# $NetBSD: hacks.mk,v 1.5 2015/03/05 16:35:49 tnn Exp $

.if !defined(OPENJDK8_HACKS_MK)
OPENJDK8_HACKS_MK=	# empty

### Ensure we do not pickup external jpeg includes: openjdk uses an internal
### libjpeg with potentially conflicting defines, which breaks at least
### libjpeg-turbo
post-wrapper:
	${RM} -f ${BUILDLINK_DIR}/include/jconfig.h
	${RM} -f ${BUILDLINK_DIR}/include/jerror.h
	${RM} -f ${BUILDLINK_DIR}/include/jmorecfg.h
	${RM} -f ${BUILDLINK_DIR}/include/jpeglib.h

# Don't reserve more memory than we need.
# Fixes build in artificially VA constrained environment.
#
VA_HACK_ARGS=	-XX:ReservedCodeCacheSize=128M
VA_HACK_ARGS+=	-XX:MaxMetaspaceSize=768M
.if ${MACHINE_ARCH} == "x86_64"
VA_HACK_ARGS+=	-XX:CompressedClassSpaceSize=128M
.endif
.PHONY: apply-va-hack
apply-va-hack:
	@${STEP_MSG} "Bulk build: reducing VA usage for tools in ${ALT_BOOTDIR}"
.  for t in bin/java
	@test -f ${ALT_BOOTDIR}/${t}.real ||	\
		mv ${ALT_BOOTDIR}/${t} ${ALT_BOOTDIR}/${t}.real
	@echo '#!/bin/sh' > ${ALT_BOOTDIR}/${t}	&& \
	 echo 'exec ${ALT_BOOTDIR}/${t}.real ${VA_HACK_ARGS:M*} "$$@"' >> \
		${ALT_BOOTDIR}/${t}	&& \
	 chmod +x ${ALT_BOOTDIR}/${t}
.  endfor
.  for t in bin/jar bin/jarsigner bin/javac bin/javah bin/javap bin/keytool bin/native2ascii bin/rmic
	@test -f ${ALT_BOOTDIR}/${t}.real ||	\
		mv ${ALT_BOOTDIR}/${t} ${ALT_BOOTDIR}/${t}.real
	@echo '#!/bin/sh' > ${ALT_BOOTDIR}/${t}	&& \
	 echo 'exec ${ALT_BOOTDIR}/${t}.real ${VA_HACK_ARGS:C/^/-J/} "$$@"' >> \
		${ALT_BOOTDIR}/${t}	&& \
	 chmod +x ${ALT_BOOTDIR}/${t}
.  endfor

# Workaround incorrect constant folding of subnormals in javac when the FPU
# does not handle subnormal arithmetic, like on ARM in Flush-to-zero mode.
# These workarounds avoid underflow conditions during the bootstrap so the
# JDK can correctly build itself. Compiling or running programs other than
# openjdk itself on such hardware may still cause unexpected behaviour.
#
COMPARE_SUBNORMAL_CMD=	${AWK} 'BEGIN {print (1E-307*1E-1==0?"yes":"no");exit;}'
BROKEN_IEEE_FLOATS:=	${COMPARE_SUBNORMAL_CMD:sh}
.if !empty(BROKEN_IEEE_FLOATS:Myes)
PKG_HACKS+=		broken-ieee-floats
SUBST_CLASSES+=		fpu
SUBST_STAGE.fpu=	pre-build
SUBST_MESSAGE.fpu=	Broken FPU detected: applying floating point workarounds
SUBST_FILES.fpu=	langtools/src/share/classes/com/sun/tools/javac/jvm/Items.java
SUBST_FILES.fpu+=	langtools/src/share/classes/com/sun/tools/javac/parser/JavacParser.java
SUBST_FILES.fpu+=	jdk/src/share/classes/sun/misc/DoubleConsts.java
SUBST_FILES.fpu+=	jdk/src/share/classes/sun/misc/FloatConsts.java
SUBST_FILES.fpu+=	jdk/src/share/classes/java/lang/Double.java
SUBST_FILES.fpu+=	jdk/src/share/classes/java/lang/Float.java
# Double{,Consts}.java: Replace problematic literals with binary representation
SUBST_SED.fpu=		-e 's|2.2250738585072014e-308d*|Double.longBitsToDouble(0x10000000000000L)|ig'	# MIN_NORMAL
SUBST_SED.fpu+=		-e 's|0x1.0p-1022d*|Double.longBitsToDouble(0x10000000000000L)|ig'		# MIN_NORMAL
SUBST_SED.fpu+=		-e 's|4.9e-324d*|Double.longBitsToDouble(0x1L)|ig'				# MIN_VALUE
SUBST_SED.fpu+=		-e 's|0x0.0000000000001p-1022d*|Double.longBitsToDouble(0x1L)|ig'		# MIN_VALUE
# Float{,Consts}.java: Replace problematic literals with binary representation
SUBST_SED.fpu+=		-e 's|1.17549435e-38f*|Float.intBitsToFloat(0x800000)|ig'	# MIN_NORMAL
SUBST_SED.fpu+=		-e 's|0x1.0p-126f*|Float.intBitsToFloat(0x800000)|ig'		# MIN_NORMAL
SUBST_SED.fpu+=		-e 's|1.4e-45f*|Float.intBitsToFloat(0x1)|ig'			# MIN_VALUE
SUBST_SED.fpu+=		-e 's|0x0.000002P-126f*|Float.intBitsToFloat(0x1)|ig'		# MIN_VALUE
# JavacParser.java: avoid bogus "fp.number.too.small" error parsing literals representing Double.MIN_VALUE
SUBST_SED.fpu+=		-e 's|n.floatValue() == 0.0f && !isZero(proper)|& \&\& Float.floatToIntBits(n) != 0x1|'
SUBST_SED.fpu+=		-e 's|n.doubleValue() == 0.0d && !isZero(proper)|& \&\& Double.doubleToLongBits(n) != 0x1L|'
# Items.java: Avoid invalid constant folding of literal subnormals to positive zero
SUBST_SED.fpu+=		-e 's|x == 0.0f && 1.0f / x > 0.0f|Float.floatToIntBits(x) == 0x0|g'
SUBST_SED.fpu+=		-e 's|x == 0.0d && 1.0d / x > 0.0d|Double.doubleToLongBits(x) == 0x0L|g'
.endif

.endif