http://bugzilla.gdcproject.org/show_bug.cgi?id=74
Bug #: 74
Summary: Wrong code generated (incorrect offset to static
array)
Classification: Unclassified
Product: GDC
Version: 4.7.x
Platform: ARM
OS/Version: Linux
Status: NEW
Severity: normal
Priority: Normal
Component: gdc
AssignedTo: ibuc...@gdcproject.org
ReportedBy: po...@pobox.sk
Created attachment 48
--> http://bugzilla.gdcproject.org/attachment.cgi?id=48
Result of: objdump -S -r test.o
Reduced example:
----------------
File colors.d:
----------------
module colors;
public class Colors {
public static void getColor(int j, ref float[4] color) {
color[0] = 0.7;
color[1] = 0.6;
color[2] = 0.5;
color[3] = 0.8;
}
}
----------------
File test.d:
----------------
module test;
private import colors;
public class Test {
public static float[2] testData2 = [2.7, 2.6];
private:
static float[4*4][2][6] testColors;
public static float[2] testData3;
public static void prepare() {
foreach (k; 0..6) {
float[4] currentColor;
Colors.getColor(k, currentColor);
testColors[k][0] = currentColor ~ currentColor ~ currentColor ~
currentColor;
Colors.getColor(k, currentColor);
testColors[k][1] = currentColor ~ currentColor ~ currentColor ~
currentColor;
}
}
public static float[2] spData = [1.7, 1.6];
}
----------------
File main.d:
----------------
module main;
private import test;
private import std.stdio;
private import std.conv;
public int main(string[] argv) {
Test.prepare();
writeln(to!string(Test.testData2[0]));
return 0;
}
----------------
When the example is executed it should print 2.7 (and exit), but when I compile
it for ARM and run it, it prints 0.7, because the value gets overwritten in the
prepare method.
I'm using a GDC crosscompiler for ARM linux (running on x64 linux) - gcc
version 4.7.3 with gdc commit e63f8a7a5657684c0f2c3d2fd1a9c33eec0208c0 (last
commit in gdc-4.7 branch before merging D 2.063).
I couldn't reproduce the error on x86 and x64.
The result of "objdump -S -r test.o" is in the attachment.
In line 26 is an instruction which loads an offset from memory - relocation:
10: e59f31dc ldr r3, [pc, #476] ; 1f4
<_D4test4Test7prepareFZv+0x1f4>
In lines 188 and 189 is the relocation:
1f4: 00000050 .word 0x00000050
1f4: R_ARM_TLS_LE32 _D4test4Test10testColorsG6G2G16f
The value in line 188 is 0x50, but it should be 0x40.
This bug appears in some specific conditions (e.g. when I add a writeln
statement into test.d, the bug disappears).
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