry:
%retval = alloca i32 ; <i32*> [#uses=2]
%call = call i32 (i8*, ...)* @printf(i8* bitcast (i32 (i8*, ...)*
@printf1 to i8*)) ; <i32> [#uses=1]
store i32 %call, i32* %retval
%0 = load i32* %retval ; <i32> [#uses=1]
ret i32 %0
}
When this function is then attempted to be executed with llvm, it results in
the following assert:
ERROR: Program used external function 'printf1' which could not be resolved!
The expected behaviour (which used to be the case 1 week ago or so) is:
First of all, diagnostics produced due to incorrect pointer type being passed.
Second of all, the calling of foo() succeeding and printf treating a pointer to
itself as a string and printing some garbage (until it encounters a zero).
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