Include the ARMv7 assembler in the qmldevtools bootstrap build

Even when the C++ target is not ARMv7 we want to include it in order to
be able to generate QML cache files with code ahead of time.

This requires a few changes:

* The Jump classes need to move from the AbstractMacroAssembler
  super-class into the concrete assembler sub-class, in order to
  use it in specializations.
* Some of the template specializations in LinkBuffer for example or
  for platform dependent operations need to be pre-processor enabled
  when bootstrapping
* The generic loadPtr/addPtr etc. functions need to move to the concrete
  assemblers to be able to call the correct 32-bit or 64-bit variations.
* We need to force what looks like a loss of precision to the compiler
  in the 32-bit ARMv7 linking code when linking jumps.

Finally then we can explicitly instantiate at least QV4::JIT::Assembler
for ARMv7 when bootstrapping. Currently only on x86-64 hosts, but that
is a temporary limitation.

Change-Id: I501db2360e1fded48f17f17d9e87252d47f8537e
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/qml/jit/qv4unop.cpp b/src/qml/jit/qv4unop.cpp
index cc03fa6006..31355e5dce 100644
--- a/src/qml/jit/qv4unop.cpp
+++ b/src/qml/jit/qv4unop.cpp
@@ -145,5 +145,8 @@ void Unop<JITAssembler>::generateCompl(IR::Expr *source, IR::Expr *target)
 }
 
 template struct QV4::JIT::Unop<QV4::JIT::Assembler<DefaultAssemblerTargetConfiguration>>;
+#if defined(V4_BOOTSTRAP) && CPU(X86_64)
+template struct QV4::JIT::Unop<QV4::JIT::Assembler<AssemblerTargetConfiguration<JSC::MacroAssemblerARMv7, NoOperatingSystemSpecialization>>>;
+#endif
 
 #endif